Forums

ultimo dsp super filter

Started by Mac Decman December 27, 2011
I would like to design filter which has frequency frmo 0 hz to 1mHz
with passband equal to all filters.  I have dsp which is top notch and
will do out of band processing.  I would like to make sure all pass
band is free from phase modulation so that no problems acure with my
delicate process.  Can some one help me with this problems.  I hope
every who contributes to this group has a great holiday seaosn.   Hope
you all have mary Christmasss and Happy new years,,

MaC Decman
On 12/27/2011 5:20 AM, Mac Decman wrote:
> I would like to design filter which has frequency frmo 0 hz to 1mHz > with passband equal to all filters. I have dsp which is top notch and > will do out of band processing. I would like to make sure all pass > band is free from phase modulation so that no problems acure with my > delicate process. Can some one help me with this problems. I hope > every who contributes to this group has a great holiday seaosn. Hope > you all have mary Christmasss and Happy new years,,
MaC, Language is a problem here. I assume that you want a low-pass filter with a cut-off of 1 MHz, flat response in the passband. and linear phase response. That calls for an FIR (finite impulse response) filter. In order to design the filter, you need to know how flat the response must be -- nothing is perfect -- how much attenuation you need in the stop band, how sharp the cutoff must be (the sharper it is, the more the filter will ring) and the sample rate of the signal. Can you supply the missing information? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
On Tue, 27 Dec 2011 09:15:40 -0500, Jerry Avins <jya@ieee.org> wrote:

>On 12/27/2011 5:20 AM, Mac Decman wrote: >> I would like to design filter which has frequency frmo 0 hz to 1mHz >> with passband equal to all filters. I have dsp which is top notch and >> will do out of band processing. I would like to make sure all pass >> band is free from phase modulation so that no problems acure with my >> delicate process. Can some one help me with this problems. I hope >> every who contributes to this group has a great holiday seaosn. Hope >> you all have mary Christmasss and Happy new years,, > >MaC, > >Language is a problem here. I assume that you want a low-pass filter >with a cut-off of 1 MHz, flat response in the passband. and linear phase >response. That calls for an FIR (finite impulse response) filter. > >In order to design the filter, you need to know how flat the response >must be -- nothing is perfect -- how much attenuation you need in the >stop band, how sharp the cutoff must be (the sharper it is, the more the >filter will ring) and the sample rate of the signal. Can you supply the >missing information? > >Jerry
Jerry, Sorry, after looking though old posts for hours I just couldn't help writing a joke post. I thought everyone would see right through it. Mark
On Tue, 27 Dec 2011 11:39:49 -0800, Mac Decman wrote:

> On Tue, 27 Dec 2011 09:15:40 -0500, Jerry Avins <jya@ieee.org> wrote: > >>On 12/27/2011 5:20 AM, Mac Decman wrote: >>> I would like to design filter which has frequency frmo 0 hz to 1mHz >>> with passband equal to all filters. I have dsp which is top notch and >>> will do out of band processing. I would like to make sure all pass >>> band is free from phase modulation so that no problems acure with my >>> delicate process. Can some one help me with this problems. I hope >>> every who contributes to this group has a great holiday seaosn. Hope >>> you all have mary Christmasss and Happy new years,, >> >>MaC, >> >>Language is a problem here. I assume that you want a low-pass filter >>with a cut-off of 1 MHz, flat response in the passband. and linear phase >>response. That calls for an FIR (finite impulse response) filter. >> >>In order to design the filter, you need to know how flat the response >>must be -- nothing is perfect -- how much attenuation you need in the >>stop band, how sharp the cutoff must be (the sharper it is, the more the >>filter will ring) and the sample rate of the signal. Can you supply the >>missing information? >> >>Jerry > > Jerry, > > Sorry, after looking though old posts for hours I just couldn't help > writing a joke post. I thought everyone would see right through it.
Too many folks live the joke, unfortunately. I've stopped trying to joke with strangers by pretending to be crazy or stupid -- there's too many genuine articles out there to get any of the requisite cognitive dissonance for a good laugh. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com
On 12/27/2011 2:39 PM, Mac Decman wrote:
> On Tue, 27 Dec 2011 09:15:40 -0500, Jerry Avins<jya@ieee.org> wrote: > >> On 12/27/2011 5:20 AM, Mac Decman wrote: >>> I would like to design filter which has frequency frmo 0 hz to 1mHz >>> with passband equal to all filters. I have dsp which is top notch and >>> will do out of band processing. I would like to make sure all pass >>> band is free from phase modulation so that no problems acure with my >>> delicate process. Can some one help me with this problems. I hope >>> every who contributes to this group has a great holiday seaosn. Hope >>> you all have mary Christmasss and Happy new years,, >> >> MaC, >> >> Language is a problem here. I assume that you want a low-pass filter >> with a cut-off of 1 MHz, flat response in the passband. and linear phase >> response. That calls for an FIR (finite impulse response) filter. >> >> In order to design the filter, you need to know how flat the response >> must be -- nothing is perfect -- how much attenuation you need in the >> stop band, how sharp the cutoff must be (the sharper it is, the more the >> filter will ring) and the sample rate of the signal. Can you supply the >> missing information? >> >> Jerry > > Jerry, > > Sorry, after looking though old posts for hours I just couldn't help > writing a joke post. I thought everyone would see right through it.
It's OK, Mark. The joke was on me. I try to be gentle with strangers. The trouble is, your post wasn't all that unusual. Jerry -- Engineering is the art of making what you want from things you can get. &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
On 12/27/11 8:21 PM, Jerry Avins wrote:
...
>> Jerry, >> >> Sorry, after looking though old posts for hours I just couldn't help >> writing a joke post. I thought everyone would see right through it. > > It's OK, Mark. The joke was on me. > > I try to be gentle with strangers. The trouble is, your post wasn't all > that unusual. > > Jerry
i hope you've learned your lesson, Jerry. Vlad is right, you should crush these COMEDIOTS without mercy. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
On Wed, 28 Dec 2011 00:09:50 -0500, robert bristow-johnson
<rbj@audioimagination.com> wrote:

