Pulse or digital communications – Repeaters – Testing
Patent
1983-11-03
1986-03-25
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
375 45, 375 52, 375 56, H04B 138, H04L 516, H04L 2710, H04L 2718
Patent
active
045787964
ABSTRACT:
A digital processor based voiceband modem that provides computers and terminals access to telephone lines and performs line control functions to originate, answer and terminate data calls in addition to converting baseband signals to voiceband and voiceband signals to baseband. The modem utilizes a signal processor that executes various signal converting algorithms under control of selected sets of instructions and further utilizes a digital processor that executes line control algorithms for alternative modes (i.e., originate or answer) of the data modem. An outgoing or incoming call enables the appropriate mode and, during the execution of the corresponding line control algorithm, various sets of instructions are selected to execute signal converting algorithms appropriate for the enabled mode of a specific one of various data modem types.
REFERENCES:
patent: 3699525 (1972-10-01), Klavins
patent: 3958191 (1976-05-01), Jones, Jr.
patent: 4085449 (1978-04-01), Walsh et al.
patent: 4263670 (1981-04-01), Sherman
patent: 4425664 (1984-01-01), Sherman et al.
"Voiceband Modem Implementation Techniques for Programmable Digital Signal Processors" by J. A. Iapicco and S. P. Verma, published in Records of the International Conf. on Comm., pp. 72.2.1-72.2.6.
Charalambous Salomi T.
Horvath Mark P.
House Cathy P.
Iapicco Jeffrey A.
Lue Paul D.
AT&T Information Systems Inc.
Bell Telephone Laboratories Incorporated
Chin Wellington
Olms Douglas W.
Slusky Ronald D.
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