## Forums More comp.dsp

## Matched filter chiprate issue

inHi all, I have received a transmission which consists of a series of PN sequences. I recorded at 8*10^6 SPS (8 MSPS) and wish to perform a...

Hi all, I have received a transmission which consists of a series of PN sequences. I recorded at 8*10^6 SPS (8 MSPS) and wish to perform a matched filter on it. The transmission binary sequence is 1*10^6 bits long and I have just been informed that it was transmitted at a rate of 1,016,118.24682 bits/sec which seems like a very strange chip rate to pick but unfortunately this is beyond my ...

## Doppler correction, SatCom channel.

inHi, I am looking at a Goldcode transmitted from a LEO satellite and want to perform a matched filter on it. The problem is there is a...

Hi, I am looking at a Goldcode transmitted from a LEO satellite and want to perform a matched filter on it. The problem is there is a significant amount of doppler (20kHz) which degrades the performance of the matched filter significantly. If I have a chunk of this signal (quadrature sampled) what would be a good approach to negate the affects of the doppler? Any input will be much apprec...

## Hilbert transforms and sampling rate?

Hi all, My knowledge of biquad filter coefficients isn't great but from what I've experienced, they change based on sampling rate. but I've...

Hi all, My knowledge of biquad filter coefficients isn't great but from what I've experienced, they change based on sampling rate. but I've bumped into these two examples of hilbert transforms online and neither takes sampling rate into account. Are they okay to use or are they just based on 44.1kHz? Thanks, Matt // hilbert quadrature filter hilbertBiquad(x0) { x1 = biq

## Shifting the Sinc filter in the frequency domain

inHello, The following example from dsprelated.com shows the design of Sinc filter with the following parameters. The link of the example as...

Hello, The following example from dsprelated.com shows the design of Sinc filter with the following parameters. The link of the example as below; https://www.dsprelated.com/freebooks/sasp/Example_1_Low_Pass_Filtering.html With the Matlab command fftshift the frequency response of the filter is centered at 0 frequency which is 256 the frequency bin. My question is, how can I move the c...

## wow. it starting to look like USENET is getting pretty dead.

inthis used to be a very active newsgroup. nothing happening since Oct 17 and now it's Nov 2. sorta gets eclipsed by Stack Exchange (which...

this used to be a very active newsgroup. nothing happening since Oct 17 and now it's Nov 2. sorta gets eclipsed by Stack Exchange (which allows for formatting math equations and pasting in graphics). r.i.p. comp.dsp i guess we all die sometime or 'nother. r b-j

## CIC interpolation implementation

inI sent this to Rick, but thought maybe a wider reading would be beneficial. I'm designing a CIC interpolating filter (N = 3, M = 1, R = 15 if it...

I sent this to Rick, but thought maybe a wider reading would be beneficial. I'm designing a CIC interpolating filter (N = 3, M = 1, R = 15 if it matters) and I came to a realization I hadn't had before and haven't ever heard anyone else mention. That often means there's something badly wrong with it, but I don't see it. Let's start with the traditional implementation:

## Control loop Question

inIf you have say a speed loop for a motor and an inner current loop, what spec should the inner loop have relative to the outer? I am assuming the...

If you have say a speed loop for a motor and an inner current loop, what spec should the inner loop have relative to the outer? I am assuming the inner current loop should have a much higher bandwidth otherwise it will interfere with the outer loop. Is this how it is usually done?

## Korenberg's fast orthogonal search

inHas anybody used this algorithm? It seems to be what I need; fitting 2 or 3 sinusoids to sampled data, where those sinusoids have arbitrary...

Has anybody used this algorithm? It seems to be what I need; fitting 2 or 3 sinusoids to sampled data, where those sinusoids have arbitrary frequencies (not harmonically related as in discrete fourier transform).

## POLQA (ITU P863)

inI downloaded the P.863 POLQA source code from the ITU website. As far as I can see there is no guide to how the project should be built. So I...

I downloaded the P.863 POLQA source code from the ITU website. As far as I can see there is no guide to how the project should be built. So I created a new console application (empty project) in Visual Studio and added Main.cpp to the project. The first error I get when I try to build is: 1> ------ Build started: Project: polqa, Configuration: Debug Win32 ------ 1> Compiling... 1> Main.cp

## Rayleigh vs. Nyquist

inConsider the Nyquist criterion for sampling a continuous=20 waveform - 2x bandwidth - then the Rayleigh resolution=20 principle - peaks must...

Consider the Nyquist criterion for sampling a continuous=20 waveform - 2x bandwidth - then the Rayleigh resolution=20 principle - peaks must separate by at least 1 wavelength. =20 Don't these look much analogous? =20 Especially as =CE=BB =3D 1/f Ruminating a bit more... Nyquist sampling can be=20 viewed as a mandate to sample each period, at least=20 twice. And, Rayleigh mandates that...

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