Method for noise reduction of a FM signal

Details Method for noise reduction of a FM signal Method for noise reduction of a FM signal

2008-04-22

2008-04-22

Woo, Stella L. (Department: 2614)

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

C381S013000

Reexamination Certificate

active

07362872

ABSTRACT:
A compander for noise reduction of a FM signal is described, wherein a group delay (τ) linked to the generation of the compressor gain (cc(t)) is equalised during generation of the multiplex signal (m(t)), and a group delay (τ) linked to the generation of the expander gain (ce(t)) is equalised during generation of the sum signal (us(t)) and the expanded difference signal (ue(t)). Alternatively or additionally the compressor gain and/or the expander gain is controlled by an auxiliary signal on the basis of a combination of sum signal and difference signal of the FM signal. Such companders avoid overmodulation in the transmitter.

REFERENCES:
patent: 4602381 (1986-07-01), Cugnini et al.
patent: 4672633 (1987-06-01), Claasen et al.
patent: 4752955 (1988-06-01), Torick
patent: 41 28 045 (1993-03-01), None
“Improving the Signal-to-Noise Ration and Coverage of FM Sterophonic Broadcasts”, J. Audio Enc. Soc., vol. 33, No. 12, New York, 1985 Dec. pp. 938-943.
“Linear Phase Compander for FM Broadcast”, Aug. 24, 2001, pp. 1-25.

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