Digital apparatus and method for programmably phase shifting an

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

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307262, 328155, 331 16, 331 25, 332 19, 381 97, H03K 5135, H03L 708

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046267964

ABSTRACT:
Apparatus and method for programmably phase shifting an audio tone is disclosed for use in a cellular communications system. A digital phase lock loop (PLL) includes a programmable phase shift therewithin and an audio output, phase-shifted from an input audio tone, is extracted from the thus programmed PLL. The apparatus of the present invention is particularly designed to be realized using digital circuits capable of integration into a monolithic CMOS IC.

REFERENCES:
patent: 4021757 (1977-05-01), Nossen
patent: 4543542 (1985-09-01), Owen

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