Pulse or digital communications – Repeaters – Testing
Patent
1986-02-06
1989-06-27
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
332 9R, 332 16R, 375 62, 375 67, H04L 2720
Patent
active
048436135
ABSTRACT:
A digitally implemented modulator for generating samples of a band-limited modulated output signal from an inputted binary data signal made up of a train of sets of data bits. Samples values are stored in look-up tables incorporated in a microprocessor. The look-up tables are accessed by forming an address for each of three sets of data bits in a sequence. Each address is dependent on the binary values of the data bits of the respective set of inputted binary data and on the number of samples formed since the start of the pending band interval. A predetermined number of samples are generated per set of inputted binary data. The respective sample values stored in the look-up tables at the three addresses formed are summed to form the sample of the band-limited modulated output signal.
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"Microprocessor Implementation of High-Speed Data Modems", IEEE Trans. Commun., vol. No. 2, 1977.
Published Internationl Patent Application, WO/85/0025, Wolfdata, Inc., Published Jan. 17, 1985.
Published Internationl Patent Application, WO/81/00334, Western Electric Company Inc., Published, Feb. 5, 1981.
Digital Equipment Corporation
Meller Michael N.
Safourek Benedict V.
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