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An audio playback device and method for adaptively adjusting the volume

A technology of self-adaptive adjustment and audio playback, applied in the direction of transducer acoustic response prevention, etc., can solve the problem of difficult to accurately obtain the size of environmental noise, achieve the best audio clarity, eliminate feedback, and reduce volatility.

Active Publication Date: 2015-08-05
杭州联汇科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly solves the technical problem in the prior art that it is difficult to accurately obtain the level of environmental noise, and provides an audio playback device and method for adaptively adjusting the volume that can filter out playback sounds and accurately obtain the level of environmental noise

Method used

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  • An audio playback device and method for adaptively adjusting the volume
  • An audio playback device and method for adaptively adjusting the volume
  • An audio playback device and method for adaptively adjusting the volume

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Embodiment

[0046] Embodiment: an audio playback device for adaptively adjusting the volume of this embodiment, such as figure 1 As shown, it includes a processor module 101 , an audio interface module 105 , a power amplification module 106 , a speaker 107 , a noise detection module 109 , an analog audio module 104 and a wireless network module 103 . Audio interface module 105 connects processor module 101, power amplifier module 106, noise detection module 109 and analog audio module 104 simultaneously, the signal that noise detection module 109 detects is delivered to processor module 101, and the playback of processor module 101 is simultaneously The signal is passed to the power amplification module 106 . The power amplifying module 106 amplifies the playback signal and then plays it through the speaker 107 . The processor module 101 includes a USB interface and an SD card interface. The sound source of playing sound can be the audio file that is stored in the U disk or SD card 102 ...

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Abstract

The invention discloses a volume adaptive control audio playing equipment and method. The delay of a back-feed sound is estimated through the cross-correlation algorithm, the delay of a decoding audio signal is taken as a reference input for adaptive processing, and a sound signal detected by a noise detecting module is taken as a signal input for adaptive processing. The adaptive processing adopts an FIR (finite impulse response) filter and the NLMS (normalized least mean squares) adaptive filtering algorithm. Through adaptive processing, the normally played back-feed sound is inhibited, the real noise signal can be extracted from a noise sensor, and the playing volume of the playing equipment can be regulated after performing weighted moving average for the noise level. The volume adaptive control audio playing equipment and method disclosed by the invention are suitable for occasions with violent environmental noise variation.

Description

technical field [0001] The invention relates to an environmental noise detection technology and an adaptive gain adjustment technology for suppressing playback sounds in audio playback devices, in particular to a feedback that can suppress or eliminate playback sounds in a noise sensor, and adaptively adjust according to the size of the environmental noise An audio playing device and method of volume level. Background technique [0002] If the audio signal is played in an environment where the environmental noise changes drastically, there will be a mismatch between the energy of the environmental noise and the normal playback sound, resulting in auditory fatigue and unclear hearing. If the ambient noise is too loud and the signal-to-noise ratio is too low, listeners will have to prick their ears to hear clearly, causing auditory fatigue; if the ambient noise is low, excessive playback will damage the ears. [0003] One of the key technologies to achieve automatic gain cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/02
Inventor 赵凡祁才君
Owner 杭州联汇科技股份有限公司
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