JPH01270489A - Space voice erasing device - Google Patents

Abstract

PURPOSE:To make provision of a wall for sound-proof and sound absorption unnecessary and to form a silence part with low cost in construction by cancelling the voice of a sound source with the voice from a speaker and forming a silence part. CONSTITUTION:A sound D from a sound source A is converted to an electric signal D' by a microphone 1, inputted to a voice adjusting part 2 and further, sent to a speaker driving part 3. The signal D' is calibrated in accordance with the frequency characteristic and phase characteristic of the microphone by the adjusting part 2 and sent to the driving part 3. An electric signal amplified by the driving part 3 is sent to a superdirectional speaker 4 and converted to a sound E by the speaker 4. The sound E is directed in the progress direction of the sound D from the sound source A, the sound volume is respectively equal, the phase is different by 180 deg., and therefore, the sound D is cancelled and a silence part C is formed at a sound field B. Thus, the silence part with an inexpensive construction cost is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spatial sound canceling device using acoustic equipment.

[Conventional technology]

Conventionally, when attempting to create a silent area in a sound field, a method has been used to attenuate the sound by providing a sound-insulating or sound-absorbing wall.

[Problem that the invention aims to solve]

When creating a silent part in a sound field using conventional curvature, sound, sound absorption, etc., it is necessary to install a wall in the sound field, so it is not possible to move freely between the silent part and the sound part. Also, if you try to create a completely silent part, you will have to use a fairly large-scale device and the cost will increase.The present invention, which erases only specific sounds, uses a microphone that inputs the sound from the sound source and converts it into an electrical signal (VC). , audio mini 1 that inputs the signal from the same microphone, amplifies it, and inverts the phase.
The present invention is characterized in that it is equipped with a 9 adjustment section, 1b' from the audio adjustment section, and a speaker that manually converts the air signal into sound and transmits it in the direction in which the sound from the sound source advances.

[For production]

In the above, the sound from the sound source is input to the microphone and converted into an electrical signal. The electrical signal is manually input to the audio adjustment section, amplified, phase inverted, and then input to the audio controller. Is it human power for +al speakers? The generated MU i low signal is converted into audio and transmitted in the direction of travel of the audio from the sound source.

The sound from the speaker has the same volume as the sound from the sound source, but has a phase difference of 180°, so that a silent portion is formed in the sound field.

As a result of the above, it is no longer necessary to provide walls for sound insulation or sound absorption as in conventional devices, and it is now possible to freely move between the sound parts and the sound parts, making it possible to easily form soundless parts with low construction costs.

〔Example〕

An embodiment of the invention is shown in FIGS. 1 and 2.

In the present embodiment shown in FIGS. 1 and 2, a microphone 1. Same mic.

An audio adjustment section 2 to which the phone 1 is connected by an electric wire. The audio adjustment section 2 includes a super-directional speaker connected via a speaker drive section 3 with an electric wire.

In the above, the sound from the sound iA is converted into an electric signal D' by the microphone 1, and is inputted to the sound adjustment section 2, and further sent to the speaker drive circuit.

As shown in FIG. 3Vζ, the TL electrical signal' is calibrated in accordance with the frequency characteristics and phase characteristics of the microphone, calibrated according to the frequency characteristics and phase characteristics of the speaker, and phase inverted in the audio adjustment section 2, as shown in FIG. The sound volume is then adjusted and sent to the speaker drive unit 3, where it is amplified. The electrical signal amplified by the speaker drive section 3 is sent to a superdirectional speaker 4, where it is converted into sound E. Since the speaker 4 is arranged facing the direction in which the sound from the sound source A travels as shown in FIG. As shown in Fig. 2(b), since the sounds A and O are equal and have a 180 degree difference in phase, the sounds are canceled and a sound field BK and a silent part C are formed.

As a result of the above, it is no longer necessary to provide walls for sound insulation or sound absorption as in conventional devices, and it is now possible to freely move between the sound parts and the sound parts, making it possible to easily form soundless parts with low construction costs.

Note that when there are multiple sound sources F and G as shown in Fig. 4, if the microphone 1 captures only the sound of the sound source F and generates sound from the speaker 4 as soon as the sound of the sound source F is erased, the sound of the sound source F is erased and the sound source You can also make it so that only the G sound is heard.

In addition, the time for microphone 1 to capture sound and the time for speaker 4 to
If there is a time difference between the sound source and the time when the sound is generated, it is sufficient to move only microphone 1 close to the sound source. However, if the sound source fluctuates constantly due to temperature, wind, etc. Provide a mechanism that allows fine adjustments depending on the situation.

〔Effect of the invention〕

The present invention includes a microphone that inputs audio from a sound source, an audio A adjustment section that amplifies and phase inverts the electrical signal from the microphone, and a speaker that converts the electrical signal from the audio adjustment section into audio and outputs it. As a result, the sound from the speaker cancels out the sound from the sound source and creates a silent area, eliminating the need to install walls for sound insulation or sound absorption as in conventional devices, and allowing free separation between the sound source and the sound area. It is now possible to easily create silent sections that can be moved back and forth, and construction costs are low.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the above embodiment, Fig. 3 is a block diagram of signal processing of the above embodiment, and Fig. 4 is an explanatory diagram of the above embodiment. FIG. 3 is an explanatory diagram of an example in which there are two sound sources.

Claims (1)

[Claims] A microphone that inputs audio from a sound source and converts it into an electrical signal, an audio adjustment section that inputs the electrical signal from the microphone, amplifies it, and inverts the phase, and an audio adjustment section that inputs the electrical signal from the audio adjustment section and converts it into audio. A spatial sound canceling device characterized by comprising a speaker that emits in the direction in which sound from a sound source travels.