| 摘要 |
A headphone sound system apparatus includes headphones and a sound system having an output line for the headphones for producing audio signals to the headphones. The sound recognition and interrupt system has the sound system output coupled thereto and to the headphones and has a housing which can be attached to the person, such as being clipped to a belt. The housing has a microphone mounted inside for picking up sounds extraneous to the sound system and a switching circuit mounted in the housing and connected to the microphone and which is actuated by the microphone between on and off positions responsive to signals of predetermined levels being generated by the microphone. The switching circuit disables the connection from the sound source so that a person wearing the headphones has the sound system turned down to thereby be able to hear the extraneous sound that actuated the switching circuit. The switching circuit is manually actuated to reconnect the sound source to the headphones. The switching circuit includes a transistor switch and an SCR latching circuit and is such that any headphones or sound system, such as a portable CD player, can be plugged into the sound recognition and interrupt system.
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