Audio system
An audio system includes a circuit ( 12 ) for processing an audio signal, which circuit ( 12 ) having an input ( 20 ) for receiving the audio signal and an output ( 26 ) for supplying an output signal. The circuit ( 12 ) further includes a harmonics generator ( 22 ) coupled to the input ( 20 ) for generating harmonics of the audio signal and an adding circuit ( 24 ) coupled to the input ( 20 ) as well as to the harmonics generator ( 22 ) for supplying a sum of the audio signal and the generated harmonics to the output ( 26 ). The harmonics generator ( 22 ) includes an integrator ( 34 ) for integrating the audio signal and, coupled thereto, a resetting circuit ( 36 ) for resetting the integrator ( 34 ) at resetting times.
1. An audio system comprising a circuit for processing an audio signal, said audio signal processing circuit comprising:
an input for receiving the audio signal and an output for supplying an output signal;
filtering means coupled to said input for passing low-frequency components of said audio signal to form a filtered audio signal;
a harmonics generator coupled to the filtering means for generating harmonics of the filtered audio signal; and
adding means coupled to the input as well as to the harmonics generator for supplying a sum of the audio signal and the generated harmonics to the output, characterized in that the harmonics generator comprises:
an input for receiving the filtered audio signal;
an integrator coupled to the input for integrating the filtered audio signal, said integrator comprising means for limiting an amplitude of the integrated signal, and said integrator adapting an integration time-constant in dependence on a frequency of the integrated signal; and
resetting means coupled to the integrator for resetting the integrator at resetting times.
2. The audio system as claimed in claim 1 , characterized in that the integrator stops the integration in dependence on an amplitude of the integrated signal.