Digital Wireless Audio Transmission Error Rate Hysteresis
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Solution Overview
Problem
Digital wireless audio transmission systems often experience audible artefacts during high frequency transmission and processing, leading to suboptimal audio quality due to errors in the wireless transmission and decoding processes.
Innovation Solution
A digital wireless audio transmission system with a wireless receiving unit that includes an HF analysis unit for error detection, a decoding unit, and an error detection unit, which determines an error rate and adjusts audio output based on threshold values to prevent repeated muting and unmuting, ensuring stable audio delivery through hysteresis and error concealment mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error detection and threshold-based muting is implemented, then audio quality is improved by avoiding audible artefacts, but system complexity increases due to additional error detection units and threshold comparison mechanisms
Solution Approach 1:
The system segments error detection into two distinct units: an HF analysis unit that detects transmission errors in high frequency data, and a decoding unit that detects errors during audio data conversion. This segmentation allows each unit to specialize in specific error types, improving overall reliability while organizing complexity into manageable modules.
Solution Approach 2:
The system performs preliminary error detection and evaluation before audio output. The error detection unit continuously monitors error rates and compares them against threshold values in advance, enabling proactive muting decisions that prevent audible artefacts before they reach the output stage.
2Device complexity
If a single threshold value is used for muting, then the control logic is simplified, but repeated muting and unmuting occurs when error rates fluctuate around the threshold, degrading audio stability
Solution Approach 1:
The system introduces two distinct threshold parameters: a first threshold value for muting when error rates exceed it, and a second, lower threshold value for unmuting when error rates fall below it. This parameter differentiation creates a hysteresis effect that prevents rapid oscillation between muted and unmuted states, ensuring audio stability while maintaining relatively simple control logic.
3Productivity
If error concealment is enabled in the decoder, then audio continuity is maintained during error conditions, but audible artefacts may still occur when error rates exceed concealment capabilities
Solution Approach 1:
The system implements feedback by continuously monitoring error rates and using this information to control audio output. When error rates exceed the first threshold value, the system mutes the audio output, preventing audible artefacts that would occur if error concealment alone were used. This feedback mechanism ensures audio quality is maintained by adapting output based on real-time error conditions.
Data Source
AI summary
A digital wireless audio transmission system having a wireless receiving unit for wirelessly receiving a high-frequency signal. An HF analysis unit analyzes the received high-frequency data, detects errors in the transmission within a time window, and outputs the received data and first items of information in respect of the detected errors. A decoding unit converts/decodes the received high-frequency data into audio data. An error detection unit checks errors in the conversion of the decoding unit within a previously established time window and outputs second items of information in respect of errors during decoding of the received high-frequency data. An error rate is determined based on the first and second items of information. If the error rate exceeds a first threshold value then no audio signal is outputted. Only if the error rate falls below a second value, lower than the first value, is an audio output is then again effected.