WO2001063969A1 - An anti-noise pick-up - Google Patents
An anti-noise pick-up Download PDFInfo
- Publication number
- WO2001063969A1 WO2001063969A1 PCT/CN2001/000108 CN0100108W WO0163969A1 WO 2001063969 A1 WO2001063969 A1 WO 2001063969A1 CN 0100108 W CN0100108 W CN 0100108W WO 0163969 A1 WO0163969 A1 WO 0163969A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sound
- noise
- pickup
- main cylinder
- cylinder
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
Definitions
- the present invention relates to a sound pickup, and more particularly to a single and a combination of high-noise pickups with noise-proof pickups whose front and rear sound inlet openings are approximately the same or substantially perpendicular to each other.
- X have disclosed in detail the electret anti-noise pickup and a combination type high anti-noise made on the basis of this pickup
- the pickup has two parts, a main cylinder and a rear cylinder, which are combined with each other.
- As a single anti-noise pickup it already has very good performance. In use, it not only has the characteristics of high signal-to-noise, but also does not lose good resistance in the higher frequency range.
- the noise function meanwhile, enables the microphone to be directly mounted on an external device without a housing, making the structure light and convenient for assembly.
- this single anti-noise electret pickup because its front and rear sound inlets are at two opposite positions of the front cover front wall and the rear cover rear wall of the main cylinder of the pickup, and one sound inlet is directly opposite At the position facing the main sound source, the other is at a position away from the main sound source, so when the pickup is more than 10 cm away from the main sound source, the sound wave arriving at this part is already close to the plane wave, so that the sound wave characteristics reaching the front and rear sound holes Phase The difference is large. Although the thickness of the main cylinder is reduced and the anti-noise effect is greatly improved, the anti-noise characteristics still cannot achieve satisfactory results.
- the current non-noise-resistant electret pickup is because a non-acoustic signal receiving device such as an impedance conversion circuit is directly placed in the pickup, so that its thickness is relatively large.
- the front and rear sound inlets are oriented substantially the same or approximately the same.
- the anti-noise pickups that are perpendicular to each other, when two single anti-noise electret pickups or two single non-noise electret pickups are stacked, because of the anti-noise effect and frequency range and two single pickups
- the distance of the sound receiving end of the main sound source has a direct relationship. The closer the distance is, the stronger the anti-noise effect and the higher the frequency range.
- the thickness of the body can be reduced according to the design needs and the level of the manufacturing process at the time to reduce the thickness of the main cylinder of the sound receiving end to as small as 0.2 to 10 mm or even smaller and thinner, or thicker. .
- the current non-noise-resistant electret pickups are relatively thick, and the sound between two single pickups enters the gap, which makes the distance between the sound receiving ends of the main sound sources of a single two pickups relatively long. To the required performance indicators.
- the current non-noise-resistant electret pickup is because the sound inlet hole is provided on the front wall of the front cover, and the front and rear sound inlets of the present invention have substantially the same orientation or substantially perpendicular to each other.
- a straight anti-noise pickup when two single non-noise-resistant electret pickups are used overlappingly, in order to allow sound waves to enter the sound inlet holes on the front wall of the front cover of the rear pickup, two A sound entry channel is set between the non-noise-resistant electret pickups, resulting in an increase in the distance between the two pickups.
- the pickup of the present invention is to achieve the purpose of eliminating environmental noise by utilizing the difference between the main sound source and the ambient noise sound source and the pickup, it is a sound transmitting device that is very sensitive to the distance between the pickup and the main sound source.
- the sound wave signal from a useful main sound source is rapidly attenuated, so it is necessary to timely issue a warning signal that the pickup is out of the receiving range, and a distance monitoring and amplification factor control circuit that automatically adjusts the amplification factor of the amplifier according to the distance between the two.
- the object of the present invention is to provide an anti-noise pickup with front and rear sound inlets facing approximately the same or substantially perpendicular to each other, so as to overcome the lack of anti-noise capability of a single anti-noise pickup in the prior art in a harsh high noise environment. Defects.
- Another object of the present invention is to provide an anti-noise pickup with the front and rear sound inlets facing approximately the same or substantially perpendicular to each other, in order to easily control the tolerances of parts when the above-mentioned patented products are mass-produced, so that the product qualification rate can be improved.
- Another object of the present invention is to provide a pickup having the present invention.
- Another object of the present invention is to provide a pickup having a sound inlet hole opened on the side wall of a non-noise-resistant pickup, so that the sound inlet hole is opened in the barrel in some cases.
- the side wall is used, for example, when multiple non-noise-resistant pickups arranged in a row are used to form an anti-noise pickup, if the current sound inlet hole is used to open the non-noise-resistant pickup on the front wall of the front cover, the sound can enter the front of the rear pickup
- the sound inlet hole on the front wall of the cover needs to leave a sound inlet channel between the front and rear pickups.
- the sound inlet when used to open a pickup on the side wall of the non-noise-resistant pickup, the sound inlet can be eliminated. , So that the distance between the front and rear sound inlet holes of the anti-noise pickup composed of multiple non-noise-resistant pickups can be shortened. Of course, this kind of non-noise-resistant pickup can also be applied to a variety of other types that need to be used. Non-noise-proof pickup place.
- Another object of the present invention is to provide a device and a device capable of monitoring whether an anti-noise pickup and a main sound source are out of a receiving distance range, and issuing a warning of exceeding the receiving distance range, and automatically adjusting an amplifier amplification factor according to the distance between the two and Circuit.
- an anti-noise pickup which includes a main cylinder and a rear cylinder which are combined with each other, and is characterized in that a forward sound and / or a rear end of a side wall of the main cylinder have forward sounds respectively.
- the hole and the rear sound inlet, the front and rear sound inlets face each other between 0 ° -135 °.
- the outer main cylinder body includes a plurality of anti-noise pickup units and / or non-noise-resistant pickup units, and the front and / or rear ends of the side wall of the main cylinder body respectively have forward sound holes and rear sound holes, and forward and backward sounds.
- the mouths face each other between 0 ° _135 °.
- the forward sound hole and / or the backward sound hole respectively correspond to a corresponding side of the diaphragm.
- the side wall of the main cylinder has forward sound holes, and / or the side wall of the main cylinder has backward sound holes.
- the sound inlet of the pickup is opened on the side wall.
- a sound collecting cover is provided on the outer wall of the main cylinder corresponding to the forward sound hole and / or the backward sound hole.
- a tension membrane ring is provided in the main cylinder body, and a middle portion of the spacer is raised between the front gasket and the spacer gasket in front of the tension ring, and the middle portion of the spacer is raised into the tension ring.
- the edge of the raised part is close to the inner edge of the membrane ring and forms a cavity between the diaphragm and the diaphragm.
- the partition plate in the anti-noise pickup is placed within the inner edge of the stretch membrane ring, and there is a partition gasket between the diaphragm and the partition plate.
- the acoustic structure in the anti-noise pickup from the two sides of the diaphragm to the front and rear sound inlet holes is approximately symmetrical.
- the back pole in the main cylinder is penetrated from the back pole through hole in the back pole seat at the same level as the back pole, and is connected to its circuit part.
- a sound wave guiding module and a sound tube are provided at the positions of the sound inlet holes in the main cylinder.
- the circuit part of the anti-noise pickup is placed in the main cylinder or the rear cylinder.
- the tension in the anti-noise pickup The conductive contact between the membrane ring and the housing of the microphone cylinder is arranged at the position of the rear cylinder.
- it also includes a sound-activated switching circuit, which is composed of a detection circuit, a comparator circuit, and a switching circuit.
- a pickup over-receiving distance alarm circuit is also included, which is composed of a comparator circuit.
- it also includes a control circuit that adjusts the amplification factor of the amplifier according to the reception distance, which is composed of a window comparator circuit having a plurality of sections.
- it also includes a circuit that performs two common mode suppressions of the two differential mode acoustic electric signals received by the pickup through a common mode suppression circuit.
- the front and rear sound inlet holes are respectively provided on the side wall of the front cover of the main cylinder and / or the side wall of the rear cover of the main cylinder, and the direction of the main sound source on the side of the main cylinder is on the front cover of the main cylinder.
- One side of the side wall and the other side of the rear cover side wall of the main cylinder are arranged back and forth, or the direction of the main sound source on the side of the main cylinder is on one side of the front cover side wall of one main cylinder and the other
- the other side of the side wall of the front cover of a main cylinder is arranged back and forth.
- the plurality of main cylinders are staggered, and the front and rear sound inlet holes are respectively provided on the side wall of the front cover of the main cylinder and / or the side wall of the main cover, with respect to the main sound source on the side of the main cylinder.
- the direction is near the center of the side wall of the main cylinder front cover and / or the side wall of the main cylinder rear cover, or the direction of the main sound source on the side of the main cylinder is on the side wall of the main cylinder front cover and / Or the two sides of the side wall of the back cover are arranged back and forth.
- the main advantage of this device is that it has multiple sound entry holes arranged side by side, and at least multiple sound entry holes corresponding to each other.
- the sound inlet openings are oriented approximately the same (the range is 0 0 ⁇ 45 0 ), and is approximately vertical.
- the front and rear sound inlet holes are oriented substantially the same or are approximately perpendicular to each other
- the forward sound hole may be one or more
- the backward sound hole may be one.
- a plurality of forward sound holes and backward sound holes may be opened in front of the front wall of the front cover of the pickup, and the main sound source 38 on the extension line 40 of the center axis of the pickup may have an angle of forward sound holes and a rear sound hole.
- Angle The angles between the angles are compared. The difference between the angles around "0 degrees” is called “the front and rear sound holes are roughly the same.” The difference is about 90 degrees. "Approximately perpendicular to each other”. The difference between the angles of the two front and rear sound inlet holes is approximately between 0 degrees and 130 degrees.
- the noise treatment achieves the purpose of directional positioning reception.
- the anti-noise pickups with the front and rear sound inlets facing the same or substantially perpendicular to each other can be applied to various places where low-noise pickups are needed.
- the problem that the acoustic structure on the front and back sides of the diaphragm in the front cylinder cannot be roughly symmetrical is improved.
- the shape and placement position of the partially raised partition plate 9 were modified.
- the partition plate 9 was placed in a ring shape into the stretch membrane ring 11, and the outer edge of the partition plate 9 was close to the inner edge of the stretch film ring 11.
- the back electrode and the back electrode are made into one body at the same time, and the back electrode is directly led out from the back pole seat to the inner rear cylinder.
- the diaphragm in the front cylinder is The acoustical symmetry of the side is improved and the yield is improved during mass production.
- FIG. 1 is a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 1A to 1C It is a sectional view taken along lines AA, B-B, and CC shown in FIG. 1, respectively.
- Fig. 2 shows a cross-sectional view of an anti-noise pickup of the present invention
- Figs. 2A and 2C are cross-sectional views taken along lines A-A, B-B, and C-C shown in Fig. 2, respectively.
- Fig. 3 shows a cross-sectional view of an anti-noise pickup of the present invention
- Figs. 3A-3C are cross-sectional views taken along lines A-A, B-B, and C-C shown in Fig. 2, respectively.
- FIG. 4 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 4A to 4B are cross-sectional views taken along lines A-A and B-B shown in FIG. 4, respectively.
- Fig. 5 shows a cross-sectional view of an anti-noise pickup of the present invention.
- 5A to 5C are cross-sectional views of lines A-A, B-B, and C-C shown in FIG. 5, respectively.
- Fig. 6 shows a sectional view of an anti-noise pickup according to the present invention.
- 6A to 6B are sectional views taken along lines A-A and B-B shown in FIG. 6, respectively.
- Fig. 7 shows a cross-sectional view of an anti-noise pickup of the present invention.
- 7A to 7B are a top view and a cross-sectional view taken along line A-A of FIG. 7, respectively.
- Fig. 8 shows a cross-sectional view of an anti-noise pickup of the present invention.
- 8A to 8B are cross-sectional views taken along lines A-A and B-B shown in FIG. 8, respectively.
- FIG. 9 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIG. 9A is a cross-sectional view taken along the line A-A shown in FIG. 9.
- Fig. 10 shows a cross-sectional view of an anti-noise pickup of the present invention.
- 10A is a cross-sectional view taken along the line A-A shown in FIG. 10.
- FIG. 11 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 11A to 11C are cross-sectional views respectively taken along lines A-A, B-B, and C-C shown in FIG. 11.
- Fig. 12 shows a cross-sectional view of a noise-proof pickup of the present invention
- Figs. 12A and 12B are cross-sectional views taken along lines A-A and B-B shown in Fig. 12, respectively.
- FIG. 13 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 13A to 13C are cross-sectional views respectively taken along lines A-A, B-B, and C-C shown in FIG. 13.
