Brewster LaMacchia (@lamabrew)
I had a copy of the ITT Reference Data For Radio Engineers 5th edition (1968) given to me in the late 70s when my budding interest in technology was much younger. ...
.For anything other than dirt cheap AKM are pretty much the only source I consider for high performance audio ADC/DACs. To me this DSP seems to be aimed at large...
I think the joke is there's only faulty reasoning going on.The whole story can be condensed down to: The hotel owner forgave a £50 debt.I don't see anything related...
some questions:How fast is the frequency changing? Does it change monotonically?Is there truly just one frequency peak? what is the SNR? Is the noise really...
Your application will run on a fast ARM core, though there's parts in the TI family that include a DSP (C6x) core. I think it comes down to what you want to get...
You didn't put detail in as to why you want a board vs. doing something on a Windows/Linux PC. If you're experimenting not having to cross compile makes things...
My suggestion would be to start with off the shelf hardware so you can gain some experience and then work towards rolling your own. The lack of audio parts (ADC,...
I'm not clear as to exactly what you're trying to build and its architecture, but the only practical way to decode SPDIF is with a SPDIF receiver. Either a standalone...
(apologies to @artmez, when I started writing this there were no other replies and it was 2 days old. We must have both posted at the same time)I was hoping one...
Hi An,No problem. I wrote that a bit tongue-in-cheek, i.e. gave you answers of No, Maybe, and Yes, all perfectly correct in response to your question as stated.I...
Sure, if your audio (data) is at a low enough sample rate, the answer is a resounding yes. (8 bit audio at 8 kHz - no problem)...but that's probably not the answer...
I'll second all of the excellent comments that have been made, and I'll throw out a couple of suggestions too.I think for someone in your position is the journey...
Ah, got it. Barring some clever way to fold that table due to some symmetries of some sort (just a WAG that there might be some) really then it's a tradeoff between...
Not to drag this out, but why are you using a 16 bit table? 8 bits drops the rate to to a very manageable value and you could take it down to 500 Hz or so and...
You can't manipulate PDM (or PWM) data mathematically (AFAIK...maybe someone else knows). In the end it's nothing more than a "value" of some signal and it's the...
Thanks for the detailed explanation. Did you look at this older post?https://www.dsprelated.com/thread/6809/mcu-signal-...in addition to the ST app note referenced...
I think I made an oops from reading your original question. It's not the filter output that's at 1 MHz, that's the PDM rate? What is the rate out of the filter/downsampler...
What bandwidth are you looking across for the RMS measurements? If this is AC (mains) power then unless it's some exceptional condition you're chasing probably...
Not sure what your sample rate and bandwidth are, but the long hanging fruit on this would be to filter and decimate to reduce the amount of data.
I read this as sounding like extending the "trick" of reducing FFT complexity by 2 when the input sequence is real (i.e complex ={0}) since you know the output...
Not directly answering your question in terms of algorithms, but in terms of a really good measurement tool and a fairly extensive writeup check out REW (Room Eq...
Northeastern in Boston (where I have one child in an undergrad eng. program ) is $52K for tuition (only) for a MSEE. A room in a shared apartment is another $12K+...
Total W.A.G. here since there's no details as to what is meant by damping filter, nor code, etc, but looking at that plot it looks like maybe you have 8 bit math...
Can you tell us what problem you're trying to solve? Maybe a FFT/IFFT isn't the right approach. (here comes the 20 questions) If I understand it the data is...
For me, whenever I got myself confused on this, I fall back on "calling one side of the transform time and the other frequency is just a convention (yeah, I mighty...
There's a couple of things in what you state that don't sound quite right to me, but I've also been away long enough from the details that I'm probably wrong about...
The responsive design fixes would be good - I try and avoid serious reading on my phone but sometimes while waiting for something it's how I get caught up. I'm...
If you don't have need for extreme speed in what you want to do (you used the word 'basic' so I assume this is the case) I would suggest one of the ARM M7 or new...
Fred's response is spot-on, I'll throw in some additional things I've seen that might be a problem in some cases. If one (or more) of the sources are coming over...
Hi Rick,Sorry I should have been clear when I made that link/reference; you are correct about what was on that page but I should have said "start with this page...
Hi Rick,I fell in to that "trap" recently; I may have missed something fundamental but I played around with a couple of Matlab scripts to investigate. The short...
Hi @ctlee,I usually find myself using a ramp as the fast + to - transition can provide a good marker for measuring time, i.e. if I want to get the exact frequency...
I should have added that I find using a ramp waveform is extremely helpful to find that occasional sample where you're "off by 1" and then debug the code - if you...
Having just spent the last month working on a project that used FFT/IFFT for a slightly different purpose with overlap/add, I found Julius Smith's book extremely...
Darn let me correct myself before I confuse things further...pink noise has equal energy per octave, which means the power drops off at -3dB/octave.
If the red in your plot is the FFT results then that's not the FFT of typical pink noise. BTW for any given FFT there is going to be significant variation (it's...
What you're describing sounds like the scheme cable TV used in the 80s to 'block' movie and porn channels. The (analog) waveform was 'distorted' (sync pulse messed...
Surprised nobody mentioned Inkscape. https://inkscape.org/en/ For a long time it was a package with potential but it's now to the point where it can handle what...
Others have addressed why C1 has to be there. I would like to add my $0.02 about the requirement that one side of the speaker must be grounded. If this is the case...
Couple of questions/ideas:What happens when you change the level of the signal generator? Does the mystery component change level too?What happens when you change...
At the risk of being redundant with the other answers, your original question basically asked how to (in an equivalent analog domain) low pass filter a 1 MHz bandwidth...
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