Audio Processing Path Muting for PCM and DoP Format Switching
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Solution Overview
Problem
Existing audio signal processing technologies face issues when processing multi-bit and single-bit audio signals, leading to undesirable noise and transient artifacts when switching between formats, such as PCM and DoP, due to incorrect decoding and processing paths.
Innovation Solution
An audio processing circuit with separate paths for multi-bit and single-bit signals, which detects the signal type and automatically mutes the incorrect path to prevent noise, allowing seamless switching between formats by using a shared input and output node and employing a signal type detector and switch module to manage volume control and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate audio processing paths for multi-bit and single-bit signals are used, then noise and artifacts are reduced when switching between formats, but device complexity increases
Solution Approach 1:
The patent divides the audio processing system into separate processing paths for multi-bit signals and single-bit signals. Each path is optimized for its specific signal type, preventing the harmful effects of processing the wrong signal type. A format detector segments the incoming audio stream to route it to the appropriate processing path, thereby reducing noise and artifacts while maintaining manageable complexity through modular design.
2Reliability
If automatic detection and switching between audio formats is implemented, then correct decoding is achieved, but processing time increases during format transitions
Solution Approach 1:
The system performs preliminary detection of the audio format at the beginning of processing and maintains this detection state throughout playback. The format detector analyzes the incoming signal characteristics in advance to identify whether it is multi-bit or single-bit, sets the appropriate processing path accordingly, and avoids repeated detection during playback, thereby minimizing processing time overhead while ensuring correct decoding.
3Object-affected harmful factors
If format detection and path switching is performed, then audio quality is improved, but ease of operation decreases due to automatic control complexity
Solution Approach 1:
The audio processing system performs self-service through automatic format detection and processing path selection. The format detector continuously monitors the incoming audio signal and automatically configures the processing parameters without requiring user intervention. This self-adjusting mechanism improves audio quality by ensuring the correct processing path is used while maintaining ease of operation, as the system handles all adjustments autonomously without burdening the user.
Data Source
AI summary
An audio processing circuit may have a first path for processing multi-bit audio signals in parallel with a second path for processing single-bit audio signals. The parallel paths may share a common input node for receiving audio data and a common output node for reproducing audio at a transducer. Each path may have a volume control for adjusting an output of the path. The audio processing circuit may determine a type of an audio signal received at the input. The path not corresponding to the detected type of the audio signal is muted, and the path corresponding to the detected type of audio signal is unmuted.