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Audio Loop Back Testing
Looping back audio enables fast, accurate, and consistent tests for electro-acoustic components like smart phones. This helps create the best audio quality so that you can have a superior multimedia experience with your device’s built-in speakers. By simulating electronically reproduced input/output signals, it enables systems to more effectively detect and prevent audio quality issues such as clipping, distortion, echo or noise.
ADLINK’s PXI-9527, a 24-bit high dynamic signal acquisition card, is an excellent solution for audio loop back testing. The testing loop is formed by connecting the DUT audio to the PXI-9527 via analog input/output channels. The test checks the quality of sound by converting an incoming signal into a swept sine wave, which is then transmitted back to its analog input channel. It has two analog input channels and two analog output channels which lets it simultaneously detect audio signals from 3.5mm earphones, speakers, and microphones. The PXI-9527 also has current output on each analog input channel, so you don't need a separate power supply. This makes it perfect for testing multiple electro-acoustic devices without having to redesign the entire system. ADLINK provides simple solutions for quality audio.
Application Requirements
In mobile phone manufacturing complete audio testing is required for production lines, to quickly check audio interfaces including 3.5mm earphone circuit, speaker, and microphone, to identify defective products before shipment. Previously, manufacturers have used an external audio analyzer which is bulky, expensive, and difficult offers little support for testing program development due to a lack of easy to use SDKs. The system adds time to production by minimal integration with other programs and difficulty in meeting test automation requirements. Alternatively, a sound card can be used in testing, although only for lower audio distortion/noise specifications. The solution can only, however, detect basic audio function, with no simultaneous recording and broadcast functions, affecting consistency and stability of test results and showing relatively high false rates. The lower audio distortion/noise specifications are unable to accurately generate a frequency response curve and distinguish the audio quality differences (good or bad) according to the actual audio performance of mobile phone.
ADLINK’s PXI-9527, a 24-bit high dynamic signal acquisition card, is an excellent solution for audio loop back testing. The testing loop is formed by connecting the DUT audio to the PXI-9527 via analog input/output channels. The test checks the quality of sound by converting an incoming signal into a swept sine wave, which is then transmitted back to its analog input channel. It has two analog input channels and two analog output channels which lets it simultaneously detect audio signals from 3.5mm earphones, speakers, and microphones. The PXI-9527 also has current output on each analog input channel, so you don't need a separate power supply. This makes it perfect for testing multiple electro-acoustic devices without having to redesign the entire system. ADLINK provides simple solutions for quality audio.
Application Requirements
In mobile phone manufacturing complete audio testing is required for production lines, to quickly check audio interfaces including 3.5mm earphone circuit, speaker, and microphone, to identify defective products before shipment. Previously, manufacturers have used an external audio analyzer which is bulky, expensive, and difficult offers little support for testing program development due to a lack of easy to use SDKs. The system adds time to production by minimal integration with other programs and difficulty in meeting test automation requirements. Alternatively, a sound card can be used in testing, although only for lower audio distortion/noise specifications. The solution can only, however, detect basic audio function, with no simultaneous recording and broadcast functions, affecting consistency and stability of test results and showing relatively high false rates. The lower audio distortion/noise specifications are unable to accurately generate a frequency response curve and distinguish the audio quality differences (good or bad) according to the actual audio performance of mobile phone.
