… objective is to create a simple application that opens the APx control software and has buttons to show or hide the APx GUI, open a specific APx Project file, and run the APx measurement sequence defined in…
… from the results. These are the energy time curve (ETC) and the impulse response (IR). Both show the sound pressure level at the microphone as a function of time. As can be seen, the initial arrival of…
… 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…
… it. This makes the SYS-2722 ideal for making audio-frequency impedance measurements.
This article shows how to make impedance measurements using SYS-2722, a test jig, and a supplied macro. The jig can be…
… 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 is…
… display to help pinpoint specific problems such as clipped words or dropouts. Additional results show average delay, delay vs. time, and the reference and the acquired waveforms.
The PESQ/POLQA Average…
… 2 and 1 ohm loads. If in doubt, run the measurement without them first.
Results: This tab will show the measurement data after running the Power Cube measurement. From this page, you may export the data…
… used.
The spectrum of a signal containing discrete tones combined with band-limited noise is shown in Figures 1 and 2. In Figure 1, the spectrum was measured without an FFT window (window = None). Note…
