Modulator for hybrid modulation by more and less significant dig

Details Modulator for hybrid modulation by more and less significant dig Modulator for hybrid modulation by more and less significant dig

1974-08-27

1976-09-14

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325 41, 329105, 329122, 332 23A, 332 40, 332 41, H03C 102

Patent

active

039809714

ABSTRACT:
A modulator for quadrature amplitude modulating a carrier signal by a first and a second signal derived from an input analog signal includes an A/D converter for converting the input signal to a digital signal in each clock interval and a circuit for producing an error signal representative of quantization errors of the digital signal in the respective clock intervals. The modulator comprises means for dividing the digital signal into a more and a less significant signal comprising more significant and the remaining digits of the digital signal, means for producing the first signal by arranging the more and less significant signals in succession in each clock interval, and a selectively operable inverter for producing the second signal by arranging the error signal in succession in each clock interval with the error signal left as it is and with its polarity inverted.

REFERENCES:
patent: 3497625 (1970-02-01), Hileman et al.
patent: 3603725 (1971-09-01), Cutler
patent: 3800228 (1974-03-01), Acker

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