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US 10,476,446 B2Granted
Total harmonic distortion (THD) controlled clip detector and automatic gain limiter (AGL)
AssigneeTexas Instruments Incorporated
InventorsShun Qian, Kim Nordtorp Madsen, Lucia Wan
Life of this patent
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Abstract
The disclosed embodiments include an audio amplifier system configured to provide a total harmonic distortion (THD) controlled clip detector and an automatic gain limiter (AGL) solution for a closed-loop amplifier. The audio amplifier system is capable of maintaining high power output without hard distortion (i.e., hard clipping) for providing better acoustics, while preventing damage to the system.
Claims7
An audio amplifier system comprising:
- an attenuator;
- an amplifier coupled to the attenuator;
- a voltage controlled current source (VCCS) coupled to the amplifier;
- a clip detector coupled to the VCCS, wherein the clip detector comprises:
- a sense resistor coupled to a feedback resistor;
- a first input of a comparator coupled to the sense resistor and the feedback resistor;
- a voltage divider coupled to a second input of the comparator;
- and
- a multiplexer coupled to the voltage divider.
6 more elements
A clip detector comprising:
- a sense resistor coupled to a feedback resistor;
- a first input of a comparator coupled to the sense resistor and the feedback resistor;
- a voltage divider coupled to a second input of the comparator;
- a multiplexer coupled to the voltage divider;
- and
- a debouncer coupled to the comparator.
3 more elements
An audio amplifier system comprising:
- an attenuator;
- a closed-loop class D amplifier couple to the attenuator;
- a voltage controlled current source (VCCS) coupled to the closed-loop class D amplifier;
- and
- a clip detector coupled to the VCCS;
- wherein the clip detector comprises:
- a sense resistor coupled to a feedback resistor;
- a first input of a comparator coupled to the sense resistor and the feedback resistor;
- a voltage divider coupled to a second input of the comparator;
- a multiplexer coupled to the voltage divider;
- and
- a debouncer coupled to the comparator.
9 more elements
Dependencies are inferred from the claim text.