Audio Playback Verification Using Embedded Test Frequency Signals
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Solution Overview
Problem
Existing audio processing systems often fail to ensure reliable playback of safety-critical audio signals, leading to potential misinterpretation or missed alerts due to component failures or malfunctions, necessitating a more robust verification mechanism.
Innovation Solution
An audio processing system comprising an audio controller, an audio synthesis stage, a frequency monitor, a frequency-selective audio sensor, and a safety processor that includes a predefined test segment with a specific frequency component to verify the operation of components and ensure correct audio playback, suspending playback if malfunctions are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If audio signals are played at loud volume and/or repeatedly, then the probability that they are heard is increased, but the risk of misinterpretation or incorrect playback increases
Solution Approach 1:
The system performs preliminary verification of the audio playback chain before actual safety-critical audio signals are played. Test signals are generated and traced through the entire audio processing chain (audio controller, audio synthesis stage, frequency monitor, audio sensor) to verify correct operation in advance, preventing misinterpretation errors before they occur
Solution Approach 2:
The system implements feedback by monitoring the output audio signal with both a frequency monitor and a frequency-selective audio sensor. The detected frequency is fed back to the safety processor, which compares it with the expected test frequency to verify correct playback. This closed-loop feedback ensures audio signal integrity while allowing loud/repeated playback
2Reliability
If audio processing components are added to verify playback correctness, then audio signal integrity is improved, but system complexity increases
Solution Approach 1:
The safety processor performs multiple functions: it generates test signals, controls the audio playback sequence, monitors frequency output, and verifies playback correctness. The frequency-monitoring functionality serves both as a test signal generator and as a verification sensor, reducing the need for separate dedicated components
Solution Approach 2:
Test signals serve as intermediaries between the safety processor and the audio processing chain. These test signals carry verification information through the audio controller, audio synthesis stage, and audio sensor, enabling indirect verification of component operation without requiring direct access to internal component states
3Reliability
If test signals are continuously monitored, then component operation verification is improved, but processing time for safety-critical audio is reduced
Solution Approach 1:
Component verification is performed in advance before safety-critical audio playback. The test signal sequence (generation, playback, monitoring, verification) is executed preliminarily to establish component reliability, allowing subsequent safety-critical audio to be played without repeated verification delays
Solution Approach 2:
The system implements periodic verification where test signals are played at defined intervals to check component operation. Between periodic test signal playbacks, safety-critical audio can be played without verification overhead, balancing continuous monitoring needs with timely audio delivery
Data Source
AI summary
The present invention relates to an audio processing system (100) for providing safe audio playback. An audio controller (110) outputs an intermediate audio signal (M) having a predefined test segment comprising a predefined test frequency component. An audio synthesis stage (120) provides, based on the intermediate audio signal, an output audio signal (P) for use in audio playback. An audio test is performed based on a first segment of the output audio signal corresponding to the test segment of the intermediate audio signal, and a safety processor (150) declares correct the operation of the audio synthesis stage in case the result of the audio test is positive. The safety processor declares correct the operation of a frequency monitor (130) if both the frequency monitor and a frequency-selective audio sensor (140) detect the test frequency in the first segment of the output audio signal.