JP2005159446A - Directional acoustic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a directional acoustic system capable of making broadcasting to a limited area timely by using a super-directional loudspeaker. <P>SOLUTION: The directional acoustic system is provided with: a modulator for modulating an ultrasonic carrier by a sound signal; a plurality of radiators for generating an audible sound with directivity from the modulated ultrasonic signal; a plurality of human sensing sensors each configuring a set with each of the radiators to sense people resident in its own sensing area; and a sound signal source for outputting a sound signal of a corresponding channel in response to a sensing signal of the human sensing sensors, each of the sets is located at one position while the sets are directed in different directions, the audible area by a sound wave from one of the radiators and the sensing area of one of the human sensing sensors are formed overlapped with each other and the overlapped area is selected so as not to be in duplicate with areas of the other sets. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a directional acoustic system that performs guidance broadcasting using a combination of a super-directional speaker that emits audible sound in a directional direction and a human sensor.

  There is a voice guidance device that provides guidance by emitting voice from a speaker in a store, an exhibition hall, or a reception. In these guidance devices, human sensors are arranged, and when a person's approach is detected, a predetermined broadcast is performed (for example, refer to Patent Documents 1 and 2). In addition, there is a reception guidance processing device in which speakers and sensors are arranged at a plurality of locations in a guide route in a store, and a predetermined voice guidance is individually performed appropriately from corresponding speakers by detecting passing customers (for example, Patent Document 3). reference).

JP-A-8-98226 JP 2002-16993 A JP 2003-216765 A

  The voice guidance device linked with the conventional human sensor shown in Patent Documents 1 and 2 is provided with one human sensor for one speaker and broadcasts information from one voice source. The voice is amplified using a normal speaker. As described above, in the case of a normal speaker, there is a problem that the voice is diffused and the guidance broadcast reaches even an unnecessary person around. In addition, when considering using a plurality of these devices or constructing a system for performing different guidance broadcasts from one place to a plurality of directions using a device such as Patent Document 3, the sound from each speaker There is a problem that broadcast sound is mixed and difficult to hear. Furthermore, since the human sensor used in the past performs automatic broadcasting in conjunction with the distance position of the person standing in front, it cannot perform automatic broadcasting to a specific area according to the position of the person. There was also a problem like this.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a directional acoustic system that enables super-directional speakers to be broadcast in a timely and limited area. To do.

  A directional acoustic system according to the present invention includes a modulator that modulates an ultrasonic carrier with an input audio signal, a power amplifier that amplifies the modulated ultrasonic signal, and a finite ultrasonic wave from the amplified ultrasonic signal. A set of multiple radiators that generate audible sound with directivity by parametric action due to nonlinearity of amplitude sound waves, and a set of each of the multiple radiators, detects a person entering the own sensing area and outputs a detection signal An audio signal having a plurality of human sensors to output and a plurality of audio broadcasting channels corresponding to each set, and outputting the audio signals of the corresponding channels to the modulator in response to the detection signals of the human sensors Each set is arranged in one place in a different direction, and is formed so that the audible area from the sound wave from the radiator and the sensing area of the human sensor overlap. And the other set area is obtained so as to be set so as not to overlap.

  According to the present invention, there is an effect that the superdirective speaker is driven in conjunction with the human sensor, and automatic broadcasting by sound is enabled only in a limited area.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing the configuration of a directional acoustic system according to Embodiment 1 of the present invention, and FIG. 2 is an explanatory diagram showing the operation of the directional acoustic system.
In the figure, radiators 1 to 3 are super-directional speakers that obtain sound in the audible band by using parametric action due to nonlinearity of ultrasonic finite amplitude sound waves, that is, distortion components generated in the process of ultrasonic waves propagating through air. It is. Each radiator 1 to 3 constitutes a set with each of the human sensors 5 to 7, and each set of radiators and human sensors (1, 5, 2, 6, 3, and 7) is arranged in the horizontal direction of the cabinet 4. It is individually attached to each of a plurality of surfaces facing different angles. Accordingly, each of the human sensors 5 to 7 detects the person 22 in the direction in which the sound waves of the corresponding radiators 1 to 3 are emitted.

