| 摘要 |
An audio-signal processing apparatus and a method thereof are provided to reproduce sounds at an appropriate sound level without degrading the music reproducibility. An audio signal processing apparatus comprises: band-division filters(2a-2e) that divide a first audio signal into a plurality of frequency bands and output second audio signals in the respective frequency bands; sound-level amplifiers(3a-3e) that amplify the second audio signals in the respective frequency bands in accordance with gain characteristics that covers a sound-level range from a lowest sound level to a highest sound level of each second audio signal, the sound-level range having a low sound level range from the lowest sound level to a first specific sound level, a high sound level range from a second specific sound level to the highest sound level, and an intermediate sound-level range from the first to second specific sound levels between the low and high sound level ranges, the intermediate sound-level range having a transition point having a sound level higher than the first specific sound level but lower than the second specific sound level, in which each second audio signal is amplified by the corresponding sound-level amplifier such that a sound level of each second audio signal is increased from the first specific sound level to the sound level of the transition point and then lowered from the sound level of the transition point to the second specific sound level in the intermediate sound-level range in accordance with the gain characteristics; and an adder(5) that adds the second audio signals thus amplified and outputs the added second audio signals as a third audio signal.
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