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FIR notch filters using the Windowing method

Hi, I am trying to obtain a FIR notch filter which is very narrow. For example, a 50 Hz notch filter to remove mains noise from a 1250Hz signal say. Doing this with an IIR filter was easy, I could specify my "notch region" as small as [49 51]Hz. I am now trying to do the same with a FIR fi...

Notch filter

Hi, I am searching a mathematical solution for a notch filter. I measured a signal with a ADC and I want to kill one frequency (50Hz) out of the measurement data. Does anyone of you know a mathematical function for a notch filter ? best regards Oliver ...

Re: notch filter to remove 20Hz noise of ECG signal

ashcroft2006 wrote: > Hey > Im a student and need help using matlab. im extremeley new to signal > processing so this is a pretty basic question, im hoping someone can help > me. > > im removing noise from an ecg signal and i need to remove this noise at > 20hz using a notch filter, ...

IIR notch filter

I am trying to design a second order digital IIR band stop (notch) filter with the following specs: 3dB cut off frequencies: 55Hz and 65Hz I want the notch at 60Hz with atleast 90dB attenuation at the 60Hz. Sampling frequency: 200hz I tried various filter configurations like a Butterworth or...

Increasing Notch depth using windowing

Hello everyone, Hope no introduction for why I am here (I have a problem.....) Presently i am working on a ofdm simulink implementation where I need to increase the single carrier notch depth (notch is created by putting some carriers to zero)which at present is 13dB(because of 'no window' or ...

IIR Notch Filter Implementation

Hi, I want to implement a digital IIR notch filter on FPGA. I used FDA tool HDL coder, but it seems not to work properly. However, can you give me a vhdl code or example of it? Thanks... ...

Frequency domain notch filter

Hello everybody. A question from not an expert of notch filters. Suppose I have to filter out a specific frequency noise (e.g. a 50 Hz noise) from an acquired signal. Suppose my filter has not to work online, i.e. I can collect signal samples (its a digitalized signal) and then filter noise o...

Re: Demodulating AM pulse width coding (long post)

rickman wrote: > Thanks for your comments. I appreciate it. > I was involved in an IRIG-B demod about 20 years ago. As I recall, the first thing we did was to remove DC, then square the signal, and run that through a 2KHz notch filter. Since IRIG-B is primarily a 1KHz signal, squari...

Notch filter

Hi, I need to implememt a notch filter to filter 2175 Hz tone on TI C54x DSP. Does anyone know if there is source code in TI's application report? or can you point me to any source code as example? Thanks in advance! Ron ...

Notch filter design using poles and zeroes(2nd order) Newbie question

Hi all, I was given a matlab project to use a unit circle with 2poles and 2zeroes to create a notch filter. The component to be removed is 50 Hz, sampling frequency is 200 Hz. I tried putting 2 zeroes at z=1, angle= pie/2; and 2 poles at z=0.9, angle = pie/2. However, when i look at the s...

filter notch

Could you tell me how filter notch work's? ...

Re: DSP Riddle: Infinitely Narrow Notch Filter

Jerry Avins wrote in news:-bmdnb3C7cUcofPZRVn-uQ@rcn.net: > Al Clark wrote: > > > Tim Wescott wrote in > > news:8KSdnUsGjuGof_DZnZ2dnUVZ_t6dnZ2d@web-ster.com: > > > > > > > Andor wrote: > > > > > > > > > > Folks, > > > > > > > > is it possible to construct a causal a...

how to get rid of ringing with IIR notch filters?

Hello, I have an IIR notch filter ( i.e. bandstop ), that rings like crazy whenever a transient signal comes through ... which is very unwanted for my application. Anybody have any ideas how to get around this? I have to stick with IIR form filters. I've tried all the various standard desi...

books on adaptive filtering

hi everybody. I'm looking for one (or more) textbook on adaptive filter theory. I'm not interesting in advanced topics, I'm interesting in a well explained book able to drive the beginner inside the matter. a book with some examples or solved exercises would be appreciated. does anyone st...

IIR phase compensator

I want to design an IIR notch filter with linear phase. It is pretty straight forward to design the IIR notch filter but I am not sure how to design the phase compensator(all pass IIR filter) that makes the overall phase of the system linear phase. Can someone throw a few pointers on this design? Ma...

Adaptive Notch Filter - LMS Algorithm

Hi everyone, I am working on a simple adaptive notch filter that will be used to cancel one sinusoid. Additionally, the filter coefficient is complex (I am looking after the error envelope). So what I have is one zero and one pole. The zero is fixed to the unit circle and the pole is very clos...

Re: laplace tranform convert to code

> tim w wrote: > > Hello all, > > > > I need some guidance in programming a laplace transfer function into > > computer language -- pseudocode for now. > > > > The transfer function is a second order function: > > > > To^2*s^2 + zeta1*To*s + 1 > > ----------------------...

Re: Minimum number of partials to fit a set of points

On 15 Apr 2005 03:46:05 -0700, clemenr@wmin.ac.uk wrote: > > However, is there a simple method of finding the fewest number of > > partials required to create a waveform that passes through each of the > > points? > > > > I could "solve" this using search-based techniques such as genetic > ...

Re: Help with THD+N calculations

Andreas Huennebeck wrote: > Fred Marshall wrote: > > > One method might be to use the sample at 1002Hz for the reference and > > forget about a notch filter, just don't include that one sample or the rms > > value of that one sample and the two adjacent ones in the sum across > > fre...

"Comb notch" filters missing a tooth

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 with these sounds to make an audio DSP demo. Among the birds are the "Eagle Owl" (Bubo Bubo) and a woo...

