Color subcarrier regenerator for slow down processor

Claim 2

A color subcarrier regenerator for use in a video signal frame store of the type in which luminance and chrominance components of a composite video input signal are stored at one rate and recovered from the frame store at a lesser rate 1/N, N being an integer greater than unity, said regenerator comprising: first means responsive to the color burst component of said input video signal for producing a first conversion signal having a frequency equal to that of said color burst component; second means responsive to a fixed reference frequency signal for producing a second conversion signal having a frequency less than that of said first conversion signal by a factor (N-1)/N; third means for multiplying said conversion signals to form a product signal having sum and difference components; fourth means for applying said difference component of said product signal as a color subcarrier reference signal to a combining means in said frame store for forming a composite video output signal having a regenerated burst component; and fifth means for effectively adjusting the phase of said difference component of said product signal to a value such that said regenerated burst component exhibits a phase relative to the chrominance component of said video output signal substantially equal to the phase relationship between the chrominance and burst components of said composite video input signal.

Claim 3

A color subcarrier regenerator as recited in claim 1 wherein said second means includes divider means and further comprises means for presetting said divider means to a predetermined state on a periodic basis related to a parameter of said composite video intput signal.

Claim 4

A color subcarrier regenerator as recited in claim 2 further comprising means for producing said composite video signal, said means including a plurality of slow motion tape recorders and means for connecting a selected one of said recorders to an input of said frame store.

Claim 5

A color subcarrier regenerator as recited in claim 3 further comprising color encoder means and means for interposing said color encoder means in the connection of said selected tape recorder and said input of said frame store.

Claim 6

A color subcarrier regenerator as recited in claim 1 wherein said fifth means comprises a phase shift network interposed in any input-output path of said first, second, third or fourth means.

Claim 7

A color subcarrier regenerator for use in a video signal frame store of the type in which luminance and chrominance components of a composite video input signal are stored at one rate and recovered from the frame store at a lesser rate 1/N, N being an integer greater than unity, said regenerator comprising: burst locked oscillator means responsive to a color burst component of said composite video input signal for producing a first conversion signal; a reference signal source for producing a second conversion signal having a frequency equal to that of said first conversion signal, said conversion signals having a phase relationship therebetween which may vary for different sources of said input video signal; circuit means for reducing the frequency of said second conversion signal by a factor (N-1)/N; multiplier means responsive to the conversion signal of reduced frequency and to said first conversion signal for forming a product signal having a sum component and a different component; means for applying said difference component of said product signal as a color reference signal to a combining means in said frame store for forming a composite video output signal having a regenerated burst component; and means in said regenerator for setting the phase of said difference component of said product signal to a value such that said regenerated burst component exhibits a phase relationship relative to the chrominance component of said composite video output signal substantially equal to the phase relationship between the chrominance and burst components of said composite video input signal; whereby the input-output chrominance-burst phase relationship of said frame store is rendered substantially independent of the source of said video input signal.

Claim 8

A color subcarrier regenerator for use in a video signal frame store of the type in which luminance and chrominance components of a composite video input signal are stored at one rate and recovered from the frame store at a lesser rate 1/N, N being an integer greater than unity, said regenerator comprising: burst locked oscillator means responsive to a color burst component of said composite video input signal for producing a first conversion signal; a reference signal source for producing a second conversion signal having a frequency equal to that of said first conversion signal, said conversion signals having a phase relationship therebetween which may vary for different sources of said input video signal; circuit means for reducing the frequency of said second conversion signal by a factor (N-1)/N; multiplier means responsive to the conversion signal of reduced frequency and to said first conversion signal for forming a product signal having a sum component and a different component; means for applying said difference component of said product signal as a color reference signal to a combining means in said frame store for forming a composite video output signal having a regenerated burst component; and means in said regenerator for setting the phase of said difference component of said product signal to a value such that said regenerated burst component exhibits a phase relationship relative to the chrominance component of said composite video output signal substantially equal to the phase relationship between the chrominance and burst components of said composite video input signal; whereby the input-output chrominance-burst phase relationship of said frame store is rendered substantially independent of the source of said video input signal.