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Chebyshev IIR - how to achieve band-pass tranform?

Hello newsgroup, the book "Guide to Signal Processing" shows a recursive filter, the chebyshev filter, implemented either as LowPass or as HighPass version. How can you use a Chebyshev in a singel stage as a BandPass filter? A BandPass implemented as FIR is formed by adding the Low- and H...

polynomial approximation

Hi This is regarding usage of chebyshev polynomials for function approximation. I work on this problem during my spare time. The Chebyshev polynomial coefficients are obtained from unequally spaced zeroes of the function. But, if we use the same Chebyshev polynomial to approximate a periodic ...

2nd order Chebyshev II analogue prototype

Hi all, I need the above, but I can't find it in any of the books I have handy and every google search I try turns up nothing but references to Matlab :-(. The Chebyshev I analogue prototype is: H(s) = 1 / (s^2 + s / Q + 1) and I was thinking of subtracting the above from 1 but I'm...

Re: BiQuad frequency response for visualisation

Btw. I'm pretty newbie in this, what is exactly the bilinear transform in this case? I've read about the pole-zero method, but this does not seem too close. Just please give me a hint :-). And one more not very celver question : What is exactly the difference between filters like Chebyshev, biqua...

Effect of Nonlinear Group Delay on Signals

Hello, I am trying to model the effect of group delay of an analog filter with complex transfer function H(f) on a phase modulated signal s(t), with a complex spectrum S(f). The analog filter I would like employ is a Chebyshev n=4, with 0.1dB ripple, but the exact filter is not important right now...

Re: Low Pass Reconstruction Filter

dacrow wrote: > I'm trying to build a Low Pass Reconstruction Filter for use after a DAC . > The thing is it has to be a Zi = 300 Ohm input and the fc has to be 37 MHz > and 50 dB attuenuation @ 118 Mhz and the passband ripple has to be < 1dB. > Already tried the Butterworth but the coils...

Re: fixed point exp10(x)

Hi What polynomial are you using for approximation? You are better off using the Chebyshev polynomial which has the minmax property (minimizes the maximum error). But of course the problem is that the Chebyshev polynomial is based on non-uniform sampling points and if your samples are uniforml...

IIR vs. FIR (complexity issues)

Hi, I would like to know on the implementation complexity issues beween FIR Filter vs. IIR Filter (Chebyshev). I know that IIR is more complex than FIR. But, in case of the FIR filter has higher order number than IIR, FIR can be more complex. If I have IIR Chebyshev 10th order vs. FIR with ...

Re: Hanning window roll off (Matlab)

dpenev@yahoo.com (Dimitar Penev) writes: > In Matlab there is Hanning function which implement cos^2(t) window. > It has -18 db/oct roll off. I need to estimate the signal PSD using > window with higer roll off. The sin^4(t) seems adequate for my > purpose but it seems it is not implemente...

Re: exponential algorithm

"kc6zut" writes: > I need an algorithm for computing the exponential of a real number using > only elementary operations (addition, subtraction, multiplication and/or > division). I have a PLC (Programmable Logic Controller - used in > industrial controls) as the processor. It has no ...

Anti Aliasing of Arbitrary Waveforms

What are the common method(s) for preventing aliasing of arbitrary waveforms generated within a DSP application? I understand that waveforms supplied as analog signals and presented to an ADC must first be lowpass filtered to remove harmonics above the Nyquist frequency, but what about generate...

Re: Highest possible speed algo in Vb or C or Pseudocode

On 5 Jan, 04:58, "Steven G. Johnson" wrote: > Also, it's not at all clear to me how > you think templates help you gain performance in the above code vs. a > C-style explicit implementation The rationale for the question is that templates displays all the code to the compiler at once. I...

Re: Gain in IIR Chebyshev Filter?

On Feb 5, 11:44=A0am, Rune Allnor wrote: > On 5 Feb, 17:28, "superraton" wrote: > > > I have a problem when I calculate the coeffs of my chebyshev IIR filter= s > > (via Bilineal Transformation), and I hope someone can help me! > > The thing is that when I compare my coeffs with ...