- FIG. 14 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIG. 14A to FIG. 14C is a sectional view taken along lines AA, BB, and C-C shown in FIG. 14, respectively.
- Fig. 15 shows a cross-sectional view of an anti-noise pickup of the present invention
- Figs. 15A to 15B are a top view and a cross-sectional view taken along the line A-A of Fig. 15, respectively.
- Fig. 16 shows a cross-sectional view of an anti-noise pickup of the present invention.
- 16A is a cross-sectional view taken along the line A-A shown in FIG. 16.
- Fig. 17 is a sectional view showing a noise pickup of the present invention.
- 17A is a cross-sectional view taken along the line A-A shown in FIG. 17.
- FIG. 18 is a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 18A and 18B are cross-sectional views taken along lines A-A and B-B shown in FIG. 14.
- FIG. 19 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 15A to 15B are a top view and a cross-sectional view taken along the line A-A of FIG. 15, respectively.
- Fig. 20 shows a cross-sectional view of an anti-noise pickup of the present invention.
- 16A is a cross-sectional view taken along the line A-A shown in FIG. 16.
- FIG. 21 to 21 are cross-sectional views of a non-noise-resistant pickup used in the present invention
- FIG. 17A is a cross-sectional view taken along the line A-A shown in FIG. 17.
- FIG. 22 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 18A and 18B are cross-sectional views taken along lines A-A and B-B shown in FIG. 14.
- FIG. 23 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 18A and 18B are cross-sectional views taken along lines A-A and B-B shown in FIG. 14.
- Fig. 24a shows a circuit diagram of a sound signal control switch of an anti-noise pickup of the present invention.
- FIG. 24b shows a circuit diagram of a sound signal control switch of an anti-noise pickup of the present invention.
- FIG. 24c shows a circuit diagram of a sound signal control switch of an anti-noise pickup of the present invention.
- FIG. 25 shows an out-of-reception distance report of an anti-noise pickup of the present invention.
- Police circuit
- FIG. 26 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 26A-26C are cross-sectional views taken along lines A-A, B-B, and C-C shown in FIG. 26, respectively.
- FIG. 27 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 22A-22C are cross-sectional views taken along lines A-A, B-B, and C-C shown in FIG. 22, respectively.
- FIG. 28 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 28A-28C are cross-sectional views of lines A-A, B-B, and C-C shown in FIG. 28, respectively.
- FIG. 29 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 29A-29B are cross-sectional views taken along lines A-A and B-B shown in FIG. 29, respectively.
- FIG. 30 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 30A-30B are cross-sectional views taken along lines A-A and B-B shown in FIG. 30, respectively.
- FIG. 31 shows a block diagram of an over-receiving distance alarm circuit of an anti-noise pickup of the present invention.
- FIG. 32 shows a block diagram of an over-receiving distance alarm circuit of an anti-noise pickup of the present invention.
- Figure 33a is a block diagram of a digital data acquisition common mode suppression system
- Figure 33b is a block diagram of a digital data acquisition common mode suppression system
- FIG. 34 shows a flowchart of a computer for over-receiving alarm of an anti-noise pickup used in the pickup of the present invention.
- Fig. 35 shows a flowchart of a non-noise-resistant pickup used in the pickup of the present invention for an over-receiving distance alarm computer.
- Fig. 36 shows an over-receiving distance alarm circuit of an anti-noise pickup used in the pickup of the present invention.
- Fig. 37 shows a digital noise cancellation positioning receiving computer flow used in the pickup of the present invention.
- Fig. 38 is a diagram showing an anti-noise pickup used in the pickup of the present invention.
- a window comparator circuit with a plurality of sections that adjusts the amplification factor of the amplifier according to the reception distance.
- Fig. 39 shows an amplifier circuit of an anti-noise pickup used in the pickup of the present invention to adjust the amplification factor of the amplifier according to the reception distance.
- Fig. 40 shows a cross-sectional view of an anti-noise pickup of the present invention.
- Figure 41 shows the flow of a digital noise canceling computer used in the pickup of the present invention.
- Fig. 42 is a block diagram showing a noise canceling circuit used in the pickup of the present invention.
- FIG. 43 shows a cross-sectional view of an anti-noise pickup used in the present invention
- FIG. 43A is a cross-sectional view taken along the line A-A shown in FIG. 43.
- Fig. 44 shows a cross-sectional view of an anti-noise pickup used in the present invention
- Fig. 44A is a cross-sectional view taken along the line A-A shown in Fig. 44.
- FIG. 45 shows a cross-sectional view of an anti-noise pickup used in the present invention.
- FIG. 1 is a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 1A to 1C are cross-sectional views respectively taken along lines AA, BB, and CC shown in FIG. 1.
- the electret anti-noise pickup of the present invention has a cylindrical shell, which is formed by combining the inner side wall 1 and the inner rear cylinder 20, and the front part of the inner cylinder side wall 1 has a front cover front wall 2 and a rear part.
- the shell can also adopt various other shapes such as a square, a rectangle, an oval, and the like, as required.
- the outer diameter of the inner cylinder side wall 1 can be between 0.2-55 mm, and the height can be between 0.2-50 mm, which can be determined according to the test.
- An anti-noise pickup unit is placed in the main cylinder. This unit can be composed of the following components: First, one or more forward sound holes 4 and rear sound holes are provided at each of the front and rear ends of the inner cylinder side wall 1 of the housing.
- a sound collecting hood 19 is provided on the outer side wall of the inner cylinder side wall 1 corresponding to the front and rear sound inlet holes 4, 4a, and surrounds the inner cylinder
- the inner wall of the forward sound hole 4 and the rear sound hole 4a of the body side wall 1 is provided with a front damping film 5, a rear damping film 5a, and a front damping film pressing sheet 6, a rear damping film pressing sheet 6a. It is placed in the cavity between the damping membrane pressing pieces 6, 6a and the inner cylinder side wall 1.
- This damping membrane can also be placed in the inner main cylinder in other parts before and after the diaphragm, as well as It can be placed outside the sound inlet hole.
- the diaphragm 12 which is close to the spacer gasket 10 and the stretcher ring 11 can be placed near the center position of the side wall 1 of the inner cylinder.
- the diaphragm 12 can also be placed near the front wall of the front cover or the rear according to the design requirements. Cover the position on the back wall.
- a raised spacer 9 is placed in the middle portion, and the intermediate portion of the spacer 9 is raised into the stretcher ring 11, and the edge of the raised portion is A cavity is formed between the diaphragm gasket 10 and the inner edge of the tension membrane ring 11 and the diaphragm 12. In this way, the rear surface of the partition plate 9 is close to the front surface of the diaphragm 12, but there is a certain distance from the front surface of the diaphragm 12.
- the separation distance between the rear surface of the diaphragm 9 and the front surface of the diaphragm 12 and the distance between the rear surface of the diaphragm 12 and the front surface of the back pole 15 may be approximately the same as required.
- the rear surface of the diaphragm 9 and the diaphragm 12 The distance between the front surfaces should be determined by the acoustic characteristics of the front and back sides of the diaphragm 12, so that the time for the sound entering from the sound entry ends of the front and rear sound entrance holes 4, 4a to reach the front and back sides of the diaphragm 12 is approximately equal.
- the acoustic characteristics on both sides of the membrane 12 are approximately the same.
- the front gasket 8, the partition plate 9, and the partition gasket 10 can be made of conductive or non-conductive metal or non-metal material according to the design requirements. If the partition plate 9 is made of a metal material, the partition plate can be made. 9 and the membrane ring 11 are in close contact to conduct electricity, and the two can also be insulated by a non-metal material, and at the same time play a role of making the two in close contact.
- the thickness of the protruding portion of the partition plate 9 is substantially equal to the thickness of the back electrode 15 and may not be equal. In order to make the two thicknesses approximately equal, the front surface of the partition plate 9 may be flat, or may be convex or concave toward the diaphragm 12.
- the shape and thickness of the spacer gasket 10 can also be adjusted according to the principle that the acoustic characteristics on both sides of the diaphragm 12 are approximately the same.
- the shape of the back surface of the back pole facing the rear wall and the spacer 9 facing the front cover can be adjusted.
- the front shape in the direction of the front wall is similar, so that the thickness of the back pole is close to the thickness of the convex portion of the partition plate 9 and so on.
- the size, number, and placement position of the two can be symmetrical to each other or asymmetrical.
- the spacer gasket 10 can be placed between the front of the stretch membrane ring 11 and the edge of the outer non-convex portion of the spacer 9 protruding in the middle part as shown in FIG. 1, or it can be placed within the inner edge of the stretch membrane ring
- a cavity is formed between the diaphragm 12 and the middle convex portion of the partition plate 9, so that a cavity is formed between the diaphragm 12 and the middle convex portion of the partition plate 9 and the inner edge of the partition plate 9 9 can also be placed in other places according to the design requirements, as long as it can play a role in separating the diaphragm 12 and the middle convex portion of the partition 9 from a certain distance, so that the distance between the diaphragm 12 and the partition 9 is determined by The thickness of the spacer gasket 9 is determined.
- the inside edge of the corresponding back electrode spacer washer 13 may also extend inwardly to a position corresponding to the inside edge of the partition pad 9.
- a forward sound hole 4, a rear sound hole 4 a and a front damping film pressing piece 6 and a rear damping film pressing piece 6 a are provided at the front end of the inner cylinder side wall 1 to place a front acoustic wave guiding module 7 and a rear acoustic wave guiding module 7 a.
- front and rear sound pipes 27, 27a in the front and rear sound wave guide modules 7, 7a also can be made into a sound groove, a sound plate Etc.
- the front and rear sound pipes 27, 27a It can also point in other directions according to the design requirements.
- a partition front cavity is formed between the inner surface of the acoustic wave guiding module 7, the inner wall of the front gasket 8, and the front surface of the partition 9 16.
- the diaphragm 12 forms a diaphragm front cavity 17 between the stretch membrane ring 11 provided around the inner wall of the inner cylinder side wall 1 and the rear surface of the partition plate 9, so that sound waves pass through the outer side wall of the inner main cylinder body.
- the condenser cover 19 enters the forward sound hole 4, the front damping 5, the front damping membrane pressing sheet 6, and the sound tube 27 in the sound wave guiding module 7 enters the front cavity 16 of the partition and passes through the partition hole on the partition 9.
- the cavity 18 before entering the diaphragm acts on the diaphragm 12 from the front of the diaphragm 12.
- one or more inner main cylinder rear sound inlet holes 4a are provided at the rear end of the inner cylinder side wall 1 so that sound waves can pass through the main cylinder side wall.
- the outer condenser hood 19 enters the rear entrance hole 4a, the rear damping film 5a, the rear damping film pressing piece 6a, and the rear acoustic tube 27a in the rear acoustic wave guide module 7a.
- the sound wave propagates in the direction of the diaphragm.
- the back pole cavity 16a formed between the back surface of the back pole 15 and the front surface of the acoustic wave guide module 7a and the back surface of the back pole seat 14 passes through the back pole hole 18a in the back pole 15 to the back pole spacer 13.
- the diaphragm 12 acts on the diaphragm 12 from the back of the diaphragm 12.
- the acoustic wave guiding module can be made of metallic materials or non-metallic materials. It can be made of the same material as the damping film tablet, or it can be made of different materials. It can be made in one piece or made of separate pieces. Can decide whether to use the acoustic guidance module according to the design requirements.
- the acoustic characteristics of the two acoustic wave channels between the diaphragm and the two initial sound entrance holes from the beginning of the sound wave signal to the pickup are approximately the same (or may be different), and the mechanical structure is used to make the sound waves reach
- the phase of the two acoustic signals of the diaphragm is approximately 180 degrees out of phase. A better common mode suppression effect can be achieved on the diaphragm, and the differential mode signal is extracted to eliminate noise.
- the electret anti-noise pickup Condenser 19 sound inlet holes 4, 4a of the inner main cylinder side wall, front sound wave guide module 7, rear sound wave guide module 7a, sound wave guide module 7, 7a, front damping film 5, rear damping film 5a ,
- the inner rear cylinder 20, the inner rear cylinder fixing device 26, and its working principle, structure, materials used and circuits are all the same as the existing patents and patents of the present inventor The application is the same as the existing anti-noise pickup, so the description is omitted.
- the opening of the condenser hood 19 can be oriented toward the main sound source (or other directions).
- the opening direction of the sound wave entrance of each condenser hood 19 should be approximately the same. Of course, it can be changed to not exactly the same direction according to the design requirements.
- 19 Collect and guide the sound waves from the main sound source into the sound inlet holes 4, 4a, and at the same time weaken the sound entering from other directions. It can be greater than, equal to, and smaller than the external dimensions of the sound inlet holes 4, 4a.
