Sine-wave modulator and playback/recording modulator-demodulator

Details Sine-wave modulator and playback/recording modulator-demodulator Sine-wave modulator and playback/recording modulator-demodulator

1996-05-31

1998-02-03

Tran, Thai

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 26, 360 29, 360 30, H04N 576, H04N 592, G11B 502, G11B 2006

Patent

active

057153531

ABSTRACT:
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.

REFERENCES:
patent: 4459566 (1984-07-01), Lane
patent: 4595992 (1986-06-01), Drogin
patent: 4916411 (1990-04-01), Lymer

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