RF engineer SW and HW development in measurement and control electronics currently busy in VHDL signal acquisition and conditioning

Re: Running Sum filter

Reply posted 1 month ago (01/27/2020)
So ... your 0.6 µs is really (1/1.563MHz) ??OK. And you're doing proper upsampling to 16 MHz?For example with zero stuffing between the real values ...And you certainly...

Re: Running Sum filter

Reply posted 1 month ago (01/27/2020)
Hi Adira, just for my understanding (to be able to follow the thread...):ADC reading every 0.6µs -> 1 /1.6MHz means you're sampling with a sample rate Fs=1.6MSps,...

Re: damping filter - finite stationary error

Reply posted 3 months ago (11/27/2019)
I agree with lamabrew. Your inputs are very little, so you cannot expect much help.But given that you cannot change the resolution, the result seems perfectly filtered.If...

Re: ADC and Complex Mixer Nyquist question

Reply posted 4 months ago (11/07/2019)
Another approach: imagine a complex signal, having two components, if we look at it in Cartesian representation: (real,imag)Now you feed your system (through ADC)...
If I didn't miss the point: changing the frequency cannot leave the phase unchanged, because a higher frequency means the phase is changing faster, so you cannot...

Re: Setting up codec on ADSP 21489

Reply posted 4 months ago (10/23/2019)
Years ago, I faced the same challenge.As djmaguire stated, digging into the details requires a lot of patience and devotedness... but it's worth the effort.The most...
You're right, there's a lot of problems if computers deal with time, especially if they have to derive different time-related values with different representations.But...

Re: DSP for design verification

Reply posted 6 months ago (08/14/2019)
Hi Ivan,maybe it's not what you expect or what is in your interest, but if I'd be interested in rise/fall times or level uncertainties, I'd not try to solve such...

Re: OFF TOPIC: A Question About PI

Reply posted 8 months ago (07/01/2019)
I agree, my claim 2 is not correct, because adding the value '0' results in the original value, at least here.So, I should have noted: "adding any value other than...

Re: OFF TOPIC: A Question About PI

Reply posted 8 months ago (07/01/2019)
Interesting approach. There's one issue to remember: pi has been proven to be irrational.You're example with 1/3 deals with a rational number, therefore you have...

Re: OFF TOPIC: A Question About PI

Reply posted 8 months ago (06/28/2019)
I'm sure you're not in danger to getting psychotic because of touching the area of number theory (otherwise I'd be hospitalized for long ;-).But if you're trying...

Re: OFF TOPIC: A Question About PI

Reply posted 8 months ago (06/28/2019)
Take this challenge: what is the result of the division of  0/0 ?0? or 1? or 5?I'll help you a little:   sin(x)/x  at position 0 ?and now, (5*sin(x))/x  or...

Re: OFF TOPIC: A Question About PI

Reply posted 8 months ago (06/28/2019)
Again, you'll find this question already solved in numbers theory.The scaling of rational numbers in fact led to the necessary existence of irrational numbers. Centuries...

Re: OFF TOPIC: A Question About PI

Reply posted 8 months ago (06/28/2019)
sorry, that I had been not precise enough in my "speaking":Since the quest was that pi contains each number, it would have not been a proof if I would take let's...

Re: OFF TOPIC: A Question About PI

Reply posted 8 months ago (06/27/2019)
I guess that statement is correct, although very!! irritating. I enjoyed an old book about a mathematician (Cantor) who was dealing with natural numbers, with alike...

Re: Sign of the magnitude difference

Reply posted 9 months ago (06/11/2019)
Solve it graphically: draw a vector z1 on a paper: let's say quadrant 1, starting from (0|0).then draw a vector z2 starting from the endpoint of z1, into any other...

Re: Somewhat Off Topic: Manipulating a PDF File.

Reply posted 9 months ago (05/15/2019)
Hi, Rick.If you are willing to use python for this purpose, which might give you quite a lot of more possibilities, it's worth checking the link below.Just copy/pasting...

Re: What's your favorite modern DSP chip?

Reply posted 10 months ago (05/07/2019)
We're working a lot with FPGAs. You can get really cheap devices meanwhile, so price is not an issue. But if it comes to algorithms, I'd not deliberately choose...
When it comes to debugging FPGA code, bugs/monsters don't look at you!They hit back immediately :-[

Re: Time delay

Reply posted 11 months ago (04/08/2019)
I'm very unfamiliar with all this cardioid things.But if I had to design an IIR-bandpass-filter, I'd probably start with a bode diagram and butterworth filters,...

Re: Time delay

Reply posted 11 months ago (04/08/2019)
From the paper, I assume that you do NOT want to compensate for the delay between the microphone signals but instead want to preserve the delay (?) because it contains...

Re: Time delay

Reply posted 11 months ago (04/04/2019)
Some hints ...1. IIR-filters are not "really" computationally cheaper than FIR-filters. They are different. Typically IIR filters cost more word-length during calculation,...

