Audio Amplifier Gain Control With Analog-Digital Step Compensation
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Solution Overview
Problem
Existing audio amplifiers require separate gain controls that are unintuitive and can lead to poor signal quality if used improperly, and remote control integration is limited.
Innovation Solution
A system combining analog and digital circuit elements to modify gain in response to a single user-operable control, with discrete gain steps in both domains to maintain consistent overall gain, and digital processing to compensate for analog gain and remove signal discontinuities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single analog control is used to drive multiple analog gain stages, then the control can be operated remotely by a mobile application, but the control is not configured for remote operation and its usefulness is limited
Solution Approach 1:
The patent creates a virtual copy of the physical control knob in the mobile application interface. The virtual control member replicates the appearance and functionality of the physical control member, allowing users to operate the gain control remotely through the mobile application with the same user experience as the physical interface.
2Adaptability or versatility
If separate gain controls are provided for wide input level range, then the input level range can be divided into smaller segments, but the controls become confusing and unintuitive to operate
Solution Approach 1:
The patent merges the physical and virtual control members into a unified control system. Both control members operate the same gain control function and are synchronized, presenting a single intuitive control interface to the user rather than separate, confusing controls. The system combines analog and digital control paths while maintaining a unified user experience.
Solution Approach 2:
The single gain control is designed to handle multiple input level ranges universally. By combining analog and digital gain stages under a single control interface, the system provides wide input level coverage (beyond the ADC input range) while maintaining intuitive operation. The control member serves multiple functions: it controls analog gain stages for high-level inputs and digital gain for lower-level inputs, adapting its behavior based on the input signal level.
3Adaptability or versatility
If multiple analog gain stages are used to handle wide input levels, then the input level range can be extended, but signal quality deteriorates if controls are used improperly
Solution Approach 1:
The system uses feedback to monitor the input signal level and automatically selects the appropriate gain stage configuration. The digital signal processor detects the input level and controls the analog gain stages accordingly, ensuring that the signal remains within the optimal range for the ADC converter. This feedback mechanism prevents improper control usage from degrading signal quality while maintaining extended input level range.
Solution Approach 2:
The system dynamically changes the gain parameters of the analog circuit elements based on the input signal level. By adjusting the analog gain stages in response to detected input levels, the system extends the usable input range while maintaining signal quality. The digital signal processor modifies the analog gain parameters to match the input conditions, preventing clipping and distortion.
Data Source
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AI summary
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.