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1. 发明授权

US5715353A Sine-wave modulator and playback/recording modulator-demodulator for a high-fidelity video playback/recording system 失效
标题翻译：用于高保真视频播放/录制系统的正弦波调制器和播放/记录调制解调器
公开(公告)号：US5715353A
公开(公告)日：1998-02-03
申请号：US656443
申请日：1996-05-31
申请人： Chun-Sub Kim , Yong-Serk Kim
发明人： Chun-Sub Kim , Yong-Serk Kim
IPC分类号： H03B1/04 , H03C3/00 , H03D3/24 , H03K7/06 , H04N5/92 , H04N5/76 , G11B5/02 , G11B20/06
CPC分类号： H03C3/00 , H03K7/06 , H04N5/92 , H03B1/04 , H03D3/241
摘要： A playback/recording modulating-demodulating device, having a voltage-controlled oscillator (VCO), a voltage-current inverter (VCI), a band-pass filter, an amplitude limiter, and a phase-locked loop. In playback mode, the playback input signal is applied to the band-pass filter, the phase-locked loop is activated, and the VCI is set to produce a reference signal which controls the band-pass filter to tune the playback input signal. The tuned playback signal is applied to the amplitude limiter which produces an amplitude-limited signal which is applied to the phase-locked loop to produce a demodulated playback output signal. In record mode, the phase-locked loop is deactivated, the VCO produces a signal having a frequency which varies according to the voltage of a record input signal, and the VCI outputs a current control signal, having an output current related to the voltage of the record input signal, which is applied to the band-pass filter to control its bandwidth. A signal having a frequency value determined by the voltage of the record input signal is output by the VCO and applied to the band-pass filter, which outputs a record output signal. Thus, in the record mode, the bandwidth of the band-pass filter is related to the frequency of the signal which it filters.
摘要翻译：具有压控振荡器（VCO），电压 - 电流逆变器（VCI），带通滤波器，限幅器和锁相环的重放/记录调制解调装置。在回放模式中，重放输入信号被施加到带通滤波器，锁相环被激活，并且VCI被设置为产生控制带通滤波器的参考信号来调谐播放输入信号。调谐回放信号被施加到幅度限制器，其产生施加到锁相环的振幅限制信号以产生解调的重放输出信号。在记录模式下，锁相环被去激活，VCO产生具有根据记录输入信号的电压而变化的频率的信号，并且VCI输出电流控制信号，该电流控制信号具有与记录输入信号，其被施加到带通滤波器以控制其带宽。具有由记录输入信号的电压确定的频率值的信号由VCO输出并施加到输出记录输出信号的带通滤波器。因此，在记录模式中，带通滤波器的带宽与其滤波的信号的频率有关。

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