Signal acquisition card for speaker testing

25 July 2012 Computer/Embedded Technology

Historically, testing of acoustic response in audio playback devices has required critical performance analysis conducted by specialised audio engineers. In addition to design verification, acoustic response testing is also important in production line testing of multimedia devices.

Currently, many multimedia devices such as MP3 players, mobile phones and car stereos utilise speakers. Accurate frequency response measurement and detailed harmonic distortion analysis during speaker production testing require high resolution dynamic signal acquisition modules with flexible analog input/output function and high dynamic range.

AO output, for example, generating a multi-tone or stepped sweep sine signal, may be employed as a stimulus for a speaker. To convert speaker output to a voltage signal, a calibrated microphone may be employed as a sensor. AI input can then acquire the signal output from the microphone and perform a fast Fourier transform (FFT) to analyse the measured audio signals, providing frequency and impedance response and harmonic distortion analysis.

The ADLINK PXI-9527 features a 2-channel, 24-bit simultaneous sampling analog input. The Sigma Delta ADC provides up to 432 KSps sampling rate and high resolution, ideally suiting it for higher-bandwidth dynamic signal measurement.

The sampling rate can be adjusted by setting the onboard DDS clock source to an appropriate frequency. All channels are sampled simultaneously and accept inputs in the range of ±40 V to ±0,316 V. The analog input supports software-selectable AC or DC connection, and 4 mA bias current for integrated electronic piezoelectric (IEPE) sensors.

For more information visit www.adlinktech.com

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