Multiplex communications – Wide area network – Packet switching
Patent
1979-06-22
1980-12-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 7, 370118, H04J 316
Patent
active
042375525
ABSTRACT:
In a digital time division multiplexed telephone transmission system, a plurality of telephone signals are cyclically sampled and quantized so that each sampled value may be encoded into a binary codeword of a preset number of bits and that a series of codewords equal in number to the telephone signals may constitute a frame and a series of a predetermined number frames may in turn constitute a superframe. At the transmission end, an input circuit (202) receives the time division multiplexed telephone signals, and a code converter (204) coupled to the input circuit and responsive to a state-representing signal successively converts each of the binary codewords into a plurality of modified codewords. The modified codewords are variably assigned comparatively smaller and greater numbers of binary digits depending on the state-representing signal, the comparatively greater number being equal to or smaller than the preset number. A selection circuit (207) is supplied with the modified codewords and selectively allows one of the modified codewords to pass. A bit-number-assigning circuit (205) is coupled to the code converter and responsive to the output of the selection circuit to produce the state-representing signal in response to the corresponding one of at least one preceding frame, and for each of the modified codewords, the bit-number-assigning circuit produces a bit-number-representing signal indicating the number of bits assigned to the binary codeword being transmitted. A multiplexer (206) is coupled to the bit-number-assigning circuit and arranges in time domain the output of the selection circuit, bit-number-representing signal and a superframe synchronization signal. At the reception end, a code-inverse converter (1003) is responsive to the bit-number-representing signal to reproduce the binary codewords from the modified codewords.
REFERENCES:
patent: 3447147 (1969-05-01), Deregnaucourt
patent: 3711650 (1973-01-01), Kuhn et al.
patent: 3773971 (1973-11-01), Sainte-Beuve
patent: 4002841 (1977-01-01), Ching et al.
patent: 4005274 (1977-01-01), Vagliani et al.
patent: 4012595 (1977-03-01), Ota
patent: 4039948 (1977-08-01), Boxall
patent: 4100377 (1978-07-01), Flanagan
Aikoh Shinichi
Niwa Kunihiko
Tomozawa Atsushi
Nippon Electric Co. Ltd.
Olms Douglas W.
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