Active noise control system and design method thereof

Abstract

The invention provides an active noise control system, which comprises an environmental noise acquisition device, a high-speed analog-to-digital conversion device, a playback audio receiving device, a signal processing device, a high-speed digital-to-analog conversion device, a power amplifying device and a telephone receiver, wherein the signal processing device is electrically connected with the high-speed analog-to-digital conversion device and the playback audio receiving device, and the telephone receiver is electrically connected onto the power amplifying device. The signal processing device comprises an environmental noise digital signal input end, a playback audio digital signal input end, an air noise signal filtering module, an antiphase filter module based on a secondary acoustic feedback channel, a playback audio gain control adjusting module, a frequency response compensating module based on a secondary channel, a coefficient storage module, a signal superposition module and a mixed audio digital signal output end, wherein the environmental noise digital signal input end is used for receiving noise digital signals of an air noise environment. Compared with the prior art, the active noise control system is more effective in noise elimination.

Description

【Technical field】 [0001] The invention relates to an active noise control system and a design method thereof, in particular to an active noise control system and a design method thereof used in the field of portable communication products such as mobile phones. 【Background technique】 [0002] With the development of wireless communication, there are more and more mobile phone users around the world. The requirements of users for mobile phones are not only satisfied with calls, but also to be able to provide high-quality call effects. Especially the current development of mobile multimedia technology, the mobile phone Call quality is even more important. [0003] Due to the existence of a large amount of environmental noise, the signal-to-noise ratio of receivers of communication equipment such as mobile phones is generally not high enough when playing voice. Especially in high-noise environments such as street cars, it is necessary to increase the volume to make local mobile...

AI Technical Summary

Problems solved by technology

This phenomenon is often ignored by other noise cancellation methods, resulting in reduced noise cancellation effects, instability and even failure

In addition, the noise reduction methods in the related art do not consider the impact of wind noise on the microphone

Wind noise is the misacquisition of the microphone caused by air turbulence near the microphone. It is not like the general environmental noise that will spread to the human ear. It is a harmful interference that affects the noise reduction effect

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