- the condenser hood 19 is used to change the orientation of the sound inlet holes 4, 4a of the inner main cylinder, so that the front and rear sound wave inlets have approximately the same orientation, so that the phase of the sound waves entering the front and rear sound wave inlets is approximately the same, and the sound waves entering the pickup pass.
- the mechanical (or electronic) method is used to perform phase shifting, so that the phase of the sound waves entering from the front and rear sound wave entrances is about 180 degrees different. In this way, the mechanical (or electronic) method is used to perform common mode suppression, and the differential mode signal is extracted to resist noise.
- the various types of electret anti-noise pickups of the present invention can decide whether to use the condenser 19 outside the sound inlet hole according to the design requirements, whether to use all the sound inlet holes or part of the sound inlet holes, according to the design requirements.
- the positions of the sound inlets of the various types of pickups of the present invention and the condenser hood 19 may be symmetrical to each other or asymmetrical to each other.
- the orientations of the respective condenser hoods 19 may be the same or different.
- the front condenser hood 19 The front centerline 32 and the extension line of the rear centerline 32a of the rear condenser 19 may be on the same line segment, or on different line segments.
- the front centerline 32 and the rear centerline 32a may be on the same line segment. They may be parallel to each other, or may have a certain angle, and the front centerline 32 and the rear centerline 32a may be parallel to the center axis of the inner main cylinder, or may have a certain angle.
- the condenser hood 19 can be (1) the sound inlet holes 4, 4a opened on the side wall 1 of the inner cylinder as shown in FIG. 1 are not oriented toward the sound source, but they are still oriented Same direction. (2) As shown in FIG.
- the sound inlet hole may be partially opened on the front wall 2 of the front cover toward the direction of the main sound source, and the other part is opened on the side wall of the side wall 1 of the inner cylinder, and the direction is substantially perpendicular to the main sound source.
- the anti-noise performance is worse than using the condenser hood 19, and the opening of the condenser hood 19 can be oriented toward the main sound source, the effect is worse, but it is significantly stronger than when the sound inlet hole is opened on the front wall of the front and rear covers.
- the anti-noise effect can still achieve a relatively satisfactory effect, so the condenser hood 19 can decide whether to use it or not according to the design requirements.
- Outer rear cylinder, outer main cylinder, inner main cylinder support frame 31, inner main cylinder, inner rear cylinder 20, rear cylinder 20a, condenser 19, front and rear sound wave guide modules 7, 7a, sound inlet 4, 4a, sound tube 27, 27a, partition 9, partition 18, front gasket 8 and other internal and external shapes can be shaped, rectangular, circular, cylindrical, rectangular, triangular, diamond, Various basic shapes such as polygons, sectors, ellipses, and various arcs, such as parabola, arc, etc., as well as geometric function curves, as well as some curve segments in them, can also be various basic shapes.
- the complex shape formed by the combination of shapes can be a simple monomer of a single shape, or a complex formed by the combination of monomers of various shapes, etc. It can be a whole or a part of the whole.
- Metal can be used according to the design needs Materials can also be made of non-metallic materials or composite materials formed by combining the two with each other.
- the inner main cylinder and the inner rear cylinder 20 may be straight or curved.
- the length and width of the side wall 1 of the inner cylinder body may be between 0.2 to 50 mm, and generally between 1 to 15 mm.
- the acoustic wave guide modules 7, 7a can be integrated with the damping film pressing plates 6, 6a, or they can be separate. The same material or different materials can be used. Metal materials or non-metal materials can be used. A material formed by combining the two with each other. In order to achieve the cardioid direction directivity, the back pole cavity 16a may be filled with a damping material.
- the damping material is used to adjust the transmission speed of the sound waves, so that the sound waves entering from the front and rear sound inlet holes can reach both sides of the diaphragm 12 at the same time. This allows the two sound waves to be properly coupled to each other in order to eliminate noise. If it is a figure 8 direction directivity, the damping material (referred to as: damping material A) that reduces the sound wave transmission speed may not be filled, and the type and amount of the filled damping material A can be determined through experiments according to specific requirements.
- Non-metal materials such as non-woven fabrics can also be made of metal materials such as wire mesh or materials formed by a combination of metals and non-metals, and various synthetic materials such as various synthetic materials (referred to as: damping material B).
- damping material B The purpose is to reduce the damping membrane that is added during the use of the pickup because the gas exhaled from the mouth blows on the diaphragm 12 during breathing.
- the material and the principle of use and the sound inlet hole usually on the housing of the electret pickup.
- the front-mounted damping membrane is the same.
- the diaphragm 12 can be put into the casing in order not to damage the diaphragm 12 and affect the pickup performance.
- the damping film 5 can be made of various damping materials such as damping felt or damping non-woven fabric.
- the damping film 5 and 5a can be used according to the design requirements. For example: Put the pickup on the microphone The damping film may not be placed in the microphone in the casing. If the casing is not installed outside and the microphone of the present invention is used alone, it can be decided whether to put it in the microphone according to needs.
- the back pole base 14 can be made of an insulating material or the like.
- Impedance conversion circuit 21 can be a composite field effect tube, it can also be an integrated circuit, or it can be other Various circuits
- printed circuit board 23 wiring electrode 24, etc. are placed in the inner rear cylinder, so that it faces the direction of the sound source
- the distance between the front and back two sound inlet holes of the side wall of the inner main cylinder of U rn, can be made very close according to the needs, to achieve higher noise resistance in higher frequency bands.
- the inner rear cylinder can also be used as a part directly connected to the microphone stand, which can save the use of a microphone housing.
- a fixing device 26 is made on the outside of the inner rear cylinder 20, and a fixing device 26 that is connected to the external device can be made on any part of the inner rear cylinder 20, Various shapes such as protruding outward from the wall of the cylinder, or recessed, etc. are possible.
- the fixing device 26 shown in FIG. 1 is recessed. Inside the rear cylinder is placed the front inner support block 22 and the rear inner support block 25 of the rear cylinder.
- the back electrode holder 14 and the support block have back electrode 15a through holes 28, and back electrode 15a through the holes 28 through the inside.
- the side of the main cylinder enters the inner rear cylinder.
- the back electrode 15a penetrates the back electrode electrode through hole 28 in the back electrode holder 14 at the same level as the back electrode 15, and it can be integrated with the back electrode 15 or it can be a separate electrode.
- the electrode 15a is connected to a pin of the composite field-effect tube 21 (which may also be an integrated circuit). Circuit components such as the composite field-effect tube 21 are mounted on the printed circuit board 23. The output pins 24 and The peripheral circuit is connected.
- the lead wire "back electrode 15a" of the back pole may also be directly led through the rear wall 3 or the wall of the inner rear cylinder 20, and the back electrode lead 15a may be integrated with the back pole or may be divided. Physical.
- the circuit part can also be installed in the rear cylinder according to the design requirements, or the circuit part can be installed elsewhere outside the pickup without being installed in the inner main cylinder or the inner rear cylinder.
- the inner rear cylinder 20 may be cylindrical or other shapes, and its diameter (or cross section, the same below) may be greater than, equal to, or smaller than the diameter of the inner cylinder side wall 1, that is, the inner cylinder side wall 1 of the pickup. The diameter can be the same or different.
- the inner rear cylinder 20 can be installed in any part of the inner main cylinder according to design requirements, as long as it does not prevent sound waves from entering the forward sound hole 4 and the rear sound hole 4a, it can be oriented in any direction.
- the diaphragm 12 may be made of FEP50A (a copolymer of polytetrafluoroethylene and polyhexafluoroethylene) or a polyester film according to whether the electret is on the diaphragm 12 and the vibration performance of the diaphragm 12, whether it is a non-metallic material. 5 ⁇ ⁇ Or a metal material or a composite material formed by the combination of the two, etc. can be used for the thin film of various materials, the thickness of which can be determined according to the test, such as the thickness is equal to, greater than or less than 12. 5 microns or so. There may be a metal layer on the diaphragm 12.
- FEP50A a copolymer of polytetrafluoroethylene and polyhexafluoroethylene
- a polyester film according to whether the electret is on the diaphragm 12 and the vibration performance of the diaphragm 12, whether it is a non-metallic material. 5 ⁇ ⁇
- the inner cylinder side wall 1, the front cover front wall 2, the rear cover rear wall 3, the inner rear cylinder 20 and the condenser hood 19 can be made of metal materials such as stainless steel, copper, aluminum, etc. A metal material or a composite material formed by combining the two with each other. For other parts of this pickup, you can refer to the structure and materials used for electret anti-noise pickups using various types of first-order or multi-order air-conducting electrets with cardioid or figure-eight directivity.
- Inner cylinder side wall 1, front cover front wall 2, inner rear cylinder 20, rear cover rear wall 2 and condenser hood 19 can be separately manufactured and connected to each other as shown in the figure, or they can be made into a composite body after each other combination. Similarly, the internal components can also be manufactured separately and combined, or combined into a composite body.
- FIG. 2 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 2A to 2C are cross-sectional views respectively taken along lines AA, B-B, and C-C shown in FIG. 2.
- FIG. 2 and FIG. 1, FIG. 1A and FIG. 1C that the difference is that the back electrode 15 a bypasses the back electrode holder 14 from the outside of the back electrode holder 14, and the sound tube 27 a is connected behind the inner main cylinder.
- the impedance conversion circuit 21 and the printed circuit board 23 (the impedance conversion circuit 21 and the printed circuit board 23 can also be placed on the inner rear cylinder connected behind the inner cylinder side wall 1 FIG.
- FIG. 3 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 3A to 3C are cross-sectional views respectively taken along lines AA, BB, and CC shown in FIG. 2.
- the difference lies in that: the partition plate and the partition plate are eliminated in front of the diaphragm 12, and the sound waves entering from the condenser 19 and the forward sound hole 4 pass through the front damping.
- the membrane 5, the front damping membrane pressing sheet 6, is guided by the acoustic wave guide module 7, and the sound tube 27 on the acoustic wave guide, so that the direction of sound wave propagation is changed to approximately the direction of the diaphragm, and directly enters the front cavity 17 of the diaphragm.
- the front surface of the diaphragm 12 causes the diaphragm to vibrate.
- the circuit part is placed in the cylinder, so the rear part of the back electrode 15 must be modified accordingly.
- the back electrode 15a does not pass through the back electrode passage hole 28 on the back electrode base 14.
- the side wall of the inner main cylinder body enters the inner rear cylinder body, but directly enters the rear part of the pickup, and is connected to the impedance conversion circuit 21, and the printed circuit board 23 is also in the cylinder body 1.
- This is actually adding an existing anti-noise pickup to the sound inlet holes 4, 4a of the side wall of the inner main cylinder, the front acoustic wave guiding module 7, the rear acoustic wave guiding module 7a, the front damping film 5, and the rear damping film 5a.
- the anti-noise pickup with the front and rear sound inlets of the present invention oriented substantially the same or substantially perpendicular to each other.
- the most basic requirement of the present invention is to set the openings of the front and rear sound inlet holes 4 and 4a on the side wall of the inner main cylinder, instead of setting the rear opening on the rear wall of the rear cover like the current various anti-noise pickups. .
- FIG. 4 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 4A to 4B are cross-sectional views taken along lines A-A and B-B shown in FIG. 4, respectively.
- the difference is that the forward sound hole 4 is not opened on the side wall of the side wall 1 of the inner cylinder, but is opened on the front wall 2 of the front cover.
- the sound collecting hood 19 outside the forward sound hole 4 can be eliminated.
- the most basic requirement of the present invention is to set the opening of the back sound hole 4a on the side wall of the inner cylinder side wall 1, instead of the back sound hole 4a like the existing various anti-noise pickups.
- the opening is provided on the rear wall of the rear cover, and then the sound collecting cover 19 is added outside the rear sound hole 4a, and the opening direction of the sound collecting cover 19 and the forward sound hole opening are substantially the same.
- Fig. 5 is a sectional view showing an anti-noise pickup of the present invention.
- 5A to 5C are cross-sectional views of lines A-A, B-B, and C-C shown in FIG. 5, respectively.
- the rear cylinder 20a of the electret pickup of the present invention is a complete support cylinder, which can be used as the main cylinder in two or more single pickups (fig. In the middle is a common rear cylinder of two single pickups, the upper electret pickup 29 and the lower electret pickup 30). Therefore, the inner main cylinder and the lower electret of the rear cylinder 20a and the upper electret pickup 29 are common.
- the inner main tube system of the polar pickup 30 is made into one device.
- the rear cylinder 20a may be made of a metal such as a stainless steel material, a copper material, or an aluminum material, or a non-metal material such as plastic or a composite material.
