Method and apparatus for generating a playback clock from a 2.5

Details Method and apparatus for generating a playback clock from a 2.5 Method and apparatus for generating a playback clock from a 2.5

1990-11-01

1992-03-17

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358310, 358330, H04N 979

Patent

active

050973479

ABSTRACT:
In a video cassette recorder (VCR) including a video signal processing system having a source of a reference signal having a first frequency of 2.517 MHz, a clock signal generating circuit comprises a first frequency multiplier circuit of a balanced modulator type, having an input coupled to the source of a reference signal and having an output for providing a signal including a component having a second frequency of twice the first frequency. A filter arrangement has an input coupled to the output of the first frequency multiplier circuit, has an output, and has a response characteristic peak substantially at the second frequency. A second frequency multiplier circuit of a balanced modulator type, has an input coupled to the output of the bandpass filter arrangement and has an output for providing a signal including a component having a third frequency of twice the second frequency.

REFERENCES:
patent: 4956719 (1990-09-01), Yamashita
patent: 4969033 (1990-11-01), Yamada et al.

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