| 摘要 |
PROBLEM TO BE SOLVED: To improve the pleasant reproduced sound of the sound signal of acoustic equipment by adding a noise component having a spectrum close to that of a spectrum component which is reduced or becomes absent at the time of reproduction to a source sound signal. SOLUTION: After the sound signal is inputted from an input terminal 9 to a buffer amplifier 1, one branched component is connected to an output terminal 10. The other is inputted to a filter circuit 2 to pass a signal of a specific band, and then this signal is amplified by an amplifier 3 to a proper level and detected by a detecting circuit 4. This signal is inputted to a multiplier 8 through a time constant circuit 5 to obtain a control signal for adjusting the level of the noise component added to the source sound signal. The noise component added to the source sound signal, on the other hand, is obtained from the output of a noise generator 6. The output of the noise generator 6 is supplied to a filter circuit 7, which passes a frequency band of >=20kHz and inputs it the multiplier 8, where the signal is multiplied by the level control signal and the result is added to the current sound signal. |