- the shape of the rear cylindrical body 20a may be substantially the same as or different from the shape of the inner rear cylindrical body 20 of Fig. 1.
- the present invention uses a common-mode signal suppression circuit to take out the differential-mode signals received by the two pickups to eliminate noise, etc.
- the common-mode signal suppression circuit 32 can be placed in the rear cylinder 20a, or it can be placed. Elsewhere.
- each single electret pickup (such as the inner main cylinder of the upper electret pickup 29 and the inner main cylinder of the lower electret pickup 30) (the central axis formed by the extension of the central line) ) They can be on the same central axis, or on different central axes. When they are on different central axes, each central axis can be parallel to each other or at a certain angle.
- the distance between each single electret pickup of the present invention and the main sound source must be different.
- the main cylinder (such as the inner cylinder side wall 1 and the lower electret of the upper electret pickup 29) in every two electret anti-noise pickups.
- the front-rear distance between the front sound-receiving end (front cover front wall 2) and the front-wall sound inlet hole 3 of the inner cylinder side wall 1) of the body pickup 30 is determined according to design requirements, for example: can be in the range of 0.1- 200 mm or more If it is smaller than this, it can be determined according to the test, and it is usually between 1-20 mm.
- the inner main cylinder of each electret pickup can be put into the outer main cylinder to play the role of protection and support, and multiple outer electret pickups can also use one outer main cylinder together.
- the inner main cylinder of multiple electret anti-noise pickups (such as the inner main cylinder of the upper electret pickup 29 and the inner main cylinder of the lower electret pickup 30) can be supported by the inner main cylinder support 31 They can be connected and fixed to each other, or the inner main cylinder and the outer main cylinder 33 (see FIG. 11) can be connected and fixed to each other to strengthen the fixing.
- the front gasket 8 can be used in regular or irregular deformed square, rectangular, circular, rectangular, triangular, diamond shapes according to design requirements and actual needs.
- Polygonal, fan-shaped, various arc shapes such as: arcs of elliptic parabolic curved surfaces, etc., and various basic shapes, can also be complex shapes formed by the combination of various basic shapes, can be a simple single shape, or it can be Various shapes
- the various forms of the three-dimensional structure (also a hollow three-dimensional structure) formed by a single combination of various tubes, grooves, balls, plates, blocks, etc. can be a whole or a part of the whole
- the shape and installation position of this outer rear cylinder, outer main cylinder, inner main cylinder support, inner rear cylinder and outer rear cylinder cannot affect each electret pickup.
- the inner rear cylinder and the outer rear cylinder can be integrated or independent of each other. Depending on the design requirements, all can be used at the same time, or some of them can be selected. .
- acoustic characteristics of the two acoustic wave channels between the two inner main cylinders 29 and 30 that reach each other and reach the two acoustic wave channels between the diaphragms are substantially the same (or may not be completely the same), and the phase is approximately Similarly, common mode suppression can be performed by a common mode suppression circuit to extract a differential mode signal to eliminate noise.
- the outer main cylinder 25 may be provided with anti-vibration washers 36 or anti-vibration pads 37 for anti-vibration isolation.
- the individual pickups and pickup components in the present invention can also adopt various existing various types of anti-noise pickups or non-noise-resistant pickups, such as: electret pickups, moving group pickups, electromagnetic pickups, piezoelectric ceramic pickups , Semiconductor pickups, etc.
- the main cylinder of various types of anti-noise pickups in the aforementioned patents and patent applications of the inventor may be used. And the existing various anti-noise pickups are made into a new combined high anti-noise pickup.
- Fig. 6 is a sectional view showing an anti-noise pickup of the present invention.
- 6A to 6B are sectional views taken along lines A-A and B-B shown in FIG. 6, respectively.
- FIG. 6 and FIG. 5 and FIG. 5A to FIG. 5C that the difference lies in that: the rear sound hole 4a, in the inner main cylinder of the upper electret pickup 29 and the inner main cylinder of the lower electret pickup 30,
- the rear damping film pressing piece 6a, the rear acoustic wave guiding module 7a, and the rear acoustic tube 27a in the rear acoustic wave guiding module 7a are removed, and the inner main cylinder of the upper electret pickup 29 and the inner of the lower electret pickup 30 are retained.
- Forward sound hole in main cylinder 4, front resistance Nimbrane pressure sheet 6, the front acoustic wave guide module 7, and the front acoustic tube 27 in the acoustic wave guide module 7, are made of non-noise-resistant pickups in the main cylinder with an upper electret pickup 29
- the inner main cylinder and the lower electret pickup 30 are made of non-noise-resistant pickups in the main cylinder with an upper electret pickup 29
- the inner main cylinder and the lower electret pickup 30 eliminate noise through a common mode suppression circuit, and the anti-noise pickup combination is made with the front and rear sound inlets facing approximately the same or approximately perpendicular to each other. High anti-noise pickup.
- the inner main cylinder of the upper electret pickup 29 and the inner main cylinder of the lower electret pickup 30 can be made into a single inner main cylinder as required, instead of two inner main cylinders.
- Fig. 7 is a sectional view showing an anti-noise pickup of the present invention.
- 7A to 7B are a top view and a cross-sectional view taken along line A-A of FIG. 7, respectively.
- FIGS. 7 and 6 and FIGS. 6A to 6B the difference is that the inner main cylinder of the upper electret pickup 29 of the main cylinder of the non-noise-resistant pickup and the inner part of the lower electret pickup 30
- the main cylinder is placed in the front and rear sides, and the front and rear sound inlet holes 4 and 4a are on the side wall 1 of the inner cylinder (although the front wall 2 should be the front cover 2 opposite to the diaphragm 12, but because it is two
- the pickups are placed sideways from front to back, so that the front and back sides of the barrel of each of them form a front and rear wall, so their front cover 2 forms the side wall of the barrel 1), and the condenser 19 is placed in the sound inlet hole 4 Outside, the openings point in the same direction.
- an inner main cylinder support frame 31 may be placed according to design requirements.
- the inner main cylinder support frame 31 may be made of metal or non-metal material.
- the inner main cylinder support frame 31 is made of a non-metallic material, and when electromagnetic shielding is required between the inner main cylinder of the upper electret pickup 29 and the inner main cylinder of the lower electret pickup 30, a metal material may be used.
- the formed main body supports the shielding frame 31a, which can be a metal sheet or a metal sheet.
- the main cylinder support frame 31 in the metal plating layer is a metal plating layer or the like on a non-metal material. It can be made into a single main cylinder or two main cylinders.
- the non-noise-resistant pickup structure (if the pickup structure shown in FIG. 18), which is currently commonly used and puts the pickup part and the circuit part together in a main cylinder, can be made into a combined high-noise pickup with front and back Instead of using a pickup made of two parts, the main cylinder and the inner rear cylinder, as shown in the figure.
- Fig. 8 is a sectional view showing an anti-noise pickup of the present invention.
- 8A-8B are cross-sectional views taken along lines A-A and B-B shown in FIG. 9, respectively. It can be seen from Figure 8 and Figures 6 and 6A to 6B that the differences are: Because there is no inner rear cylinder, the circuit part is placed in the main cylinder, so the rear part of the back pole 15 must be modified accordingly.
- the back electrode 15a does not pass through the back electrode passage hole 28 on the back electrode holder 14 and enters the inner rear cylinder through the side of the inner main cylinder, but directly into the rear of the pickup, and is connected to the impedance conversion circuit 21 and the printed circuit board.
- the front acoustic wave guide module 7 and the front sound tube 27 are added. Multiple identical sound pickups of the existing non-noise-resistant pickups can be installed in one cylinder. And circuit part, in front of the pickup part of each electret pickup, an inner main cylinder side wall sound inlet hole 4 a front sound wave guide module 7 a front damping film 5 and a condenser cover 19 can be added to make this sound entry hole opening Combined anti-noise pickups all facing the same direction.
- Fig. 9 is a sectional view showing an anti-noise pickup of the present invention.
- 9A is a cross-sectional view taken along the line A-A shown in FIG. 9.
- the difference lies in that: the placement direction of the inner main cylinder of the upper electret pickup 29 of the main cylinder of the non-noise-proof pickup is changed to the front, and the sound is received
- the hole 4 is on the front wall 2 of the front cover facing the front, and the condenser hood 19 is placed outside the sound inlet hole 4 on the side of the inner main cylinder of the lower electret pickup 30, and the openings face the same direction.
- Upper electret pickup 29 and lower electret pickup 30 The inner main cylinder support frame 31 can be placed therebetween according to design requirements. It can be made into a single main cylinder or two main cylinders.
- the non-noise-resistant pickup structure (such as the pickup structure shown in FIG. 18) in which the pickup part and the circuit part are commonly used together in a main cylinder can be made into a combined high-noise pickup with front and rear placement. Instead of using a microphone with a main cylinder and an inner rear cylinder as shown in the figure.
- Fig. 10 is a sectional view showing an anti-noise pickup of the present invention.
- 10A is a cross-sectional view taken along the line A-A shown in FIG. 10.
- the main cylinder body of the lower electret pickup 30 which is a non-noise-resistant microphone main body is placed in the front direction instead.
- the sound hole 4 is on the front wall 2 facing the front cover, and the condenser hood 19 is placed outside the sound inlet hole 4a on the side of the inner cylinder side wall 1 of the lower electret pickup 30.
- the opening and the upper electret pickup 29 are The condenser hoods 19 face the same direction.
- An inner main cylinder support frame 31 may be placed between the upper electret pickup 29 and the lower electret pickup 30 according to design requirements.
- a rear acoustic wave guide module 7a is placed in front of the sound inlet hole 4 of the lower electret pickup 30, and there is a rear acoustic tube 27a of the rear sound wave guide module 7a from the sound inlet hole 4a to the sound inlet hole 4.
- the non-noise-resistant pickup structure (if the pickup structure shown in FIG. 18), which is commonly used and puts the pickup part and the circuit part together in a main cylinder, can also be made into a combined high-noise pickup with front and rear placement. Instead of using a pickup made of two parts, the main cylinder and the inner rear cylinder, as shown in the figure. It is also possible to switch the front and rear positions of the upper electret pickup 29 and the lower electret pickup 30 to a new embodiment.
- the inner main cylinder of the upper electret pickup 29 and the lower electret pickup 30 of FIG. 5 to FIG. 10 can also be designed as two separate main cylinder shells, or Designed as a shared inner main cylinder shell, the components in the inner main cylinder of the original upper electret pickup 29 and the lower electret pickup 30 are placed at the front and rear of the shared inner main cylinder casing, respectively.
- the inner main cylinder support frame 31 placed inside the shared inner main cylinder shell is used for isolation, on the one hand, it can isolate the sound waves, and on the other hand, it can keep the two front and rear sound receiving parts. A certain distance and the role of the connection support.
- the inner main cylinder support frame 31 may be integrated with the rear acoustic wave guide module 7a of the front pickup and the front acoustic wave guide module 7 of the rear pickup as required, or may be made as a separate body.
- the inner main cylinder support frame 31 may It can be made of materials with sound damping effect according to needs, and it can also be made of other various materials. Various suitable shapes can be adopted according to design requirements.
- FIG. 11 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 11A to 11C are cross-sectional views respectively taken along lines A-A, B-B, and C-C shown in FIG. 11. It can be seen from the comparison between FIG. 11 and FIG. 1 and FIG. 1A and FIG. 1C that the difference is that: the outer main cylinder 33 and the outer rear cylinder 34 are used, and the brackets are used in the aforementioned patents and patent applications of the inventor.
- Various types of anti-noise pickups are used.
- the inner rear cylinder 20 of the high-noise pickup and the inner rear cylinder inserted into the outer rear cylinder 34 are inserted into the insertion holes 35, and the inner main cylinder of each anti-noise pickup is placed in the outer main cylinder 33 back and forth, respectively. Outside the forward sound hole 4 and the backward sound hole 4a of the body side wall 1, sound wave guide modules 7, 7a and sound passage pipes 27, 27a in the sound wave guide modules 7, 7a are placed.
- shockproof washers 36 and shockproof pads between the outer main cylinder body 33, the inner main cylinder support frame 31, the sound wave guiding modules 7, 7a and the inner cylinder side wall 1, the front cover front wall 2, the rear cover rear wall 3 37 is used for anti-vibration isolation, and an anti-vibration gasket 36 may be used between the inner rear cylinder 20 of the electret pickup and the inner wall of the inner rear cylinder insertion hole 35 as required, or they may not be used.
- the front and rear ends of the anti-noise pickup in the outer main cylinder are forwarded
- the sound hole 4 and the rear sound hole 4a are used to place a front acoustic wave guide between the front wall of the outer front cover and the rear wall of the outer main cover and the front wall of the high-resistance voice pickup and the rear wall of the rear cover.
