Adaptive Filter | ADPCM | ADSP | ADSP-2181 | Aliasing | AMR | Anti-Aliasing | ARMA | Autocorrelation | AutoCovariance | Beamforming | Bessel | Blackfin | Butterworth | C6713 | CCS | Chebyshev | CIC Filter | Circular Convolution | Code Composer Studio | Comb Filter | Compression | Convolution | Cross Correlation | DCT | Decimation | Deconvolution | Demodulation | DM642 | DSP Boards | DSP/BIOS | DTMF | Echo Cancellation | Equalization | Equalizer | ETSI | EZLITE (Ez-kit Lite) | FFT | FFTW | FIR Filter | Fixed Point | FSK | G.711 | G.723 | G.729 | Gaussian Noise | Goertzel | GPIO | Hilbert Transform | IFFT | IIR Filter | Interpolation | Invariance | JTAG | Kalman | Laplace Transform | Levinson | LPC | McBSP | MIPS | Modulation | MPEG | Multirate | Notch Filter | Nyquist | OFDM | Oversampling | Pink Noise | Pitch | PLL | Polyphase | QAM | QDMA | Quantization | Quantizer | Radar | Random Noise | Reed Solomon | Remez | Resampling | RTDX | Sampling | Sharc | TI C6711 | Undersampling | Viterbi | Wavelets | White Noise | Wiener Filter | Windowing | XDS510PP | Z Transform

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: 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: 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...

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...

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...

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: 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...

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 fast...

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...

Among all the windows which one is the best with narrower main lobe and lower side lobes?

Hi, I'm looking for a good window which has narrower main lobe and lower side lobes. I try to use matlab to compare Blackman-Harris, Kaiser, and Chebyshev windows. And I found the Blackman-Harris has the best main lobe width and lower side lobes. Does any one has any comments on this? Is there ...

Clarification of Rivlin-Shapiro theorem for FIR filters

Hi, I have problems applying Rivlin Shapiro's theorem for design of FIR filters. It says in [1] that : H(z) is best Chebyshev approximation to D(z) if and only if there are r points z1,z2,....zr and r positive numbers lambda1, lambda2, ... lambdas sum to 1 ... for which : sum(k=1 to r)...

Re: Crossover networks. Can someone recall the name?

On 14 Dec 2005 20:44:03 -0800, "robert bristow-johnson" wrote: > but it's not so much the ripples ramping up to the main lobe of the > impulse response, Al. it's a consequence of using the Parks-McClellan > algorithm to design an "equi-ripple" filter. those ripples in the > pass-band are...

longer FFT v. shorter FFT with interpolation

I need to analyze the magnitude spectra of some data sets. Every data vector will have 128 or fewer complex samples. I window all the data using a Chebyshev window with a certain level of relative sidelobe attenuation. Normally, I zero pad the windowed data and take a 128-pt FFT. Now I'm exp...

Re: Sigma-Delta Modulation into Butterworth Filter versus Ideal Lowpass Filter

"Jerry Avins" wrote in message news:2tq3vtF21qhftU1@uni-berlin.de... > Randy Yates wrote: > > ... > > > Jeremy, > > > > Depending on the nature of the "garble" you are observing, this may > > have nothing to do with the filter. A delta sigma modulator will > > introduc...

Re: Reconstruction Filter behind DAC

Hi, I have not all the characteristics but my question was : Output are differentials so is it designable such a normal filter or is it special ? I have seen a chebyshev type II on the evaluation board but i don't know how thy design it. Thanks Guillaume > > > gui076 wrote: ...

ADSP2181 IIR filter help needed please

Hi all, I have designed a 4th order bandpass filter using MatLab FDA tool. The filter contains 2 2nd order stages which is fine and I can view them in Simulink. The filter is a chebyshev type 1 with fp1=300Hz fp2=3kHz. I have the coefficients and scaling factors but have no idea how to code a ca...

Re: filtering question

"doggie" wrote in message news:l6idnRp1OsyT3fLZRVn-tg@giganews.com... > Hi all, i have a question on filtering here.apparently my filter plot > shows > it can get rid of frequency up to 0.017. here's the code,just cut and > paste. > > %--------------------------------------------...

Re: Help with Orfanidis filters

Jerry Avins wrote: > > How closely do Orfanidis's and L.B-J's low shelves compare? Jerry, there is a recent paper (later than that first one he did for JAES) from Orfanidis that sorta maps higher order LPF prototypes (where you can use Butterworth or Chebyshev type 1 or 2 or something else)...