| 摘要 |
A loudness device includes a low-pass filter (LPF) which has a variable cut-off frequency and passes a low frequency band of an input signal; a high-pass filter (HPF) which has a variable cut-off frequency and passes a high frequency band of the input signal; a first synthesizer for synthesizing output signals from the LPF and HPF at a variable synthesizing rate to provide a first synthesized output; and a second synthesizer for synthesizing the input signal and an output from the first synthesizer at a variable synthesizing rate to provide a second synthesized output. In this configuration, the low-pass frequency band can be varied by varying the capacitance of the capacitor of the LPF, the high-pass frequency band can be varied by the resistance of the resistor of the HPF, the attenuation degree in the high-pass frequency band can be varied by varying the resistance of the resistor of the first synthesizer, and the attenuation degree of the intermediate frequency band can be varied. <IMAGE> |
