Video recording with alternate period inversion and low-frequency premphasis

Claim 2

A signal translating system comprising in combination: means providing a video signal source for developing a video signal; utilization means; means coupled between said video signal source and said utilization means for inverting the polarity of portions of said video signal at a rate substantially less that the highest video frequency to be reproduced to substantially reduce the amplitude of the low-frequency components of said video signal; and means for preemphasizing said low-frequency components coupled between said polarity inverting means and said utilization means.

Claim 3

A signal translating system is defined in claim 1 wherein said utilization means comprises a magnetic recording device for recording on a magnetic recording medium the modified video signal with portions inverted in polarity and low-frequency components preemphasized.

Claim 4

A signal translating system is defined in claim 1 wherein said utilization means comprises a magnetic recording device for recording on a magnetic recording medium the modified video signal with portions inverted in polarity and low-frequency components preemphasized.

Claim 5

A signal translating system as defined in claim 2 wherein the portions of said modified video signal inverted in polarity are of opposite polarity with respect to a datum potential than the other portions of said video signal.

Claim 6

A signal translating system as defined in claim 3 wherein said video signal includes picture information components and wherein said recording medium has a transfer characteristic including a substantially linear region and wherein the picture information components of said video signal are recorded within the linear region of the transfer characteristic of said recording medium.

Claim 7

A signal translating system comprising in combination: means providing a video signal source for developing a video signal including recurrent synchronizing signal components; recording means; means coupled between said video signal source and said recording means for inverting the polarity of portions of said video signal at a rate substantially less than the highest video frequency to be reproduced to substantially reduce the amplitude of the low-frequency components of said video signal; and means for preemphasizing said low-frequency components coupled between said polarity inverting means and said recording means.

Claim 8

A signal translating system comprising in combination: means providing a video signal source for developing a video signal including recurrent synchronizing signal components; recording means; means coupled between said video signal source and said recording means for inverting the polarity of portions of said video signal at a rate substantially less than the highest video frequency to be reproduced to substantially reduce the amplitude of the low-frequency components of said video signal; and means for preemphasizing said low-frequency components coupled between said polarity inverting means and said recording means.

Claim 9

A signal translating system as defined in claim 5 wherein the polarity of said video signal is inverted at a rate equal to one half the rate of said recurrent synchronizing signal components.

Claim 10

A signal translating system as defined in claim 5 wherein said recording means comprises a magnetic recording device for recording on a magnetic recording medium the modified video signal with portions inverted in polarity and low-frequency components preemphasized.

Claim 11

A signal translating system as defined in claim 7 wherein the portions of said modified video signal inverted in polarity are of opposite polarity with respect to a datum potential than the other portions of said video signal.

Claim 12

A signal translating system as defined in claim 8 wherein said video signal includes picture information components and wherein said recording medium has a transfer characteristic including a substantially linear region and a relatively nonlinear region and wherein the picture information components of said video signal are recorded within the linear region of the transfer characteristic of said recording medium.

Claim 13

A signal translating system as defined in claim 9 wherein the recurrent synchronizing signal components of said video signal are recorded within the nonlinear region of the transfer characteristic of said recording medium.

Claim 14

A signal translating system comprising in combination: means providing a video signal source for developing a video signal; signal oUtput means; means modifying said video signal coupled between said video signal source and said signal output means for inverting the polarity of first portions of said video signal with respect to other portions thereof at a rate substantially less than the highest video frequency to be reproduced to substantially reduce the amplitude of the low-frequency components of said video signal; recording means; means for preemphasizing said low-frequency components coupled between said polarity inverting means and said recording means; and means coupled between said signal output means and said recording means for synchronously inverting the polarity of one of said portions of said modified video signal at said rate to derive a signal corresponding to said video signal before modification.

