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Question about DSP in Matlab (beginner)

Started by JCO_DSP in comp.dsp2 hours ago 11 replies

Hi, I'm starting to learn DSP (Matlab )and I have two questions about it, maybe someone can help me out? I'm trying to measure a frequency...

Hi, I'm starting to learn DSP (Matlab )and I have two questions about it, maybe someone can help me out? I'm trying to measure a frequency from an Audio Device and I'm using FFT to transform it from the time domain to the frequency domain. But I am doing a downsample before the FFT. But you can also do it after the FFT. Do you know what would be the most efficient (before or after)? And why?...


How Shit Happens

Started by robert bristow-johnson in comp.dsp6 hours ago 1 reply

In the beginning was the Plan. And then came the Assumptions. And the Assumptions were without form. And the Plan was without...

In the beginning was the Plan. And then came the Assumptions. And the Assumptions were without form. And the Plan was without substance. And darkness was upon the face of the Workers. And the Workers spoke among themselves, saying, "This is a crock of shit, and it stinks." And the Workers went unto their Supervisors and said, "It is a pail of dung, and we can't live with the ...


Scaling Coefficients to unity peak

Started by spetcavich in comp.dsp1 day ago 2 replies

I had this exercise to design a filter using the remez algorithm in matlab and without coefficient scaling I quantized them to N bits and...

I had this exercise to design a filter using the remez algorithm in matlab and without coefficient scaling I quantized them to N bits and then scaled them to unity peak and compared these spectrums to each other. The spectrum without scaling did not meet specifications for stop band attenuation while the scaled did. I get that scaling the coefficients maximizes the value range the coefficient...


FEC for Burst FSK

Started by mite_learner in comp.dsp2 days ago 15 replies

Hi all, I started working on FEC for burst FSK system over multipath channel. I want to ask the community here about what type of FEC would be...

Hi all, I started working on FEC for burst FSK system over multipath channel. I want to ask the community here about what type of FEC would be best for such system. Which type of FEC is being used in existing FSK systems? Any pointers to literature and implementation work would be welcomed. -- Sam --------------------------------------- Posted through http://www.DSPRelated.com


How/Why a digital signal is inherently more immune to noise?

Started by a.s. in comp.dsp2 days ago 25 replies

The primary advantage of digital transmission over analog transmission is Noise Immunity. A digital signal (in comparison to an analog signal)...

The primary advantage of digital transmission over analog transmission is Noise Immunity. A digital signal (in comparison to an analog signal) is inherently more immune to noise. Why the word "inherent"? Please make it more clear to me. --------------------------------------- Posted through http://www.DSPRelated.com


4x3 job shop scheduling problem - matlab

Started by hadeelhmoud in comp.dsp3 days ago 1 reply

Hi, I have a 4x3 job shop scheduling problem that I need to find it's optimal solution using matlab codes. I have the codes ready but need to...

Hi, I have a 4x3 job shop scheduling problem that I need to find it's optimal solution using matlab codes. I have the codes ready but need to modify them a little bit. first code is swarm, already designed for a 6x6 I could change it to 4x3 but the output is given as a gant chart of 6x4 [ 6 machines] so we need to fix that. second code is genetic, it's problem is that it gives me the sam...


An interesting historical DSP article.

Started by Rick Lyons in comp.dsp4 days ago 4 replies

Hello Earthlings, I just ran across an interesting article, by Alan Oppenheim, regarding the early history of DSP. If you have nothin'...

Hello Earthlings, I just ran across an interesting article, by Alan Oppenheim, regarding the early history of DSP. If you have nothin' better to do, you might enjoy having a look at that article. It can be found at: http://www.rle.mit.edu/dspg/documents/Oppenheim-2012-Algorithm-Kings.pdf [-Rick-]


Verification of the following formula

Started by sia4uin in comp.dsp4 days ago 12 replies

Hello All, Me again! I came across the following formula to calculate pitch from accelerometer signals. pitch = atan2(Ay,...

Hello All, Me again! I came across the following formula to calculate pitch from accelerometer signals. pitch = atan2(Ay, sqrt(Ax^2+Az^2)) Is this correct? Now a slightly complicated stuff. Found this video and it is very interesting and of course it is not for novices like me. https://youtu.be/C7JQ7Rpwn2k?t=1415 How does he obtain Gravity to obtain Linear acceleration? ...


J.83-B 256-QAM

Started by jsrolland in comp.dsp4 days ago 2 replies
QAM

In J.83-B 256-QAM: Considering the FEC Frame 40-bit frame sync trailer: ---7 1---|---E 8---|---4 D---|---D 4---|-cw- 0--- 0111 0001 1110...

In J.83-B 256-QAM: Considering the FEC Frame 40-bit frame sync trailer: ---7 1---|---E 8---|---4 D---|---D 4---|-cw- 0--- 0111 0001 1110 1000 0100 1101 1101 0100 xxxx 0000 as defined in Figure B.10/J.83 Suppose the Control Word is 0 for a I = 128 and J = 1. We interpreted the spec so that these are inserted as follow in the 5 last trellis group of a FEC Frame: 2072/2076 2073...


Time Delay of a FIR filter

Started by adnanyusuf in comp.dsp4 days ago 22 replies

I came across this online : "2.1.4 What is the delay of a linear-phase FIR? The formula is simple: given a FIR filter which has N taps, the...

I came across this online : "2.1.4 What is the delay of a linear-phase FIR? The formula is simple: given a FIR filter which has N taps, the delay is: (N - 1) / (2 * Fs), where Fs is the sampling frequency. So, for example, a 21 tap linear-phase FIR filter operating at a 1 kHz rate has delay: (21 - 1) / (2 * 1 kHz)=10 milliseconds." I think the formula should be (N-1)/(Fs). For example assum...


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