JP2013042420A - Three-dimensional sound transceiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional sound transceiver for localization of sound images including depth feeling or depth perception by movement of a sound source.SOLUTION: A three-dimensional sound transceiver comprises a transmitter and a receiver. The transmitter has: a modulation section for multiplexing and modulating a signal input from a sound field microphone section composed of a plurality of right and left microphones; and a signal transmission section for transmitting the signal modulated by the modulation section. The receiver has: a demodulation section for demodulating the modulated signal; a calculation section for calculating a moving direction of a sound source from differences of sound pressure in arbitrary time change; a distance measurement section for measuring a distance from a listener; a speaker section composed of a plurality of speakers; and a sound wave deflection section for making sound output from the speaker section reflect, by being controlled based on the calculation result by the distance measurement section.

Description

The present invention relates to a transmission and reception device for transmitting a three-dimensional sound at a relay station in FM radio or television sound, and for a listener to receive the broadcast.

2. Description of the Related Art Conventionally, a technique for controlling and using localization of a sound image by processing a digital signal of a sound source with the aim of reproducing a good sound image has been used.
As such a sound image localization control technique, a sound image localization filter coefficient that simulates a head related transfer function (HRTF) measured by a dummy head having two microphones on the left and right sides for each sound image localization position, and a digital sound source waveform signal A method based on a convolution operation using a filter is known (for example, Patent Document 1).

JP 2000-23299 A

  However, conventional acoustic systems, especially systems related to the surround system, are intended to give viewers a three-dimensional expansion of sound, but the localization of sound images due to movement of the sound source such as the depth and perspective of the sound source It was not enough to satisfy the audience.

  Therefore, an object of the present invention is to provide a three-dimensional sound transmission / reception apparatus that also supports localization of a sound image by movement of a sound source such as a sense of depth or perspective of the sound source.

  That is, the three-dimensional sound transmission / reception apparatus according to the present invention transmits a signal modulated from a sound field microphone unit composed of a plurality of microphones on the left and right sides in a multiplexed manner, and a signal modulated by the modulation unit. A transmitter having a signal transmitter, a demodulator that demodulates a modulated signal, a calculator that calculates a moving direction of a sound source from a difference in sound pressure over an arbitrary time change, and a distance from a listener A receiving device having a distance measuring unit, a speaker unit including a plurality of speakers, and a sound wave deflecting unit that is controlled based on a calculation result by the distance measuring unit and reflects sound output from the speaker unit. A three-dimensional sound transmission / reception device.

  And the said sound field microphone part is said three-dimensional sound transmission / reception apparatus comprised by the right and left three microphones each having directivity.

  And the said sound wave deflection | deviation part is said 3D sound transmitter-receiver independent of the said receiver.

According to the three-dimensional sound transmission / reception apparatus according to the present invention, even if one or more performers move back and forth and right and left on the stage of a theater and emit sound, the direction of the movement The sound image can be localized and a sound image full of presence can be created as if the viewer is actually in the theater.

It is a block diagram which shows the structural example of the three-dimensional sound transmission / reception apparatus which concerns on this invention. It is the schematic which shows the positional relationship of a receiver, a sound wave deflection | deviation part, and a hearing person. It is a circuit block diagram which shows the path | route of the process of the calculating part which exists in a receiving part.

  Hereinafter, an embodiment relating to a three-dimensional sound transmitting / receiving apparatus according to the present invention will be described in detail with reference to FIGS. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms.

  FIG. 1 is a block diagram showing a configuration example of a three-dimensional sound transmitting / receiving apparatus according to the present invention. The transmission device (1) can be connected to a sound field microphone unit (11) including three microphones (111) on the left and right sides, and includes an audio input unit (12), a detection unit (13), and a modulation unit. (14) A signal transmission unit (15) and a transmission-side antenna unit (16) are provided. The receiving device (2) includes a receiving antenna unit (21), a receiving unit (22), a demodulating unit (23), a detecting unit (24), a demultiplexing unit (25), a calculating unit (26), and output control. A unit (27), a speaker (28), and a distance measuring unit (29). Further, the calculation unit (26) includes a data input unit (261), a sound level detection circuit (262), a movement amount detection circuit (263), a matrix circuit (264), an encoding circuit (265), and a deflection information recording unit (266). ) And a data output unit (267).

