Radio Receiver Audio Fingerprinting for Service Continuity
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Solution Overview
Problem
Radio receivers face challenges in maintaining service continuity when RDS service is not available or its signal reception quality is weak, particularly in countries like China where RDS is not deployed, and in cases where radio stations do not provide RDS service or have poor reception quality.
Innovation Solution
A method and receiver design that enable radio service continuity by detecting and switching to alternative frequencies with synchronized audio content broadcasts, using audio content comparison and quality threshold criteria, and incorporating processors to assess audio quality and perform frequency scans, allowing for switchover to higher quality digital broadcasts like DAB or HD Radio when FM quality is inadequate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RDS service is used for radio service continuity, then frequency switchover capability is improved, but the system becomes inapplicable in countries or stations without RDS deployment
Solution Approach 1:
The patent introduces audio content fingerprinting as an intermediary mechanism between frequency switchover and station identification. Instead of directly relying on RDS PI codes, the system uses audio fingerprints to detect and verify broadcast content across frequencies, enabling service continuity in both RDS and non-RDS environments through this intermediate detection layer
Solution Approach 2:
The system implements a universal frequency switchover mechanism that functions across multiple broadcast systems (RDS, non-RDS, different countries, digital and analog formats). The audio content detection and comparison mechanism serves multiple purposes: identifying stations, verifying content synchronization, and enabling switchover decisions regardless of the underlying broadcast standard
2Reliability
If RDS PI code decoding is used for station identification, then frequency switchover is enabled, but reception quality requirements increase due to limited sensitivity
Solution Approach 1:
The patent replaces the RDS PI code decoding mechanism (which requires high signal quality) with audio content fingerprinting technology. This substitution allows station identification and content verification to occur at lower signal levels, as fingerprint matching can be performed on weaker signals that would be insufficient for reliable RDS decoding
Solution Approach 2:
The system changes the detection parameter from RDS PI code intensity (which requires strong signals) to audio content temporal and spectral characteristics. By analyzing the temporal alignment and spectral fingerprint of audio content, the system can identify broadcasts at lower quality thresholds where RDS decoding would fail
3Reliability
If frequency scanning is performed to detect alternative broadcasts, then service continuity is improved, but detection complexity and processing time increase
Solution Approach 1:
The patent extracts and stores audio content fingerprints in advance during the frequency scanning process, before switchover decisions are required. This preliminary extraction and temporal alignment of fingerprints from multiple frequencies allows for rapid comparison and identification during actual switchover events, reducing real-time processing complexity
Solution Approach 2:
The system creates simplified copies of broadcast content in the form of audio fingerprints and temporal alignment data. These compact representations enable efficient comparison across frequencies without requiring full audio stream processing, significantly reducing the computational complexity of frequency scanning and switchover detection
Data Source
AI summary
Method for managing, in a receiver, a radio service continuity based on synchronized broadcasts of identical audio contents on different frequencies, comprising, the receiver being tuned to a first frequency corresponding to a first broadcast of a first audio content, a detection in the receiver of a second audio content broadcast on a second frequency, having a level of quality above a threshold and paired with the first audio content.