Digital circuit with band limiting characteristics for modem

Details Digital circuit with band limiting characteristics for modem Digital circuit with band limiting characteristics for modem

1986-02-21

1988-05-31

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 42, 375 45, 328 14, 328 27, 332 16R, H03B 2800, H03K 706, H04L 2710

Patent

active

047486406

ABSTRACT:
The input digital signal is applied to a transition detector which causes an up/down counter to increment or decrement each time a transition is detected. The output of the counter is utilized to address a read only memory (ROM) which, in turn, generates binary words representing first and second integers. These binary words are used to control a programmable divider to generate an output having a frequency which moves between two values corresponding to the digital input. The rate at which the frequency changes between the two values is controlled by the ROM contents. In the implementation, the frequency changes with a raised cosine shape.

REFERENCES:
patent: 3641566 (1972-02-01), Konrad et al.
patent: 3657657 (1972-04-01), Jefferson
patent: 3792378 (1974-02-01), Hughes et al.
patent: 3997855 (1976-12-01), Nash
patent: 4484296 (1984-11-01), Treise et al.
patent: 4596022 (1986-06-01), Stoner
patent: 4656428 (1987-04-01), Isikawa

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