  The microphone (111) collects sounds emitted from the sound source and converts them into electrical signals. By using a plurality of microphones (111), the microphones (111) can be arranged in an arc shape in the vertical direction or the horizontal direction, so that sounds spreading radially from the sound source can be collected. The microphone (111) can be a microphone having directivity. For example, a microphone having a single directivity with high sensitivity to the front of the microphone. By using the microphone having this directivity, it is possible to more clearly capture the sound emitted from the sound source on the stage or the like. Furthermore, in FIG. 1, each microphone (111) is connected to the transmission device (1) by wire, but may transmit an electric signal to the transmission device (1) wirelessly.

  As shown in FIG. 1, the voice input unit (12) is a part that inputs sound from the sound field microphone unit (11) to the transmission device (1). An analog / digital converter may be incorporated in the voice input unit (12). The detection unit (13) incorporates a circuit that detects an electric signal of the input sound with high sensitivity. The modulation unit (14) oscillates the frequency of the sound signals detected by the detection unit (13) collected by the microphones (111) and performs FM multiplexing. The signal transmission unit (15) is a part that performs control for transmitting the electric signal FM-multiplexed by the modulation unit (14) to the reception device (2). When an analog / digital converter is incorporated in the voice input unit (12), a digital / analog converter is provided in the signal transmission unit (15). A transmission antenna (16) is a part for transmitting the electric signal from a signal transmission part (15) to a receiver (2).

On the other hand, the receiving antenna (21) is a part for receiving radio waves emitted from the transmitting antenna (16). The receiving unit (22) receives the signal from the receiving antenna (21), amplifies it, and converts it into a digital signal. The demodulator (23) demodulates the multiplexed signal. A detection part (24) is a part which detects the gain of the demodulated signal and further reduces noise. The demultiplexing unit (25) is a part that separates the signal from each microphone (111) into three signals on the left and right.
The calculation unit (26) calculates the moving direction of the sound source from the digitally converted electrical signal. That is, the moving direction of the sound source is calculated from the sound pressure difference obtained from the left and right sound field microphone units (11) obtained by reception at a predetermined time interval and the moving speed of the sound source obtained by considering the Doppler effect from the change in frequency. To do.

  More specifically, the calculation unit (26) includes a data input unit (261), a sound level detection circuit (262), a movement amount detection circuit (263), a matrix circuit (264), an encoding circuit (265), deflection information. It has a recording unit (266) and a data output unit (267).

  As shown in FIG. 3, the data input unit is a part for inputting the electrical signal sent from the demultiplexing unit (25). The sound level detection circuit (262) is a sound pressure difference from the left and right sound field microphone units (11) obtained by reception at a predetermined time interval, for example, a sound pressure P1 at an arbitrary time T1, and a predetermined time after that. The sound pressure difference with the sound pressure P2 at time T2 and the sound pressure difference between the left and right sound field microphone units (11) are detected and sent to the matrix circuit (262), and information on the frequencies corresponding to those sound pressures is sent. It is sent to the movement amount detection circuit (263). Based on the frequency information sent from the sound level detection circuit (262), the movement amount detection circuit (263) detects the movement amount of the sound source that proceeds at an arbitrary time interval from the relational expression of the Doppler effect and the like. Information is sent to the matrix circuit (264). The matrix circuit (264) is connected to the sound level detection circuit (262) and the movement amount detection circuit (263), and the sound pressure difference information input from the sound level detection circuit (262) and the movement amount detection circuit (263). ) And a movement operation of the sound source is calculated by performing a logical operation such as a logical operation by negation after performing a logical operation by logical product or negative logical product. The encoding circuit (265) is a circuit that is connected to the matrix circuit (264) and encodes information on the moving direction of the sound source input from the matrix circuit (6) into an address signal. The deflection information recording unit (266) is a recording element that is connected to the encoding circuit (265) and stores information on the moving direction of the sound source at various times at arbitrary addresses. The encoding circuit (265) The address corresponding to the converted address signal is included. The data output unit (267) is connected to the deflection information recording unit (266), and has a function of handing over the encoded information regarding the moving direction of the sound source stored in the deflection information recording unit (266) to the drive control unit (31). Have.

