Audio frequency multiplication device

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system


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381 40, G10L 500




A signal processing device for frequency multiplication of an analog signal by an adjustable multiplication factor. The input analog signal is digitized using a delta modulator and read into a random access memory at a first clock rate. The data is read out of the memory at second clock rate and then converted back to an analog output signal. The multiplication factor is a function of the adjustable ratio of the two clock rates.

patent: 3816664 (1974-06-01), Koch
patent: 4053712 (1977-10-01), Reindl
patent: 4091242 (1978-05-01), Carrubba et al.
patent: 4370524 (1983-01-01), Hiraguri
Specifications Continuously Variable Slope Delta Modulator/Demodulator, Motorola MC3417.
VSC: Variable Speech Control M8 Module.


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