Echo Time Delay Detection in Terminal Equipment
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Solution Overview
Problem
Existing echo time delay detection methods in terminal equipment are unable to perform echo elimination at the initial stage of a call due to the need for time to detect echo time delay, leading to poor call quality.
Innovation Solution
An echo time delay detection method that determines the echo time delay before a call starts by obtaining and processing audio signals, converting them into digital format, and calculating a reference signal to determine a first echo time delay value, allowing for timely and accurate echo elimination during the call.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If echo time delay detection is performed during the call process, then the detection can be done using actual call speech signals, but the terminal equipment cannot perform echo elimination within the detection period, resulting in poor call quality
Solution Approach 1:
The patent performs echo time delay detection before the call process begins by using ringback tone signals. The detection is completed during the pre-call phase, so that when the call starts, the echo time delay value is already available for immediate echo elimination. This preliminary action eliminates the time loss that would occur if detection were performed during the call.
2Productivity
If echo time delay detection is performed before call starts using ringback tone, then echo elimination can be performed timely, but the detection must be completed before the call access request is answered
Solution Approach 1:
The patent continuously performs echo time delay detection using ringback tone signals during the entire pre-call period. The detection process remains active from when the call access request is received until the call is answered, ensuring that the echo time delay value is determined as early as possible and that echo elimination can be performed without interruption once the call starts.
Data Source
AI summary
An echo time delay detection method, an echo elimination device, and terminal equipment are provided. The echo time delay detection method includes: obtaining an audio signal transmitted through air and acquired by an audio input device of terminal equipment when detecting a call access request, the audio signal corresponding to an audio output by an audio output device of the terminal equipment; converting the audio signal to obtain a signal to be processed; determining a reference signal corresponding to the audio signal; and determining an echo time delay value according to the reference signal and the signal to be processed.