| 摘要 |
a first and a second buffer unit(10,11) delaying the left audio signal and the right audio signal for a short time; filter units(20,21,30,31) detecting the audio signals outputted from the first and the second buffer unit(10,11) as a low band audio signal and a high band audio signal; a first and a second switching unit(40,50) outputting the filtered audio signal repeatedly according to a control switching pulse; a pulse output unit(70) for controlling a filter controlling the period of the pulse; and an audio controlling unit(60) controlling the volume of the switched audio by a control signal from the pulse output unit(70).
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