JP4874029B2 - Acoustic device and communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an acoustic device and a speaking device capable of preventing the occurrence of echo. <P>SOLUTION: Permanent magnets 2, 3 with N and S poles magnetized alternatively in a striped manner are disposed on a front surface side of a diaphragm 1 and on a rear surface side of the diaphragm 1 respectively, and a conductor circuit 4 is wired on the diaphragm 1 along the striped magnetic poles in the permanent magnets 2, 3. A microphone 9 is disposed at a location where a distance from the surface of a baffle 8 on a front surface side of the same and a distance from the surface of the baffle 8 on a back surface side of the same are coincident with each other, and an opening part 9a of the microphone 9 from which a sound is input is formed like a straight line at a location where the distance from the surface of the baffle 8 on the front surface side of the same and the distance from the surface of the baffle 8 on the back surface side of the same are coincident with each other. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention has, for example, a hands-free function of playing back a voice according to a voice signal received by an information communication terminal such as a mobile phone, and taking in the voice of the speaker and outputting the voice signal to the information communication terminal. The present invention relates to a communication device and an audio device applied to the communication device.

A conventional communication device having a hands-free function has a structure in which a microphone is disposed on a cone-type speaker, and outputs a voice of a communication partner received by a mobile phone from the cone-type speaker.
On the other hand, the user's voice captured by the microphone is transmitted to the other party's mobile phone or the like via the mobile phone.

However, since the diaphragm built in the cone-shaped speaker is not a flat shape but a bowl shape, the frequency characteristics of the sound output from the front of the speaker and the frequency of the sound output from the back of the speaker The characteristics are different.
Also, the distance from the front of the speaker to the microphone and the distance from the back of the speaker to the microphone are different.
For this reason, even if a microphone is arranged on a cone-type speaker, the sound output from the front of the speaker and the sound output from the back of the speaker are not canceled out at the time of microphone input. .
Therefore, an echo is generated in which the voice of the call partner received by the mobile phone is returned to the mobile phone of the call partner.

  In order to prevent the occurrence of the echo as described above, the conventional communication device includes an inverting circuit (echo cancellation circuit) that inverts the audio signal captured by the microphone, and the audio signal inverted by the inverting circuit An audio signal output from a speaker is synthesized (for example, see Patent Document 1).

JP-A-2-224498 (page 9 to page 10, FIG. 1)

  Since the conventional communication device is configured as described above, the audio signal output from the speaker is canceled by the audio signal inverted by the inverting circuit, and the occurrence of echo can be prevented. However, since the phase of the audio signal output from the inverting circuit is delayed from the phase of the audio signal output from the speaker by the time of the inverting process in the inverting circuit, the phase characteristics and frequency characteristics of both audio signals are reduced. There was a problem that it was not possible to completely match and it was difficult to completely suppress the occurrence of echo.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain an audio device and a communication device that can prevent the occurrence of echoes.

In the acoustic device according to the present invention, magnet plates in which N poles and S poles are alternately magnetized in a stripe shape are arranged on the front side and the back side of the diaphragm, and along the striped magnetic poles in the magnet plate. Thus, the conductor circuit is wired to the diaphragm.
Further, a microphone is disposed at a position where the distance from the surface of the first iron plate and the distance from the surface of the second iron plate coincide with each other, and the opening of the microphone for inputting sound is a distance from the surface of the first iron plate. And the distance from the surface of the second iron plate are linearly applied.

According to the present invention, the magnet plates in which the N poles and the S poles are alternately magnetized in the stripe shape are arranged on the front side and the back side of the diaphragm, and along the stripe-like magnetic poles in the magnet plate. Since the conductor circuit is configured to be wired on the diaphragm, there is an effect that the occurrence of echoes can be prevented.
Further, a microphone is disposed at a position where the distance from the surface of the first iron plate and the distance from the surface of the second iron plate coincide with each other, and the opening of the microphone for inputting sound is a distance from the surface of the first iron plate. And the distance from the surface of the second iron plate are linearly applied, so that there is an effect that the voice input level can be increased without deteriorating the echo cancellation accuracy.

