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Re: Audio subtract function thru programming to create multitrack from stereo sources

usenet@apple-o.com (Mad Scientist) wrote in message news: ... > I'm looking for a utility or to program one that can take a sound file > (WAV) and take a second file, and isolate what the two files have in > common, and what is different about them. > > For instance if you have two WAV f...

Re: Sliding Goertzel of Jacobsen&Lions correct?

On Mon, 04 Aug 2003 16:48:10 -0500, Dennis@NoSpam.com wrote: > ricklyon@remove.onemain.com (Rick Lyons) wrote: > > > Hi, > > agreed. Hey guys, did we all agree that the Sliding Goertzel > > (unlike the standard Goertzel algorithm) only operates at > > integer values of k? > > > > [-...

Cascaded integrator-comb (CIC) filter question

Hi Guys, I've been trying to learn about those darned cascaded integrator-comb (CIC) filters and have reviewed Hogenaurer's original paper Hogenauer, E. "An Economical Class of Digital Filters For Decimation and Interpolation," IEEE Trans. Acoust. Speech and Signal Proc., Vo...

Re: name of fft(log(fft())) algorithm?

It's 2 AM and I ought to be sleeping. I'm not. I've been thinking about cepstra for hours. And here's what came out of it, apart from the hope that I, if nothing else, can get a half nights sleep after having posted this... "Fred Marshall" wrote in message news: ... > "Rune Allnor" ...

Help. Too Many Beats in Beat Detection.

I'm trying to implement "Tempo and Beat Analysis of Acoustic Musical Signals" in C#. Currently I made LowPass, HighPass, BandPass filter, And Sound IO class. I filtered the music, and marked All Beats of Lower than 200Hz, Upper than 3200Hz. And I got the result which has a Lot of Beats. (...

Re: Can an analog filter really be linear-phase FIR-style?

Ronald wrote: (snip) > You forget that the simplest true physical component has a close > to perfect delay. It's called a wire. > Any non-zero length wire will have a delay constrained by the > speed-of-light in the medium (usually Cu or Al surrounded by a > insulating dielectric)....

Re: "Comb notch" filters missing a tooth

"Rune Allnor" wrote in message news:f56893ae.0311231001.3cc8a505@posting.google.com... > Hi all. > > I have just "made" some recordings of birds nearby (which is to say that > I ripped them off a CD released by the local ornithology society, but don't > tell anyone) and want to play...

Re: sferic detection and localisation with DSP

phunkyman wrote: > First of all, i thank you for your answer. > > > > Right now, an antenna directly to an ADC is beyond the state of the art. > > > You mean it's not good to do it? I know, i just said that to "go > fast". I've got a minimum knowledge in electronics! lol I th...

Re: Confusion with magnitude plot of a freg response of a filter, plz help

wrote in message news:1131134435.441548.34430@g14g2000cwa.googlegroups.com... > Dear members: > > Plz tell me what is the point I am wrong. It is my exam. > > I have to plot the magnitude of the freq response a Low Pass filter: > > y[n]=1/3*(x[n]+x[n-1]+x[n-2]); > > > I use...

Re: Filter with (x/sin(x))^N frequency response?

David Joseph Bonnici wrote: > Hi, I need the name of the filter that has a frequency response of the > form (x/sin(x))^N. > > See a picture of the frequency response at > http://www.geocities.com/netspiri/xonsinxtothepowerofN.jpg > N here is set to 3. I know for sure that it is an FIR...

Re: Functioning of a second order Sigma delta modulator

Hi Randy, Thanks for your input. I did find where I was going wrong all the while. It was in the interval I was considering my input for and the length of the FFT being used. That mismatch, made the integrators go unstable. Its a simple SDM, I was trying for. But presently am working to...

Re: 60 Hz Hum removal

That's the whole point - the "hum" can have any number of harmonics, and the only way to cut them all back is attention to the analog circuitry. But if it's too late for that, something like an inverse comb filter will do it. On Thu, 01 Jul 2004 22:59:17 -0400, Jerry Avins wrote: > Suoda...

Re: Lowpass and highpass parameters in reverb units

"Jesper Kristensen" wrote in message news:40ee5183$0$23874$14726298@news.sunsite.dk... > "Stephan M. Bernsee" wrote: > > If we're talking about comb/allpass filter (Schroeder/Moorer) type > > reverbs, there are typically two types of HP/LP in use in such a unit: > > one is affectin...

