JP2005102032A - High presence sound listening apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high presence sound listening apparatus which enables high presence sound listening equivalent to a binaurally recorded sound source, in spite of using a sound source which is not recorded binaurally. <P>SOLUTION: The high presence sound listening apparats is equipped with a sound-source presentation section S, a sound collection section R, and a sound presentation section H. The presentation section S has a speaker 1 which is arranged in a sound-isolated case 2 and is positioned at an arbitrary position inside the case 2. The collection section R has a dummy head 3 which has a head part transfer function approximate to the head part transfer function of a listening person 10, is driven so as to follow up the movement of the head part of the listening person 10 synchronously, has microphones 4a, b at the positions of both ears, and is arranged similarly in the case 2. The presentation section H has a communication section 5 for transmitting acoustic signals obtained by collecting sounds reproduced and radiated from the speaker 1 with the microphones 4a, b arranged at the positions of both ears, and a headphone 6 to which the transmitted acoustic signals are entered to reproduce and output the sounds. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a highly realistic sound receiving apparatus, and more particularly, to a highly realistic sound receiving apparatus that can be heard with a high sense of presence equivalent to a binaurally recorded sound source using a sound source that is not binaurally recorded.

In a scene of information transmission with high personality such as a telephone, it is preferable to realize a listening environment using a listening device that is difficult to hear by others such as headphones. When constructing a highly realistic acoustic listening device using headphones, it is important to consider the personal acoustic characteristics derived from the listener's head shape, called the head-related transfer function, and the binaurally recorded sound source It is common to prepare and use this (see Non-Patent Document 1).
Toshiro Oga, Yoshio Yamazaki, Yutaka Kaneda, "Acoustic System and Digital Processing", IEICE, 1995.

  In the binaural recording / playback apparatus, binaural recording in consideration of the head-related transfer function unique to the listener needs to be performed in advance. It is difficult to process a sound source created by binaural recording that takes into account a particular individual's head-related transfer function into a sound source that can be used by another person. Further, in binaural recording using a commercially available dummy head having an average head shape, there is a problem of loss of realism due to insufficient personality of the head shape.

  In this invention, a dummy head having a head-related transfer function that approximates the listener's head-related transfer function is incorporated into a listening device, so that a sound source that is not binaurally recorded can be heard with a high sense of presence equivalent to that of a binaurally recorded sound source. The present invention provides a highly realistic sound receiving apparatus that can solve the above-described problems.

  Claim 1: A head that is arranged in a soundproof case 2 and has a sound source presentation unit S having a speaker 1 positioned at an arbitrary position in the case 2 and approximates the head-related transfer function of the listener 10 A sound collecting device having a transfer function, driven in synchronization with the head movement of the listener 10, microphones 4 a, b arranged at the positions of both ears, and a dummy head 3 arranged similarly in the case 2 A communication unit 5 for transmitting sound signals collected by the microphones 4a and b at the positions of both ears, and a sound to be reproduced by inputting the transmitted sound signals. A highly realistic sound listening apparatus including an acoustic presentation unit H having headphones 6 to be output was configured.

  According to a second aspect of the present invention, the sound source presentation unit S uses the speaker 1 as a movable speaker and further transmits an acoustic signal to the speaker 1. A speaker position control device 13 for controlling the position of the speaker 1, and a sound source position / motion recording device 12 for transmitting sound source position information and sound source motion information to the speaker position control device 13. Is composed of a movement sensor attached to the head of the listener 10 and a head movement measuring device 7 as main parts, and the sound collecting section R transmits information on the head movement measured by the head movement measuring section M. Thus, a highly realistic sound receiving apparatus having a dummy head control unit 8 and a dummy head driving unit 9 for driving the dummy head 3 was configured.

