Impulse detection circuit

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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Details

307350, 307351, 307358, 328114, 328117, H03K 5153

Patent

active

049394711

ABSTRACT:
An impulse detection circuit for use in triggering circuits such as those used for detecting drum beats within background noise and then triggering music synthesizers in response to the drum beat. Differentiators and peak-rectifiers and filters are used to detect impulse like inputs over a wide dynamic range in a noisy background. The input signal is rectified and differentiated and then inputted into a peak-rectifier and filter having a fast charging and a slow discharging time constant. The output of this peak-rectifier and filter is differentiated and inputted into a pair-rectifier and filters operating in parallel, which filters have rapid charging and slow discharging time constants. The time constants of one of the two filters are approximately twice those of the other. The outputs of the two peak-rectifier and filters are compared in a comparator. Because of the differences in the time constants of the two filters, the comparator produces a pulse output in response to each impulse that is input to the circuit of the invention.

REFERENCES:
patent: 4358738 (1982-11-01), Kahn
patent: 4362996 (1982-11-01), Priebe
patent: 4468625 (1984-08-01), Tandart et al.
patent: 4507578 (1985-03-01), Matsuda
patent: 4507795 (1985-03-01), Wagner
patent: 4637003 (1987-01-01), Yokogawa

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