Re: [linux-audio-dev] applying RIAA curves in software

2005-10-29 Thread fons adriaensen
On Sat, Oct 29, 2005 at 03:10:50PM +0300, Jussi Laako wrote: > >From quality point of view, at least I would recommend using IIR filters > for this... Please ignore my previous post - I misread 'FIR' where you wrote 'IIR', and that explains it all... -- FA

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-29 Thread fons adriaensen
On Sat, Oct 29, 2005 at 03:10:50PM +0300, Jussi Laako wrote: > On Wed, 2005-10-26 at 02:41 +0200, fons adriaensen wrote: > > > Filter 1: F = 50 Hz, A = 9 > > Filter 2: F = 2120 Hz, A = 1 > > > > and add the two outputs. > > >From quality point of view, at least I would recommend using IIR

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-29 Thread Richard Smith
> >From quality point of view, at least I would recommend using IIR filters > for this... > > Unless digital'ish sound is preferred... ;) Fons sent me a LADSPA and native jack filter that he wrote that will do this. I haven't tested it yet. When I finally get jack up and running on my system I'l

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-29 Thread Jussi Laako
On Wed, 2005-10-26 at 02:41 +0200, fons adriaensen wrote: > On Tue, Oct 25, 2005 at 06:47:51PM -0500, Richard Smith wrote: > > > Which one is 9 the 50 or the 2120? > > Any suggestions on what program I can use to run these? Audacity will > > do LADSPA plugings but I rather something I can script

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-26 Thread Richard Smith
> > ecasound? The option format is a bit obtuse, but youve only got to figure > it out once, right :) Looks like exactly what I need. The option stuff seems fairly intuitive so far. It has the -efl option which is a low pass filter built in but there isn't a gain setting. So I'm not quite sure

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-26 Thread Steve Harris
On Tue, Oct 25, 2005 at 06:47:51PM -0500, Richard Smith wrote: > > I don't want to bring down the great work done by Jamin's authors, but > > if fidelity is among you goals then using Jamin for RIAA equalisation > > would be a bad idea. > > Fidelity is in fact the primary goal. > > > > > It's qui

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Richard Smith
> > Which one is 9 the 50 or the 2120? > > Any suggestions on what program I can use to run these? Audacity will > > do LADSPA plugings but I rather something I can script. > > Filter 1: F = 50 Hz, A = 9 > Filter 2: F = 2120 Hz, A = 1 > > and add the two outputs. In light of your last post

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread fons adriaensen
On Tue, Oct 25, 2005 at 06:47:51PM -0500, Richard Smith wrote: > Which one is 9 the 50 or the 2120? > Any suggestions on what program I can use to run these? Audacity will > do LADSPA plugings but I rather something I can script. Filter 1: F = 50 Hz, A = 9 Filter 2: F = 2120 Hz, A = 1 an

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread fons adriaensen
On Tue, Oct 25, 2005 at 06:52:05PM -0500, Richard Smith wrote: > What's your take on the pink noise calibration? I'm not sure yet if > I'm going to go to that much trouble but if I did how easy is it to > convert that to a LADSPA filter? The calibration only makes sense if you have a disc with p

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Richard Smith
> one to 50 Hz and the second to 2120 Hz. Mix the outputs in the > ratio 9 to 1, and the result will be a *perfect* RIAA filter. What's your take on the pink noise calibration? I'm not sure yet if I'm going to go to that much trouble but if I did how easy is it to convert that to a LADSPA filter?

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Richard Smith
> I don't want to bring down the great work done by Jamin's authors, but > if fidelity is among you goals then using Jamin for RIAA equalisation > would be a bad idea. Fidelity is in fact the primary goal. > > It's quite simple to make an RIAA filter with for example two > first order lowpass LAD

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread fons adriaensen
On Tue, Oct 25, 2005 at 12:24:39PM -0500, Jan Depner wrote: > > If you download JAMin you'll find that I've already put the RIAA > > curve in the sample .jam files. I've used this to record directly from > > album to 24/96 with no preamp. It works fine. > > Wait, let me rephrase that -

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Jan Depner
On Tue, 2005-10-25 at 12:06, Jan Depner wrote: > On Tue, 2005-10-25 at 08:38, Richard Smith wrote: > > I'm going to convert my fathers record collection over to CD. Doing > > some google research. > > > > According to http://www.tracertek.com/newway.htm they claim the "new" > > and best way to do

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Richard Smith
> If you download JAMin you'll find that I've already put the RIAA > curve in the sample .jam files. I've used this to record directly from > album to 24/96 with no preamp. It works fine. Sweet. What input did you use on your soundcard? Can I yak with you off list? This is getting kinda

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Jan Depner
On Tue, 2005-10-25 at 08:38, Richard Smith wrote: > I'm going to convert my fathers record collection over to CD. Doing > some google research. > > According to http://www.tracertek.com/newway.htm they claim the "new" > and best way to do LP to CD is to use a flat preamp, record at 24bit, > 96kHz

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Richard Audette
Not sure if it's scriptable, but I believe Audacity has this built in: Effects -> Equalization -> RIAA Richard At 09:38 AM 10/25/2005, you wrote: I'm going to convert my fathers record collection over to CD. Doing some google research. According to http://www.tracertek.com/newway.htm they cla

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Richard Smith
> > The corners are at 50, 500, and 2120 Hz IIRC. > Slope is -6dB / octave, so the weighted sum of two > first order lowpass filters is all you need. > Do you know if the RIAA_EQ in JAM includes this? -- Richard A. Smith

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Steve Harris
On Tue, Oct 25, 2005 at 08:38:18 -0500, Richard Smith wrote: > I'm going to convert my fathers record collection over to CD. Doing > some google research. > > According to http://www.tracertek.com/newway.htm they claim the "new" > and best way to do LP to CD is to use a flat preamp, record at 24b

Re: [linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Alfons Adriaensen
On Tue, Oct 25, 2005 at 08:38:18AM -0500, Richard Smith wrote: > I haven't found any RIAA filters yet so I guess I'm looking at > writeing one. So does anyone have any information on where to find > the official RIAA curve to make a plugin from? The curve as used in most preamps is the combinati

[linux-audio-dev] applying RIAA curves in software

2005-10-25 Thread Richard Smith
I'm going to convert my fathers record collection over to CD. Doing some google research. According to http://www.tracertek.com/newway.htm they claim the "new" and best way to do LP to CD is to use a flat preamp, record at 24bit, 96kHz and then apply the RIAA curve in software after the fact. Ei