Mobile Audio Gain Table Switching for Distortion Reduction
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Solution Overview
Problem
Mobile devices face degraded audio signal quality due to calibration processes based on limited test conditions, failing to account for varied user experiences and environmental factors, leading to suboptimal signal processing.
Innovation Solution
A mobile device with a processing unit that selects and applies gain tables based on signal strength and operating conditions to dynamically adjust audio signal processing, reducing distortion and improving audio quality by using calibration values stored in memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mobile device uses a fixed calibration process based on limited test conditions, then the calibration values can be determined efficiently, but the audio signal quality degrades under varied environmental conditions and multiple operating functions
Solution Approach 1:
The patent implements dynamic calibration by storing multiple sets of calibration values in a calibration database, each corresponding to different operating conditions (e.g., signal strength levels, operating modes). The system dynamically selects and applies the appropriate calibration values based on current environmental conditions and device state, transforming the static calibration process into a dynamic adaptive system that maintains audio quality across varied conditions
Solution Approach 2:
The system changes calibration parameters based on detected operating conditions. By monitoring signal strength and operating mode, the system selects different calibration value sets from the database, effectively changing the processing parameters to match current conditions. This allows the audio processing chain to adapt to different environmental and operational contexts
2Adaptability or versatility
If the mobile device performs multiple functions simultaneously (e.g., phone calls and web browsing), then user convenience increases, but audio signal quality degrades
Solution Approach 1:
The system dynamically adapts audio processing by selecting calibration values appropriate for the current operating mode. When multiple functions are performed simultaneously, the system identifies the active operating conditions and applies the corresponding calibration set, allowing the device to maintain audio quality while supporting versatile functionality
Solution Approach 2:
The system incorporates feedback mechanisms that monitor operating conditions and signal characteristics. Based on this feedback, the system selects appropriate calibration values from the database, creating a closed-loop system that maintains audio quality even when multiple functions are executed simultaneously
3Productivity
If the calibration process is based on a small subset of test devices under particular circumstances, then the calibration can be completed quickly, but it does not yield ideal calibration values for the average consumer's typical usage
Solution Approach 1:
The patent applies preliminary action by pre-computing and storing multiple sets of calibration values in the calibration database during manufacturing, each optimized for specific operating conditions. This preliminary preparation eliminates the need for time-consuming real-time calibration computations during device usage, maintaining productivity while improving accuracy across different conditions
Solution Approach 2:
The system uses different calibration parameters for different operating conditions. By preparing multiple calibration value sets with different parameters optimized for specific scenarios (signal strength levels, operating modes), the system achieves both efficient calibration process and accurate audio processing for average consumer usage patterns
Data Source
AI summary
A mobile device includes a processing device that converts a digital input signal to an analog output signal and a memory device that stores a plurality of gain tables, each including values associated with processing the digital input signal. The mobile device further includes at least one filter and at least one amplifier. The processing device is configured to select one of the plurality of gain tables based on the signal strength of the digital input signal and apply one or more values in the selected gain table to the filter, the amplifier, or both, to process the digital input signal, the analog output signal, or both. A method includes receiving a digital input signal, identifying a signal strength of the digital input signal, selecting one of a plurality of gain tables, and processing the digital input signal based on the selected gain table.