JPS63115077A - Visualizing device for sound - Google Patents

Abstract

PURPOSE:To visualize the position and level of a sound source in real time by computing the position of the sound source, etc., based on the output signal of a sound collecting microphone. CONSTITUTION:Sound collected by the sound collecting microphone 1 is converted into an electric signal, which is passed through an amplifier 2, digitized by an A/D converter 3, and inputted to a digital signal processor (DSP) 4. The DSP 4 filters and divides the digital signal into respective frequency components, and also processes phase differences among electric signals of respective microphone elements, the levels of the electric signals, etc., at a high speed. Then, signals of the phase differences, etc., are sent to an arithmetic processor 5A to compute the position of the sound source, the level of the sound, etc., thereby generating and outputting a video signal indicating the position of the sound source, the level of the sound, etc. A display device 6, therefore, displays the position of the sound source, the level of the sound, etc., in real time by using the video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound visualization device that determines the position of a sound source from sound input to a microphone and displays the position on a display device.

[Conventional technology]

FIG. 4 is a schematic diagram showing a conventional sound visualization device;
In the figure, 7 is a sound source, 8 is a microphone that converts the sound from the sound source 7 into an electrical signal, 2 is an amplifier that amplifies this electrical signal, 3 is an A/D converter that converts an analog signal into a digital signal, and 5 is an A/D converter that converts an analog signal into a digital signal. A processing unit records this signal, calculates the position of the sound source 7, etc., and produces a video signal indicating the calculated position, etc., and 6 is a display device that displays the position of the sound source 7, etc. using the video signal. . Note that Alt '-
AXY is the measurement point.

Next, the operation will be explained. The sound generated from sound source 7 is
First, it is converted into an electrical signal by the microphone 8 set at the position An, and this electrical signal is amplified by the amplifier 2 and input to the A/D converter 3. The electrical signal is then converted into a digital signal by the A/D converter 3, and this digital signal is temporarily stored in the arithmetic processing unit.

Next, move the microphone to the Au position and perform the same process as above. In this way, processing is performed one after another, and when it ends at Axy t, the arithmetic processing unit 5 performs the processing from AI1 to A
Extract the data up to XY, calculate the sound source type, 2 position, etc. from the data size, frequency, etc., output a video signal indicating the calculated sound source type, 9 positions, and display the type and position on the display device 6. Display the location etc.

[Problem that the invention seeks to solve]

Since conventional sound visualization devices are configured as described above, it is necessary to move the microphone to each measurement point, and for this reason, it is necessary to store and process digital signals in chronological order. Therefore, there is a problem that the processing time for determining the position of the sound source, etc. is slow, and as a result, real-time processing cannot be performed.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a sound visualization device that can visualize sound in real time without moving the microphone to each measurement point. shall be.

[Means for solving problems]

The sound visualization device according to the present invention includes a collective microphone that captures sound three-dimensionally, and an arithmetic processing device that calculates the position of a sound source, etc. based on the signal output from the collective microphone. [Function] In the visualization device of the present invention, the arithmetic processing device calculates the position of the sound source in real time based on the signal output from the collective microphone, and the arithmetic processing device further generates a video signal indicating the calculated position of the sound source. Since it is output, the sound can be visualized in real time.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a collective microphone that converts sound into electrical signals, and as shown in FIG. 2, this is composed of a large number of microphone elements 1a.

2 is an amplifier that amplifies the electrical signal output from the collective microphone 1, and 3 is an A/D converter that converts the analog signal, which is the electrical signal, into a digital signal. 4 is a DSP (digital signal processor) that filters the digital signal and calculates the phase difference between the electrical signals output from each microphone element 1a; 5A is a DSP;
6 is a microcomputer that calculates the position of the sound source from the phase difference etc. calculated by SP 4 and outputs a video signal indicating the calculated position etc.; 6 is a microcomputer 5;
This is a display device that displays the position of a sound source, etc. based on the video signal output from A. Note that the DSP 4 and the microcomputer 5A constitute an arithmetic processing unit.

Next, the operation of the above visualization device will be explained.

Sound captured by the collective microphone 1 is converted into an electrical signal, and this electrical signal is amplified to an appropriate level by the amplifier 2. The electrical signal is converted into a digital signal by an A/I converter 3 and input to a DSP 4.

This DSP 4 filters the input digital signal and classifies it into each frequency component, and also performs high-speed calculation processing on the phase difference of the electrical signal between each microphone element 18, the magnitude of the electrical signal, etc.

In this case, it is not necessary to perform the arithmetic processing over the entire area between the microphone elements 18, and it is sufficient to perform the arithmetic processing only on a portion thereof. D
The signals such as the phase difference calculated by the SP 4 are sent to the microcomputer 5A, and this microcomputer 5A performs high-speed calculations of the sound volume, sound source position, etc. from the input signals, and calculates the calculated sound source. Creates and outputs a video signal that indicates the position of the object, the loudness of the sound, etc. Therefore, the display device 6 displays the position of the sound source and the loudness of the sound in real time using the video signal.

In the above embodiment, the sound is displayed as a video, but if it is superimposed on a video signal captured by a television camera, the source of the sound can be directly identified as shown in FIG. You can also do it.

〔Effect of the invention〕

As described above, according to the present invention, the collective microphone and the arithmetic processing device that calculates the position of the sound source in real time based on the signal output from the collective microphone are provided. This has the effect of being able to be visualized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a sound visualization device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the array configuration of collective microphones, and FIG. 3 is an explanatory diagram showing sound visualization. , FIG. 4 is a block diagram showing the configuration of a conventional sound visualization device. l is collective microphone, 3 is AID converter, 4FiDS
P (computation processing unit fft), 5A is a microcomputer (computation processing unit), and 6 is a display device.

Claims (1)

[Claims] A collective microphone in which microphone elements that convert sound into electrical signals are arranged in a matrix, an A/D converter that converts analog signals that are electrical signals output from the collective microphone into digital signals, and this A/D converter. an arithmetic processing device that calculates the position of a sound source in real time based on a digital signal output from the device, and further outputs a video signal indicating the calculated position of the sound source, and a video signal output from the arithmetic processing device; A sound visualization device comprising: a display device that displays the position of a sound source, etc.