Technique for the time compression multiplexing of three television signals
First Claim
1. A method of transmitting three successive television signals from a television source comprising the steps of:
- (a) transmitting a first line or field television signal from a television source as is, but time compressed by a predetermined amount, to fit in a first portion of a line or field period, respectively, of a standard television signal;
(b) transmitting a second line or field television signal from the television source as a first differential signal, but time compressed by a predetermined amount, to fit in a second portion of said line or field period, respectively, of the standard television signal not forming a part of said first portion; and
(c) transmitting a third line or field television signal from the television source as a second differential signal, but time compressed by a predetermined amount, to fit in a third portion of said line or field period, respectively, of the standard television signal not forming a part of said first and second portions.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a Time Compression Multiplexing (TCM) technique for transmitting three consecutive television picture signals from a television picture source during the time period normally used to send one television picture signal. More particularly, three consecutive lines or fields from a TV signal source are compressed into an ordinary line or field period, respectively, by sending one line or field as is, but time compressed, in one portion of a line or field period and sending two other lines or fields as differential signals, also time compressed, to occupy two separate and different portions of the same line or field period as is used by the first one line or field. With such technique it is possible to send three consecutive line or field signals from each of three separate colocated or non-colocated TV sources on a Time Division Multiple Access (TDMA) basis.
-
Citations
24 Claims
-
1. A method of transmitting three successive television signals from a television source comprising the steps of:
-
(a) transmitting a first line or field television signal from a television source as is, but time compressed by a predetermined amount, to fit in a first portion of a line or field period, respectively, of a standard television signal; (b) transmitting a second line or field television signal from the television source as a first differential signal, but time compressed by a predetermined amount, to fit in a second portion of said line or field period, respectively, of the standard television signal not forming a part of said first portion; and (c) transmitting a third line or field television signal from the television source as a second differential signal, but time compressed by a predetermined amount, to fit in a third portion of said line or field period, respectively, of the standard television signal not forming a part of said first and second portions. - View Dependent Claims (2, 3, 4)
-
-
5. A television signal transmitter comprising:
-
first multiplexing means (16) responsive to three successive picture signals from a standard television signal source for generating one of said three successive picture signals as is as one of three output signals from the first multiplexing means and for generating a first and a second differential signal between said one of the three successive picture signals generated as is and the other two of the three successive picture signals, respectively, as the remaining two of the three output signals from the first multiplexing means; second multiplexing means (17) responsive to the three output signals from said first multiplexing means for time compressing said one as is output signal by a first predetermined amount to fit in a first portion of the standard television signal time period and for time compressing each of said first and second differential output signals by a second predetermined amount to fit in a second and a third portion, respectively, of said standard television signal time period not forming a part of said first portion; and means (18-21) capable of transmitting the time compressed signals from the second multiplexing means during an associated standard television picture signal time period. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A television signal receiver responsive to an input signal from a predetermined remote transmitter during each period of a time division multiple access sequence, the input signal comprising three concurrently received signals derived from three successive television picture signals of a predetermined television picture source, where one of the concurrently received signals includes one of said three television picture signals transmitted as is, but time compressed, and the other two of the three concurrently received signals are first and second differential signals derived as differences between said one of the three television picture signals from the television picture source and each of the other two of the three television picture signals, respectively, from the television picture source also time compressed, the receiver comprising:
-
means capable of demodulating and separating each of the three concurrently received signals into a separate one of three paths; means responsive to input signals on a first, second and third path from the demodulating means for time expanding each of the three input signals by an amount equivalent to that used by a remote transmitter in originally time compressing each of said three input signals; means capable of converting the first and second differential signals into associated separate recovered ones of the television picture signals, and retaining said one of the television picture signals as is as a separate recovered one of the three television picture signals; and means for routing the first, second and third ones of the television signals at the output of the converting means to a predetermined television terminal in a proper sequence. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
Specification