Crescendo control of signalling devices

Details Crescendo control of signalling devices Crescendo control of signalling devices

H - Electricity

04

M

379/18, 84/1.1

H04M 3/02 (2006.01) H04M 19/04 (2006.01)

Patent

CA 1051569

ABSTRACT OF THE DISCLOSURE A signalling circuit including an electrical to acoustic transducer which is sequentially energized by a pulsatile ringing source includes a potentiometer in series between the source and transducer. The potentiometer is continually decreased in resistance as source pulsations continue to that each successive acoustic output is of increased intensity. The wiper of the potentiometer is a needle of a meter movement and the fixed resistance of the potentiometer as arcuate and positioned in place of a meter scale. A passive quasi-integrator circuit is coupled between the source and the input to the meter movement for pro- ducing a generally increasing signal for advancing the wiper along the resistance.

247903

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