| 摘要 |
An oral warning system for monitoring mining operations, or the like, comprising a plurality of first sensors each providing a signal representative of an abnormal condition being sensed, at least one additional sensor providing a signal representing an emergency condition being sensed, an oscillator and modulator for generating an emergency warning tone energized upon detection of the emergency condition, a plurality of speakers at selected locations for broadcasting the emergency warning tone, a multi-track tape player with playback head selectively movable to any one of the track positions and having an audio output connected to local and remote speakers, and circuit means effective to energize the tape player and move its head to an appropriate track containing a prerecorded oral message upon detection of an abnormal condition by one of said first sensors. Preferably, the system includes means for stopping a mine belt near the locality of the emergency condition and operated by the additional emergency sensor, and a first sensor at the same location detects such belt stoppage so that in addition to the broadcast of the emergency warning tone, the tape player is activated to broadcast a verbal description of the type of emergency and its location.
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