Hilbert transforms and sampling rate?

Started by MatthewA in comp.dsp4 months ago

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


OT: Those arithmetic questions

Started by Anonymous in comp.dsp4 months ago 23 replies

Often you see questions on social media such as - find the answer to 9/3(1+2) (they usually use the divide symbol which nobody uses of course...

Often you see questions on social media such as - find the answer to 9/3(1+2) (they usually use the divide symbol which nobody uses of course so= I have replaced it with a slash) and they spout on about order of operations and so left to right the answer= is 3x 3 =3D9 and the catch is that people answer 9/9 =3D 1. Ha, they don't= know their order of operations which was agreed by conve...


Shifting the Sinc filter in the frequency domain

Started by runinrainy in comp.dsp5 months ago 1 reply

Hello, 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.

Started by robert bristow-johnson in comp.dsp5 months ago 20 replies

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...

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

Started by Wilton Helm in comp.dsp5 months ago 8 replies

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...

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

Started by Anonymous in comp.dsp6 months ago 1 reply

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...

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

Started by Anonymous in comp.dsp6 months ago 1 reply

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...

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)

Started by Mauritz Jameson in comp.dsp6 months ago 10 replies

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...

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

Started by RichD in comp.dsp6 months ago 1 reply

Consider 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...


How to convert from PDM to PCM ?

Started by Mauritz Jameson in comp.dsp7 months ago 34 replies

I have a client who is using a MEMS microphone (SPM1423HM4H-B, 3.125MSPS). The output of the microphone is a PDM...

I have a client who is using a MEMS microphone (SPM1423HM4H-B, 3.125MSPS). The output of the microphone is a PDM signal. Datasheet: http://media.digikey.com/pdf/Data%20Sheets/Knowles%20Acoustics%20PDFs/SPM1423HM4H-B.pdf In the client's test setup an emitter emits an acoustic signal. The emitted signal has frequency components around 40kHz. When I reviewed the client's setup, I noticed a c...


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