  The sensing areas 8 to 10 of the human sensors 5 to 7 are formed so as to overlap the audible areas of the radiators 1 to 3 (the range indicated by the broken line in FIG. 2, for example, 20 degrees). Therefore, when the human sensors 5 to 7 have a wide-angle detection width, a receiving port having a structure that gives directivity to the detection angle may be provided in order to set the detection areas 8 to 10. Further, in this case, each set of the radiator and the human sensor needs to be set so as not to overlap with an area of another adjacent set. The playback device 11 serving as an audio signal source has a plurality of channels having the contents of broadcast sounds (audio signals) A, B, and C corresponding to each set, and a detection signal from any one of the human sensors 5 to 7. Is output, an audio signal of the broadcast content of the corresponding channel is output in response to the detection signal. The modulators 12 to 14 modulate the ultrasonic carrier with the audio signal input from the playback device 11.

The power amplifier 15 amplifies the modulated ultrasonic signal and supplies it to the corresponding radiators 1 to 3. Thereby, the radiators 1 to 3 radiate sound waves to the corresponding areas 8 to 10. Since sound waves are transmitted in the form of a beam, broadcast sound is provided to people in a specific narrow audible area. At that time, if you enter outside of the audible area, you will not be able to hear the sound suddenly, so even if you send multiple broadcast sounds from radiators 1 to 3 at the same time, the sound will not be mixed and only those who need the broadcast sound. Can communicate accurately.
In addition, in the above description, radiators 1 to 3 are arranged on different surfaces of one cabinet 4, but instead, they are the same even if they are arranged in different directions at almost the same position.

  As described above, according to the first embodiment, a set of a radiator as a super-directional speaker and a human sensor are arranged in one place in different directions, and an audible area by sound waves from the radiator is provided. Is set so that the detection area of the human sensor overlaps with that of the other set areas, and the audio signal of the channel selected from the audio signal source in response to the detection signal of the human sensor is used. Based on this, broadcast sound is provided to the audible area where people have entered, so there is no unnecessary broadcast sound outside the audible area and no interference with broadcast sound in other areas. An effect is obtained in which different broadcast sounds can be automatically broadcast to different areas in conjunction with the sensor.

Embodiment 2. FIG.
FIG. 3 is a block diagram showing a configuration of a directional acoustic system according to Embodiment 2 of the present invention. In the first embodiment, the human sensors 5 to 7 are replaced with distance detection human sensors 16 to 18. The distance detection type human sensors 16 to 18 detect the distance between each sensor and a person 22 (see FIG. 2) passing therethrough, and output a detection signal corresponding to the distance. Moreover, the control part 21 is provided. In response to the detection signals from the distance detection type human sensors 16 to 18, a control signal corresponding to the distance is output to the playback device. In this case, it is assumed that three types of distance ranges between the sensor and the person are set, for example, d1, d2, and d3 (where d1 <d2 <d3). Then, the control unit 21 detects the distance range for each of the detection signals of the distance detection type human sensors 16 to 18 and obtains a control signal corresponding to any one of the three types. . On the other hand, the audio signal source 11 includes contents (A1, A2, A2) of a plurality of broadcast sounds (audio signals) corresponding to distance ranges (eg, d1, d2, d3) for each channel (eg, A) corresponding to each set. A3) is held. When a certain set of control signals is input, the audio signal source 11 outputs broadcast sound corresponding to the distance range indicated by the control signal on the corresponding channel.

  For example, when the detection signal of the distance detection type human sensor 16 indicates the distance range of d1, the broadcast sound A1 of the channel A is output by the control signal corresponding to the distance range, and the modulator 12 modulates the ultrasonic carrier To do. The modulated ultrasonic signal is amplified by the power amplifier 15 and given to the radiator 1 to drive it. The radiator 1 provides the broadcast sound A1 only to a person who is in its own audible area and within the distance range d1 from the distance detection type human sensor 16. When the broadcast sound A1 is being output, if a person moves from the distance range d1 to d2 or goes out of the current audible area, the current broadcast sound A1 is completely terminated. It may be set so that the control unit 21 does not output the next control signal or the reproduction apparatus 11 does not accept the next control signal.

