JPH02288455A - Talking device for conference - Google Patents

Abstract

PURPOSE:To prevent voice of a speaker from introducing crosstalk to a microphone by placing a speaker to a position where sound is received omnidirectionally within a plane including 2 directivity microphones or over and the sensitivity is minimized and making the direction coincident with the sound transmission direction. CONSTITUTION:The device consists of a main body 2 having a speaker 1 for talking and one sub case 3 or over removable therefrom, and two directional microphones 10, 11 or over are mounted to the one sub case 3 or over. In this case, the device is configurated such that it is possible for nondirectivity sound reception within a plane including the directivity microphones 10, 11, the position minimizing the sensitivity is a position of the said speaker 1 and the direction minimizing the sensitivity is made coincident with the sound transmission direction of the speaker 1. That is, the directivity 6 within a plane including >=two microphones 10 is omnidirectional in this arrangement and a region 62 is a region where its sensitivity is minimized in a direction at a right angle with respect to a face including the two microphones 10 or over. Thus, the sound from the speaker 1 does not introduce crosstalk to the microphones 10.

Description

[Detailed Description of the Invention] [Summary] Regarding a conference call device used in an audio conference system, etc., the present invention relates to a conference call device used in an audio conference system, etc., which prevents audio from a speaker from being transmitted to a microphone through a housing, and allows a large number of people to participate in an audio conference. For the purpose of providing a telephone communication device, it consists of a main body having a speaker for receiving calls, and one or more sub-casings or two or more sub-casings that are removable from the main body, and the one or more sub-casings are removable from the main body. In the case of a sub-housing, two or more directional microphones, and in the case of two or more sub-housings, one or more microphones, in any case within a plane containing two or more directional microphones. The speaker is configured to be installed so that omnidirectional sound reception is possible, the position of minimum sensitivity is the position of the speaker, and the direction of minimum sensitivity coincides with the sound transmission direction of the speaker.

[Industrial application field]

The present invention relates to an improvement in a conference call device used in an audio conference system or the like.

Since audio conferencing systems that use wall-mounted speakers and stand-type microphones are large-scale, conference call devices (including public address telephones) with speakers and microphones are used to facilitate audio conferencing. ing.

It is desired that this conference call device be able to output sound of better quality than the speaker without any interference from the speaker through the microphone attachment casing, and to be able to accommodate a larger number of people in a conference.

[Conventional technology]

FIG. 8 is a top view and circuit diagram of a conventional conference call device,
FIG. 9 is a perspective view and a circuit diagram of a conventional loudspeaker telephone.

When a conventional conference call device is viewed from above, it is as shown in FIG. It is attached to the four corners of the main body 2, so that, for example, four people can easily hold an audio conference with the other party.

The circuit in this case is shown in (B), which includes an amplifier 31 for amplifying the signals from the four microphones, an amplifier 32 for amplifying the signal to the speaker 1, and a circuit for preventing howling. It consists of an audio switch 30 that inserts attenuation on the receiving side when transmitting a voice, and on the transmitting side when receiving a voice.

In this voice switch 30, the smaller the amount of attenuation inserted, the less disconnection occurs at the beginning of speech, and the quality of the call is improved.

A public address telephone is a telephone that is equipped with a speaker and a microphone so that it can be used as a telephone as well as a conference call device. Figure 9 (λ
), one speaker 1 is attached to the housing 6, and a directional microphone 16 is attached to the handset 7 so that the sound from the speaker 1 does not go around, so that about two people can talk to the other party hands-free. This makes it easy to hold audio conferences.

The circuit of the conference call device of this public address telephone is shown as (
As shown in B), there is an amplifier 31 that amplifies the signal from the microphone 16, an amplifier 32 that amplifies the signal to the speaker 1, and an amplifier 31 that amplifies the signal from the microphone 16, an amplifier 32 that amplifies the signal sent to the speaker 1, and an amplifier 31 that amplifies the signal from the microphone 16, and an amplifier 32 that amplifies the signal sent to the speaker 1. The telephone 34 is activated by a switch 35 provided on the operation panel 8 shown in FIG. It can be used interchangeably with the side.

