JPH04312098A - Presentation system - Google Patents

Abstract

PURPOSE:To prevent the generation, etc., of howling due to the phenomenon that the sound volume to hear is different according to the positional relation of a speaker and a listener and the imperfect adjustment of the volume. CONSTITUTION:When a speaker 1 speaks to a microphoine MC1, a control part 21 reads the pattern of the sound volume level in accordance with the distance from the microphone MC1 to respective speakers SP1-SP6 from a storage part 22. Based on this pattern, the control part 21 controls respective attenuators ATT1-ATT6. In accordance with the control, respective attenuators ATT1-ATT6 adjust the volume of respective speakers SP1-SP6. Thus, to respective listners 2-7, the optimum volume is supplied.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a presentation system used in, for example, a relatively large conference room.
In particular, it concerns its acoustic function.

0002

2. Description of the Related Art A presentation is a process in which a speaker presents his or her project plan to a plurality of listeners at a planning meeting or the like. Such presentations are often held in a relatively large conference room (presentation room). For this reason, the conference room is usually equipped with a presentation system that has multiple microphones placed at predetermined positions on the table and multiple speakers installed at predetermined positions such as the ceiling or wall. The voice uttered by a person into a microphone in front of him or her is output from each speaker via an amplifier, and is supplied to each listener.

0003

[Problems to be Solved by the Invention] However, in the conventional presentation system as described above, the volumes emitted from the plurality of speakers are all at the same level, and it is difficult to deliver the sound at a uniform volume to all listeners in the conference room. There was no thought of supplying it. For this reason, conventionally, listeners who are close to the speaker receive both the voice directly from the speaker and the voice from the speaker, but listeners who are far from the speaker receive only the voice from the speaker. There was a problem in that the volume heard differed depending on the positional relationship between the speaker and the listener. Additionally, in the past, if the optimal volume was set at a distance from the speaker, the sound from speakers near the speaker would be too loud, and the microphone would pick up the sound, which would easily cause howling. There was a problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a presentation system that can prevent the phenomenon in which the audible volume differs depending on the positional relationship between the speaker and the listener, and the occurrence of howling due to insufficient adjustment of the volume. do.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a plurality of microphones arranged at predetermined positions, a plurality of speakers arranged at predetermined positions,
In a presentation system that outputs audio input to each of the microphones from each of the speakers,
A volume adjusting means for adjusting the volume of each of the speakers, a storage means for storing the volume level of each of the speakers according to a distance from each of the microphones to each of the speakers, and a sound from each of the microphones is inputted. and a control means for controlling the volume adjustment means by referring to the storage means according to the microphone.
A calculation means may be provided for changing the control of the volume adjustment means by the control means in accordance with the volume of the sound input to each of the microphones.

[0006]

[Operation] When the speaker speaks into the microphone, the control means reads from the storage means a volume level pattern corresponding to the distance from the microphone to each speaker. The control means controls the volume adjustment means based on this pattern. The volume adjusting means adjusts the volume of each speaker in accordance with the control.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the presentation system according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of this presentation system. A speaker table 11 facing the speaker 1 and a listener table 12 facing a plurality of listeners 2 to 7 are provided in the conference room. Multiple microphones MC2
~MC7 are arranged at approximately equal intervals. A plurality of speakers SP1 to SP6 are installed at approximately equal intervals on the ceiling of the conference room. A plurality of amplifiers 13 are connected to the output side of each of the microphones MC1 to MC7, and each speaker SP1 to SP6 is connected to each of these amplifiers 13, respectively.

[0008] This presentation system includes a volume adjustment section, a control section 21, a storage section 22, and a calculation section 23. The volume adjustment section can be configured by a plurality of attenuators ATT1 to ATT6, and the control section 21, storage section 22, calculation section 23, etc. can be configured by a computer.

First, each attenuator ATT1 to ATT6
are provided in front of each amplifier 13, respectively, and the control unit 2
Each speaker SP1 to SP according to the volume control signal from
Adjust the volume of 6.

[0010] Next, the storage unit 22 stores information about each microphone MC.
The volume level patterns of the speakers SP1 to SP6 are stored in accordance with the distances from the speakers SP1 to SP6 to the speakers SP1 to SP6. FIG. 2 shows the contents of the pattern stored in the storage unit 22. For example, the distances from the microphone MC1 to each of the speakers SP1 to SP6 are SP1, SP6, SP2, SP5, SP3, and SP4.
If the volume increases in the order of 1 and 2, the volume level increases in this order.
, 3, 4, 5, and 6. Also, the distance from microphone MC4 to each speaker SP1 to SP6 is
If SP3, SP2, SP4, SP5, SP1, and SP6 become longer in this order, the volume level becomes 1, 2, and 3 in this order.
, 4, 5, and 6. Similarly, the volume levels of the other microphones MC2, MC3, MC5 to MC7 are set according to the distances to the speakers SP1 to SP6. However, the above numerical value represents the degree of the volume level, and does not necessarily mean twice, triple, etc.

