| 摘要 |
For sleep promotion and for sleeper awakening an audio system including a wide band audio frequency generator is provided with an output speaker, volume and tone selectors, a time-alarm signalling system, and means for connection with a house alarm system to sound the time-alarm when the house alarm system is actuated; operation is suspended when the alarm system is actuated for any reason; volume control in response to ambient noise is also provided.
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