Pulse or digital communications – Repeaters – Testing
Patent
1986-06-10
1989-02-07
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
329 50, H03D 124
Patent
active
048037001
ABSTRACT:
An SSB signal demodulator comprising an analog bandpass filter for band-limiting such signal, an analog-to-digital converter 20 for digitizing the band-limited signal, and a pair of quadrature related decimating filters (28, 29) for deriving quadrature related decimated signals therefrom which are applied to a Hilbert transform pair (30, 31). The upper or lower sideband signal is obtained by taking the sum or difference of the outputs of the Hilbert transform pair, and the resulting digital signal is reconverted to an analog signal. By using a decimation factor which is an odd numbered integer greater than 1, the periodic transfer function of the demodulator has alternate passbands and stopbands. This relaxes the performance requirements of the analog filter and of the Hilbert transform pair, and greatly enhances the adjacent channel selectivity of the demodulator.
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Collier Christopher J.
Dewey Richard J.
Briody Thomas A.
Eason Leroy
Safourek Benedict V.
Telesz Jr. Andrew J.
U.S. Philips Corp.
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