- the module 7 and the rear acoustic wave guiding module 7a, the inward openings of the front acoustic tube 27 and the rear acoustic tube 27a therein correspond to the front and rear sound inlet holes 4, 4a on the front wall of the front cover and the rear wall of the rear cover.
- Shock pads 37 can be used at the positions between the front wall of the front cover and the back wall of the high-noise pickup and the front and rear sound wave guide modules 7, 7a, as required, and there are sound passage holes in the shock pads.
- a sound collecting hood 19 may be provided at a portion of the front and rear sound inlet holes of the outer side wall of the outer main cylinder 33.
- Fig. 12 shows a cross-sectional view of an anti-noise pickup of the present invention
- Figs. 12A and 12B are cross-sectional views taken along lines A-A and B-B shown in Fig. 12, respectively. It can be seen from FIG. 12 and FIG. 11 and FIGS. 11A to 11D that the differences are as follows: The inner main cylinder and the inner rear cylinder 20 used in FIGS. 11 and 11A to 11D are replaced by ordinary ones placed in a single cylinder.
- the anti-noise pickup of the component is equipped with an outer main cylinder 33 on the outside, and a sound collecting hood 19 may be provided at the sound inlet hole behind the outer side wall of the outer main cylinder 33. Is the forward sound hole of the outer main cylinder 33 open? On the side wall but on the front wall of the front cover.
- a rear acoustic wave guide module 7a is provided at the rear portion of the outer main cylinder 33, and the inward opening of the rear sound passage tube 27a thereof corresponds to the rear sound inlet hole 4a on the rear wall 3 of the rear cover.
- the front damping film 5 can be placed between the forward sound hole of the outer main cylinder 33 and the forward sound hole 4 of the inner cylinder side wall 1, or it can be placed between the forward sound hole 4 of the inner cylinder side wall 1 and the diaphragm 12 You can also use it.
- FIG. 13 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 13A to 13C are cross-sectional views taken along lines AA, B-B, and CC shown in FIG. 13, respectively. It can be seen from Fig. 13 and Fig. 11, Fig. 11A to 11D and Fig. 1, Fig. 1A to 1C that the difference is that: the outer main cylinder 33 and the outer rear cylinder 34 are used, and a plurality of Various types of anti-noise pickups in the aforementioned patents and patent applications of the present inventor.
- an anti-vibration pad 36 and an anti-vibration pad 37 between the outer main cylinder 33, the sonic guide modules 7, 7a and the inner main cylinder of the upper electret pickup 29a and the inner main cylinder of the lower electret pickup 30a. It can be isolated from shock and vibration.
- An inner main cylinder support frame 31 may be placed between the two inner main cylinders.
- a condenser cover 19 may be installed at a position corresponding to the openings of the front and rear sound inlet holes 4, 4a of each anti-noise pickup in the support cylinder.
- the forward sound hole and the backward sound hole of the 33 cylinder are located between the front wall and the rear wall of each anti-noise pickup in the outer main cylinder and the front wall and the rear wall of the high-noise pickup.
- the front acoustic wave guiding module 7 and the front acoustic tube 27 in the acoustic wave guiding module 7 are placed. Place the front acoustic wave guide module 7 between the front wall of the front cover and the rear wall of the rear cover of the high-noise pickup, and use a shock-proof pad if necessary. There are sound passage holes on the shockproof pad.
- An anti-shock washer 36 may be used between the inner rear cylinder 20 of the electret pickup and the inner wall of the inner rear cylinder insertion hole 35 as needed.
- FIG. 14 shows a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 14A to 14D are cross-sectional views respectively taken along lines A-A, B-B, and C-C shown in FIG. 12. It can be seen from Fig. 14 and Fig. 11 and Fig. 11A to 11D and Fig. 13 and Fig. 13A to 13D that the difference is that the pickup used is the inner main cylinder of the upper electret pickup 29a in the main cylinder.
- Fig. 15 is a sectional view showing an anti-noise pickup of the present invention.
- 15A-15B are a top view and a cross-sectional view taken along line A-A of FIG. 15, respectively.
- the difference is that the inner main cylinder of the non-noise-resistant pickup with the upper electret pickup 29a and the lower electret pickup 30a
- the inner main cylinder is placed on the side, the sound inlet hole 4b is on the front wall 2a of the front cover on the side of the outer main cylinder 33, and the sound collecting cover 19 is placed outside the sound inlet hole 4b, and the openings face the same direction.
- the inner main cylinder support frame 31 can be placed between the inner main cylinder of the upper electret pickup 29a and the inner main cylinder of the lower electret pickup 30a, and a shockproof pad ⁇ 36 can also be placed.
- Fig. 16 is a cross-sectional view showing a noise-proof pickup of the present invention.
- 16A is a cross-sectional view taken along the line AA shown in FIG. 16. It can be seen from FIG. 16 and FIG. 15 and FIGS. 15A to 15B that the differences are as follows: The direction of placing the inner main cylinder of the upper electret pickup 29a of the main cylinder of the non-noise-resistant pickup is changed to the front direction.
- a condenser hood 19 is placed outside the sound inlet hole 4a of the side wall of the outer main cylinder 33 corresponding to the sound inlet hole 4 of the lower electret pickup 30, and the upper electret
- the openings of the pickup 29a and the lower electret pickup 30a face the same direction.
- An inner main cylinder support frame 31 may be placed between the upper electret pickup 29a and the lower electret pickup 30a according to design requirements.
- the non-noise-resistant pickup structure (if the pickup shown in FIG. 18), which commonly uses the pickup part and the circuit part together in a main cylinder, can also be made into a combined high-noise pickup with front and rear placement. Instead of a pickup made of two parts, the main cylinder and the rear cylinder, as shown in the figure.
- Fig. 17 is a sectional view showing an anti-noise pickup of the present invention.
- 17A is a cross-sectional view taken along the line A-A shown in FIG. 17.
- FIG. 17 and FIG. 15, FIGS. 15A to 15B and FIG. 16 that the differences are as follows: the placement direction of the inner main cylinder of the lower electret pickup 30 a of the main cylinder in the non-noise-resistant pickup is changed to the front placement
- the sound inlet hole 4 is located on the front wall 2 of the front cover facing the front, and the condenser cover 19 is placed outside the sound inlet hole 4a on the side wall of the corresponding outer main cylinder 33, and the electret is lowered inside the outer main cylinder 33.
- a rear acoustic wave guide module 7a is placed in front of the sound inlet hole 4 of the sound pickup 30, and a rear sound passage tube 27a of the rear sound wave guide module 7a is provided between the sound inlet hole 4a and the sound inlet hole 4.
- the openings of the condenser 19 of the upper electret pickup 29 and the lower electret pickup 30 face in the same direction.
- An inner main cylinder support frame 31 may be placed between the upper electret pickup 29a and the lower electret pickup 30a according to design requirements.
- the non-noise-resistant pickup structure (if the pickup structure shown in FIG. 18), which is commonly used and puts the pickup part and the circuit part together in an outer main cylinder, can also be made into a combination type with high anti-noise.
- a pickup not a pickup made of two parts, the main cylinder and the rear cylinder, as shown in the figure.
- the front and rear positions of the upper electret pickup 29a and the lower electret pickup 30a can be reversed to make a new embodiment.
- 18 is a cross-sectional view of an anti-noise pickup of the present invention
- FIGS. 18A and 18B are cross-sectional views taken along lines AA and BB shown in FIG. 18. It can be seen from FIG. 18 and FIG. 14, FIG.
- FIG. 11A to 11C that the difference is that the pickup used is the inner main cylinder and the lower electret pickup of the upper electret pickup 29.
- the back electrode 15a in the inner main cylinder of 30 does not pass through the back pole passage hole 28 on the back pole seat 14 and enters the inner rear cylinder through the side of the inner main cylinder. Instead, it directly enters the rear of the pickup to connect impedance conversion.
- the circuit 21 and the printed circuit board 23 are also in the cylinder 1 to form a front pickup 31a and a rear pickup 32a.
- FIG. 19 is a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 19A to 19C are cross-sectional views of lines A-A, B-B, and C-C shown in FIG. 19, respectively.
- the difference lies in that: the separator 10 is placed inside the inner edge of the stretcher ring, so that a separator gasket 9 is placed between the diaphragm 12 and the separator 10 In this way, a cavity is formed between the diaphragm 12, the spacer 10 and the spacer gasket 9 placed in the middle.
- the spacer gasket 9 can also be placed elsewhere according to the design requirements, as long as it can play the role of the diaphragm 12 and
- the function of separating a certain distance between the separators 10 causes the distance between the diaphragm 12 and the separator 10 to be determined by the thickness of the separator gasket 9.
- the inner edge of the corresponding back electrode spacer 13 may also extend inwardly to a position corresponding to the inner edge of the spacer pad 9.
- the protruding portion 7b of the acoustic wave guiding module, the protruding portion 8a of the front gasket, the protruding portion 11a of the sphincter ring, the protruding portion 14a of the back pole seat, and the protruding portion 15a of the back pole can be positioning markers to make the vibration
- the installation positions of the various components of the acoustic channel before and after the membrane can be designed to roughly correspond to the design requirements, or other types of markers that can serve as a reference can be used. You can determine which device needs a positioning marker according to your needs. .
- the position of the conductive contact between the cylinder shells is changed from the front cylinder part to the shell of the inner rear cylinder.
- the connection with the shell can be through the hard connection of the conductive sheet or the elasticity of the elastic conductor such as the conductive spring sheet 26. connection. This further makes the acoustic structure in the anti-noise pickup from the two sides of the diaphragm to the front and rear sound inlet holes approximately the same and approximately symmetrical.
- FIG. 20 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 20A to 20C are cross-sectional views of lines A-A, B-B, and C-C shown in FIG. 20, respectively. It can be seen from Figure 20 and Figures 1 and 1C to 1C that the differences are:
- FIG. 21 shows a cross-sectional view of a non-noise-resistant pickup used in the present invention
- FIGS. 21A to 21C are cross-sectional views of lines A-A, B-B, and C-C shown in FIG. 21, respectively.
- 21 and FIG. 1 and FIGS. 1A to 1C are compared with each other, and the differences are as follows: As can be seen from FIG. 21 and FIG. 20 and FIGS.
- the front and rear sound inlet holes 4 and 4a are not opened in the side wall of the inner cylinder 1 Instead, they are opened on the front wall 2 and the rear wall 3 of the front cover, so that the front and rear acoustic wave guide modules 7, 7a and the front and rear acoustic wave guide modules 7, 7a are Can't use it anymore.
- This embodiment can also be applied to the actual production improvement of various types of anti-noise pickups in the aforementioned invention patents and patent applications.
- FIG. 22 is a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 22A-22C are cross-sectional views of lines A-A, B-B, and C-C shown in FIG. 22, respectively. It can be seen from Figure 22 and Figure 21 and Figures 21A to 22C that the differences are:
- Example 21 was put into the outer main cylinder 33 and the outer rear cylinder 34.
- Various types of anti-noise pickups and various types of anti-noise pickups in the aforementioned patents and patent applications of my invention can also be put into the outer main cylinder 33 and the outer rear cylinder 34 to become the resistance of the present invention. Noise pickup.
- FIG. 23 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 23A-23C are cross-sectional views taken along lines AA, B-B, and C-C, respectively, shown in FIG. 22. From Figure 23 It can be seen from comparison with FIG. 19 and FIGS. 19A to 19C, and the difference lies in: This is mainly an actual production improvement type in each embodiment of the present invention. This embodiment can also improve the actual production of the sound pickup
- Fig. 24a shows a circuit diagram of a sound signal control switch of an anti-noise pickup of the present invention.
- a sound-activated switching circuit as shown in Figure 24a is set between the capacitor C10 and the NOT gate U4, the analog switches U6, U5.
- the structure of the sound control switch circuit is: a low distortion and low noise sound signal output from a common mode signal suppression circuit passes a capacitor C10 through a detection circuit composed of diodes D1 and D2 and a resistor R9, and a transistor T2 capacitors C15, C16, C17 resistors R14, R15 , R16 NOT gate U8, U13, Ull, U12, analog switch U10 and RJ trigger U9, which is a sound control switch circuit, which controls the control terminal 13 of the analog switch U5 to open, and the sound signal input from input 1 is output 2 Output, and after the inversion of the NOT gate U4, the control terminal 13 of the analog switch U6 is controlled to close, and the sound signal input from the input terminal 1 cannot be output from the output terminal 2.
- One of the analog switches U5 and U6 is on and the other is off. Conversely, when there is no sound signal input from the main sound source, the on and off are reversed.