[Problem to be solved by the invention]

However, in the conventional conference call device, as shown in FIG. 8, the microphone 15 and the speaker 1 are attached to the same main body 2. Since acoustic coupling occurs, it is necessary to increase the amount of attenuation inserted by the audio switch 30, resulting in a problem that the beginning of the conversation is often cut off and the quality of the call is poor, making it difficult to hear the voice.

In conventional public address telephones, as shown in FIG. 9, the microphone 16 is attached to a handset 7 that is separate from the housing 6 to which the speaker 1 is attached, so there is no interference through the housing, but the directional microphone Since there is only one, there is a problem that only a small number of people, about two people, can participate in a meeting.

SUMMARY OF THE INVENTION An object of the present invention is to provide a conference call device that allows a large number of people to participate in an audio conference without the sound from a speaker being transmitted to a microphone through a housing.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

As shown in FIG. 1(A), it consists of a main body 2 having a speaker 1 for receiving calls, and one or more sub-casings 3 that can be attached to and detached from the main body 2 and the sub-casings. Two or more directional microphones 10.11 are placed in the sub-casing 3 of the 2 or more directional microphones 10.11 at a position where omnidirectional sound reception is possible and the sensitivity is minimum within a plane including the two or more directional microphones 10.11. is the position of the speaker 1, and the speaker 1 is installed so that the direction of minimum sensitivity coincides with the sound transmission direction of the speaker 1.

Or, as shown in FIG. 1(B), it consists of a main body 2 having a speaker 1 for receiving calls, and two or more sub-casings 3.4 that can be attached to and detached from the main body 2 and the sub-casings. One or more directional microphones 12 and 13 are installed in each of the sub-casings 3.4, and are capable of receiving omnidirectional sound within a plane including the one or more directional microphones 12.13, and have a minimum sensitivity. The speaker 1 is installed so that the position thereof is the position of the speaker 1, and the direction in which the sensitivity is minimum coincides with the sound transmission direction of the speaker 1.

[For production]

The conference call devices of the present invention shown in FIGS. 1(A) and 1(B) each use two or more microphones.

If two or more microphones 10 are used, for example, FIG. 7(a) (
If arranged as shown in b), the directivity in the area containing two or more microphones 10 can be made omnidirectional as shown by 61, and the area shown by 62 can be made perpendicular to the area including two or more microphones 10. The lowest sensitivity is in the direction of .

Therefore, if the speaker 1 is installed in the lowest sensitivity area and the direction of sound transmitted from the speaker 1 is made to match the direction of the lowest sensitivity, the sound from the speaker 1 will not go around to the microphone 10, and Omnidirectional sound reception becomes possible.

Note that the overall directivity at this time varies depending on the distance between the microphones and the distance between the microphone and the speaker.
Omnidirectional sound reception is possible even if the distance between the microphones is 30 cm and the distance between the microphones and the speaker is about 50 cm.

Of course, as the number of microphones increases, the accuracy of omnidirectionality improves in this respect.

Therefore, as shown in FIG. 1(A), two or more directional microphones 10.11 are installed in one or more sub-casings 3 which are removable from the main body 2 and the sub-casings. The directional microphone 10.11 is capable of receiving omnidirectional sound within a plane, and the position where the sensitivity is minimum is the position of the speaker 1, and the direction where the sensitivity is minimum is the position of the speaker 1. Install it so that it matches the direction of sound transmission.

