-
The present invention relates to a pickup. In particular, the present invention
relates to an individual-type or a combined-type noise-canceling pickup with the
orientations of its front and rear sound inlets being roughly toward the same or
perpendicular to each other.
-
When receiving voice, especially in a relatively high frequency band, it is
desirable that pickups used in both communication systems and our daily life are able to
reduce ambient noises as much as possible, while not decreasing or notably lowering
sensitivity of the pickups. Particularly, when used in high noise environment, it is more
important for the pickups to have a strong noise-canceling ability. Therefore, the main
objective of the present invention is to provide an improved pickup, which has an
excellent ability to cancel noise.
-
The technical solutions disclosed in the present application are novel
improvements over several previous patent applications commonly owned by the
present inventor. The present inventor's prior patent applications PCT/CN99/00097
(electret noise-canceling pickup), CN Utility Model Application No.98207092.6, and
CN Utility Model Application No. 99217256.X, disclosed in detail the electret
noise-canceling pickup and the whole structure and internal assembling
interrelationship of a combined noise-canceling pickup. These pickups are composed
of two portions, i.e. a main cylinder body and a rear cylinder body. As an individual
type of noise-canceling pickup, the individual-type noise-canceling pickup has such
advantages as high signal/noise ratio, as well as excellent noise-canceling ability even
in high frequency band. It is light in structure, easy to assemble. The microphone no
longer needs a shell and can be directly fixed on other external devices. However, as the
front and rear sound inlets of the individual-type electret noise-canceling pickup are
located on the front wall of the front cover and the rear wall of the rear cover of the
pickup body, one faces right to the main sound source and the other one is deviated
from the main sound source. Therefore, if the pickup is over 10 cm away from the main
sound source, the sound wave arriving at that point is close to a plane wave, thus, a
significant difference in characteristics between the two sound waves at front sound
inlet and rear sound inlet will occur, which will affect the noise canceling result, even
though the thickness of the main cylinder body has been reduced. Under certain adverse
circumstances, such as high noise environment, the individual-type noise-canceling
pickup does not show sufficient noise-canceling ability. Especially, when used for
signal input in a computer voice-identification system, the individual-type
noise-canceling pickup does not meet the needs. Hence, it is an urgent task to design a
noise-canceling pickup with an assembled structure, which has an improved ability to
cancel noises and other excellent performances even in adverse circumstances of high
noise or used for voice signal input at higher frequency band. Therefore, it is desirable
to design a pickup with a strong noise-canceling ability, in which front and rear sound
inlets face roughly the same direction or face to directions substantially perpendicular
to each other.
-
In conventional electret non-anti-noise pickups, components not for receiving
voice signal, such as an impedance conversion circuit, are directly arranged within the
cylinder body of the non-anti-noise pickup, resulting in a thick profile of the pickup. In
the noise-canceling pickup with front and rear sound inlets facing roughly the same
direction or perpendicular to each other according to the present invention; however,
two individual electret noise-canceling sound sensors or two individual non-anti-noise
electret sound sensors are arranged to overlap each other. The effect of noise canceling
and the frequency range of noise canceling are directly associated with the distance
between the two voice receiving ports, which receive voice from a main voice resource,
of the two individual sound sensors. In other words, the shorter the distance is, the
better effect of noise canceling is obtained, and the wider frequency range of noise
canceling is applicable. According to the above-mentioned patent applications of the
present inventor, the drawback resulted from the big value thickness of the voice
receiving portion of the main cylinder body of the electret noise canceling pickup has
been overcome. The thickness of the voice receiving portion of the main cylinder body
can be reduced to 0.2 to 20mm based on the design or process requirements, and can be
thinner or thicker than 0.2 to 20mm if necessary. In the conventional non-anti-noise
electret pickup, the corresponding thickness is relatively large, and there is a gap
between the two individual sound sensors for voice entering into, so that the two voice
receiving ports of the main voice resource of the two individual sound sensors is far
away from each other. As a result, the required performance can not be obtained.
-
In conventional electret non-anti-noise pickups, the sound inlet is on the front
wall of the front cover. In the noise-canceling pickup with front and rear sound inlets
facing roughly the same direction or perpendicular to each other according to the
present invention, however, two individual electret noise-canceling sound sensors or
two individual non-anti-noise electret sound sensors are arranged to overlap each other.
In order to let the sound wave go into the inlet on the front wall of the front cover of the
rear sound sensor, a sound pass should be set up between two front and rear
non-anti-noise electret sound sensors to increase the distance between two sound
sensors.
-
As the pickup of the present invention cancels environmental noise by means of
different distances between the pickup and the main sound source and between the
pickup and the environmental noise, it is a sound device very sensitive to the distance
between the pickup and the main sound source. When it exceeds effective receiving
distance, the sound signal from the main sound source will be attenuated rapidly;
therefore, an alarming signal for exceeding the receiving distance should be generated
timely. In addition, an amplifying ratio control circuit that can automatically adjust the
amplifying ratio according to the distance between the pickups and the main sound
source is needed.
-
The object of the present invention is to provide a noise canceling pickup with
front and rear sound inlets that face roughly the same direction or substantially
perpendicular to each other, which has a high ability to cancel noises, and overcomes
the drawbacks of conventional individual noise canceling sound sensors, which has an
insufficient ability to cancel noise in adverse circumstances of high noises.
-
Another object of the present invention is to provide a noise canceling pickup
with front and rear sound inlets that face roughly the same direction or substantially
perpendicular to each other to control the tolerance of the parts and raise the yield when
producing in large scale.
-
Another object of the present invention is to provide a kind of pickup, which has
the sound inlets on the sidewalls of non-anti-noise sound sensors. This kind of pickup
can be used for places where the sound inlets need to be on the sidewall. For example,
in case that several non-anti-noise sound sensors ranged front and back are used to form
a noise canceling pickup, if the conventional non-anti-noise pickup has its sound inlet
on its front wall of the front cover, in order to let sound wave go into the sound inlets on
the front wall of the front cover of the rear sound sensor, a sound pass between front and
rear sound sensors will need to be set up. In the case of a pickup with its sound inlets on
its sidewall, a sound pass will not be needed and, thus, the distance between front and
rear sound inlets of a noise canceling pickup that includes a plurality of non-anti-noise
sensors can be reduced. Of course, this kind of pickup is also suitable for use in places
where other conventional pickups are usually used.
-
Another object of the present invention is to provide a device and a circuit,
which can monitor whether or not the distance between the pickup and the main sound
source exceeds the receiving distance, make an over-distance alarm and adjust the
amplifying ratio of the amplifier according to the distance between the pickup and the
main sound source.
-
A noise-canceling pickup according to one embodiment of the present
invention comprises a main cylinder body and a rear cylinder body. The main cylinder
body has one or more noise-canceling sound sensors and/or one or more non-anti-noise
sound sensors with a one-dimensional or multi-dimensional structure. There are one or
more front sound inlets and/or one or more rear sound inlets on front end and rear end
of the sidewall of the main cylinder body. The angle between the orientations of a front
sound inlet and a rear sound inlet is 0 °∼ 135°. The outside main cylinder body has one
or more noise-canceling sound sensors and/or one or more non-anti-noise sound
sensors with a one-dimensional or multi-dimensional structure. There are one or more
front sound inlets and/or one or more rear sound inlets on front end and rear end of the
sidewall of the main cylinder body. The angle between the orientations of a front sound
inlet and a rear sound inlet is 0 °∼ 135 °.
-
Especially, the sound inlets are not connected to each other in the main cylinder
body and located at the corresponding side of a vibration diaphragm. Especially, the
front sound inlets are on the sidewall of the main cylinder body and/or the rear sound
inlets are on the sidewall of the main cylinder body. Especially, the sound inlets are on
the sidewall of the sound sensors. Especially, there are sound collecting caps at the
front and rear sound inlets on external sidewall of the main cylinder body. Especially,
there are diaphragm-tightening rings in the main cylinder body. A division plate with
an extrusion portion at its center is placed between the front spacer in front of
diaphragm-tightening ring and the division plate spacer. The extrusion portion at the
center of the division plate is set into the diaphragm-tightening ring with the edge of the
extrusion portion touching tightly with the inner edge of the diaphragm-tightening ring,
making a cavity between it and the vibration diaphragm. Especially, the division plate
in the noise canceling sensor is set in inside edge of the diaphragm-tightening ring and
there is set a division plate spacer between the vibration diaphragm and the division
plate. Especially, there is a symmetrical structure in the noise canceling sound sensor,
including from both sides of the vibration diaphragm to front and rear sound inlets.
Especially, there is a back electrode, which goes through a back-electrode hole in the
back electrode seat at the same level of back electrode and is connected to the related
circuit. Especially, there is a sound guide and a sound tube at the place of sound inlet in
the main cylinder body. Especially, the electric circuit of noise-canceling sound sensor
is set in the main cylinder body or in the rear cylinder body. Especially, there is a
conductive contact in the rear cylinder body and between the diaphragm-tightening ring
and the outer shell of sound sensor body in the noise canceling pickup. Especially, there
is a sound control switch circuit that consists of detecting circuit, comparison circuit
and switching circuit. Especially, there is a distance alarm circuit in the pickup, which
consists of comparison circuits. Especially, there is included an amplifying ratio control
circuit that can regulate the amplifying ratio of amplification circuit according to
receiving distance. This amplification circuit consists of window comparison circuits of
multiple sections. Especially, there is included a second common mode rejection circuit
for second differential mode sound signals received by sound sensors. Especially, the
front and rear sound inlets are on the sidewall of the front cover of the main cylinder
body and/or on the sidewall of the main cylinder body individually. Especially, along
the lines of the main sound source on a side of the main cylinder body, the front and rear
sound inlets are on a sidewall of the front cover of the main cylinder body and/or on the
other side of the rear cover of the main cylinder body and ranged front and back, or
along the lines of the main sound source on a side of the main cylinder body, the front
and rear sound inlets are on a sidewall of the front cover of a main cylinder body and on
the other side of the rear cover of the other main cylinder body and ranged front and
back. Especially, the multi-front-cylinder-body are ranged front and back, and the front
and rear sound inlets are set on the sidewall of the front cover of the front cylinder-body
individually and/or at the sidewall of rear cover of the front cylinder-body, along the
lines of the main sound source on a side of the main cylinder body, the front and rear
sound inlets are set near the center of the sidewall of the front cover and/or rear cover,
or along the lines of the main sound source on a side of the main cylinder body, they are
set on the both sides of front and/or rear sidewalls front and back.
-
The primary advantage of the present invention is an individual-type or
combined-type noise-canceling pickup that comprises multiple sound inlets arranged in
front and back, or at least, a pair of corresponding front and rear sound inlets. The
orientations or directions of the openings of the corresponding front and rear sound
inlets are roughly the same (the range is 0° ± 45°), or substantially perpendicular to each
other (the range is 90° ± 45°), (i.e. the angle between the orientations of the opening s of
the front and rear sound inlets is about 0 °∼ 135 °). The meaning of roughly same
direction or perpendicular is that when the main sound source 38 is located at the
extension line 40 of the central line of the main cylinder body of pickup of the front
wall 39 of front cover of the pickup, there can be one or more front sound inlets, and
one or more rear sound inlets. Let the angle between the direction of the opening of the
front sound inlet and the extension line 40 be α and the angle between the direction of
the opening of the rear sound inlet and the extension line 40 be β. If α - β is about
0°, it means the directions or orientations of the front and rear sound inlets are roughly
the same. If α - β is about 90 °, it means the directions or orientations of the front
and rear sound inlets are roughly perpendicular to each other. The difference between
the two anglesis within about 0°∼ 130°.
-
The anti-noise function of the present invention is much better than that of
existing pickup with only one sound sensor. As the directions of sound inlets are same
(especially acoustic structure of acoustic channels to the vibration diaphragm are
roughly same), the phase of inlet sound signals are roughly same. The phase of a sound
signal reached at the vibration diaphragm can be changed by changing the structure of
acoustic structure of acoustic channels or through an electrical circuit. Then a common
mode rejection circuit is used for common mode rejection of that signal with other inlet
signal. The final output is a differential mode signal without noise. Even under very
harsh environment with high noise, the pickup of the present invention still has a high
signal-to-noise ratio. It can be treated with a computer digital treatment procedure to
make an anti-noise treatment, so as to reach a receiving purpose at a fixed position. The
noise-canceling pickup of this present invention can also be used in places where low
noise pickup are usually used. Furthermore, a problem of non-symmetrical acoustic
structure at the front and back sides of the vibration diaphragm in the main cylinder
body in my patents mentioned above has been improved. This is achieved by changing
structure of the pickup. For example, the shape and position of the division plate 9 with
a central extrusion and the division plate spacer 10 between the front spacer 8 and the
diaphragm-stretching ring 11 can be changed by providing a ring-shaped division plate
9 and putting it into the diaphragm-stretching ring 11, with its outside edge closing to
the inside edge of the diaphragm-stretching ring 11. Division plate spacer 10 can be set
between the division plate 9 and the vibration diaphragm 12. The back electrode and the
back electric electrode can be integrated in a single unit. The back electric electrode can
be connected from the back electrode seat directly to inner back cylinder body. These
structure improvements also increase the yield of the products.
Brief Description of Drawings
-
The embodiments of the present invention will be described in conjunction with
accompanying drawings as follows.
- Fig. 1 is a cross section view of a noise-canceling pickup of present invention.
Fig. 1A ∼ 1C are the cross section views in lines A-A and B-B and C-C as shown in Fig.
1, respectively.
- Fig. 2 is a cross section view of a noise-canceling pickup of the present
invention. Figs. 2A to 2C are the cross section views in lines A-A, B-B and C-C as
shown in Fig. 2, respectively.
- Fig. 3 is a cross section view of a noise-canceling pickup of present invention.
Fig. 3A ∼ 3C are the cross section views in lines A-A and B-B and C-C as shown in Fig.
2 respectively.
- Fig. 4 is a cross section view of a noise-canceling pickup of present invention.
Fig. 4A ∼ 4B are the cross section views in lines A-A and B-B as shown in Fig. 4,
respectively.
- Fig. 5 is a cross section view of a noise-canceling pickup of present invention.
Fig. 5A ∼ 5C are the cross section views in lines A-A and B-B and C-C as shown in Fig.
5, respectively.
- Fig. 6 is a cross section view of a noise-canceling pickup of the present
invention. Figs. 6A to 6B are the cross section views in lines A-A and B-B as shown in
Fig. 6, respectively.
- Fig. 7 is a cross section view of a noise-canceling pickup of the present
invention. Figs. 7A to 7B are the cross section views in lines A-A and B-B as shown in
Fig. 7, respectively.
- Fig. 8 is a cross section view of a noise-canceling pickup of the present
invention. Figs. 8A to 8B are the cross section views in lines A-A and B-B as shown in
Fig. 8, respectively.
- Fig. 9 is a cross section view of a noise-canceling pickup of the present
invention. Fig. 9A is the cross section view in line A-A as shown in Fig. 9.
- Fig. 10 is a cross section view of a noise-canceling pickup of the present
invention. Fig. 10A is the cross section view in line A-A as shown in Fig. 10.
- Fig. 11 is a cross section view of a noise-canceling pickup of present invention.
5 Fig. 11A ∼ 11C are the cross section views in lines A-A and B-B and C-C as shown in
Fig. 11, respectively.
- Fig. 12 is a cross section view of a noise-canceling pickup of present invention.
Fig. 12A ∼ 12B are the cross section views in lines A-A and B-B as shown in Fig. 12,
respectively.
- Fig. 13 is a cross section view of a noise-canceling pickup of present invention.
Fig. 13A ∼ 13C are the cross section views in lines A-A and B-B and C-C as shown in
Fig. 13, respectively.
- Fig. 14 is a cross section view of a noise-canceling pickup of present invention.
Fig. 14A ∼ 14C are the cross section views in lines A-A and B-B and C-C as shown in
Fig. 14, respectively.
- Fig. 15 is a cross section view of a noise-canceling pickup of present invention.
Fig. 15A ∼ 15B are the cross section views in lines A-A and B-B as shown in Fig. 15,
respectively.
- Fig. 16 is a cross section view of a noise-canceling pickup of present invention.
Fig. 16A is the cross section views in line A-A as shown in Fig. 16.
- Fig. 17 is a cross section view of a noise-canceling pickup of present invention.
Fig. 17A is the cross section views in line A-A as shown in Fig. 17.
- Fig. 18 is a cross section view of a noise-canceling pickup of present invention.
Fig. 18A, Fig. 18B are the cross section views in lines A-A and B-B as shown in Fig. 14,
respectively.
- Fig. 19 is a cross section view of a noise-canceling pickup of present invention.
Fig. 15A, Fig. 15B are the cross section views in lines A-A and B-B as shown in Fig. 15,
respectively.
- Fig. 20 is a cross section view of a noise-canceling pickup of present invention.
Fig. 16A is the cross section views in line A-A as shown in Fig. 16.
- Fig. 21 is a cross section view of a noise-canceling pickup of present invention.
Fig. 17A is the cross section views in line A-A as shown in Fig.17.
- Fig. 22 is a cross section view of a noise-canceling pickup of present invention.
Fig. 18A, Fig. 18B are the cross section views in lines A-A and B-B as shown in Fig.14
respectively.
- Fig. 23 is a cross section view of a noise-canceling pickup of present invention.
Fig. 18A, Fig. 18B are the cross section views in lines A-A and B-B as shown in Fig. 14,
respectively.
- Fig. 24a is a circuit diagram illustrating a sound controlled switch used in a
noise canceling pickup according to the present invention.
- Fig. 24b is a circuit diagram illustrating a sound controlled switch used in a
noise canceling pickup according to the present invention.
- Fig. 24c is a circuit diagram illustrating a sound controlled switch used in a
noise canceling pickup according to the present invention.
- Fig. 25 is a circuit diagram illustrating a distance alarm circuit used in a noise
canceling pickup according to the present invention.
- Fig. 26 is a cross section view of noise-canceling pickup of present invention.
Fig. 26A-Fig. 26C are the cross section views in lines A-A, B-B and C-C as shown in
Fig. 26, respectively.
- Fig. 27 is a cross section view of a noise-canceling pickup of present invention.
Fig. 27A-Fig. 27C are the cross section views in lines A-A, B-B and C-C as shown in
Fig. 27, respectively.
- Fig. 28 is a cross section view of a noise-canceling pickup of present invention.
Fig. 28A-Fig. 28C are the cross section views in lines A-A, B-B and C-C as shown in
Fig. 28 respectively.
- Fig. 29 is a cross section view of a noise-canceling pickup of present invention.
Fig. 29A-Fig. 29C are the cross section views in lines A-A, B-B and C-C as shown in
Fig. 29 respectively.
- Fig. 30 is a cross section view of a noise-canceling pickup of present invention.
Fig. 30A-Fig. 30B are the cross section views in lines A-A, B-B as shown in Fig. 30
respectively.
- Fig. 31 is a circuit diagram illustrating an over-distance alarm circuit used in a
noise canceling pickup according to the present invention.
