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[frozzie]

I'm using BASS_BFX_LPF to filter out everything above 15 KHz.
But how do i filter out everything below 30 Hz with let's say -32 db?
A BASS_BFX_HPF would be great ;-)

[ken]

I'm using BASS_BFX_LPF to filter out everything above 15 KHz.
But how do i filter out everything below 30 Hz with let's say -32 db?
A BASS_BFX_HPF would be great ;-)

I asked for that a while ago, and I still need it 

[(: JOBnik! :)]

Hi

On this weekend I wanted to include all BiQuad filters in BASS_FX, but unfortunately my motherboard has died yesterday and will get replacement only in about 2 weeks from now... after my system will work again, I'll add the filters

[frozzie]

Sounds freaking great!

[(: JOBnik! :)]

Hi

Did you test the latest biquad filters already?
Please post your feedbacks, so I can make it final release

[frozzie]

Since the functions "isn't supported" in Bass.Net i'm on the wrong side of the glass so to speak, i see all the goodies but can't taste them :-(
Unfortunately i don't have the right knowledge to use them.

[radio42]

I have added the new FX stuff to a pre-version off BASS.NET, which can be downloaded here:
www.un4seen.com/filez/4/Bass24.Net_pre.zip

Pls let us know, if you find anything...

[frozzie]

Thanks guys (JOBnik & radio42)
I'll test the filters and leave a report in this thread later.
For now atleast the HPF is working nicely!

[frozzie]

What am i missing?
The code below do filter out the frequencies above 250 Hz, but also lowers the volume by -40 db or more.

If i raise the fCutoffFreq to let's say 4000 Hz the i volume starts to come back.

The BASS_FX_BQF_HIGHPASS works as i expected.

private BASS_BFX_BQF _bqf1 = new BASS_BFX_BQF();
private int _bqfFX1;
...
stream = Bass.BASS_RecordStart(44100, 2, 0, null, IntPtr.Zero);

int _bqfFX1 = Bass.BASS_ChannelSetFX(stream, BASSFXType.BASS_FX_BFX_BQF, 0);
_bqf1.fCutoffFreq = 250f;
_bqf1.lFilter = BASSFXBQF.BASS_FX_BQF_LOWPASS;
Bass.BASS_FXSetParameters(_bqfFX1, _bqf1);

[radio42]

But that is pretty normal ;-)
All the 'energy' contained in the frequencies you are cutting/removing will lower the preceived listening volume.

The same actually happens with an EQ:
If you increase or lower a certain frequency band - the overall volume will be increased or lowerd as well.

[frozzie]

So after applying the filter i have to gain the signal ~40 db?
The BASS_FX_LPF doesn't behave like that.

And of course, i know that it's normal that the overall volume is getting
lower when filter out frequencies. ;-)

[(: JOBnik! :)]

Hi

I didn't set any default values for BASS_BFX_BQF parameters
so, using HPF, you have to set fBandwidth/fQ as well

but I did set the lChannel param with BASS_BFX_CHANNONE

[radio42]

So after applying the filter i have to gain the signal ~40 db?
The BASS_FX_LPF doesn't behave like that.

I don't know the details about how Jobby implemented things, but I guess...
That in your example you are just cutting more frequencies with the one filter than with the other one.
And that's simply why it might be more noticeable.

I guess it will also be very hard to measure, predict or even calculate the gain you need to apply in order to get the same loudness as before.
And in addition any gain might also lead to a distortion of the left-over frequencies.

[(: JOBnik! :)]

Hi

Here's an update to try with some changes:
http://www.jobnik.org/files/bass_fx.zip

[radio42]

The link doesn't seem to work?

[(: JOBnik! :)]

Hi

The link is updated with .zip archive

[frozzie]

Still no go :-(

            _bqf1.fCutoffFreq = 250.0f;
            _bqf1.lChannel = BASSFXChan.BASS_BFX_CHANALL;
            _bqf1.lFilter = BASSFXBQF.BASS_FX_BQF_LOWPASS;
            Bass.BASS_FXSetParameters(_bqfFX1, _bqf1);

[(: JOBnik! :)]

Hi

Please redownload the archive, it should be fine now

[frozzie]

Weeeeee... now it works!

Thanks for the tremendous (yep i Googled that word) support!

[(: JOBnik! :)]

Hi

You're welcome