Claim 15

A signal translating system comprising in combination: means providing a video signal source for developing a video signal; signal oUtput means; means modifying said video signal coupled between said video signal source and said signal output means for inverting the polarity of first portions of said video signal with respect to other portions thereof at a rate substantially less than the highest video frequency to be reproduced to substantially reduce the amplitude of the low-frequency components of said video signal; recording means; means for preemphasizing said low-frequency components coupled between said polarity inverting means and said recording means; and means coupled between said signal output means and said recording means for synchronously inverting the polarity of one of said portions of said modified video signal at said rate to derive a signal corresponding to said video signal before modification.

Claim 16

In a system for the recording of a video signal on a magnetic medium having a transfer characteristic which includes a nonlinear region, said signal including recurrent synchronizing signal components, the combination of: input means adapted to receive a video signal having recurrent synchronizing components; means coupled to said input means for inverting the polarity of portions of said video signal with respect to other portions thereof at a rate equal to one half the rate of said recurrent synchronizing signal components to substantially reduce the amplitude of the low-frequency components of said video signal, and wherein the portions of said video signal inverted in polarity and said other portions of said video signal are of different polarity with respect to a datum potential, said polarity inverting means also including means for adjusting the level of the recurrent synchronizing components of said video signal; means coupled to the output of said inverting means for preemphasizing the low-frequency components of said video signal; and means for recording the output signal from said preemphasizing means on said recording medium wherein the recurrent synchronizing components of said video signal are recorded within the nonlinear region of the transfer characteristic of said magnetic medium.

Claim 17

In a system for the recording of a video signal on a magnetic medium having a transfer characteristic which includes a nonlinear region, said signal including recurrent synchronizing signal components, the combination of: input means adapted to receive a video signal having recurrent synchronizing components; means coupled to said input means for inverting the polarity of portions of said video signal with respect to other portions thereof at a rate equal to one half the rate of said recurrent synchronizing signal components to substantially reduce the amplitude of the low-frequency components of said video signal, and wherein the portions of said video signal inverted in polarity and said other portions of said video signal are of different polarity with respect to a datum potential, said polarity inverting means also including means for adjusting the level of the recurrent synchronizing components of said video signal; means coupled to the output of said inverting means for preemphasizing the low-frequency components of said video signal; and means for recording the output signal from said preemphasizing means on said recording medium wherein the recurrent synchronizing components of said video signal are recorded within the nonlinear region of the transfer characteristic of said magnetic medium.

Claim 18

In a system for the recording of a video signal representing successive scanning intervals on a recording medium having a transfer characteristic which includes a linear region, said signal having picture information components and recurrent sync pulse components, the combination of: means for sampling the video signal to provide a pair of output signals corresponding respectively to different portions of said video signal and representative of alternate scanning intervals and in which the tips of said sync pulse portions are set to a prescribed level; means for inverting one of said output signals; means for adding said inverted output signal to said other one of said output signals to produce a single composite signal having a reduced magnitude of low-frequency components; means for processing said signal including preemphasizing said low-frequency components of said single composite signal for recording on said recording medium; and the picture information components of said signal substantially recorded within the linear region of the transfer characteristic of said recording medium.

Claim 19

In a system for the recording of a video signal representing successive scanning intervals on a recording medium having a transfer characteristic which includes a linear region, said signal having picture information components and recurrent sync pulse components, the combination of: means for sampling the video signal to provide a pair of output signals corresponding respectively to different portions of said video signal and representative of alternate scanning intervals and in which the tips of said sync pulse portions are set to a prescribed level; means for inverting one of said output signals; means for adding said inverted output signal to said other one of said output signals to produce a single composite signal having a reduced magnitude of low-frequency components; means for processing said signal including preemphasizing said low-frequency components of said single composite signal for recording on said recording medium; and the picture information components of said signal substantially recorded within the linear region of the transfer characteristic of said recording medium.

Claim 20

A recording system for an electrical signal representing successive scanning intervals comprising in combination: means for separating said electrical signal into two signals, one of said two signals corresponding to those portions of said electrical signal which represent alternate scanning intervals, and the other of said two signals corresponding to those portions of said electrical signal which represent scanning intervals other than that of said one signal; means for combining said two signals to produce a third signal corresponding to said electrical signal but having portions representing alternate scanning intervals of opposite polarity with respect to a datum potential and a reduced magnitude of low-frequency coMponents; means for precessing said third signal including preemphasizing said low-frequency components of said third signal; and means for recording said processed third signal on a recording medium.

