发明名称 VOD reception with demodulation and quantization held during carrier switching to produce a video signal before the carrier switching
摘要 Supplied with carrier and channel selection signals in a VOD receiver from a remote control data processor from a remote control switch, a switching control circuit produces demodulation and equalization control signals substantially concurrently with carrier switching started by the carrier selection signal. In response, a demodulator and a digital transversal equalizer are held in a held state. Immediately after completion of the carrier switching, the demodulator and the equalizer are turned back to an automatically controlled state to be operable with synchronism kept. While demodulation and equalization are held, a digital signal processor produces a receiver output video signal for standstill picture scenes. Immediately upon turn back of the demodulation and the equalization, the channel selection signal makes the output video signal represent moving picture scenes. The digital transversal equalizer may be an analog one connected to the demodulator.
申请公布号 US5719641(A) 申请公布日期 1998.02.17
申请号 US19950546172 申请日期 1995.10.20
申请人 NEC CORPORATION 发明人 MIZOGUCHI, SHOICHI
分类号 H04N5/14;H04B3/06;H04L27/38;H04N5/00;H04N5/21;H04N5/44;H04N5/50;H04N7/26;(IPC1-7):H04N5/21 主分类号 H04N5/14
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