Signal enhancement for voice coding

A signal processing system, comprising:

• a first converting device configured to output digital signals;
• an analysis device, said analysis device having both a feed forward and feedback signal path;
• a filtering device, said filtering device being operatively coupled to said first converting device and said analysis device;
• and
• a second converting device configured to output analog signals;
• wherein said analysis device includes an auditory mask estimator in the feedback signal path.

A signal processing system, comprising:

• a first converting device configured to output digital signals;
• an analysis device, said analysis device having both a feed forward and feedback signal path;
• a filtering device, said filtering device being operatively coupled to said first converting device and said analysis device;
• and
• a second converting device configured to output analog signals;
• wherein said analysis device includes an SNR estimator, a coherence mask, and a noise suppression filter estimator wherein said coherence mask is configured to receive and pass to said noise suppression filter estimator signals with a plurality of magnitudes from said SNR estimator.

A signal processing system, comprising:

• a first converting device configured to output digital signals;
• an analysis device, said analysis device having both a feed forward and feedback signal path;
• a filtering device, said filtering device being operatively coupled to said first convening device and said analysis device;
• and
• a second converting device configured to output analog signals;
• wherein said analysis device includes a normalized coherence estimator that is configured to receive said digital signals from said first converting device, said normalized coherence estimator being configured to identify predetermined components of said digital signals.

A signal processing system, comprising:

• a first converting device configured to output digital signals;
• an analysis device, said analysis device having both a feed forward and feedback signal path;
• a filtering device, said filtering device being operatively coupled to said first converting device and said analysis device;
• and
• a second converting device configured to output analog signals;
• wherein said analysis device includes a coherence mask, a normalized coherence estimator, and an noise suppression filter estimator, said noise suppression filter estimator being configured to convolve signals from the coherence mask and the normalized coherence estimator to compute a filtering coefficient that is output to said filtering device.

A signal processing system, comprising:

• a first converting device configured to output digital signals;
• an analysis device, said analysis device having both a feed forward and feedback signal path;
• a filtering device, said filtering device being operatively coupled to said first converting device and said analysis device;
• and
• a second converting device configured to output analog signals;
• wherein:
• said feed-forward signal path of said analysis device includes a signal-to-noise ratio (SNR) estimator, a coherence mask, and a normalized coherence estimator;
• said feedback signal path of said analysis device includes a auditory mask analyzer;
• and
• said feed-forward and said feedback signal paths are coupled through a noise suppression filter estimator such that said noise suppression filter estimator is configured to compute a noise suppression filter coefficient based on said digital signals from said feedback and feed-forward signal paths.

A method comprising the steps of:

• converting a time-domain analog signal to a frequency domain digital signal;
• filtering said digital signal and outputting a filtered signal;
• analyzing said digital signal in a feed-forward path of an analysis device and said filtered signal in a feedback path in said analysis device and outputting an analyzed signal based on said digital and filtered signals such that said filtering step is based on said analyzed signal;
• and
• converting said filtered signal into an time-domain analog signal.

An adaptive noise suppression system, comprising:

• means for converting time domain analog input signals to frequency domain digital signals;
• means for analyzing said digital signals such that said digital signals are coupled to said means for analyzing through a feed-forward and feedback signal path in said means for analyzing;
• means for filtering said digital signals coupled to said means for analyzing;
• and
• means for converting said digital signals to time domain analog output signals.