simple question about highshelf

Nappylady · Sep 9, 2003, 04:07 PM

I want to change the EQ Highshelf so that the corner frequency can be selected at more (how to put this) useful values. 12k might be low enough for a Timbre filter, but for drastic EQ without breaking the GPR bank, it really should be startable as low as 1k.

I got into dane and looked, however, and I couldn't see the usual "controls" section. How, exactly, would I go about changing the minimum value on the highshelf filter? If I have to export, then edit, then reimport, I'm fine with that, but please... I really need a lower-reaching highshelf filter.

Thanks in advance.

Lex Nahumury · Sep 9, 2003, 08:36 PM

The reason you don't see any 'controls' is because this effect is controled by a DLL extension.
To change/set the cuttoff point, about 5 dsp parameters have to be changed 'on the fly'.
This can only be done via an dll extension, not in Dane only.

The only way to change such 'dll-ed' plugins is to re-compile them in C++ using VS6.0 and the SDK.
(See EQ_Highshelf.cpp in the SDK)

Btw; this goes for most filter based effects because of the nr. of simultanious calculated
and updated filter coeffs.

I agree that 12khz is quite high as a minimum value.

/LeMury

Soeren_B · Sep 9, 2003, 08:42 PM

To modify the ranges of Highshelf you need to go into the source code in the kX SDK and change a few lines in EQ_Highshelf.cpp

The effect was created over a year ago. I think the frequency limitation is within the filter coefficient algorithm, but I can't really remember.

The source code is nicked from www.musicdsp.org

Just search for cookbook

Isn't it possible to acheive HS filter with some of the newer filter plugins (like Max' parametric filter?)

A quick look at the code at my part: The error may be at line 59 where TMP is calculated. Looking at the original source this should only be divided by 40. For some reason this is divided by 400. I should really look into this again

Cheers
Soeren

Nappylady · Sep 9, 2003, 10:12 PM

Shucks... does that mean I'm SOL? I don't have VC++, and if I did, I'm not any good at it... is there any way one of you guys, or someone else who knows how to do this, could recompile it with a lower min value (perhaps 1k) and send the new DLL to me?

Lex Nahumury · Sep 9, 2003, 11:30 PM

Quote:

Originally posted by Nappylady
Shucks... does that mean I'm SOL? I don't have VC++, and if I did, I'm not any good at it... is there any way one of you guys, or someone else who knows how to do this, could recompile it with a lower min value (perhaps 1k) and send the new DLL to me?

Well, It is Soeren's source and he already gave you a clue were to look.
(As for VS6; ever heard of 'peer to peer'?..ahuuumm.

)

Hmmm...maybe Soeren will fix it. (as I understood from his post)

/LeMury

Nappylady · Sep 10, 2003, 01:46 AM

Hope so. I've already gone up some steep learning curves and I'd hate to have to go up another one between now and tomorrow afternoon!

As it stands, I'm using a 10-band EQ to get what I need done, except it takes 88 GPR registers, where the highshelf itself takes only 20--I could use 2 highshelves and a lowshelf to get what I need and save 28 registers. Since GPR's are at an extreme premium in my system, conserving them is a Good Thing! I *need* to simplify in order to drive my entire sound system.

Thanks for all the help guys, you've given me tons of information in a short period of time... more than I expected, actually. Well-done!

Sep 9, 2003, 04:07 PM	#1
Nappylady DriverHeaven Addict Join Date: Jun 2003 Posts: 257 Rep Power: 0	simple question about highshelf I want to change the EQ Highshelf so that the corner frequency can be selected at more (how to put this) useful values. 12k might be low enough for a Timbre filter, but for drastic EQ without breaking the GPR bank, it really should be startable as low as 1k. I got into dane and looked, however, and I couldn't see the usual "controls" section. How, exactly, would I go about changing the minimum value on the highshelf filter? If I have to export, then edit, then reimport, I'm fine with that, but please... I really need a lower-reaching highshelf filter. Thanks in advance.

Sep 9, 2003, 08:36 PM	#2
Lex Nahumury DH Senior Member Join Date: Jan 2003 Location: The Netherlands Posts: 1,932 Rep Power: 64	The reason you don't see any 'controls' is because this effect is controled by a DLL extension. To change/set the cuttoff point, about 5 dsp parameters have to be changed 'on the fly'. This can only be done via an dll extension, not in Dane only. The only way to change such 'dll-ed' plugins is to re-compile them in C++ using VS6.0 and the SDK. (See EQ_Highshelf.cpp in the SDK) Btw; this goes for most filter based effects because of the nr. of simultanious calculated and updated filter coeffs. I agree that 12khz is quite high as a minimum value. /LeMury

Sep 9, 2003, 08:42 PM	#3
Soeren_B kX Project DSP Engineer Join Date: Dec 2002 Location: Denmark Posts: 94 Rep Power: 0	To modify the ranges of Highshelf you need to go into the source code in the kX SDK and change a few lines in EQ_Highshelf.cpp The effect was created over a year ago. I think the frequency limitation is within the filter coefficient algorithm, but I can't really remember. The source code is nicked from www.musicdsp.org Just search for cookbook Isn't it possible to acheive HS filter with some of the newer filter plugins (like Max' parametric filter?) A quick look at the code at my part: The error may be at line 59 where TMP is calculated. Looking at the original source this should only be divided by 40. For some reason this is divided by 400. I should really look into this again Cheers Soeren

Sep 9, 2003, 10:12 PM	Thread Starter #4
Nappylady DriverHeaven Addict Join Date: Jun 2003 Posts: 257 Rep Power: 0	Shucks... does that mean I'm SOL? I don't have VC++, and if I did, I'm not any good at it... is there any way one of you guys, or someone else who knows how to do this, could recompile it with a lower min value (perhaps 1k) and send the new DLL to me?

Sep 10, 2003, 01:46 AM	Thread Starter #6
Nappylady DriverHeaven Addict Join Date: Jun 2003 Posts: 257 Rep Power: 0	Hope so. I've already gone up some steep learning curves and I'd hate to have to go up another one between now and tomorrow afternoon! As it stands, I'm using a 10-band EQ to get what I need done, except it takes 88 GPR registers, where the highshelf itself takes only 20--I could use 2 highshelves and a lowshelf to get what I need and save 28 registers. Since GPR's are at an extreme premium in my system, conserving them is a Good Thing! I need to simplify in order to drive my entire sound system. Thanks for all the help guys, you've given me tons of information in a short period of time... more than I expected, actually. Well-done!