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US 10,938,363 B2Granted
Audio circuit
AssigneeRohm Co., Ltd.
InventorMitsuteru Sakai
Life of this patent
Estimating the term…
Abstract
A D/A converter coverts a digital audio signal into an analog audio signal. An analog volume circuit receives an output of the D/A converter. A controller controls the analog volume circuit. The controller shortens transition time at each step in the analog volume circuit further as gain is lower.
Claims9
An audio circuit comprising:
- a digital/analog (D/A) converter structured to covert a digital audio signal into an analog audio signal;
- an analog volume circuit coupled to receive an output of the D/A converter;
- and
- a controller structured to control gain of the analog volume circuit,
- wherein the controller is structured to shorten transition time at each step in the analog volume circuit further as the gain is lower and to change the gain of the analog volume circuit step by step toward a target value corresponding to a volume value after change;
- and
- the change amount of the gain for each step is constant.
4 more elements
An audio circuit comprising:
- an isolation amplifier coupled to receive an analog audio signal;
- an analog volume circuit coupled to receive an output signal of the isolation amplifier;
- and
- a controller structured to control gain of the analog volume circuit,
- wherein the controller is structured to shorten transition time at each step in the analog volume circuit further as the gain is lower and to change the gain of the analog volume circuit step by step toward a target value corresponding to a volume value after change;
- and
- the change amount of the gain for each step is constant.
4 more elements
Dependencies are inferred from the claim text.