| 摘要 |
PURPOSE:To suppress the production of unpleasant sound noise at ON/OFF state of a hearing sense correction circuit comprising a digital filter by mixing an output signal of the hearing sense correction circuit and a signal bypassing the hearing sense correction circuit and varying continuously the mixing ratio. CONSTITUTION:A ratio variable mixing means 12 is provided, which mixes an output signal of the hearing sense correction means 11 and a signal from a bypass 14 bypassing the hearing sense correction means 11. Moreover, a ratio setting means 13 is provided, which varies gradually the ratio to change the output of the ratio variable mixing means 12 from the signal only from the bypass 14 into the output signal only of the hearing sense correction means 11 or vice versa. When a switch is operated from ON to OFF or vice versa, the output signal is changed continuously from the output signal of the hearing sense correction means 11 into a signal not including it or vice versa. Thus, sound noise is suppressed. |
