Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-12-28
1991-11-05
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
370 581, 3701001, 375119, H04L 704
Patent
active
050635760
ABSTRACT:
An asynchronous data signal coding and decoding method and implementing apparatus in which data signals, each with a corresponding data timing signal, of a plurality of channels and a plurality of bit rates are supplied to respective input interface circuits. The input interface circuits phase-compare the data timing signals to a reference timing signal of the same frequency, and the thus-obtained phase difference is stored in a first switch circuit for each period of the data timing signal. The corresponding input data signals are processed and synchronized with the reference timing signal and stored in a second switching circuit. Then, the data timing signal is reproduced by using the reference timing signal and the phase difference data. The input data signals, stored in the second switch circuit, are synchronized with the reproduced data timing signals, resulting in a drastic reduction in the quantity of processed data.
REFERENCES:
patent: 4088832 (1978-05-01), Eastmond
patent: 4546486 (1985-10-01), Evans
patent: 4635277 (1987-01-01), Blake et al.
patent: 4819251 (1989-04-01), Nelson
Eguchi Mikiro
Sato Hideto
NEC Corporation
Safourek Benedict V.
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