| 摘要 |
PURPOSE:To reproduce a very low-frequency sound by providing a low pass filter for passing through only the low frequency component of the output signal of a reproducing device and a musical interval converting circuit for converting the frequency of the output of the low pass filter to a half. CONSTITUTION:The output signal S1 of the reproducing device is branched into two by a branching means 7 and the first output is directly inputted to the first input end of an adding means. The second output is converted into the output signal S3 only of the low frequency component by the LPF 4 for passing only the low frequency. The signal S3 is converted to the signal S4 of the frequency half of the frequency of the input signal S3 by the musical interval converting circuit 5 for making the frequency of the output signal a half of the frequency of the input signal. Namely, the low frequencies included in the signal S4 and the output signal S1 of the reproducing device 1 are lowered by an octave. In this manner, the signal of the low frequency is lowered and moved by the octave, thereby it can be converted to the signal of a very low-frequency sound component.
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