Electrical audio signal processing systems and devices – Noise or distortion suppression – Spectral adjustment
Patent
1996-12-13
1999-12-21
Lee, Ping
Electrical audio signal processing systems and devices
Noise or distortion suppression
Spectral adjustment
381107, 381 56, H04B 1500
Patent
active
060059532
ABSTRACT:
In a new circuit arrangement for improving the signal-to-noise ratio, the entire audible frequency spectrum is divided into several abutting frequency channels. Each channel supplies the respective signal part in delayed form to an amplifier with controllable amplification. The amplifier's amplification is adjusted as a function of a comparator, so that when the audio frequency signal is below a threshold value during a specified time, the amplification of the controllable amplifier is gradually decreased to the lowest amplification value. Vice versa, when the useful signal again exceeds the threshold value, the amplification is gradually controlled upward to a maximum value.
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European Patent Office Search Report dated Jan. 7, 1999 corresponding to EP 96 11 9341.
Lee Ping
Nokia Technology GmbH
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