- the capacitors C17 and R16 you can determine the opening and closing time of the analog switches U5 and U6 after speaking (for example, after 10 seconds) to prevent the analog switches U5 and U6 from being turned on and off by mistake due to short-term interruptions in speaking.
- the various circuits in this circuit can use integrated circuits or discrete component circuits. According to different needs, it can use analog switch circuits or digital logic switch circuits, and various types of circuits that can perform the functions of this circuit.
- FIG. 24b shows a circuit diagram of a sound signal control switch of an anti-noise pickup of the present invention.
- a sound-activated switching circuit as shown in FIG. 24b is provided between the capacitor C10 and U4, U6, U5, a sound-activated switching circuit as shown in FIG. 24b is provided.
- the principle of this circuit is the same as that of Example 24a, except that the control mode
- the sound control circuit of the pseudo switch adopts a comparator circuit.
- the comparator circuit will now be described:
- the low distortion and low noise sound signal output from the common-mode signal suppression circuit passes the capacitor C10 through a detection circuit composed of diodes D1 and D2 resistors R9, and is stabilized by resistors R17, R18, R19, R120, and R21.
- One of the analog switches U5 and U6 is turned on and the other is turned off. On the contrary, when there is no sound signal input from the main sound source, it is turned on and off.
- the setting of capacitor C18 and resistor R22 can determine the on and off time of analog switches U5 and U6 after speaking (for example, after 10 seconds), to prevent analog switches U5 and U6 from being turned on and off by mistake due to short-term interruptions in speaking.
- FIG. 24c shows a circuit diagram of a sound signal control switch of an anti-noise pickup of the present invention.
- a sound signal control switch circuit as shown in FIG. 24c may be provided between the capacitors C10, C12 and U4, U6, U5.
- the principle of this circuit is the same as that of Example 24a, except that the sound control circuit that controls the analog switch uses the sound signal received by the pickup without the reduction of ambient noise and compares it with the sound signal of low ambient noise output from the common-mode signal suppression circuit. Control the sound activated switch circuit.
- the principle of this circuit is the same as that of Example 13b, except that a hysteresis comparator is used.
- the low-distortion, low-noise sound signal output from the common-mode signal suppression circuit passes the capacitor C10 through a detection circuit composed of diodes D1, D2 and resistor R13, and the sound signal from one of the two pickups, which has not been subjected to ambient noise reduction, passes through the capacitor C12 Through a detection circuit composed of diodes D5, D6 and resistor R23, through a resistor R24, R25, R26, R22, diode D4, capacitors C15, C19, C18, hysteresis comparator U16, and R-J flip-flop U15, the control circuit is controlled by analog The control terminal 13 of the switch U5 is turned on, and the voice signal input from the input terminal 1 is turned on. No.
- Each of the signal-controlled switching circuits used in 24a-24c can use integrated circuits or discrete component circuits, and can use various types of comparator circuits and flip-flop circuits. According to different needs, it can use analog circuits, digital circuits, and required operating programs or analog-digital hybrid circuits, and various types of circuits that can complete the function of the entire circuit.
- FIG. 25 shows an over-receiving distance alarm circuit of an anti-voice pickup of the present invention.
- the signal attenuation is so large that it cannot be effectively received.
- the invention designs a warning circuit for exceeding the receiving distance.
- This circuit is actually a window comparator circuit. If the input voltage is between two specified voltages (the upper limit is the lower limit value within the design distance range, and the lower limit is the upper limit value when the distance exceeds the certain range), then the circuit There is an output (0 V in this example). If it is outside this window, the output is positive. Two comparators U17, U18 are used as window voltage comparators. If Vin is more positive than Vref (high end), U17 loses The output will be positive, while U17 is forward biased. Otherwise, the output is negative and U17 is reverse biased, so Vout is 0 V. Similarly, if Vin is more negative than Vref (low-side), U18 output will be positive, and U18 times forward biased, the output will be positive.
- Vout is 0 V. If Vin is within the window established by the reference voltage, Vout will be 0 V.
- the window comparator detects that the input voltage is between two specified voltages, it outputs a start signal to the alarm circuit U19, and outputs an alarm signal to remind the user that the distance between the anti-noise pickup and the main sound source is outside the applicable range.
- the comparator circuit in this embodiment may be a MC14574 comparator, or may use other types and types of operational amplifiers, or may use various types and types of comparators, and the comparator circuit may also use other types.
- the comparator circuit can also use other comparator circuits composed of transistors, operational amplifiers, comparators, or digital circuits. You can use integrated circuits or discrete component circuits. You can use various types of comparator circuits and Trigger circuit. According to different needs, it can use analog circuits, digital circuits, and required running programs or analog-digital hybrid circuits, and various types of circuits that can complete the function of the entire circuit.
- Fig. 26 shows a cross-sectional view of the anti-noise pickup of the present invention
- Figs. 26A-26C are cross-sectional views of lines A-A, B-B, and C-C shown in Fig. 26, respectively.
- FIG. 26 and FIG. 20, FIG. 20A to 20C and FIG. 14, and FIG. 14A to FIG. 14C that the difference is that the non-noise-resistant pickup used is the spacer gasket 10 in the noise-free pickup shown in FIG. 20.
- Front gasket 8, baffle 9, rear sound inlet hole 4a, rear sound wave guide module 7a, and rear sound tube 27a are taken out, which is actually the sound input on the front wall of the front cover of a normal non-noise pickup
- the hole is instead opened on the side wall of the main cylinder.
- the sound inlet hole 4 can also be partly on the side wall of the main cylinder and part on the front wall of the front cover.
- Front wall of front cover of inner main cylinder of polar pickup 29a and inner electret of lower electret pickup 30a There is no need to leave the sound inlet hole 4b and the corresponding sound inlet channel between the sound inlet holes 4 on the top 2.
- a plurality of electret non-noise-resistant pickup main barrels can be made by the main barrel support 31.
- the main body of the upper electret pickup 29 and the main body of the lower electret pickup 30 are connected and fixed to each other.
- This figure shows an anti-noise pickup constituted by two non-noise-resistant pickups 29, 30 of this type.
- One or more non-noise-resistant pickups of this type can be used.
- FIG. 27 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 22A-22C are cross-sectional views taken along lines A-A, B-B, and C-C shown in FIG. 22, respectively.
- the non-noise-resistant pickup used is the sound wave guide module 7, the sound tube 27 in the non-noise-resistant pickup shown in Fig. 26.
- This figure shows three anti-noise pickups of this type made of three non-noise-resistant pickups 29, 30, 30a.
- One or more non-noise-proof pickups of this type can be used. It is not necessary to use the conductive sheet 26 when the tension ring is directly in contact with the front cylinder shell.
- Fig. 28 shows a cross-sectional view of the anti-noise pickup of the present invention
- Figs. 28A to 28C are cross-sectional views of lines A-A, B-B, and C-C shown in Fig. 28, respectively.
- the difference is that the anti-noise pickups formed by the rear cylinders 20 of the multiple non-noise-resistant pickups are respectively inserted into the outer rear cylinders 34.
- Fig. 28 shows a cross-sectional view of the anti-noise pickup of the present invention
- Figs. 28A-28C are cross-sectional views taken along lines A-A, B-B, and C-C shown in Fig. 28, respectively.
- FIG. 29 shows a cross-sectional view of the anti-noise pickup of the present invention
- FIGS. 29A-29B are cross-sectional views taken along lines A-A and B-B shown in FIG. 29, respectively. It can be seen from FIG. 29 and FIG. 26 and FIG. 26A and FIG. 26C that the differences are as follows: And the front cover 2 of the front cover 2 of the plurality of non-noise-resistant pickups 29, 30, and 30a is placed in the same direction. One or more non-noise-resistant pickups of this type can be used.
- Fig. 30 shows a cross-sectional view of an anti-noise pickup of the present invention
- Figs. 30A-30B It is a sectional view taken along line AA and line BB shown in FIG. 30, respectively. It can be seen from FIG. 30 and FIG. 29 and FIGS. 29A to 29B that the differences are as follows: The sound wave guiding module 7 and the sound tube 27 in the multiple non-noise-resistant pickups in this figure are taken out. In addition, the front wall 2 of the front cover of the pickups in the plurality of non-noise-resistant pickups 29 and 30 is placed facing away. One or more non-noise-resistant pickups of this type can be used.
- various types of anti-noise pickups and non-noise-proof pickups in the various embodiments of the present invention may be used alone, or a plurality of them may be connected and fixed to each other at a certain interval or a certain spatial structure to form a two-dimensional or three-dimensional three-dimensional structure.
- FIG. 31 shows a block diagram of an over-receiving distance alarm circuit of an anti-noise pickup of the present invention.
- the present invention designed a warning circuit for exceeding the receiving distance.
- non-noise-resistant pickups are used for ranging alarming.
- the non-noise-resistant pickups 311, 312, and 313 receive external environmental noise.
- the non-noise-resistant pickups 312 are divided into two paths after amplitude compensation 314, respectively.
- Anti-noise pickups 311, 313 electric signals after amplitude compensation 313, 315 pass common mode suppression Circuits 316 and 317 remove common mode signals (this actually forms two anti-noise pickups), and the two extracted differential mode signals (sound electrical signals from the main sound source at close range) are compared with each other through a window comparator circuit 318 One is used as the reference benchmark, and the other is compared with the reference benchmark.
- the circuit When the ratio between the two is between a certain ratio (the lower limit of the upper limit is within the design distance range, the lower limit is the upper limit of the distance beyond the certain range of the design distance. Limit value), the circuit will output to the alarm circuit 319, and alarm through the alarm 3110.
- This embodiment uses three non-noise-resistant pickups 311, 312, and 313. More non-noise-resistant pickups may be used, or non-noise-resistant pickups and anti-noise pickups may be used in combination.
- FIG. 32 shows a block diagram of an over-receiving distance alarm circuit of an anti-noise pickup of the present invention.
- the anti-noise pickups 321 and 32 Receive the acoustic electric signals from the main sound source at a short distance, and perform electrical compensation after amplitude compensation 323 and 324, respectively, and compare each other through the window comparator circuit 325. One way serves as a reference, and the other way and the reference The benchmark is compared.
- the circuit When the ratio between the two is within a certain ratio (the upper limit is the lower limit value within the design distance range, and the lower limit is the upper limit value beyond the certain range of the design distance), the circuit will output to the alarm circuit. 326, alarm through the alarm 327.
- two anti-noise pickups 321 and 322 are used, and more anti-noise pickups may also be used, or non-noise-resistant pickups and anti-noise pickups may be used in combination.
- Figure 33a and Figure 33b are block diagrams of a digital data acquisition common mode suppression system circuit
- FIG. 34 shows a computer flow chart of an anti-noise pickup over-receiving distance alarm and adjusting an amplifier's amplification factor based on the receiving distance in a pickup of the present invention.
- the sound signals received by the multiple anti-noise pickups 1, 2 ... are subjected to A / D conversion by using multiple anti-noise pickups
- the sound signals received by the two anti-noise pickups 1, 2, ... are extracted by a filter circuit.
- the same acoustic wave electrical signal calculate the distance and / or orientation between the main sound source and the pickup by calculating parameters such as the power magnitude and / or time difference of two identical sound wave signals and / or looking up the table, and beforehand Set the effective receiving distance of the pickup for comparison. Is the distance between the main sound source and the microphone between the upper and lower limits of the predetermined distance? When it is between the upper and lower limits of the predetermined distance, calculate the amplification factor that the amplifier should be at this distance.
- Fig. 35 shows a computer flow chart of a non-noise-resistant pickup used in the pickup of the present invention for an over-receiving distance alarm and adjusting an amplifier's amplification factor based on the receiving distance.
- the sound signals received by the multiple non-noise-resistant pickups 1, 2, and 3 are subjected to A / D conversion to calculate the differential mode between the two microphones.
- a / D conversion to calculate the differential mode between the two microphones.
- you can directly connect the two sonic signals Make a rough calculation of the approximate distance between the main sound source and the time source.
- the same acoustic electric signal in the sound signal picked up by the microphone is calculated by calculating one or more parameters such as the power of two identical sound wave signals picked up by the microphone and / or the time difference between the two sound pickup signals and / or Calculate a more accurate distance and / or orientation between the main sound source and the pickup by using a table lookup method, and compare it with the preset effective receiving distance of the pickup. Is the distance between the main sound source and the microphone within the predetermined upper and lower limits?
- Fig. 36 shows an over-receiving distance alarm circuit of an anti-noise pickup used in the pickup of the present invention.
- This circuit is actually a window comparator circuit with a gating function.
- the sound and electrical signals of the main sound source received by the two anti-noise pickups can be pre-processed by various pre-processing circuits such as filtering and time delay according to the design requirements. It is also possible not to use a pre-processing circuit.
