SSB modulation and demodulation apparatus
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United States of America Patent
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Feb 19, 1991
Grant Date -
N/A
app pub date -
Jun 6, 1990
filing date -
Jun 8, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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