- Fig. 32 is a circuit diagram illustrating an over-distance alarm circuit used in a
noise canceling pickup according to the present invention.
- Fig. 33a is a digital data acquisition common mode rejection system block
diagram.
- Fig. 33b is a digital data acquisition common mode rejection system block
diagram.
- Fig 34 is a computer flow chart of a noise-canceling pickup on over receiving
distance used in the pick up of present invention.
- Fig 35 is a computer flow chart of a noise-canceling pickup on over receiving
distance, which is made from a non-anti-noise sound sensor, used in the pickup of
present invention.
- Fig 36 is an electric circuit of a noise-canceling pickup on over receiving
distance used in the pickup of present invention.
- Fig 37 is a computer flow chart for digital noise-canceling used in a pickup,
which receives a voice at fixed distance or at a fixed point, according to the present
invention.
- Fig 38 is a window comparison circuit of multiple sections used in the pickup of
present invention, which can regulate the amplifying ratio of amplification circuit
according to receiving distance.
- Fig 39 is an amplifying ratio control circuit used in the pickup of present
invention, which can regulate the amplifying ratio of amplification circuit according to
receiving distance.
- Fig 40 is a cross section view of a noise-canceling pickup of the present
invention.
- Fig 41 is a computer flow chart for digital noise-canceling used in the pickup of
the present invention.
- Fig 42 is a noise canceling circuit bock diagram according to present invention.
- Fig. 43 is a cross section view of a noise-canceling pickup of the present
invention. Fig. 43A is the cross section view in line A-A as shown in Fig. 43.
- Fig. 44 is a cross section view of a noise-canceling pickup of the present
invention. Fig. 44A is the cross section view in line A-A as shown in Fig. 44.
- Fig 45 is a cross section view of a noise-canceling pickup of the present
invention.
-
Detailed Description of Embodiments
-
Fig. 1 is a cross section view of a noise-canceling pickup of the present
invention. Fig. 1A ∼ 1C are the cross section views in lines A-A and B-B and C-C as
shown in Fig. 1 respectively. In Fig 1, the electret noise-canceling pickup of present
invention has a cylinder shell that is formed by combining inner sidewall 1 with inner
rear cylinder body 20. At the front of the sidewall 1 of inner cylinder body there is
provided a front wall 2 of the front cover, and at the rear of the sidewall 1 of inner
cylinder body there is provided a rear wall 3 of the rear cover. The cylinder shell can
also be square, or rectangular, or oval, or other shape. The outer diameter of the
sidewall 1 of inner cylinder can be within 0.2 ∼ 55mm and the height within 0.2 ∼50mm
according to the test results. In the main cylinder body there are provided anti-noise
sound picking unit(s), which can comprise following elements: One or more front
sound inlets 4 and one or more rear -sound inlets 4a are provided at the front end and
rear end of the sidewall 1 of inner cylinder of the cylinder shell, respectively. A
sound-collecting cover 19 is located on the outer surface of sidewall 1 of the inner
cylinder at locations corresponding to the front and rear sound inlets. On the inner wall
of the inner sidewall 1 around the front and rear sound inlets 4 and 4a, there are
provided a front damping film 5 and a rear damping film 5a, which are placed in a
cavity formed between a front damping film fixing sheet 6, a rear damping film fixing
sheet 6a and the sidewall 1 of inner cylinder body. If desirable, those damping films
can be placed at other positions at the front or back side of the vibration diaphragm in
the main cylinder body or at the outside of the inlets. According to design requirements,
a complete or a part of diaphragm can be used, or some parts can be added or removed.
In addition, vibration diaphragm 12 near to division plate spacer 10 and
diaphragm-stretching ring 11 can be set at the position near the center of the sidewall 1
of the inner cylinder or close to front wall of front cover or rear wall of rear cover. The
division plate 9 with a central extrusion is set at the position between the division plate
spacer 10 in front of the diaphragm-stretching ring 11 and the front spacer 8, with the
central extrusion of the division plate 9 inserting into the diaphragm stretching ring 11
and the edge of the central extrusion is pressed against the inner edges of the division
plate spacer 10 and the diaphragm-stretching ring 11, so that a cavity between the
vibration diaphragm 12 and the division plate 9 is formed. Therefore, the rear surface of
the division plate 9 is near to the front surface of the vibration diaphragm 12, but there
is a distance between the rear surface of the division plate 9 and the front surface of the
vibration diaphragm 12. There is a division plate in the main cylinder body and there is
a gap between the vibration diaphragm and the division plate. If desirable, the separate
distance between the rear surface of the division plate 9 and the front surface of the
vibration diaphragm 12 can be made about the same as that between the near surface of
the vibration diaphragm 12 and the front surface of back electrode 15. In general, the
distance between the rear surface of the division plate 9 and the front surface of the
vibration diaphragm 12 should be determined according to the acoustic characters of
the front and rear sides of vibration diaphragm 12, so that the time for a sound to travel
from the front sound inlet to the front side of the vibration diaphragm 12 is about the
same as that from the rear sound inlet to the rear side of the vibration diaphragm 12,
Thus, the acoustic characters at both sides of the vibration diaphragm 12 are about the
same. According to design requirements, the front spacer 8, the division plate 9 and the
division plate spacer 10 can be made of conductive or non-conductive metal or
nonmetal materials. If division plate 9 is made of metal material, the division plate 9
can be electrically connected with the diaphragm stretching ring 11, e.g., through direct
contact, on the other hand, the two can be separated with a nonmetal material between
them and insulated from each other. The nonmetal material can also secure a tight
connection. The thickness of the central extrusion of division plate 9 can be equal to or
not equal to the thickness of the back electrode 15. In order to make their thickness
about equal, the front surface of the division plate 9 can be made flat, or convex, or
concave relative to the vibration diaphragm 12. The thickness and shape of division
plate 9, back electrode 15 and division plate spacer 10 may be adjusted so as to make
the acoustic characters at both sides of the vibration diaphragm 12 be similar or about
the same. For example, the shape for the rear surface of the back electrode, which faces
the rear wall of the rear cover, can be designed to be a similar or the same shape as that
of the front surface of the division plate 9, or the thickness of the back electrode can be
made equal to that of the central extrusion of division plate 9 and so on. There is set a
hole 18 on the division plate 9, and a hole 18a on the back electrode. The quantity, size
and position of the holes 18 and 18a on the two can be symmetrical or non-symmetrical.
-
The division plate spacer 10 can be set at the position between the front surface
of diaphragm stretching ring 11 and the edge of the non-extruding portion of division
plate 9, or at the inner edge of diaphragm stretching ring 11 between the vibration
diaphragm 12 and the central extrusion of division plate 9, so as to form a cavity
between the vibration diaphragm 12 and the central extrusion of division plate 9 and the
inner edge of division plate 9. The division plate 9 can be installed at other places as
long as it has the function of separating the vibration diaphragm 12 from the central
extrusion of division plate 9 at a predetermined distance. The distance between the
division plate 9 and the vibration diaphragm 12 depends on the thickness of division
plate spacer 10. The corresponding inner edge of back electrode spacer 13 can be
extended to a position corresponding to the inner edge of division plate spacer 10.
-
At the front end of the sidewall 1 of inner cylinder body, there are provided a
front sound inlet 4, a rear sound inlet 4a. Between a front damping film fixing sheet 6
and a rear damping film fixing sheet 6a, there are provided a front sound wave guide 7
and a rear sound wave guide 7a. Through the guide by the front and the rear sound wave
guides 7 and 7a and the front and rear sound channels 27 and 27a, the transmission
direction of sound wave entered into the front and rear sound inlets are changed
towards the vibration diaphragm so that the sound vibrations at both sides of vibration
diaphragm are similar and the common mode rejection can be done efficiently.
According to design requirements, sound channels 27 and 27a can point to other
directions. It is possible to use only sound channel without the sound guide, or not to
use the sound channel and the sound guide. A division plate front cavity 16 is formed
between the inner surface of sound wave guide 7, inner wall of the front spacer 8 and
the front surface of the division plate 9. A vibration diaphragm front cavity 17 is formed
between the vibration diaphragm 12, diaphragm stretching ring 11 set along the
sidewall of inner cylinder body and the rear surface of the division plate 9. Sound wave
goes through sound gathering cover 19, front sound inlet 4, front damping film 5, front
damping film fixing sheet 6, guide 7, sound channel 27, into division plate front cavity
16, then though division plate hole 18 on the division plate 9 into vibration diaphragm
front cavity 17, and acts on the front surface of vibration diaphragm 12. In order to
reduce environmental noise and form a "8" shape or "hart" shape direction character, at
the rear end of sidewall of inner cylinder body there is set one or more rear sound inlets
4a. The sound wave goes through sound gathering cover 19, rear sound inlet 4a, rear
damping film 5a, rear damping film fixing sheet 6a, rear sound channels 27 in rear
sound wave guide 7a, and enters back electrode rear cavity 16a that is formed between
the rear surface of the back electrode 15, front surface of sound wave 7a and the rear
surface of the back electrode set 14, then passes through the back electrode hole 18a of
the back electrode 15 and reaches into the vibration diaphragm rear cavity 17a between
the back electrode 15 and the vibration diaphragm 12, which are separated with the
back electrode spacer 13, and acts on the rear surface of the vibration diaphragm 12.
According to design requirements, it will be possible to remove division plate spacer 10,
frond sound wave guide 7, rear sound wave guide 7a and sound channels 27 in rear
sound wave guide 7a, completely or partially. The sound wave guide can be made of
conductive or non-conductive metal or nonmetal materials. The sound wave guide and
the damping film fixing sheet can be made from same or different materials. They can
be made into one unit or individual units. According to design requirements, it will be
possible to remove the sound wave guide.
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By making the acoustic characters of the sound wave signal arriving at the
vibration diaphragm 12 from the front sound inlet be similar or about the same as that
from the rear sound inlet to the vibration diaphragm 12 and by means of mechanical
structure, the phase difference of the sound waves acted on two sides of the vibration
diaphragm 12 can be roughly about 180°, which will have better common mode
rejection results, outputting differential mode signal to cancel noise.
-
Because except that the electret noise-canceling pickup of this present invention
adds sound gathering cover19, front and rear sound inlets 4 and 4a on the sidewall of
inner main cylinder body, frond sound wave guide 7, rear sound wave guide 7a, front
damping film 5 and rear damping film 5a in front of front and rear sound wave guide 7
and 7a, inner rear cylinder body 20, and inner-rear-cylinder-body-fixing unit 26, and
some other structures, its operating principle, structure, materials, and circuits are
similar as those of the above-mentioned patents and prior patent applications, so their
details are omitted.
-
The opening of sound gathering cover 19 can point towards the main sound
source (or other directions). The direction of each opening of sound gathering cover 19
should be same. Of course, those directions of the openings of sound gathering covers
can be made different. Sound gathering covers 19 collect sound waves generated from
the main sound source and guide them into sound inlets 4 and 4a and, in the mean time,
reduce noises from other directions. It can be larger than, equal to or less than outside
size of the sound inlet. The sound gathering cover 19 has the function to change the
direction of the sound inlets of the main cylinder body, which can make the directions
of the front and rear sound inlets about the same and make the phases of sound waves at
the front and rear sound inlets roughly the same. Phase shift of the sound wave entered
into sound sensors is then conducted by mechanical or electrical method to make the
phase difference of sound waves from the front and the rear sound inlets about 180°,
which will be input to a common mode rejection circuit for common mode rejection,
outputting differential mode signal to cancel noise. Depending on design requirements,
the noise-canceling sound sensors used in the preset invention may or may not use
sound gathering covers 19 over the sound inlets, or only use over some of the sound
inlets. The positions of sound inlets of the sound sensors and the sound gathering cover
19 can be symmetrical or non- symmetrical and their direction can be same or distinct.
The central line 32 of front sound gathering cover 19 can be on or not on the same line
with the central line 32a of rear sound gathering cover 19. When they are on different
lines, front central line 32 can be in parallel with rear central line 32a, or they are
intersected at a certain angle. Front central line 32 and rear central line 32a can be in
parallel with the axial line of inner main cylinder body or they are intersected at a
certain angle. When the sound gathering cover is not used" (1) the directions of sound
inlet 4 and 4a on the sidewall of inner cylinder body do not point towards the main
sound source but point the same direction, as shown in Figure 1, or (2), as shown in
Figure 3, partial sound inlets are set on the front wall 2 of front cover, towards to the
main sound source, and other partial sound inlets are set on the sidewall 1 of inner
cylinder body, towards to a direction perpendicular to the main sound source. Under
this situation, through its anti-noise function is not as good as when sound gathering
cover 19 with direction towards to main sound source is used, but its anti-noise
efficiency is better than when the sound inlets are formed on the rear sidewall of front
and rear covers and is still satisfactory. Therefore, the sound gathering cover 19 can be
used or not used according to design requirement. The internal and external shape of
external rear cylinder body, external main cylinder body, internal main cylinder body,
internal main cylinder body support 31, internal rear cylinder body 20, rear cylinder
body 20a, sound gathering cover 19, front and rear sound wave guide 7 and 7a, sound
inlets 4 and 4a, sound channels 27 and 27a, division plate 9, division plate hole 18 and
front spacer 8 etc can be regular or irregular square, rectangle, circle, cylinder, triangle,
diamond, polygon, sector, oval or other curved shapes, such as para-curve and so on, or
other geometry, or other basic shapes, partial curve, or a complex shape that consists of
some simple curves and so on. They can be made of metal or nonmetal or other
complex materials.
-
The internal main cylinder body and internal rear cylinder body 20 can be
straight-line or curved. The length and width of sidewall 1 of internal cylinder body can
be within the range of 0.2 ∼ 50 mm, in general within 1 ∼ 15mm. The sound wave
guides 7 and 7a can be made as a unit with damping film fixing sheets 6 and 6a or
separately made. They can use metal or nonmetal materials, or they can be made with
the same or different materials. In order to have a heart-shape direction character, it is
possible to fill damping materials into the back electrode cavity 16a to adjust
transmitting speed of sound wave, so that sound waves entered from the front and rear
sound inlets reach at the two sides of vibration diaphragm 12 at about the same time.
Using that filling method, the two sound waves can be correctly coupled to cancel noise.
If it is an "8"-shape direction character, the damping material (called as "damping
material 'A'") for reducing transmitting speed of sound wave can be omitted. The kind
and quantity of the filled "damping material 'A"' depend on design requirements and
can be decided through test. Damping film 5 and/or 5a can be used at any point of the
sound transmitting passage from the outside of inlets 4 and 4a on the sidewall of the
cylinder body to the vibration diaphragm. Damping film 5 and/or 5a can also be
removed. Damping film 5 and/or 5a can be made of non-metal material such as carpet
or non-woven fabric etc, or metal material such as metal net, or mixed metal with
nonmetal materials, or other synthetic materials with sound damping functions (called
as "damping material 'B"'). Using "damping material 'B' damping film is to cancel
possible noise generated by the breath from the user's mouth imposed onto vibration
diaphragm 12. The material and application principle are the same as that of the
damping film installed at front of sound inlet on the internal shell of the noise-canceling
electret sensor. When the noise-canceling electret sensor of present invention is used
directly without being protected by a microphone shell, in order to present vibration
diaphragm 12 from being damaged and to prevent it from reducing its effect, the
noise-canceling electret sensor may be put into an external shell. Damping film 5 can be
made of damping carpet or damping non-woven fabric or other materials with sound
damping performance. Damping film 5 and/or 5a, and damping film fixing sheet 6
and/or 6a can be used or not used according to design requirement. For example, in case
that a sound sensor is put into the external shell, the damping film may be not put into
the pickup. If an external shell is not used and the pickup of present invention is used
alone, it may be put in the pickup according to the demand in application. Back
electrode seat 14 can be made with insulation materials.
-
Because only necessary elements of a noise-canceling electret sound sensor are
put in the internal cylinder body, other elements such as impedance transformer circuit
21 (it can be a composition field effect transistor or IC or other circuits), printed circuit
board 23, connection terminals 24 are put in the internal rear cylinder body, the distance
between front and rear sound inlets on the sidewall of internal main cylinder body
respectively facing to sound source can be very short to have higher anti-noise
capability at high frequency. On the other hand, the internal rear cylinder body can also
be connected with the microphone supporter directly without external shell of the
microphone. In order to install the pickup onto an external device and prevent it from
falling down, a fixing mechanism 26 is provided on the outside of internal rear cylinder
body 20 or on any proper position of the internal rear cylinder body 20. The fixing
mechanism 26 can have bulging or hollow shape or other shape. Figure 1 shows a
fixing mechanism 26 with hollow shape. In rear cylinder body there are put a front
internal support 22 and a rear internal support 25. There is a back electrode 15a on the
back electrode seat 14 and the support going through the hole 28 and a sidewall of the
internal main cylinder body into the internal rear cylinder body.
-
Back electrode 15a goes through the back electrode through hole 28 of the back
electrode seat 14 at the same level of back electrode 15. It can be made together with
back electrode 15 as a single unit or made as an individual unit. Back electrode 15a is
connected with a pin of field effect transistor 21 (or IC). The composition field effect
transistor 21 and other circuit components are installed on the printed circuit board 23,
which is connected with an external circuit through output pin 24. The lead of back
electrode, "Back electrode 15a", can also be led out through the rear wall 3 of rear cover
or the wall of internal rear cylinder body. The lead of back electrode, "Back electrode
15a", can be made together with the back electrode as an integrated unit or made as an
individual unit. According to design requirement, the electric circuit can be installed in
the rear cylinder body or on other position in the outside of the pickup, not in internal
main cylinder body or the internal rear cylinder body. The internal rear cylinder body
20 can be cylindrical or other shapes. Its diameter (or its section area) can be more than,
equal to or less than diameter of the sidewall 1 of internal cylinder body. Internal rear
cylinder body 20 can be installed at any proper position in the internal main cylinder
body as long as it does not disturb sound wave going into the front sound inlet 4 and the
rear sound inlet 4a. It can point to any direction.
-
According to the performance of vibration diaphragm 12 on vibration, vibration
diaphragm 12 can be made of FEP50A (Copolymer of Teflon with
polysixfluoroethylene) or polyester film and so on, or metal, nonmetal, composite or
other materials for vibration film. Its thickness can be decided by test, it may be about
12 µm, or larger or less than 12 µm. There may be a metal layer on the vibration
diaphragm 12. An electret film can be applied on the back electrode 15. The sidewall 1
of internal cylinder body, the front wall of front cover 2, the rear wall of rear cover 3,
the internal rear cylinder body 20, and the shell of sound gathering cover 19 can be
made of stainless steel, copper, aluminum and other metal materials, or plastic
materials or other composite materials. For other parts of the pickup of present
invention please refer to the structure and materials of various 1-stage or multi-stage
air-conductive type of electret noise-canceling pickups with the direction character of
"heart shape" or "8-shape". The sidewall 1 of internal cylinder body, the front wall of
front cover 2, the rear wall of rear cover 3, the internal rear cylinder body 20, and the
shell of sound gathering cover 19 can be made separately and assembled together as
shown in the drawings or be made assome composites and then assembled. The same
method can be used for internal structures.
