单词 | sound-powered telephone |
释义 | sound-powered telephone [`sau̇nd ¦pau̇·ǝrd `tel·ǝ´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. |
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