## Forums comp.dsp

## Scaling Coefficients to unity peak

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

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-]

## Verification of the following formula

inHello 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

inIn 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

inI 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...

## Old DSP Instructional videos on VHS tapes

inHi, In Julius' 5/18/15 reply to my post (Subject: An interesting historical DSP article) he mentioned the existence of old DSP...

Hi, In Julius' 5/18/15 reply to my post (Subject: An interesting historical DSP article) he mentioned the existence of old DSP instructional videos recorded on VHS tapes. As it turns out, I own the following VHS tapes: IEEE IEDM-DSP "Fundamentals of DSP" (Part 1 of 4) by a Ronald Schafer IEEE IEDM-DSP "Applications of DSP" (Part 2 of 4) by a James McClellan...

## FFT upsampling filter

inHi, all: New member here. I did a search, but it seems there is no information related to this topic. What I am doing now is I am trying to...

Hi, all: New member here. I did a search, but it seems there is no information related to this topic. What I am doing now is I am trying to upsample some data points to a much higher sample rate, and to do that, I need a low pass filter after zero stuffing. There are 2 ways to reduce calculation complexity, AFAIK: a. To use a polyphase filter at input sample rate, or b. To use a FFT fil...