When AP’s engineers began designing the APx Series, they saw that a new platform was needed to maintain the innovation curve defined by the System One in 1984 and the System Two in 1995.
APx was designed from the ground up with a next generation UI to allow engineers and production testers to get to work quickly and easily. From super-fast measurements to rich graphic reports and sharable project files, everything you need to test audio is available at the click of a mouse.
New measurements have also been introduced to stay ahead of the changing needs of our customers.No other analyzer in the world is faster or easier to use.
Simple dialogs allow for easy configuration of filters and advanced settings. Repetitive bench tests across multiple signal paths can be automated with the measurement sequencer; level, scope, and FFT signal monitors can be pulled up for real-time analysis. APx can play custom waveforms (square waves, pink noise, etc.) and external source mode allows the testing of playback-only devices such as CD, DVD and MP3 players. Engineers working with power amps can measure continuous maximum output and peak maximum output automatically, view power spectrum graphs with a regulated frequency sweep and take other measurements as specified by the CEA-2006 and CEA-490A standards.
One click measurements & automated sequences
Multichannel, real time signal monitors
Saveable, shareable Projects
Integrated reports for sharing results
Multiple channel configurations
Digital Error Measurements
Any device that just passes through digital streams (bitstream mode) strives to be bit-accurate. However, mistakes can happen. Devices may unintentionally truncate data, introduce dither, scale the signal, or convert the sample rate. These errors may be hard to detect with a traditional THD+N measurement, but they can cause havoc for devices receiving the corrupted data later in the signal path.
APx’s bittest calculates the Digital Error rate by taking a pseudo-random waveform with values uniformly distributed between plus and minus full scale and performing a bit-for-bit comparison between the data received from the device under test and the original file. A device passing the data correctly will have a 0% error rate.
The digital data analyzer in 2700 Series and ATS-2 have both provided similar functionality for years. However, one key innovation of the APx Digital Error Rate measurement is the ability to test the encoded audio streams typical in multichannel audio.
The APx’s technique allows both lossless and (through some clever signal manipulation) lossy streams to be tested, crucial for evaluating whether an HDMI source can truly handle all the different formats that may be requested by an HDMI sink.
Fig 1: Average error rate of a device unintentionally truncating the last four bits of a 24-bit word.
“Testing was an absolute bottle-neck. Now our APx is running literally all day long and we’ve more than halved our test time. We like the way it works. .”
-- Morris Kessler, President | Amplifier Technologies, Inc