  According to the present invention, it is possible to configure a listening environment with a high sense of presence using a general sound source that is not binaurally recorded. This effect is linked to the movable speaker 1 that reproduces an acoustic signal that is not binaurally recorded, and the movement of the head of the listener 10, and has microphones 4a and b at the positions of both ears. A dummy head 3 simulating the shape of the part, a case 2 in which the movable speaker 1 and the dummy head 3 are installed, a head movement measuring device 7 for detecting the movement of the head of the listener 10, and the listener 10 This is composed of a dummy head control unit 8 for transmitting the movement of the head to the dummy head 3 and a headphone 6 to which an acoustic signal collected by the microphones 4a and 4b is given to the listener 10.

  In the present invention, a dummy head 3 having a head-related transfer function that approximates the head-related transfer function of the listener 10 is configured, and the dummy head 3 is driven in synchronization with the head movement of the listener 10. The microphones 4a and 4b are arranged at the positions of the ear canal entrances of both ears, and the collected sound signals are transmitted from the microphone 4 to the headphone 6 via the communication unit 5 and reproduced, thereby transmitting the head of the dummy head 3 to the head. Even when the functions are not completely equal, a highly realistic listening environment can be realized.

The best mode for carrying out the invention will be described with reference to the embodiment of FIG.
The sound source presentation unit S includes a speaker 1 that constitutes a sound source, an acoustic signal recording device 11 that transmits an acoustic signal to the speaker 1, a speaker position control device 13 that controls the position of the speaker 1, and a sound source for the speaker position control device 13. The sound source position / motion recording device 12 transmits position information and sound source motion information. In particular, a movable speaker is used as the speaker 1.

  The sound collecting unit R includes a dummy head 3, a microphone 4 attached to the ear of the dummy head 3, a case 2 that houses the dummy head 3 and the movable speaker 1, and a dummy head driving unit that drives the dummy head 3. 9 and a dummy head control unit 8 for controlling the dummy head drive unit 9.

  The head movement measuring unit M is configured with a head movement measuring device 7 that measures the movement of the head of the listener 10 as a main part.

  The sound presentation unit H includes a communication unit 5 that transmits an acoustic signal obtained by the microphone 4 of the sound collection unit R to the listener 10 and a headphone 6 that is attached to the listener 10 and presents the acoustic signal. ing. The communication unit 5 includes an audio cable, a wireless transmission path, an amplifier, and other members.

  The listener 10 can arbitrarily position the movable speaker 1 in the case 2. The relationship between the listener 10 and the position of the sound source presented to the listener 10 is equal to the relative positional relationship between the dummy head 3 and the movable speaker 1. Further, when the sound source position / motion information is recorded in the sound source position / motion recording device 12, the position of the movable speaker 1 is controlled by the speaker position control device 13 based on the recording of the sound source position / motion recording device 12. Thus, the sound field including the movement of the speaker 1 constituting the sound source can be reproduced in the case 2. Alternatively, the listener 10 can freely create sound source position / motion information and control the movable speaker 1 based on the created sound source position / motion information. As a result, the movement of the sound source that did not actually occur can be freely created and experienced.

  The movable speaker 1 reproduces an acoustic signal input from the acoustic signal recording device 11. The reproduced sound is collected by the microphone 4 attached to the entrance of the ear canal of the dummy head 3 installed in the case 2 subjected to the soundproofing process. The collected acoustic signal is transmitted to the headphone 6 attached to the listener 10 via the communication unit 5 including an audio cable, a wireless transmission path, and an amplifier, and the sound is transmitted via the headphone 6 to the listener 10. Presented to.

  The head movement measuring device 7 of the head movement measuring unit M measures the head position information of the listener 10 in real time. As the head movement measuring unit M, it is possible to measure the head movement information of the listener 10 in real time, and various devices can be employed. That is, the head movement measuring device 7 is included, and a magnetic sensor is attached as a movement sensor to the head of the listener 10 to magnetically measure head movement, or a light source and a reflector are provided on the head of the listener 10. The head movement is measured by attaching the sensor and measuring the reflected light. In addition, an ultrasonic sensor or a mechanical sensor is attached to the head to measure head movement. The dummy head drive unit 9 is controlled based on the head position information measured by the dummy head control unit 8, and as a result, the dummy head 3 follows the head movement of the listener 10 as shown by the arrows. Operate.

