Video signal encoded with additional detail information

Claim 2

In a system for processing a television-type signal, apparatus for processing high frequency video information comprising: means for providing an input image representative video signal having a frequency spectrum including a high frequency band containing information to be encoded, and a lower frequency band; means for folding said frequency spectrum of said input video signal around a prescribed folding frequency in said lower frequency band to provide a folded video signal; means for combining said input video signal and said folded video signal to produce a combined video signal; and means for low pass filtering said combined video signal to provide a filtered signal, said low pass filtering means having a cut-off frequency corresponding to said folding frequency.

Claim 3

A system according to claim 1, wherein said low pass filtering means exhibits and amplitude attenuation characteristic that is substantially anti-symmetrical with respect to said folding frequency.

Claim 4

A system according to claim 1, wherein said input video signal is a wideband video signal; and said combined video signal is subject to being conveyed via a transmission channel including bandwidth restricting means whereby an output signal from said transmission channel exhibits a narrow bandwidth relative to said input video signal.

Claim 5

A system according to claim 1, wherein said input signal is a luminance signal; and said folding frequency is the frequency of a chrominance subcarrier.

Claim 6

A system according to claim 3, wherein an output video signal from said transmission channel exhibits a bandwidth compatible with NTSC standards.

Claim 7

In a system for processing a television-type signal, apparatus for encoding and decoding high frequency video information comprising: means for providing an input image representative video signal having a frequency spectrum including a high frequency band containing information to be encoded, and a lower frequency band: means for folding said frequency spectrum of said input video signal around a prescribed folding frequency in said lower frequency band to provide a folded video signal; means for combining said input video signal and said folded video signal to produce a combined video signal; means for low pass filtering said combined video signal to provide a filtered signal, said low pass filtering means having a cut-off frequency corresponding to said folding frequency; means for separating said filtered combined signal into a filtered video signal component and a filtered folded video signal component; means for unfolding said filtered folded video signal component around said folding frequency to produce an unfolded video signal containing frequencies in said high frequency band; and means for joining said unfolded video signal to said high frequency band of said filtered video signal component from said separating means to produce an output video signal having a high frequency band with the uppermost frequencies thereof being determined primarily by said unfolded video signal.

Claim 8

In a system for processing a television-type signal, apparatus for encoding and decoding high frequency video information comprising: means for providing an input image representative video signal having a frequency spectrum including a high frequency band containing information to be encoded, and a lower frequency band: means for folding said frequency spectrum of said input video signal around a prescribed folding frequency in said lower frequency band to provide a folded video signal; means for combining said input video signal and said folded video signal to produce a combined video signal; means for low pass filtering said combined video signal to provide a filtered signal, said low pass filtering means having a cut-off frequency corresponding to said folding frequency; means for separating said filtered combined signal into a filtered video signal component and a filtered folded video signal component; means for unfolding said filtered folded video signal component around said folding frequency to produce an unfolded video signal containing frequencies in said high frequency band; and means for joining said unfolded video signal to said high frequency band of said filtered video signal component from said separating means to produce an output video signal having a high frequency band with the uppermost frequencies thereof being determined primarily by said unfolded video signal.

Claim 9

A system according to claim 6, wherein said low pass filtering means exhibits an amplitude attenuation characteristic that is substantially anti-symmetrical with respect to said folding frequency.

Claim 10

A system according to claim 6, wherein said input video signal is a wideband video signal; said combined video signal is conveyed via a transmission channel including bandwidth restricting means whereby an output signal from said transmission channel exhibits a narrow bandwidth relative to said input video signal, said output signal from said transmission channel being applied to said low pass filtering means; and said output video signal is a wideband video signal relative to said output signal from said transmission channel.

Claim 11

A system according to claim 6, wherein said input signal is a luminance signal; and said folding frequency is the frequency of a chrominance subcarrier.

Claim 12

A system according to claim 8, wherein an output video signal from said transmission channel exhibits a bandwidth compatible with NTSC standards.

Claim 13

In a receiver for processing a received television-type video signal with a first component occupying upper and lower frequency bands, said upper frequency band containing an encoded second component, apparatus comprising: means for low pass filtering said video signal to provide a filtered video signal, said low pass filtering means having a cut-off frequency within said upper frequency band; means responsive to said filtered video signal for separating said first and second components; means for unfolding the frequency spectrum of said separated second component around said cut-off frequency of said low pass filtering means; and means for combining said unfolded separated second component with said separated first component to produce an output video signal with the highest frequencies thereof determined primarily by the frequency spectrum of said unfolded second component.

Claim 14

In a receiver for processing a received television-type video signal with a first component occupying upper and lower frequency bands, said upper frequency band containing an encoded second component, apparatus comprising: means for low pass filtering said video signal to provide a filtered video signal, said low pass filtering means having a cut-off frequency within said upper frequency band; means responsive to said filtered video signal for separating said first and second components; means for unfolding the frequency spectrum of said separated second component around said cut-off frequency of said low pass filtering means; and means for combining said unfolded separated second component with said separated first component to produce an output video signal with the highest frequencies thereof determined primarily by the frequency spectrum of said unfolded second component.

Claim 15

A system according to claim 11, wherein said low pass filtering means exhibits an amplitude attenuation characteristic that is substantially anti-symmetrical with respect to said cut-off frequency.

Claim 16

A system according to claim 11, wherein said video signal is a luminance signal; and said cut-off frequency is the frequency of a chrominance subcarrier.

Claim 17

A system according to claim 11, wherein said received video signal exhibits a bandwidth compatible with NTSC standards.

Claim 18

A system according to claim 11, wherein said second component is present only during substantially motionless images; and said separating means is motion adaptive.

Claim 19

Apparatus according to claim 11, wherein said unfolding means comprises signal multiplier means responsive to said separated second component and to a reference signal.

Claim 20

Apparatus according to claim 16, wherein said reference signal exhibits a controlled phase.

Claim 21

Apparatus according to claim 11, wherein said received television-type video signal contains chrominance information, and luminance information comprising said first and second components; said encoded second component reverses phase from one image frame to the next and is present only during substantially motionless images; said separating means is responsive to said luminance information and is motion adaptive; and said unfolding means responds to a reference signal having a phase which reverses from frame to frame.