Acoustic echo cancellation tuning method, system and storage medium based on Android device
An echo cancellation, Android technology, applied in speech analysis, transducer acoustic response prevention, instruments, etc., can solve the problems of not being able to guarantee single-talk, double-talk effect at the same time, sacrificing double-talk effect, and adjusting too low, etc. The effect of echo cancellation effect, good single and double talk effect
Active Publication Date: 2022-04-15
RINGSLINK XIAMEN NETWORK COMM TECH
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Problems solved by technology
Based on the unavoidable factors such as the disturbance caused by the delay jitter that cannot be equal to 0, the nonlinear echo bottom sound caused by structural problems, and the noise on the microphone path, the parameters of the NLP nonlinear filtering algorithm cannot obtain a balanced value. Simple nonlinear filtering Adjustment of the parameters, a slight increase will lead to poor dual-talk effect, but if the adjustment is too low, due to the influence of background noise, nonlinear factors, and delay jitter, the perception of echo is obvious
Since there are no suitable parameters, only the effect of single-speak echo cancellation can be guaranteed first, and the effect of dual-speak is sacrificed, and the effect of single-speak and dual-speak cannot be guaranteed at the same time, and the user experience is greatly limited.
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[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is some embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present invention, all other implement...
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The present invention relates to the technical field of echo cancellation, specifically an acoustic echo cancellation tuning method, system and storage medium based on an Android device. The source code of the Android HAL layer of the method can be modified, which includes: 1) The source code of the Android audio system HAL layer is directly called TINYALSA interface, open up two threads to read the microphone audio data and write the speaker audio data; 2) Calculate the energy mean value of the specified time period according to the output time domain signal, and judge the energy mean value and the preset threshold value: if it is lower than the threshold value During the time period, it is judged to be in the remote single-talk state, and the AGC is turned off; for the time period higher than the threshold, it is judged to be in the double-talk state, and the AGC is turned on; at the same time, the NLP filter parameters are dynamically adjusted according to the judged intercom state; in order to achieve a good single-talk double talk effect.
Description
technical field [0001] The invention relates to the technical field of echo cancellation, in particular to an acoustic echo cancellation tuning method, system and storage medium based on an Android device. Background technique [0002] At present, the hands-free mode echo cancellation based on the AudioRecord / AudioTrack interface data of the Java layer on the Android device has the problem of large data delay and jitter at the speaker end (far end) / microphone end (near end). Based on this limitation, even if the excellent frequency-domain NLMS (normalized minimum mean square error) filtering algorithm and NLP (non-linear filtering) algorithm based on power spectral density cross-correlation included in the WEBRTC open source framework are used, the values of the algorithm parameters are constantly adjusted. , can not achieve a good echo cancellation effect. The main reason is that most of the current solutions borrow the excellent AEC / AGC algorithm of WEBRTC, but implem...
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IPC IPC(8): G10L21/0208H04R3/02
CPCH04R3/02G10L21/0208G10L2021/02082
Inventor刘鲤扬林昱黄志超
OwnerRINGSLINK XIAMEN NETWORK COMM TECH