Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone
Patent
1983-06-14
1985-09-10
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With electrostatic microphone
330127, 363 20, 381120, 381122, H04R 300, H04K 1704, H02M 3335
Patent
active
045411123
ABSTRACT:
An electroacoustic transducer system comprises a microphone working into a low-frequency amplifier for the energization of an a-c load such as, for example, a loudspeaker or a volume indicator at a control panel. Biasing voltage for the microphone and operating current for the amplifier are derived from a d-c source, via a phantom circuit including the output leads of the amplifier and through a coupler in cascade with a chopper; the latter includes a transistor conducting intermittently under the control of an adjustable pulse generator whose pulse width is varied by negative feedback from the integrated chopper output. An output transformer with a primary in series with the transistor has several secondaries each connected across a storage capacitor through a diode for the generation of a relatively high biasing voltage for the microphone, a relatively low driving voltage for the amplifier and, possibly, a further voltage used to vary the directional pattern of the microphone. To facilitate the establishment of different voltage levels, the development of the lower voltage is delayed--by the combination of a choke with a Zener diode, or by a thyristor--until the higher voltage has been reached by a transient occurring at the beginning of each cutoff phase.
REFERENCES:
patent: 3422225 (1969-01-01), Griese
Byrd Danita R.
Dubno Herbert
Georg Neumann GmbH
Ross Karl F.
Rubinson Gene Z.
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