Novel silencer and noise reduction method

A muffler device and a new type of technology, applied in the direction of sounding equipment, instruments, etc., can solve the problems of high cost, bulky, unfavorable popularization and application, and achieve the effect of low cost and easy realization.

Inactive Publication Date: 2010-06-23
李双清
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  • Application Information

AI Technical Summary

Problems solved by technology

Among the above-mentioned noise reduction devices and methods, the former type of noise reduction devices cannot selectively remove noise, and the scope of application has certain limitations; although the latter type of noise reduction devices can selectively remove some useless noises, they require external special The electromechanical or optical sensing device is bulky and expensive, which is not conducive to popularization and application

Method used

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  • Novel silencer and noise reduction method
  • Novel silencer and noise reduction method

Examples

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Embodiment 1

[0035] Embodiment 1, combining figure 1 and figure 2 , A new noise reduction device, including two microphones, a loudspeaker 1, a separation processor 2, a phase inversion and amplitude modulation processor and an audio codec 3. One of the microphones is the basic microphone 4, and the other is the error microphone 5. The error microphone 5 is installed near the speaker 1 to reduce the secondary path delay. The phase inversion and amplitude modulation processors include digital signals to analog signals. The converter and the automatic amplitude modulator, the separation processor 2 is a digital signal processor, and the digital signal processor is provided with a random access memory 21 , a flash memory 22 , an internal parameter adjustment interface 23 and a power supply 24 . The basic microphone 4 is sequentially connected to the first amplifier 41, the first automatic amplitude modulator 42 and the audio codec 3, the audio codec 3 is connected to the digital signal proc...

Embodiment 2

[0069] Example 2, combined with image 3 and Figure 4 , A new noise reduction device, including a microphone 4, a loudspeaker 1, a separation processor 2, a phase inversion and amplitude modulation processor and an audio codec 3. The microphone 4 is installed near the loudspeaker 1 to reduce the secondary path delay. The phase inversion and amplitude modulation processor includes a digital signal to analog signal converter and an automatic amplitude modulator. The separation processor 2 is a digital signal processor. The digital signal processor is provided with random access memory 21 , flash memory 22 , internal parameter adjustment interface 23 and power supply 24 . The microphone 4 is sequentially connected to the amplifier 5, the automatic amplitude modulator 6 and the audio codec 3, and the audio codec 3 is connected to the digital signal processor, and the digital signal processor is sequentially connected to the digital signal to the analog signal converter 7 and the...

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PUM

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Abstract

The invention discloses a novel silencer and a noise reduction method. The device is characterized by comprising a microphone, a loudspeaker, a separation processor or module and an phase reversal and amplitude modulation processor or module; and the microphone extracts a reference sound signal from the received jumbly sound by the separation processor or module, the reference sound signal is transmitted to the loudspeaker after phase reversal and amplitude modulation are carried out on the reference sound signal by the phase reversal and amplitude modulation processor or module and is output by the loudspeaker, and the specific site noise is counteracted. The method is characterized by comprising the following steps of: receiving the jumbly sound by using the microphone; separating the jumbly sound and extracting the reference sound signal; and after carrying out phase reversal and amplitude modulation on the reference sound signal, outputting the reference sound signal by the loudspeaker to counteract the specific site noise. The invention can realize selective elimination of the background noise without an additional special electromechanical or optical sensing device.

Description

technical field [0001] This group of inventions relates to a sound-absorbing device and a sound-absorbing method. The noise reduction device and the noise reduction method can selectively filter out useless noises, and are suitable for loud and noisy places. Background technique [0002] Most of the noise reduction devices and noise reduction methods in the prior art adopt active noise control technology. For example, the noise reduction device in it either directly inverts the signal received by the microphone to eliminate all background sounds (no matter whether it is noise or useful sound), such as the headsets that have been put into commercial use for people to listen to music in noisy environments; Either by using an electromechanical or optical sensing device to obtain a reference signal (signal to be eliminated), to selectively remove some unwanted noise, such as a noise cancellation device that can be used in a truck cab, the reference sound signal uses the engine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
Inventor 李双清
Owner 李双清
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