Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2006-10-10
2006-10-10
Harper, V. Paul (Department: 2626)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S226000, C704S229000
Reexamination Certificate
active
07120579
ABSTRACT:
A method and device for boosting an input signal to overcome noise. Both the input signal, S(t), and an estimate of the noise, N(t), are bandpassed in adjacent pass bands to produce signal and noise subbands. Preferably, the input signal is delayed before being bandpassed. The power envelopes of the signal subbands are converted to signal masking functions, (70), that incorporate the phenomena of forward and backward masking. Signal masking functions whose amplitudes are below the amplitudes of their frequency neighbors are nulled. Similarly, noise subbands whose powers are below the powers of neighboring noise subbands are nulled. The surviving signal masking functions are compared to the corresponding surviving noise power envelopes to determine the degree to which the surviving signal subbands must be amplified, (78), to overcome the noise. The surviving signal subbands are so amplified and summed to provide the output signal, S′(t). Because of wide band masking, this processing by subbands is inhibited during the onset of incoming signal. Similarly, in a two-way communications device, this processing by subbands is inhibited while the user is speaking.
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Clear Audio Ltd.
Fenster & Co.
Harper V. Paul
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