Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Reexamination Certificate
2006-02-28
2006-02-28
Urban, Edward F. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
C455S337000, C455S312000, C329S315000, C329S336000
Reexamination Certificate
active
07006806
ABSTRACT:
Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator for demodulating the SAP signal using the phase shifted SAP signal and a delayed SAP signal, and a lowpass filter to eliminate noise from the FM demodulated SAP signal. The system may also include an automatic gain control for normalizing amplitude of FM demodulator input signals. The digital FM demodulator uses a simplified approximation using non-unity delay for simplified demodulation of frequency modulated signals.
REFERENCES:
patent: 4486897 (1984-12-01), Nagai
patent: 4506228 (1985-03-01), Kammeyer
patent: 4628539 (1986-12-01), Selwa
patent: 4716589 (1987-12-01), Matsui
patent: 4803700 (1989-02-01), Dewey et al.
patent: 4862099 (1989-08-01), Nakai et al.
patent: 5151926 (1992-09-01), Chennakeshu et al.
patent: 5404405 (1995-04-01), Collier et al.
patent: 5440269 (1995-08-01), Hwang
patent: 5614862 (1997-03-01), Sun
patent: 6356598 (2002-03-01), Wang
patent: 6476878 (2002-11-01), Lafay et al.
patent: 6611571 (2003-08-01), Nakajima
patent: 2000004122 (2000-01-01), None
patent: 2001197398 (2000-07-01), None
Lambert Russ
Wu David Chaohua
Broadcom Corporation
Chow Charles
McAndrews Held & Malloy Ltd.
Urban Edward F.
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