Embodiment 1 FIG.
1 is a perspective view showing a communication apparatus according to Embodiment 1 of the present invention.
2 is a perspective view showing the main part of the acoustic device according to Embodiment 1 of the present invention, and FIG. 3 is a cross-sectional view showing the essential part of the acoustic device according to Embodiment 1 of the present invention.
FIG. 4 is a perspective view showing the microphone of the acoustic device according to Embodiment 1 of the present invention and a plan view showing the surface of the microphone.
In the figure, the diaphragm 1 is a flat plate on which a conductor circuit 4 is formed (for example, printed wiring) on at least one of an upper surface and a lower surface.
The permanent magnet 2 that is the first magnet plate is disposed on the front side of the diaphragm 1 (upper side in the examples of FIGS. 2 and 3), and the N poles and the S poles are alternately magnetized in stripes, A plurality of holes 2a are provided.
The permanent magnet 3 as the second magnet plate is arranged on the back side (lower side in the example of FIG. 3) of the diaphragm 1, and the N pole and the S pole are alternately arranged so that the arrangement of the permanent magnet 2 and the magnetic pole coincides. And a plurality of holes 3a.

The conductor circuit 4 is a printed wiring board formed on the diaphragm 1, and the conductor circuit 4 is wired to the diaphragm 1 along the stripe-shaped magnetic poles of the permanent magnets 2 and 3.
Specifically, the conductor circuit 4 is wired at a position corresponding to the boundary between the N pole and S pole in the permanent magnets 2 and 3 (position corresponding to the holes 2a and 3a of the permanent magnets 2 and 3). The direction of the wiring with the pole on the left and the S pole on the right is opposite to the direction of the wiring with the S pole on the left and the N pole on the right.
The spacer 5 supports the permanent magnet 2 and the permanent magnet 3 so that the diaphragm 1 and the permanent magnets 2 and 3 do not contact each other.
The first iron plate 6 is disposed on the front side of the permanent magnet 2 (upper side in the examples of FIGS. 2 and 3), and has a plurality of holes 6a.
The 2nd iron plate 7 is arrange | positioned in the permanent magnet 3 (lower side in the example of FIG. 3), and the several hole 7a is given.
However, the iron plates 6 and 7 are arranged in close contact with the permanent magnets 2 and 3.

The baffle 8 is a case that houses the diaphragm 1, the permanent magnets 2 and 3, the conductor circuit 4, the spacer 5, and the iron plates 6 and 7. The baffle 8 has a plurality of holes 8a (see FIG. 1A). Or the opening part 8b (refer FIG.1 (b)) is given.
The microphone 9 is disposed at a position where the distance from the front surface of the baffle 8 and the distance from the rear surface of the baffle 8 coincide with each other, and the opening 9 a for inputting sound is the front surface of the baffle 8. And the distance from the surface on the back side of the baffle 8 are linearly applied (see FIGS. 4C and 4D).
In the example of FIG. 1, the microphone 9 is disposed above the baffle 8 because the microphone 9 is directed upward. For example, if the directing direction of the microphone 9 is the right direction, the microphone 9 is disposed on the right side of the baffle 8, and if the directing direction of the microphone 9 is the left direction, the microphone 9 is disposed on the left side of the baffle 8. .
However, when the diaphragm 1 and the permanent magnets 2 and 3 are not accommodated in the baffle 8, the microphone 9 is disposed at a position where the distance from the surface of the iron plate 6 and the distance from the surface of the iron plate 7 coincide. The

The circuit unit 10 includes an amplifier. The amplifier amplifies the audio signal captured by the microphone 9 and outputs the audio signal to the mobile phone 11, while the audio signal received by the mobile phone 11 is output. Processing such as amplification and outputting the audio signal to the conductor circuit 4 is performed.
The mobile phone 11 that is an information communication terminal receives the voice signal of the other party and outputs the voice signal to the amplifier of the circuit unit 10, while the voice signal amplified by the amplifier of the circuit unit 10 receives the voice signal amplified by the other party. Send to etc.

Next, the operation will be described.
When the mobile phone 11 receives an audio signal transmitted from the mobile phone of the other party, the mobile phone 11 outputs the audio signal to the amplifier of the circuit unit 10.
When the amplifier of the circuit unit 10 receives the voice signal of the other party from the mobile phone 11, the amplifier amplifies the voice signal and outputs the amplified voice signal to the conductor circuit 4.
Thereby, a current flows through the conductor circuit 4 in the direction as shown in FIGS. 2 and 3, for example.