Claim 21

A recording system for an electrical signal representing successive scanning intervals comprising in combination: means for separating said electrical signal into two signals, one of said two signals corresponding to those portions of said electrical signal which represent alternate scanning intervals, and the other of said two signals corresponding to those portions of said electrical signal which represent scanning intervals other than that of said one signal; means for combining said two signals to produce a third signal corresponding to said electrical signal but having portions representing alternate scanning intervals of opposite polarity with respect to a datum potential and a reduced magnitude of low-frequency coMponents; means for precessing said third signal including preemphasizing said low-frequency components of said third signal; and means for recording said processed third signal on a recording medium.

Claim 22

A recording system comprising in combination: input means adapted to receive a video signal representing successive scanning intervals, said video signal having picture information components and recurrent horizontal sync pulse components; means coupled to said input means for providing gating signals coincident with said recurrent horizontal sync pulse components; first and second switching means, each respectively responsive to gating signals from said last mentioned means for providing a pair of output signals, one of said output signals corresponding to those portions of said video signal representative of alternate scanning intervals and the other of said output signals corresponding to those portions of said video signal representative of scanning intervals other than that of said one output signal; means coupled with said first and second switching means for adjusting the level of the horizontal sync pulse components of said video signal; means for reversing the polarity of the output signal from said first switching means; means coupled to said reversing means and said second switching means for adding said output signals obtained therefrom to provide a single signal corresponding to said video signal and in which the polarity of portions of the signal representative of alternate scanning intervals has been reversed and said signal portions are of different polarity with respect to a datum potential and in which the amplitude of the low-frequency components are substantially reduced; means for processing said single signal including preemphasizing said low-frequency components of said single signal; and means for recording said processed single signal on a recording medium having a transfer characteristic which includes a linear region wherein the picture information components of said single signal substantially fill the linear region of the transfer characteristic of said recording medium.

Claim 23

A recording system comprising in combination: input means adapted to receive a video signal representing successive scanning intervals, said video signal having picture information components and recurrent horizontal sync pulse components; means coupled to said input means for providing gating signals coincident with said recurrent horizontal sync pulse components; first and second switching means, each respectively responsive to gating signals from said last mentioned means for providing a pair of output signals, one of said output signals corresponding to those portions of said video signal representative of alternate scanning intervals and the other of said output signals corresponding to those portions of said video signal representative of scanning intervals other than that of said one output signal; means coupled with said first and second switching means for adjusting the level of the horizontal sync pulse components of said video signal; means for reversing the polarity of the output signal from said first switching means; means coupled to said reversing means and said second switching means for adding said output signals obtained therefrom to provide a single signal corresponding to said video signal and in which the polarity of portions of the signal representative of alternate scanning intervals has been reversed and said signal portions are of different polarity with respect to a datum potential and in which the amplitude of the low-frequency components are substantially reduced; means for processing said single signal including preemphasizing said low-frequency components of said single signal; and means for recording said processed single signal on a recording medium having a transfer characteristic which includes a linear region wherein the picture information components of said single signal substantially fill the linear region of the transfer characteristic of said recording medium.

Claim 24

A recording system for a video signal representing successive scanning intervals, wherein said signal includes recurrent horizontal picture information components and sync pulse components, said system comprising: means responsive to said horizontal sync components for generating gating signals; first and second switching means, each respectively responsive to gating signals from said last-mentioned means for providing a pair of output signals, one of said output signals corresponding to those portions of said video signal representative of alternate scanning intervals and the other of said output signals corresponding to those portions of said video signal representative of scanning intervals other than that of said first output signal; means coupled to the output of said first switching means for providing a polarity inversion of its output signal; means for clamping the tips of said sync pulse components of the output signals from said second switching means and said polarity inversion means to a common potential and then combining said signals to provide a single output signal corresponding to said video signal and in which the polarity of portions of the single output signal representative of alternate scanning intervals has been reversed and in which the amplitude of the low-frequency components are substantially reduced; means for processing said single output signal including preemphasizing said low-frequency components of said single output signal; and means for recording said processed single output signal on a recording medium having a transfer characteristic which includes a linear region, and wherein the level of the horizontal sync pulse components of said single signal is such that said picture information components substantially fill the linear region of the transfer characterisTic of said recording medium.

