DCO Clock Transitioning for Pop-Free Multi-Mode Audio Processing
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Solution Overview
Problem
Audio processing circuitry in mobile devices experiences abrupt changes in power modes, leading to audible artifacts like pops and clicks during transitions, which affect user experience and audio quality.
Innovation Solution
A digitally controlled oscillator (DCO) with a clock controller that transitions between high-resolution and low-resolution modes using a transition control word, allowing for seamless mode switching without significant frequency changes, thereby reducing audible artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power modes are switched in audio processing circuitry, then power consumption is reduced, but audible artifacts like pops and clicks occur during transitions
Solution Approach 1:
The system performs preliminary actions by pre-calculating transition control words that will gradually adjust the DCO frequency from the first operating mode to the second operating mode. This gradual transition, planned in advance, prevents abrupt frequency changes that would cause audible artifacts during power mode switching.
Solution Approach 2:
The system dynamically adjusts the DCO frequency during mode transitions by implementing a transition period with intermediate control words. This dynamic adjustment allows the frequency to change gradually rather than abruptly, maintaining audio quality while switching between power modes.
2Measurement precision
If high-resolution mode is used for audio processing, then audio quality is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between high-resolution and low-resolution operating modes based on real-time audio processing requirements. The DCO can operate in high-resolution mode when audio quality is prioritized and transition to low-resolution mode when power savings are needed, with smooth transitions between modes.
Solution Approach 2:
The system changes the resolution parameter of the DCO by adjusting the control word precision. In high-resolution mode, more bits are used for DCO control providing finer frequency adjustment and better audio quality. In low-resolution mode, fewer bits are used reducing power consumption while maintaining adequate performance for non-critical audio tasks.
Data Source
AI summary
Methods and systems for determining clock signals for audio processing using different operating modes are provided. In one aspect, a transition control word is determined to transition from a first control word for a first operating mode to a second control word for the second operating mode. The transition control word may be used to process the received audio signal while transitioning between the operating modes. After the transition, the second control word may be used to process the received audio signal using the second operating mode. The transition control word may be used to transition between various aspects of the operating modes, including different frequencies or resolutions, control systems, power levels, and more.