Testing a chebyshev filter

I'm not quite sure what I'm expecting as an output! I seem to be getting a square wave from a sine wave with an continually decreasing frequency! Is this right? Cheers Triff ...

paper needed

Complex Chebyshev Approximation for FIR Digital Filter Design Lina J. Karam & James H. McClellan if any bidy has this paper please email it at danishzzz@yahoo.com thank u ...

Bandpass filter techniques

Some bandpass filters I have heard of: 1. Chebyshev 2. Butterworth 3. Raised Cosine What are the attribtues of theses filters that make ones more useful than another in a given sitation? Iasac ...

Re: How to design FIR filter with matematical equation?

On May 23, 7:11 am, "c1910" wrote: > hi, > i'm very new with DSP FIR. > i need to make a Bandpass filter with FIR design. first, i use the AM > signal for the input, then i want to get the information signal by > filtering the AM signal. > The problem is to get the value of transfer f...

DCT derivative

Hi all, I am trying to calculate derivatives of chebyshev coefficients using FFTW for cosine(x). However I am not getting back the right values when I perform inverse chebyshev transform. Can anyone check the code below and tell me the possible errors. Thank you. program test im...

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

A million of times of thank you, to the guys who have helped me in this problem. Before I saw your suggestions I was trying to compensate for that poor droop by using a pre-warped 2nd order chebyshev (implemented on dsp and not on FPGA). I must say that it also gave quite some good performance ...

Re: Why minimising in the mean-error sense.

In article bw9zb.50644$jf4.2789643@news000.worldonline.dk, Jack L. at jack_nospam@nospam.dk wrote on 12/02/2003 18:47: > Quote from Simon Haykin's book "Adaptive Filter Theory", 4th edition, on the > Wiener filter (chap. 2): > > "We now summarize the essence of the filtering problem with...

Re: Thoughts on the C/Assembly Debate

On 29 Jul, 20:13, Jerry Avins wrote: > William Hughes wrote: > > ... why give up the advantages of a high level language when > > you do not have to? Yes there are times when a good assembly > > programmer can beat a good compiler in terms of speed, and situations > > where it m...

Re: Approach to demodulating AM-signals?

Hello Rick, > Engineers shouldn't have a tough time > gettings dates. I say that because: > > "Filter designers get a better response." > Interesting :-) But Chebychev wasn't exactly Casanova, although rumors have it that he had a daughter and in public he never admi...

Re: inverse filtering?

Well... I've got a program on my web page to find an inverse filter, but it will give garbage on an "impossible" problem - such as inverting an ideal highpass. Anyway, feel free to experiment. http://www.elisanet.fi/mnentwig/webroot/nonminphase_inverse/index.html Note that it makes extens...

Standard filters for interpolation/decimation?

I'd really like not to reinvent the wheel for my current hobby project, so I beg of all DSP people out there - what are the standard filters used for 16X interpolation/decimation? Are they windowed-sinc, Chebyshev, Butterworth, or something else? And what are the coefficients, can I find tables ...

Importance of phase in Audio

Hello all, i am designing a low pass filter and high pass filter to pass my audio samples. in matlab i checked out both butterworth and chebyshev(cheby2) 3rd order filter. I have observed there is a lot of differance in the phase plot of both the filters. Now my query went to what ...

Additional Real Poles?

The classic IIR filters have either one or none of the real poles. However when designing an analog part, it is often possible to stick many additional 1-st order RCs into the schematics. Those realpole RCs can improve the performance without any side effects. This seems to be a very typical s...

Re: [Question] How to get BW or Q from slope(db/oct) for HPF

Jerry mentioned the Audio EQ Cookbook at harmony-central.com but there are problems with answering your question directly. in article m5mdnTcdJ5_tMrjfRVn-jw@giganews.com, krish at career4krish@rediffmail.com wrote on 03/02/2005 07:20: > Topic : To design an IIR HPF filter using IPP(Intel In...

on decimate filters

hi, On the FPGA implementation of decimation filters, which type of decimate filters do you prefer? I am designing a IF DDC converter, and wana use FPGA to implement the decimate filter, but I found the Half-band lowpass and the euipripple fir filters can hardly stop the out-band...