Re: C++ data filtering

Jerry Avins wrote: > Tim Wescott wrote: > > ... > > > > If you need to know harmonic distortion then you need a comb filter. One > > way to implement this would be as a bunch of bandpass filters in > > parallel -- one at 60Hz, one at 120, one at 180, etc. If your 35 > > samples p...

Re: Decimation vs. Collapsing and their spectral effects

On Wed, 22 Sep 2004 08:23:30 -0500, jim wrote: > > > Jerry Avins wrote: > > > > jim wrote: > > > > ... > > > > > Hi Martin > > > The frequency response of your filter [1,1] is just cos function. > > > > ... > > > > That seems very strange to me; I ...

Re: CIC filter

On 27 Sep 2004 10:32:50 -0700, egan_nc@yahoo.com (Eng Gan) wrote: > Hi, Hi Eng, > Can any of you please help me with the question below? > Some paper said that CIC filter has a high gain and needed to be > compensated? Humm, I wonder where you read that(?). > From Mattew P. Donadio...

Re: Physical significance: Replications of analog signal in digtial domain

Jerry Avins wrote: (snip) > First, I want to admit to being flattered that you use the explanation I > gave at the start of this thread, that the replications are present in > the analog signal after the (salient or implicit sample-and-hold) before > any digitizing takes place. Seco...

Re: cutoff frequency of a FIR Filter

"Rune Allnor" wrote in message news:f56893ae.0410052220.4fc1b189@posting.google.com... > "Fred Marshall" wrote in message ............................... > > > I would have said that a FIR filter needs to have enough frequency > > samples > > (when you FFT the coefficients ...

Re: Practical limits of extracting a known signal level from noise

Charles Oram wrote: > > I forgot to mention an important detail - the instrumentation amplifier has > a gain of 8 and the ADC has an adjustable gain that is set to 4, so after > those gains we have a 1.44V signal with 128mV superimposed on it. > The ADC has a Vref of 2.4V, so 1% of 1...

Re: am radio buzz filter?

BobG wrote: > I listen to the am talk radio during my commute. There are a couple > places where the 60 and 120 hz hum from power lines drowns out the > talk. Would a box with a 8.3ms delay filter this out some? (never mind > the logistics of how to hook it into the darn radio...) Repor...

Re: Overharmonics and comb filters

in article f56893ae.0412010412.f910ba5@posting.google.com, Rune Allnor at allnor@tele.ntnu.no wrote on 12/01/2004 07:12: > Hi all. > > I have got involved with this signal detection and characterization > problem where we have reason to expect that the useful signal is > hidden in...

Re: CIC filter question

Mark Borgerding wrote: > Jerry Avins wrote: > > > Mark Borgerding wrote: > > > > > > > Jerry Avins wrote: > > > > > > > > > > Mark Borgerding wrote: > > > > > > > > ... > > > > > > > > > > > > > > > > > I don't think a Hogenaur(sp?) representation of a CIC filter is > > >...

Re: A little FIR/IIR puzzler

On Fri, 07 Jan 2005 19:57:32 -0500, robert bristow-johnson wrote: > in article 348maaF464m2bU1@individual.net, Jon Harris at > goldentully@hotmail.com wrote on 01/07/2005 19:03: > > > "glen herrmannsfeldt" wrote in message > > news:crn4gd$kdm$1@gnus01.u.washington.edu... > ... > >...

Re: Establishing noise content of a received signal

Cathal Campbell-Shaw wrote: > Hi, > > I'm a student and I'm working on a project where I convert a voltage > signal to light and then receive this light signal and convert it to > voltage once again. I use a DAC to create the initial voltage signal > and a ADC to convert the received s...

Re: Digital equivelant of passive LC filters

robert.w.adams@verizon.net wrote: .=2E. > Is there some set of coefficients or > particular structure that will gaurantee that all poles and zeros lie > on the unit circle, in a way that is similar to the LC filter mentioned > above? You can have N evenly distributed poles on the unit ci...

Tunable FIR filter spectral nulls?

All, Looking for any help here from my DSP cronies. I am analyzing a method of filtering a periodic pulsed sinusoid signal with a bandpass FIR filter and have hit a stumbling block! As you know, the spectrum of the pulsed periodic sinusoid results in line spectra based on the pulse length (...

