发明名称 |
MODULATOR/DEMODULATOR USING BASEBAND FILTERING |
摘要 |
<p>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.</p> |
申请公布号 |
CA2144596(A1) |
申请公布日期 |
1995.10.06 |
申请号 |
CA19952144596 |
申请日期 |
1995.03.14 |
申请人 |
CABLE TELEVISION LABORATORIES, INC. |
发明人 |
PRODAN, RICHARD |
分类号 |
H03K7/02;H03K9/02;H04L27/00;H04L27/02;H04L27/38;H04N5/44;H04N5/455;H04N5/46;H04N7/24;(IPC1-7):H04L27/04;H04N7/015;H04L27/06;H04L27/34 |
主分类号 |
H03K7/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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