Audio frequency multiplication device

Details Audio frequency multiplication device Audio frequency multiplication device

1985-07-19

1986-12-02

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 40, G10L 500

Patent

active

046270906

ABSTRACT:
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.

REFERENCES:
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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