Complex FIR Filter Design - Notation in Preuss' IEEE Trans. Paper

Is anyone familiar with the following paper? Preuss, K, "On the Design of FIR Filters by Complex Chebyshev Approximation," IEEE Trans. Acoust., Speach, Signal Processing, vol. 37, pp. 702-712, 1989. The author uses a notation I am not familiar with. Specifically, see equation (8): | E(Om...

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...

Re: Window functions

"Rune Allnor" wrote in message news:f56893ae.0408310548.8ba60b4@posting.google.com... > Hi all. > > I'm playing a bit with window functions in filter design etc, and > have come across a couple of gruelling expressions. More specifically, > the Chebychev window [1, eq. 5-17], the Tuk...

Re: FIR all pass and Bessel Function unit sample response

Fred Marshall wrote: > So: why should an equiripple all pass have a unit sample > response that approximates or *is* a sampled Bessel function of > some order? Not sure if it leads anywhere, but the Bessel Fourier transform is F{J_n}(w) = { 0, |w| > 1; 2*j^n*T_n(w)/sqrt(1-w^2), |w| ...

Re: How much do Windowing procedures harm the signal?

Hi I am having the problem with the amplitude correction also. I make measurements in the freq. domain ,then I am going to the time domain and cutting off the reflections. After this I am going back to freq. domain. When applying the gain coherence coefficients from Harris paper, my windowed sig...

Re: Crossover networks. Can someone recall the name?

Greg Berchin wrote: > > 1. =C2uild a biquad HPF with Fc =3D 20Hz and Fs =3D 48kHz. > > 2. Apply a small signal to the input. > > 3. Observe the amount of trash at the output. > =20 > =20 > 20Hz? I thought that we were talking about 100Hz. I suggested to try lower frequency just to m...

Source separation problem.

Hi all, I'm new in this newsgroup and I thank you in advance for your help. My problem is the following. I have a couple of signals (X, Y) and I want to separate the two sources that compose it (X1,Y1) and (X2,Y2). I know that (X1,Y1) has low frequencies from 0 to ~3500Hz and that (X2,Y...

Re: Arctan approximation example

On 30 Jul 2003 05:02:11 -0700, jomfrusti@image.dk (=?ISO-8859-1?Q?Ren=E9?=) wrote: > Is it possible to get a fast fix point Arctan routine written in C > using the principle with a lookup table or perhaps another principle? > > Regards, > René Hi, Look-up table methods are the fas...

Re: linear system

On Oct 21, 4:41 am, wabehtd...@alumni.com wrote: > On Oct 21, 5:08 am, Tim Wescott wrote: > > > > > On Sat, 20 Oct 2007 08:36:11 -0700, wabehtdieh wrote: ... > > > If you put a sine wave in > > > do you get a sine wave out?(Linear) > > > Nuh uh. There's a long thread on ...

Noise-feedback...

Hi group! I'm an engineering student and I'm trying to implement an IIR filter. It's a 6th order Chebyshev LP filter. We perform L2 norm scaling of the coefficients. To simulate the implementation environment we programmed the whole thing in Matlab, rounding the products in the appropri...

How spectral leakage changes the phase spectrum?

Hello All, I want to understand how spectral leakage changes the phase spectrum of a sine wave? Also when I apply window (blackman harris 11 Term or chebyshev window with 300db attenuation), I see a significant amount of reduction in spectral leakage in ...

Design of a Filter

Hi, I am modelling the physical layer of an 802.11 transmitter (to implement it into an FPGA). At this moment I want to design the digital filter responsible of pulse shaping (before the DAC). My doubts are: 1. FIR or IIR filter?, why?. 2. For each option (FIR or IIR) there are different ty...