- the main electrical sound signal Va and Vb received by two anti-noise pickups assuming that the main electrical sound signal received by the anti-noise pickup close to the main sound source is Va, and the main sound source electrical signal received by the anti-noise pickup far from the sound source For Vb, You can set Va or Vb as the reference standard. Here, suppose Vb is used as the reference standard.
- Fig. 37 shows a digital noise cancellation positioning receiving computer flow used in the pickup of the present invention.
- the following describes the process of positioning and receiving an anti-noise pickup or non-noise pickup using a plurality of two-dimensional structures arranged side by side or a three-dimensional structure with a certain three-dimensional structure or a three-dimensional array structure with a certain spatial array configuration in the present invention:
- the differential electrical signals can be extracted by digital common mode suppression between the acoustic and electrical signals received by the two pickups, or the next step can be directly processed without common mode suppression.
- Fig. 38 shows a window comparator circuit with a plurality of intervals, which adjusts the amplification factor of the amplifier according to the reception distance, of an anti-noise pickup used in the pickup of the present invention.
- Fig. 36 uses a single interval comparator
- Fig. 38 uses a window comparator with multiple intervals, so that the amplifier can be based on the distance between the pickup and the sound source. Different amplification factors are used.
- This circuit is actually a window comparator circuit with a gating function with multiple intervals.
- the two electrical signals Va, Vb from the main sound source received by the anti-noise pickup are assumed to be received by the anti-noise pickup close to the sound source.
- the electrical sound signal from the main sound source is Va.
- Set the electrical sound signal from the main sound source that is received by the anti-noise pickup far from the sound source is Vb.
- Vb The ratio of Vb to the reference reference is between the specified ratios M and N (the ratio of the upper limit of M when the distance exceeds a certain range of the design distance and the lower limit of N within the design distance), and the Vb signal is amplified by Circuits 36A1 and 36A2, which are amplified by M and N times (the values of M and N can be positive or negative The value can be an integer or a non-integer with a decimal. )
- the Vb signal passes through the amplifying circuits 36A1 and 36A2, and the voltage interval after being amplified by M and N times is assumed to be Vbl, and the window comparator circuit with the gating function in multiple intervals is four intervals, assuming 37R3 to 37R4.
- Voa, Vob, Voc, and Vod high-level outputs can respectively start the switches of different amplification factors of the analog amplifier, and can also start multiple alarm circuits, or both the switches of different amplification factors of the amplifier and Activate one or more alarm circuits.
- the window comparator circuit with gating function in multiple sections can design the number of gating sections and the window voltage value of the sections according to the design requirements.
- the comparator circuit may use the MC14574 comparator, or other various types and types of comparators and comparator circuits, and the AND circuit may use CD4081, and the comparator circuit And AND circuits can also use other types of comparator circuits, AND circuits, NAND circuits, etc., or other comparator circuits composed of transistors, operational amplifiers, comparators or digital circuits, and Gate circuits or NAND circuits, etc., can use integrated circuits or discrete component circuits. Various types of 'comparator circuits, AND circuits or NAND circuits, and flip-flop circuits can be used. According to different needs, various types of analog circuits, digital circuits, or analog-digital hybrid circuits can be used, and various types of circuits that can perform the functions of this circuit.
- Fig. 39 shows an amplifier circuit of an anti-noise pickup used in the pickup of the present invention to adjust the amplification factor of the amplifier according to the reception distance.
- FIG. 40 shows a cross-sectional view of an anti-noise pickup of the present invention
- the difference is that it is a combination of a plurality of non-noise-resistant pickups 40a1 and 40a2 and anti-noise pickups 40a3 and 40a4.
- one or more non-noise-resistant pickups can be used and one or more anti-noise pickups can be combined.
- Figure 41 shows the flow of a digital noise canceling computer used in the pickup of the present invention.
- the processing flow of anti-noise receiving by using a plurality of two-dimensional structure anti-noise pickups or non-noise-proof pickups arranged in the present invention is as follows:
- the delay time is that the sound wave signals are respectively from the close to the main sound source The time it takes for each pickup to reach the pickup farthest from the main sound source.
- the actual distance and / or orientation of the main sound source and the pickup that emits this sound wave can be known, and the actual distance and / or orientation of the main sound source and the pickup can also be obtained by using various other calculation processing methods.
- the sound wave signal from the main sound source at a certain distance from the pickup can be extracted.
- the obtained differential mode signal and / or the sound wave signal from the main sound source at a certain distance are stored, and / or output through I / O, and / or other further processing is performed.
- a common mode calculation is performed between one of the sound wave signals picked up in the pickups 1, 2, 3, ... and the differential mode signal obtained again after amplification, to obtain the differential mode signal between them, which is removed.
- Ambient noise of sound waves from the main source The environmental noise storage from which the sound wave from the main sound source is removed, and / or the I / O output, and / or further processing is performed.
- Fig. 42 is a block diagram showing a noise canceling circuit used in the pickup of the present invention.
- the processing block diagram of the present invention using a plurality of two-dimensional structured anti-noise pickups or non-noise-resistant pickups for anti-noise reception is: You can use 1. 2. Or the sound wave signals of the pickups 42al, 42a2, 42a3 except for the sound wave signal picked up by the pickup farthest from the main sound source are passed through the time delay circuit 42a4, 42a5, 42a6, and the delay time is the sound wave signal. The time it takes for each pickup close to the main sound source to reach the pickup farthest from the main sound source, and the sound wave signals picked up by each pickup pass through the common mode suppression circuits 42a7 and 42a8 in pairs, so that the differential sound signal from the main sound source Sound waves can be reduced to a minimum degree of distortion.
- the multi-mode differential signal is obtained by calculating the common-mode rejection between the sound wave signals picked up by each pickup in the previous step 2.
- the two or more differential-mode signals are passed through the common-mode suppression circuit 42al again. l, get the differential mode signal again. (The delay time is: the time it takes for a sound signal to travel from one pickup to another pickup.
- All time delays are used to eliminate the two signals from the time difference caused by the sound wave transmission speed when the sound waves emitted by the main sound source reach the front and rear pickups.
- the distortion of the sound wave from the main sound source in the differential mode signal caused by common mode signal suppression.).
- a common mode suppression circuit 42al3 is obtained between one of the sound wave signals picked up in the pickups 42al, 42a2, and 42a3 and the differential mode signal obtained again through the amplification circuit 42al2 to obtain a differential mode signal between them, which is removed.
- This noise cancellation block diagram flow can be implemented using digital circuits, or it can be implemented using analog circuits or mixed circuits containing analog circuits and digital circuits.
- the delay circuit can adopt analog delay circuit, CCD delay circuit, digital delay circuit ...
- FIG. 43 shows a cross-sectional view of an anti-noise pickup used in the present invention
- FIG. 43A is a cross-sectional view taken along the line A-A shown in FIG. 43. From Fig. 43 and Fig. 1, Fig. 1A to 1C, Fig. 21, and Figs.
- the difference is that the front and rear sound inlet holes 4, 4a are not opened on the side wall of the outer wall 1 of the inner cylinder, but they are Opened on the side wall 2 of the front cover of the main cylinder body 3 on the side wall of the main cover of the main cylinder body (the relative position between the main sound source and the pickup in the previous embodiments is a back-and-forth relationship, so it is named: the inner cylinder side wall 1, front cover front wall 2, rear cover rear wall 3, although the absolute position of each component has not changed in embodiments 43, 44, 45, but because the relative position between the main sound source and the pickup as shown in the figure changes Therefore, in embodiments 43, 44, 45, he was renamed the outer wall of the cylinder 1, the front cover side wall 2, the rear cover side wall 3), so that the front and rear acoustic wave guide modules 7, 7a and the front and rear acoustic wave guide modules 7,
- Figures 1, 1A, 1C, and 21A-21C are the same as the existing anti-noise pickups.
- the main sound source is located in front of the front wall of the front cover of the pickup or behind the rear wall of the rear cover
- the relative positions of the front and rear sound inlet holes and the main sound source are arranged one behind the other and one behind the other.
- the position of the main sound source 40 is on the side of the pickup, that is, on the outer circumference of the front main cylinder section AA
- the relative positions of the front and rear sound holes and the main sound source are arranged side by side, and the distances to the main sound source are approximately the same.
- the surface 39 of the outer wall 1 corresponding to the main sound source 38 becomes the actual front wall
- the sound inlet hole 4 on the side wall of the front cover of the main cylinder is The direction of the sound inlet holes 4 on the side wall of the main cylinder with respect to the surface 39 corresponding to the main sound source 38 on the side of the main cylinder is arranged one after the other, such as the forward sound in the figure
- the hole 4 is on one side (front) of the side wall 2 of the front cover of the main cylinder
- the rear sound inlet hole 4a is on the other side (rear) of the side wall 3 of the main cover of the main cylinder, and vice versa, relative to the main sound source.
- the front and rear sound inlet holes are respectively on the side wall of the front cover of the main cylinder of the anti-noise pickup and the side wall of the main cover of the main cylinder, and the direction of the main sound source on the side of the main cylinder is on the front side of the main cylinder.
- One side of the wall and the other side of the side wall of the back cover of the main cylinder are arranged in front and back, and may be one or a plurality of sound inlet holes.
- the main sound source 38 in FIG. 43A is provided on the outside of the outer wall 1 of the cylinder opposite to the rear cylinder 20, instead of being provided on the outside of the outer wall 1 of the cylinder parallel to the side of the rear cylinder 20 in FIG. 43. .
- This is to show that when the relative positions of the main sound source 38 and the outer surface of the outer wall 1 of the cylinder are different, the relative positions of the front and rear sound inlet openings on the side wall of the front cover of the main cylinder and the side wall of the main cover are also different.
- the specific position of the main sound source on the outer circumference of the pickup can be determined according to the design requirements.
- the front and rear sound inlet holes 4, 4a are determined relative to the specific position of the main sound source on the side wall of the front cover of the main cylinder 1, and the rear cover of the main cylinder.
- the direction and position of the side-by-side arrangement of the side wall 3 and the distance between the side-by-side arrangement relative to the main sound source are different.
- the sound collecting hood 19 may be installed outside the front and rear sound inlet holes, or it may not be installed.
- New types of anti-noise pickups for front and rear sound inlets can be made by using various types of anti-noise pickups and other various types of anti-noise pickups in various patents and patent applications of the present inventor.
- FIG. 44 shows a cross-sectional view of an anti-noise pickup used in the present invention
- FIG. 44A is a cross-sectional view taken along the line AA in FIG. 44. It can be seen from Fig. 44 and Fig. 1, Figs. 1A to 1C, Fig. 43, and Fig. 431A that the difference is that when the main sound source is on the side of the main cylinder, the sound inlet holes 4, 4a are not opened on the side of the outer wall 1 of the inner cylinder.
- two non-noise-resistant pickups 29, 30 placed in parallel with each other are opposite to the forward sound hole 4 and the side wall of the main cylinder body cover.
- the rearward sound holes 4a on 2a are arranged one behind the other in the direction of the main sound source on the side of the main cylinder.
- the forward sound holes 4 in the figure are on the side of the front cover side wall 2 of a pickup.
- the rear sound inlet hole 4a is on the other side (rear) of the side wall 2a of the front cover of the other main cylinder of the pickup, and vice versa, there is a certain back and forth between the two with respect to the main sound source The distance is poor. That is, the front and rear sound inlet holes are on different planes of the side walls of the main cylinder cover of the two anti-noise pickups 29 and 30, respectively.
- the direction of the main sound source on the side of the main cylinder is on the main cylinder front cover.
- One side of the side wall and the other side of the side wall of the front cover of the other main cylinder of the microphone are arranged back and forth, and may be one or multiple sound inlet holes.
- Two of the latter can be placed in parallel or side by side at a certain angle, can be placed side by side, or there can be a certain front-to-back distance, which can make the two pickups closely contact each other, or make the two There is a certain distance between them (the filling material can be filled in between).
- Fig. 45 shows a cross-sectional view of an anti-noise pickup used in the present invention. From Fig. 45 and Fig. 1, Fig. 1A to 1C, Fig. 43, Fig. 431A, Fig. 44, and Fig. 44A, the difference is that when the main sound source is on the side of the main cylinder, the sound inlet holes 4 and 4a are not opened. On the side walls of the outer wall 1 of the cylinder, they are opened on the side walls of the main cylinder cover 2 and the side walls 2a of the main cylinder cover of the two non-noise-resistant pickups 29 and 30 which are placed alternately with each other.
