DRIVING CIRCUIT FOR LOUDSPEAKER

PURPOSE:To make the loudspeaker nondirectional and to miniaturize it by reproducing a voice input by a minute spark discharge sound source of a discharge electrode gap. CONSTITUTION:A PCM-PAM converting part 1 converts a PCM signal Sin to a PAM signal Spa from an analog sound signal being an origina...

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Bibliographic Details
Main Author HIRANO TOSHIHIRO
Format Patent
LanguageEnglish
Published 19.11.1990
Subjects
DEAF-AID SETS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS
PUBLIC ADDRESS SYSTEMS
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Summary:PURPOSE:To make the loudspeaker nondirectional and to miniaturize it by reproducing a voice input by a minute spark discharge sound source of a discharge electrode gap. CONSTITUTION:A PCM-PAM converting part 1 converts a PCM signal Sin to a PAM signal Spa from an analog sound signal being an original signal, and a PAM signal bias part 2 applies a DC component of prescribed amplitude to the PAM signal Spa from the PCM-PAM converting part 1, and brings it to level shift so as to have amplitude of one of positive or negative. A PAM signal amplifying part 3 amplifies the PAM signal from the PAM signal bias part 2, charges a capacitor C, and a switch part 4 is a switch connected between the PAM signal amplifying part 3 and a loudspeaker 5, and executes charge and discharge to the capacitor C. In such a way, the loudspeaker becomes nondirectional, and can be miniaturized.
Bibliography:Application Number: JP19890101712