| 摘要 |
PURPOSE:To clearly discriminate an audio time announcing signal from the audio output of a headphone stereo or radio, by preferentially changing over and selecting an audio time announcing input signal by a signal change-over means when an audio time signal is necessary. CONSTITUTION:A clock circuit 1 supplies its clocking content to an audio synthesizer circuit 3 as a digital signal when an operation button 2 is pushed. The digital signal supplied to the audio synthesizer circuit 3 from the clock circuit 1 when the operation button 2 is pushed is changed over to an audio signal to be supplied to a change-over switch 4. The change-over switch 4 is subjected to change-over control by the control signal from the clock circuit 1 and changes over the output of the audio synthesizer circuit 3 and the output of an audio circuit 5 supplied through a mute circuit 6. Therefore, when the operation button 2 is pushed, if the audio signal supplied from the audio synthesizer circuit 3 is preferentially selected to be outputted from a headphone 7, the audio time announcing signal from a clock can be clearly discriminated even during the use of a radio. |
