Why are almost all audio measurements made using a sine wave as the test or stimulus signal? Why is audio test equipment uniformly focused on sine waves?

Fast Fourier Transform (FFT) analysis, which converts signals from the time domain to their frequency domain equivalent, is incredibly useful in audio test.

THD and THD+N. They are closely related, but there’s an important difference between them that is often overlooked.

Users can automatically transfer the measured directivity data to a contour plot in a third-party software package called VACS.

Using APx500 software version 5.0.1, users can configure the analog generator to stay in a fixed output range. This is useful for testing acoustic devices and electronic devices with sensitive input stages.

Using version 5.0.1 of APx500 software (released April 2, 2019), users can configure the analog generator to stay in a fixed output range. This is especially useful for testing acoustic devices, and some electronic devices.

There are a couple of things that make audio signals and their measurement unique. From the human ear to the total amplitude range of audio signals, we find one significant truth.

With the release APx500 software version 5.0, AP has added transfer function measurement capability, enabling cross-spectral analysis of arbitrary, broadband signals.

Join AP for the first time at “the largest audio/visual technology event in the USA,” InfoComm 2019. We’ll be demonstrating a variety of audio test applications there, and at AISE 2019 in Florida, USA.

In addition to improved performance specs, the new B Series APx555 offers an ADC Test Mode software option which provides VBias, a common mode DC Bias.