Audio system
AssigneeU.S. Philips Corporation
InventorRonaldus M. Aarts
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Abstract
An audio system includes a circuit (12) for processing an audio signal, this 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) is embodied so as to limit the amplitude of the generated harmonics.
Claims5
An audio system comprising loudspeakers, and a circuit for processing an audio signal, whereby the circuit comprises:
- an input for receiving the audio signal and an output for supplying an output signal;
- a low-pass filter coupled to the input having a cut-off frequency at a known frequency for passing a portion of said audio signal having a frequency below said known frequency;
- a harmonics generator coupled to an output of the low-pass filter for generating harmonics of the low-pass 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:
- a full-wave rectifier for rectifying the audio signal;
- an integrator for integrating the rectified audio signal, said integrator generating the harmonics;
- and
- means for limiting an amplitude of the generated harmonics.
A circuit for processing an audio signal, comprising:
- an input for receiving the audio signal and an output for supplying an output signal;
- a low-pass filter coupled to the input having a cut-off frequency at a predetermined frequency for passing a portion of said audio signal having a frequency below said predetermined frequency;
- a harmonics generator coupled to the low-pass filter for generating harmonics of the 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:
- a full-wave rectifier for rectifying the low-pass filtered audio signal;
- an integrator for integrating the rectified audio signal, said integrator forming the harmonics;
- and
- means for limiting an amplitude of the generated harmonics.
A method for processing an audio signal, said method comprising the steps:
- low-pass filtering the audio signal to block frequencies above a predetermined frequency;
- generating harmonics of the low-pass filtered audio signal;
- and
- forming a sum of the audio signal and the generated harmonics,
- characterized in that the step of generating the harmonics comprises:
- full-wave rectifying the low-pass filtered audio signal;
- integrating the rectified audio signal thereby forming the harmonics;
- and
- limiting an amplitude of the generated harmonics.
Dependencies are inferred from the claim text.