Or, as shown in FIG. 1(B), one or more directional microphones 12 and 13 are installed in each of two or more sub-casings 3.4 that are removable from the main body 2. The speaker 1 is located at the position where omnidirectional sound reception is possible within a plane including one or more directional microphones 12 and 13 and where the sensitivity is minimum.
and the direction where the sensitivity is minimum is the speaker 1.
Install it so that it matches the sound transmission direction. −
In this way, the microphone 10.
11, 12, and 13, and the main body 2 to which the speaker 1 is attached, the microphone 10,
Since the sub-casing 3.4 to which 11.12.13 is attached is a sub-casing, there is no going around through the casing,
1. The insertion attenuation due to the voice switch is small, and the quality of the call is improved, and omnidirectional sound reception is possible. A large number of people will be able to participate in audio conferences.

〔Example〕

FIG. 2 is an external view of a conference call device according to a first embodiment of the present invention, FIG. 3 is an external view of a loudspeaker telephone according to a second embodiment of the present invention, and FIG. FIG. 5 is an external view of a public address telephone capable of making three-party calls using two handsets according to the fourth embodiment of the present invention, and FIG. It is.

FIG. 2(a) is a top view of the conference call device according to the embodiment of the present invention, FIG. 2(b) is a side view, and FIG. 2(c) is a diagram showing that the sub-casing 5 is a body-worn type. be.

The conference call device shown in FIG. 2 corresponds to the conventional conference call device shown in FIG. The eight microphone modules 14 are attached to the circular main body 2, and as explained earlier with reference to FIG. The speaker 1 is mounted so that the position where the sensitivity is the minimum is the position where the speaker 1 is possible, and the direction where the sensitivity is the minimum is the same as the sound transmission direction of the speaker 1.

In this way, the sound from speaker 1 can be prevented from circulating spatially and through the casing, so the amount of attenuation inserted by the audio switch can be prevented from circulating through the casing, compared to conventional conference call devices. Since it can be done without any loss, the number of disconnections at the beginning of the conversation is reduced, the quality of the call is improved, the voice is easier to hear, and a large number of people can participate in the audio conference.

Additionally, a clip 7 is provided for attaching the removable sub-casing 5 equipped with the microphone module 14 to the body as shown in (C).
0 and a concave portion 72 that is inserted into the convex portion 71, the microphone 14 can be worn on the body and the voice can be input manually.

The circuit is shown in Figure 8, and the number of microphones is 8.
It has become an individual.

The public address telephone shown in FIG. 3 corresponds to the conventional public address telephone shown in FIG. 9, and has two microphones 16 and 17 attached to the handset 7. , within a plane including the two microphones 16 and 17, the position where omnidirectional sound reception is possible and the minimum sensitivity is the position of the speaker l, and the direction where the sensitivity is the minimum is the direction of the transmission of the speaker 1. It is installed so that it matches the direction of the sound.

In this way, when used as a conference call device, a large number of people can participate in an audio conference, compared to the conventional loudspeaker telephone.

The circuit is the one shown in Figure 9, with two microphones.

The public address telephone shown in Figure 4 has a handset of 7-1.7-
There are 2 and 2, and when used as a telephone, it is a public address telephone that can make three-way calls, and the main body 6 is a handset in the sub-casing? -1
, 7-2 are each equipped with one microphone 18, 19, and as explained earlier with reference to FIG. Moreover, the speaker 1 is installed so that the position where the sensitivity is minimum is the position of the speaker 1, and the direction where the sensitivity is the minimum coincides with the sound transmission direction of the speaker 1. In this way, compared to the conventional loudspeaker telephone shown in FIG.
When used as a conference call device, a large number of people can participate in an audio conference. FIG. 5(a) is a top view of a public address telephone according to an embodiment of the present invention, FIG. 5(b) is a side view, and FIG.
FIG. 2 is a diagram showing details of the herad set.

The public address telephone shown in Figure 5 has a Herad set of 40°41 and 2.
This is a public address telephone that can make three-way calls when used as a telephone.The housing 6 of this phone is different from the sub-casing Herad set 40.
One microphone module 20.21 is attached to each of the microphones 41, and as explained earlier with reference to FIG. 7, omnidirectional sound reception is possible within a plane including the two microphones 20.21, and The speaker 1 is installed so that the position where the sensitivity is minimum is the position of the speaker 1, and the direction where the sensitivity is minimum is the same as the sound transmission direction of the speaker 1.