  As shown in FIG. 1, the output control unit (27) generates a three-dimensional sound corresponding to the sound source, its moving direction and distance, changes the sound digital signal into the format of the speaker (28), and amplifies it. The speaker (28) outputs sound and is incorporated in the receiving device (2). The speaker (28) may be connected by wire or wirelessly and may be incorporated in a housing separate from the receiving device (2). The distance measuring unit (29) is a part that measures the distance to the listener (A) using a sensor such as an infrared sensor or an ultrasonic sensor. In addition, when the speaker (28) is incorporated in a housing separate from the receiving device (2), it is preferable that the distance measuring unit (29) is incorporated in the housing.

  As shown in FIGS. 1 and 2, the sound wave deflecting unit (3) includes a drive control unit (31) and a sound wave deflecting plate (32), and physically reflects the sound output from the speaker (28). It is a part to be made. In FIG. 2, the sound wave deflecting unit (3) is shown as a separate body from the receiving device (2), but may be incorporated in the receiving device (2). The drive control unit (31) is information about the moving direction of the sound source obtained by calculation by the calculation unit (26), information about the distance from the listener (A) measured by the distance measurement unit (29), And based on the information about the sound produced | generated by the output control part (27), the deflection angle of the sound wave deflection | deviation plate (32) is controlled so that the movement of a sound source may be reproduced. The sound wave deflecting plate (32) is a flat plate member that reflects the sound output from the speaker (28), and can be rotated in the horizontal direction. Further, the sound wave deflecting plate (32) may be designed to rotate in the vertical direction, and in that case, the sound image can be localized in the vertical direction.

  Next, the operation of the three-dimensional sound transmitting / receiving apparatus of the present invention will be described. First, the electrical signal of the sound collected by the sound field microphone unit (11) is sent to the voice input unit (12) of the transmission device (1). The signal input to the voice input unit (12) is detected with high sensitivity by the detection unit (13), and is oscillated by the modulation unit (14) in accordance with the frequency of each microphone (111). Multiplexed. And the signal is sent to a signal transmission part (15), and an electromagnetic wave is transmitted from a transmission antenna (16).

  On the other hand, the radio wave transmitted from the transmission antenna (16) is received by the reception antenna (21), and is amplified and digitally converted by the reception unit (22). The digitally converted signal is demodulated by the demodulator (23), passes through the detector (24), and is separated from the microphone (111) by the demultiplexer (25). Separated into signals. Then, based on the separated signal, the movement direction information of the sound source obtained by the calculation unit (26), the distance information with the listener (A) obtained by the distance measurement unit (29), and output control Based on the acoustic information generated by the unit (27), the sound output from the speaker (28) is transmitted to the auditor (A) corresponding to the movement of the sound source by the sound wave deflecting unit (3).

  The above acoustic transmitter / receiver can provide a powerful three-dimensional sound to the listener (A) as if, for example, the voice of a singer on the stage, which is a sound source, is listening to the venue. Can taste the live feeling.

DESCRIPTION OF SYMBOLS 1 ... Transmitter 11 ... Sound field microphone part 111, Microphone 12, Voice input part 13, Detection part 14, Modulation part 15, Signal transmission part 16, Transmission antenna 2 ... Reception apparatus 21・ Reception antenna 22 ・ Reception unit 23 ・ Demodulation unit 24 ・ Detection unit 25 ・ Demultiplexing unit 26 ・ Calculation unit 261 ・ Data input unit 262 ・ Sound level detection circuit 263 ・ Movement detection circuit 264 ・ Matrix Circuit 265, encoding circuit 266, deflection information recording unit 267, data output circuit 27, output control unit 28, speaker 29, distance measuring unit 3, sound wave deflecting unit 31, sound wave deflecting plate A, auditory sense Person

Claims (3)

A transmission device comprising: a modulation unit that modulates a signal input from a sound field microphone unit composed of a plurality of microphones each on the left and right; and a signal transmission unit that transmits a signal modulated by the modulation unit;
It consists of a demodulator that demodulates the modulated signal, an arithmetic unit that calculates the moving direction of the sound source from the difference in sound pressure over an arbitrary time change, a distance measurement unit that measures the distance from the listener, and a plurality of speakers A receiving device including a speaker unit and a sound wave deflecting unit that is controlled based on a calculation result by the distance measuring unit and reflects sound output from the speaker unit;
A three-dimensional sound transmission / reception device. The three-dimensional sound transmission / reception apparatus according to claim 1, wherein the sound field microphone unit includes right and left microphones each having directivity. The three-dimensional acoustic transmission / reception apparatus according to claim 1, wherein the sound wave deflection unit is independent of the reception apparatus.

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