Intrinsically safe audio circuit for a portable two-way radio

An intrinsically safe audio circuit and intrinsically safe portable two-way radio device meet conventional audio output requirements and intrinsically safe design limitations by separating the speaker coil of the device's speaker into separate coils to limit the energy storage possible in any o...

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Bibliographische Detailangaben
Hauptverfasser:	SVENDSEN PETER WILLIAM HILDING, TAN CHEAH HENG, BOLLMANN FRIEDRICH J, SAW TEIK SENG, TEH KHENG SHIANG
Format:	Patent
Sprache:	eng
Schlagworte:	CINEMATOGRAPHY DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY ELECTROPHOTOGRAPHY HOLOGRAPHY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MAGNETOGRAPHY PHOTOGRAPHY PHYSICS PUBLIC ADDRESS SYSTEMS
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Beschreibung
Zusammenfassung:	An intrinsically safe audio circuit and intrinsically safe portable two-way radio device meet conventional audio output requirements and intrinsically safe design limitations by separating the speaker coil of the device's speaker into separate coils to limit the energy storage possible in any one of the coils. Each separate coil is driven by one of several different audio power amplifiers that each output a substantially identical signal, and each of which are current limited.