Frequency-domain dual-channel speech enhancement algorithm for digital hearing aids
In the daily use of hearing aids,interference noise and desired speech mostly come from different directions,and the application of multi-channel enhancement algorithms in digital hearing aids can effectively reduce the impact of interference noise.The adaptive multi-channel enhancement algorithm enables dynamic adjustment of directional patterns in complex environments to improve the noise cancellation performance of hearing aids.A dual-channel enhancement system based on frequency-domain generalized sidelobe cancellation is designed,which improves the blocking matrix part and traditional adaptive part by using the correlation between the noise reference signal and the speech reference signal in the frequency domain,so as to prevent the blocking matrix from generating large speech leakage,and the weight factor is updated by selecting a smaller step in the speech segment and a larger step in the noise segment to retain the required speech and suppress the interference noise.In the simulation experiment,two objective evaluation indicators in a variety of interference environments are used to verify the effectiveness of the proposed algorithm.
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