  Even when the head-related transfer function of the dummy head 3 is not completely equal to the head-related transfer function of the listener 10 because the dummy head 3 is driven in synchronization with the head movement of the listener 10, Listening environment can be realized. Here, the head movement measuring device 7, the dummy head control unit 8, and the dummy head driving unit 9 reduce the delay time from measuring the head position information of the listener 10 to driving the dummy head 3. It is preferable to design as much as possible.

  The drive sound generated by the dummy head drive unit 9 is attached to the dummy head 3 by surrounding the dummy head drive unit 9 with a soundproof material or by arranging the dummy head drive unit 9 outside the case 2. Transmission to the microphone 4 is prevented. Further, the case 2 is surrounded by a soundproofing material, and the inner surface of the case 2 is covered with a sound absorbing material such as urethane that does not cause echo inside.

  As described above, according to the present invention, the movable speaker 1 and the dummy head 3 of the sound collecting device S that reproduces an acoustic signal are disposed in a sealed state in the case 2. The position of the movable speaker 1 is controlled by the speaker position control device 13 based on the position / motion information supplied from the sound source position / motion recording device 12, and is input from the acoustic signal recording device 11 in the position-controlled state. Play the sound signal. The movable speaker 1 is arranged in consideration of the position of the sound source, and the relative positional relationship between the movable speaker 1 and the dummy head 3 matches the relative positional relationship between the sound source and the listener 10. Case 2 is soundproofed. The head-related transfer function of the dummy head 3 has a characteristic that approximates the head-related transfer function of the listener 10. Microphones 4 are inserted into both ears of the dummy head 3, and sound signals reproduced and radiated from the movable speaker 1 are collected at the position of the ear canal entrance. The collected acoustic signal is transmitted from the microphone 4 to the headphones 6 via the communication unit 5. The listener 10 listens to the sound reproduced and output from the headphones 6. On the other hand, the head movement of the listener 10 is measured in real time by the head movement measuring device 7. Information on the measured head movement is transmitted to the dummy head control unit 8, and the dummy head control unit 8 performs control to synchronize the movement of the dummy head 3 with the head movement of the listener 10. A control signal is transmitted from the dummy head controller 8 to the dummy head driver 9, and the dummy head 3 is driven by the dummy head driver 9. With these configurations, the listener 10 can obtain a high sense of presence.

The figure explaining an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker 2 Case 3 Dummy head 4 Microphone 5 Communication part 6 Headphone 7 Head movement measuring apparatus 8 Dummy head control part 9 Dummy head drive part 10 Listener 11 Acoustic signal recording apparatus 12 Sound source position / motion recording apparatus 13 Speaker position control apparatus

Claims (2)

A sound source presentation unit having a speaker disposed in a soundproof case and positioned at an arbitrary position in the case;
It has a head-related transfer function that approximates the listener's head-related transfer function, is driven in synchronization with the listener's head movement, and a microphone is placed at the position of both ears. It has a sound collection part with a dummy head,
A communication unit that transmits an acoustic signal obtained by collecting sounds reproduced and emitted from a speaker by microphones at positions of both ears, and an acoustic presentation unit that has headphones that reproduce and output the sound by inputting the transmitted acoustic signal. Have
A highly realistic sound listening device characterized by that. In the highly realistic sound listening apparatus according to claim 1,
The sound source presentation unit includes a speaker as a movable speaker, an acoustic signal recording device that transmits an acoustic signal to the speaker, a speaker position control device that controls the position of the speaker, and sound source position information and sound source motion in the speaker position control device. A sound source position / motion recording device for transmitting information;
The head movement measurement unit is composed of a movement sensor and a head movement measurement device attached to the listener's head.
The sound collection unit includes a dummy head control unit that transmits information on the head movement measured by the head movement measurement unit, and a dummy head drive unit that drives the dummy head.
A highly realistic sound listening device characterized by that.

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