Audio system with power-on/off noise suppression and audio amplifier thereof
AssigneeHimax Analogic, Inc.
InventorKuo-Hung Wu
Life of this patent
Estimating the term…
Abstract
An audio system with power-on/off noise suppression and an audio amplifier thereof are disclosed. The audio system includes a front stage circuit and an audio amplifier. The front stage circuit is powered by a first supply voltage and outputs an audio signal. The audio amplifier amplifies the audio signal to drive a load. When a level of the first supply voltage drops below a threshold, the audio amplifier is disabled.
Claims12
An audio system comprising:
- a front stage circuit powered by a first supply voltage and outputting an audio signal;
- and
- an audio amplifier, amplifying the audio signal to drive a load;
- wherein the front stage circuit operates normally only when the first supply voltage is above a threshold and the audio amplifier is disabled when a level of the first supply voltage drops below the threshold.
An audio amplifier powered by a second supply voltage and amplifying an audio signal from a front stage circuit to drive a load, wherein the front stage circuit is powered by a first supply voltage and operates normally only when the first supply voltage is above a threshold, the audio amplifier comprising:
- an input pin receiving a detection signal indicating a condition of the first supply voltage;
- and
- a disabling circuit decoupling the second supply voltage from the audio amplifier when the detection signal indicates a level of the first supply voltage lower than the threshold.
Dependencies are inferred from the claim text.