… Option Key Module fastened over the Software Options port on the back panel of the instrument, as shown in Figure 1. The module has a label indicating which options were installed when it left the factory.…
… similar to full reference. PESQ uses the full reference method to evaluate voice quality, as shown in the block diagram below.
Fig 2PESQ block diagram (courtesy of OPTICOM GmbH).
PESQ In APx500
…
… easy to observe “stuck” bits in digital hardware. The walking bits waveforms will also show no errors when passed through a bit-accurate system. Walking Zeros In the Walking Zeros waveform, all…
… by the rms level of the first nine harmonics. In the Distortion Product Level view, the bars show rms level. In the Distortion Product Ratio view, the bars represent the ratio of the rms level of the…
… EQ curve, and an output file. Some sample .csv files are included with the utility as examples to show the proper format. The data export feature in APx will also create a properly formatted .csv files.
…
… Accuracy is ±0.0003% (3 PPM), and the output impedance is 50 ohms.
Accessing the DSIO Clock
As show below, the clock signal appears on pin 5 of the Digital Serial I/O Receiver HD15 jack. Pins 2, 4, 6, 7,…
… invoked to run in the background by adding a Run External Program step in the project navigator, as shown in Figure 3.
Fig 3 AV Sync Run External Program Step.
A controlled test file with…
… to the desired position. As the cursor is dragged, the value in the Time Window indicator updates to show the time window cursor position.
Figure 2. The specify time window dialog.
The time window cursor…
… of APx500 v2.4 which Audio Precision staff are demonstrating on their stand (1503) at the AES show, Munich, from May 8-10, 2009. The full version of APx v2.4 is due to be released later this year.
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Using APx500 Software and an APx515B Audio Analyzer, Eric Schultheis demonstrates a series of audio measurements, providing insight into device performance.
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