Frequency multiplexing circuit in optical video disc recorder

Details Frequency multiplexing circuit in optical video disc recorder Frequency multiplexing circuit in optical video disc recorder

1988-04-18

1990-04-17

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358343, 358340, G11B 700

Patent

active

049185390

ABSTRACT:
A frequency multiplexing circuit in an optical video disc recorder frequency-multiplexes a second signal comprising a digital sound signal on the low frequency band of a first signal comprising a frequency-modulated video signal to generate a recording signal. In addition, the recording signal is applied to a limiter to be limited. In this case, a noise component produced in a band of the second signal is extracted by using a Bessel filter and a subtractor and previously subtracted from the recording signal generated by frequency multiplexing. The recording signal including a negative noise component is applied to the limiter, so that harmonic noise and linear distortion noise essentially produced in an output of the limiter can be cancelled. Furthermore, a slice level of the limiter is suitably adjusted, so that asymmetrical noise in the output of the limiter can be also eliminated.

REFERENCES:
Nikkei Electronics, 1984, vol. 3, No. 12, pp. 112-116.
Publication entitled "New Transmission System of High-Quality Television", Yuichi Ninomiya, NHK (Japan Broadcasting Corp.).
Science and Technical Research Laboratories, Tokyo, Japan, 6/6/84, pp. 1-24.
"HDTV Broadcasting and Transmission System-Muse-", Ninomiya et al., NHK (Japan Broadcasting Corp.), Science and Technical Research Laboratories, Tokyo, Japan, pp. 4.1.1-4.1.31.

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