The circuit is the same as the public address telephone shown in FIG.

In this way, compared to the conventional example of the public address telephone shown in FIG. 9, when used as a conference call device, a large number of people can participate in the audio conference.

As shown in (C), the headset 40, 41 can be attached with a foldable part 42 having a microphone, and can be attached to the head by taking out a part 43 from the housing of the headset 40. .

Further, the portion 42 holding the microphone is adapted to be attached to the housing 6.

Therefore, during a voice conference, it is possible to switch to the telephone side and talk to the person on the other party's telephone side in a low voice.

Figure 6 shows a circuit in which a very small omnidirectional electret microphone of about 5 mm is used as a directional microphone.Two omnidirectional electret microphones 50 are used, and one output is By inputting one signal directly to the adder 52 and inputting the other to the adder 52 via the delay element 51, the output of the adder 52 can be made into a directional microphone output.

In addition, the hand 7 l-7, 7-1゜7-2 in Figures 3 to 5
．． The headset 40, 41 may be of a cordless type using radio wave or infrared transmission, and in this case, a wireless microphone is also used as the microphone.

Furthermore, if a wireless microphone is used as the microphone 14 in FIG. 2, the sub-casing 5 can be made wireless when worn on the body.

〔Effect of the invention〕

As described above in detail, the present invention has the effect of preventing the sound from the speaker from going around to the microphone through the housing, improving the quality of the call, and allowing a large number of people to participate in the audio conference.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle of the present invention; Fig. 2 is an external view of a conference call device according to a first embodiment of the present invention; Fig. 3 is an external view of a public address telephone according to a second embodiment of the present invention. , Fig. 4 is an external view of a loudspeaker telephone that can use two handsets according to the third embodiment of the present invention, and Fig. 5 shows an external view of a public address telephone that can use two handsets according to the fourth embodiment of the present invention. An external view of a loudspeaker telephone that can make calls. Figure 6 is a block diagram showing a circuit when one example of a non-directional electret microphone is used as a directional microphone. Figure 7 is a block diagram showing a circuit where one example of a directional microphone is used as a directional microphone. Figure 8 is a top view and circuit diagram of a conventional conference call device; Figure 9 is a perspective view and a circuit diagram of a conventional loudspeaker telephone. It is a circuit diagram. In the figure, 1 is a speaker, 2 is a main body, 3.4.5 is a sub-casing, 6 is a housing, 7.7-1.7-2 is a handset, 8 is a control panel, 10 to 20.50 are microphones, 30 is an audio switch, 31.32 is an amplifier, 33 is a bibrid, 34 is a telephone, 35 is a switch, and 40.41 is a herad set. JoaH's λ ball V figure and half 2 figure graduation Otome 7 hard

Claims (1)

[Claims] (1.) A main body (2) having a speaker (1) for receiving calls.
and one or more sub-casings (3) which are separate from the main body (2) and are removable from the main body (2), and the one or more sub-casings (3) have two or more directivity The position of the speaker (1) is the position where the microphone (10, 11) can receive omnidirectional sound within a plane including the two or more directional microphones (10, 11) and has the minimum sensitivity. A conference call device characterized in that the speaker (1) is installed so that the direction in which the sensitivity is minimum coincides with the sound transmission direction of the speaker (1). (2.) Main body (2) with speaker (1) for receiving calls
and two or more sub-casings (3, 4) separate from the main body (2) and detachable from the main body (2), each of the sub-casings (3, 4) having one or more directional The directional microphone (12, 13) is located at the position of the speaker (1) where omnidirectional sound reception is possible within a plane including the one or more directional microphones (12, 13) and where the sensitivity is minimum. 1. A conference call device, characterized in that the speaker (1) is mounted so that the direction of minimum sensitivity coincides with the sound transmission direction of the speaker (1).