Pulse or digital communications – Repeaters – Testing
Patent
1983-06-13
1984-06-19
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375121, 179 3, 364200, 364900, H04B 138
Patent
active
044556616
ABSTRACT:
Modem apparatus in which a modulated carrier signal represents digital bits, wherein the apparatus includes first digital processing circuitry having first programmable digital circuitry for arithmetic manipulation of digital values in accordance with selectable arithmetic program instructions to produce a correspondence between a sequence of signal values at a rate of 1/T signal values per second and a sequence of samples at a rate higher than 1/T samples per second representing the modulated carrier signal, where T represents the duration of a modulation period of the carrier signal, first bus circuitry connected to the first programmable digital circuitry for carrying the digital values and the arithmetic program instructions, and first memory circuitry connected to the first bus circuitry for storing the instructions, digital values, and signal values; second digital processing circuitry comprising second programmable digital circuitry for generating control signals corresponding to predetermined sequences of the arithmetic instructions, second bus circuitry connected to the second programmable circuitry for carrying the control signals, and second memory circuitry connected to the second bus circuitry for storing control signal program instructions; timing circuitry for timing the operation of the first and second processing circuitries, and means for providing a sequence of time-limited handshakes between the first and second processing circuitries, during which the control signals are transferred to the first processing circuitry to cause the first programmable digital circuitry to carry out the predetermined sequences of the arithmetic instructions.
REFERENCES:
patent: 3889237 (1975-06-01), Alferness
patent: 3902165 (1975-08-01), Artom
patent: 3908169 (1975-09-01), Tong
patent: 4071827 (1978-01-01), Koike
patent: 4085449 (1978-04-01), Walsh et al.
patent: 4181936 (1980-01-01), Kober
Bulyanov et al., "Digital Modems For VF Channels", Dec. 1978, Telecommunication & Radio Eng. Part, (USA), pp. 29-33.
Chin Stephen
Codex Corporation
Griffin Robert L.
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