A Noise Reduction Method Based on Dual Microphones
A noise reduction and microphone technology, applied in the field of communication, can solve problems such as interference with voice content, easy distortion of voice, and large noise, and achieve the effects of ensuring real-time performance, short time consumption, and low algorithm complexity
Active Publication Date: 2021-03-02
SHENZHEN GRANDSTREAM NETWORKS TECH +1
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Problems solved by technology
It lacks real-time tracking of noise and speech. In the case of high noise suppression, the speech is easy to be distorted. When the speech quality is good, the noise is large and interferes with the speech content, resulting in unclear speech.
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[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention.
[0025] The basic principle of the invention is: adopting the combination of spectral subtraction and self-adaptive denoising to achieve the denoising effect on the VoIP terminal. According to the signals collected by the two microphones, the predicted noise power spectrum and the predicted signal power spectrum are obtained, and an adaptive filter is designed according to the signal, and the t...
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The present invention provides a dual microphone-based noise reduction method, comprising: step a: the first channel collects a first speech signal containing noise from the first microphone, and the second channel collects a second speech signal containing noise from the second microphone, And after the first speech signal and the second speech signal are sampled, carry out sub-frame processing respectively to obtain the first channel frame signal and the second channel frame signal; Step b: calculate the coherence coefficient modulus of the first channel frame signal and the second channel frame signal value; step c: calculate the frame signal power spectrum and predict the noise power spectrum respectively; step d: calculate the predicted signal power spectrum, and combine the predicted signal power spectrum and noise power spectrum to calculate the first channel frame signal and the second Each frequency line of the channel frame signal adjusts the gain, and finally realizes the adaptive filtering of the first channel frame signal and the second channel frame signal. The technical scheme of the invention improves the accuracy of prediction and has a good suppression effect on background noise.
Description
technical field [0001] The invention belongs to the communication field, in particular to a dual-microphone noise reduction technology based on mobile communication equipment. Background technique [0002] In recent years, the emergence of VoIP technology has made the cost of voice calls lower and communication more convenient and fast. With the rapid development of voice communication technology, VoIP terminals are frequently used in our daily life and work communication. People's requirements for the quality of VoIP voice calls are getting higher and higher. While reducing noise as much as possible, the voice signal should restore the authenticity of the speaker's voice as much as possible. When VoIP terminals are used in some important work conferences, users have more stringent requirements for their noise reduction technology. It is necessary to control the noise out of the hearing range of the human ear as much as possible while ensuring the voice hearing experience, ...
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IPC IPC(8): G10L21/0264H04M1/19
Inventor 羊开云高可攀韩翀蛟徐晓峰李夏宾
Owner SHENZHEN GRANDSTREAM NETWORKS TECH