Simulcast Radio Audio Switching Using Digital Quality Evaluation
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Solution Overview
Problem
Existing radio devices in vehicles face challenges in maintaining audio quality during switching between simulcast broadcastings due to varying reception conditions and noise interference, leading to inconsistent audio quality before and after switching.
Innovation Solution
A radio device capable of receiving digital, analog, and IP radio signals, with an audio quality evaluation unit that assesses analog audio quality based on digital audio, and switches audio output accordingly to ensure high-quality audio by considering reception and noise conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switching is performed between simulcast broadcastings based on reception conditions, then audio output continuity is maintained, but audio quality inconsistency occurs due to different characteristics of broadcast methods
Solution Approach 1:
The system performs audio quality evaluation by comparing digital radio audio with analog radio audio to determine the quality of analog audio. This feedback mechanism allows the switching unit to make informed decisions about when to switch between broadcast sources, ensuring both continuity and quality consistency. The evaluation unit continuously monitors audio quality and provides feedback to the switching unit for optimal source selection.
Solution Approach 2:
Digital radio audio serves as an intermediary reference for evaluating analog radio audio quality. By using the digitally received audio of the same content as a benchmark, the system can objectively assess the quality of analog audio without directly comparing different broadcast sources, thereby maintaining quality consistency during switching.
2Adaptability or versatility
If multiple radio signal reception methods are supported, then adaptability to different broadcast conditions is improved, but device complexity increases
Solution Approach 1:
The radio device is designed to receive multiple types of radio signals (digital radio, analog radio, and IP radio) through a unified reception unit. This multi-functional approach allows the device to adapt to different broadcast conditions without requiring separate dedicated receivers for each broadcast type, thereby managing complexity while maintaining versatility.
Solution Approach 2:
The system uses digital radio audio as an intermediary reference to evaluate and compare the quality of analog radio audio. This intermediary approach simplifies the complexity of directly comparing multiple broadcast sources by providing a common reference point, making the evaluation process more manageable.
3Manufacturing precision
If audio quality evaluation is performed using digital radio audio as reference, then audio quality consistency is improved, but processing time increases
Solution Approach 1:
The system performs audio quality evaluation continuously in the background using digital radio audio as a reference, even before switching is needed. This preliminary evaluation ensures that when switching decisions are required, the quality comparison is already available or can be quickly determined, minimizing the time loss associated with switching decisions.
Data Source
AI summary
There is provided a radio device including: a reception unit configured to receive a digital radio signal as a radio signal of digital radio broadcasting, an analog radio signal as a radio signal of analog radio broadcasting, and an IP radio signal as a radio signal of IP radio broadcasting, the digital radio broadcasting, the analog radio broadcasting, and the IP radio broadcasting being related to simulcast broadcasting; an evaluation unit configured to perform audio quality evaluation on an analog radio audio by using a digital radio audio based on the digital radio signal and the analog radio audio based on the analog radio signal; and a switching unit configured to switch, based on the audio quality evaluation, an audio output of the digital radio audio to any one of the analog radio audio and an IP radio audio based on the IP radio signal.