sound-powered telephone

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sound-powered telephone

[′sau̇nd ¦pau̇·ərd ′tel·ə‚fōn]
(engineering acoustics)
A telephone operating entirely on current generated by the speaker's voice, with no external power supply; sound waves cause a diaphragm to move a coil back and forth between the poles of a powerful but small permanent magnet, generating the required audio-frequency voltage in the coil.
References in periodicals archive ?
Limited Tenders are invited for Sound Powered Telephone System For Grse Yard Nos 2113 17 Fpv Project
The ICS provides functionality for telephony, intercoms, broadcast announcing and alarms, sound powered telephone networks, and wireless communications.
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