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US 8,300,847 B2Granted
De-pop circuit and an associated audio system
AssigneeHimax Technologies Limited
InventorChih-Hsiung Chen
Life of this patent
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Abstract
A de-pop circuit adaptable to an audio circuit is disclosed. A high-pass filter generates a high-pass output signal according to an output signal of the audio circuit. A blockage circuit receives the high-pass output signal and a control signal, and generates an enable signal to activate the audio circuit according to the control signal and the high-pass output signal.
Claims16
A de-pop circuit adaptable to an audio circuit, comprising:
- a high-pass filter configured to generate a high-pass output signal according to an output signal of the audio circuit;
- and
- a blockage circuit coupled to receive the high-pass output signal and a control signal, the blockage circuit generating an enable signal to activate the audio circuit according to the control signal and the high-pass output signal;
- wherein the control signal becomes active to power on the audio circuit, the audio circuit is turned on initially and level of the output signal of the audio circuit is rising, and the rising level makes the high-pass output signal active and therefore turns off the audio circuit again;
- whereby the audio circuit is iteratively turned on and off until the output signal of the audio circuit approaches a highest level and thus finishes the power on operation without power-on pop noise.
2 more elements
An audio system with a de-pop circuit, the audio system comprising:
- a transducer;
- an audio circuit configured to drive the transducer;
- a high-pass filter configured to generate a high-pass output signal according to an output signal of the audio circuit;
- and
- a blockage circuit coupled to receive the high-pass output signal and a control signal, the blockage circuit generating an enable signal to activate the audio circuit according to the control signal and the high-pass output signal;
- wherein the control signal becomes active to power on the audio circuit, the audio circuit is turned on initially and level of the output signal of the audio circuit is rising, and the rising level makes the high-pass output signal active and therefore turns off the audio circuit again;
- whereby the audio circuit is iteratively turned on and off until the output signal of the audio circuit approaches a highest level and thus finishes the power on operation without power-on pop noise emanated from the transducer.
4 more elements
Dependencies are inferred from the claim text.