Apparatus for reproducing color picture information

Claim 2

In apparatus for reproducing color picture information recorded on a record medium in a succession of informationbearing areas including areas carrying luminance picture information and different areas carrying color picture information in the form of superimposed records of a quadraturemodulated color carrier signal having a frequency which is a multiple of the line recording rate and a pilot signal having a frequency which is a sub-multiple of the color carrier frequency, the combination of: means for conveying said record medium past a scanning gate, flying spot scanner means operative to simultaneously scan the luminance and chrominance information-bearing areas of a given color picture as said medium is conveyed past said scanning gate, and to separately detect the modulation of the scanning beam produced by the information contained in said luminance and chrominance carrying areas to derive a first video signal containing said modulated color carrier signal and said pilot signal, and a second video signal containing said luminance picture information, and frequency translating means to which said first video signal is applied, said frequency translating means including filter means for separating said first video signal into its modulated color carrier, and pilot signal components, means for doubling the frequency of said pilot signal component, a local source of signal having a frequency which is a multiple of one-half of the aforesaid line recording rate, and means including at least one mixer circuit operative in response to the frequencydoubled pilot component and the signal from said local source to directly convert the modulated carrier portion of said first video signal to a second modulated color carrier signal having the frequency of the signal from said local source.

Claim 3

Apparatus according to claim 1 further including summing means for combining said second modulated color carrier signal and said second video signal, and means for delaying said luminance-containing signal relative to said second modulated color carrier signal by an amount to line up the luminance and chrominance components of a given picture.

Claim 4

Apparatus according to claim 1 further including means for multiplying said second modulated color carrier signal with a signal having twice the frequency of said second modulated color carrier signal, filter means connected to the output of said multiplying means for selecting the lower sideband multiplication product, a switch operable at one-half said line recording rate and having first and second input terminals to which said second modulated color carrier signal and the output signal from said filter means are respectively applied, said switch thereby being operative to deliver a third modulated color carrier signal in which the phase of a color component thereof is reversed every other line, and summing means for combining said third modulated color carrier signal and said second video signal.

Claim 5

In apparatus for reproducing color picture information recorded on a record medium in a succession of information-bearing areas including areas carrying luminance picture information and different areas carrying color picture information in the form of superimposed records of a color carrier signal having a frequency which is a multiple of the line recording rate and quadrature-modulated with color information components, and a pilot signal having a frequency which is a sub-multiple of the color carrier frequency and forming a closely-spaced series of parallel lines extending longitudinally of said different areas, the combination of: means for transporting the record medium through a scanning zone, flying spot scanner means operative to simultaneously scan the luminance and chrominance information-bearing areas of a given color picture in a direction generally normal to the line series as the medium is transported past said scanning zone and to separately detect the modulation of the scanning beam producEd by the information contained in said luminance and chrominance carrying areas to derive a first video signal containing said modulated color carrier signal and said pilot signal, and a second video signal containing said luminance picture information, and frequency translating means to which said first video signal is applied, said translating means including filter means operative to separate said first video signal into its modulated color carrier and pilot signal components, means for doubling the frequency of said pilot signal component, a local source of signal having a frequency which is a multiple of one-half of the aforesaid line recording rate, and means including at least one mixer circuit operative in response to the frequency-doubled pilot component of said first video signal and the signal from said local source directly to convert the modulated carrier portion of said first video signal to a second modulated color carrier signal having a frequency equal to the signal from said local source.

Claim 6

In apparatus for reproducing color picture information recorded on a record medium in a succession of information-bearing areas including areas carrying luminance picture information and different areas carrying color picture information in the form of superimposed records of a color carrier signal having a frequency which is a multiple of the line recording rate and quadrature-modulated with color information components, and a pilot signal having a frequency which is a sub-multiple of the color carrier frequency and forming a closely-spaced series of parallel lines extending longitudinally of said different areas, the combination of: means for transporting the record medium through a scanning zone, flying spot scanner means operative to simultaneously scan the luminance and chrominance information-bearing areas of a given color picture in a direction generally normal to the line series as the medium is transported past said scanning zone and to separately detect the modulation of the scanning beam producEd by the information contained in said luminance and chrominance carrying areas to derive a first video signal containing said modulated color carrier signal and said pilot signal, and a second video signal containing said luminance picture information, and frequency translating means to which said first video signal is applied, said translating means including filter means operative to separate said first video signal into its modulated color carrier and pilot signal components, means for doubling the frequency of said pilot signal component, a local source of signal having a frequency which is a multiple of one-half of the aforesaid line recording rate, and means including at least one mixer circuit operative in response to the frequency-doubled pilot component of said first video signal and the signal from said local source directly to convert the modulated carrier portion of said first video signal to a second modulated color carrier signal having a frequency equal to the signal from said local source.

Claim 7

Apparatus according to claim 4 wherein the frequency of the color carrier recorded on the record medium is 1.8 MHz., the frequency of said pilot signal is 0.9 MHz., and the frequency of the signal from said local source is 3.58 MHz..

Claim 8

Apparatus according to claim 5 wherein said frequency translating means further includes means for mixing the doubled pilot frequency signal with a 3.58 MHz. signal from said local source to produce sum and difference frequencies, filter means operative to select said sum frequency signal, means for mixing said selected sum frequency signal with said modulated color carrier signal to produce sum and difference frequencies, and filter means for selecting said difference frequency signals thereby to produce a color carrier signal having a frequency of 3.58 MHz. modulated in accordance with the modulation carrier on the record medium.

Claim 9

Apparatus according to claim 6, further including summing means for combining said 3.58 MHz. modulated color carrier signal and said second video signal, and means for delaying said second video signal relative to said second modulated color carrier signal by an amount to line up the luminance and chrominance components of a given picture.

Claim 10

Apparatus according to claim 5 wherein said frequency translating means further includes means for mixing said modulated color carrier component with a signal from said local source to produce sum and difference frequencies, filter means operative to select the sum frequencies from said first mixing means, second mixing means to which said frequency-doubled pilot signal and said sum frequency signal are applied, said second mixing means being operative to produce sum and difference frequencies, and filter means operative to pass signals having a passband corresponding generally to the band-width of said modulated color carrier signal and centered at said difference frequency thereby to produce a second color carrier signal having a center frequency corresponding to the frequency of said local source and modulated in accordance with the modulation recorded on said record medium.