Re: Amplitude response of a Biquad Filter

So now my excel spreadsheet implementing R B-J's equations work fine. R B-J assisted me to build a "Master Volume Control" for the 5 band equaliser. It adds/subtracts some dB from the reponse of each filter based on the setting of the Master Volume control, by changing the coefficients ( multiply...

Re: Elliptic filters

In article , "Rune Allnor" wrote: > > Praveen wrote: > > Hi, > > > > I have a speech signal that has noise introduced at various > > frequencies. The FFt magnitude of the speech signal is of the order of > > 10 power 6 at these frequencies. The whole point is I have to remove > ...

Re: Dynamic Range

Hello Tim, > > The difference is that the first radio can handle one and only one > signal over an astounding span, but it may not be able to handle two > signals at all. The second radio can be plunked down in a busy spectral > environment and do OK -- 90dB of dynamic range is a bi...

Re: Undersampling

> My understanding is that if sampled at 2GHz a 1.1GHz signal would > appear to be a frequency of 900MHz after sampled and an FFT was > taken. A 1.9GHz signal would appear as a 100MHz signal if you took an > FFT. If you sampled a signal with two tones wouldn't you have to flip > the FFT f...

Re: Fourier Transforms compared to FFT's [ caution -- newbie at large ;]

glen herrmannsfeldt wrote: > > > Jerry Avins wrote: > > (snip) > > > You can have a continuous function, but on a CRT, plasma display, or > > stepping-motor plotter, you can't have a continuous plot. The moiré that > > troubles you is between the actual points calculated alon...

Re: where to go? is there some body can give me advice?.

hi simon based on your experience you can fit in any industry.try out for NI.i hope you should get easily into top notch postition any without trouble regards particle ...

Re: am radio buzz filter?

An analogue notch filter will suffice. Tam ...

narrow band (notch?) filters at a range of frequencies

hi, i have two very noisy signals, and i am hoping to generate some sort of "diff" of the two signals in frequency space. so far, i have computed a power spectral density estimate of each of the two signals. then i subtracted the PSD of one from the other (the idea being that frequencies wh...

Re: CE-OFDM

Nice Work Steve, I have a couple of questions if you don't mind. One of the advantages of multicarrier (at least for wireline channels) is the ability to notch out tones which have high interference, or which are forbidden for use (not so common in wireless because the channel changes so fa...

notch iir implementation

I have a similar problem described by Par in 2005. (Only different frequencies and sample size). I have signal of 10000 length that has undesired frequencies: f=0.0003, 0.0006 (f \in [0 1]) I want to get rid off. I build notch IIR and apply it. To test that it works I first created a syn...

Re: SNR calculation of the sample rate converter

On Feb 5, 12:33 am, "srikk" wrote: > > On Feb 2, 5:46 am, "srikk" wrote: > > > > i have a basic question. How to calculate the SNR of the output > signal > > > from the interpolator/decimator. > > > i can't tell, from your language, whether you want to calculate (from > > k...

About Notch Filtering in the Frequency Domain (2D images)

Dear all: I was studying the notch filter. As far as I understood, there are 2 possible ways to accomplish this task: 1) Set the DC component of the spectrum to be equal to zero, i.e: F(0,0) =0. To obtain the filtered image, apply the IDFT. 2) Create a kernel (k) having the same size as the f...

Re: removing Background Noise

> Hi Everybody, > I am working on removing Background Noise from speech Since I don't > have access to the reference noise and the only thing at hand is > speech+noise record, that's why it is a bit tricky. Can anyone help me > in this regard. > Many Thanks > > Hi, a short audio samp...

PR filterbank product filter

Hello all I give up! dementia is about to set in, time to seek professional help! Homework again... I'm playing with linear phase FIR's, the goal is to make a half-band filter. (I have made a working filterbank, but I don't fully understand the last step in the method I use.) I have a even ...

Delta-sigma ADC digital filtering

Hi all I'm working on a university project, building a delta-sigma ADC converter from discrete components and implementing a digital filter in an AVR microcontroller. The target of the project is to measure the amplitude (actually calculate RMS value) of a 50 Hz sinewave with 8 bits accuracy (7 i...

Acoustic feedback cancellation

Hello friends, We are working on an Acoustic Feedback Cancellation system. The system must cancel the feedback tone before this (usually pure tone) becomes dominant or even audible. FFT methods (for the howling frequency detection and notch adaptation) developed by my friend seems to be to...

60 Hz Hum removal

What is the preferred method for removing 60 hz hum from a signal without wiping out signal info around 60 hz? A 60 hz notch filter would not be useful because it would attenuate the signal as well. I'm interested in doing this for sampled data, so all filtering would be done in the digital do...

Re: FFT of non-integer waveform

Fred Marshall wrote: ... > One method for measuring distortion is to remove the > fundamental component and see what's left - how much energy is left. Maybe > that's what you want? I don't even remember how it was done. Jerry > probably does though. Usually, a ...

Re: Filters SOS!!

that's the problem, I don;t have any idea about filters (DSP) I'm totally new to it. I only have details to implement a 50Hz notch filter, Lowpass filter of 7.5, 15 and 30 Hz and a HPF of 1,2,4 and DC. So please guide me how to go forward for it. I searched for VB/C codes on internet but ...

Re: DC offset removal through FPGA

"robert bristow-johnson" wrote in message news:BEE0C183.8824%rbj@audioimagination.com... > so now i beg the question: so what? what's the difference? It's the difference between a stop-band and a notch. -- Matt ...