Best wishes to you from Audio Precision
Notes from the Test Bench
By Bruce Hofer, Chairman & Co-Founder, Audio Precision
From all of us at AP, we wish you and your family a happy holiday season. We hope you also enjoy our holiday card above (you can print it to display on your bench)—the multi-colored tree made possible by user-assignable appended sweep colors, a new feature available in APx500 v2.9, shipping in January!
Output: Appended Sweep Colors in APx500 v2.9
In January, AP will release APx500 version 2.9. One of the most asked-for features in APx500 has been the ability to select different line colors and styles when appending acquisitions to a graph. The new colors tab in the Project/Sequence Properties window provides this capability. Next month, we’ll look at the other features in 2.9, including some new sweeps, saving acquisition data inside projects, and making quasi-peak noise measurements.
Fig 1 The new Colors tab in the Project/Sequence Properties.
Using a spreadsheet-like interface, the color, type, and thickness of the line traces in each “cycle” may be selected from the toolbar at the top. Cycles generally correspond to acquisition Data Sets, and each appended acquisition uses the next cycle. However, if the number of acquisitions exceeds the number of cycles, the cycle sequence starts over again. You may have up to 16 cycles in a project. The numbered rows refer to analyzer channels. Sixteen channels are always listed—settings for channels that are not being utilized are simply ignored.
Fig 2 Highlighting a row or column lets you change multiple cells at once.
The color/styles selector also includes the ability to reorder columns, to automatically choose colors, and to export and import schemes from one project to another. Settings apply universally to all inputs/outputs and signal paths in a project.
To illustrate the new feature in action, we’ve provided the following example, using the settings in Figure 1 above. The graphs below show the cross-over point from subwoofer to left-front speaker on a 7.1 channel receiver, using three different cross-over frequencies.
Fig 3 First sweep, crossover set to 120 Hz.
Fig 4 Second sweep, crossover set to 100 Hz.
Fig 5 Third sweep, crossover set to 80 Hz.
Each acquisition uses its own unique color/style settings. When all three acquisition data sets are shown simultaneously on the graph, we can now easily distinguish them.
Fig 6 All three sweeps (data sets).
That’s all for now. Next month we’ll review the new sweeps and other features.
Test Results: AP News & Events
©2011 Audio Precision, Inc.