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.
CN101765041BActive Publication Date: 2015-08-05北京中星天视科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
北京中星天视科技有限公司
Publication Date
2015-08-05

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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.
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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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