Claim 25

A recording system for a video signal representing successive scanning intervals, wherein said signal includes recurrent horizontal picture information components and sync pulse components, said system comprising: means responsive to said horizontal sync components for generating gating signals; first and second switching means, each respectively responsive to gating signals from said last-mentioned means for providing a pair of output signals, one of said output signals corresponding to those portions of said video signal representative of alternate scanning intervals and the other of said output signals corresponding to those portions of said video signal representative of scanning intervals other than that of said first output signal; means coupled to the output of said first switching means for providing a polarity inversion of its output signal; means for clamping the tips of said sync pulse components of the output signals from said second switching means and said polarity inversion means to a common potential and then combining said signals to provide a single output signal corresponding to said video signal and in which the polarity of portions of the single output signal representative of alternate scanning intervals has been reversed and in which the amplitude of the low-frequency components are substantially reduced; means for processing said single output signal including preemphasizing said low-frequency components of said single output signal; and means for recording said processed single output signal on a recording medium having a transfer characteristic which includes a linear region, and wherein the level of the horizontal sync pulse components of said single signal is such that said picture information components substantially fill the linear region of the transfer characterisTic of said recording medium.

Claim 26

A process for recording, comprising the steps of: receiving a video signal to be recorded; inverting the polarity of portions of said video signal at a rate substantially less than the highest video frequency to be reproduced to substantially reduce the amplitude of the low-frequency components of said video preemphasizing said low-frequency components of said video signal with portions inverted in polarity; and recording on a magnetic recording medium the modified video signal with portions inverted in polarity and low-frequency components preemphasized.

Claim 27

A process for recording, comprising the steps of: receiving a video signal to be recorded; inverting the polarity of portions of said video signal at a rate substantially less than the highest video frequency to be reproduced to substantially reduce the amplitude of the low-frequency components of said video preemphasizing said low-frequency components of said video signal with portions inverted in polarity; and recording on a magnetic recording medium the modified video signal with portions inverted in polarity and low-frequency components preemphasized.

Claim 28

A process for recording as defined in claim 17 wherein said video signal includes picture information components and wherein said recording medium has a transfer characteristic including a substantially linear region and wherein the picture information components of said video signal are recorded within the linear region of the transfer characteristic of said recording medium.

Claim 29

A process for recording an electrical signal representing successive scanning intervals comprising the steps of: receiving an electrical signal representing successive scanning intervals; separating said electrical signal into two signals, one of said two signals corresponding to those portions of said electrical signal which represent alternate scanning intervals, and the other of said two signals corresponding to those portions of said electrical signal which represent scanning intervals other than that of said one signal; combining said two signals to produce a third signal corresponding to said electrical signal but having portions representing alternate scanning intervals of opposite polarity with respect to a datum potential and a reduced magnitude of low-frequency components; processing said third signal including preemphasizing said low-frequency components of said third signal; and recording said processed third signal on a recording medium.

Claim 30

A process for recording an electrical signal representing successive scanning intervals comprising the steps of: receiving an electrical signal representing successive scanning intervals; separating said electrical signal into two signals, one of said two signals corresponding to those portions of said electrical signal which represent alternate scanning intervals, and the other of said two signals corresponding to those portions of said electrical signal which represent scanning intervals other than that of said one signal; combining said two signals to produce a third signal corresponding to said electrical signal but having portions representing alternate scanning intervals of opposite polarity with respect to a datum potential and a reduced magnitude of low-frequency components; processing said third signal including preemphasizing said low-frequency components of said third signal; and recording said processed third signal on a recording medium.