A system and method for close-down pop reduction
AssigneeICEpower a/s
InventorKennet Skov Andersen
Life of this patent
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Abstract
A close-down pop reduction system and a method for close-down pop reduction in an audio amplifier assembly are disclosed. The switching power conversion system comprises a forward path having a compensator and a switching power stage and a signal path from an output of a comparator in the switching power stage to a sequence control unit. The signal path includes a close-down timing circuit configured to provide a timing signal. The sequence control unit is configured to eliminate the input signal, increase the switch frequency of the close-down pop reduction system and disable the switching power stage at a moment in time within a PWM pulse of the switching power stage. Hereby, it is e.g. possible to minimize the audible pop during close-down of audio amplifier assemblies.
Claims10
A close-down pop reduction system for an audio amplifier assembly having an input signal and an output signal, said close-down pop reduction system comprising:
- a forward path between the input signal and the output signal comprising a compensator connected to a switching power stage;
- and
- a signal path from an output of a comparator in the switching power stage to a sequence control unit, which signal path includes a close-down timing circuit configured to provide a timing signal;
- wherein said sequence control unit is configured to:
- eliminate the input signal;
- increase the switch-frequency of the switching power stage;
- and
- disable the switching power stage at a moment in time within a PWM pulse of the switching power stage based on said timing signal from said close-down timing circuit.
A method for close-down pop reduction in an audio amplifier assembly having an input signal and an output signal, wherein said audio amplifier assembly comprises:
- a forward path comprising a compensator and a switching power stage;
- a feedback path comprising a feedback filter between an output of the switching power stage and an input of the compensator;
- wherein said method comprises the steps of:
- eliminating said input signal;
- increasing the switch frequency of the switching power stage;
- disabling the switching power stage at a predefined moment in time within a PWM pulse of the switching power stage.
Dependencies are inferred from the claim text.