发明名称 |
DIGITAL PREMODULATION FILTER |
摘要 |
A programmable premodulation filter having a finite impulse response to digitally filter a digital data signal to provide a modulation signal for modulating an RF carrier signal is described. A digital summer and accumulator are programmed to provide a finite impulse response to a bimodal impulse signal which represents the input digital data signal. Several impulse response functions g(t) are stored in a ROM (or RAM) and may be selected to reprogram the digital filter to provide a desired modulation format. When a RAM is used, additional impulse response functions may be input to the RAM and the stored impulse response functions may be dynamically modified to provide the desired modulation format. |
申请公布号 |
CA1293778(C) |
申请公布日期 |
1991.12.31 |
申请号 |
CA19880569102 |
申请日期 |
1988.06.09 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
COLLISON, ROBERT R.;WENDE, MICHAEL T.;BIRGENHEIER, RAYMOND A. |
分类号 |
H03C3/00;H03H17/00;H03H17/02;H03H17/06;H04L27/12;H04L27/20 |
主分类号 |
H03C3/00 |
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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