Call Test Signal Conversion for Reliable Communication Chips
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Solution Overview
Problem
Existing voice call testing methods, such as using DTMF codes or voice recognition, are inadequate for communication chip testing during the development phase due to reliability issues and susceptibility to noise interference, leading to inaccurate test judgments.
Innovation Solution
A system and method utilizing a signal generating module to create a first format calling signal, a testing module to convert and transmit it as a second format, and a signal processing module to compare the signals for call status determination, employing fixed and obvious characteristics to enhance stability and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If DTMF code is used as voice source for call testing, then the test can be automated, but the test reliability deteriorates during development phase because terminal DTMF functionality may be defective
Solution Approach 1:
The patent introduces an external test server as an intermediary that generates and sends DTMF tones directly to the terminal under test, bypassing the need for the terminal's own DTMF generation functionality. This mediator approach ensures that the test signal source is reliable and independent of the device being tested, resolving the contradiction between automation and reliability during development phase.
2Reliability
If voice recognition technology is used to detect call content, then real voice signals can be simulated, but the system complexity and cost increase due to large code size and noise susceptibility
Solution Approach 1:
The patent extracts only the essential characteristics of voice signals (frequency, duration, amplitude patterns) rather than implementing full voice recognition with large codebases. By taking out only the necessary detection features and ignoring complex linguistic analysis, the system achieves reliable voice signal detection while maintaining simplicity and reducing noise susceptibility.
3Adaptability or versatility
If complex voice recognition system is deployed, then real voice simulation is achieved, but the maintenance cost and code size become excessively large
Solution Approach 1:
The patent applies local quality by implementing only the specific voice signal processing capabilities needed for call testing (detecting presence, frequency, and basic patterns of test tones), rather than deploying a comprehensive voice recognition system. This localized approach to functionality reduces code size and maintenance costs while maintaining sufficient adaptability for the intended testing purposes.
Data Source
AI summary
A call test system sets up a call between a calling terminal and a called terminal. The call test system generates an original signal in a first format and converts it to a second format which can be stored in a memory of the calling terminal. The calling terminal sends the signal in the second format over the channel to the called terminal. The called terminal stores the received signal in the second format and sends it to the call test system. The call test system converts the received signal in the second format to the first format and compares it with the original signal in the first format. The comparison may be in the time domain and/or the frequency domain.