ADLINK Technology - ADLINK Technology

As smart phones and tablets continue to gain popularity, multimedia content is becoming more important to consumers all the time. To provide superior multimedia experience, device innovation is not limited to improvement of display quality and size, but also audio quality. As a result, integration of more and better quality electro-acoustic components (i.e. stereophonic loudspeaker and noise-canceling microphone) is a priority in product development. With audio quality recognized as an important factor in gaining market share, manufacturers must maximize the effectiveness of their audio testing systems to ensure product quality.

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.

Audio Loop Back Testing Requirements

Ease system integration and shorten testing cycle while improving testing efficiency
Maximize accuracy and consistency of test results
Quick testing system building and auto-execute test items
Meet automated production line requirements

Audio Loop Back Testing Items:

Loop frequency/distortion response test from headset MIC to earphone left/right channel
Loop frequency/distortion response test from headset MIC to speaker
Loop frequency/distortion response test from built-in microphone to earphone left/right channel

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ADLINK Solution

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.

Benefits

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.

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