Complex analog waveform generator

Details Complex analog waveform generator Complex analog waveform generator

1975-02-27

1976-04-20

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

23515053, 328 14, G06F 1534, G06G 728

Patent

active

039521893

ABSTRACT:
A signal generator digitally synthesizes a complex analog signal which has a frequency domain representation including a precise low-frequency offset for each spectral component. The complex analog signal is particularly adapted to increase the accuracy and reliability of a conventional ratio measurement technique. This ratio measurement technique provides a single number rating which is the comprehensive measure of the fidelity of a transmission channel. The complex analog signal is thoroughly compensated for a number of effects. The transfer response of filters and fundamental sources of spectral distortion inherent to digital synthesis, such as aperture effect and quantizing distortion, are items for which compensation is provided. The signal generator has complementary circuitry which conveniently assists to provide desirable odd half-wave symmetry in the analog signal and reduces by one-half the number of stored code words from which the signal is derived.

REFERENCES:
patent: 3529138 (1970-09-01), Andre et al.
patent: 3544906 (1970-12-01), Dulaney et al.
patent: 3654450 (1972-04-01), Webb
patent: 3801807 (1974-04-01), Condon
patent: 3838414 (1974-09-01), Wiles
patent: 3845395 (1974-10-01), Murphree

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