Patent
Data communication system having a speed setting variable with transmission quality factors
Hashimoto Shinji
- 18 Dec 1989
79
TL;DR: In this article, a full-duplex data communication system is considered, where the signal-to-noise ratio, error rate and occurrences of out-of-sync condition of signals transmitted on the data channel of a first transmission medium from a first station to a second station are detected by the latter.
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Abstract: In a full-duplex data communication system, the signal-to-noise ratio, error rate and occurrences of out-of-sync condition of signals transmitted on the data channel of a first transmission medium from a first station to a second station are detected by the latter and a first set of quality signals of the first transmission medium is generated. The signal-to-noise ratio, error rate and occurrences of out-of-sync condition of signals transmitted on the data channel of a second transmission medium in the opposite direction are likewise detected by the first station and a second set of quality signals of the second transmission medium are generated. The first set of quality signals are modulated and transmitted on a control channel of the second transmission medium from the second station and received and demodulated by the first station, which derives a speed setting command signal from the second set of quality signals as well as from the first set of quality signals represented by the demodulated signals, and the transmission speed of the first station is controlled according to the speed setting command signal. The speed setting command signal is modulated and transmitted on a control channel of the first transmission medium from the first to second station, which demodulates it and controls its transmission speed according to the demodulated speed setting command signal.
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Citations
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Patent
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TL;DR: In this paper, the quality of the channel is monitored, a communication rate is selected based on the channel quality, the desire for an increased rate is indicated, and the increased rate can be implemented by the modem when the remote device concurs.
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TL;DR: In this paper, an adaptive digital multiplexer including a multiplex format computer, a time slot generator, and a combiner is used to adapt the multiplexed output to a reduced transmission rate of increased bit duration by progressively eliminating transmission of lower priority signals.
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Patent
Data communication system
Morifumi Okugawa,Iegi Toshiatsu,Fumihiro Kimura,Yamaguchi Tomoo,Makoto Shibuya +4 more
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TL;DR: In this article, the authors proposed to attain quick data communication by sending constitution section addition information identifying each constitution section via a communication line together with data information so as to relieve the operating load of a control section.
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Patent
Data communication system
Tsuneo Negi
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TL;DR: In this paper, a test signal is received for testing the transmission rate, the number of errors in the test signal in a predetermined time period is detected, and the error is compared with a predetermined number to determine the proper transmission rate for data communication.
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Patent
Digital data transmission system with a variable transmission rate
Herbert Sullivan
- 25 Apr 1969
22
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