[music-dsp] R: Re: The Art of VA Filter Design book revision 1.1.0

2015-07-25 Thread Marco Lo Monaco
Hello Andrew.Yes as I already said I know the Mitra paper of the 75 but it relates to linear networks. Of course I know the Italian guys (personally) and to my knowledge they were the pioneers as far as the nonlinear systems are concerned.  I thought that there were references in the 70s t

Re: [music-dsp] The Art of VA Filter Design book revision 1.1.0

2015-07-25 Thread Julius Smith
Hi Andy, Also, the purpose of a "reflection-free port" in wave digital filters (WDF) was to eliminate delay-free loops. That probably goes back earlier than 1975 since WDFs started in 1969. - Julius On Sat, Jul 25, 2015 at 12:42 PM, Andrew Leary wrote: > On Jul 25, 2015, at 12:25 AM, Marco Lo

Re: [music-dsp] The Art of VA Filter Design book revision 1.1.0

2015-07-25 Thread Andrew Leary
On Jul 25, 2015, at 12:25 AM, Marco Lo Monaco wrote: > Also you tell us that the delay free loop problem was initially faced in the > 70s, which is something I didn't know. Do you have please any citation about > it? An important early reference is: Szczupak, J. and Mitra, S.K., “Detection, Lo

[music-dsp] R: R: Re: The Art of VA Filter Design book revision 1.1.0

2015-07-25 Thread Marco Lo Monaco
Unless you consider the papers by Mitra et alias, but dealing only with linear graphs computability…which are dated effectively in the 70s. M. Da: music-dsp [mailto:music-dsp-boun...@music.columbia.edu] Per conto di Marco Lo Monaco Inviato: sabato 25 luglio 2015 01:31 A: music-dsp@music.c

Re: [music-dsp] Non-linearity or filtering

2015-07-25 Thread robert bristow-johnson
On 7/25/15 10:57 AM, Tom Duffy wrote: You didn't change the bandwidth. If the target signal is max 30Hz and you have a 192kHz sampler, you low pass at 2x your max frequency (60Hz, but lets say 100Hz for convenience) using a brick wall digital filter (processed at 192kHz). Then you do a down

Re: [music-dsp] Non-linearity or filtering

2015-07-25 Thread Tom Duffy
You didn't change the bandwidth. If the target signal is max 30Hz and you have a 192kHz sampler, you low pass at 2x your max frequency (60Hz, but lets say 100Hz for convenience) using a brick wall digital filter (processed at 192kHz). Then you do a downsampling of the signal from 192kHz to 10

Re: [music-dsp] Non-linearity or filtering

2015-07-25 Thread Peter S
On 25/07/2015, Peter S wrote: > On 23/07/2015, robert bristow-johnson wrote: > >> depends on what we have available for sample rates. essentially we are >> only limited by the laws in Information Theory. if i have a 192 kHz >> system and i only need to measure a 30 Hz waveform, there is a lot i c

Re: [music-dsp] Non-linearity or filtering

2015-07-25 Thread Peter S
Okay, a few more thoughts: On 23/07/2015, robert bristow-johnson wrote: > okay, since there is no processing, just passing the signal from A/D to > D/A converter, there is only one quantization operation, at the A/D. That's only true *if* it's a non-dithered converter (read: a converter from the