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Noise reduction processing audio chip and earphone

An audio chip and noise reduction processing technology, applied in active noise control, earpiece/headphone accessories, earphones to reduce environmental noise, etc., can solve problems such as prone to errors

Pending Publication Date: 2021-06-08
昆山海菲曼科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the implementation of the above method is prone to errors when the main audio signal is

Method used

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  • Noise reduction processing audio chip and earphone
  • Noise reduction processing audio chip and earphone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides an audio chip 100 for noise reduction processing, please refer to figure 1 , comprising: an audio processing circuit 3 having a filter for processing an audio signal to generate a main audio signal with a first sampling frequency; an external microphone input terminal 1 for receiving an external microphone original signal indicating an ambient audio sound; ear The channel microphone input terminal 2 is used to receive the original signal of the ear canal microphone closer to or at the user's ear canal; The ear canal microphone signal; the processing circuit 5 is used to receive the external microphone signal and the ear canal microphone signal to generate an anti-noise signal; the output circuit 6 is used to receive the anti-noise signal and generate a final output signal.

[0025] Specifically, the output circuit 6 includes an interpolator for receiving the anti-noise signal and generating a sampled anti-noise signal with a first sampling frequ...

Embodiment 2

[0040] This embodiment provides an earphone, which has any one of the above-mentioned audio chips for noise reduction processing, and has the same performance, which will not be repeated here.

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PUM

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Abstract

The invention provides an audio chip for noise reduction processing and an earphone. The chip comprises an audio processing circuit having a filter for processing an audio signal to generate a main audio signal having a first sampling frequency; an outside microphone input for receiving an outside microphone original signal indicative of ambient audio sound; an ear canal microphone input end which is used for receiving an ear canal microphone original signal closer to or located in the ear canal of the user; an analog-to-digital converter which is used for converting the outer side microphone original signal into an outer side microphone signal and converting the ear canal microphone original signal into an ear canal microphone signal; a processing circuit which is used for receiving the outer side microphone signal and the ear canal microphone signal to generate an anti-noise signal; and an output circuit which is used for receiving the anti-noise signal and the main audio signal and generating a final output signal. According to the invention, targeted noise reduction processing can be realized based on different earphone use scenes, and the circuit is simple and good in compatibility.

Description

technical field [0001] The invention relates to the field of audio output equipment, in particular to an audio chip for noise reduction processing and an earphone. Background technique [0002] Headphone sound quality can be improved by using a microphone located outside the headphone housing to measure the ambient noise, and then using signal processing to generate an anti-noise signal that is combined into the headphone output to cancel out the ambient noise. The effectiveness of ambient noise cancellation can be determined and noise cancellation operation can be improved by knowing the speaker output from a measurement device at the speaker or in the ear canal. The ideal speaker output is the main audio signal, with the ambient noise at the speaker's location canceled by the noise canceling signal. To identify the remaining ambient noise by removing the main audio signal from the ear canal microphone signal, the filtered correct phase and amplitude of the main audio sign...

Claims

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Application Information

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IPC IPC(8): H04R1/10H04R1/08H04R3/00G10K11/178
CPCH04R1/1083H04R1/08H04R3/00G10K11/17853G10K11/17813H04R2201/10H04R2460/01G10K2210/1081
Inventor 边仿
Owner 昆山海菲曼科技集团股份有限公司