Digital modulation apparatus

Details Digital modulation apparatus Digital modulation apparatus

1986-04-10

1987-07-14

Laroche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 21, 375 67, H03C 300

Patent

active

046805567

ABSTRACT:
A quadrature phase modulator constructed by use of a simple digital circuit. Digital signals of sample data obtained by sampling outputs from a roll-off filter with a frequency four times a modulated carrier frequency are stored in an ROM, the outputs corresponding to all combinations of a plurality of successive bits of input data; the plurality of bits are set as an address, and a signal of an in-phase channel and a signal of a quadrature phase channel is alternately read from the ROM with a frequency equal to half the sampling frequency, then the obtained serial signals are subjected to a digital-to-analog conversion to obtain a quadrature phase modulated signal.

REFERENCES:
patent: 4584541 (1986-04-01), Nossen

Affiliated with

Also associated with

Rating

Digital modulation apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital modulation apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital modulation apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1429998