SSB modulation and demodulation apparatus

Details SSB modulation and demodulation apparatus SSB modulation and demodulation apparatus

1990-06-06

1991-02-19

Pascal, Robert J.

Modulators

Amplitude modulator

Single or vestigial sideband type

375 61, H03C 152

Patent

active

049947699

ABSTRACT:
In an SSB modulation/demodulation apparatus having a band-pass filter having a plurality of switchable bandwidths for restricting a signal transmission bandwidth, and a Hilbert converter constructed of a network having a pass band over all frequency ranges, the Hilbert converter is a digital Hilbert converter arranged to be set with switchable Hilbert conversion coefficients. The apparatus includes a Hilbert conversion characteristics changeover information memory for storing a plurality of Hilbert conversion coefficients corresponding to a plurality of Hilbert conversion coefficients for different bandwidths and different sideband suppressions; and a Hilbert conversion characteristics changeover unit responsive to a change in the bandwidth of the band-pass filter for reading corresponding ones of the Hilbert conversion coefficients from the Hilbert conversion characteristics changeover information memory, and supplying the read-out Hilbert conversion coefficients to the digital Hilbert converter means to change the Hilbert conversion coefficients previously set.

REFERENCES:
patent: 4510467 (1985-04-01), Chang et al.
patent: 4835791 (1989-05-01), Daoud

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