Generalized Cross Product

Started by Greg Berchin in comp.dsp3 months ago 19 replies

I have a pair of N-dimensional vectors, N large (hundreds), and I need to generate another N-dimensional vector that is orthogonal to the first...

I have a pair of N-dimensional vectors, N large (hundreds), and I need to generate another N-dimensional vector that is orthogonal to the first two. It doesn't have to be unique; it doesn't even have to be perfectly orthogonal, as long as the normalized dot products are less than, oh, about 0.005. I've searched for "generalized cross product" and similar terms, and all I found was a


Shannon and Sphere Hardening

Started by Tim Wescott in comp.dsp3 months ago 15 replies

So, I'm toying with Shannon's capacity theorem, trying to graph out the "sphere hardening" effect that he cites as the basis of the...

So, I'm toying with Shannon's capacity theorem, trying to graph out the "sphere hardening" effect that he cites as the basis of the principle. I can see, intuitively, how the whole notion that the volume of a sphere is concentrated in a thin shell works, but when I try to calculate actual numbers I start running into numerical difficulties at dimensions of around 150 or 200. Even wit...


OT: Flash Memory

Started by Randy Yates in comp.dsp3 months ago 28 replies

Gentle comp.dsp People, I've been involved on several projects over the past few years that utilize flash memory in microSD form, and several...

Gentle comp.dsp People, I've been involved on several projects over the past few years that utilize flash memory in microSD form, and several times they have inquired about problems with lifetime of such cards. My employer recently tasked me with investigating the alleged write lifetime issue. Frankly I was appalled at the numerous, significant issues I found in current-day cards. Doe...


Constitutional encoding/ decoding

Started by somedspguy in comp.dsp3 months ago 3 replies

Having a hard time figuring out how to properly do soft decoding with vitdec for bpsk. I tried using 'unquant' but my results are the same as hard...

Having a hard time figuring out how to properly do soft decoding with vitdec for bpsk. I tried using 'unquant' but my results are the same as hard decision decoding. trellis = poly2trellis(4,[11 15]); for i = 1:7 for q = 1:n_block %create coded message code = convenc(msg(:,q),trellis); %convert to bpsk code_bpsk = 2*code-1; %add noise tx = code_bpsk' + sqrt(No(i)/2)*...


OT: AEC

Started by Mauritz Jameson in comp.dsp3 months ago 3 replies

I am working on a project and looking to license a commercial-grade software AEC. How much should I expect to pay to license a SW AEC and how much...

I am working on a project and looking to license a commercial-grade software AEC. How much should I expect to pay to license a SW AEC and how much in royalty per unit. I expect that it will be used in 10000 units the first year. Thanks.


Overlapping sub bands in WOLA channelizer

Started by Paul Green in comp.dsp3 months ago 8 replies

Hi, I would like to create a WOLA channelizer with overlapping passbands, say 25%, but I'm struggling to see how I could do this as my...

Hi, I would like to create a WOLA channelizer with overlapping passbands, say 25%, but I'm struggling to see how I could do this as my math isn't up to it. I can imagine having two channelizers operating on overlapping input samples and then interleaving the output from the channelizers to increase the sample rate but I'm pretty sure this doesn't get me much closer. Anyone been down this r...


Why is Dolph-Chebychev windowing relatively obscure?

Started by Eric in comp.dsp3 months ago 22 replies

Most software seems to focus on Hann, Hamming, and Blackman windowing. From the graphs I've seen, Dolph-Chebychev appears to outperform...

Most software seems to focus on Hann, Hamming, and Blackman windowing. From the graphs I've seen, Dolph-Chebychev appears to outperform them: https://en.wikipedia.org/wiki/Window_function#Dolph.E2.80.93Chebyshev_window Anyone know why it isn't featured in DSP texts to the extent of the other windows above? Are there drawbacks?


biomedical signal processing courses?

Started by Anonymous in comp.dsp4 months ago 2 replies

One of the universities I attended had a degree in Medical Imaging, which covers X-rays, MRI, ultrasound, PET et cetera. Now there is a seperate...

One of the universities I attended had a degree in Medical Imaging, which covers X-rays, MRI, ultrasound, PET et cetera. Now there is a seperate discipline, which I would guess is called "biomedical signal processing" that covers 1D signals such as heartbeat, brain waves, eye and muscle activity. Do many colleges offer this as a specialist degree?


What kind of analog circuit has a bad group delay spec?

Started by fl in comp.dsp4 months ago 10 replies

Hi, I was asked by someone about this question: "What kind of analog circuit has a bad group delay spec?" I only know some analog circuit...

Hi, I was asked by someone about this question: "What kind of analog circuit has a bad group delay spec?" I only know some analog circuit having good group delay spec, not the opposite. Do you know the answer? Thanks,


LFSR in java

Started by dahawi amer in comp.dsp4 months ago 10 replies

hi please help me to programmed linear feedback shift register algorithm in java

hi please help me to programmed linear feedback shift register algorithm in java


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