Method and apparatus for synthesizing a modulated carrier to reduced interchannel interference in a digital communication system
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United States of America Patent
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Dec 22, 1981
Grant Date -
N/A
app pub date -
Dec 26, 1979
filing date -
Dec 26, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The modulated carrier in a frequency-multiplexed digital communications system is synthesized with each band of the modulated carrier derived from data stored in a read-only-memory. The carrier envelope shape is selected to reduce the sidebands of the digitally modulated carrier and thus reduce interchannel interference. The read-only-memory digital output is applied to a digital-to-analog converter for synthesis of an analog voltage, representing the modulated sinusoidal carrier, having reduced higher frequency content, without the necessity for use of a costly, narrow-bandpass filter.
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