Redundancy reduction system for video signals

Claim 2

In a redundancy reduction system for transmitting samples from a video signal which differ in amplitude from their corresponding samples having the same location in a previous video frame, means for addressing the transmitted samples comprising means for forcing the transmission of a reference sample in each video frame and periodic samples at subintervals within said video frame whether or not a difference exists between these samples and their corresponding samples from a previous frame, and means for generating and transmitting with each transmitted sample an address code which indicates the relative position of said each transmitted sample within said subinterval of said video frame.

Claim 3

In a system as defined in claim 1 wherein the addressing means includes means for generating a unique address code for the reference sample in a video frame.

Claim 4

In a redundancy reduction system for transmitting a signal having redundant periodic intervals, means for periodically sampling said signal, mean for transmitting a sample at the beginning of each of said periodic intervals and at periodic subintervals within each of said periodic intervals, a means for developing the amplitude difference between each other sample within each of said subintervals and its corresponding sample having the same time location within a previous periodic interval, means for transmitting said each other sample if a significant amplitude difference is determined to exist, and means for transmitting with each transmitted sample an address code which indicates the time position of said transmitted sample within said subinterval.

Claim 5

In a redundancy reduction system for transmitting a signal having redundant periodic intervals, means for periodically sampling said signal, mean for transmitting a sample at the beginning of each of said periodic intervals and at periodic subintervals within each of said periodic intervals, a means for developing the amplitude difference between each other sample within each of said subintervals and its corresponding sample having the same time location within a previous periodic interval, means for transmitting said each other sample if a significant amplitude difference is determined to exist, and means for transmitting with each transmitted sample an address code which indicates the time position of said transmitted sample within said subinterval.

Claim 6

In a system as defined in claim 3 wherein the means for transmitting an address code further includes means for generating a unique address code for the sample at the beginning of each of said periodic intervals.

Claim 7

Transmitting apparatus for reducing the redundancy in the transmitted information derived from a video signal having time intervals and subintervals identified as frames and lines, respectively, said apparatus comprising means for sampling said video signal at a plurality of corresponding during each of said line subintervals, means for storing samples from one complete frame of said video signal, means for developing the amplitude difference between each sample and its corresponding sample from a previous frame stored in said memory means and having the same line location, means for coupling said each sample to a transmission channel if a significant amplitude difference is found to exist, means for generating an address code to be transmitted with each transmitted sample, the address code for the first sample in a video frame being a unique word and all other codes indicating only the line position of its corresponding sample.

Claim 8

Transmitting apparatus for reducing the redundancy in the transmitted information derived from a video signal having time intervals and subintervals identified as frames and lines, respectively, said apparatus comprising means for sampling said video signal at a plurality of corresponding during each of said line subintervals, means for storing samples from one complete frame of said video signal, means for developing the amplitude difference between each sample and its corresponding sample from a previous frame stored in said memory means and having the same line location, means for coupling said each sample to a transmission channel if a significant amplitude difference is found to exist, means for generating an address code to be transmitted with each transmitted sample, the address code for the first sample in a video frame being a unique word and all other codes indicating only the line position of its corresponding sample.

Claim 9

Apparatus as defined in claim 5 which includes a means to load said memory means with an initial frame of identical samples, and means for coupling this frame of identical samples to said transmission channel.

Claim 10

In a redundancy reduction system in which a sample is transmitted from a video signal having time intervals called frames and scan lines oNly if the sample differs significantly in amplitude from a corresponding sample in a previous video frame, the transmitted samples being utilized at a receiving end of the system to replenish samples in a frame memory which stores samples for an entire video frame, means for addressing each of the transmitted samples in order to insure that the proper samples are replenished in the frame memory at the receiving end of the system, said addressing means comprising means for generating a unique code for the first sample in a video frame, means for generating code words which indicate the positioning of each sample in a scan line of said video signal, and means for forcing the transmission of the first sample in a video frame and the first sample in each video scan line whether or not a significant difference is found to exist.

Claim 11

In a redundancy reduction system in which a sample is transmitted from a video signal having time intervals called frames and scan lines oNly if the sample differs significantly in amplitude from a corresponding sample in a previous video frame, the transmitted samples being utilized at a receiving end of the system to replenish samples in a frame memory which stores samples for an entire video frame, means for addressing each of the transmitted samples in order to insure that the proper samples are replenished in the frame memory at the receiving end of the system, said addressing means comprising means for generating a unique code for the first sample in a video frame, means for generating code words which indicate the positioning of each sample in a scan line of said video signal, and means for forcing the transmission of the first sample in a video frame and the first sample in each video scan line whether or not a significant difference is found to exist.

Claim 12

In a redundancy reduction system as defined in claim 7 wherein the receiving end of the system includes means for prohibiting replenishment of said receiving frame memory until a predetermined number of samples have been received.

Claim 13

Redundancy reduction transmitting apparatus for use with video signals having time intervals defined as frames, scan lines and horizontal and vertical flyback intervals, said apparatus comprising means for periodically sampling said video signal, memory means for storing a complete frame of samples, means for amplitude comparing each sample with its corresponding sample stored in said memory means having the same position in a video frame, buffer memory means for storing the samples to be transmitted, means for writing a sample into said buffer memory means when a significant difference is found to exist by said amplitude comparison means, means for generating an address word which indicates the position of each sample in its scan line, means for generating a unique word, means for writing the first sample of each video frame and the first sample of each scan line into said buffer memory mean whether or not a difference is found to exist by said amplitude comparison means, means for writing the unique word into said buffer memory along with said first sample of each video frame and for writing said address word into said buffer memory along with all other samples written into said buffer memory means, and means for reading out the samples and words stored in said buffer memory means and coupling them to a transmission channel.

Claim 14

Redundancy reduction transmitting apparatus for use with video signals having time intervals defined as frames, scan lines and horizontal and vertical flyback intervals, said apparatus comprising means for periodically sampling said video signal, memory means for storing a complete frame of samples, means for amplitude comparing each sample with its corresponding sample stored in said memory means having the same position in a video frame, buffer memory means for storing the samples to be transmitted, means for writing a sample into said buffer memory means when a significant difference is found to exist by said amplitude comparison means, means for generating an address word which indicates the position of each sample in its scan line, means for generating a unique word, means for writing the first sample of each video frame and the first sample of each scan line into said buffer memory mean whether or not a difference is found to exist by said amplitude comparison means, means for writing the unique word into said buffer memory along with said first sample of each video frame and for writing said address word into said buffer memory along with all other samples written into said buffer memory means, and means for reading out the samples and words stored in said buffer memory means and coupling them to a transmission channel.

Claim 15

Transmitting apparatus as defined in claim 9 wherein the address generating means includes means for prohibiting writing into said buffer memory means during the horizontal and vertical flyback intervals in said video signal.

Claim 16

Transmitting apparatus as defined in claim 9 wherein said amplitude comparison means includes means for determining the remaining capacity of said buffer memory means.

Claim 17

Apparatus as defined in claim 9 wherein the apparatus further includes means for generating a complete frame of indentical words, and means for coupling the complete frame of identical words to said frame memory as an initial frame of video samples.

Claim 18

Receiving apparatus for generating a continuous video signal having time intervals defined as lines and frames in response to received video samples representing elements in a video frame which have changed from a previously received video frame, each of said video samples having associated therewith an address code word which indicates the position of its corresponding video sample within its respective line interval, said apparatus comprising a buffer memory for storing each of said received video samples, a display monitor having a scanning beam, an address generator means for developing code words which indicate the relative position of the scanning beam within said display monitor, means for comparing the word generated by said address generating means and the address code word associated with a video sample stored in said buffer memory means, means for reading out said buffer memory means in response to an output from said compArison means indicating that said generated word and said address code word are identical, means for coupling the output from said buffer memory means to a frame memory, and means for coupling the information in said frame memory to said display monitor.

Claim 19

Receiving apparatus for generating a continuous video signal having time intervals defined as lines and frames in response to received video samples representing elements in a video frame which have changed from a previously received video frame, each of said video samples having associated therewith an address code word which indicates the position of its corresponding video sample within its respective line interval, said apparatus comprising a buffer memory for storing each of said received video samples, a display monitor having a scanning beam, an address generator means for developing code words which indicate the relative position of the scanning beam within said display monitor, means for comparing the word generated by said address generating means and the address code word associated with a video sample stored in said buffer memory means, means for reading out said buffer memory means in response to an output from said compArison means indicating that said generated word and said address code word are identical, means for coupling the output from said buffer memory means to a frame memory, and means for coupling the information in said frame memory to said display monitor.

Claim 20

Apparatus as defined in claim 13 wherein the means for reading out said buffer memory means includes an AND circuit, one input of which is energized after said buffer memory means has been initially filled to its maximum capacity.

Claim 21

A redundancy reduction transmitting apparatus for use with video signals having time intervals defined as frames and subintervals defined as lines having horizontal and vertical flyback intervals, said apparatus comprising pulse generating means, means for sampling said video signal in response to said pulse generating means, means responsive to said pulse generating means for developing a first digital word which indicates the position of each video sample in a line subinterval and a second digital word which indicates the line in a video frame which contains said each video sample, means for amplitude comparing each video sample with a corresponding sample from a previous frame having the same position in said previous frame, a buffer memory means having an input and an output and read and write control inputs, means for coupling each video sample and said first digital word to the input of said buffer memory means, means for activating the write control input of said buffer memory means both when a significant amplitude difference is found to exist by said amplitude comparison means and when said generating means indicates by said first digital word that the first sample in each line is being presented to the input of said buffer memory means, and means for activating the read control input of said buffer memory means to a transmission channel.

Claim 22

A redundancy reduction transmitting apparatus for use with video signals having time intervals defined as frames and subintervals defined as lines having horizontal and vertical flyback intervals, said apparatus comprising pulse generating means, means for sampling said video signal in response to said pulse generating means, means responsive to said pulse generating means for developing a first digital word which indicates the position of each video sample in a line subinterval and a second digital word which indicates the line in a video frame which contains said each video sample, means for amplitude comparing each video sample with a corresponding sample from a previous frame having the same position in said previous frame, a buffer memory means having an input and an output and read and write control inputs, means for coupling each video sample and said first digital word to the input of said buffer memory means, means for activating the write control input of said buffer memory means both when a significant amplitude difference is found to exist by said amplitude comparison means and when said generating means indicates by said first digital word that the first sample in each line is being presented to the input of said buffer memory means, and means for activating the read control input of said buffer memory means to a transmission channel.

Claim 23

Transmitting apparatus as defined in claim 15 wherein the word generating means includes means for generating a unique word when the first sample of a video frame is presented to the input of said buffer memory means.

Claim 24

Transmitting apparatus as defined in claim 15 wherein the generating means includes means responsive to said first and second digital words for preventing activation of the write input of said buffer memory means during the horizontal and vertical flyback intervals.

Claim 25

Transmitting apparatus as defined in claim 15 wherein said amplitude comparison means includes means for detecting the remaining capacity of said buffer memory means, whereby the write control input is activated when the number of samples stored in said buffer memory is lower than a predetermined threshold level regardless of whether or not a significant amplitude difference is found to exist by said amplitude comparison means.

Claim 26

A redundancy reduction receiving apparatus for generating a video display in response to video samples received on a transmission channel each of which video samples has associated therewith an address word which indicates the position of the video sample in a scanning line within a video frame, means for generating a pulse in response to receiving each video sample, a display monitor for generating a video display in response to a continuous video signal, means responsive to said pulse for generating a first digital word representing the line position of the scanning beam in said display monitor and a second digital word representing the number of the line being scanned by said display monitor, a buffer memory means having an input and an output and read and write control inputs for storing each of the received video samples, a counting means responsive to said developed pulse for generating an energizing signal after said buffer memory means has been initially filled to its maximum capacity, a comparison circuit for generating an energizing signal at its output when the first digital word developed by said generating means is identical to the address word associated with a video sample available for readout from said Buffer memory means, means for energizing the read control input of said buffer memory means in response to the presence of energizing signals from both said counter means and said comparison circuit, means for coupling the output of video samples from said buffer memory means to the input of a frame memory means, and means connected between said frame memory means and said display monitor for generating a continuous video signal in response to the video samples stored in said frame memory.

Claim 27

A redundancy reduction receiving apparatus for generating a video display in response to video samples received on a transmission channel each of which video samples has associated therewith an address word which indicates the position of the video sample in a scanning line within a video frame, means for generating a pulse in response to receiving each video sample, a display monitor for generating a video display in response to a continuous video signal, means responsive to said pulse for generating a first digital word representing the line position of the scanning beam in said display monitor and a second digital word representing the number of the line being scanned by said display monitor, a buffer memory means having an input and an output and read and write control inputs for storing each of the received video samples, a counting means responsive to said developed pulse for generating an energizing signal after said buffer memory means has been initially filled to its maximum capacity, a comparison circuit for generating an energizing signal at its output when the first digital word developed by said generating means is identical to the address word associated with a video sample available for readout from said Buffer memory means, means for energizing the read control input of said buffer memory means in response to the presence of energizing signals from both said counter means and said comparison circuit, means for coupling the output of video samples from said buffer memory means to the input of a frame memory means, and means connected between said frame memory means and said display monitor for generating a continuous video signal in response to the video samples stored in said frame memory.

Claim 28

Receiving apparatus as defined in claim 19 wherein said buffer memory means is prohibited from storing input video samples until a unique address word associated with the first video sample in a frame is received.