AP - The Recognized Standard In Audio Test

The acoustic response measurements in APx audio analyzers are for audio engineers who need high performance acoustic as well as electronic audio test in non-anechoic environments. On the production line, APx’s ease-of-use and high speed are ideal for both speaker OEMs and electronics manufacturers conducting quality assurance of drivers from third party vendors.

Example devices under test include loudspeakers and PA monitors as well as the drivers found in consumer products such as home theatre systems, portable DVD players, iPod docks, clock radios, TVs and laptops.

Easy Test Setup

Setting up acoustic test in non-anechoic spaces is challenging because sound reflections from the walls and floor interfere with the measurement. Like other non-anechoic acoustic test solutions, APx uses a time-gated logarithmic sweep to measure the impulse response of the acoustic device. Unlike other solutions however, AP’s interface for defining the time gate is fast and easy: users simply drag a cursor over the impulse response graph or energy time curve and APx recalculates all the derived measurements in real time.

Fig 1. Energy Time Curve graph: The system’s energy dispersal in time. Useful for viewing the signal alignment, and for inspecting the arrival of the direct signal, early reflections, and spurious outputs caused by leaks or resonances in the speaker enclosure.

 

Complete Acoustic Characterization In Six Seconds

APx automatically calculates all the key acoustic response measurements including level, frequency response, phase, distortion, and group delay. In all, 14 graphed measurements are returned in six seconds. In addition, APx offers synchronous averaging and Nth-octave smoothing. The results are available on screen, can be printed to PDF or exported in table format for use in other applications. Like all APx measurements, acoustic response can be part of a larger test sequence or controlled externally from an application such as LabVIEW.

Fig 2. Level and Distortion graph: Both the level vs. frequency and the distortion vs. frequency of the speaker. It’s especially useful to have separate traces for the second and third harmonics.