When current flows in the direction as shown in FIGS. 2 and 3, a magnetic field is formed by the permanent magnets 2, 3 and the iron plates 6, 7. A force acts, and the diaphragm 1 vibrates upward.
On the other hand, when a current flows in a direction opposite to the direction shown in FIGS. 2 and 3, a force acts downward of the diaphragm 1 according to Fleming's left-hand rule, and the diaphragm 1 vibrates downward.
Due to the vibration phenomenon of the diaphragm 1, the voice signal of the other party is reproduced, and the voice of the other party is output through the permanent magnet 2, the iron plate 6, and the holes 2a, 6a, 8a (or the opening 8b) of the baffle 8. At the same time, the voice of the other party is output through the holes 3a, 7a, 8a (or the opening 8b) of the permanent magnet 3, the iron plate 7, and the baffle 8.

  Here, as shown in FIG. 1, the microphone 9 is disposed at a position where the distance from the front surface of the baffle 8 and the distance from the rear surface of the baffle 8 coincide with each other. Since the shape of 1 is a planar shape, as shown in FIG. 5, the permanent magnet 2, the iron plate 6, and the baffle 8 are output from the holes 2a, 6a, 8a (or the opening 8b), and the opening 9a of the microphone 9 is output. And the sound pressure frequency characteristics of the sound input to the microphone 9, the sound output from the holes 3 a, 7 a, 8 a (or the opening 8 b) of the permanent magnet 3, the iron plate 7, and the baffle 8 and input to the opening 9 a of the microphone 9. Is consistent with the sound pressure frequency characteristics.

However, when the opening 9a of the microphone 9 is provided as shown in FIGS. 4C and 4D, the sound pressure frequency characteristics of the sound coincide with each other, but as shown in FIG. If so, the sound pressure frequency characteristics of the voice do not match.
The reason is as follows.
In a general condenser microphone, as shown in FIG. 4A, a large number of openings are provided on the surface of the microphone 9. When a large number of openings are provided in this way, there are openings provided at positions where the distance from the front surface of the baffle 8 and the distance from the back surface of the baffle 8 are different.
For example, in the opening provided at the front end, the distance from the front surface of the baffle 8 is shorter than the distance from the rear surface of the baffle 8.
In the opening provided at a position where the distance from the front surface of the baffle 8 and the distance from the rear surface of the baffle 8 are different, the permanent magnet 2, the iron plate 6, and the holes 2a, 6a, The sound pressure frequency characteristic of the sound from 8a (or opening 8b) and the sound pressure frequency characteristic of the sound from holes 3a, 7a, 8a (or opening 8b) of permanent magnet 3, iron plate 7 and baffle 8 do not match. become.

  On the other hand, as shown in FIG. 4B, when only one opening is provided at the center of the microphone 9, the openings 2a, 6a, baffle 8 of the permanent magnet 2, the iron plate 6, and the baffle 8 are provided in the opening. The sound pressure frequency characteristic of the sound from 8a (or the opening 8b) and the sound pressure frequency characteristic of the sound from the holes 3a, 7a, 8a (or the opening 8b) of the permanent magnet 3, the iron plate 7, and the baffle 8 match. However, since the opening area is small, the user's voice may not be sufficiently captured, and the voice input level may be reduced.

Therefore, in the first embodiment, as shown in FIG. 4C, a plurality of inputs are provided at positions where the distance from the front surface of the baffle 8 and the distance from the rear surface of the baffle 8 coincide. An opening 9 a in which the holes are linearly arranged is provided on the surface of the microphone 9. Thereby, the voice input level can be increased without deteriorating the echo cancellation accuracy.
Alternatively, as shown in FIG. 4 (d), the slit-shaped opening 9 a is placed on the microphone 9 at a position where the distance from the front surface of the baffle 8 coincides with the distance from the rear surface of the baffle 8. Even if it is applied to the surface, the voice input level can be increased without deteriorating the accuracy of echo cancellation.

