Audio Baseband Interface Loopback Testing Without External Equipment
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Solution Overview
Problem
Current mobile devices with two audio baseband chips face challenges in testing the interface between these chips, requiring additional hardware and expensive external test equipment, as well as enabling radio communication for proper testing.
Innovation Solution
A method is developed to internally verify the interface between two audio baseband circuits using a Bluetooth protocol radio test command to configure one chip into loopback mode, transmitting a test signal and comparing it to the original signal, eliminating the need for external equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external test equipment and additional hardware are used to test the interface between audio baseband chips, then testing capability is achieved, but device complexity and cost increase
Solution Approach 1:
The system performs self-testing by configuring one audio baseband circuit in loopback mode to receive and process test signals generated by the other circuit. This eliminates the need for external test equipment and additional hardware, as the circuits test themselves using their existing interface infrastructure.
Solution Approach 2:
The existing audio baseband circuits are made multi-functional by enabling them to operate in both normal communication mode and test mode. The same interface and circuitry used for audio processing are repurposed for self-testing, eliminating dedicated test hardware requirements.
2Measurement precision
If radio test equipment and acoustic test equipment are set up to properly test the interface, then accurate testing is achieved, but device complexity and setup requirements increase
Solution Approach 1:
The audio baseband circuits generate and analyze test signals internally without requiring external radio test equipment or acoustic test equipment. The loopback configuration allows the receiving circuit to capture and evaluate the transmitted signal, achieving accurate interface verification through self-contained testing.
Solution Approach 2:
The testing function is extracted from external specialized equipment and integrated directly into the audio baseband circuits themselves. By removing the dependency on external test equipment, the solution simplifies the overall system while maintaining testing capability.
3Reliability
If hardware is added to the circuit board to facilitate testing of audio baseband chips, then testing capability is improved, but board space and manufacturing complexity increase
Solution Approach 1:
The circuits utilize their existing interface hardware to perform self-testing, eliminating the need for additional test hardware on the circuit board. This reduces board space requirements and simplifies manufacturing processes while maintaining comprehensive testing capability.
Data Source
AI summary
In a mobile device having a primary baseband circuit and a secondary baseband circuit and an interface between the primary baseband circuit and a secondary baseband circuit, a method for testing the interface and primary and secondary baseband circuits comprising the steps of: setting the secondary baseband circuit into a loopback mode; sending a test signal from the primary baseband circuit to the secondary baseband circuit; receiving at the primary baseband circuit a second signal, the second signal being the first signal looped back from the secondary baseband circuit; and comparing the second signal with an expected result.