Method and apparatus for communication and signal synthesis

Details Method and apparatus for communication and signal synthesis Method and apparatus for communication and signal synthesis

1995-09-21

2000-11-28

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 71, 455118, 455315, H04B 140, H04B 126, H01Q 1112

Patent

active

061546402

ABSTRACT:
In a receiving and transmitting apparatus, a frequency of a direct digital synthesizer provided in a local oscillating circuit is controlled in order to reduce a frequency error, based on data of a frequency error detecting circuit. The direct digital synthesizer includes a digital operation circuit for inputting data designating the frequency and outputting an amplitude value of a periodic signal synchronous with a reference clock, and digital-analog converter for converting the amplitude value of the periodic signal to an analog signal.

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