Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Patent
1995-09-05
1998-05-26
Olms, Douglas W.
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
370484, 370498, 375371, H04J 304
Patent
active
057578079
ABSTRACT:
This invention relates to methods and apparatus for extracting data of a channel from and for inserting low speed input data into a channel of time division bit multiplex. An optical data transmission system is used for distribution of video signals or information services. A variable frequency divider generates a timing signal by frequency dividing a clock signal by N. The resulting timing signal is phase shifted by M clock periods by inserting one cycle of 1/(N+M) frequency dividing in accordance with a synchronous command signal. With the timing signal, data of a channel is extracted from the time division multiplexed data of N channels by an extracting circuit, such as a D-type flip-flop. With a synchronous signal generated from the timing signal having the same pulse width of the multiplexed data, a low speed input data is inserted into a channel of the multiplexed data of N channels by a selector.
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Suzaki Tetsuyuki
Tezuka Hiroshi
Hom Shick
NEC Corporation
Olms Douglas W.
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