Modulator/demodulator using baseband filtering

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

H - Electricity

04

L

H04L 27/04 (2006.01) H04L 27/00 (2006.01) H04L 27/02 (2006.01) H04L 27/06 (2006.01) H04L 27/34 (2006.01) H04L 27/38 (2006.01) H04N 5/44 (2006.01) H04N 5/455 (2006.01) H04N 5/46 (2006.01) H04N 7/015 (2006.01) H04N 7/24 (2006.01)

Patent

CA 2144596

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.

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