-
Other new high performance anti-noise pickups can be made by using various
inner main cylinder body of noise-canceling pickups in present inventor's prior patents
and patent applications and by improving various existing sound noise-canceling
pickups, as well as by adding the sound gathering cover 19, sound inlets 4 and 4a on the
sidewall of internal main cylinder body, front sound wave guide 7, rear sound wave
guide 7a and so on.
-
Actually, each embodiment of present invention can be established by using
noise-canceling sound picking-up and distance sound receiving pickup that consists of
single or multiple noise canceling sound sensor/sensors and/or single or multiple
non-noise-canceling sound sensor/sensors.
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Figure 2 shows the sectional view of an acoustic noise canceling pickup of this
invention and Figures 2A to 2C are the sectional view of the A-A line, B-B line and C-C
line shown in Figure 2. From the comparison between Figure 2, Figure 1 and Figures
1A to 1C, we can see that their difference lies in: Back electrode electrode 15a bypasses
the sound channel 27a of back electrode seat 14 from outside back electrode seat 14 and
is connected to the impedance conversion electric circuit 21 and printed electric circuit
board 23 placed at rear end of the internal main cylinder body (They can also be placed
inside the internal rear cylinder body 20 connected to the rear end of the side wall 1 of
the internal cylinder body).
-
Figure 3 shows the sectional view of an acoustic noise canceling pickup of this
invention and Figures 3A to 3C are the sectional view of the A-A line, B-B line and C-C
line shown in Figure 3. From the comparison with Figure 2, Figure 1 and Figures 1A to
1C, we can see that their difference lies in: the division plate and the division plate
spacer in front of the vibrating diaphragm 12 are removed. Sound waves entering from
sound gathering cover 19 and front sound inlet 4 pass through front damping film 5 and
front damping film fixing sheet 6 and are guided by the sound channel 27 on sound
wave guide 7, so that the transmission direction of sound waves is changed to
approximately pointing to the vibrating diaphragm. The sound waves then directly
enter the cavity 17and act on vibrating diaphragm 12 in front surface of vibrating
diaphragm 12 to cause it to vibrate. And since internal rear cylinder body is unavailable,
electric circuits are placed in the internal cylinder body. Therefore, those structures
behind back electrode 15 need to be modified accordingly. Back electrode electrode
15a does not pass through the back electrode through hole 28 on back electrode seat 14
and the side wall of the internal main cylinder body to enter the rear cylinder body,
rather it directly enters the rear section of the pickup to connect with impedance
conversion electric circuit 21. Printed electric circuit board 23 is also in the internal
cylinder body 1. (In reality, it means the addition of inlets 4 and 4a on the side wall of
internal main cylinder body, front sound wave guide 7, rear sound wave guide 7a, front
damping film 5 and rear damping film 5a on one of the available acoustic noise
canceling pickup to change into the acoustic noise canceling pickup of this invention,
with the direction of front and rear sound inlets is approximately the same or
approximately perpendicular to each other.)
-
The most basic requirements of this embodiment of the present invention is to
provide the openings of front and rear sound inlets 4 and 4a on the side wall of the
internal main cylinder body, rather than install the rear opening on the rear wall of the
rear cover, as is the case in the conventional acoustic noise canceling pickups.
-
Figure 4 the sectional view of an acoustic noise canceling pickup of this invention
and Figures 4A to 4B are the sectional view of the A-A line and B-B line shown in
Figure 4.
-
From the comparison between Figure 4, Figure 3 and Figures 3A to 3C, we can see
that their difference lies in: Front sound inlet is not on the side wall of internal cylinder
body side wall, rather it is on front cover front wall 2. In this way, the sound gathering
cover 19 outside front sound inlet 4 will be of no use. The most basic requirements of
this embodiment of the present invention is to install the opening of rear sound inlet 4a
on the side wall 1 of the internal main cylinder body, rather than install the opening of
rear sound inlet 4a on the rear wall of rear cover as is the case in conventional acoustic
noise canceling pickups, and to add sound gathering cover 19 outside rear sound inlet
4a and allow the direction of the opening of sound gathering cover 19 to be
approximately the same as that of the opening of the front sound inlet.
-
Figure 5 shows the sectional view of an acoustic noise canceling pickup of this
invention and Figures 5A to 5C are the sectional view of the A-A line, B-B line and C-C
line shown in Figure 5.
-
From the comparison between Figure 5 and Figure 1, we can see that their
difference lies in: The rear cylinder body of the electret pickup in this embodiment of
the present invention is a complete supporting cylinder body. It can serve as the rear
cylinder body of the internal main cylinder body of two or more single sound sensors
(In the Figure are the upper electret sound sensor 29 and lower electret sound sensor 30
of on two single sound sensors). Therefore, the internal main cylinder body of rear
cylinder body 20a and upper electret sound sensor 29 and the internal main cylinder
body of lower electret sound sensor 30 are made into one component. Rear cylinder
body 20a can be made of stainless steel, copper, aluminum and other metals, plastics or
nonmetal materials or compound materials. Its shape can be approximately the same as
that of the internal rear cylinder body 20 in Figure 1 or different from it. When several
sound sensors are used, this invention uses a common mode signal inhibition electric
circuit to take out the differential mode signals received by two sound sensors to cancel
noises. Common mode signal inhibition electric circuit 32 can be placed in the internal
cylinder body 20a or at other proper places.
-
Here, the central axis (axis formed by the extended central line) of the internal
main cylinder body of various single electret sound sensors (such as the internal main
cylinder body of upper electret sound sensor 29 and the internal main cylinder body of
lower electret sound sensor 30) can be overlapped or not overlapped. When they are not
overlapped, they can be parallel to each other or have a certain angle between them.
-
In this embodiment of the present invention, the distance between various single
electret sound sensors and the main sound source must be different and the distance
between front sound inlets 4 on the front covers (front wall 2 of front cover) of the front
sound receiving ends of the internal main cylinder body of two electret noise canceling
sound sensors (such as the internal cylinder body side wall 1 of upper electret sound
sensor 29 and the internal cylinder body side wall 1 of lower electret sound sensor 30)
is decided based on design requirement. For instance, it can either range from 0.1 to
200mm or be higher or lower than this distance. It can be decided by test and usually
ranges from 1 to 20mm.
-
Based on design requirement, the internal main cylinder body of various electret
sound sensors can either be placed inside an external main cylinder body for protection
and support or multiple electret sound sensors can share the same external main
cylinder body. Based on design, an internal main cylinder body support 31 can be used
to connect and fix multiple internal main cylinder bodies of various electret sound
sensors (such as the internal main cylinder body of upper electret sound sensor 29 and
the internal main cylinder body of lower electret sound sensor 30) or internal main
cylinder body and external main cylinder body 33 (see Figure 11) are connected and
fixed for strengthening fixation. There can be one or more internal main cylinder body
support 31, whose shape can either be a cross or circle. In this embodiment of the
invention, all external rear cylinder body, external main cylinder body, internal main
cylinder body support 31, internal cylinder body side wall 1, internal rear cylinder body
20, rear cylinder body 20a, sound gathering cover 19, front and rear sound wave
guiding module 7 and 7a, sound channels 27 and 27a and front spacer 8 can be either
regular or irregular in shape based on design and actual needs, such as square, rectangle,
circle, oblong, triangle, rhombus, polygon and fan, or arcs in shape, such as oval,
parabolic camber and other basic shapes. They can also be complicated shapes due to
the combination of various basic shapes or a simple shape, or the a three-dimensional
structure (or a hollow three-dimensional structure) of various shapes, such as the
compound consisting of various single shapes, such as tube, channel, ball, board, piece,
etc. They can either be a whole or a part of a whole. But the shape and installation
position of this external rear cylinder body, external main cylinder body, internal main
cylinder body support, internal rear cylinder body and external rear cylinder body
cannot affect the noise canceling effects of each electret sound sensor, electret noise
canceling sound sensor and noise canceling pickup whose front and rear sound inlets
are generally of almost the same direction or perpendicular. This external main cylinder
body, internal main cylinder body support, internal rear cylinder body and external rear
cylinder body can be integrated or independent from each other. All of them can be
used or only some of them are used based on design.
-
To obtain differential mode signals to cancel noises, two methods can be employed:
a. The acoustic characters of the two sound wave channels from two corresponding
initial sound inlets of front and rear internal main cylinder bodies 29 and 30 to the
vibration diaphragm are made approximately the same (or not completely the same),
and the phase difference of the two sound wave signals is made about 180° by the
mechanical structures, so that they have better common mode inhibition effect when
acting on vibration diaphragm to obtain differential mode signals to cancel noises; b.
The acoustic characters of the two sound wave channels from two corresponding sound
inlets of front and rear internal main cylinder bodies 29 and 30 to the vibration
diaphragm are made approximately the same (or not completely the same) and their
phases are almost the same and common mode inhibition electric circuit can be used for
common mode inhibition to obtain differential mode signals to cancel noises.
-
Based on design, shockproof spacer 36 or shockproof cushion 37 can be provided
for shockproof separation between external main cylinder body 25, internal main
cylinder body support 31 and the internal main cylinder body of electret sound sensor.
The single sound sensors and components used in this invention can be various
available noise canceling sound sensors or non-noise canceling sound sensors, such as
electret sound sensor, moving-coil sound sensor, electromagnetic sound sensor,
piezoelectric ceramic sound sensor, semiconductor sound sensor, etc.
-
Of course, it is also possible not to use the internal main cylinder body of noise
canceling pickup whose front and rear sound inlets are of the same direction or
perpendicular approximately and use the main cylinder bodies of the various noise
canceling pickups in this inventor's previous patents and patent applications mentioned
above to work out a new assembled high noise canceling pickup together with the
available noise canceling sound sensors.
-
Figure 6 shows the sectional view of a noise canceling pickup in this invention and
Figures 6A to 6B are the sectional view of the A-A line and B-B line shown in Figure 6.
From the comparison between Figure 6, Figure 5 and Figures 5A to 5C, we can see that
their difference lies in: The rear sound inlet 4a, rear damping film fixing sheet 6a and
rear sound wave guiding module 7a inside the internal main cylinder body of upper
electret sound sensor 29 and lower electret sound sensor 30 and the rear sound channel
27a in rear sound wave guiding module 7a are removed and the front sound inlet 4,
front damping film fixing sheet 6 and front sound wave guiding module 7 inside the
internal main cylinder body of upper electret sound sensor 29 and lower electret sound
sensor 30 and the front sound channel 27 in front sound wave guiding module 7 are kept
to get an assembled noise canceling pickup with high noise canceling ability whose
front and rear sound inlets are of approximately the same direction or perpendicular
approximately. The pickup comprises an internal main cylinder body with upper
electret sound sensor 29 of non-noise canceling sound sensor and internal main
cylinder body and rear barel body 20a with lower electret sound sensor 30 to cancel
noises with common mode inhibition electric circuits. The internal main cylinder body
of upper electret sound sensor 29 and that of lower electret sound sensor 30 can be
integrated into a single internal main cylinder body based on needs, rather than two
independent ones.
-
In this way, the acoustic properties of the two sound wave channels from two
corresponding sound inlets of two front and rear internal main cylinder bodies to
vibration diaphragm can be approximately the same and their phases can also be about
the same and common mode inhibition electric circuit can be used for common mode
inhibition to obtain differential mode signals to cancel noises.
-
Figure 7 shows the sectional view of a noise canceling pickup in this invention and
Figures 7A to 7B are the top view of Figure 7 and the A-A line sectional view.
From the comparison between Figure 7, Figure 6 and Figures 6A to 6B, we can see that
their difference lies in: The internal main cylinder body of upper electret sound sensor
29 and that of lower electret sound sensor 30 are placed side by side, one in front and
the other behind, front and rear sound inlets 4 and 4a are placed on the side wall of
internal cylinder body (Though the one which should face vibration diaphragm 12 is
front cover and front wall 2, since the two sound sensors are placed side by side with
one in front and the other behind, a front and rear wall is formed at the sides in front of
and behind the cylinder body of each sound sensor, therefore, their front wall 2 of the
front cover forms cylinder body side wall 1) and sound gathering cover 19 is placed
outside inlet 4, with openings facing the same direction. Based on design, internal main
cylinder body support 31 can be placed between upper electret sound sensor 29 and
lower electret sound sensor 30. It can be made of metal or non-metal material. If it is
non-metal and the internal main cylinder body of upper electret sound sensor 29 and
lower electret sound sensor 30 need electromagnetic shielding, a metal main support
shielding frame 31a can be used. It can be a metal sheet or metal film coated on the
non-metal material of internal cylinder body support 31. It can be made into one single
main cylinder body or two main cylinder bodies. The pickup section and electric circuit
section which are commonly-used today can also be placed into the non-noise
canceling sound sensor structure (the sound sensor structure as shown in Figure 18) of a
main cylinder body to form an assembled high noise canceling pickup with internal
barrel bodies placed one in front and the other behind, rather than the pickup consisting
of main cylinder body and internal rear cylinder body as shown in the Figure.
-
Figure 8 shows the sectional view of a noise canceling pickup in this invention and
Figures 8A to 8B are the A-A line and B-B line sectional view as shown in Figure 8.
From the comparison between Figure 8, Figure 6 and Figures 6A to 6B, we can see that
their difference lies in: Since internal rear cylinder body is not used and the electrical
circuit is placed inside the internal main cylinder body, the structures behind back
electrode 15 need to be modified accordingly. Rather than passing the back electrode
pass hole 28 on back electrode seat 14 and entering the internal rear cylinder body
through the sidewall of the internal main cylinder body, back electrode 15a directly
enters the rear of pickup to connect with impedance conversion electric circuit 21.
Printed electric circuit board 23 is also in the internal cylinder body 1 to form two
sections, namely, upper sound sensor 31 and lower sound sensor 32. This in fact is just
the addition of front sound wave guiding module 7 and front sound channel 27 to the
internal structure of a non-noise canceling sound sensor. Many pickup and electric
circuit sections which are the same as the currently available non-noise sound sensors
can be installed inside a cylinder body, and internal cylinder body side wall sound inlet
4, front sound wave guiding module 7, front damping film 5, front damping film fixing
sheet 6 and sound gathering cover 19 can be added in front of the pickup section of
various electret sound sensors to form an assembled noise canceling pickup with the
openings of sound inlets facing the same direction.
-
Figure 9 shows the sectional view of a noise canceling pickup in this invention and
Figure 9A is the A-A line sectional view as shown in Figure 9. From the comparison
between Figure 9, Figure 7 and Figures 7A to 7B, we can see that their difference lies in:
The direction of the internal main cylinder body of the upper electret sound sensor 29 in
the main cylinder body of a non-anti-noise sound sensor is changed to facing the front,
inlet 4 is on front wall 2 the front cover facing the front and sound gathering cover 19 is
outside the inlet 4 at the side of the internal main cylinder body of lower electret sound
sensor 30, with openings facing the same direction. Based on design, internal main
cylinder body support 31 can be placed between upper electret sound sensor 29 and
lower electret sound sensor 30. It can be made into one single main cylinder body or
two main cylinder bodies. The pickup section and electric circuit section which are
commonly-used today can also be placed into the non-noise-canceling sound sensor
structure (the sound sensor structure as shown in Figure 18) of a main cylinder body to
form an assembled high noise canceling pickup with internal barrel bodies placed one
in front and the other behind, rather than the pickup comprising main cylinder body and
internal rear cylinder body as shown in the Figure.
-
Figure 10 shows the sectional view of a noise canceling pickup in this invention
and Figure 10A is the A-A line sectional view as shown in Figure 10.
-
From the comparison between Figure 10, Figure 7 and Figures 7A to 7B and Figure
9, we can see that their difference lies in: The direction of the internal main cylinder
body of the lower electret sound sensor 30 in the main cylinder body of a non-noise
sound sensor is changed to facing the front, inlet 4 is on front wall 2 of the front cover
facing the front and sound gathering cover 19 is outside the inlet 4a at the side of the
internal main cylinder body of lower electret sound sensor 30, with opening facing the
same direction as the sound gathering cover 19 of upper eletret sound sensor 29. Based
on design, internal main cylinder body support 31 can be placed between upper electret
sound sensor 29 and lower electret sound sensor 30, rear sound wave guiding module
7a can be placed in front of the inlet 4 of lower electret sound sensor 30 and rear sound
channel 27a of rear sound wave guiding module 7a is available between inlets 4a and 4.
It can be made into one single main cylinder body or two main cylinder bodies
separately. The pickup section and electric circuit section which are commonly-used
today can also be placed into the non-noise canceling sound sensor structure (the sound
sensor structure as shown in Figure 18) of a main cylinder body to form an assembled
high noise canceling pickup with internal barrel bodies placed one in front and the other
behind, rather than the pickup consisting of main cylinder body and internal rear
cylinder body as shown in the Figure. Likewise, the upper electret sound sensor 29 and
lower electret sound sensor 30 can also be reversed to get a new application.
-
Based on design, the internal main cylinder bodies of the upper electret sound
sensor 29 and lower electret sound sensor 30 as shown from Figures 5 to 10 can also be
designed into two separate main cylinder body casings or a shared internal main
cylinder body casing. The internal main cylinder body of the original upper electret
sound sensor 29 and the components inside lower electret sound sensor 30 are placed at
the front and back inside the shared internal main cylinder body casing, between which
internal main cylinder body support 31 inside the shared internal main cylinder body
casing is placed for isolation, which can both have the effect of isolating sound waves
and keeping the front and rear sound reception sections at a certain distance, as well as
connection and supporting functions. Subject to needs, the internal main cylinder body
support 31, the rear sound wave guiding module 7a of the front sound sensor and the
front sound wave guiding module 7 of the rear sound sensor can be integrated or
separated. The internal main cylinder body support 31 can either use materials with
sound wave impedance or other materials and can be designed into various appropriate
shapes based on needs.
-
Figure 11 shows the sectional view of a noise canceling pickup in this invention
and Figures 11 A and 11C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 11. From the comparison between Figure 11, Figure 1 and Figures 1A
to 1C we can see that their difference lies in: External main cylinder body 33 and
external rear cylinder body 34 are used and various types of noise canceling sound
sensors in this inventor's above-mentioned patents and patent applications are installed
and used in the carriage.
-
The internal rear cylinder body 20 of a high noise canceling sound sensor is
inserted into hole 35 of external rear cylinder body 34. The internal main cylinder
bodies of various noise canceling sound sensors are placed in external main cylinder
body 33 and sound wave guiding modules 7 and 7a and sound channels 27 and 27a in
sound wave guiding modules 7 and 7a are placed outside the front sound inlet 4 and rear
sound inlet 4a of internal cylinder body side wall 1.
-
Shockproof spacer 36 and shockproof cushion 37 can be provided between
external main cylinder body 33, internal main cylinder body support 31, sound wave
guiding modules 7 and 7a, internal cylinder body side wall 1, front cover front wall 2
and rear cover rear wall 3 for shockproof isolation. Subject to needs, shockproof spacer
36 can be used or not used between the internal rear cylinder body of electret sound
sensor 20 and the internal wall of internal rear cylinder body insertion hole 35.
