Audio playback device and method for reducing ambient noise during audio playback

A technology for environmental noise and audio playback, applied in transducer circuits, sensors, electrical components, etc., can solve the problems of reduced portability, bulky and separate headphones, and achieve the effect of increasing experience and reducing environmental noise.

Active Publication Date: 2015-08-05
北京中星天视科技有限公司
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The disadvantage of the existing technology is that it needs to use the microphone installed on the earphone to pick up the ambient noise and provide a separate power supply for the noise reduction circuit
If the battery is integrated on the earphone, the volume of the earphone will be relatively large; if the battery and the noise reduction circuit are placed separately, the added wire will reduce the portability of the earphone

Method used

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  • Audio playback device and method for reducing ambient noise during audio playback
  • Audio playback device and method for reducing ambient noise during audio playback
  • Audio playback device and method for reducing ambient noise during audio playback

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Embodiment Construction

[0032] In order to solve the problem of earphone portability and improve the user's listening experience, the embodiment of the present invention integrates the noise reduction function into the audio playback device, and through noise collection and processing, the user can use ordinary earphones to enjoy the high-decibel noise. Quiet music listening environment.

[0033] refer to figure 2 , the audio playback device of the embodiment of the present invention includes: a microphone unit 10 , an inverting unit 20 , a first variable gain amplifier 30 , a playback unit 40 , a second variable gain amplifier 50 , an adding unit 60 and a power amplifier 70 .

[0034] The microphone unit 10 collects ambient noise signals, and outputs the collected ambient noise signals to the inverting unit 20 . The phase inversion unit 20 carries out phase inversion processing to the environmental noise signal collected, produces the anti-noise signal, and outputs the anti-noise signal to the fir...

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Abstract

The invention provides audio-frequency playing equipment and a method for reducing environmental noises generated during audio-frequency playing, wherein the method comprises the following steps of: collecting environmental noise signals; inverting the collected environmental noise signals to generate inverse noise signals; amplifying the inverse noise signals; playing back an audio-frequency signal source to generate audio-frequency signals and amplifying the audio-frequency signals; adding the amplified audio-frequency signals with the amplified inverse noise signals to generate sum signals; and outputting the sum signals to earphones and then counteracting the environmental noises by utilizing the inverse noise signals in the sum signals. The method can achieve favorable effect of noise reduction under the premise of not affecting the portability of the earphones.

Description

technical field [0001] The invention relates to noise processing during audio playback, in particular to an audio playback device and a method for reducing environmental noise during audio playback. Background technique [0002] figure 1 The existing audio signal playing process is shown. refer to figure 1 , the playback unit plays back the audio signal source to generate an audio signal, the audio signal is output to the earphone after being amplified by the variable gain amplifier and power amplified by the power amplifier, and the audio signal is played by the earphone. Due to the existence of environmental noise, what the user hears is a mixed signal of the audio played by the earphone and the environmental noise. The environmental noise interferes with the user's listening to the normal audio signal, thus affecting the user's experience. [0003] The processing of environmental noise in the prior art is as follows: a noise reduction circuit is provided in the earphon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 张宁
Owner 北京中星天视科技有限公司
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