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US 11,533,033 B2Granted
Audio signal amplifier gain control
AssigneeBose Corporation
InventorsBrian Sennett, Robert John Currie, Christopher J. Perkins, Thomas S. Daly, Craig Small
Life of this patent
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Abstract
A system for controlling the gain of an input signal in an audio signal amplifier. The system includes a user-operable gain control, and analog and digital circuit elements that together are configured to modify the gain of the input signal in response to the user-operable gain control.
Claims17
A system for controlling the gain of an input signal in an audio signal amplifier, comprising:
- a user-operable gain control;
- at least one analog circuit element comprising an analog pre-amplifier, and at least one digital circuit element comprising a digital signal processor (DSP) downstream of the pre-amplifier, wherein the analog and digital circuit elements together are configured to modify the gain of the input signal in response to the user-operable gain control;
- and
- wherein the at least one analog circuit element is configured to increase the gain of the input signal in each of a plurality of first discrete gain steps as the gain control is increased, the at least one digital circuit element is configured to decrease the gain of the input signal in each of a plurality of second discrete gain steps as the gain control is increased, such that the at least one digital circuit element gains compensate for the at least one analog circuit element gains, and the DSP is further configured to apply a system gain in addition to the compensation gain, wherein a total gain applied by the system and established by the user-operable gain control is based on a combination of the analog gain, the compensation gain, and the system gain.
1 more element
A system for controlling the gain of an input signal in an audio signal amplifier, comprising:
- a user-operable gain control;
- an analog pre-amplifier that defines a plurality of first discrete gain steps that each accomplish different gains on an audio signal;
- a digital signal processor (DSP), downstream of the pre-amplifier, that is configured to define a plurality of second discrete compensation gain steps that are the opposite of the first gain steps, to compensate for the pre-amplifier gain, wherein the quantity of first discrete gain steps is the same as the quantity of second discrete gain steps, and wherein the DSP is further configured to apply a system gain in addition to the compensation gain;
- wherein an overall gain accomplished by the first gain steps and the second compensation gain steps together is constant in each of the combined first and second discrete gain steps;
- and
- wherein the analog and digital circuit elements together are configured to modify the gain of the input signal in response to the user-operable gain control.
3 more elements
Dependencies are inferred from the claim text.