Radio Broadcasting Receiver Seamless Switching Mechanism
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Solution Overview
Problem
Existing radio broadcasting receiving devices face challenges in swiftly switching between FM and IP radio broadcasts with identical content, as they require a significant time period to calculate and implement the delay time for seamless switching, leading to prolonged voice output switching times.
Innovation Solution
A radio broadcasting receiving device with a delay unit, delay time calculation unit, and control unit that initiates time-extended or time-shortened output operations in parallel with delay time calculation, allowing for immediate voice switching without waiting for the delay time calculation to complete, thereby reducing the overall switching time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the delay time is calculated by comparing voice portions and the voice is delayed using time stretch before switching, then seamless switching between FM and IP radio broadcasts is achieved, but the switching time becomes relatively long
Solution Approach 1:
The delay unit initiates time-extended output operation in parallel with the delay time calculation unit performing delay time calculation, rather than waiting for calculation completion. This preliminary action reduces the total switching time while maintaining seamless switching quality through the delay unit's continuous operation until the calculated delay time is achieved.
Solution Approach 2:
The delay unit continuously performs the time-extended output operation from the moment the concurrent broadcasting receiving unit outputs audio data until the delay time reaches the delay target time. This continuous useful action ensures seamless switching without interruption, maintaining audio quality while optimizing the switching process efficiency.
2Measurement precision
If the delay unit waits for delay time calculation to complete before initiating time-extended output operation, then the delay time can be accurately determined, but the overall switching period increases
Solution Approach 1:
The control unit monitors the delay time of the audio data output by the delay unit and compares it with the delay target time. Based on this feedback, the control unit determines when to switch the output target audio data to the audio data output by the concurrent broadcasting receiving unit, ensuring accurate delay implementation while optimizing switching speed.
Solution Approach 2:
The delay unit starts the time-extended output operation before the delay time calculation completes, performing preliminary delay action in parallel with the calculation process. This approach maintains measurement precision through the feedback mechanism while significantly improving switching speed by eliminating sequential waiting time.
Data Source
AI summary
At the time of switching a voice to be output from radio broadcasting to IP radio broadcasting, a time stretch operation for extending, in a temporal axis direction, a received voice of the IP radio broadcasting is initiated (312), and a delay time of the received voice of the IP radio broadcasting with respect to a specific received voice of the radio broadcasting is calculated (314) in parallel to the time stretch operation. If the received voice of the radio broadcasting is delayed by an amount of the calculated delay time (318), the voice to be output is switched to the IP radio broadcasting (320).