-
At the front end and rear end of noise canceling sound sensor inside the external
main cylinder body are provided front sound inlet 4 and rear sound inlet 4a, and front
sound wave guiding module 7 and rear sound wave guiding module 7a are placed
between the front wall of the external front cover and rear wall of the external rear
cover of external main cylinder body and the front cover front wall and rear cover rear
wall of high noise canceling sound sensor inside. The inward openings of the front
sound channel 27 and rear sound channel 27a among them should correspond to the
front and rear sound inlets 4 and 4a on the front cover front wall and rear cover rear wall.
Based on needs, shockproof cushion 37 can be used between the front cover front wall
and rear cover rear wall and front sound wave guiding module 7 and rear sound wave
guiding module 7a of high noise canceling sound sensor. A sound pass hole should be
available on the shockproof cushion.
-
Sound gathering cover 19 can be provided at the front and rear sound inlets of the
external wall of external main cylinder body 33.
-
Figure 12 shows the sectional view of a noise canceling pickup in this invention
and Figures 12A and 12B are the A-A line and B-B line sectional views as shown in
Figure 12. From the comparison between Figure 12, Figure 11 and Figures 11A to 11D
we can see that their difference lies in: The internal main cylinder body and internal rear
cylinder body 20 used from Figures 11A to 11D are changed into a common noise
canceling pickup whose components are placed in a single cylinder body. Outside it is
provided external main cylinder body 33. Sound gathering cover 19 can be installed at
the rear sound inlet at the external side wall of external main cylinder body 33. The
front sound inlet of external main cylinder body is not on side wall but on front cover
front wall. Rear sound wave guiding modules 7a are provided behind external main
cylinder body 33 and the inward opening of their rear sound channel 27a corresponds to
the rear sound inlet 4a on rear cover rear wall 3. Front damping film 5 can be placed
between the front sound inlet of external main cylinder body 33 and the front sound
inlet 4 of internal cylinder body side wall 1, or between the front sound inlet 4 of
internal cylinder body side wall 1 and vibration diaphragm 12. It can also be not used.
Figure 13 shows the sectional view of a noise canceling pickup in this invention and
Figures 13A and 13C are the A-A line, B-B line and C-C line sectional views as shown
in Figure 13. From the comparison between Figure 13 and Figure 11, and Figures 11A
to 11D and Figure 1 and Figures 1A to 1C we can see that their difference lies in:
External main cylinder body 33 and external rear cylinder body 34 are used and various
types of noise canceling sound sensors in this inventor's above-mentioned patents and
patent applications are installed and used in the carriage.
-
The internal rear cylinder body 20 of high noise canceling sound sensor is inserted
into hole 35 of the external rear cylinder body 34, the internal main cylinder bodies of
various noise canceling sound sensors are placed in the external main cylinder body 33
(such as the internal main cylinder body of upper electret sound sensor 29a and the
internal main cylinder body of lower electret sound sensor 30a) and sound wave
guiding modules 7 and 7a and sound channels 27 and 27a in sound wave guiding
modules 7 and 7a are placed outside the front sound inlet 4 and rear sound inlet 4a of
internal cylinder body side wall 1.
-
Shockproof spacer 36 and shockproof cushion 37 can be provided between
external main cylinder body 33, sound wave guiding modules 7 and 7a and the internal
main cylinder body of upper electret sound sensor 29a and the internal main cylinder
body of lower electret sound sensor 30a for shockproof isolation. They can also not be
used.
-
Internal main cylinder body support 31 can be placed between two internal main
cylinder bodies. Sound gathering cover 19 can be installed on the external side wall of
external main cylinder body 33 and at the openings of the front and rear sound inlets 4
and 4a of the various noise canceling sound sensors inside a carriage cylinder body.
Front sound wave guiding module 7 and the front sound channel 27 in sound wave
guiding module 7 are placed between the front sound inlet and rear sound inlet of
external main cylinder body 33, the front cover front wall and rear cover and rear wall
of the various noise canceling sound sensors in external main cylinder body and the
front cover front wall and rear cover rear wall of high noise canceling sound sensor.
Based on needs, shockproof cushion can be used between the front cover front wall and
rear cover rear wall and front sound wave guiding module 7 of high noise canceling
sound sensor. A sound pass hole is provided on the shockproof cushion.
-
Shockproof spacer 36 can be used between the internal rear cylinder body 20 of
electret sound sensor and the internal wall of internal rear cylinder body insertion hole
35 based on needs.
-
Figure 14 shows the sectional view of a noise canceling pickup in this invention
and Figures 14A and 14D are the A-A line, B-B line and C-C line sectional views as
shown in Figure 12. From the comparison between Figure 14 and Figure 11, and
Figures 11A to 11D and Figure 13 and Figures 13A to 13D we can see that their
difference lies in: In the sound sensor used in this embodiment, the rear sound inlet 4c,
rear sound inlet 4, rear damping film fixing sheet 6 and rear damping film 5 on the
internal main cylinder body of upper electret sound sensor 29a and lower electret sound
sensor 30a in main cylinder body are removed. The rear sound wave guiding module 7a
inside external main cylinder body 33 and the rear sound channel 27a in rear sound
wave guiding module 7a and sound gathering cover 19 are also removed. The front
sound inlet 4, front damping film fixing sheet 6 and front damping film 5 in the internal
cylinder body side wall 1 of upper electret sound sensor 29 and the internal cylinder
body side wall 1 of lower electret sound sensor 30 are kept. The sound inlet 4b in front
of the main cylinder body of external main cylinder body 33, the front sound wave
guiding module 7 placed at front wall of the front cover of the various sound sensors
inside external main cylinder body, the front sound channel 27 in the front sound wave
guiding module 7 and the sound gathering cover are also kept to get an assembled high
noise canceling pickup including an external main cylinder body 33 and external rear
cylinder body 34 of the internal cylinder body of non-noise canceling sound sensor,
whose front and rear sound inlets are of the same direction approximately or
perpendicular approximately.
-
Figure 15 shows the sectional view of a noise canceling pickup in this invention
and Figures 15A and 15B are the top view and A-A line of Figure 15.
-
From the comparison between Figure 15 and Figure 14, and Figures 14A and 11B
we can see that their difference lies in: The internal main cylinder body of the upper
electret sound sensor 29a and the internal main cylinder body of the lower electret
sound sensor 30a in the main cylinder body of a non-noise sound sensor are placed side
by side, inlet 4b is provided on the front cover and front wall 2a at the sidewall of
external main cylinder body 33 and sound gathering cover 19 is provided outside the
inlet 4b, with openings facing the same direction. Based on design, internal main
cylinder body support 31 or shockproof spacer 36 can be placed between upper electret
sound sensor 29a and lower electret sound sensor 30a.
The pickup section and electric circuit section which are commonly-used today can
also be placed into the non-noise canceling sound sensor in a main cylinder body to get
a assembled high noise canceling pickup with internal barrel bodies placed one in front
and the other behind, rather than the pickup consisting of main cylinder body and rear
cylinder body as shown in the Figure.
-
Figure 16 shows the sectional view of a noise canceling pickup in this invention
and Figures 16A is the A-A line sectional view as shown in Figure 16. From the
comparison between Figure 16 and Figure 15, and Figures 15A and 15B we can see that
their difference lies in: The internal main cylinder body of the upper electret sound
sensor 29a in the main cylinder body of a non-noise sound sensor is placed facing the
front, inlet 4 is on the front cover and front wall 2 facing the front and sound gathering
cover 19 is outside the inlet 4a on the side wall of external main cylinder body 33
corresponding to the inlet 4 of lower electret sound sensor 30, with the openings of
upper electret sound sensor 29a and upper electret sound sensor 30a facing the same
direction. Based on design, internal main cylinder body support 31 can be placed
between upper electret sound sensor 29a and lower electret sound sensor 30a. The
pickup section and electric circuit section which are commonly-used today can also be
placed into the non-noise canceling sound sensor (the sound sensor as shown in Figure
18) in a main cylinder body to get a assembled high noise canceling pickup with
internal barrel bodies placed one in front and the other behind, rather than the pickup
consisting of main cylinder body and rear cylinder body as shown in the Figure.
-
Figure 17 shows the sectional view of a noise canceling pickup in this invention
and Figure 17A is the A-A line sectional view as shown in Figure 17. From the
comparison between Figure 17 and Figure 15, and Figures 15A and 15B and Figure 16
we can see that their difference lies in: The internal main cylinder body of the lower
electret sound sensor 30a in a main cylinder body is placed facing the front, inlet 4 is on
the front cover and front wall 2 facing the front and sound gathering cover 19 is outside
the inlet 4a on the side wall of corresponding external main cylinder body 33. Rear
sound wave guiding module 7a is placed in front of the inlet 4 of the lower electret
sound sensor 30 in external main cylinder body 33 and rear sound channel 27a of the
rear sound wave guiding module 7a is available between inlet 4a and inlet 4. The
openings of the sound gathering covers 19 of upper electret sound sensor 29 and lower
electret sound sensor 30 face the same direction. Based on design, internal main
cylinder body support 31 can be placed between upper electret sound sensor 29a and
lower electret sound sensor 30a.
-
The pickup section and electric circuit section which are commonly-used today can
also be placed into the non-noise canceling sound sensor (the sound sensor as shown in
Figure 18) in a main cylinder body to get a assembled high noise canceling pickup with
internal barrel bodies placed one in front and the other behind, rather than the pickup
consisting of main cylinder body and rear cylinder body as shown in the Figure.
Likewise, the upper electret sound sensor 29a and lower electret sound sensor 30a can
also be reversed to get a new application.
-
Figure 18 shows the sectional view of a noise canceling pickup in this invention
and Figures 18A and 18B are the A-A line and B-B line sectional views as shown in
Figure 18. From the comparison between Figure 18 and Figure 14, and Figures 14A to
14C and Figure 11 and Figures 11A to 11C we can see that their difference lies in: In the
sound sensor used in this embodiment, the back electrode electrodes 15a in the internal
main cylinder body of upper electret sound sensor 29 and that of lower electret sound
sensor 30 do not enter the back electrode pass hole 28 on back electrode seat 14 to enter
internal rear cylinder body along the side of internal cylinder body, rather they directly
enter the rear of the pickup to connect with impedance conversion electric circuit 21.
Printed electric circuit board 23 is also in internal cylinder body 1 to form front sound
sensor 31a and rear sound sensor 32a. This in fact means the use of noise canceling
sound sensor assembled high noise canceling pickup whose front and rear sound inlets
face approximately the same direction or perpendicular to each other approximately
made of various commonly-used non-noise canceling electret sound sensors.
-
Figure 19 shows the sectional view of a noise canceling pickup in this invention
and Figures 19A to 19C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 19. From the comparison between Figure 19 and Figure 1 and Figures
1A to 1C we can see that their difference lies in: Division plate 9 is placed inside the
internal edge of diaphragm binding ring. Division plate spacer 10 is placed between
vibration diaphragm 12 and division plate 9. In this way, there will be a cavity between
vibration diaphragm 12, division plate 9 and division plate spacer 10 placed in between.
Division plate spacer 10 can also be place at other places based on design, so long as it
can separate 12 and 10 at a certain distance. The distance between 12 and 10 will be
decided by the thickness of 9. Accordingly, the internal edge of back electrode spacer
13 can also be extended inwardly to a place corresponding to the internal edge of 9.
-
The extruding part of sound wave guiding module 7b, the extruding part of front
spacer 8a, extruding part of diaphragm binding ring 11a, extruding part of back
electrode seat 14a and extruding part of back electrode 15a can be used as marks for
positioning, so that the components of the front and rear acoustic channels of vibration
diaphragm can be installed corresponding to each other based on design. Other marks
serving as placement reference can also be used. Positioning mark for a component can
be decided based on needs. The conducting contacts between the diaphragm binding
ring and the casing of the cylinder body of sound sensor can also be moved from front
cylinder body to the casing of rear cylinder body. Its connection with the casing can
either be hard connection through conductive piece or elastic connection through such
elastic conductor as conductive spring lamination 26. This makes the acoustic
structures between the front and rear sound inlets at the sides of vibration diaphragm in
noise canceling sound sensor even the same and symmetrical approximately.
-
Figure 20 shows the sectional view of a noise canceling pickup in this invention
and Figures 20A to 20C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 20. From the comparison between Figure 20 and Figure 1, and Figures
1A to 1C we can see that their difference lies in:
-
Figure 21 shows the sectional view of a noise canceling pickup in this invention
and Figures 21A to 21C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 21. From the comparison between Figure 21 and Figure 1, and Figures
1A to 1 C we can see that their difference lies in: From the comparison between Figures
21 and 20 and Figures 20A and 20C we can see that: Front and rear sound inlets are not
on the side wall of internal cylinder body side wall 1, rather they are on front cover front
wall 2 and rear cover rear wall 3. In this way, there is no need to use the front and rear
sound wave guiding modules 7 and 7a and the front and rear sound channels 27 and 27a
in 7 and 7a. This application can also be used as the modified type for actual production
of various noise canceling pickups in this inventor's patents and patent applications
mentioned above.
-
Figure 22 shows the sectional view of a noise canceling pickup in this invention
and Figures 22A to 22C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 22. From the comparison between Figure 22 and Figure 21, and
Figures 21A to 22C we can see that their difference lies in:
-
Place application No.21 in external cylinder body 33 and external rear cylinder
body 34. The various noise canceling sound sensors and various noise canceling sound
sensors in this inventor's patents and patent applications mentioned above can also be
placed in external cylinder body 33 and external rear cylinder body 34 to get the noise
canceling pickup of this invention.
-
Figure 23 shows the sectional view of a noise canceling pickup in this invention
and Figures 23A to 23C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 23. From the comparison between Figure 23 and Figure 19, and
Figures 19A to 19C we can see that their difference lies in: This is mainly a modified
one for actual production in the applications of this invention. This application can also
be used as a modified type for actual production of the various noise canceling pickups
in this inventor's patents and patent applications.
-
Figure 24a shows the circuit diagram of the sound signal control switch of a noise
canceling pickup in this invention.
-
A sound controlled switch electric circuit as shown in Figure 24a is arranged
between capacitor C10 and NOT gate, analog switches U6 and U5. The low
deformation and low noise sound signals outputted from common mode signal
inhibition electric circuit pass through C10 and the detecting circuit consisting of
diodes D1, D2 and resistance R9, the sound controlled switch electric circuit consisting
of triode T2, capacitors C15, C16 and C17, resistances R14, R15 and R16, NOT gates
U8, U13, U11 and U12, analog switch U10 and R-J trigger U9 to control the control end
13 of U5 so that it opens. Sound signals inputted from input end 1 are outputted from
output end 2 and then pass through NOT gate U4 which is reverse to control the control
end 13 of analog switch U6 so that it closes. Sound signals inputted from input end 1
cannot be outputted from output end 2. In U5 andU6, one is open and another is closed.
On the contrary, when there are no input of sound signals sent out by main sound source,
opening and close are reversed. U5 and U6 opening and closing time can be decided by
capacitor C17 and R16 after a speech is finished (say 10s) to avoid error opening and
closing due to short interruptions during a speech. In this electric circuit, all electric
circuits can use integrated circuits or discrete electric component circuits. Analog
switch electric circuit, digital logic switch electric circuit and other types of electric
circuits which can carry out the functions of the electric circuit can also be used based
on needs.
-
Figure 24b shows the circuit diagram of the sound signal control switch of a noise
canceling pickup in this invention.
-
A sound controlled switch electric circuit as shown in Figure 24b is provided
between capacitor C10 and U4, U6 and U5. Its theory is the same as that of application
24a, only that the sound controlled electric circuit for controlling analog switch adopts
comparator electric circuit. We now make a description of the comparator electric
circuit: The low deformation and low noise sound signals outputted from common
mode signal inhibition electric circuit pass through C10 and the detecting circuit
consisting of diodes D1, D2 and resistance R9, the sound controlled switch electric
circuit consisting of resistances R17, R18, R19 and R120, voltage-regulator diode D3,
diode D4, capacitors C15 and C18, arbitrary electrical level comparator U14 and R-J
trigger U15 to control the control end 13 of analog switch U5 so that it opens. Sound
signals inputted from input end 1 are outputted from output end 2 and then pass through
NOT gate U4 which is reverse to control the control end 13 of analog switch U6 so that
it closes. Sound signals inputted from input end 1 cannot be outputted from output end
2. In U5 and U6, one is open and another is closed. On the contrary, when there are no
input of sound signals sent out by main sound source, opening and close are reversed.
U5 and U6 opening and closing time can be decided by capacitor C18 and R22 after a
speech is finished (say 10s) to avoid error opening and closing of U5 and U6 due to
short interruptions during a speech.
-
Figure 24c shows the circuit diagram of the sound signal control switch of a noise
canceling pickup in this invention.
-
And a sound signal controlled switch electric circuit as shown in Figure 24c is
provided between the above capacitor C10 and C12 and U4, U6 and U5. Its theory is
the same as that of application 24a, only that the sound controlled electric circuit for
controlling analog switch uses the sound signals which have not bee treated for
reduction of environmental noises received by sound sensor and compares with the
sound signals with low environmental noises outputted from common mode signal
inhibition electric circuit before controlling sound controlled switch electric circuit. Its
theory is the same as that of application 13b, only that it adopts lagging comparator.
The low deformation and low noise sound signals outputted from common mode signal
inhibition electric circuit pass through C10 and the detecting circuit consisting of
diodes D1, D2 and resistance R13 and the sound signals from one of the two sound
sensors which have not been treated for reduction of environmental noises pass through
capacitor C12 and the detecting electric circuit consisting of diodes D5 and D6 and
resistance R23 and sound controlled switch electric circuit consisting of resistances
R24, R26, R26 and R22, diode D4, capacitors C15, C19 and C18, lagging comparator
U16 and R-J trigger U15 to control the control end 13 of analog switch U5 so that it
opens. Sound signals inputted from input end 1 are outputted from output end 2 and
then pass through NOT gate U4 which is reverse to control the control end 13 of analog
switch U6 so that it closes. Sound signals inputted from input end 1 cannot be outputted
from output end 2. In U5 and U6, one is open and another is closed. On the contrary,
when there are no input of sound signals sent out by main sound source, opening and
close are reversed. U5 and U6 opening and closing time can be decided by capacitor
C18 and R22 after a speech is finished (say 10s) to avoid error opening and closing of
U5 and U6 due to short interruptions during a speech.
-
The electric circuits in the signal controlled switch electric circuit used in 24a to
24c can use either integrated electric circuits or discrete component electric circuits and
use different comparator electric circuits and trigger electric circuits. Analog electric
circuits, digital electric circuits, operational procedures needed or analog digital
composite electric circuits can be used based on needs, as well as various electric
circuits which can carry out the functions of the entire electric circuit.
Figure 25 shows the electric circuit of a noise canceling pickup for giving off alarms
when receiving distance is exceeded.