>On 12/27/11 8:21 PM, Jerry Avins wrote: >... >>> Jerry, >>> >>> Sorry, after looking though old posts for hours I just couldn't help >>> writing a joke post. I thought everyone would see right through it. >> >> It's OK, Mark. The joke was on me. >> >> I try to be gentle with strangers. The trouble is, your post wasn't all >> that unusual. >> >> Jerry > >i hope you've learned your lesson, Jerry. Vlad is right, you should >crush these COMEDIOTS without mercy.
Well one of these days I'll have a question which I can't answer by research and I'll post it. It sure seems after reading though this group that most people don't even look in the usual sources before popping off a post. I'm sure it drives all of the regulars almost nutty. I did really enjoy the recent thread about the rotary encoders. Not the usual area I am working in although I remember having some fun in college working on projects like that. Merry Christmas and a happy New Year to all those about, Mark DeArman
On 12/28/11 5:15 AM, Mac Decman wrote:
> On Wed, 28 Dec 2011 00:09:50 -0500, robert bristow-johnson > <rbj@audioimagination.com> wrote: > >> On 12/27/11 8:21 PM, Jerry Avins wrote: >> ... >>>> Jerry, >>>> >>>> Sorry, after looking though old posts for hours I just couldn't help >>>> writing a joke post. I thought everyone would see right through it. >>> >>> It's OK, Mark. The joke was on me. >>> >>> I try to be gentle with strangers. The trouble is, your post wasn't all >>> that unusual. >>> >>> Jerry >> >> i hope you've learned your lesson, Jerry. Vlad is right, you should >> crush these COMEDIOTS without mercy. > > Well one of these days I'll have a question which I can't answer by > research and I'll post it. It sure seems after reading though this > group that most people don't even look in the usual sources before > popping off a post. I'm sure it drives all of the regulars almost > nutty. I did really enjoy the recent thread about the rotary > encoders. Not the usual area I am working in although I remember > having some fun in college working on projects like that. > > Merry Christmas and a happy New Year to all those about, > Mark DeArman > >
same to you, Mark. you'll discover (if you haven't already) that there are some weird cultural personalities here. self-disclosure: i like to fight about the DFT or the dirac delta function and dimensional analysis. Vlad likes to belittle, well, pick on students and noobs. Rune lives in the dark Runescape above the Arctic circle. Jerry's just a nice guy. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
On 12/28/2011 5:15 AM, Mac Decman wrote:
> On Wed, 28 Dec 2011 00:09:50 -0500, robert bristow-johnson > <rbj@audioimagination.com> wrote: > >> On 12/27/11 8:21 PM, Jerry Avins wrote: >> ... >>>> Jerry, >>>> >>>> Sorry, after looking though old posts for hours I just couldn't help >>>> writing a joke post. I thought everyone would see right through it. >>> >>> It's OK, Mark. The joke was on me. >>> >>> I try to be gentle with strangers. The trouble is, your post wasn't all >>> that unusual. >>> >>> Jerry >> >> i hope you've learned your lesson, Jerry. Vlad is right, you should >> crush these COMEDIOTS without mercy. > > Well one of these days I'll have a question which I can't answer by > research and I'll post it. It sure seems after reading though this > group that most people don't even look in the usual sources before > popping off a post.
Some of the questions come from people who don't know there are usual sources.
> I'm sure it drives all of the regulars almost nutty.
Yup!
> I did really enjoy the recent thread about the rotary > encoders. Not the usual area I am working in although I remember > having some fun in college working on projects like that.
Me too. I have a couple of patents on that subject.
> Merry Christmas and a happy New Year to all those about, > Mark DeArman
And to you, Mark. Jerry -- Engineering is the art of making what you want from things you can get. &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
On 12/28/2011 2:15 AM, Mac Decman wrote:
> On Wed, 28 Dec 2011 00:09:50 -0500, robert bristow-johnson > <rbj@audioimagination.com> wrote: > >> On 12/27/11 8:21 PM, Jerry Avins wrote: >> ... >>>> Jerry, >>>> >>>> Sorry, after looking though old posts for hours I just couldn't help >>>> writing a joke post. I thought everyone would see right through it. >>> >>> It's OK, Mark. The joke was on me. >>> >>> I try to be gentle with strangers. The trouble is, your post wasn't all >>> that unusual. >>> >>> Jerry >> >> i hope you've learned your lesson, Jerry. Vlad is right, you should >> crush these COMEDIOTS without mercy. > > Well one of these days I'll have a question which I can't answer by > research and I'll post it. It sure seems after reading though this > group that most people don't even look in the usual sources before > popping off a post. I'm sure it drives all of the regulars almost > nutty. I did really enjoy the recent thread about the rotary > encoders. Not the usual area I am working in although I remember > having some fun in college working on projects like that. > > Merry Christmas and a happy New Year to all those about, > Mark DeArman > >
Mark, I think that "most people" here have a pretty good idea about the "usual sources". If one had to look up everything first, then: - one might not have time to answer as often. - one might not be as qualified to answer. But, of course, looking things up is often a good idea. Now, when I do look things up then I usually provide the links or the references (arch. almost) How do you differentiate "most people" (in this group) and "the regulars" anyway? We drive ourselves crazy ... too true! :-) Fred