JPS6212822A - Device for visualizing sound field - Google Patents

Abstract

PURPOSE:To visualize an optional sound field by using a detecting signal of a sound detector fixed in a sound field as a reference signal and detecting a phase difference with a detecting signal of a sound detector moving the sound field. CONSTITUTION:A prescribed frequency component is extracted from a sound detecting signal to be a reference signal for the phase and intensity of a sound field which is outputted from a fixed sound detector 1B through a filter 7B and inputted to a phase detector 3 as a reference signal. On the other hand, a prescribed frequency component is extracted from a detecting signal of a moving sound detector 1A through a filter 7A and inputted to the detector 3. The detector 3 detects the phase difference of the detecting signal outputted from the detector 1A through the filter 7A with the reference signal which is the detecting signal outputted from the detector 1B through the filter 7B and drives a light emitting element 4 on the basis of the detecting signal. Since the element 4 is driven so that its luminance is changed in accordance with the phase difference of the detecting signal from the detector 1A moving in the sound field with the reference signal outputted from the detector B fixed on the sound field, an optional sound field can be visualized independently of a sound generating source.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound field visualization device that can visualize not only sound fields in the air but also sound fields in water and solid bodies.

[Conventional technology]

Regarding the visualization of sound fields, see Mizuho, Sekiguchi, and Iida; 1. Research on sound wave control devices,” Proceedings of the Japan Society of Mechanical Engineers (0 editions),
VoJ49.4447.1982 (1984-11).

FIG. 2 is a schematic diagram showing the configuration of a conventional sound field visualization device. In FIG. 2, the output of a mobile sound wave detector 1 such as a microphone is sent to a phase detector 3 via an amplifier 2.

Further, the output of the oscillator 6 is sent to an acoustic transducer 5 such as a speaker and a phase detector 3, and the phase detector 3 detects the phase difference between the two signals, the output of the oscillator 6 and the output of the amplifier 2. It detects this and obtains an output proportional to it.

The light emitting element 4 is driven by the output of the phase detector 3, and the light emitting element 4 is fixed to the sonic wave detector 1.

Next, the operation will be explained. One of the signals output from the oscillator 6 is converted into a sound wave by the acoustic transducer 5. The other signal output from the oscillator 6 enters the phase detector 3 as a reference signal.

When moving the sound wave detector 1 within the sound field, the sound wave detector 1
Depending on the position of the acoustic wave detector 1, a phase shift occurs between the signal detected by the wave detector 1 and the reference signal that passes through the amplifier 2 and enters the phase detector.

If the phase difference between these two signals is detected by a phase detector, and the light emitting element 4 is activated when the signals are in the same phase, but not activated when the signals are in opposite phase, then the distance traveled corresponds to the wavelength of the sound wave. Accordingly, the light emitting element 4 will blink.

If the sound wave detector 1 is moved and the blinking state of the light emitting element 4 is photographed using an open camera, the wave front (in-phase front) of the sound wave in the sound field can be obtained, and the sound field can be visualized. can.

[Problem that the invention seeks to solve]

However, since the conventional sound field visualization device described above uses the signal of the oscillator 6 as the reference signal, it is clear that the sound field artificially created using the oscillator 6 and the acoustic transducer 5 or the source of the sound wave is clearly identified. The drawback was that it could not be applied to anything other than a sound field.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a sound field visualization device that aims to visualize any sound field regardless of the source of sound waves.

[Means for solving problems]

The sound wave visualization device of the present invention includes a fixed sound wave detector that is fixed in a sound field to detect sound waves and outputs reference signals of the phase and intensity in the sound field, and a mobile device that moves within the sound field to detect sound waves. a phase detector that detects the phase difference between the detection signal of the mobile sonic detector and a reference signal, and a phase detector that detects the phase difference between the detection signal of the mobile sonic detector and the reference signal, and a phase detector that detects the phase difference between the detection signal of the mobile sonic detector and the reference signal. It is equipped with a light emitting element whose brightness changes depending on the phase difference.

[For production]

This invention uses a detection signal of a fixed sound wave detector fixed in a sound field as a reference signal and detects a phase difference between the detection signal of a sound wave of a mobile sound wave detector moving in the sound field and a phase detector,
The luminance of the light emitting element fixed to the movable acoustic wave detector is driven to change according to this phase difference.

〔Example〕

Embodiments of the sound field visualization device of the present invention will be described below with reference to the drawings. FIG. 1 is a professional diagram showing the configuration of one embodiment. In FIG. 1, the same parts as in FIG. 2 are designated by the same reference numerals and will be explained.

IA in FIG. 1 is a mobile sonic detector that moves within a sound field, and IB is a fixed sonic detector. Sonic detector I
The output of A is introduced into one input terminal of the phase detector 3 through an amplifier 2A and a filter 7A.

Similarly, the output of the acoustic wave detector IB fixed in the sound field is introduced into the other input terminal of the phase detector 3 through the amplifier 2B and the filter 7B.

This phase detector 3 detects the phase difference between two input signals and drives the light emitting element 4.

The light emitting element 4 is fixed to the acoustic wave detector IA.

Next, the operation of the sound field visualization device of the present invention configured as described above will be explained. Fixed sound wave detector IB
After a sound wave detection signal serving as a reference signal for the phase and intensity in the sound field is amplified by an amplifier 2B, a predetermined frequency component is extracted by a filter 7B and inputted to the phase detector 3 as a reference signal.

On the other hand, the detection signal of the mobile sonic detector IA is amplified by two amplifiers, and then a predetermined frequency component is extracted by two filters and input to the phase detector 3.

This phase detector 3 uses the detection signal of the sonic detector IB outputted from the filter 7B as a reference signal, detects the phase difference between the detection signal of the sonic detector IA outputted from the filter 7A, and uses the detected signal. The oscillation element 4 is driven.

In this way, the brightness of the light emitting element 4 is determined by the phase difference between the detection signal of the sonic detector IB fixed in the sound field as a reference signal and the detection signal of the mobile sonic detector moving in the sound field. Since it is driven to change, any sound field can be visualized regardless of the source of the sound wave.

〔Effect of the invention〕

As described above, according to the sound field visualization device of the present invention,
Using the detection signal of the sonic detector fixed in the sound field as a reference signal, the phase detector detects the phase difference between the detection signal of the mobile sonic detector that moves in the sound field and fixes it on the mobile sonic detector. Since the light emitting element is driven, any sound field can be visualized regardless of the source of the sound wave.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of a sound field visualization device of the present invention, and FIG. 2 is a diagram showing the configuration of a conventional sound field visualization device. IA...Moving sound wave detector, IB...Fixed sound wave detector, 3...Phase detector, 4...Light emitting element. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] A fixed sound wave detector is fixed in a sound field to detect sound waves and outputs a reference signal of the phase and strength of the sound field in the sound field, and a mobile sound wave detector is moved in the sound field to detect sound waves. a phase detector that detects a phase difference between the detection signal of the mobile sonic detector and the reference signal; and a phase detector that is fixed to the mobile sonic detector and whose brightness is adjusted according to the phase difference detected by the phase detector. A sound field visualization device comprising a changing light emitting element.