-
When the distance between the noise canceling pickup of this invention and main
sound source exceeds a certain range, signals will be greatly attenuated, which may
even affect effective reception. To remind users that the distance between noise
canceling pickup and main sound source exceeds applicable range, this invention
designs an electric circuit of a noise canceling pickup for giving off alarms when
receiving distance is exceeded.
-
When the distance between a noise canceling pickup and main sound source
exceeds an applicable range, the sound wave signals received by noise canceling sound
sensor (different mode signal) will be greatly attenuated and the power of received
sound wave signals will be too low. And it is made based on this theory.
-
This electric circuit is in reality a window comparator electric circuit. If the voltage
of the sound wave signals (single loop different mode signals) received by input single
loop noise canceling sound sensor is between two designated voltages (Upper limit is
the lower limit of designed distance range and lower limit is the upper limit when
distance exceeds designed distance by a certain range), then electric circuit has output
(0V in this example). If output is positive outside this window, two comparators,
namely, U17 and U18, can be used as window voltage comparator. If Vin is more
positive than Vref (high side), U17 output will be positive and is forward bias.
Otherwise, output is negative and U17 is negative bias, thus Vout is 0V. Likewise, if Vin
is more negative than Vref (low side), U18 output will be positive and U18 is positive
bias, then output is positive. Otherwise, Vout is 0V. If Vin is located in the window
established by reference voltage, Vout will be 0V. When window comparator detects
that input voltage is between two designated voltages, it will give off starting signals to
alarming electric circuit U19 and output alarming signal will remind users that the
applicable range of the distance between noise canceling pickup and main sound source
has been exceeded.
-
The single interval electric circuit in the middle of single interval window
comparator electric circuits U17 and U18 can be changed into the window comparator
electric circuit with multiple-interval electric circuits. Some of the intervals can adjust
the amplification coefficient of amplifier based on the intensity of sound signals
received to constitute an automatic gain control electric circuit using comparator
electric circuit, and/ or some other intervals can adjust alarming electric circuit (either
single step alarming electric circuit or multiple-step one) based on reception distance.
Other automatic gain control electric circuits and alarming electric circuits can also be
used.
-
In this application, comparator electric circuit can be MC14574 comparator or
comparators of other models and types. And the comparator electric circuit can use
window comparator, other types of comparator electric circuits or others consisting of
transistor, operational amplifier, comparator or digital electric circuit. It can use
integrated electric circuit, discrete component electric circuit, various types of
comparator electric circuit and trigger electric circuit. Analog electric circuits, digital
electric circuits, operational procedures needed or analog digital composite electric
circuits can be used based on needs, as well as various electric circuits which can carry
out the functions of the entire electric circuit.
-
Figure 10 shows the sectional view of a noise canceling pickup in this invention
and Figure 10A is the A-A line sectional view as shown in Figure 10.
From the comparison between Figure 10, Figure 7 and Figures 7A to 7B and Figure 9
we can see that their difference lies in: The direction of the internal main cylinder body
of the lower electret sound sensor 30 of the main cylinder body of non-noise sound
sensor is changed to facing the front, inlet 4 is on the front cover and front wall 2 facing
the front and sound gathering cover 19 is outside the inlet 4a at the side of the internal
main cylinder body of lower electret sound sensor 30, with opening facing the same
direction as the sound gathering cover 19 of upper eletret sound sensor 29. Based on
design, internal main cylinder body support 31 can be placed between upper electret
sound sensor 29 and lower electret sound sensor 30, rear sound wave guiding module
7a can be placed in front of the inlet 4 of lower electret sound sensor 30 and rear sound
channel 27a of rear sound wave guiding module 7a is available between inlets 4a and 4.
It can be made into one single main cylinder body or two main cylinder bodies
separately. The pickup section and electric circuit section which are commonly-used
today can also be placed into the non-noise canceling sound sensor structure (the sound
sensor structure as shown in Figure 18) of a main cylinder body to form a assembled
high noise canceling pickup with internal barrel bodies placed one in front and the other
behind, rather than the pickup consisting of main cylinder body and internal rear
cylinder body as shown in the Figure. Likewise, the upper electret sound sensor 29 and
lower electret sound sensor 30 can also b reversed to get a new application.
-
Based on design, the internal main cylinder bodies of the upper electret sound
sensor 29 and lower electret sound sensor 30 as shown from Figures 5 to 10 can also be
designed into two separate main cylinder body casings or a shared internal main
cylinder body casing. The internal main cylinder body of the original upper electret
sound sensor 29 and the components inside lower electret sound sensor 30 are placed at
the front and back inside the shared internal main cylinder body casing, between which
internal main cylinder body support 31 inside the shared internal main cylinder body
casing is placed for isolation, which can both have the effect of isolating sound waves
and keeping the front and rear sound reception sections at a certain distance, as well as
connection and supporting functions. Subject to needs, the internal main cylinder body
support 31, the rear sound wave guiding module of front sound sensor 7a and the front
sound wave guiding module of rear sound sensor 7 can be integrated or separated. The
internal main cylinder body support 31 can either use materials with sound wave
impedance or other materials and can be designed into various appropriate shapes
based on needs.
-
Figure 11 shows the sectional view of a noise canceling pickup in this invention
and Figures 11A and 11C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 11. From the comparison between Figure 11, Figure 1 and Figures 1A
to 1C we can see that their difference lies in: External main cylinder body 33 and
external rear cylinder body 34 are used and various types of noise canceling sound
sensors in this inventor's above-mentioned patents and patent applications are installed
and used in the carriage.
-
The internal rear cylinder body 20 of high noise canceling sound sensor and the
internal rear cylinder body inserted into external rear cylinder body 34 are inserted into
hole 35, the internal main cylinder bodies of various noise canceling sound sensors are
placed in the front and at the back of external main cylinder body 33 and sound wave
guiding modules 7 and 7a and sound channels 27 and 27a in sound wave guiding
modules 7 and 7a are placed outside the front sound inlet 4 and rear sound inlet 4a of
internal cylinder body side wall 1.
-
Shockproof spacer 36 and shockproof cushion 37 can be provided between
external main cylinder body 33, internal main cylinder body support 31, sound wave
guiding modules 7 and 7a, internal cylinder body side wall 1, front cover front wall 2
and rear cover rear wall 3 for shockproof isolation. Subject to needs, shockproof spacer
36 can either be used or not used between the internal rear cylinder body of electret
sound sensor 20 and the internal wall of internal rear cylinder body insertion hole 35.
At the front end and rear end of noise canceling sound sensor inside external main
cylinder body are available front sound inlet 4 and rear sound inlet 4a and front sound
wave guiding module 7 and rear sound wave guiding module 7a are placed between the
front wall of the external front cover and rear wall of the external rear cover of external
main cylinder body and the front cover front wall and rear cover rear wall of high noise
canceling sound sensor inside. The inward openings of the front sound channel 27 and
rear sound channel 27a among them should correspond to the front and rear sound
inlets 4 and 4a on the front cover front wall and rear cover rear wall. Based on needs,
shockproof cushion 37 can be used between the front cover front wall and rear cover
rear wall and front sound wave guiding module 7 and rear sound wave guiding module
7a of high noise canceling sound sensor. A sound pass hole should be available on the
shockproof cushion.
-
Sound gathering cover 19 can be provided at the front and rear sound inlets of the
external wall of external main cylinder body 33.
-
Figure 12 shows the sectional view of a noise canceling pickup in this invention
and Figures 12A and 12B are the A-A line and B-B line sectional views as shown in
Figure 12. From the comparison between Figure 12, Figure 11 and Figures 11A to 11D
we can see that their difference lies in: The internal main cylinder body and internal rear
cylinder body 20 used from Figures 11A to 11D are changed into a common noise
canceling pickup whose all component are placed in a single cylinder body. Outside it is
provided external main cylinder body 33. Sound gathering cover 19 can be installed at
the rear sound inlet at the external side wall of external main cylinder body 33. The
front sound inlet of external main cylinder body is not on side wall but on front cover
front wall. Rear sound wave guiding modules 7a are available behind external main
cylinder body 33 and the inward opening of their rear sound channel 27a corresponds to
the rear sound inlet 4a on rear cover rear wall 3. Front damping film 5 can be placed
between the front sound inlet of external main cylinder body 33 and the front sound
inlet 4 of internal cylinder body side wall 1, or between the front sound inlet 4 of
internal cylinder body side wall 1 and vibration diaphragm 12. It can also be not used.
Figure 13 shows the sectional view of a noise canceling pickup in this invention and
Figures 13A and 13C are the A-A line, B-B line and C-C line sectional views as shown
in Figure 13. From the comparison between Figure 13 and Figure 11, and Figures 11A
to 11D and Figure 1 and Figures 1A to 1C we can see that their difference lies in:
External main cylinder body 33 and external rear cylinder body 34 are used and various
types of noise canceling sound sensors in this inventor's above-mentioned patents and
patent applications are installed and used in the carriage.
-
The internal rear cylinder body 20 of high noise canceling sound sensor and the
internal rear cylinder body inserted into external rear cylinder body 34 are inserted into
hole 35, the internal main cylinder bodies of various noise canceling sound sensors are
placed in the front and at the back of external main cylinder body 33 (such as the
internal main cylinder body of upper electret sound sensor 29a and the internal main
cylinder body of lower electret sound sensor 30a) and sound wave guiding modules 7
and 7a and sound channels 27 and 27a in sound wave guiding modules 7 and 7a are
placed outside the front sound inlet 4 and rear sound inlet 4a of internal cylinder body
side wall 1.
-
Shockproof spacer 36 and shockproof cushion 37 can be provided between
external main cylinder body 33, sound wave guiding modules 7 and 7a and the internal
main cylinder body of upper electret sound sensor 29a and the internal main cylinder
body of lower electret sound sensor 30a for shockproof isolation. They can also not be
used.
-
Internal main cylinder body support 31 can be placed between two internal main
cylinder body. Sound gathering cover 19 can be installed on the external side wall of
external main cylinder body 33 and at the openings of the front and rear sound inlets 4
and 4a of the various noise canceling sound sensors inside carriage cylinder body. Front
sound wave guiding module 7 and the front sound channel 27 in sound wave guiding
module 7 are placed between the front sound inlet and rear sound inlet of external main
cylinder body 33, the front cover front wall and rear cover and rear wall of the various
noise canceling sound sensors in external main cylinder body and the front cover front
wall and rear cover rear wall of high noise canceling sound sensor. Based on needs,
shockproof cushion can be used between the front cover front wall and rear cover rear
wall and front sound wave guiding module 7 of high noise canceling sound sensor. A
sound pass hole should be available on the shockproof cushion.
-
Shockproof spacer 36 can be used between the internal rear cylinder body 20 of
electret sound sensor and the internal wall of internal rear cylinder body insertion hole
35 based on needs.
-
Figure 14 shows the sectional view of a noise canceling pickup in this invention
and Figures 14A and 14D are the A-A line, B-B line and C-C line sectional views as
shown in Figure 12. From the comparison between Figure 14 and Figure 11, and
Figures 11A to 11D and Figure 13 and Figures 13A to 13D we can see that their
difference lies in: In the sound sensor used, the rear sound inlet 4c, rear sound inlet 4,
rear damping film fixing sheet 6 and rear damping film 5 on the internal main cylinder
body of upper electret sound sensor 29a and that of lower electret sound sensor 30a in
main cylinder body are removed. The rear sound wave guiding module 7a inside
external main cylinder body 33 and the rear sound channel 27a in rear sound wave
guiding module 7a and sound gathering cover 19 are also removed. The front sound
inlet 4, front damping film fixing sheet 6 and front damping film 5 in the internal
cylinder body side wall 1 of upper electret sound sensor 29 and the internal cylinder
body side wall 1 of lower electret sound sensor 30 are kept. The inlet 4b in front of the
main cylinder body of external main cylinder body 33, the front sound wave guiding
module 7 placed at the front cover and front wall of the various sound sensors inside
external main cylinder body, the front sound channel 27 and sound gathering cover in
the front sound wave guiding module 7 are also kept to get a noise canceling pickup
assembled high noise canceling pickup consisting of an external main cylinder body 33
and external rear cylinder body 34 of the internal cylinder body of non-noise canceling
sound sensor, whose front and rear sound inlets are of the same direction approximately
or perpendicular approximately.
-
Figure 15 shows the sectional view of a noise canceling pickup in this invention
and Figures 15A and 15B are the top view and A-A line of Figure 15.
-
From the comparison between Figure 15 and Figure 14, and Figures 14A and 11B
we can see that their difference lies in: The internal main cylinder body of the upper
electret sound sensor 29a and the internal main cylinder body of the lower electret
sound sensor 30a of the main cylinder body of non-noise sound sensor are placed at
side direction, inlet 4b is on the front cover and front wall 2a at the side of external main
cylinder body 33 and sound gathering cover 19 is outside the inlet 4b, with opening
facing the same direction. Based on design, internal main cylinder body support 31 or
shockproof spacer 36 can be placed between upper electret sound sensor 29a and lower
electret sound sensor 30a.
-
The pickup section and electric circuit section which are commonly-used today can
also be placed into the non-noise canceling sound sensor in a main cylinder body to get
a assembled high noise canceling pickup with internal barrel bodies placed one in front
and the other behind, rather than the pickup consisting of main cylinder body and rear
cylinder body as shown in the Figure.
-
Figure 16 shows the sectional view of a noise canceling pickup in this invention
and Figures 16A is the A-A line sectional view as shown in Figure 16. From the
comparison between Figure 16 and Figure 15, and Figures 15A and 15B we can see that
their difference lies in: The internal main cylinder body of the upper electret sound
sensor 29a of the main cylinder body of non-noise sound sensor is placed facing the
front, inlet 4 is on the front cover and front wall 2 facing the front and sound gathering
cover 19 is outside the inlet 4a on the side wall of external main cylinder body 33
corresponding to the inlet 4 of lower electret sound sensor 30, with the openings of
upper electret sound sensor 29a and upper electret sound sensor 30a facing the same
direction. Based on design, internal main cylinder body support 31 can be placed
between upper electret sound sensor 29a and lower electret sound sensor 30a. The
pickup section and electric circuit section which are commonly-used today can also be
placed into the non-noise canceling sound sensor (the sound sensor as shown in Figure
18) in a main cylinder body to get a assembled high noise canceling pickup with
internal barrel bodies placed one in front and the other behind, rather than the pickup
consisting of main cylinder body and rear cylinder body as shown in the Figure.
-
Figure 17 shows the sectional view of a noise canceling pickup in this invention
and Figure 17A is the A-A line sectional view as shown in Figure 17. From the
comparison between Figure 17 and Figure 15, and Figures 15A and 15B and Figure 16
we can see that their difference lies in: The internal main cylinder body of the lower
electret sound sensor 30a of the main cylinder body of non-noise sound sensor is placed
facing the front, inlet 4 is on the front cover and front wall 2 facing the front and sound
gathering cover 19 is outside the inlet 4a on the side wall of corresponding external
main cylinder body 33. Rear sound wave guiding module 7a is placed in front of the
inlet 4 of the lower electret sound sensor 30 in external main cylinder body 33 and rear
sound channel 27a of the rear sound wave guiding module 7a is available between inlet
4a and inlet 4. The openings of the sound gathering covers 19 of upper electret sound
sensor 29 and lower electret sound sensor 30 face the same direction. Based on design,
internal main cylinder body support 31 can be placed between upper electret sound
sensor 29a and lower electret sound sensor 30a.
-
The pickup section and electric circuit section which are commonly-used today can
also be placed into the non-noise canceling sound sensor (the sound sensor as shown in
Figure 18) in a main cylinder body to get a assembled high noise canceling pickup with
internal barrel bodies placed one in front and the other behind, rather than the pickup
consisting of main cylinder body and rear cylinder body as shown in the Figure.
Likewise, the upper electret sound sensor 29a and lower electret sound sensor 30a can
also be reversed to get a new application.
-
Figure 18 shows the sectional view of a noise canceling pickup in this invention
and Figures 17 and 18B are the A-A line and B-B line sectional views as shown in
Figure 18. From the comparison between Figure 18 and Figure 14, and Figures 14A to
14C and Figure 11 and Figures 11A to 11 C we can see that their difference lies in: In the
sound sensor used, the back electrode electrodes 15a in the internal main cylinder body
of upper electret sound sensor 29 and that of lower electret sound sensor 30 do not enter
the back electrode pass hole 28 on back electrode seat 14 to enter internal rear cylinder
body along the side of internal cylinder body, rather they directly enter the rear of
pickup to connect with impedance conversion electric circuit 21. Printed electric circuit
board 23 is also Internal cylinder body 1 to form front sound sensor 31a and rear sound
sensor 32a. This in fact means the use of noise canceling sound sensor assembled high
noise canceling pickup whose front and rear sound inlets face approximately the same
direction or perpendicular to each other approximately made of various
commonly-used non-noise canceling electret sound sensors.
-
Figure 19 shows the sectional view of a noise canceling pickup in this invention
and Figures 19A to 19C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 19. From the comparison between Figure 19 and Figure 1 and Figures
1A to 1C we can see that their difference lies in: Division plate 9 is placed inside the
internal edge of diaphragm binding ring. Division plate spacer 10 is placed between
vibration diaphragm 12 and division plate 9. In this way, there will be a cavity between
vibration diaphragm 12, division plate 9 and division plate spacer 10 placed in between.
Division plate spacer 10 can also be place at other places based on design, so long as it
can separate vibration diaphragm 12 and division plate 9 at a certain distance. The
distance between vibration diaphragm 12 and division plate 9 will be decided by the
thickness of division plate spacer 10. Accordingly, the internal edge of back electrode
spacer 13 can also be extended inwardly to a place corresponding to the internal edge of
division plate spacer 10.
-
The extruding part of sound wave guiding module 7b, the extruding part of front
spacer 8a, extruding part of diaphragm binding ring 11a, extruding part of back
electrode seat 14a and extruding part of back electrode 15a can be used as marks for
positioning, so that the components of the front and rear acoustic channels of the
vibration diaphragm can be installed corresponding to each other based on design.
Other marks serving as positioning reference can also be used. Positioning mark for a
component can be decided based on needs. The conducting contact between the
diaphragm binding ring and the casing of the cylinder body of a sound sensor can also
be moved from front cylinder body to the shell of rear cylinder body. The connection
with the shell can be hard connection through conductive piece or elastic connection
through an elastic conductor such as conductive spring lamination 26. This makes the
acoustic structures between the front and rear sound inlets at the sides of vibration
diaphragm in noise canceling sound sensor roughly the same and symmetrical.
-
Figure 20 shows the sectional view of a noise canceling pickup in this invention
and Figures 20A to 20C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 20. From the comparison between Figure 20 and Figure 1, and Figures
1A to 1C we can see the differences.