Re: Fixed Point vs Floating Point

Reply posted 1 year ago (11/30/2018)
Imagine your digital signal stored in a serie of flip-flops (register).We'll find out a lot which may answer your questions by imagining this register.First: bit...
This is not a mathematical proof, but maybe it helps to lead you to the right track...Convolution is basically nothing but multiplications and sums. Clipping is...
Think in terms of FFT:The real spectrum of your audio is infinite, but sampling (let's say 48kS/s) will limit it to Fs/2 (-> 0..24kHz). FFT transforms the linear...

Re: How to cancel REALLY heavy echo?

Reply posted 1 year ago (09/20/2018)
I'm not in that business, but if you would introduce a (recognizable but nearly unhearable) pattern in the voice signal, maybe you could detect that pattern in the...
High Q ends up with the same problem as a high Fs/Fcut in HPF.Therefore my guess is that your issue is not at first limit cycling (maybe later ;-), but the described...
Many years ago, I was trying to implement an IIR high-pass filter in audio-like frequency range: Fs=48kS/s, Fcut=1.5Hz (HP), 6th-order butterworth.The filter seemed...
J join your opinion, oliviert. That's what I figured out, too.

Re: Fundamental frequency of a Guitar string

Reply posted 2 years ago (07/02/2018)
While I agree with Tom and the others sharing their experience and questioning if you can really expect only harmonic content , just some hints from my side:often...

Re: DSP board selection

Reply posted 2 years ago (06/13/2018)
You may want to check www.danvillesignal.com for a solution with real (Shark) dspIf it's only to get analog signals into/outof a PC: check NI/DAQpad via USB

Re: A Mathematical Notation Suggestion

Reply posted 2 years ago (05/22/2018)
I shudder if I imagine a mathematical approach containing something like "x element of domain of Real numbers greater than zero "D. Knuth's TEX-"language" provides...

Re: Digital Image Processing

Reply posted 2 years ago (02/28/2018)
A quick look to the s(nx) definition makes me assume that in the spectral domain you see not a single line as would be ideal for a sine response in the cont.math...

Re: A Sinusoid with Missing Periods

Reply posted 2 years ago (02/15/2018)
I would set up a sort of PLL. Its output should give a steady sinus without missing periods.Needs to be locked to the incoming Signal.Depending on its setup it has...

Re: Impulse behavior of FIR LP filter

Reply posted 2 years ago (01/15/2018)
Sounds interesting.I guess that all you guys are right, it's a big challenge, very close to the physical limits. So the only real chance is to find that approach...

Re: Impulse behavior of FIR LP filter

Reply posted 2 years ago (01/15/2018)
Thanks for your estimation.

Re: Impulse behavior of FIR LP filter

Reply posted 2 years ago (01/12/2018)
When I tried to insert the above figure (drag and drop) it was there until I pressed "submit". After that it was not visible any more.I tried that again, it failed...

Re: Impulse behavior of FIR LP filter

Reply posted 2 years ago (01/12/2018)
Coefficient resolution should not be a problem (filtering will be done in OpenCV on graphics card of a PC board, so tends to be 32 bits FP or better).Transmission...

Re: Impulse behavior of FIR LP filter

Reply posted 2 years ago (01/12/2018)
Hi Fred, you got it. In the first row of your img the first sine shows a lower amplitude than the following. If only one sine pulse would be there, it's obviously...

Re: Impulse behavior of FIR LP filter

Reply posted 2 years ago (01/12/2018)
OK. I agree, that I could have given more detailed information about the signal flow around the filter...more backgroundIt's a measurement signal coming from ADC....

Re: Impulse behavior of FIR LP filter

Reply posted 2 years ago (01/11/2018)
Thank you for your input.Yes, the 3% value is what I would have expected, and as my graph shows depends on how good the peak of the pulse is hit.I tried with different...

Impulse behavior of FIR LP filter

New thread started 2 years ago
Hi all,my question may sound trivial, but maybe I need a kick into the right direction, so I appreciate your ideas...background: A pulse (best described as a singular...

Re: IIR filters

Reply posted 2 years ago (11/30/2017)
As probbie already pointed out, IIR filters are necessary, if we want comparable results as with analogue filters. That's the reason why I use them:Previously we...

Re: fft/ifft scaling revisited

Reply posted 2 years ago (11/28/2017)
It is mainly a matter of practical usefulness. Because, as you propose, it would be possible to normalize the factors to 1.But, if you do it as it is, this means...

Re: Off Topic: A geometry problem

Reply posted 2 years ago (11/16/2017)
My idea to consider the right or left rim was overshoot:Only thinking about a parking position far left from B or right from A makes clear that ways are always increasing....

Re: Off Topic: A geometry problem

Reply posted 2 years ago (11/16/2017)
If a compass and straight-edge solution is required, derivations are certainly not allowed, although I would tend to that approach too, since it's quite straight-forward.The...

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