Forum Replies Created
25 June 2022 at 7:57 am #490
Thanks, we’ll add a comma to line ends.
I’ve been testing here also. For me Q-SYS Designer (9.4.2) is only loading the first line.
Can you confirm that Q-SYS Designer is loading all four lines for you? If the QSYS Designer Custom IIR Block doesn’t look like FIR Designer, and if it has no more than ~180 of phase change across the plot, then it’s only loading the 1st line.
Their support page
shows that the block should be capable of loading multiple lines.
I realised I needed to set the “Section Count” to the number of rows. With this set, all the lines of the CSV load correctly for me here.
EA Support17 May 2022 at 5:55 pm #475
The SMAART API grabs the transfer function as complex frequency domain values, with the frequency resolution determined by the current SMAART FFT size. SUT delay causes high phase slope in the transfer function. Further time averaging and frequency smoothing cause the delay to be blurred such that when the TF is converted back to an impulse response, the peak may not be distinct. The only alternative is to grab the impulse response through the SMAART API, and not the TF frequency values. I don’t think the API currently supports this – I’ll check with Rational – so in the meantime you’ll just have to remove SUT delay in SMAART.
17 May 2022 at 11:29 am #472
- This reply was modified 1 year, 9 months ago by EA Support.
BTW in the meantime you can open additional windows (using Project menu -> New Window), load the averaging session file and select a different averaging mode. This way you can compare different modes in different windows.
EA Support22 April 2022 at 7:24 am #466
Sorry, I don’t understand the question. Using boosts or cuts, to push a response toward target, is completely up to the user, e.g. the Mag Adjust tab (and if the target response is visually too high, it can be lowered using the “Zero Adjust” slider). The Auto Mag tab inherently does both boosts and cuts but we are looking at algorithmic changes to give some user control of boosts and cuts independently.
EA Support16 April 2022 at 12:06 pm #463
Suggestion noted; thanks.
In short, the wavelet view gives a “frequency versus time” map of the loudspeaker response. The wavelet view of an ideal impulse is shown by default when the program is started. Once a measurement is loaded on the import tab, the waveleft view shows the frequency versus time map of the measurement. If the loudspeaker has, for example, “ringing” at various frequencies, the wavelet view will show patches to the right of the ideal wavelet shape at those frequencies. IIR crossovers, all-pass filters and other high-Q filtering will all cause some time smear in the loudspeaker response to the right of the “ideal” shape. Whether this is audible or not is somewhat subjective and varies with frequency; since the human auditory system performs somewhat differently at different frequencies.
With FIR filtering it’s possible to create mixed phase filters that undo some of the phase changes that cause the time smear. For example, try using auto-mag and auto-phase on a loudspeaker measurement and watch how the wavelet view changes. Or, without any measurements loaded, set channel 1 to a low-pass LR 4th order crossover filter and channel 2 to a high-pass LR 4th order crossover filter, so that the combined magnitude sums flat. What remains is a phase change due to the crossover filter. Note what the phase change looks like on the wavelet view.
For more detailed info, maybe google “wavelet analysis of loudspeakers.” Don Keele has one AES paper on the topic. A related analysis tool is the “waterfall plot” and you may find useful information on this also.
EA Support16 April 2022 at 11:43 am #462
Currently IIR settings need to be copied manually across into the Linea Research control software. (There is no export/import path to move the filters to Linea Research.) We have been in discussions with Linea Research about making this process easier, but I can’t give any timeline.
EA Support2 April 2022 at 1:01 pm #457
That’s correct; there’s no target phase on the IIR tab right now. And yes, we should add this. (It’s on the TODO list.)
In the meantime, you could open “Second View” and watch the phase on another tab. For example on the Phase Adjust or Auto Phase tab.
EA Support14 March 2022 at 4:06 pm #452
We’ve taken a look at the Processor Editor software.
Regarding the IIR filtering, many brands have different interpretations of Q (or BW) in their parametric and shelf filters. And some have different frequency interpretations for Bessel filters.
We may consider adding this processor to our IIR filter modes, however it can take many months to work out the math for a new IIR mode and create all the conversion functions to/from all the existing Branded IIR modes that we have in our products.
In the meantime, I sugges experimenting with the filters in each of the existing IIR modes to see which ones may closely match the T.racks.