Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic loudspeaker
Patent
1987-07-01
1989-01-17
Isen, Forester W.
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With electrostatic loudspeaker
381191, H04R 300
Patent
active
047992654
ABSTRACT:
A device for converting an electric signal into an acoustic signal comprises an input terminal (1) for receiving an electric signal, an amplifier unit comprising N sub-amplifiers (13,15), and a transducer unit comprising N electrostatic transducers (2,3). The diaphragm (3,8) of the N electrostatic transducers forms part of a diaphragm which is common to all transducers. The input terminal (1) is coupled to the input (6) of the first transducer (2) via a first subamplifier (13). Further, the input terminal (1) is coupled to the input (11) of the (i+1)th transducer, i ranging from 1 to N-1 inclusive, via a series arrangement of an i-th low-pass filter (14) and an (i+1)th sub-amplifier (15) (in that order). The sub-amplifier is moreover of the feedback type. Further, for N>2 a low-pass filter having a higher sequence number i has a lower cut-off frequency.
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Franzblau Bernard
Isen Forester W.
U.S. Philips Corporation
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