Should I use HPF and bandwidth

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  • February 17, 2014 at 9:39 pm #1737
    jonnyc
    Member

    I am running a internet radio station not on fm, I stream at 192kbps mp3.  Should I use HPF & Bandwidth or turn HPF off and Bandwidth full?

    February 18, 2014 at 6:08 am #13816
    kes11
    Member

    HPF at 45
    Bandwidth 15

    February 18, 2014 at 11:35 am #13817
    jonnyc
    Member

    Thanks

    February 18, 2014 at 11:37 am #13818
    jonnyc
    Member

    What about Rolloff?

    February 18, 2014 at 4:06 pm #13819
    kes11
    Member

    Rolloff….12, but I wouldn't go any higher than 15 and then ONLY if you hear nasties coming through. I've never went higher than 15 because it muffles the high end to much. Start at 12 and then listen. Processing is subjective.  😉

    March 21, 2014 at 1:22 am #13820
    JesseG
    Member

    Don't use the low pass filter (roll-off) because the codec already has its own filtering that's setup to work adequately for the codec.  The bandwidth can be set to 20kHz though, to avoid any potential problems (in the processing) caused by rogue super-sonic sound. 🙂 But it shouldn't effect the codec itself though, just the same.

    High pass filter should be used for the same reasons, as you can prevent sub-sonics from effecting the first band with sound that won't be reproduced by 99.5% of the systems out there.  That 20-30 Hz or below area.  Breakaway's high-pass filter is very steep.

    March 21, 2014 at 8:18 am #13821
    jonnyc
    Member

    Ok thanks I have set bandwidth 16khz thats the highest it will go anyway and hpf is on 45, slope is on 0.

    March 31, 2014 at 9:41 am #13822
    yorkie98
    Participant

    Hi,
    HPF of 45 might be rolling off some of your deep bass a bit, try 30Hz.
    If you are only able to get 16Khz then something is not set right, the latest version (unless you are not using the lastest version) allows other steps after 16Khz such as 17.5 and 20Khz.
    If you are not using BBP for the stereo encoder at this stage, then you should disable the main output and use the L/R outputs.
    Disabling the main output opens up more options (some of which only relate to AM operation) but also should give you the full range of filtering options.
    Your external stereo coder should have 10th order IIR Butterworth filters on the inputs which will have a steep rolloff at 15Khz in any case so I would try to avoid double filtering the high end as it may result in loss of high end detail.

    Yorkie.

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