Figure 21 shows the sectional view of a noise canceling pickup in this invention and
Figures 21 A to 21 C are the A-A line, B-B line and C-C line sectional views as shown in
Figure 21. From the comparison between Figure 21 and Figure 1, and Figures 1A to 1C
we can see that their difference lies in: From the comparison between Figures 21 and 20
and Figures 20A and 20C we can see that: Front and rear sound inlets are not on the side
wall of internal cylinder body side wall 1, rather they are on front cover 2 and rear cover
3. In this way, there is no need to use the front and rear sound wave guiding modules 7
and 7a and the front and rear sound channels 27 and 27a in 7 and 7a. This application
can also be used as the modified type for actual production of various noise canceling
pickups in this inventor's patents and patent applications mentioned above.
-
Figure 22 shows the sectional view of a noise canceling pickup in this invention
and Figures 22A to 22C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 22. From the comparison between Figure 22 and Figure 21, and
Figures 21A to 22C we can see that their difference lies in:
-
The structure of embodiment 21 is placed in external cylinder body 33 and external
rear cylinder body 34. The various noise canceling sound sensors and various noise
canceling sound sensors in this inventor's patents and patent applications mentioned
above can also be placed in external cylinder body 33 and external rear cylinder body
34 to get the noise canceling pickup of this invention.
-
Figure 23 shows the sectional view of a noise canceling pickup in this invention
and Figures 23A to 23C are the A-A line, B-B line and C-C line sectional views as
shown in Figure 23. From the comparison between Figure 23 and Figure 19, and
Figures 19A to 19C we can see that their difference lies in: This is mainly a modified
version of various embodiments of this invention for large scale production. This
application can also be used as a modified type for the production of the various noise
canceling pickups in this inventor's patents and patent applications.
-
Figure 24a shows the circuit diagram of the sound signal control switch of a noise
canceling pickup in this invention.
-
A sound controlled switch electric circuit as shown in Figure 24a is arranged
between capacitor C10 and NOT gate U4, analog switches U6 and U5. The low
deformation and low noise sound signals outputted from a common mode signal
inhibition electric circuit pass through C10 and the detecting circuit having diodes D1
and D2, and the sound controlled switch electric circuit which comprises triode T2,
capacitors C15, C16 and C17, resistances R14, R15 and R16, NOT gates U8, U13, U11
and U12, analog switch U10 and R-J trigger U9 to control the control end 13 of U5 so
that it opens. Sound signals inputted from input end 1 are outputted from output end 2
and then pass through NOT gate U4 which is reversed to control the control end 13 of
analog switch U6 so that it closes. Sound signals inputted from input end 1 cannot be
outputted from output end 2. In U5 andU6, one is open and another is closed. On the
contrary, when there are no input of sound signals sent out by main sound source,
opening and close are reversed. U5 and U6 opening and closing time can be decided by
capacitor C17 and R16 after a speech is finished (say 10s) to avoid error opening and
closing due to short interruptions during a speech. In this electric circuit, all electric
circuits can use integrated circuits or discrete electric component circuits. Analog
switch electric circuit, digital logic switch electric circuit and other types of electric
circuits which can carry out the functions of the electric circuit can also be used based
on needs.
-
Figure 24b shows the circuit diagram of the sound signal control switch of a noise
canceling pickup in this invention.
-
A sound controlled switch electric circuit as shown in Figure 24b is provided
between capacitor C10 and U4, U6 and U5. Its theory is the same as that of the
embodiment shown in Figure 24a, only that the sound controlled electric circuit for
controlling analog switch adopts comparator electric circuit. We now make a
description of the comparator electric circuit: The low deformation and low noise
sound signals outputted from a common mode signal inhibition electric circuit pass
through C10 and the detecting circuit having diodes D1 and D2, and the sound
controlled switch electric circuit which comprises resistances R17, R18, R19 and R20,
voltage-regulator diode D3, diode D4, capacitors C15 and C18, arbitrary electrical
level comparator U14 and R-J trigger U15, and control the control end 13 of analog
switch U5 so that it opens. Sound signals inputted from input end 1 are outputted from
output end 2 and then pass through NOT gate U4 which is reversed to control the
control end 13 of analog switch U6 so that it closes. Sound signals inputted from input
end 1 cannot be outputted from output end 2. In U5 and U6, one is open and another is
closed. On the contrary, when there are no input of sound signals sent out by main
sound source, opening and close are reversed. U5 and U6 opening and closing time can
be decided by capacitor C18 and R22 after a speech is finished (say 10s) to avoid error
opening and closing of U5 and U6 due to short interruptions during a speech.
-
Figure 24c shows the circuit diagram of the sound signal control switch of a noise
canceling pickup in this invention.
-
And a sound signal controlled switch electric circuit as shown in Figure 24c is
provided between the above capacitor C10 and C12 and U4, U6 and U5. Its theory is
the same as that of the embodiment shown in Figure 24a, only that the sound controlled
electric circuit for controlling analog switch uses the sound signals which have not been
treated for reduction of environmental noises received by sound sensor and compares
with the sound signals with low environmental noises outputted from common mode
signal inhibition electric circuit before controlling sound controlled switch electric
circuit. Its theory is the same as that of embodiment 13b, only that it adopts lagging
comparator. The low deformation and low noise sound signals outputted from common
mode signal inhibition electric circuit pass through C10 and the detecting circuit
comprising diodes D1, D2 and resistance R13 and the sound signals from one of the
two sound sensors which have not been treated for reduction of environmental noises
pass through capacitor C12 and the detecting electric circuit comprising diodes D5 and
D6 and resistance R23 and sound controlled switch electric circuit comprising
resistances R24, R26, R26 and R22, diode D4, capacitors C15, C19 and C18, lagging
comparator U16 and R-J trigger U15 to control the control end 13 of analog switch U5
so that it opens. Sound signals inputted from input end 1 are outputted from output end
2 and then pass through NOT gate U4 which is reversed to control the control end 13 of
analog switch U6 so that it closes. Sound signals inputted from input end 1 cannot be
outputted from output end 2. In U5 and U6, one is open and another is closed. On the
contrary, when there are no input of sound signals sent out by main sound source,
opening and close are reversed. U5 and U6 opening and closing time can be decided by
capacitor C18 and R22 after a speech is finished (say 10s) to avoid error opening and
closing of U5 and U6 due to short interruptions during a speech.
-
The electric circuits in the signal controlled switch electric circuit used in 24a to
24c can use either integrated electric circuits or discrete component electric circuits and
use different comparator electric circuits and trigger electric circuits. Analog electric
circuits, digital electric circuits, operational procedures needed or analog digital
composite electric circuits can be used based on needs, as well as various electric
circuits which can carry out the functions of the entire electric circuit.
-
Figure 25 shows the electric circuit of a noise canceling pickup for giving off
alarms when receiving distance is exceeded.
-
When the distance between the noise canceling pickup of this invention and main
sound source exceeds a certain range, signals will be greatly attenuated, which may
affect effective reception. To remind users that the distance between the noise canceling
pickup and the main sound source exceeds applicable range, this invention designs an
electric circuit of a noise canceling pickup for giving off alarms when receiving
distance is exceeded.
-
When the distance between a noise canceling pickup and a main sound source
exceeds an applicable range, the sound wave signals received by noise canceling sound
sensor (different mode signal) will be greatly attenuated and the power of received
sound wave signals will be too low.
-
This electric circuit is a window comparator electric circuit. If the voltage of the
sound wave signals (single loop different mode signals) received by input single loop
noise canceling sound sensor is between two designated voltages (Upper limit is the
lower limit of designed distance range and lower limit is the upper limit when distance
exceeds designed distance by a certain range), then electric circuit has output (0V in
this example). If output is positive outside this window, two comparators, namely, U17
and U18, can be used as window voltage comparator. If Vin is more positive than Vref
(high side), U17 output will be positive and is forward bias. Otherwise, output is
negative and U17 is negative bias, thus Vout is 0V. Likewise, if Vin is more negative
than Vref (low side), U18 output will be positive and U18 is positive bias, then output is
positive. Otherwise, Vout is 0V. If Vin is located in the window established by reference
voltage, Vout will be 0V. When window comparator detects that input voltage is
between two designated voltages, it will give off starting signals to alarming electric
circuit U19 and output alarming signal will remind users that the applicable range ofthe
distance between noise canceling pickup and main sound source has been exceeded.
-
The single interval electric circuit in the middle of single interval window
comparator electric circuits U17 and U18 can be changed into the window comparator
electric circuit with multiple-interval electric circuits. Some of the intervals can adjust
the amplification coefficient of amplifier based on the intensity of sound signals
received to constitute an automatic gain control electric circuit using comparator
electric circuit, and/ or some other intervals can adjust alarming electric circuit (either
single step alarming electric circuit or multiple-step one) based on reception distance.
Other automatic gain control electric circuits and alarming electric circuits can also be
used.
-
In this embodiment, comparator electric circuit can be MC14574 comparator or
comparators of other models and types. And the comparator electric circuit can use
window comparator, other types of comparator electric circuits or others having
transistor, operational amplifier, comparator or digital electric circuit. It can use
integrated electric circuit, discrete component electric circuit, various types of
comparator electric circuit and trigger electric circuit. Analog electric circuits, digital
electric circuits, operational procedures needed or analog digital composite electric
circuits can be used based on needs, as well as various electric circuits which can carry
out the functions of the entire electric circuit.
-
Figure 26 shows the sectional view of a noise canceling pickup in this invention
and figures 26A to 26C are the A-A line, B-B line and C-C line sectional views as
shown in figure 26.
-
From the comparison between figure 26 and figure 20, and figures 20A to 20C and
figure 14 and figures 14 A to 14C we can see that their difference lies in: The non-noise
canceling sound sensor used is the same as the noise canceling sound sensor in figure
20 except that the later's division plate spacer 10, front washer 8, division plate 9, rear
sound inlet 4a, rear sound wave guide7a and rear sound channel 27a are removed. This
in reality means that the sound inlet on the front cover front wall of non-noise canceling
sound sensor is moved to the side wall of main cylinder body. Of course, this sound
inlet 4 can also be on the side wall of main cylinder body and front cover front wall at
the same time based on design requirements. In this case, there is no need to leave space
for sound inlet 4a and corresponding inlet passages between the internal main cylinder
body of the upper electret sound sensor 29a inside the external main cylinder body in
figure 14 and the sound inlet 4 on the front cover and front wall 2 of the internal main
cylinder body of lower electret sound sensor 30a. Based on design requirements, main
cylinder body carriage 31 can connect and fix the main barrel bodies of various electret
non-noise sound sensors (such as the main cylinder body of upper electret sound sensor
29 and the main cylinder body of lower electret sound sensor 30). In this figure, a noise
canceling pickup consisting of these two non-noise sound sensors 29 and 30. One or
more of these non-noise sound sensors can be used. The non-noise pickups used by the
various noise canceling sound sensors in this invention can b replaced by non-noise
sound sensor whose sound inlet is moved to the side wall of main cylinder body.
-
Figure 27 shows the sectional view of a noise canceling pickup in this invention
and figures 22A to 22C are the A-A line, B-B line and C-C line sectional views as
shown in figure 22.
-
From the comparison between figure 22 and figure 21, and figures 21 A to 21C we
can see that their difference lies in: The non-noise canceling sound sensor used is the
same as the non-noise canceling sound sensor in figure 26 only that the latter's sound
wave guide 7 and sound channel 27 are taken out. In this figure, a noise canceling
pickup consisting of these three non-noise sound sensors 29, 30 and 30a. One or more
of these non-noise sound sensors can be used. When diaphragm binding ring and the
casing of front cylinder body come into direct contact, conductive piece 26 can also not
be used.
-
Figure 28 shows the sectional view of a noise canceling pickup in this invention
and figures 28A to 28C are the A-A line, B-B line and C-C line sectional views as
shown in figure 28.
-
From the comparison between figure 28 and figure 28, and figures 26A to 26C we
can see that their difference lies in: The several non-noise canceling sound sensors in
this figure are noise canceling sound sensors with their rear cylinder body 20 being
inserted into external rear cylinder body 34.
-
Figure 28 shows the sectional view of a noise canceling pickup in this invention
and figures 28A to 28C are the A-A line, B-B line and C-C line sectional views as
shown in figure 28.
-
Figure 29 shows the sectional view of a noise canceling pickup in this invention
and figures 29A to 29B are the A-A line and B-B line sectional views as shown in figure
29.
-
From the comparison between figure 29 and figure 26, and figures 26A to 26C we
can see that their difference lies in: And the front cover front wall 2 of the sound sensors
inside non-noise canceling sound sensors faces the same direction. One or more of
these non-noise sound sensors can be used.
-
Figure 30 shows the sectional view of a noise canceling pickup in this invention
and figures 30A to 30B are the A-A line and B-B line sectional views as shown in figure
30.
-
From the comparison between figure 30 and figure 29, and figures 29A to 29B we
can see that their difference lies in: The sound wave guide7 and sound channel 27 inside
the non-noise canceling sound sensors in this figure are taken out. And the front cover
front wall 2 of the sound sensors inside the non-noise canceling sound sensors is placed
backward. One or more of these non-noise sound sensors can be used.
-
Based on design requirements, the noise canceling sound sensors and non-noise
canceling sound sensors in the applications of this invention can be used alone or
connected and fixed with each other at a certain interval or space structure to form a
two-dimensional or three-dimensional structure.
-
Figure 31 shows the electric circuit block diagram of a noise canceling pickup in
this invention for giving off alarms when receiving distance is exceeded.
-
When the distance between the noise canceling pickup of this invention and main
sound source exceeds a certain range, signals will be greatly attenuated, which may
even affect effective reception. To remind users that the distance between noise
canceling pickup and main sound source exceeds applicable range, this invention
designs an electric circuit of a noise canceling pickup for giving off alarms when
receiving distance is exceeded.
-
The sound wave difference mode signals received by noise sound sensors having a
certain interval (or noise canceling sound sensors formed by the difference mode
signals extracted by non-noise canceling sound sensors through common mode
rejection electric circuit two by two) are used. A comparison can be made through such
parameter as sound wave signal power between the loops of difference mode signals
received by noise canceling sound sensors to get the approximate relative distance
between microphone and main sound source. When distance is exceeded by a certain
degree, electric circuit, such as trigger electric circuit, will give off alarms. Non-noise
canceling sound sensors can also be used to directly measure the distance between
sound sensor and main sound source to give off alarms. Analog electric circuit, digital
electric circuit or analog and digital combined electric circuit can be used.
-
In this embodiment, non-noise canceling sound sensors are used for measuring
distance and giving off alarms. Non-noise canceling sound sensors 311, 312 and 313
receive environmental noises from outside. The sound signal of 312 and eliminates
common mode signals together with the electric signals of 311 and 313, through
common mode rejection electric circuits 316 and 317 (This in reality means the
formation of two loops of noise canceling sound sensors). Two or more loops of
difference mode signals extracted (sound wave electric signals sent out by the near
main sound source) are compared through window comparator electric circuit 318.
Another loop is compared with reference standards. When the two are at a certain ratio
(Lower limit of upper limit within designed distance and upper limit of lower limit
when designed distance is exceeded by a certain degree), electric circuit has output to
alarming electric circuit 319, which will give off alarms through alarming device 3110.
In this application, three non-noise canceling sound sensors 311, 312 and 313 are used.
Still more can be used. Non-noise canceling sound sensors and noise canceling sound
sensors can also be used together.
-
Figure 32 shows the electric circuit block diagram of a noise canceling pickup in
this invention for giving off alarms when receiving distance is exceeded.
-
It is based on the following theory, namely, comparison of the ratio between the
multi-loop difference mode signals received by noise canceling sound sensors to
calculate the approximate distance between pickup and main sound source and when
their distance exceeds an appropriate range, alarms will be given off. Analog electric
circuit, digital electric circuit or the combination of the two can be used. Noise
canceling sound sensors 321 and 322 receive the sound wave electric signals sent out
by the near main sound source and make a comparison through window comparator
electric circuit 325 together with the electric signals of pre-processing electric circuits
323 and 324, such as vibration compensation electric circuit. Another loop is compared
with reference standards. When the two are at a certain ratio (Lower limit of upper limit
within designed distance and upper limit of lower limit when designed distance is
exceeded by a certain degree), electric circuit has signal output, to actuate alarming
electric circuit 326, which will then give off alarms through alarming device 327. In
this application, two noise canceling sound sensors 321 and 322 are used. Still more can
be used. Besides, non-noise canceling sound sensors and noise canceling sound sensors
can also be used together to form an automatic gain control electric circuit using
comparator electric circuit and (or) alarming electric circuit (single step alarming
electric circuit or multiple step alarming electric circuit), some of whose intervals can
be adjusted based on receiving distance. Other comparator electric circuits can also be
used.
-
In this application, comparator electric circuit can be MC14574 comparator or
comparators of other models and types. And the comparator electric circuit can use
window comparator, other types of comparator electric circuits or others consisting of
transistor, operational amplifier, comparator or digital electric circuit. It can use
integrated electric circuit, discrete component electric circuit, various types of
comparator electric circuit and trigger electric circuit. Analog electric circuits, digital
electric circuits, operational procedures needed or analog digital composite electric
circuits can be used based on needs, as well as various electric circuits which can carry
out the functions of the entire electric circuit.
-
Figures 33a and 33b are the electric circuit block diagram of a digital data
collection common mode rejection system:
-
Details on figures 33a and 33b have been fully disclosed in this inventor's patent
and patent application documents as mentioned above. They won't be detailed here
again.
-
Figure 34 shows the computer flow chart of a noise canceling pickup used in the
pickup of this invention for giving off alarms when receiving distance is exceeded and
adjusting the amplification coefficient of amplifier based on receiving distance.
-
It is based on the following theory, namely, Comparison of the ratio between the
sound difference mode signals received by two noise canceling sound sensors to
determine whether the distance between pickup and main sound source exceeds the
appropriate receiving range of noise canceling pickup. If it is exceeded, alarms will be
given off.
-
When noise canceling sound sensors are used to convert the sound signals received
by noise canceling sound sensors 1, 2...through A/D, the same sound wave electric
signals in the sound signals received by noise canceling sound sensors 1, 2... are
extracted through filter electric circuit. The distance between main sound source and
pickup and (or) their location are calculated by means of calculating the power of two
loops of sound wave signals which are the same and (or) such parameters as time
difference and (or) consultation of tables, which will be compared with the set effective
receiving distance of pickup to decide whether the distance between main sound source
and microphone is within set upper and lower limits. When it is within set upper and
lower limits, the amplification coefficient of amplifier at the distance should be
calculated to see whether the amplifier is at the max. amplification capability. If yes, the
amplification coefficient of the amplifier should be adjusted. When it is beyond the
max. amplification capability of the amplifier, alarms will be actuated and sent out from
D/A. When the distance between the main sound source and microphone is outside the
upper and lower limits of the set distance, nothing will be done further.
-
Of course, the computer program flows of other noise canceling pickups for giving
off alarms when receiving distance is exceeded and adjusting the amplification
coefficient of amplifier based on receiving distance.
-
Figure 35 shows the computer flow chart of a noise canceling pickup among the
pickups of this invention which uses non-noise canceling sound sensor for giving off
alarms when receiving distance is exceeded.
