Improvements in or relating to signal converters

1,125,597. Microphone, pulse modulation and transistor amplifying circuits. STANDARD TELEPHONES & CABLES Ltd. 17 Dec., 1965, No.53620/65. Headings H3T, H4J and H4T. A condenser microphone controls a time constant in a free-running multivibrator circuit including transistors, T1, T2 to vary the m...

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Hauptverfasser:	CRAGG WILLIAM DONALD, BRAMER TERRENCE PATRICK CONWAY
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS PULSE TECHNIQUE
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Zusammenfassung:	1,125,597. Microphone, pulse modulation and transistor amplifying circuits. STANDARD TELEPHONES & CABLES Ltd. 17 Dec., 1965, No.53620/65. Headings H3T, H4J and H4T. A condenser microphone controls a time constant in a free-running multivibrator circuit including transistors, T1, T2 to vary the markspace ratio of the output pulses. The-microphone is of the push-pull type so that excitation of the microphone changes the capacitance of C1 and C2 in opposite senses. The output of the multivibrator is fed to an integrating circuit RC. Alternatively, the width-modulated pulses may be amplified and transmitted in pulse form before integration.