Electrical audio signal processing systems and devices – Noise or distortion suppression – Using signal channel and noise channel
Reexamination Certificate
2005-05-17
2005-05-17
Lee, Ping (Department: 2644)
Electrical audio signal processing systems and devices
Noise or distortion suppression
Using signal channel and noise channel
C379S406120
Reexamination Certificate
active
06895095
ABSTRACT:
A method of eliminating interference components in a microphone signal by generating a compensation signal and subtracting the compensation signal from the microphone signal. The compensation occurs completely in the frequency domain and the output signal is processed in the frequency domain as well. Measures for reducing the expenditure during the signal processing are specified. For example, advantageous modifications provide that a filter setting, obtained during a preceding speech pause, be used for eliminating interference in a voice signal and/or that the simulation filter be divided into several partial filters for long pulse responses. In particular, the invention is suitable for eliminating interference signal components, e.g., caused by a radio or the like, from a voice input signal in a motor vehicle, the source signal of which is available as reference signal.
REFERENCES:
patent: 5649012 (1997-07-01), Gupta et al.
patent: 5937060 (1999-08-01), Oh
patent: 6246760 (2001-06-01), Makino et al.
Daimler-Chrysler AG
Lee Ping
Voorhees Catherine M.
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