Pulse or digital communications – Transceivers – Modems
Patent
1995-11-07
1997-12-02
Chin, Wellington
Pulse or digital communications
Transceivers
Modems
375270, 375277, 455109, 455 84, 327555, H04B 168
Patent
active
056944195
ABSTRACT:
A common transceiver circuit for use as either a modulator or demodulator and that is implemented through a shared resource approach. This approach is particularly, though not exclusively, suited for vestigial sideband (VSB) signals. Specifically, a VSB transceiver circuit (700), through strategically located multiplexing stages, physically re-uses a complex vestigial Nyquist filter (610), a complex mixer (620) and an equalizer (785) during demodulation and modulation. The VSB transceiver also selects a particular configuration of a common complex Hilbert transform circuit (720) for use during either demodulation or modulation. In addition, the same equalizer selectively provides both channel equalization, during de-modulation, and (sin x)/x compensation, during modulation, through use of differing corresponding sets of tap coefficients.
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Draft Report, VSB Transmission System--Grand Alliance, Technical Details; Dec. 7, 1994.
Lane Frank Anton
Lawrence Koslov Joshua
Scarpa Carl G.
Chin Wellington
Corrielus Jean B.
Hitachi America Ltd.
Michaelson Peter L.
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