| 摘要 |
A telephone contains a loudness indicator to assist persons hard of hearing in speaking into the telephone receiver at a moderate level. The indicator contains a microphone, which detects the level of the user's speech. An electronic circuit conditions the microphone output, and outputs one of three signals, depending upon the level of the microphone output. The first signal is output when the speaker speaks at the usual level, driving a first indicator light, which is colored green, to indicate a "go" to the user, that is, increase the level of speech. The second signal is output when the microphone output is slightly above the normal range, and the corresponding indicator light is colored yellow to so indicate. The third signal is output when the microphone output is of a level which far exceeds the normal range of speech. The corresponding indicator light is red, to indicate a "stop" to the user. The device may be built into the handset, and operated by the power available within the handset. Alternatively, the device may be incorporated in an add-on module, which is battery operated, and affixed to the handset by a hook and loop connector. The colored lights are located near the speaker end of the handset, so that the user may see the lights using his peripheral vision, while holding the handset in its normal position.
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