Pulse or digital communications – Repeaters – Testing
Patent
1985-07-16
1987-06-09
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
332 16R, 455110, H03C 304
Patent
active
046726349
ABSTRACT:
An arrangement for generating an analog angle-modulated carrier signal of a substantially constant amplitude in response to data signals having a symbol rate 1/T comprises a read-only memory for storing modulation parameters, an addressing circuit responsive to a predetermined number of consecutive data symbols for producing read addresses with a rate q/T, where q is an integer greater than 1, and a signal processor for processing read values to form the analog angle-modulated signal. An arrangement having a predominantly digital structure which does not utilize a DAC circuit as an interface between digital and analog sections of the signal processor is obtained in that the signal processor incorporates a zero-crossing generator comprising a delay circuit responsive to a numerical time-setting signal a set pulse having a presettable time delay of at most T/q, a gate circuit only responsive to a zero-crossing indication signal for transferring the set pulse to a bistable pulse generator, which produces a two-level signal whose level transitions only occur at the instants of the transferred setting pulses, and a bandpass filter having a centre frequency equal to the carrier frequency. These measures result in an arrangement which is capable of processing a wide range of data symbol rates 1/T and which is particularly suitable for monolithic integration.
REFERENCES:
patent: 3935386 (1976-01-01), Glasson et al.
patent: 4229821 (1980-10-01), de Jager et al.
patent: 4327439 (1982-04-01), Gockler et al.
Boschma Klaas M.
Chung Kah-Seng
Barschall Anne E.
Rich Marianne
Safourek Benedict V.
Streeter William J.
U.S. Philips Corporation
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