Miniature device for receiving and playing back sound with piezoelectric component as combination microphone/loud speaker
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United States of America Patent
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Feb 22, 2000
Issued Date -
N/A
app pub date -
Aug 14, 1997
filing date -
Jun 22, 1992
priority date (Note) -
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Abstract
Sound recording and playback device comprising a sound pick-up microphone connected to a recording channel and a playback loudspeaker connected to a channel for playing the recorded sounds, characterised in that the microphone and the loudspeaker consist of one and the same component (5).
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