When the speaker is a cone type, as shown in FIG. 6, the sound pressure frequency characteristics of the sound output from the front surface of the speaker and input to the microphone, and the sound output from the rear surface of the speaker and input to the microphone However, in the first embodiment, the sound output from the holes 2a, 6a, 8a of the permanent magnet 2, the iron plate 6, and the baffle 8 and input to the microphone 9 as described above. 7 and the sound pressure frequency characteristics of the sound output from the holes 3a, 7a, and 8a of the permanent magnet 3, the iron plate 7, and the baffle 8 and input to the microphone 9 are shown in FIG. In this way, both audio signals cancel each other when input to the microphone 9.
Therefore, even if the voice of the other party is output from the speaker, it is not input to the microphone 9 and no echo is generated.

On the other hand, the user's voice is captured by the microphone 9, and the amplifier of the circuit unit 10 amplifies the voice signal captured by the microphone 9 and outputs the voice signal to the mobile phone 11.
Thereby, since the mobile phone 11 transmits the audio signal amplified by the amplifier to the mobile phone of the other party, the user's voice is delivered to the other party.

As apparent from the above, according to the first embodiment, the permanent magnets 2 and 3 in which the N poles and the S poles are alternately magnetized in a stripe shape are arranged on the front side and the back side of the diaphragm 1 respectively. In addition, since the configuration is such that the diaphragm 1 is wired along the stripe-shaped magnetic poles of the permanent magnets 2 and 3, there is an effect that the generation of echoes can be prevented.
Further, according to the first embodiment, the microphone 9 is arranged at a position where the distance from the front surface of the baffle 8 and the distance from the rear surface of the baffle 8 coincide with each other, and the microphone 9 that inputs sound is input. Since the opening 9a is linearly formed at a position where the distance from the front surface of the baffle 8 and the distance from the rear surface of the baffle 8 coincide with each other, the echo cancellation accuracy is deteriorated. Without being able to increase the voice input level.

Moreover, in this Embodiment 1, since the diaphragm 1, the permanent magnets 2 and 3, the conductor circuit 4, the spacer 5, and the iron plates 6 and 7 are accommodated in the baffle 8, the holes 6a, There is an effect that the sound pressure frequency characteristic of the sound output from 7a can be widened.
That is, when the diaphragm 1, the permanent magnets 2 and 3, the conductor circuit 4, the spacer 5, and the iron plates 6 and 7 are not housed in the baffle 8, as shown by the dotted line in FIG. The sound pressure frequency characteristic is degraded, and the user can hear a metallic voice.
On the other hand, when the diaphragm 1, the permanent magnets 2 and 3, the conductor circuit 4, the spacer 5, and the iron plates 6 and 7 are accommodated in the baffle 8, as shown by the solid line in FIG. Since the sound pressure frequency characteristics do not deteriorate, the voice of the other party can be faithfully reproduced and heard by the user.

Embodiment 2. FIG.
In the first embodiment, the microphone 9 whose directing direction is the upward direction is shown as being disposed above the baffle 8, but the directing direction is the planar direction of the diaphragm 1 as shown in FIG. The microphone 9 may be disposed in the hole 1 a provided in the central portion of the diaphragm 1.
When the microphone 9 whose directing direction is the upward direction is arranged on the upper part of the baffle 8, for example, depending on the material and shape of the ceiling and the distance to the ceiling, the sound signal of the microphone 9 is influenced by the influence of the reverberant sound from the ceiling. Cancellation accuracy may deteriorate.

However, when the microphone 9 is disposed in the hole 1a provided in the central portion of the diaphragm 1 (in the example of FIG. 9, the microphone 9 is disposed on the buffer material 12 in order to reduce the influence of the vibration of the baffle 8). The volume of the sound output from the diaphragm 1 and directly input to the microphone 9 is extremely larger than the reverberation sound of the ceiling, so that deterioration of the cancellation accuracy of the sound signal in the microphone 9 is prevented. be able to.
Therefore, according to the second embodiment, it is possible to improve the accuracy of suppressing the occurrence of echoes as compared with the first embodiment.

