Digital FM synthesizer for record circuitry

Details Digital FM synthesizer for record circuitry Digital FM synthesizer for record circuitry

1995-02-13

1996-10-15

Tse, Young T.

Pulse or digital communications

Pulse position, frequency, or spacing modulation

370 10, 332112, H03K 708

Patent

active

055662072

ABSTRACT:
A digital synthesizer for record circuitry of, e.g., a VCR, is supplied with digital samples representing a video signal. A calculator stage, responsive to the digital samples calculates a sequence of pulse periods defining a pulse duration modulated signal that represents FM modulation of a carrier by the video signal. An output sample generating stage operates on the sequence of pulse periods for generating a sequence of digital output samples which is converted in a digital-to-analog converter to the FM modulated video signal for subsequent recording on tape.

REFERENCES:
patent: 4051539 (1977-09-01), Geddes et al.
patent: 4181817 (1980-01-01), Gallo
patent: 4906942 (1990-03-01), Nakai et al.
patent: 4912524 (1990-03-01), Nakamura et al.
IEEE Transactions on Consumer Electronics, Digital Signal Processing in Video Tape Recorders, Sanke Mehrgardt, vol. CE-31, No. 3, Aug. 1985, pp. 374-377.
IEEE Transactions on Consummer Electronics, Experiments on VTR Digital Signal Processing, Kaoru Kobayashi, vol. CE-32, No. 3, Aug. 1986, pp. 355-361.

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