Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-02-21
1997-05-27
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375324, 370206, 370480, H04L 2706, H03D 100
Patent
active
056338961
ABSTRACT:
The invention provides a method and apparatus for demodulating a composite AM DAB waveform which contains digitally modulated carriers and which employ (1) a mixer for converting a received signal into two signals (the first of these two signals represents an in-phase component and the second of these two signals represents a quadrature component); (2) two analog-to-digital converters for converting the two signals into digital signals; and (3) two fast Fourier transform elements for extracting data separately from the two digital signals. Complementary digital carrier signals are recovered from the quadrature component, and non-complementary digital carriers are derived from a sum of the complementary data and the output of the in-phase component FFT process. Leakage of the AM signal through a highpass filter is prevented from interfering with the demodulation of the complementary carrier signals' use of separated demodulation channels.
REFERENCES:
patent: 5278826 (1994-01-01), Murphy et al.
patent: 5499271 (1996-03-01), Plenge et al.
Carlin Barry W.
Dapper Mark J.
Geile Michael J.
Chin Stephen
Phan Hai H.
USA Digital Radio Partners, L.P.
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