System and method for providing voice equalization
View Patent ↗Systems and methods for providing voice equalization are provided. In exemplary embodiments, acoustic signals are received from both a near-end and a far-end environment. A power spectrum estimate for the far-end signal and a noise estimate based on the near-end signal are determined. A voice equalization mask based on the power spectrum estimate of the far-end signal and the noise estimate based on the near-end signal is generated and applied to the far-end signal to obtain a modified signal. The modified signal may then be dynamically processed to obtain an enhanced audio signal. The enhanced audio signal is then output.
1. A method for providing voice equalization in an audio device, comprising:
determining a power spectrum estimate of a far-end signal received by the audio device;
determining a noise estimate based on a near-end signal received by the audio device;
generating a voice equalization mask based on the power spectrum estimate of the far-end signal and the noise estimate based on the near-end signal;
applying the voice equalization mask to the far-end signal to obtain a modified signal;
dynamically processing the modified signal to obtain an enhanced audio signal; and
outputting the enhanced audio signal.
2. The method of claim 1 wherein generating the voice equalization mask comprises generating a modification gain (G S ).
3. The method of claim 1 wherein generating the voice equalization mask comprises generating a global gain (G O ).
4. The method of claim 1 wherein generating the voice equalization mask comprises generating local gains (G N ).
5. The method of claim 1 wherein generating the voice equalization mask comprises combining a modification gain (G S ), a global gain (G O ), and local gains (G N ) to generate a final modification mask.
6. The method of claim 1 wherein dynamically processing the modified signal comprises generating a limit gain (G L ) that prevents signal peaks from exceeding a pre-defined value.
7. The method of claim 1 wherein dynamically processing the modified signal comprises generating a smoother gain (G P ) that smoothes a waveform to prevent quick energy changes.
8. The method of claim 1 wherein dynamically processing the modified signal comprises combining a limit gain (G L ) and a smoother gain (G P ) and interpolating a result to a predetermined sampling rate.
9. The method of claim 1 wherein determining the noise estimate comprises receiving a primary acoustic signal via a primary microphone and receiving a secondary acoustic signal via a secondary microphone and determining an inter-microphone level difference between the primary and secondary acoustic signals.
10. The method of claim 1 wherein generating the voice equalization mask comprises combining a modification gain (G S ), a global gain (G O ), and local gains (G N ) to maintain a constant signal-to-noise (SNR) target.