Audio signal processing device with enhancement of low-pitch register of audio signal

摘要

An audio signal processing device is designed to enhance the low-pitch register of an audio signal by generating harmonics causing a missing fundamental effect with a light load of processing but without damaging an audio waveform. The audio signal processing device includes a filtering part (e.g. a band-pass filter configured of a high-pass filter and a low-pass filter) that extracts a low-pitch signal from an audio signal input thereto; a dynamic range compression part that compresses a dynamic range of the low-pitch signal by use of a time-variant gain relative to a peak of the low-pitch signal, which is detected via a peak hold operation using a predetermined time constant, thus producing a compressed signal; and an adder that adds the compressed signal to the audio signal so as to produce a processed audio signal including harmonics.

主权项

1. An audio signal processing device comprising:
a filtering part that extracts a low-pitch signal from an audio signal input thereto; a dynamic range compression part that compresses a dynamic range of the low-pitch signal by use of a time-variant gain relative to a peak of the low-pitch signal, which is detected via a peak hold operation using a predetermined time constant, thus producing a compressed signal; and an adder that adds the compressed signal to the audio signal so as to produce a processed audio signal including harmonics causing a missing fundamental effect, wherein the dynamic range compression part includes an absolute value calculation part that calculates an absolute value of the low-pitch signal; a peak hold part that detects a peak of the absolute value of the low-pitch signal by use of the predetermined time constant; a gain determination part that determines the time-variant gain based on the detected peak of the absolute value of the low-pitch signal; and a level adjustment part that amplifies the low-pitch signal by use of the time-variant gain, thus producing the processed audio signal with a compressed dynamic range, and wherein the predetermined time constant of the peak hold part is in a range of fifty times higher to two-hundred times higher than a time constant corresponding to a high cutoff frequency of the filtering part.