- the forward sound hole 4 on the side wall 2 of the front cover of the main cylinder and the rear sound hole 4a on the side wall 2a of the front cover of the non-noise pickup are in the center of the side walls of the front cover of the two main cylinders. Or, in the opening position of the normal sound inlet of a more common pickup, the positions of the sound inlets of the two pickups are approximately the same. This is achieved by placing two non-noise-resistant pickups in parallel with each other and staggered to each other so as to face the main sound source 38. of The front and rear sound inlet holes 4 and 4a in the direction of the front end 39 of the side wall of the main cylinder are arranged one after the other.
- FIG. 43, FIG. 44, and FIG. 45 can be modified to make a new forward and backward sound by using various types of anti-noise pickups and other various types of anti-noise pickups in various patents and patent applications of the present inventor.
- High mouth anti-noise pickup The front and rear inlets are oriented towards the same or almost vertical high noise pickup.
- the front and rear sound inlet holes are provided at the front and rear ends of the main cylinder body front cover side wall and the main cylinder body rear cover side wall of the anti-noise pickup, which are not on one plane, However, in terms of the end face 39 of the anti-noise pickup, which is directly opposite the main sound source, it is still located on the side wall of the outer wall of the anti-noise pickup. (In fact, the end face 39 of the pickup directly facing the main sound source is the main The side wall of the front cover of the cylinder, and the side wall 2 of the front cover of the main cylinder and the side wall 2a of the back cover of the main cylinder are actually the outer wall of the main cylinder).
- All the components in the present invention such as: outer rear cylinder, outer main cylinder, inner main cylinder, inner main cylinder support frame 31, inner cylinder side wall 1, cylinder 20, rear cylinder 20a,
- the internal and external shapes of each component such as the condenser hood 19, the front and rear sound wave guide modules 7, 7a, the sound inlet holes 4, 4a, the sound pipes 27, 27a, the partition 9, the partition hole 18, the front gasket 8, and so on
- Various regular or irregular deformed squares, rectangles, circles, cylinders, rectangles, triangles, rhombuses, polygons, sectors, ovals can be used according to design requirements and actual needs.
- Various arcs such as: parabolic, Various shapes such as arcs and geometric function curves, as well as some basic curve segments and other basic shapes, can also be complex shapes formed by the combination of various basic shapes, which can be simple single shapes, or It is a composite body formed by a single combination of various shapes. It can be a whole or a part of the whole. Depending on the design, you can use metal materials or non-metal materials. So the two are combined The formed composite material is made. However, the shape and installation position of this outer rear cylinder, outer main cylinder, inner main cylinder, inner main cylinder support, inner rear cylinder, and outer rear cylinder cannot affect each electret pickup.
- the inner main cylinder, the outer main cylinder, the inner main cylinder, the inner main cylinder supporting frame, and the inner rear cylinder, the outer rear cylinder, etc. may be integrated into one body, or may be independent of each other. Design requirements can be used all at the same time, or some of them can be selected.
- the inner main cylinder support 31 will be able to combine multiple inner main cylinders of the electret anti-noise pickup (such as the inner main cylinder of the upper electret pickup 29 and the inner main cylinder of the lower electret pickup 30), and
- the outer main cylinders 25 are connected and fixed to each other to strengthen the fixing.
- the central axis (center) of the inner main body of each single electret pickup in the combined anti-noise pickup (such as the inner main cylinder of the upper electret pickup 29 and the inner main cylinder of the lower electret pickup 30)
- the central axis formed by the extension of the line can be on the same central axis, or on different central axes. When on different central axes, each central axis can be parallel to each other or there can be some angle.
- the front and rear sound inlet holes used by the various pickups and the condenser hood 19 placed outside the sound inlet holes may be on the same line segment, or on different line segments, and when on different line segments.
- the two may be parallel to each other, may have a certain angle, may be parallel to each other, and may have a certain angle with the central axis of the inner cylinder side wall 1. It can be on one line segment parallel to the central axis of the pickup, or on different line segments. When on different line segments, the line segments can be parallel to each other or at a certain angle.
- the openings of the sound entry holes from the front and rear are oriented in approximately the same direction (or they may not be completely the same, such as a difference of about 0 ° -135 degrees), which can be achieved by using Use a polyphonic hood to make the initial sound inlet hole in the direction of the main sound source, so that the phase of the incoming sound wave signal is approximately the same (also can be approximately 0 ° -135 degrees apart).
- the acoustic characteristics of the two acoustic wave channels between the two corresponding initial sound inlet holes on each main cylinder in the cylinder and between the two diaphragms are approximately the same (or they may not be completely the same), and through the action of the mechanical structure
- the phase between the two acoustic signals is approximately 180 degrees (also approximately 0 ° -135 °), and the common mode suppression effect can be achieved on the diaphragm, and the differential mode signal is extracted to eliminate noise.
- the common mode suppression can be performed by the common mode suppression circuit, and the principle of eliminating the noise of the differential mode signal is extracted.
- Electromagnetic conversion pickups include: a. In electro-dynamic pickups: dynamic coils Type pickups, flat pickups, moving coil pickups, etc., b. Electromagnetic pickups, etc. c. Magnetostrictive pickups, etc. 2. Included in electrostatic conversion pickups: a.
- Electrostrictive pickups piezoelectric two-chip pickups, etc. 3.
- Impedance transformation pickups Resistive wire strain pickups, semiconductor strain pickups, etc. 4.
- Photoelectric conversion pickups a. Phase change pickups: Interference pickups, DAD pickups, etc. b.
- the spacer gasket 10, the front spacer 8, the spacer 9, the sling ring 11, the diaphragm 12, and the back pole 15 in the inner main cylinder can be composed.
- the pickup part is replaced with other various pickup components, such as electret pickups, condenser pickups, dynamic pickups, electromagnetic pickups, piezoelectric ceramic pickups, semiconductor pickups, etc., or the entire pickups can be replaced. .
- Various single non-noise-resistant pickups of the existing and new inventions also used in the present invention can be replaced with electret pickups, condenser pickups, Various types of pickup pickup components, such as dynamic pickups, electromagnetic pickups, piezoelectric ceramic pickups, semiconductor pickups, etc., can be replaced with their entire pickups.
- the noise elimination method adopted in the present invention makes the noise cancellation better, the useful signal generated by the main sound source is lower than the signal of a general pickup, so an amplification circuit needs to be added, and various current amplification circuits commonly used can be adopted.
- This amplifier circuit can be placed inside or outside the pickup.
- a plurality of anti-noise pickups and / or non-noise-resistant pickups of the present invention may be arranged in a two-dimensional structure or a three-dimensional structure with a certain three-dimensional structure or a three-dimensional array structure with a certain spatial array configuration.
- a plurality of anti-noise pickups and / or non-noise-proof pickups are used to perform a two-dimensional arrangement in front and back, they are arranged up and down in the drawings of the description, and in actual use, the distance between the front and back of the main sound source.
- the inner main cylinder and the inner rear cylinder which are combined with each other may be used in the present invention, or only the inner main cylinder is used, and the outer main cylinder and the outer rear cylinder which are combined with each other may also be used. Only the outer main cylinder body may be used, and there may be the front wall of the front cover and the rear wall of the rear cover of the housing of the inner main cylinder and the outer main body, or there may be no front wall of the front cover and rear wall of the rear cover. , Or just one of them. When using only one pickup part and pickup in the inner main cylinder and outer main cylinder, you should use Anti-noise pickup parts and use of anti-noise pickups.
- both anti-noise pickup parts and anti-noise pickups can be used, as well as non-noise-resistant pickup parts and non-noise-resistant pickups.
- These pickup parts and pickups can be placed together in the same main body
- the cylinder body and the same outer main cylinder body may also be separately placed in a plurality of inner main cylinder bodies and a plurality of outer main cylinder bodies.
- an inner rear cylinder and an outer rear cylinder may be connected to one or a plurality of inner main cylinders or outer main cylinders.
- each of them can be arranged and combined in various positions and directions, such as: each pickup can be serially connected in front or back, or all can be placed side by side, or It can be partly facing forward or backward, another part facing the side, or different directions within 360 degrees, etc., and various permutations and combinations.
- the sound receiving end can also be facing the same direction, or it can be facing the opposite direction. It can also be oriented in opposite directions, partly in the forward or backward direction, another part in the direction of the side, or all in the direction of the side, or in different directions within 360 degrees.
- the positions and orientations of the sound pipes, etc. can also be changed accordingly. You can decide whether to use all or part of them according to the design requirements.
- the inner rear cylinder and the outer rear cylinder can be installed at any position on the inner main cylinder and the outer main cylinder except for a position that prevents sound waves from entering the front and rear sound inlets, and can face in any direction.
- the inner main cylinder and the outer main cylinder When the pickup is divided into a front cylinder and a rear cylinder as shown in FIG. 1 and other embodiments, the front cylinder is the main cylinder.
- the circuit part When it is set in the main cylinder, the main cylinder contains two parts: a pickup part and a circuit part.
- the main cylinder includes three parts: the front wall of the main cylinder facing the main sound source, the rear wall of the main cylinder facing away from the main sound source, and the side wall of the main cylinder facing the main sound source.
- the side wall of the main cylinder is the side wall 1 of the cylinder
- the front wall of the main cylinder is the front wall of the front cover
- the rear wall of the main cylinder is the rear wall of the rear cover.
- the side wall of the main cylinder is the side wall of the front cover of the main cylinder and / or the side wall of the back cover of the main cylinder
- the front wall of the main cylinder is the main cylinder facing the main sound source.
- the part of the side wall of the body, the rear wall of the main cylinder is the part of the side wall of the main cylinder facing away from the main sound source, so the front wall of the front cover should actually be named the front cover side wall, and the rear wall of the rear cover should actually be Name the side wall of the back cover, and the side wall of the cylinder should be named the outer wall of the cylinder.
- the present invention is designed based on an embodiment in which an electret pickup is made of an electret high anti-noise pickup, but it can also be used in various types of pickups to make corresponding types of anti-noise pickups.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/203,107 US7194095B2 (en) | 2000-02-03 | 2001-02-02 | Anti-noise pick-up |
JP2001562057A JP2003524355A (en) | 2000-02-03 | 2001-02-02 | Noise suppression voice pickup |
EP01905594A EP1261233A1 (en) | 2000-02-03 | 2001-02-02 | An anti-noise pick-up |
AU3358001A AU3358001A (en) | 2000-02-03 | 2001-02-02 | An anti-noise pick-up |
AU2001233580A AU2001233580B9 (en) | 2000-02-03 | 2001-02-02 | An anti-noise pick-up |
CA002399204A CA2399204A1 (en) | 2000-02-03 | 2001-02-02 | An anti-noise pick-up |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN00100775 | 2000-02-03 | ||
CN00100775.0 | 2000-02-03 | ||
PCT/CN2000/000358 WO2001058210A1 (en) | 2000-02-03 | 2000-10-24 | Anti-noise pickup |
CNPCT/CN00/00358 | 2000-10-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001063969A1 true WO2001063969A1 (en) | 2001-08-30 |
Family
ID=25739119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2001/000108 WO2001063969A1 (en) | 2000-02-03 | 2001-02-02 | An anti-noise pick-up |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1261233A1 (en) |
JP (1) | JP2003524355A (en) |
AU (1) | AU3358001A (en) |
CA (1) | CA2399204A1 (en) |
WO (1) | WO2001063969A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN85101800A (en) * | 1985-04-01 | 1987-02-04 | 北方电信有限公司 | The telephone bandset microphone assembly |
CN1070532A (en) * | 1991-09-09 | 1993-03-31 | 星电株式会社 | Electret capacitor microphone |
CN2273937Y (en) * | 1996-08-05 | 1998-02-04 | 胡建国 | Capacity type electret microphone |
-
2001
- 2001-02-02 EP EP01905594A patent/EP1261233A1/en not_active Withdrawn
- 2001-02-02 WO PCT/CN2001/000108 patent/WO2001063969A1/en active IP Right Grant
- 2001-02-02 JP JP2001562057A patent/JP2003524355A/en not_active Withdrawn
- 2001-02-02 AU AU3358001A patent/AU3358001A/en active Pending
- 2001-02-02 CA CA002399204A patent/CA2399204A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN85101800A (en) * | 1985-04-01 | 1987-02-04 | 北方电信有限公司 | The telephone bandset microphone assembly |
CN1070532A (en) * | 1991-09-09 | 1993-03-31 | 星电株式会社 | Electret capacitor microphone |
CN2273937Y (en) * | 1996-08-05 | 1998-02-04 | 胡建国 | Capacity type electret microphone |
Also Published As
Publication number | Publication date |
---|---|
CA2399204A1 (en) | 2001-08-30 |
AU3358001A (en) | 2001-09-03 |
EP1261233A1 (en) | 2002-11-27 |
AU2001233580B2 (en) | 2005-08-11 |
JP2003524355A (en) | 2003-08-12 |
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