In the example of FIG. 9, the microphone 9 is directed upward. However, the directing direction only needs to be the planar direction of the diaphragm 1. For example, the microphone 9 has a directing direction to the right, It may be left or downward.
In the example of FIG. 9, the baffle 8 viewed from the front side has a quadrangular shape. However, the shape is not limited to this, and may be a circular shape, for example.
In the example of FIG. 9, the number of the baffles 8 is one, but a plurality of the baffles 8 may be collected and the microphone 9 may be arranged at the center.

In the example of FIG. 9, the microphone 9 is disposed in the hole 1 a provided in the central portion of the diaphragm 1. However, the microphone 9 whose directing direction is the planar direction of the diaphragm 1 is disposed in the diaphragm 1. You may make it do.
In the example of FIG. 9, the microphone 9 is disposed in the hole 1 a provided in the center of the diaphragm 1, but as illustrated in FIG. 10, the diaphragm 1, the permanent magnets 2, 3, The conductor circuit 4, the spacer 5, and the iron plates 6 and 7 may be housed in the center portion of the baffle 8, and the baffle 8 may be provided with a notch portion 8 c so that the microphone 9 is disposed in the notch portion 8 c of the baffle 8.
As shown in FIG. 11, when the notch 8c of the baffle 8 is expanded in a trumpet shape, the sound input level in the microphone 9 can be increased.

  In the first and second embodiments, the baffle 8 is directly mounted on the circuit unit 10. For example, as shown in FIGS. 12 and 13, the baffle 8 is connected to the circuit unit via the pole 13. 10 may be placed.

Embodiment 3 FIG.
In the first and second embodiments, the surface of the microphone 9 is provided with the opening 9a. However, there are many microphone covers on the surface where the opening 9a for inputting sound is linearly provided. It may be made to be covered with the main body of the microphone 9 to which the opening part is given.
Also in this case, there is an effect that the voice input level can be increased without deteriorating the echo cancellation accuracy. For example, if a mismatch in sound pressure frequency characteristics is recognized after the microphone 9 is installed, it is possible to perform fine adjustment to match the sound pressure frequency characteristics by matching the position of the microphone cover with respect to the main body of the microphone 9. There is an effect.

Embodiment 4 FIG.
In the first to third embodiments, the amplifier of the circuit unit 10 is connected to the mobile phone 11. However, the present invention is not limited to this. For example, the amplifier of the circuit unit 10 is connected to the interphone. Also good.
In this case, the amplifier of the circuit unit 10 amplifies the user's voice signal captured by the microphone 9 and outputs the voice signal to the interphone.
Thereby, a user's audio | voice can be delivered to a visitor through the interphone installed, for example in the gate of a house.
On the other hand, the voice signal of the visitor captured by the interphone is amplified and the voice signal is output to the conductor circuit 4.
Thereby, the occurrence of echoes can be prevented as in the first to third embodiments.

It is a perspective view which shows the telephone call apparatus by Embodiment 1 of this invention. It is a perspective view which shows the principal part of the audio equipment by Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the audio equipment by Embodiment 1 of this invention. It is the perspective view which shows the microphone of the audio equipment by Embodiment 1 of this invention, and the top view which shows the surface of a microphone. It is explanatory drawing which shows the sound pressure frequency characteristic of the audio | voice output from the diaphragm 1 and input into a microphone. It is explanatory drawing which shows the sound pressure frequency characteristic of the audio | voice output from a cone type speaker and input into a microphone. It is explanatory drawing which shows echo cancellation. It is explanatory drawing which shows the sound pressure frequency characteristic of the audio | voice when the case where it accommodates in a baffle, and when it is not accommodated. It is a perspective view which shows the telephone call apparatus by Embodiment 2 of this invention. It is a perspective view which shows the other telephone apparatus by Embodiment 2 of this invention. It is a perspective view which shows the other telephone apparatus by Embodiment 2 of this invention. It is a perspective view which shows the other telephone apparatus by Embodiment 2 of this invention. It is a perspective view which shows the other telephone apparatus by Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Diaphragm, 1a hole, 2 Permanent magnet (1st magnet plate), 2a hole, 3 Permanent magnet (2nd magnet plate), 3a hole, 4 Conductor circuit, 5 Spacer, 6 Iron plate (1st iron plate) , 6a hole, 7 iron plate (second iron plate), 7a hole, 8 baffle (case), 8a hole, 8b opening, 8c notch, 9 microphone, 9a opening, 10 circuit part, 11 mobile phone (information communication) Terminal), 12 cushioning material, 13 poles.

