Method and apparatus for sound enhancement with envelopes of multiband-passed signals feeding comb filters
First Claim
1. A method for processing source sound for therein enhancing wanted sound with respect to unwanted sound, said method comprising the steps of:
- distributing said source sound over a plurality of bandpass filters in as many channels in parallel;
in each channel applying a respective filter means for preferentially filtering the wanted sound with respect to the unwanted sound in that channel'"'"'s frequency band;
aggregating output signals of said channels to an enhanced output sound, characterized by;
feeding each bandpass filter'"'"'s output to an envelope detecting means to feed that channel'"'"'s filter means;
feeding each respective filter means'"'"' output to an envelope modulating means to generate that channel'"'"'s output signal.
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Abstract
Sound is processed for therein enhancing wanted sound with respect to unwanted sound. The sound is distributed over a plurality of parallel pass bands. In each channel, possibly with excepting the lowest frequency channels, the envelope of the respective signals in that frequency band is detected. Next, the envelope, or in the lowest frequency channels, the signal itself is preferentially filtered for enhancing signals at the fundamental frequency of the wanted sound. Subsequently, as far as applicable, the signal filtered is modulated with the envelope found for the channel in question and all channel outputs are summed.
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Citations
13 Claims
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1. A method for processing source sound for therein enhancing wanted sound with respect to unwanted sound, said method comprising the steps of:
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distributing said source sound over a plurality of bandpass filters in as many channels in parallel; in each channel applying a respective filter means for preferentially filtering the wanted sound with respect to the unwanted sound in that channel'"'"'s frequency band; aggregating output signals of said channels to an enhanced output sound, characterized by; feeding each bandpass filter'"'"'s output to an envelope detecting means to feed that channel'"'"'s filter means; feeding each respective filter means'"'"' output to an envelope modulating means to generate that channel'"'"'s output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification