Staggered scan facsimile

Claim 7

A facsimile transmitter including, image scanning means for serially sampling an image attribute at a succession of discrete areas uniformly spaced apart and arranged in a predetermined order in scan lines, means for generating a series of image representing video signals in response to and in the order of said samples, means to generate a stagger command signal which differs for successive scan linEs, and means to vary the longitudinal position of said scan lines in response to said command signals.

Claim 8

A facsimile transmitter including, image scanning means for serially sampling an image attribute at a succession of discrete areas uniformly spaced apart and arranged in a predetermined order in scan lines, means for generating a series of image representing video signals in response to and in the order of said samples, means to generate a stagger command signal which differs for successive scan linEs, and means to vary the longitudinal position of said scan lines in response to said command signals.

Claim 9

The transmitter of claim 4 further including means to transmit said video signals at fixed intervals and at fixed phase.

Claim 10

The transmitter of claim 5 further including means to transmit said command signals.

Claim 11

An image transmitter including a line scanner synchronized to a sub-multiple of a periodic clock signal having a fixed rate, means to generate a two-level asynchronous signal from said scanner, representative of immediately adjacent and successive scan lines, means to generate an odd-even command signal which has one value for even-numbered scans and another value for odd-numbered numbered scans, means to sample said asynchronous signal at said clock rate to generate a synchronous signal having transitions restricted to times spaced at the rate of said clock signal, and means to vary the phase of said sampling times by one-half the period of said clock signal in response to said command signal.

Claim 12

An image transmitter including a line scanner synchronized to a sub-multiple of a periodic clock signal having a fixed rate, means to generate a two-level asynchronous signal from said scanner, representative of immediately adjacent and successive scan lines, means to generate an odd-even command signal which has one value for even-numbered scans and another value for odd-numbered numbered scans, means to sample said asynchronous signal at said clock rate to generate a synchronous signal having transitions restricted to times spaced at the rate of said clock signal, and means to vary the phase of said sampling times by one-half the period of said clock signal in response to said command signal.

Claim 13

The transmitter of claim 7 further including means to resynchronize said transitions into a fixed phase relation with said clock signal.

Claim 14

The transmitter of claim 8 further including means to time division multiplex said odd-even command signal with said resynchronized signal.

Claim 15

An image transmitter including, a scanner synchronized to sub-multiple of a periodic clock signal having a fixed rate, means to generate a multiple level amplitude quantized asynchronous signal from said scanner, means to generate a multiple level command signal which varies from scan line to scan line in a predetermined fashion, means to sample said asynchronous signal at said clock rate to generate a synchronous signal having transitions restricted to times spaced at the rate of said clock signal, and means to vary the phase of said sampling times in response to said command signal, said sampling times being staggered from line to line.

Claim 16

An image transmitter including, a scanner synchronized to sub-multiple of a periodic clock signal having a fixed rate, means to generate a multiple level amplitude quantized asynchronous signal from said scanner, means to generate a multiple level command signal which varies from scan line to scan line in a predetermined fashion, means to sample said asynchronous signal at said clock rate to generate a synchronous signal having transitions restricted to times spaced at the rate of said clock signal, and means to vary the phase of said sampling times in response to said command signal, said sampling times being staggered from line to line.

Claim 17

An image receiver including, an image signal recorder, means to receive a synchronous video signal serially corresponding to immediately adjacent and successively sampled scan lines having staggered sampling positions, means to synchronize said recorder to said scan lines, means to alter the phase of said video signals between scan lines to compensate for said staggered sampling positions, and means to apply said phase altered video signals to said video recorder.

Claim 18

An image receiver including, an image signal recorder, means to receive a synchronous video signal serially corresponding to immediately adjacent and successively sampled scan lines having staggered sampling positions, means to synchronize said recorder to said scan lines, means to alter the phase of said video signals between scan lines to compensate for said staggered sampling positions, and means to apply said phase altered video signals to said video recorder.

Claim 19

An image receiver including, a scanning image recorder, means to synchronize successive scans of said recorder to a sub-multiple of a clock signal, means to receive a video signal synchronized with said clock signal and serially corresponding to successive samples from immediately adjacent scan lines having staggered sampling positions, means to alter the phase of said video signal with respect to said clock signal between scans to compensate for the stagger of said sampling positions, and means to apply said phase altered video signal to said recorder.

Claim 20

An image receiver including, a scanning image recorder, means to synchronize successive scans of said recorder to a sub-multiple of a clock signal, means to receive a video signal synchronized with said clock signal and serially corresponding to successive samples from immediately adjacent scan lines having staggered sampling positions, means to alter the phase of said video signal with respect to said clock signal between scans to compensate for the stagger of said sampling positions, and means to apply said phase altered video signal to said recorder.

Claim 21

The receiver of claim 12 in which said phase altering means alters the phase of said video signal with respect to said clock signal in a predetermined repetitive pattern which is staggered from line to line.

Claim 22

An image receiver including, a scanning image recorder, means to receive a periodic clock signal, means to receive a video signal synchronous with said clock signal and containing multiplexed synchronizing and command signals, means to demultiplex said synchronizing signals for operating said scanning image recorder in accordance therewith, means to demultiplex said command signals, means to alter the phase of said video signal with respect to said clock signal in response to said command signals, and means to apply said phase altered video signal to said image recorder.

Claim 23

An image receiver including, a scanning image recorder, means to receive a periodic clock signal, means to receive a video signal synchronous with said clock signal and containing multiplexed synchronizing and command signals, means to demultiplex said synchronizing signals for operating said scanning image recorder in accordance therewith, means to demultiplex said command signals, means to alter the phase of said video signal with respect to said clock signal in response to said command signals, and means to apply said phase altered video signal to said image recorder.

Claim 24

An image receiver including, a scanning image recorder, means to receive a periodic clock signal, means to receive a video signal synchronous with said clock signal and containing periodic time-multiplexed control signals, said control signals comprising synchronizing signals and command signals, means to demultiplex said synchronizing signals for operating said recorder in accordance therewith, means to demultiplex said command signals, storage means to store said command signals between said control signals, means responsive to said stored command signals to alter the phase of said video signals with respect to said clock signal, and means to apply said phase altered video signals to said image recorder.

Claim 25

An image receiver including, a scanning image recorder, means to receive a periodic clock signal, means to receive a video signal synchronous with said clock signal and containing periodic time-multiplexed control signals, said control signals comprising synchronizing signals and command signals, means to demultiplex said synchronizing signals for operating said recorder in accordance therewith, means to demultiplex said command signals, storage means to store said command signals between said control signals, means responsive to said stored command signals to alter the phase of said video signals with respect to said clock signal, and means to apply said phase altered video signals to said image recorder.

Claim 26

An image receiver including, an image recorder, means to receive a periodic clock signal, means to receive a video signal synchronous with said clock signal and containing periodic time-multiplexed control signals, said control signals comprising synchronizing signals and two-level command signals, means to demultiplex said synchronizing signals for operating said image recorder in accordance therewith, means to demultiplex said command signals, means to store said command signals between said control signals, means responsive to said stored command signals to alter the phase of said video signal with respect to said clock signal by one-half the period of said clock signal, and means to apply said phase altered video signal to said image recorder.

Claim 27

An image receiver including, an image recorder, means to receive a periodic clock signal, means to receive a video signal synchronous with said clock signal and containing periodic time-multiplexed control signals, said control signals comprising synchronizing signals and two-level command signals, means to demultiplex said synchronizing signals for operating said image recorder in accordance therewith, means to demultiplex said command signals, means to store said command signals between said control signals, means responsive to said stored command signals to alter the phase of said video signal with respect to said clock signal by one-half the period of said clock signal, and means to apply said phase altered video signal to said image recorder.

Claim 28

A visual communication system comprising, transmitter image scanner means for generating a series of discrete video signals corresponding to an image attribute sampled at a succession of discrete areas uniformly spaced apart and arranged in transmitter scan lines, means to generate a staggered command signal which differs for successive scan lines, means to vary the longitudinal position of said transmitter scan lines in response to said command signals, means to transfer said video signals at fixed phase to a receiver, means to transfer said command signals to said receiver, scanning means at said receiver responsive to said transferred video signals to generate a series of visual signals corresponding to an image attribute at a succession of discrete areas uniformly spaced apart and arranged in receiver scan lines, and means to vary the longitudinal position of said receiver scan lines in response to said transferred command signals.

Claim 29

A visual communication system comprising, transmitter image scanner means for generating a series of discrete video signals corresponding to an image attribute sampled at a succession of discrete areas uniformly spaced apart and arranged in transmitter scan lines, means to generate a staggered command signal which differs for successive scan lines, means to vary the longitudinal position of said transmitter scan lines in response to said command signals, means to transfer said video signals at fixed phase to a receiver, means to transfer said command signals to said receiver, scanning means at said receiver responsive to said transferred video signals to generate a series of visual signals corresponding to an image attribute at a succession of discrete areas uniformly spaced apart and arranged in receiver scan lines, and means to vary the longitudinal position of said receiver scan lines in response to said transferred command signals.