hello i was given a project that uses three DC centered FIR filters. the ouput power of three FIR filter is used to compute the fine filter split on [-1/2,1/2]. I wanted to know what this fine filter split means. and how to calculate the interepolation coefficients. -rahman This message was sent using the Comp.DSP web interface on www.DSPRelated.com
3 FIR filters
Started by ●July 5, 2005
Reply by ●July 5, 20052005-07-05
"athiq006" <arahman@drikxl.com> wrote in message news:mq6dncIYROdQDlffRVn-3w@giganews.com...> hello > > i was given a project that uses three DC centered FIR filters. > the ouput power of three FIR filter is used to compute the fine > filter split on [-1/2,1/2]. > > I wanted to know what this fine filter split means. and how to calculate > the interepolation coefficients.There's really not enough to go on. How long are the filters? What are their coefficients? What "interpolation coefficients" are you referring to? I've never heard of "fine filter split" but knowing more might help. The only Google results I found regarded photographic exposure techniques. Fred
Reply by ●July 5, 20052005-07-05
athiq006 wrote:> hello > > i was given a project that uses three DC centered FIR filters. > the ouput power of three FIR filter is used to compute the fine > filter split on [-1/2,1/2]. > > I wanted to know what this fine filter split means. and how to calculate > the interepolation coefficients. > > -rahmanIn order to center DC, you need to have negative frequencies. My ignorance is profound; I don't even know what a DC centered filter is. My guess is that "DC centered filter" is just an egghead way of saying "lowpass filter", but without any context, I don't even know where to look it up. Is this homework? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●July 6, 20052005-07-06
"Jerry Avins" <jya@ieee.org> wrote in message news:xcSdncs2ksuvX1ffRVn-uQ@rcn.net...> athiq006 wrote: >> hello i was given a project that uses three DC centered FIR filters. >> the ouput power of three FIR filter is used to compute the fine filter split >> on [-1/2,1/2]. >> >> I wanted to know what this fine filter split means. and how to calculate >> the interepolation coefficients. >> >> -rahman > > In order to center DC, you need to have negative frequencies. My ignorance is > profound; I don't even know what a DC centered filter is. My guess is that "DC > centered filter" is just an egghead way of saying "lowpass filter", but > without any context, I don't even know where to look it up. Is this homework?It must not be too common of a term because a Google search for "DC centered Filter" returned zero hits! A Google Groups search for same returned only this thread. To athiq006, please explain what a "DC centered Filter" is.
Reply by ●July 6, 20052005-07-06
Jon Harris wrote:> "Jerry Avins" <jya@ieee.org> wrote in message > news:xcSdncs2ksuvX1ffRVn-uQ@rcn.net... > >>athiq006 wrote: >> >>>hello i was given a project that uses three DC centered FIR filters. >>>the ouput power of three FIR filter is used to compute the fine filter split >>>on [-1/2,1/2]. >>> >>>I wanted to know what this fine filter split means. and how to calculate >>>the interepolation coefficients. >>> >>>-rahman >> >>In order to center DC, you need to have negative frequencies. My ignorance is >>profound; I don't even know what a DC centered filter is. My guess is that "DC >>centered filter" is just an egghead way of saying "lowpass filter", but >>without any context, I don't even know where to look it up. Is this homework? > > > It must not be too common of a term because a Google search for "DC centered > Filter" returned zero hits! A Google Groups search for same returned only this > thread. To athiq006, please explain what a "DC centered Filter" is. >Maybe just a AC coupled one? -- Please change no_spam to a.lodwig when replying via email!
