Noise elimination system and method, intelligent control method and device, communication equipment

Abstract

The present invention discloses a noise canceling system and method, an smart control 1 method and device and a communication equipment. Said smart control method includes: when it is detected there is no voice signal output at a receiving end of a communication equipment, receiving an outside noise signal from a reference microphone away from ears and a detection signal from a monitoring microphone near ears; implementing performance analysis on said received outside noise signal and said detection signal to estimate a noise reduction performance curve after said feed-forward active noise cancellation; and regulating parameters of the control circuit in said feed-forward active noise cancellation according to said estimated noise reduction performance curve and the preset noise reduction performance curve to make a difference between said estimated noise reduction performance curve and said preset noise reduction performance curve within a preset range. With the present invention, it is possible to effectively enhance noise reduction stability of a communication equipment to avoid inconsistency in noise reduction performance resulted from difference in coupling with ears of the communication equipment in use.

Description

technical field [0001] The present invention relates to the technical field of noise cancellation at the receiving end of communication equipment, and more specifically, to a non-closed feedforward active noise cancellation system, a non-closed active noise cancellation method, and a non-closed feedforward active noise cancellation system. An intelligent control method and device in active noise cancellation, and a communication device with the aforementioned non-closed feedforward active noise cancellation system. Background technique [0002] The improvement of social informatization has enabled people to communicate and communicate anytime and anywhere. The wide application of various communication devices (mobile phones, Bluetooth headsets, stereo headsets, etc.) and technologies has greatly facilitated people's lives and improved work efficiency. However, a serious problem brought about by the development of society is the noise problem. Communication in a noisy enviro...

AI Technical Summary

Problems solved by technology

The method to solve this inconsistent noise reduction performance is currently mainly to use DSP (digital signal processing) for adaptive active noise cancellation, but there are two aspects when this technology is applied to communication devices such as mobile phones, non-enclosed Bluetooth, and stereo headphones. limitations

On the one hand, the feed-forward adaptive noise cancellation algorithm uses the FX-LMS algorithm, which requires the identification of the secondary channel G to obtain , the identification error of the secondary channel will directly affect the stability of the system. The secondary channel G itself will have great changes during the use of the above-mentioned non-closed communication system, so the stability of the algorithm is difficult to guarantee

On the other hand, for communication devices such as mobile phones, non-enclosed Bluetooth, and stereo headsets, due to the volume limitation of the communication devices themselves, the time delay of the acoustic channel P is very small. If DSP is used for adaptive noise cancellation, the system sampling rate The requirements are very high, and the system power consumption and noise reduction frequency band will be very limited

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