AUDIO SIGNAL PROCESSING DEVICE AND AUDIO SIGNAL PROCESSING METHOD

摘要

Provided is a technique of reducing an unnecessary distortion component caused by a gain change independently of the type of inputted audio signal. When a signal (Sin) is inputted to an audio signal processing device (10) as shown in Fig. 1, a signal branching section (11) divides the signal into first to Nth routes (R1 to Rn). First to Nth preceding stage BPFs (111 to 11n) select a predetermined frequency band set to each stage and outputs the frequency bands to first to Nth AGCs (121 to 12n) in each of the first to Nth routes (R1 to Rn). The first to Nth AGCs (121 to 12n) perform the gain adjustment of each acquired signal and outputs the signals to first to Nth subsequent stage BPFs (131 to 13n). Each of the first to Nth subsequent stage BPFs (131 to 13n) eliminates an out-of-band distortion component by means of band limiting processing. An adder (60) synthesizes a signal having been subject to the band limiting processing and outputs the signal to an output device such as a speaker or a post-process processing means.