[0011] The control unit 21 also controls each microphone MC.
1 to MC7, depending on the microphone from which the audio is input, with reference to the pattern stored in the storage unit 22,
A volume control signal is sent to each attenuator ATT1 to ATT6 to control each attenuator ATT1 to ATT6. Note that audio signals are sent from each microphone MC1 to MC7 to the control unit 21, and from the control unit 21 to each attenuator ATT.
The volume control signals to ATT1 to ATT6 are transmitted independently.

[0012] Furthermore, the calculation unit 23
Control unit 2 according to the volume of audio input to C1 to MC7.
1, calculates an optimal volume value based on the signal, and sends a volume change signal to the control unit 21.

According to the presentation system configured as described above, for example, the speaker 1 uses the microphone M
When the user speaks toward C1, the audio signal from the microphone MC1 is input to the control unit 21. The control unit 21 connects the microphone MC1 to each of the speakers SP1 to SP.
Storage unit 2 stores volume level patterns according to distances up to 6.
Read from 2. Based on this read pattern, the control unit 21 sends a volume control signal to each attenuator ATT1 to ATT6. In response to these volume control signals, each attenuator ATT1 to ATT6 controls each speaker SP1.
~Adjust the volume of SP6.

Therefore, since the volume of each speaker SP1 to SP6 is adjusted according to the distance from the microphone MC1, listeners 2 and 7 who are near the speaker 1 can hear the sound from the nearby speakers SP1 and SP6. The volume becomes low, and for listeners 4 and 5 who are far away from the speaker 1, the volume from nearby speakers SP3 and SP4 increases. Thereby, each of the listeners 2 to 7 can listen to the voice of the speaker 1 at an optimal volume. Further, there is no problem that the microphone MC1 of the speaker 1 causes howling due to sounds from the nearby speakers SP1 and SP6.

[0015] For example, when the listener 4 voices a question or opinion into the microphone MC4, the control unit 21 controls the volume according to the distance from the microphone MC4 to each of the speakers SP1 to SP6, in the same way as described above. The level pattern is read from the storage unit 22, and a volume control signal is sent to each attenuator ATT1 to ATT6. As a result, the volume from speakers SP2 and SP3 becomes lower,
The volume from speakers SP1 and SP6 is adjusted to be louder. Thereby, each listener 1-3, 5-7 can listen to the voice of the listener 4 who spoke at the optimal volume.

Note that when the calculation unit 23 provided in this embodiment receives a signal from the control unit 21 according to the volume of the audio input to each of the microphones MC1 to MC7,
The optimum volume value is calculated based on the signal. Then, a volume change signal is sent to the control section 21. Based on this volume change signal, the control unit 21 controls each attenuator ATT1 to AT.
Change the volume control signal to T6. As a result, even if the volumes of voices uttered by the speaker 1 and each of the listeners 2 to 7 vary in size, the volumes from each of the speakers SP1 to SP6 can be raised and lowered as a whole while being optimally adjusted as described above. be able to.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various effective modifications and applications can be made based on the technical idea of the present invention. .

[0018]

[Effects of the Invention] As explained above, according to the present invention,
By adjusting the volume of each speaker according to the distance from multiple microphones to multiple speakers, it is possible to prevent the phenomenon that the voice may be easier or harder to hear depending on the positional relationship between the speaker and the listener, or the volume may be incorrectly adjusted. Since it is possible to effectively prevent the occurrence of howling caused by such noise, it is possible to provide better presentations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a presentation system according to the present invention.

FIG. 2 is a diagram for explaining the contents of a volume level pattern stored in a storage unit.

[Explanation of symbols]

1 Speaker 2-7 Listener 21 Control section 22 Memory section 23 Arithmetic unit MC1~MC7 Microphone SP1~SP6 Speaker ATT1~ATT6 Attenuator

Claims (2)

[Claims] 1. A presentation system comprising a plurality of microphones disposed at predetermined positions and a plurality of speakers disposed at predetermined positions, wherein audio input to each of the microphones is outputted from each of the speakers, the presentation system comprising: a volume adjustment means for adjusting the volume of each speaker; a storage means for storing the volume level of each speaker according to the distance from each microphone to each speaker; and a microphone from among the microphones into which audio is input. a control means for controlling the volume adjustment means by referring to the storage means according to the presentation system. 2. The presentation system according to claim 1, further comprising calculation means for changing the control of the volume adjustment means by the control means in accordance with the volume of audio input to each of the microphones.