  As described above, according to the second embodiment, each human sensor is configured with a distance detection human sensor that outputs a detection signal corresponding to the distance to the person, and each distance detection type is controlled by the control unit. Detects a preset distance range from the detection signal of the human sensor, gives a control signal corresponding to the detected distance range to the sound signal source, and outputs a sound signal corresponding to the distance range indicated by the control signal on the corresponding channel Thus, in addition to the effect of the first embodiment, an effect that broadcast sound having different contents according to the direction and distance where a person stands can be obtained.

Embodiment 3 FIG.
4 is a block diagram showing the configuration of a directional acoustic system according to Embodiment 3 of the present invention, and FIG. 5 is an explanatory diagram showing the operation of the directional acoustic system.
The third embodiment is configured such that guidance broadcasting is performed for one audible area with one set of the distance detection type human sensor 16 and the radiator 1. In this case, when a person 22 enters the audible area 8, a detection signal corresponding to the distance is output from the distance detection type human sensor 16. In the control unit 21, a preset distance range is detected from the detection signal, and a control signal corresponding to the detected distance range is output to the playback device (audio signal source) 11. The playback device 11 holds a plurality of broadcast sound contents A1, A2, and A3 corresponding to the distance range, and outputs an audio signal of the broadcast sound corresponding to the distance range indicated by the input control signal. In the modulator 12, the ultrasonic carrier is modulated with this audio signal. The modulated ultrasonic signal is amplified by the power amplifier 15 and given to the radiator 1 to drive it. The radiator 1 generates a sound wave with respect to the detected sensing area 8 and broadcasts guidance to the person 22 there.

  As described above, according to the third embodiment, one set of radiators and a distance detection type sensor are used, and the control unit detects a preset distance range from the detection signal of the distance detection type sensor, and detects it. The control signal corresponding to the distance range is output to the playback device (audio signal source), and the playback device has a plurality of broadcast contents corresponding to the distance range, and the audio of the broadcast content corresponding to the distance range indicated by the control signal Since the signal is output to the modulator, it is possible to obtain an effect of limiting the area where broadcasting is necessary and enabling guidance broadcasting with different contents depending on the distance in the area.

Embodiment 4 FIG.
FIG. 6 is a block diagram showing the configuration of a directional acoustic system according to Embodiment 4 of the present invention, and FIG. 7 is an explanatory diagram showing the operation of the directional acoustic system.
In the fourth embodiment, in addition to the distance detection type human sensor 16 described in the third embodiment, a voice recognition device 20 is combined. A microphone 19 and a voice recognition device 20 are newly provided for FIG.

In the figure, when a person 22 enters the audible area 8, a detection signal corresponding to the distance is output from the distance detection type human sensor 16. The control unit 21 detects a preset distance range from the detection signal, and outputs a control signal corresponding to the detected distance range to the playback device (audio signal source) 11. The playback device 11 outputs an audio signal of broadcast content (for example, A1) corresponding to the current distance range, and the radiator 1 starts broadcasting. When the broadcast is completed, when a person 22 makes a request by voice toward the microphone 19 installed in the cabinet 4 or in the vicinity thereof, the voice recognition device 20 recognizes the voice signal, and the recognition signal is controlled by the control unit. To 21. The control unit 21 receives the recognition signal that has been voice-recognized, analyzes the content thereof, and outputs a corresponding control signal to the playback device 11. The playback device 11 holds supplementary content (for example, a1, a2,...) As lower information of broadcast content (for example, A1) corresponding to the distance range, and the control signal corresponding to the input voice recognition is stored. In response, an audio signal with supplemental contents is output. Therefore, guidance broadcasting according to a request by voice can be performed for a person in a specific area.
In addition, when a person makes a request by voice, it is preferable to prepare an input sentence example of a requirement item with a signboard or the like in advance so that voice recognition processing can be easily performed.

