Audio and Vibration Testing Solutions

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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.

Audio and Vibration Testing Solutions

PCI/PXI-9527

24-Bit High-Resolution Dynamic Signal Acquisition and Generation Module

PXI specifications Rev. 2.2 compliant (PXI-9527)
24-bit Sigma-Delta ADC and DAC
2CH simultaneous sampling analog input & 2CH simultaneous updated analog output 432 kS/s maximum sampling rate with software programmable rate
Programmable input range: ±40 V, ±10 V, ±3.16 V, ±1 V, ±0.316 V
Programmable output range: ±10 V, ±1 V, ±0.1 V
AC or DC input coupling, software selectable
Trigger I/O connector for external digital trigger signal
Supports IEPE output on each analog input, software-configurable
Supported OS: Windows 7/8 x64/x86, Linux
SDK Compatibility: LabVIEW, MATLAB, C/C++, Visual Basic, Visual Studio.NET Software utility: Audio Analyzer

PCIe/PXIe-9529

8-CH 24-Bit High-Resolution Dynamic Signal Acquisition Module

24-Bit Sigma-Delta ADC
8 simultaneous analog inputs
192 kS/s maximum sampling rate
±1V, and 10V input ranges
110 dB dynamic range
Antialiasing filters
AC (0.5Hz), or DC coupling, software selectable
IEPE – 4mA, software configurable
Supported OS: Windows 7/8 x64/x86, Linux
SDK Compatibility: LabVIEW, MATLAB, C/C++, Visual Basic, Visual Studio.NET

USB-2405

4-CH 24-Bit 128kS/s Dynamic Signal Acquisition USB 2.0 Module

Hi-Speed USB 2.0, and USB bus power
24-bit Sigma-Delta ADC with built-in anti-aliasing filter
4CH simultaneous sampling analog input, up to 128kS/s
AC or DC input coupling, software selectable
Analog or digital triggering
Supports 2mA excitation output on each analog input channel for IEPE sensor measurement Full auto-calibration
Supporting Time-Frequency analysis software -Visual Signal
Supported Operating System: Windows 7/8 x64/x86, Linux, and MAC
SDK Compatibility: LabVIEW, MATLAB, C/C++, Visual Basic, Visual Studio. NET

Application-oriented Dynamic Signal Acquisition Modules for New Generation Audio and Vibration Measurement:

Based on various bus standards, ADLINK’s Dynamic Signal Acquisition (DSA) modules are specifically designed for audio, noise, and vibration measurement applications. Featuring up to 432 kS/s sampling rates, 24-bit resolution, and IEPE signal conditioning, the series delivers highly accurate signal acquisition and easy connection to microphone or acceleration sensor for component testing. ADLINK further provides a wealth of industrial-grade computer and PXI platforms enabling customers to choose the products most suitable to their own audio and vibration applications, speeding system development.

Features

Complete sound and vibration systems in PXI, PCI, and USB
24-bit ADCs and DACs with up to 118 dB dynamic range
Up to 432 kS/s AI and up to 192 kS/s AO
AC/DC coupling, IEPE conditioning, anti-aliasing filters, and auto calibration Flexible multi-module synchronization

HiFi Mobile Phone Testing Items:

Noise level testing: Acquisition of earphone output noise signals to verify compliance with specification, with standard values varying according to mobile phone model, normally 3 to 5μVrms.

THD+N testing: Acquisition of earphone output single-tone signals at different frequencies (20Hz to 20KHz) to verify compliance of THD+N with specification, with standard values will varying according to mobile phone model, normally -90dB to -100dB.

For HiFi mobile phone audio quality testing, ADLINK provides the PCI-9527, connecting the phone’s left and right sound tracks through
its two analog input channels. After input measurement range is set at ± 0.316V, the PCI-9527 measures earphone output and compares the acquired values with original design specs, to evaluate DUT noise level. Further adjusted is input measurement according to the mobile phone’s THD+N testing requirement, and earphone output single-tone signals are then tested at different frequencies (20Hz to 20KHz) using FFT to obtain THD+N measured values. Finally, DUT is tested for compliance with HiFi design standards.

Car Navigation Audio Testing

To secure a position in the in-vehicle infotainment and navigation market, manufacturers are required to provide superior audio and video capabilities, while optimizing audio reproduction quality. What is required is a cost-efficient audio testing solution.

Application Requirements

In-vehicle infotainment and navigation device manufacturers require audio testing systems that can quickly measure four audio output channels (including multiple speakers in various vehicle locations), analyzing audio quality and identifying device defects. Previously, manufacturers have largely relied on manual testing requiring extended testing times, utilizing expensive testing instrumentation, often with fewer output channels (usually only two), which further extends the duration of testing events. Lower testing costs and quicker processing turnaround are, accordingly, beneficial, with specific requirements including:

Quick testing system setup providing a variety of automatic testing programs on production lines Increased bandwidth to shorten testing cycles and improve test efficiency
Reduced cost of testing equipment

Car Navigation Audio Testing Items:

Audio Output Level
Crosstalk: <60 dB (1KHz)
Frequency Responses: ±3dB (20Hz to 20KHz) Signal-to-Noise Ratio (SNR): 70dB (1KHz)
Total Harmonic Distortion + Noise (THD+N): -60dB (1KHz) Dynamic Range: 70dB (1KHz)