0506400-A2 is referenced by 80 patents and cites 7 patents.

At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between the first and second data streams is developed by shifting the signal points to other positions in the space diagram. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into two, low and high, frequency band components which are designated as a first and a second data stream respectively.; Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability.

Title
Signal transmission system.
Application Number
EP19920302627 19920326
Publication Number
0506400 (A2)
Application Date
March 26, 1992
Publication Date
September 30, 1992
Inventor
Oshima Mitsuaki Katsura
JP
Assignee
Matsushita Electric
JP
IPC
H04N 07/13
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H04N 07/08
H04N 07/04
H04L 27/34
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H04N 07/26
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H04N 07/015
H04N 05/44
H04L 27/38
H04L 27/34
H04L 27/26
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H04N 07/54
H04N 07/26
H04N 07/24
H04N 07/20
H04N 07/045
H04N 07/015
H04N 05/44
H04L 27/38
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H04L 27/34
H04L 27/26
H04L 27/18
H04L 27/02
H04L 01/00
H04J 11/00
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