Method and apparatus for synthesizing a modulated carrier to red

Details Method and apparatus for synthesizing a modulated carrier to red Method and apparatus for synthesizing a modulated carrier to red

1979-12-26

1981-12-22

Ng, Jin F.

Pulse or digital communications

Repeaters

Testing

332 16R, H04L 2720

Patent

active

043074642

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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patent: 3973087 (1976-08-01), Fong
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patent: 4100369 (1978-07-01), Stenstrom et al.
patent: 4101834 (1978-07-01), Stutt et al.
patent: 4109204 (1978-08-01), Kincaid
patent: 4135181 (1979-01-01), Bogacki et al.
patent: 4161720 (1979-07-01), Bogacki

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