Arrangement for controlling the amplitude of an electric signal

Details Arrangement for controlling the amplitude of an electric signal Arrangement for controlling the amplitude of an electric signal

1988-08-12

1990-02-20

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 30, 375 22, G10L 500

Patent

active

049033026

ABSTRACT:
In a digital system for amplitude modulation, the logical signal at acoustic frequency is modulated by means of an ultrasonic frequency signal, the duty-cycle of which can be varied by means of a program. More particularly, the modulating signal is generated by a cyclic counter. The duty-cycle is programmed by writing the corresponding numerical value to a register with a capacity equal to that of the counter. An adder, adding the value of the counter each time to that of the register, generates a carry signal which gives consent to the acoustic signal only for a part of the relative cycle of the modulating signal.

REFERENCES:
patent: 4270027 (1981-05-01), Agrawal et al.
patent: 4754466 (1988-06-01), McCambridge
patent: 4776036 (1988-10-01), Hulsey et al.

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