Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1998-04-17
1999-12-07
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
348608, 348607, 348726, H04L 2728, H04L 512, H04L 2302
Patent
active
059995696
ABSTRACT:
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 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, 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.
REFERENCES:
patent: 5086340 (1992-02-01), Citta et al.
patent: 5087975 (1992-02-01), Citta et al.
patent: 5105442 (1992-04-01), Wei
patent: 5142353 (1992-08-01), Kageyama et al.
patent: 5398073 (1995-03-01), Wei
patent: 5452015 (1995-09-01), Hulyalker
patent: 5565932 (1996-10-01), Citta et al.
Chin Stephen
Matsushita Electric - Industrial Co., Ltd.
Roundtree Joseph
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