Forum Replies Created

Viewing 15 posts - 16 through 30 (of 125 total)
  • 14 July 2022 at 6:13 pm #518

    Hi Eddie,

    >> Doesn’t the latency increase if I create only the Magnitude

    No. On the Auto Mag tab you have selected a minimum phase filter response. This puts the FIR filter peak at time=0, which you can see on the Export tab and provides essentially no latency. Can I suggest you research FIR filter basics? We have a white-paper at

    FIR Filter Guide

    while you may find helpful. Also take a look at the tutorials on

    FIR Filter Design Tutorials

    >> I use 8 measuring microphones to average the response of the room.

    The averaged measurement on the Import tab still looks too detailed to be useful. I’d suggest applying some smoothing, either on the Import tab or on the Auto Mag tab.

    Best regards,
    EA Support

    14 July 2022 at 4:50 pm #516

    Hi,

    I’ve taken a look at your FIR Designer project file. It generates a minimum-phase FIR filter so the approximate delay through the filter is 0ms and is why you’re seeing no roughly the same latency with the FIR on & off.

    Also, it’s generating a FIR filtering using the Auto Mag process with no smoothing. This is generally not a good idea. Fine resolution filtering like this may make the measurement position sound better, but will sound a lot worse in all other locations. We recommend some measurement averaging and Auto Mag smoothing.

    Best regards,
    EA Support

    4 July 2022 at 11:24 pm #510

    Like we suggested, ensure the measurement doesn’t have significant bulk delay. Then you can apply variable smoothing and transfer to FIR Designer as freq/mag/phase TXT with reasonable confidence.

    Best,
    EA Support

    4 July 2022 at 10:41 am #507

    It looks like FIR Designer matches REW in mag and phase. The measurement clearly has very high phase slope and thus significant bulk delay. This bulk delay should be removed in the measurement process if phase is to be used in any subsequent filter design. FIR Designer does its best to create an IR from the freq/mag/phase TXT format but using freq/mag/phase looses information when the measurement has very high phase slope. Better to export the measurement IR directly and load this into FIR Designer.

    BTW, from a display perspective, in Preferences you can uncheck “Show phase plot wrapping” to remove the vertical lines between when the phase wraps.

    Best,
    EA Support

    2 July 2022 at 11:10 am #503

    Thanks. Our apologies. In our haste to get an update out for you the change made it into the mac build but not the Windows build.

    2.4.7 is now available and we’ve confirmed that the commas are there.

    Best regards,
    EA Support

    29 June 2022 at 8:19 am #501

    Thanks!

    BTW As you’ve probably noticed, there’s no error checking and feedback to the user from Q-SYS Designer. I was able to load 1, 2, 3, 4 or 5 value lines which gave obviously wrong filter behaviour.

    27 June 2022 at 2:20 am #499

    Noted.

    EA Support

    27 June 2022 at 2:19 am #498

    Noted.

    EA Support

    25 June 2022 at 10:12 am #492

    We just released 2.4.6 with a comma at the end of every row of the QSC Q-Sys CSV file.

    Best,
    EA Support

    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
    https://q-syshelp.qsc.com/Index.htm#Schematic_Library/filter_IIR.htm
    shows that the block should be capable of loading multiple lines.

    Best,
    EA Support

    EDIT

    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.

    Best,
    EA Support

    • This reply was modified 3 months, 1 week ago by EA Support.
    • This reply was modified 3 months, 1 week ago by EA Support.
    24 June 2022 at 11:58 am #485

    Noted.

    Best,
    EA Support

    11 June 2022 at 6:30 am #483

    We’ve confirmed the bug. It will be fixed in the next update.

    Thanks,
    EA Support

    21 May 2022 at 7:35 am #479

    Thanks for letting us know. We’ve just updated the update scripts on the website. If you restart FIR Designer, it should give you a link now to 3.3.3.

    Best regards,
    EA Support

    17 May 2022 at 5:55 pm #475

    Hi Johnson,

    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.

    Best regards,
    EA Support

    • This reply was modified 4 months, 3 weeks ago by EA Support.
    17 May 2022 at 11:29 am #472

    Suggestion noted.

    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.

    Best regards,
    EA Support

Viewing 15 posts - 16 through 30 (of 125 total)