Audio reproducing apparatus

Details Audio reproducing apparatus Audio reproducing apparatus

2007-09-27

2011-12-13

Menz, Laura (Department: 2813)

Electrical audio signal processing systems and devices

Including frequency control

Automatic tone control

C381S103000, C381S061000

Reexamination Certificate

active

08077882

ABSTRACT:
An audio signal processing apparatus includes a harmonic overtone adder and an equalizer. The harmonic overtone adder includes a high-pass filter for extracting from an audio signal higher than a first predetermined frequency, a filter for extracting a frequency component 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 frequency component output from the high-pass filter and the harmonic overtone component output from the harmonic overtone generator. The equalizer includes a level detector for detecting a level of an overtone component contained in an output from the first combining unit, a gain controller for controlling dynamically the level of the harmonic overtone component contained in the output from the first combining unit, and a second combining unit for combining the output from the first combining unit with the harmonic overtone component.

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