-
When non-noise canceling sound sensors, such as three non-noise canceling sound
sensors, are used to convert the sound signals received by non-noise canceling sound
sensors 1, 2 and 3 through A/D to calculate the difference mode signals between sound
sensors two by two. A comparison can be made among loops of difference mode signals
based on the calculation to roughly calculate the approximate distance between main
sound source and pickup, or the same sound wave electric signals in the sound signals
in two loops of sound sensors can be extracted through filter electric circuit or the same
sound wave electric signals in the sound signals directly picked up by pickups through
filter electric circuit. The accurate distance between main sound source and pickup and
(or) their location are calculated by means of calculating the power of two loops of
sound wave signals which are the same picked up by sound sensors and (or) such
parameters as difference in the time of reaching two sound sensors and (or) consultation
of tables, which will be compared with the set effective receiving distance of pickup to
decide whether the distance between main sound source and microphone is within set
upper and lower limits. When it is within set upper and lower limits, the amplification
coefficient of amplifier at the distance should be calculated to see whether the amplifier
is at the max, amplification capability. If yes, the amplification coefficient of the
amplifier should be adjusted. When it is beyond the max. amplification capability of the
amplifier, alarms will be actuated and sent out from D/A. When the distance between
the main sound source and microphone is outside the upper and lower limits of the set
distance, nothing will be done further.
-
Of course, the computer program flows of other noise canceling pickups for giving
off alarms when receiving distance is exceeded and adjusting the amplification
coefficient of amplifier based on receiving distance.
-
Figure 36 shows the electric circuit of a noise canceling pickup among the pickups
of this invention for giving off alarms when receiving distance is exceeded.
-
It is based on the following theory, namely, the ratio between the sound difference
mode signals received by two loops of noise canceling sound sensors is compared to
roughly determine whether the distance between pickup and main sound source
exceeds the appropriate receiving range of noise canceling pickup.
-
This electric circuit is in reality a window comparator electric circuit with gating
function. The sound source sound difference mode electric signals received by two
loops of noise canceling sound sensors can be pretreated by pretreatment electric circuit
through filtering, time delay, etc., based on design requirements. Pretreatment electric
circuit can also not be used. The sound source sound difference mode electric signals
received by two loops of noise canceling sound sensors pass through the sound
difference mode electric signals Va and Vb. Assume the main sound source sound
electric signal received by the noise canceling sound sensor next to main sound source
is Va and the main sound source sound electric signal received by the noise canceling
sound sensor far away from main sound source is Vb, Va or Vb can be deemed as
reference. Let's assume that Vb is the reference. If the ratio between Va and Vb is
within designated ratio M and N (M is the ratio of upper limit when designed distance is
exceeded by a certain degree and N the ratio of lower limit within designed distance),
then the electric circuit sends out signals to actuate the alarming electric circuit to
amplify Vb signal by M and N times (M and N can either be positive or negative or
integer or non-integer with decimal.) through amplification electric circuits 36A1 and
36A2. Vb enters one of the input poles of operational amplifiers 36A3 and 36A4
respectively and Va enters the other input pole of operational amplifiers 36A3 and
36A4 respectively to make a comparison. When Va is higher than Vb by M time, the
output of 36A3 is positive and that of 36A4 is negative. The output of AND gate 36A5
Vo=0. When Va is lower than Vb by N time, the output of 36A3 is negative and that of
36A4 is positive. The output of AND gate 36A5 Vo=O. When N time of Vb is lower
than Va which is higher than M time of Vb, the output of 36A3 and 36A4 is negative.
The output of AND gate 36A5 Vo=1.
-
Figure 37 shows the process flow of a computer used in the pickups of this
invention for digital elimination noise deciding distance or location.
-
We now make a description of the process flow of noise canceling sound sensor or
non-noise canceling sound sensor for positional reception in this invention which uses
many two-dimensional structures which are arranged in front and in rear,
three-dimensional structures with a certain stereoscopic structure or a
three-dimensional array structure with a certain space array arrangement: When the
sound difference mode signals sent out by the receiving sound source of non-noise
canceling sound sensors are used, difference mode signals between the sound wave
electric signals received by sound sensors two by two can be extracted through digital
common mode rejection or directly treated further without common mode rejection. Or
noise canceling sound sensors can be used directly to receive the difference mode
signals of the sound signals sent out by main sound source and filter each sound wave
of the sound signals and (or) difference mode signals received by one of the sound
sensors through digital filter. Then, a comparison is made of the sound power of each
sound wave with the same wave form in the sound signals received by sound sensors to
calculate such parameters as the ratio and (or) receiving time between the sound wave
electric signals with the same wave form. Based on the distance and (or) location
between sound sensors and the ratio between the sound signals sent out by main sound
source whose distance is actually measured or calculated, we can know the actual
distance and (or) location of the main sound source and pickup which have sent out this
sound wave. We can also employ other calculation and treatment methods to get the
actual distance and (or) location of the main sound source and pickup.
-
Figure 38 shows the window comparator electric circuit with intervals of one of the
noise canceling pickups in this invention which adjusts the amplification coefficient of
amplifier based on the ratio between loops of difference mode signals.
-
A comparison between figure 38 and figure 36 shows that their difference lies in:
Comparator with one interval is adopted in figure 36. This allows amplifier to adjust the
amplification coefficient or attenuation coefficient of amplifier based on the ratio
between difference mode signals (The approximate distance between pickup and sound
source can be obtained based on the ratio between difference mode signals) and
different amplification coefficients can be used based on the ratio between difference
mode signals (adjustment of either amplification coefficient or attenuation coefficient)
to realize automatic gain control electric circuit.
-
It is based on the following theory, namely, calculate the approximate distance
between pickup and main sound source based on the ratio between the difference mode
signals received by noise canceling sound sensors to find out the appropriate
amplification coefficient of the amplifier at this approximate distance. The sound wave
difference mode signals received by noise canceling sound sensors (Noise canceling
sound sensors can also be used from non-noise canceling sound sensors which, two by
two, extracts difference mode signals through common mode rejection electric circuit.)
with a certain interval can be used, comparison can be made of the loops of difference
mode signals received by noise canceling sound sensors through such parameter as
sound wave signal power to get the relative distance between microphone and main
sound source.
-
This electric circuit is in reality a window comparator electric circuit with gating
function. Sound difference mode electric signals Va and Vb are sent out by the sound
source received by two noise canceling sound sensors. Assume the main sound source
sound electric signal received by the noise canceling sound sensor next to sound source
is Va and the main sound source sound electric signal received by the noise canceling
sound sensor far away from main sound source is Vb, Va or Vb can be deemed as
reference. Let's assume that Vb is the reference. If the ratio between Va and Vb is
within designated ratio M and N (M is the ratio of upper limit when designed distance is
exceeded by a certain degree and N the ratio of lower limit within designed distance),
Vb signal can be amplified by M and N times (M and N can either be positive or
negative or integer or non-integer with decimal.) through amplification electric circuits
36A1 and 36A2. In this way, Vb signal can from one voltage sector between M and N
after being amplified by M and N times by amplification electric circuits 36A1 and
36A2. Assume the voltage sector is Vbl and the comparator electric circuit with gating
function and intervals has four intervals and assume 37R3=37R4=37R5=37R6, then
when Va is at 3/4 Vb1 to Vb1, then Voa is high electric level output; when Va is at 1/2
Vb1 to 3/4 Vb1, then Vob is high electric level output; when Va is at 1/4 Vb1 to 1/2 Vb1,
then Voc is high electric level output and when Va is at 0 Vb1 to 1/4 Vb1, then Vod is
high electric level output. Based on design requirements, Voa, Vob, Voc and Vod high
electric level output can be guided by actuating the switch of the amplification
coefficient of one stage or multiple stage analog or digital amplifier. Several alarming
electric circuits can also be actuated or the switch of the different amplification
coefficients of amplifier can be actuated and one or more alarming electric circuits can
be actuated at the same time.
-
The window comparator electric circuit of a noise canceling pickup in this
invention is used. Some intervals can adjust the amplification coefficient and (or)
attenuation coefficient based on receiving distance and (or) other intervals can adjust
alarming electric circuit based on receiving distance (one stage or multiple stage
alarming electric circuit).
Number of gating sectors and intervals and the window voltage of the sectors and
intervals of window comparator electric circuit with gating function and sectors and
intervals can be decided based on design requirements.
-
In the electric circuits of the applications in present invention, comparator electric
circuit can use MC14574 comparator or other comparactors and comparator electric
circuits. AND gate electric circuit can use CD4081. The comparator electric circuit and
AND gate electric circuit can also use other comparactor electric circuit, AND gate
electric circuit and NAND gate electric circuit. They can also use other comparactor
electric circuit, AND gate electric circuit and NAND gate electric circuit consisting of
transistor, operational amplifier, comparator or digital electric circuit, etc. They can use
integrated electric circuit, discrete component electric circuit, comparator electric
circuit, AND gate electric circuit, NAND gate electric circuit or trigger electric circuit,
etc. Different analog electric circuits, digital electric circuits or combination of them
can be used subject to needs, as well as electric circuits which can carry out the
functions of the electric circuit.
-
Figure 39 shows an amplifier electric circuit used by one noise canceling pickup in
the pickups of this invention which can adjust amplification coefficient based on
receiving distance.
-
Noise canceling sound sensors with a two-dimensional structure which are
arranged in front and rear or non-noise canceling sound sensors can be used for noise
canceling reception.
When the Voa, Vob, Voc and Vod, the output ends of the AND gate electric circuits 37a1,
137a12, 37a13 and 37a14 in figure 38 have high electric level output, the input end of
the Voa, Vob, Voc and Vod of analog switch 38a6 are actuated to open a1 to a2, b1 to b2,
c1 to c2 and d1 to d2 to allow amplifier 38A1 different amplification coefficients.
-
Figure 40 shows the sectional view of the noise canceling pickup of this
invention.
-
In comparison of Figure 40 with Figures 22 and 23, it can be seen that the
difference is that the pickup comprises multiple non-anti-noise sound sensors 40a1,
40a2 and noise-canceling sound sensors 40a3 and 40a4. According to design
requirements, it is possible to combine one or more non-anti-noise sound sensors and
one or more anti-noise sound sensors.
-
Figure 41 shows a digital noise-canceling computer program flow chart of this
present invention.
-
A noise-canceling pickup comprising one or more noise-canceling sound
sensors or one or more non-noise-canceling sound sensors outputs multiple sound wave
signals received by noise-canceling sound sensors (multiple differential mode signals).
The noise-canceling treatment procedure is as follows:
- 1. When a sound signal from a main sound source is received by multiple
non-noise-canceling sound sensors, then
- (1) Performing a delaying treatment to a sound wave signal received by one of
twosound sensors 1 and 2, or sound sensors 2 and 3 etc., which sound sensor is closer to
the main sound source. The delaying time is about equal to the time for the sound wave
signal to travel from one sound sensor to the other. Making common-rejection
calculation for every two sound signals received by each pair of sound sensors, or
- (2) Performing a delaying treatment to all of the sound wave signals received
by sound sensors 1, 2, 3, ...except the sound wave signal received by the sound sensor
located farthest from the main sound source. The delaying time is about equal to the
time for the sound wave signal to travel from that corresponding sensor to the farthest
sound sensor. Making common-rejection calculation for every two sound signals
received by each pair of sound sensors. As a result, the distortion of the sound wave
from the main sound source will be minimized.
- 2. (1) Further delaying the differential mode signal received in the above step (1)
by the sound sensor closer to the main sound source. Making second common-rejection
calculation for every two differential -mode signals to obtain a second differential mode
signal, or
- (2) Making common-rejection calculation for every two sound signals
received by each pair of sound sensors in the above step (2) to obtain differential mode
signals. Then making a second common-rejection calculation for every two differential
-mode signals to obtain a second differential mode signal. (The delaying time is that the
sound wave signal goes from a sound sensor to other sound sensor. All the delaying
times are intended to cancel the time difference that the sound wave generated by the
main sound source goes to different sound sensors with different distance from the
main sound source, which may result in distortion of the sound wave).
- (3) Filtering, with a digital filter or other means, two differential -mode sound
signals that is a delaying or a non-delaying signal to output every sound wave of single
mode and/or differential-mode signals in the sound signals received by one and/or
multiple sound sensors. Then performing an acoustic power comparison between sound
waves with the same waveform in the acoustic signals received by multiple sound
sensors, computing acoustic power ratios between the sound waves and/or a difference
between their receiving time, and determining a specific relative distance and/or
direction between the main sound source emitting this acoustic wave and the receiving
pickup according to a ratio table obtained from a comparison between the actually
measured acoustic signal from a sound source in a particular position/direction and a
corresponding one acquired by computation. At that time, it is possible to select a sound
signal, from the sound signals received by one or multiple sound sensors, that is
consistent with the sound signal emitted from the main sound source located at a
predetermined distance from the pickup. It is also possible to select a sound signal from
one or multiple differential-mode signals that is consistent with the sound signal
emitted from the main sound source located at a predetermined distance from the
pickup. Then, memorizing and/or outputting that sound signal according to a
predetermined distance and/or direction. Re- memorizing or processing those final
differential-mode signals and/or sound wave signal generated from the main sound
source. For example, according to the difference between the real frequency-response
curve and required curve for design, adjusting the frequency-response characters of the
sound wave generated by the main sound source, or making common-mode calculation
to the differential -mode signals after amplifying some differential-mode signals and
one sound signal among the sound signals received by sound sensors 1, 2, 3,... to
output a new differential-mode signal and to obtain a sound signal from the main sound
source without environmental noise, which will be further memorized or processed or
output according to design requirements.
-
-
This computer process can be realized not only by digital circuit, but also by
analogous circuit or by composite circuit, which is integrated with analogous circuit
and digital circuit.
-
All the circuits in this present invention, such as the common-mode rejection
circuit and so on, can make use the various circuits in the different patents that I have
been applied and have been opened to the public.
-
Fig. 42 shows a block diagram of a noise-elimination circuit used in the acoustical
pickup in this present invention.
-
It illustrates the anti-noise pickup of the present invention, which comprises
multipath non-anti-noise sound sensors. The following block diagram illustrates the
process of the noise-canceling treatment of the sound wave signals received by
multipath sound sensors in the noise canceling pickup: When several non-anti-noise
sound sensors 42a1, 42a2 and 42a3 are used for reception of a sound signal from a main
sound source, the above steps 1, and 2, can be used, or different sound wave signals
received by sound sensors 42a1, 42a2 and 42a3 can be passed through time-delay
circuits 42a4, 42a5 and 42a6 except one channel sound wave signal picked up by the
sound sensor which is located farthest away from the main sound source among sound
sensors 42a1, 42a2 and 42a3. The delaying time is the time forthe sound wave signal to
travel from different sound sensors closer to the main sound source respectively to the
sound sensor farthest away from the main sound source. The sound wave signal picked
up by the sound sensors in different channels between a pair respectively should be
passed through the common-mode rejection circuits 42a7 and 42a8. Thus, the distortion
of the sound wave send out by the main sound source in the differential-mode signal
can be minimized. The differential-mode signal, which is picked up by the sound sensor
nearer to the main sound source in the multipath differential-mode signal gained in the
above step 1, is passed through the time-delay circuits 42a9 and 42a10 once again; the
double-path differential-mode signal is passed through the common-mode rejection
circuit 42a11, and a differential-mode signal is obtained. Alternatively as mentioned
above in step 2, after the calculation of common-mode rejection between a pair of
signals, multipart differential-mode signals are obtained from the sound wave signals
picked up by the sound sensors in different channels. Once again a differential-mode
signal is obtained when the double-path or multiple-path differential-mode signals are
passed through the common-mode rejection circuit 42a11. (The delayed time is the
time used for the sound wave signal to travel from a sound sensor to another sound
sensor. All the time delay is intended for elimination of the time difference in the
double-path signals caused by the sound wave transmission speed reaching to the front
and back sound sensors. This time difference causes the sonic distortion of the sound
wave (which is sent out by the main sound source) in differential-mode signal during
the common-mode signal is rejected). The regained differential-mode signal is output
and /or other further treatment is conducted, for example, taking one channel from the
sound wave signals which are picked up from the sound sensors 42a1, 42a2 and 42a3,
with the regained differential-mode signal from the amplifying circuit 42a12, then
through common-mode rejection circuit 42a13, the differential-mode signal between
them will be obtained, and also the environmental noise of the sound wave from the
deleted main sound source is also obtained.
-
This block diagram process of noise elimination can be realized with digital circuit
or with composite circuit integrated with analogue circuit and digital circuit as well. For
example, analogue time-delay circuit, CCD time-delay circuit, digital time-delay
circuit, etc. can be used for time delay circuit.
-
Fig. 43 shows the sectional drawing of a kind of noise canceling pickup used in this
present invention, and Fig. 43A is the sectional drawing A-A in Fig.43. In comparison
with Fig.1, Figs.1A∼1C and Figs.21A∼21C from Fig. 43, their differences are: the front
and rear sound inlets 4 and 4a are not provided on the side wall of the outer wall of the
inner cylinder body but on the side wall 2 of the front cover of the main cylinder body
and on the side wall 3 of the rear cover of the main cylinder body (in those examples
mentioned before, the relative position between the main sound source and sound
sensor is a relationship of front and back, therefore they are named as side wall of inner
cylinder body 1, front wall of front cover 2 and rear cover of rear cover 3. Although the
absolute positions of every parts in examples 43, 44 and 45 are not changed, but the
relative positions between the main sound source and the sound sensor is changed,
therefore the names are changed in Examples 43, 44 and 45 as outer wall of cylinder
body 1, side wall of front, cover 2 and side wall of rear cover 3), thus the front and rear
sound wave leading modules 7 and 7a and the front and rear sound pipes 27 and 27a in
7 and 7a, the outer main cylinder body 33 and the outer rear cylinder body 34 are not
used.
-
In Fig. 1, Figs. 1A∼1C and Figs. 21A∼21C, it is similar to the existing noise
canceling pickup, which is on the premises that assume the location of the main sound
source is ahead of the front wall of front cover or is at the rear direction on the rear wall
of rear cover in the sound sensor, and also is at the extension line of the main cylinder
body center line, thus the relative position between the front and rear sound inlet and
the main sound source are one at the front and another one at the rear arranged in a row
of front and rear. In case the location of the main sound source 40 is at the side of the
sound sensor, that is at the periphery of section A-A of the front main cylinder body, the
relative position between the front/rear sound inlets and the main sound source is
arranged in parallel, so as to reach the main sound source in an equal distance
approximately. In the present example, when the main sound source 38 is at the outer
side of the outer wall of the cylinder body 1, the surface 39, which corresponding to the
outer wall of the cylinder body 1 and the main sound source 38, will become actually
the front wall. Place both inlets 4 (one is on the side wall of the main cylinder body
front cover, another is on the side wall of the main cylinder body rear cover), one after
another corresponding to the side wall of the main cylinder body and the corresponding
surface 39 of the main sound source 38. Such as shown in the Figure, the front sound
inlet 4 is at one side of the side wall 2 of the main cylinder body front cover (ahead), the
rear sound inlet 4a is at the location of another side 3 of the main cylinder body rear
cover (rear), vice versa, there is a certain distance difference between front and rear
corresponding to the main sound source. That means that the front and rear sound inlets
are on the side wall of the main cylinder body front cover and on the side wall of the
main cylinder body rear cover respectively in the noise canceling pickup, they are
arranged in a row front and rear at one side of the side wall of the main cylinder body
front cover and at another side of the side wall of the main cylinder body rear cover
corresponding to the direction of the main sound source of the main cylinder body side
wall, and it can be either a single inlet or several inlets.
