| 摘要 |
<p>A novelty device (100) includes a sound-activated circuit. The sound-activated circuit includes an audio storage device (220) that stores a recorded message (310). A transducer (210) connected with the audio storage device (220) outputs the recorded message (310) when the circuit receives an external audio signal louder than a pre-determined level, such as a nearby handclap. The transducer (210) also operates to receive the external audio signal and convert the external audio signal to an input audio signal. A trigger circuit (230) connects with the transducer (210). When the transducer (210) receives the external audio signal, the trigger circuit (230) produces a trigger signal to activate the audio storage device (220) to output the recorded message (310).</p> |
