Multi-Base-Station Audio Synchronization for Echo-Free Radio Playback
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Solution Overview
Problem
Echoes occur in the reproduction of radio signals received by multiple base stations due to varying transit times through an IP network, causing superimpositions and reducing the efficiency and reliability of communication, especially in marine radio systems.
Innovation Solution
A method involving similarity analysis of audio signals received by different base stations before reproduction, using cross-correlation to identify and synchronize signals, ensuring echo-free reproduction by selecting or synchronizing the audio signals based on similarity and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple base stations receive and transmit audio signals via IP network to ensure maximum coverage, then coverage area is improved, but echo and superimposition occur due to varying transit times
Solution Approach 1:
The system performs a similarity analysis of incoming audio signals before reproduction to identify signals originating from the same radio transmission. By预先 analyzing signal similarity and determining which signals to reproduce or suppress, the system prevents echo and superimposition from occurring in the first place, rather than attempting to correct them after they manifest.
Solution Approach 2:
The control station receives audio signals from multiple base stations and implements a feedback mechanism where the reproduction decision for one signal affects the handling of subsequent signals. When a signal is identified as similar to one already being reproduced, the system suppresses the duplicate, creating a closed-loop control system that actively manages echo prevention based on real-time signal analysis.
2Speed
If audio signals are transmitted simultaneously from multiple base stations, then transmission speed is improved, but reliability deteriorates due to timing variations causing echo
Solution Approach 1:
Before reproducing audio signals, the control station performs a similarity analysis to determine whether incoming signals are duplicates. This preliminary action allows the system to maintain simultaneous transmission from multiple base stations for speed while preventing unreliable echo-filled reproduction by suppressing duplicate signals identified through similarity comparison.
Solution Approach 2:
The system changes the parameter of signal reproduction by selectively enabling or disabling reproduction based on similarity analysis results. Instead of always reproducing all incoming signals or never reproducing them, the system dynamically adjusts reproduction parameters based on the identified similarity between signals, maintaining both speed and reliability.
3Manufacturing precision
If digital transmission via IP network is used to improve transmission quality, then signal quality is improved, but latency varies causing timing issues in reproduction
Solution Approach 1:
The control station performs similarity analysis of audio signals before reproduction to identify signals that arrived with varying latency. By预先 determining which signals are duplicates through similarity comparison, the system can suppress late-arriving duplicate signals and reproduce only the first-quality signal, thereby compensating for IP network latency variations without sacrificing signal quality.
Solution Approach 2:
The system converts the harmful effect of varying transmission latency into a beneficial outcome by using similarity analysis to identify and suppress duplicate signals that arrive late. The latency variation, which initially causes echo problems, is transformed into a distinguishable characteristic that enables the system to selectively reproduce only high-quality signals, turning the latency issue into a basis for improved signal selection.
Data Source
AI summary
A method and system eliminate echoes in the reproduction of radio signals transmitted via a radio channel. A radio signal transmitted by a transmitter is received by at least a first base station as a first audio signal and by at least a second base station as a second audio signal. The received audio signals are transmitted via an IP network to a control station for reproduction. The first and second audio signals arrive in the control station at different times or with a time shift and undergo a similarity analysis before their reproduction in the control station in order to reproduce the radio signal contained in both audio signals without echo if a similarity is established between the first audio signal and the second audio signal.