Mixed dual frequency generating system

Details Mixed dual frequency generating system Mixed dual frequency generating system

1984-11-15

1986-07-08

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

328 14, 332 16R, 375 45, 375 62, 364721, H03B 2800, H04L 2712

Patent

active

045995834

ABSTRACT:
A mixed dual frequency generating system for generating a digital FSK signal or a signal including two mixed frequencies includes a ROM which stores in consecutive addresses sampled data obtained by sampling a sine wave at a sampling frequency. The mixed dual frequency generating system also includes a data extracting circuit for extracting the sampled data from the ROM at the sampling frequency using an extracting step number. An output data fixing circuit changes alternate data extracted from the ROM to data "O", so that a signal having two mixed frequencies can be obtained.

REFERENCES:
patent: 4346448 (1982-08-01), Insam et al.
patent: 4482974 (1984-11-01), Kovalick
Wittman et al, "A Hardware Multitone Digital Frequency Synthesizer", IEEE Trans. on Acoustics, Speech, and Signal Processing, vol. ASSP-27, Dec. 1979, pp. 804-809.
Multrier, "Tone Generator", IBM Technical Disclosure Bulletin, vol. 20, No. 12, May 1978, p. 5196.

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