Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1987-03-02
1988-08-02
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
370 49, 375121, H04L 2540
Patent
active
047618000
ABSTRACT:
An asynchronous interface for coupling data between a terminal and a data module is provided. The asynchronous interface directly determines and matches to the rate of serial data being transmitted by the terminal and received by the data module with minimal involvement of a processor associated with the data module. The asynchronous interface determines the rate of the data being transmitted by configuring counting circuitry therein for measuring the period of the start bit in the first received character whenever the speed of data being transmitted by the terminal must be determined. The asynchronous interface then adjusts to the newly determined data rate and receives the remaining bits in the first character and subsequent characters at the new rate. The processor is involved only to request that the asynchronous interface determine the incoming data rate and match to it and, once the data rate has been determined and matched, to process the recovered characters and this new rate. While the asynchronous interface determines and matches to the incoming data rate, the processor is freed for other tasks.
REFERENCES:
patent: 4001504 (1977-01-01), Hendrickson
patent: 4101732 (1978-07-01), Suzuki
patent: 4210777 (1980-07-01), Bowerman et al.
Book: McNamara, John E., Technical Aspects of Data Communication, Medford, MA: Digital Equipment Corporation, 1977, pp. 11-15; 335-341.
Lese Gregory
Price John D.
Richardson Ralph E.
Than Cu T.
Vancura Mark D.
American Telephone and Telegraph Company AT&T Bell Laboratories
AT&T Information Systems Inc.
Safourek Benedict V.
Williamson Samuel R.
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