If the noise includes some DC it seems that a matched filter would treat it as a zero frequency "curve" and eliminate it in the convolution along with all the higher frequency noise. Bret Cahill
Matched Filtering DC Noise Out
Started by ●September 18, 2009
Reply by ●September 18, 20092009-09-18
Bret Cahill wrote:> If the noise includes some DC it seems that a matched filter would > treat it as a zero frequency "curve" and eliminate it in the > convolution along with all the higher frequency noise.What noise? What filter? Who chose the "match"? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●September 18, 20092009-09-18
Oh look - legendary imbecile moron troll google-poster with a yahoo address Bret Cahill has something to say. Let's all stop what we're doing and savor this new gem. "Bret Cahill" <Bret_E_Cahill@yahoo.com> wrote in message news:48494609-d0f7-4074-98b8-2fa55f2860b0@x6g2000prc.googlegroups.com... If the noise includes some DC it seems that no one has any fucking idea what the fuck I'm talking about. I mean, there's no context or background, just a bunch of rambling text posting to a random newsgroup for no reason, just because I have a brain the size of a gnat's rectum (or perhaps smaller) I mean Jesus Christ what's wrong with me?
Reply by ●September 19, 20092009-09-19
> > If the noise includes some DC it seems that a matched filter would > > treat it as a zero frequency "curve" and eliminate it in the > > convolution along with all the higher frequency noise. > > What noise?The noise that got into the original signal has some AC and a DC offset. Matched filtering should eliminate the DC as well as the AC. Bret Cahill
Reply by ●September 19, 20092009-09-19
Bret Cahill wrote: ..> Matched filtering should eliminate the DC as well as the AC.How nice! Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●September 19, 20092009-09-19
Reply by ●September 20, 20092009-09-20
On 9/19/2009 12:59 PM, Bret Cahill wrote:>>> If the noise includes some DC it seems that a matched filter would >>> treat it as a zero frequency "curve" and eliminate it in the >>> convolution along with all the higher frequency noise. >> What noise? > > The noise that got into the original signal has some AC and a DC > offset. > > Matched filtering should eliminate the DC as well as the AC. > > > Bret CahillHow can a matched filter eliminate in-band noise? DC or AC? -- Eric Jacobsen Minister of Algorithms Abineau Communications http://www.abineau.com
Reply by ●September 20, 20092009-09-20
Eric Jacobsen wrote:> On 9/19/2009 12:59 PM, Bret Cahill wrote: >>>> If the noise includes some DC it seems that a matched filter would >>>> treat it as a zero frequency "curve" and eliminate it in the >>>> convolution along with all the higher frequency noise. >>> What noise? >> >> The noise that got into the original signal has some AC and a DC >> offset. >> >> Matched filtering should eliminate the DC as well as the AC. >> >> >> Bret Cahill > > How can a matched filter eliminate in-band noise? DC or AC?It depends on who determines what is a "match". Consider the nopass filter. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●September 20, 20092009-09-20
> >>> If the noise includes some DC it seems that a matched filter would > >>> treat it as a zero frequency "curve" and eliminate it in the > >>> convolution along with all the higher frequency noise. > >> What noise? > > > The noise that got into the original signal has some AC and a DC > > offset. > > > Matched filtering should eliminate the DC as well as the AC. > > > Bret Cahill > > How can a matched filter eliminate in-band noise? � DC or AC?That's someone else's issue. The immediate issue here is if can you assume DC to be a zero frequency AC as far as matched filtering is concerned. If convolution in the time domain amounts to multiplication in the frequency domain then, at first glance, DC or square wave noise should be filtered along with the AC noise.. Bret Cahill
Reply by ●September 21, 20092009-09-21
On 9/20/2009 10:37 AM, Jerry Avins wrote:> Eric Jacobsen wrote: >> On 9/19/2009 12:59 PM, Bret Cahill wrote: >>>>> If the noise includes some DC it seems that a matched filter would >>>>> treat it as a zero frequency "curve" and eliminate it in the >>>>> convolution along with all the higher frequency noise. >>>> What noise? >>> >>> The noise that got into the original signal has some AC and a DC >>> offset. >>> >>> Matched filtering should eliminate the DC as well as the AC. >>> >>> >>> Bret Cahill >> >> How can a matched filter eliminate in-band noise? DC or AC? > > It depends on who determines what is a "match". Consider the nopass filter. > > JerryGood point. ;) -- Eric Jacobsen Minister of Algorithms Abineau Communications http://www.abineau.com
