## Forums comp.dsp

## Question about DSP in Matlab (beginner)

inHi, 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?...

## PSD of a sequence of independent random PAM symbols ?

inHi, I'd like an explanation of the PSD of a sequence of independent random PAM symbols or amplitude +1 or -1. Now any standard textbook tells...

Hi, I'd like an explanation of the PSD of a sequence of independent random PAM symbols or amplitude +1 or -1. Now any standard textbook tells us that the PSD is the Fourier Transform of the autocorrelation of the signal, in my case the symbols are INDEPENDENT and => the autocorrelation is non-zero only over the symbol duration 'T', beyond this it goes to zero. Going through the maths I come ou

## Digital Upconversion using the baseband data(IQ) files

inHi all, i want to upconvert the baseband data (complex data). i have code for upconverting but struggling to implement interpolater...

Hi all, i want to upconvert the baseband data (complex data). i have code for upconverting but struggling to implement interpolater (resampler) before upconverter and i need to implement a filter after the upconverter. so can any one help me to implement both resampler and filter . Iam trying to upconvert a baseband to 70Mhz IF . Thanks in advance.

## Does anyone know where to find the detail about SRS TruDialogue?

inHi, SRS TruDialogue technology is widely used in consumer audio product. I want to know its detail, but cannot find any document on-line. It...

Hi, SRS TruDialogue technology is widely used in consumer audio product. I want to know its detail, but cannot find any document on-line. It has been patented for some years. Could you tell me where I can find its principle description? Thanks,

## How Shit Happens

inIn 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

inI 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

inHi 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?

inThe 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

inHi, 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.

inHello 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-]