Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1992-09-02
1994-12-20
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
With control signal
455211, 455308, 333 14, 375102, H04B 116
Patent
active
053752554
ABSTRACT:
A radio receiver for an RF signal which is phase or frequency modulated by an information signal. The receiver has an analog receiving section which provides non-linear dynamic compression. The resulting analog signal is sampled and the samples are digitized by an A/D converter. The non-linear dynamic compression reduces the necessary number of quantizing steps in the A/D converter, which is less expensive, but thereby introduces non-linear distortion. To compensate such distortion, in the digital processing section of the receiver an expansion section is provided which processes the digital signal samples in accordance with the inverse of the non-linear dynamic compression characteristic. The resulting expanded digital sample values equalize the analog non-linear dynamic compression. The information signal is recovered from the expanded digital signals.
REFERENCES:
patent: 4282578 (1981-08-01), Payne et al.
patent: 4553105 (1985-11-01), Sasaki
patent: 4631489 (1986-12-01), Laird et al.
patent: 4726042 (1988-02-01), Vance
Baier Alfred
Heinrich Gerd
Eason Leroy
Eisenzopf Reinhard J.
Pham Chi
U.S. Philips Corporation
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