Audio reproducing apparatus

An audio signal processing apparatus comprising:

• a harmonic overtone adder and an equalizer,
• the harmonic overtone adder including:
• a high-pass filter for extracting from an audio signal a first frequency component equal to or higher than a first predetermined frequency;
• a filter for extracting from the audio signal a second frequency component equal to or lower than half a second predetermined frequency;
• an harmonic overtone generator for generating a frequency-doubled harmonic overtone component from an output from the filter;
• and
• a first combining unit for combining the first frequency component extracted by the high-pass filter and the frequency-doubled harmonic overtone component generated by the harmonic overtone generator;
• and
• the equalizer including:
• a level detector for detecting a level of the frequency-doubled harmonic overtone component contained in an output from the first combining unit;
• a gain controller for controlling dynamically the level of the frequency-doubled harmonic overtone component contained in the output from the first combining unit based on a detection output from the level detector;
• and
• a second combining unit for combining the output from the first combining unit with the frequency-doubled harmonic overtone component output from the gain controller.