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 2009-5-2 23:17  1758 7 7 分类: 测试测量

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Document Type: Tutorial
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Publish Date: Sep 8, 2008

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Audio Test Technical Library

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Overview

Audio test applications are concerned with the quality of sound from devices including speakers, amplifiers, and microphones. Engineers perfrom linearity characterization, distortion measurements, sound quality analysis, rub and buzz, and others. Audio measurements are highly demanding, requiring high-quality signal acquisition, complex scaling, extensive analysis, and multiple graphical presentations.

	Hardware and Software Products An overview of National Instruments tools for audio test			Tutorials and White Papers Understand the technologies and techniques behind audio analysis and test

	Webcasts and Interactive Demos View videos and presentations			Example Programs and Projects Download code for implementing audio test systems

	Case Studies Learn how audio test designers and engineers have implemented systems			Ready-to-Run Solutions and System Integrators Explore standardized applications customized solutions for audio test

Hardware and Software Products

Explore the hardware and software products from NI designed for audio test systems.

Featured Resource: NI 4461 - 24-bit input and output with 118 dB dynamic range

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Tutorials and White Papers

These tutorials and white papers provide information on architecting audio test systems.

Featured Resource: Audio Measurements Made Easy with LabVIEW

Production Line Audio Testing - Advanced Concepts and Applications - This tutorial describes how to perform audio testing by explaining the theory and giving practical examples
Audio Test Performance and Accuracy Benchmarks - Benchmarks for audio measurement uncertainty and performance
Audio Test System Configurations - Considerations and three example configurations for building an audio test system
Rub & Buzz and High Order Harmonic Analysis Tutorial - Harmonic analysis often used in audio and electroacoustic applications, focusing on higher order harmonics, typically greater than 10th order.
Class D Amplifier Testing - AES17 Filters - Class D amplifiers are tested and validated like other types of amplifiers, however, a low pass filter for the high frequency switching components is often used on the output.

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Webcasts and Interactive Demos

Videos and presentations from NI and other engineers covering various aspects of audio test.

Featured Resource: Audio Fundamentals 101: Analog Audio Test and Measurement

Sound & Vibration Summit Webcast: Multi-tone Audio Analysis - Presented by Joe Gerhardstein of Sirius Satellite Radio, learn how to perform multitone audio analysis using a technique called synchronous FFT
Electroacoustics 101 with SoundCheck - Covering electro-acoustic and audio electronics test including frequency response, phase, sensitivity, distortion, directivity, impedance, rub and buzz, and Thiele-Small parameters
Introduction to the Sound and Vibration Assistant - A three-minute video overview of the easy-to-use test and audio analysis software included with the NI Sound and Vibration Measurement Suite

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Example Programs and Projects

NI LabVIEW code and NI Sound and Vibration Assistant projects available for download for audio test analysis.

Featured Resource: Swept Sine Frequency Response (DAQmx)

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Case Studies

Read how other acoustic engineers and audio test system designers have implemented customized test solutions with National Instruments tools.

Audio Measurement Using PXI-4461 - Engineers developed a flexible, replacement system for a traditional audio analyzer for manufacturing test PXI-Based Automated Measurement System for New 8.1ch DSP Power Amplifier - A production line test system for Sony's 8.1ch DSP Power Amplifier Back to top >>
Ready-to-Run Solutions and System Integrators
		These products and solutions from National Instruments partners and integrators provide out-of-the-box applications for automated audio test.
AudioMASTER by microLEX - Automated analysis and test of audio components such as hearing aids, headsets, telephones, and other transducers with a simple task-oriented user interface SoundCheck by Listen, Inc. - A flexible software-based audio test system, including a spectrum analyzer, real-time analyzer, signal generator, multimeter, and oscilloscope Back to top >>

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This tutorial (this "tutorial") was developed by National Instruments ("NI"). Although technical support of this tutorial may be made available by National Instruments, the content in this tutorial may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this content with each new revision of related products and drivers. THIS TUTORIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).