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A hardware multitone digital frequency synthesizer

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3 Author(s)
Wittman, B. ; Bell Laboratories, Indianapolis, IN ; Early, S. ; Messerschmitt, D.G.

The synthesis of two or more tones simultaneously has numerous applications, including telephone signaling, music synthesis, waveform generation, and man-machine communications. We describe a hardware approach in which the basic tones are generated digitally for accuracy and stability, using time-shared circuitry. The tones are combined and their levels are controlled by an analog approach using a pair of D/A converters, avoiding digital multipliers and adders. Performance and description of a hardware prototype are given.

Published in:

Acoustics, Speech and Signal Processing, IEEE Transactions on  (Volume:27 ,  Issue: 6 )

Date of Publication:

Dec 1979

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