  As described above, according to the fourth embodiment, the voice recognition device is provided, the voice input to the microphone is recognized, and the control unit outputs the control signal corresponding to the detected distance range to the recognition signal that has arrived. In response to this, the playback device (audio signal source) is controlled to output an audio signal corresponding to the input audio, so that in addition to the sensor function, interactive broadcasting and guidance broadcasting for inquiries and inquiries from humans are limited. The effect that makes possible for the area is obtained.

It is a block diagram which shows the directional sound system structure by Embodiment 1 of this invention. It is explanatory drawing which shows operation | movement of the directional acoustic system which concerns on the same Embodiment 1. FIG. It is a block diagram which shows the directional sound system structure by Embodiment 2 of this invention. It is a block diagram which shows the directional sound system structure by Embodiment 3 of this invention. It is explanatory drawing which shows operation | movement of the directional acoustic system which concerns on the same Embodiment 3. It is a block diagram which shows the directional sound system structure by Embodiment 4 of this invention. It is explanatory drawing which shows operation | movement of the directional acoustic system which concerns on the same Embodiment 4.

Explanation of symbols

  1 to 3 radiators, 4 cabinets, 5 to 7 human sensor, 8 to 10 sensing area, 11 playback device (audio signal source), 12 to 14 modulator, 15 power amplifier, 16 to 18 distance detection type human sensor , 19 Microphone, 20 Voice recognition device, 21 Control unit, 22 Human.

Claims (5)

A modulator that modulates an ultrasonic carrier according to an input audio signal;
A power amplifier for amplifying the modulated ultrasonic signal;
A plurality of radiators that generate audible sound with directivity from the amplified ultrasonic signal by parametric action by nonlinearity of ultrasonic finite amplitude sound waves;
A plurality of human sensors that constitute a set with each of the plurality of radiators, detect a person entering the self-sensing area, and output a detection signal;
An audio signal source having a plurality of audio broadcast channels corresponding to each set, and outputting an audio signal of the corresponding channel to the modulator in response to a detection signal of the human sensor;
Each set is arranged in one place in a different direction, formed so that the audible area by the sound wave from the radiator and the sensing area of the human sensor overlap, and do not overlap with the other sets of areas A directional sound system that is set up like this. Each human sensor is composed of a distance detection type human sensor that outputs a detection signal according to the distance to the person,
A control unit that detects a preset distance range from the detection signal of each distance detection type human sensor and provides a control signal corresponding to the detected distance range to the audio signal source,
The audio signal source has a plurality of audio signal contents corresponding to the distance range for each channel corresponding to each set, and corresponds to the distance range indicated by the control signal in the corresponding channel in response to the control signal. The directional acoustic system according to claim 1, wherein the voice signal is output. A multi-sided cabinet having a plurality of surfaces oriented at different angles in the horizontal direction,
The directional acoustic system according to claim 1, wherein each set is individually installed on each of the plurality of surfaces. A modulator that modulates an ultrasonic signal according to an input audio signal;
A power amplifier for amplifying the modulated ultrasonic signal;
A radiator that generates audible sound with directivity from the amplified ultrasonic signal by non-linear parametric action of ultrasonic finite amplitude sound waves;
A set with this radiator, forming a self-sensing area that overlaps the audible area by sound waves from the radiator, detecting a person entering the sensing area, and detecting a detection signal according to the distance to the person A distance detection type human sensor to output,
A control unit that detects a preset distance range from the detection signal and outputs a control signal according to the detected distance range;
A directional acoustic system comprising: an audio signal source having a plurality of audio signal contents corresponding to the distance range, and outputting an audio signal corresponding to the distance range indicated by the control signal to the modulator. A microphone included in the set of the radiator and the distance detection type human sensor, provided with a microphone arranged toward the audible area, and a voice recognition device that recognizes an input voice to the microphone and outputs a recognition signal to the control unit,
5. The control unit controls an audio signal source according to a recognition signal that arrives after outputting a control signal corresponding to the detected distance range, and outputs an audio signal corresponding to the input audio. The directional acoustic system described.

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