Modulator/demodulator using baseband filtering

Details Modulator/demodulator using baseband filtering Modulator/demodulator using baseband filtering

1995-12-21

1998-10-20

Pascal, Robert

Demodulators

Phase shift keying or quadrature amplitude demodulator

329357, 329361, 329363, 332103, 332115, 375321, 375324, 375261, 375270, 348726, 455 47, 455109, H03D 124, H04L 2738, H04L 2736, H03C 152

Patent

active

058252428

ABSTRACT:
A modulation and demodulation scheme for video signals may be used for HDTV signals using VSB-PAM, analog NTSC signals using VSB-AM and digital video signals using QAM. VSB-PAM modulation and demodulation may be performed using in-phase and quadrature baseband filters. By adjusting the filter taps, a single modulator structure may be used for QAM and VSB-PAM modulation. Similarly, a single demodulator structure may be used for QAM and VSB-PAM demodulation. This demodulator may also be used for VSB-AM modulation.

REFERENCES:
patent: 3887768 (1975-06-01), Forney, Jr. et al.
patent: 4123710 (1978-10-01), Stuart et al.
patent: 4253067 (1981-02-01), Caples et al.
patent: 4965536 (1990-10-01), Yoshida
patent: 5177455 (1993-01-01), Bennett
patent: 5477199 (1995-12-01), Montreuil

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