-
The main sound source 38 in Fig.43A is placed at the location outside the cylinder
body outer wall opposite to the rear cylinder body 20, but is not placed outside of the
outer wall of the cylinder body parallel to the side direction of the rear cylinder body 20.
This shows when the main sound source 38 is different from the relative position of the
outer wall of the cylinder body, the relative position of the front and rear sound inlets
made on the side wall of the main cylinder body front cover and on the side wall of the
main cylinder body rear cover is also different.
-
The specific location of the main sound source on the peripheral of the outer side
surface of the pickup can be determined according to the design. The arrangement of
the direction and the location of the front and rear sound inlets 4 and 4a at the side wall
1 of the main cylinder body front cover and the side wall 3 of the main cylinder body
rear cover as well as the distance difference of the arrangement corresponding to both
main sound sources all can be determined corresponding to the specific location of the
main sound source. The sound collecting cap 19 can be or can be not installed outside
the front and rear sound inlets.
-
A new type of high noise canceling pickup with front and rear sound inlets can be
produced through reformation according to various types of the noise canceling pickup
based on different patents and patent applications of the present inventor. The
orientation of the front and rear sound inlets are roughly the same or perpendicular
roughly to the high noise canceling pickup.
-
Fig. 44 shows a sectional view of a noise canceling pickup which is used in the
present invention, and Fig.44A is a section A-A as shown in Fig.44.
-
In comparison with Fig.1, Figs.1A∼1C, Fig.43 and Fig. 43A from Fig. 44. The
differences are: when the main sound source is at the side surface of the main cylinder
body, the inlets 4 and 4a are not made at the side wall of the outer wall 1 of the inner
cylinder body, but on the side wall 2 of the main cylinder body front cover and on the
side wall 2a of the main cylinder body rear cover in the two sensors 29 and 30 without
noise canceling function parallel to each other. The 2 parallel placed sensors without
noise canceling function corresponding to the front sound inlet 4 at the side wall 2 of
the main cylinder body front cover and the rear sound inlet 4a on the side wall 2a of the
main cylinder body, are arranged in row one after another corresponding to the
orientation of the main sound source of the main cylinder body side wall. For example,
in the drawing, the front sound inlet 4 is at a side (ahead) of the side wall 2 of the main
cylinder body front cover in a sound sensor, the rear sound inlet 4a is another side (rear)
of the side wall 2a of the main cylinder body in a sound sensor, vise versa, there is a
certain distance between the front and the rear corresponding to the main sound source.
That means the front and rear sound inlets at the two noise canceling pickups 29 and 30
are not on a same surface in the different side walls of the main cylinder front cover,
they are arranged one after another with one at one side of the side wall of the main
cylinder body front cover corresponding to the orientation of the main sound source of
the main cylinder body side wall, and at another side of the side wall of the cylinder
body front cover in another sound sensor. The arrangement may be one inlet or several
inlets. In case of several inlets, they can be arranged in parallel location, or formed in a
certain angle, or in rows, or with a certain distance between front and rear. Two sound
sensors can be closely contacted or with a certain distance (with some filling materials
inside).
-
Fig. 45 shows a sectional drawing of a kind of noise canceling pickup used in the
present invention; Fig 45A is section A-A of Fig.45. In comparison with Fig.1, Figs.
1A∼1C, Fig. 43, Fig. 431A, Fig.44 and Fig.45 from Fig.45, the difference are: when the
main sound source is at the side surface of the main cylinder body, the sound inlets 4
and 4a are not made at the side wall of the outer wall 1 of the inner cylinder body, but on
the side wall 2 of the main cylinder body front cover and on the side wall 2a of the main
cylinder body rear cover in the two non-voise0canceling sensors 29 and 30 which are
positioned alternately.
-
The front sound inlet 4 on the side wall 2 of the cylinder body front cover and the
rear sound inlet 4a on the side wall 2a of the cylinder body front cover placed in the two
intersected sensors without noise canceling function, are at a relative centering position
on the side walls of the main cylinder body front wall in the two sound sensors, or
generally at the opening position of the normal inlet in the sound sensor. The location
the inlets in the two sound sensors are roughly the same, it arranged that the two sound
sensors without noise-canceling function are placed in parallel but not totally overlap
with each other, so as to enable the front and rear sound inlets 4 and 4a are placed one
after another facing to the orientation of front end 39 of the side wall in the main
cylinder body of the main sound source 38.
-
As shown in Fig.43, Fig.44 and Fig.45, the new type of high noise canceling
pickup with front and rear sound inlets can be produced through reformation according
to various types of the noise canceling sound pickup based on different patents and
patents applications of the present inventor. The orientation of the front and rear sound
inlets are roughly the same or perpendicular roughly to the high noise canceling pick
up.
-
For example shown in Fig.43, Fig. 44 and Fig.45, although the front and rear sound
inlets are placed at the side wall of the main cylinder body front cover and at the side
wall of the main cylinder body rear cover in the noise canceling pickup that are two
locations at front end and rear end on different surfaces, but in comparison with the end
face 39 of the main sound source directly, the noise canceling pickup is still located on
the side wall of the outer side wall of the noise canceling pickup ( In fact, the pickup
direct facing end face 39 of the main sound source is just the side wall of the main
cylinder body in the pickup, the side wall 2 of the front cover and the side wall 2a of the
rear cover in the main cylinder body are just the outer side wall of the main cylinder
body).
Explanation:
-
- 1. All parts in the present invention can be re-designed either for their internal
structure or for their external form based on the design requirement and practical needs,
such as outer rear cylinder body, rear main cylinder body, inner main body, inner main
cylinder body supporting 31, side wall of inner cylinder body 1, cylinder body 20, rear
cylinder body 20a, sound collecting cap 19, leading modules of front and rear sound
wave 7 and 7a, sound inlets 4 and 4a, sound inlet pipe 27 and 27, baffle plate 9, baffle
plate opening 18, front washer 8, etc. The internal structure can be modified and
re-designed with different combination or dismantlement for different parts and
components. All parts and components can use all the different regular or irregular and
modified shapes: square, rectangle, circular, cylinder, triangle, diamond, polygon, fan,
oval different arcs, such as para-curve, and various curves and geometric function curve,
as well as different basic shapes with a part of their curves. The shape can be also a
complex shape in combination with different basic shapes, or can be a single shape, or
can be a composite body formed with different shapes and single combined shape. The
part can be a whole one or a part of a whole one. The part can be made with metal
material or nonmetal material, or composite material in combination with both
materials. However, the shapes and the location of outer rear cylinder body, outer main
cylinder body, inner main cylinder body, inner main cylinder body support, inner rear
cylinder body and outer cylinder body shall not influence each electret sound sensor.
The electret noise canceling pickup and the unit have the noise canceling effect as same
as the noise canceling pickup with the orientation and perpendicular with each other
roughly the same in the front and rear sound inlets. The parts of inner main cylinder
body, outer main cylinder body, inner main cylinder body support, inner rear cylinder
body, outer cylinder body, etc. can be connected as a whole one or as separate parts with
each other. The whole parts can be used simultaneously or some selected parts can be
used. The inner main cylinder body support 31 can be used to connect several inner
main cylinder bodies in the electret noise canceling sound sensors (such as the inner
main cylinder body of the upper electret sound sensor 29 and the inner main cylinder
body of the upper electret sound sensor 29 and the inner main cylinder body of the
lower electret sound sensor 30) and several outer main cylinder bodies 25 playing a part
in fixing strength. The inner main cylinder body support 31 may be one piece or more
with different shapes, such as cross, ring, disk, hook-like or "-". In the combined type of
noise canceling pickups, the axis (a center line formed by extension of the center line)
of the inner main cylinder body of each electret sound sensor ( such as the inner main
cylinder body of the upper electret sound sensor 29 and the inner main cylinder body of
lower electret sound sensor 30 can be at a same axis or at different axes. The axes can be
paralleled or formed a certain angle each other, when they are at different axes. As the
same as mentioned above, in the present invention, the front and rear sound inlets used
in different sound sensors and the sound collecting cap 19 placed outside the sound
inlet can be placed on a same line or placed on different lines. Both of them can be in
parallel each other or have a certain angle, or parallel to the axis of the side wall 1 of the
inner cylinder body with each other, or formed a certain angle when they are on
different lines. They can be placed on a line parallel to the axis of the sound pickup or
on different lines. When they are placed at different lines, the lines can be in parallel or
have a certain angle each other.
- 2. In the present invention, the orientations of the openings of the front and rear
sound inlets can be roughly the same (or can be different, the angle of the orientations is
about 0° to 135° between two front and rear inlets). The sound collecting cap can be
used to make the initial sound inlet forward to the orientation of the main sound source,
enable the phase of the entering sound wave roughly the same (but can be a difference
in a range of 0°∼135° approximately). (A) By making the acoustic characteristics of two
sound wave channels from two corresponding initial sound inlets (wherein the two
initial sound inlets are corresponding each other and can be located inside either one of
the two inner main cylinder bodies) to vibrating diaphragm roughly the same (but can
be not the same), and through mechanical action, the phase difference of the sound
wave signal between the two channels can be adjusted to about 180° (the phase
difference can also be adjusted to about 0 - 135°), and a better common-mode rejection
effect will be achieved when sound signals act on the vibrating diaphragm, signal
output of the differential -mode signal can be obtained so as to achieve the goal of noise
elimination. (B) By making the acoustic characteristics of two sound wave channels
from two sound inlets to the two sides of the vibrating diaphragm roughly the same and
making the phases of the sound signals roughly the same, (or it can be different, the
phase difference can be in the range of about 0°∼135°), the common-mode rejection can
be carried out to eliminate common-mode signal and pick up differential -mode signal
so as to achieve the effect of noise elimination, wherein the two sound inlets are
corresponding inlets located on the front and rear inner cylinder bodies, respectively.
In the present invention, although the principle and parts of the electret noise
canceling sensor have been used, but other various types of sound sensors can also be
used in the present invention according to design requirement, such as sound sensors
with or without noise canceling function and the principle and parts of various types of
sound sensors. With all these principle and parts, the noise canceling sound sensors and
single type or combined type of high noise canceling sound sensors can be produced as
used in the present invention. The orientations of the front and rear sound inlets used in
these sensors can be almost the same or perpendicular to each other. Various kinds of
existing noise canceling sound sensors and non-anti-noise sound sensors as well as
various components of sound sensors can be used in the present invention, such as: 1.
electromagnetic sound sensors, including: a. electro-dynamic sound sensors, consisting
of moving-coil sound sensors, flat sound sensors, moving-coil sound sensors, etc., b.
electromagnetic sound sensors, etc., c. magnetostrictive sound sensors, etc., 2.
electrostatic sound sensors including: a. electrostatic sound sensors, consisting of
condenser sound sensors, electret sound sensors, electrostatic sound sensors, etc., b.
piezo sound sensors, including those composed of materials such as piezoceramics,
Rochelle salts, crystals, piezo polymers, etc., c. electrostrictive sound sensors,
consisting of electrostrictive sound sensors, bimorph piezo sound sensors, etc., 3.
resistor-transducing sound sensors, including: a. contact impedance sound sensors such
as the granular carbon transmitters, etc., b, impedance-transducing sound sensors,
consisting of resistor-sensing sound sensors, the semiconductor-sensing sound sensors,
etc., 4. photoelectric sound sensors, including: a. phase-varying sound sensors,
consisting of interference sound sensors, DAD sound sensors, etc., b.
light-quantity-varying sound sensors, such as those that perform picking-up by
detecting the light variation reflected from the diaphragm, etc., as well as other sound
sensors that can be equivalently used instead of above mentioned sound sensors and its
components.Every kind of sound sensors and every kind of parts mentioned above can be
exchanged each other for using. For example, in embodiments of present invention on
single noise-canceling sensor, division plate spacer 10, front spacer 8,
diaphragm-stretching ring 11, vibration diaphragm 12 and back electrode 15 in internal
front cylinder can be exchanged for corresponding sound-picking elements or a
complete sound sensor of other kinds of electret sound sensors, condenser sound
sensors, moving-coil sound sensors, electromagnetic sound sensors, piezoceramics
sound sensors, semiconductor-sensing sound sensors. With Every kind of single
existing and new invented non-noise-canceling sensor, the sound sensor elements in the
external front cylinder body 33 and the sidewall of the cylinder body can also be
exchanged for corresponding sound-picking elements or a complete sound sensor of
other kinds of electret sound sensors, condenser sound sensors, moving-coil sound
sensors, electromagnetic sound sensors, piezoceramics sound sensors,
semiconductor-sensing sound sensors. Of cause, the internal structure should be
changed accordingly.Through noise-canceling method of present invention has better
noise-canceling result, but the actual single generated by the main sound source shall be
lower than that of general sound sensor. Therefore, amplifier circuit and/or automatic
gain control circuit should be added. The general amplifier circuit can be used and can
put into the pickup or the outside of the pickup.
- 3. Accord to design requirements, it is possible to combine the signal
noise-canceling sensor or noise-canceling sound-picking-up unit, and/or
noise-canceling sensor or noise-canceling sound-picking-up unit that consist of signal
non-noise-canceling sensor or non-noise-canceling sound-picking-up unit each other to
be multi-pickups with noise-canceling sensor structure or non-noise-canceling sensor
structure of front-back-ranged 2D structure or a 3D structure or a 3D array structure.
When multi-noise sound sensors and/or non-noise-canceling sensors are used
for front-rear-ranged 2D structure, it is an up-down-ranged structure in accompanied
drawings in the manual, and a far-near or front-back relationship for the distance to
main sound source.According to the design requirements, it is possible to use internal front cylinder
body and internal rear cylinder body that are connected each other, or only external font
cylinder body, or only the front wall of the front cover at the front of the shell and the
rear wall of the rear cover at the rear of the shell of the internal front cylinder body and
external front cylinder body, or without the front wall of the front cover at the front of
the shell or only one of them. When only one sound-picking-up unit and sound sensor
in the internal front cylinder body and external front cylinder body, a noise-canceling
sensor element and a noise-canceling sound sensor should be used. In case that multiple
elements of sound sensor and sound sensors are used, either elements of
noise-canceling sound sensor and noise-canceling sound sensor, or elements of
non-noise-canceling sound sensor and non-noise-canceling sound sensor can be used.
Those elements of sound sensor and sound sensors can set in a same internal front
cylinder body and the same external front cylinder body, or put them into the multi
internal cylinder body or multiple external front cylinder body. An internal rear
cylinder body and external rear cylinder body can connect with one or multiple internal
cylinder body/bodies and external cylinder body/bodies. In case multiple sound sensor
units or sound sensors are used, each kind of arrangement or combination for direction
and position of each sound sensor unit or sound sensor, e.g., each sensor can be series or
parallel in connection front and back, can point to the side or to the front or to the back
or to the direction at an angle within 360°. All the sound receiving ends can point to
same direction, or reverse direction, or opposite direction or to side direction, or a
partial to positive direction, other to negative direction or side direction, or to any
direction individually. While the position and the direction of the sound-picking-up
units or sound sensors is/are changed, each front sound inlet or each rear sound inlet on
the front end and the rear end of each electret sound sensor in the internal or external
shell and/or the sound gathering cover corresponding to those sound inlets on the
external sidewall of internal cylinder body and external cylinder body and/or the front
and rear sound guides set around the front and rear sound inlets on internal walls of the
internal cylinder body and the external cylinder body, and front and rear sound channels,
their positions and directions can be changed partially or completely according to
design requirements. Internal rear cylinder body and external rear cylinder body can be
installed any position in the internal front cylinder body and external front cylinder
body if it does not disturb sound wave going into the front sound inlets and the rear
sound inlets. They can point any direction. The relative position between the front
cylinder body and the rear cylinder body can be adjusted correspondingly according to
design requirements.
- 4. Due to limited space, every new embodiment established by re-combining
every parts and circuits listed in the above preferably embodiments of the present
invention can not be described one by one. For example, many new embodiments can
be established by exchanging or combining the internal parts in the support of the
external rear cylinder body, the external front cylinder body, and the internal front
cylinder body, or exchanging or re-combining every kind of sound sensors in present
inventor's prior patents and patent applications or every kind of existing
noise-canceling sound sensors and non- noise-canceling sound sensors, such as electret
sound sensors, condenser sound sensors, moving-coil sound sensors, electromagnetic
sound sensors, piezoceramics sound sensors, semiconductor-sensing sound sensors and
other kinds of noise-canceling sound sensors and non- noise-canceling sound sensors.
Therefore, each kind of embodiments formed by means of re-combining method should
be included in this present invention.
- 5. Internal main cylinder body and external main cylinder body: when the
pickup is divided into two parts of front cylinder body and rear cylinder body as shown
in Figure 1, the front cylinder body is the main cylinder body. If there is no rear cylinder
body and the electric circuits are set in the main cylinder body, that main cylinder body
includes two parts of sound picking-up and electric circuits. The main cylinder body
includes three parts: front wall of main cylinder body facing to main sound source, rear
wall of main cylinder body reversing from main sound source as well as sidewall of
main cylinder body. In each embodiment of pickup as shown in Figure 1 ∼42, sidewall
of main cylinder body is the sidewall 1 of the cylinder body, front wall of main cylinder
body is the front wall of front cover, and rear wall of main cylinder body is the rear wall
of rear cover. In each embodiment of pickup as shown in Figure 43 ∼45, sidewall of
main cylinder body is the sidewall of the front and/or rear cover of the main cylinder
body, front wall of main cylinder body is the sidewall of main cylinder body facing to
main sound source, and rear wall of main cylinder body is the sidewall of main cylinder
body reversing from main sound source. Therefore, in the accompanying Figures, the
front wall of front cover should be named as "sidewall of front cover", the rear wall of
rear cover as "sidewall of rear cover", the sidewall of the cylinder body as "external
wall of the cylinder body".
-
-
This present invention is designed according to the embodiment of electret
high-noise-canceling pickup that consists of electret sound sensor. It can use other kind
of sound sensor to make corresponding kind of noise-canceling pickup. Of course, the
internal structure should be adjusted accordingly.
-
Although the invention has been explained by detailed descriptions of the
preferred embodiments in connection with the accompany drawings as stated above,
the present invention is not limited as the disclosed embodiments. It will not difficult
for those skilled in the art to make various improvements, modifications and
substitutions to the noise-canceling pickup with a combined structure according to the
present invention, in the hints contained in the preferred embodiments within the spirits
and the scope of the present invention, which are only defined by the appended claims.