Re: downsampling -> FFT -> upsampling

> > Exactly what do you do? I believe there is a post filter involved after the > upsample stage. If you leave that out, you'd get all sorts of artifacts > in the data. > > Rune > Hi Rune, I take a buffer of size bufsize and: 1. Throw away every second sample to obtain a buffer...

Re: Pitch detection

in article 070420051129510384%x@x.x, ben at x@x.x wrote on 04/07/2005 06:30: > In article , robert > bristow-johnson wrote: > > > i wouldn't do that. you still need to deal with the possibility of missing > > or weak harmonics (inc. fundamental). i agree with Dmitry Terez about n...

Re: Synchronous AM demodulator

Hi Jerry, I am working on NTSC decoding in software using quadrature sampled NTSC signals (8 Mhz complex samples with audio at 2.75 Mhz and video at -1.75 Mhz). I have implemented a comb filter, but it is not working perfectly because of the drift in video carrier frequency. Can someone te...

Re: how, if at all, do AMDF & ASDF relate to fourier transforms?

in article 180420052120194542%x@x.x, ben at x@x.x wrote on 04/18/2005 16:22: > can anyone tell me how or if AMDF & ASDF relates to fourier transforms > please? -- do AMDF & ASDF make use of fourier transforms? or are part > of their logic based on fourier transforms in some way? or are AMDF ...

Rick Lyons in EETimes!

I finally got around to picking up the April 4th EET while eating supper tonight and who do I see on the inside of the front page? Rick's got an article on embedded.com on CIC filters. Cool stuff, man. The competition is tough around here! There is at least one thing in this article I don't ge...

Re: comb filters and fourier transforms for splitting sound into frequencies

Ben, I hate to sound repetative, but a Fourier transform will give you exactly what you want. It will seperate the spectum into "bins", but it will be a continuous bin system, because it's no longer in the time domain. A comb filter is good, if you know what frequencies you're looking for,...

Re: filtering question

> Just another remark: > > Isn't your hum rather am approximatly squarewave kind off thing? > So maybe you want to use a comb filter for the hum. > So I would first try to get rid of the hum and dc offset before > you split into frames (with a comb for the hum and a dc blocker for the dc). > ...

Re: How do digital filters know the frequency ?

Fred Marshall wrote: ... > Jerry, ... > The convolution is maximum when the input frequency is the same as the > frequency used to define the filter. Except for input pulse length being > arbitrary in our case here, it's a matched filter to sinusoids at that > frequency...

Re: Realtime pitch detection - How does the different algorithms compare

in article 6N-dnXYkfZuwpQvfRVn-qg@giganews.com, PaulWiik at paul@wiik.net wrote on 05/26/2005 16:57: > I feel I have made som major progress now. I had a lot of errors in my > code prior to the last post. I believe I've been able to correct most of > thit now (some of them actually have qui...

Re: dynamic range per bit

robert bristow-johnson wrote: (snip) > it wasn't so much the delta's dimensions where i was disagreeing with the > books. (i really couldn't find any that explicitly addressed that > particular issue.) it was with the books using the "dirac comb" function > for ideal sampling, without...

Re: specifications of broadcast quality video standard

Jerry Avins wrote: > glen herrmannsfeldt wrote: > > jagadeeshbp@gmail.com wrote: > > > I have seen references saying about broadcast quality videos. (snip) > > It is about 3.5MHz video bandwidth at 30Hz or 25Hz frame rate. > > Note that this is considerably better than standar...

Re: Inverse windowing

"Duane" wrote in message news:1127408858.623711.316030@f14g2000cwb.googlegroups.com... > You generally don't do that.. Windowing allows you to better resolve > some components when you're doing a block based transform. For windows > that taper to zero near the ends, you really can't go...

Re: CIC Group Delay

On 11 Oct 2005 21:52:41 -0700, jim_nospam_beasley@yahoo.com wrote: > I would like to know if I can predict what the group delay of a CIC > filter is. > > I have an agressive FIR BPF where the sample rate is 2000 x the filter > bandwidth. The group delay is longer than I would like it to be. ...

Re: Chroma Decimation in Digital Video Signals

Randy Yates wrote: ... > Chris (et al.), is this chroma filtering problem what causes the > moire pattern you see on certain image inputs (vertical lines?). What image source? With NTSC, it's the beat between luminance and the 3.58 MHz color subcarrier. A comb filter can greatly red...