Call Quality Testing System Using Audio Signal Isolation
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Solution Overview
Problem
Current methods for testing call quality in communication devices are inefficient and prone to inaccuracies due to network instability, lacking a standardized approach to assess call quality objectively.
Innovation Solution
A system comprising a control device, a testing device, and a simulation base station that establishes a call between a tested communication device and the simulation base station, using standard audio to assess call quality by comparing processed and unprocessed audio signals, ensuring the test is independent of network factors and providing a reliable Mean Opinion Score (MOS) for evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional call quality testing methods are used, then testing can be performed using existing communication networks, but the test results are affected by network instability leading to inaccuracies
Solution Approach 1:
The patent extracts the call quality testing function from the unstable communication network environment and relocates it to a controlled local testing system. The testing device establishes a direct local connection with the tested communication device, separating the measurement process from network-dependent pathways, thereby eliminating network instability as a source of measurement error and improving both accuracy and reliability.
2Productivity
If automated testing systems are implemented, then testing efficiency is improved, but system complexity increases
Solution Approach 1:
The testing device is designed with multi-functionality, integrating audio signal generation, audio acquisition, processing capability, and MOS calculation functions within a single device. This universal design achieves automated testing efficiency while avoiding the complexity increase that would result from coordinating multiple specialized devices, as one device performs all necessary testing operations.
Solution Approach 2:
The testing device performs automated operations including generating test audio signals, acquiring processed audio from the tested device, processing the audio signals, calculating MOS values, and determining pass/fail results without requiring external intervention. This self-service capability maximizes testing efficiency while keeping the system relatively simple by eliminating the need for complex coordination between multiple automated components.
3Measurement precision
If standardized call quality assessment is implemented, then objective evaluation is achieved, but the testing method becomes more complex
Solution Approach 1:
The patent transforms subjective call quality assessment into objective measurement by changing the evaluation parameter from human perception to MOS (Mean Opinion Score) calculation. The testing device automatically processes audio signals through standardized algorithms to generate numerical MOS values, providing objective assessment. This parameter transformation is implemented through integrated software processing within the testing device, achieving objectivity without proportionally increasing hardware complexity.
Data Source
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AI summary
Systems and methods of testing call quality and control devices are provided according to examples of the present disclosure. In one aspect, the system includes a simulation base station, a tested communication device, a control device configured to transmit a call instruction such that a call between the tested communication device and the simulation base station is established, and a testing device configured to provide a standard audio, where the standard audio becomes a test audio after it is processed by the tested communication device during a transmission process via the call and the test audio is sent back to the testing device, and perform a similarity comparison between the test audio and the standard audio to obtain a similarity comparison result, where the similarity comparison result shows the call quality of the tested communication device.