Reply by ●July 6, 20052005-07-06
On Tue, 05 Jul 2005 13:24:00 -0400, Jerry Avins <jya@ieee.org> wrote:>athiq006 wrote: >> hello >> >> i was given a project that uses three DC centered FIR filters. >> the ouput power of three FIR filter is used to compute the fine >> filter split on [-1/2,1/2]. >> >> I wanted to know what this fine filter split means. and how to calculate >> the interepolation coefficients. >> >> -rahman > >In order to center DC, you need to have negative frequencies. My >ignorance is profound; I don't even know what a DC centered filter is. >My guess is that "DC centered filter" is just an egghead way of saying >"lowpass filter", but without any context, I don't even know where to >look it up. Is this homework? > >JerryHi Jer, rahman's original post certainly does fall into the category of "brain teasers". rahman should review your webpage on how to post questions on comp.dsp. See Ya', [-Rick-]
Reply by ●July 6, 20052005-07-06
Rick Lyons wrote:> On Tue, 05 Jul 2005 13:24:00 -0400, Jerry Avins <jya@ieee.org> wrote: > > >>athiq006 wrote: >> >>>hello >>> >>> i was given a project that uses three DC centered FIR filters. >>>the ouput power of three FIR filter is used to compute the fine >>>filter split on [-1/2,1/2]. >>> >>>I wanted to know what this fine filter split means. and how to calculate >>>the interepolation coefficients. >>> >>>-rahman >> >>In order to center DC, you need to have negative frequencies. My >>ignorance is profound; I don't even know what a DC centered filter is. >>My guess is that "DC centered filter" is just an egghead way of saying >>"lowpass filter", but without any context, I don't even know where to >>look it up. Is this homework? >> >>Jerry > > > Hi Jer, > > rahman's original post certainly does fall into the > category of "brain teasers". rahman should > review your webpage on how to post questions > on comp.dsp. > > See Ya', > [-Rick-]Good idea, Rick. Here's the URL: http://users.erols.com/jyavins/procfaq.htm Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●July 6, 20052005-07-06
>Rick Lyons wrote: >> On Tue, 05 Jul 2005 13:24:00 -0400, Jerry Avins <jya@ieee.org> wrote: >> >> >>>athiq006 wrote: >>> >>>>hello >>>> >>>> i was given a project that uses three DC centered FIR filters. >>>>the ouput power of three FIR filter is used to compute the fine >>>>filter split on [-1/2,1/2]. >>>> >>>>I wanted to know what this fine filter split means. and how tocalculate>>>>the interepolation coefficients. >>>> >>>>-rahman >>> >>>In order to center DC, you need to have negative frequencies. My >>>ignorance is profound; I don't even know what a DC centered filter is.>>>My guess is that "DC centered filter" is just an egghead way of saying>>>"lowpass filter", but without any context, I don't even know where to >>>look it up. Is this homework? >>> >>>Jerry >> >> >> Hi Jer, >> >> rahman's original post certainly does fall into the >> category of "brain teasers". rahman should >> review your webpage on how to post questions >> on comp.dsp. >> >> See Ya', >> [-Rick-] > >Good idea, Rick. Here's the URL:http://users.erols.com/jyavins/procfaq.htm> >Jerry >-- >Engineering is the art of making what you want from things you can get. >����������������������������������������������������������������������� >hai,Iam doing a project on Coriolis based mass flow meter, we are getting 16 bit samples(signal) from stereo ADC. Based on these samples I need to compute phase diffrence and frequency. Currently iam trying to understand the previous code that had implemented on ADSP2115BP, their they have used 3DC centered FIR filters. -rahman This message was sent using the Comp.DSP web interface on www.DSPRelated.com
Reply by ●July 6, 20052005-07-06
athiq006 wrote:>>Rick Lyons wrote: >> >>>On Tue, 05 Jul 2005 13:24:00 -0400, Jerry Avins <jya@ieee.org> wrote: >>> >>> >>> >>>>athiq006 wrote: >>>> >>>> >>>>>hello >>>>> >>>>> i was given a project that uses three DC centered FIR filters. >>>>>the ouput power of three FIR filter is used to compute the fine >>>>>filter split on [-1/2,1/2]. >>>>> >>>>>I wanted to know what this fine filter split means. and how to > > calculate > >>>>>the interepolation coefficients. >>>>> >>>>>-rahman >>>> >>>>In order to center DC, you need to have negative frequencies. My >>>>ignorance is profound; I don't even know what a DC centered filter is. > > >>>>My guess is that "DC centered filter" is just an egghead way of saying > > >>>>"lowpass filter", but without any context, I don't even know where to >>>>look it up. Is this homework? >>>> >>>>Jerry >>> >>> >>>Hi Jer, >>> >>> rahman's original post certainly does fall into the >>>category of "brain teasers". rahman should >>>review your webpage on how to post questions >>>on comp.dsp. >>> >>>See Ya', >>>[-Rick-] >> >>Good idea, Rick. Here's the URL: > > http://users.erols.com/jyavins/procfaq.htm > >>Jerry >>-- >>Engineering is the art of making what you want from things you can get. >>����������������������������������������������������������������������� >>hai, > > Iam doing a project on Coriolis based mass flow meter, > we are getting 16 bit samples(signal) from stereo ADC. > Based on these samples I need to compute phase diffrence and > frequency. > > Currently iam trying to understand the previous code > that had implemented on ADSP2115BP, their they have used > 3DC centered FIR filters. > > -rahmanI don't know much about that, but I can say that most stereo ADCs are sigma-delta converters, and as such have enough delay to make control systems that use the, very difficult to stabilize. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
