ADLINK's PXI-9527, a 24-bit high dynamic signal acquisition card provides an excellent solution for audio loop testing of smart phones. As shown, the DUT audio input/output connects to the PXI-9527 via analog input/output channels, forming the testing loop. Via the mobile phone control program, the PXI-9527 analog output channel generates a swept sine wave from 20Hz to 20KHz, varying with mobile phones type, after which the signals are transmitted back to the PXI-9527's analog input channel, embodying test results of frequency response and distortion response after Fast Fourier Transform (FFT) processing, determining the DUT's audio quality. The PXI-9527 provides two analog input channels and two analog output channels capable of simultaneously detecting 3.5mm earphone audio circuit, speaker and microphone to fully satisfy multiple electro-acoustic device testing requirements. Expandability allows users to easily and quickly reconfigure test settings, such that if the number of electro-acoustic components to be tested changes, simply adding a switch or installing another PXI-9527 handles the variation, with no need to redesign the entire test system. The PXI-9527 also provides IEPE current output on each analog input channel, so no external power supply is required to power the microphone sensor, thereby simplifying system structure.
ADLINK's mobile phone audio testing solution provides more efficient implementation of audio testing systems and significantly reducing overall testing costs. The single-card solution providing complete signal output and collection rather than unidirectional and single-tone tests (only recording or broadcasting), significantly shortens the test cycle. With 24-bit precision, low distortion and low noise specifications, the PCI/PXI-9527 can stably and synchronously acquire AI and AO signals to ensure the accuracy and consistency of measurement results. Support for C/C++, .NET, LabVIEW, and diverse SDKs allows quick development of customized audio testing systems and flexible integration of other testing items. ADLINK also provides ready-to-use audio testing software enabling effortless testing system customization, reducing software development and system integration time and costs.