Claims (10)

  Arranged on the front side of the diaphragm, N poles and S poles are alternately magnetized in a stripe shape, and are arranged on the back side of the diaphragm with a plurality of holes. A second magnet plate having a plurality of holes and N poles and S poles alternately magnetized in a stripe shape so that the arrangement of the magnetic poles and the first magnet plate coincides with each other. The conductor circuit wired to the diaphragm along the stripe-shaped magnetic poles in the first and second magnet plates and the front side of the first magnet plate are provided with a plurality of holes. The first iron plate, the second iron plate disposed on the back side of the second magnet plate and provided with a plurality of holes, the distance from the surface of the first iron plate, and the second The first iron plate is arranged at a position where the distance from the surface of the iron plate coincides, and the opening for inputting sound is the first iron plate Acoustic device including a microphone that is applied in a straight line to a position where the distance and matches from a distance and the second surface of the iron plate from the surface.   The acoustic device according to claim 1, wherein a slit-shaped opening is provided in the microphone.   2. The acoustic device according to claim 1, wherein an opening in which a plurality of input holes are linearly arranged is provided on the microphone.   2. The acoustic apparatus according to claim 1, wherein a microphone cover, in which an opening for inputting sound is linearly formed, is covered with a main body of the microphone.   5. The diaphragm according to claim 1, wherein the diaphragm, the conductor circuit, the first and second magnet plates, and the first and second iron plates are housed in a baffle. Acoustic device.   6. The acoustic apparatus according to claim 5, wherein a microphone whose directing direction is upward is disposed on an upper part of the baffle.   6. The microphone according to claim 1, wherein a microphone whose directing direction is a planar direction of the diaphragm is disposed in a hole provided in a central portion of the diaphragm. Sound equipment.   The acoustic device according to any one of claims 1 to 5, wherein a microphone whose directing direction is a planar direction of the diaphragm is arranged on the diaphragm.   Arranged on the front side of the diaphragm, N poles and S poles are alternately magnetized in a stripe shape, and are arranged on the back side of the diaphragm with a plurality of holes. A second magnet plate having a plurality of holes and N poles and S poles alternately magnetized in a stripe shape so that the arrangement of the magnetic poles and the first magnet plate coincides with each other. The conductor circuit wired to the diaphragm along the stripe-shaped magnetic poles in the first and second magnet plates and the front side of the first magnet plate are provided with a plurality of holes. The first iron plate, the second iron plate disposed on the back side of the second magnet plate and provided with a plurality of holes, the distance from the surface of the first iron plate, and the second The first iron plate is arranged at a position where the distance from the surface of the iron plate coincides, and the opening for inputting sound is the first iron plate An audio device having a microphone linearly provided at a position where the distance from the surface and the distance from the surface of the second iron plate coincide with each other, and amplifies the audio signal captured by the microphone; A communication device comprising: an amplifier that outputs an audio signal to an information communication terminal, amplifies the audio signal received by the information communication terminal, and outputs the audio signal to the conductor circuit. Arranged on the front side of the diaphragm, N poles and S poles are alternately magnetized in a stripe shape, and are arranged on the back side of the diaphragm with a plurality of holes. A second magnet plate having a plurality of holes and N poles and S poles alternately magnetized in a stripe shape so that the arrangement of the magnetic poles and the first magnet plate coincides with each other. The conductor circuit wired to the diaphragm along the stripe-shaped magnetic poles in the first and second magnet plates and the front side of the first magnet plate are provided with a plurality of holes. The first iron plate, the second iron plate disposed on the back side of the second magnet plate and provided with a plurality of holes, the distance from the surface of the first iron plate, and the second The first iron plate is arranged at a position where the distance from the surface of the iron plate coincides, and the opening for inputting sound is the first iron plate An audio device having a microphone linearly provided at a position where the distance from the surface and the distance from the surface of the second iron plate coincide with each other, and amplifies the audio signal captured by the microphone; A communication device comprising: an amplifier that outputs an audio signal to an interphone, amplifies the audio signal captured by the interphone, and outputs the audio signal to the conductor circuit.

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