DSP

Should the normal SINE and Zero padded SINE curves be the same for fft output?
On Apr 22, 6:49 am, Rune Allnor <all...(a)tele.ntnu.no> wrote: On 22 apr, 11:43, "rsk" <kalerahul(a)n_o_s_p_a_m.yahoo.com> wrote: Sorry for touching this after long time. First of all thank you all for answering my questions eventhough they might be trivial for you. Here is a followup qu... 23 Apr 2010 20:39

AM digital demodulation methods
HardySpicer wrote: Synchronous demodulation using a PLL will give you 3dB improvement over ordinary envelope detection. This is wrong. Synchronous demodulation makes improvement from 0dB to infinity, depending on SNR. The problem arrises when you want to do synchronous demod and the carrie... 23 Apr 2010 17:25

Signal synchronization in the presence of noise
Hello, I am looking for ideas to synchronize an incoming signal with a template signal. I also want to detect if the incoming signal is valid or not. For this, I cross-correlate a small length of the input signal with the template. This seems to work fine. How can I then find out a synchronization point b... 20 Apr 2010 15:43

PWM
DEAR ALL, KINDLY CLARIFY THE FOLLOWING STATEMENT FOR ME:- 1) FOR PWM GENERATION:- IF MY T1CNT i.e counter for counting up/down starts from say x that is in betweem 0 and T1PR value. So I suppose the counter will start from x(value between 0 and T1PR) and goes up to T1PR and then counts down to x. and then again g... 20 Apr 2010 15:43

FIXED POINT TO FLOATING POINT
Dear All, I am currently using fixed point DSP F2810. Now what advantage i will get if i get shifted to floating point. I mean i use IQ math library in fixed pt. DSP so virtually its floating point DSP. So is there any diffrence or there will be speed difference as there will be no conversion of IQ math is ... 20 Apr 2010 15:43

Confused with Notation
So some of the papers I am looking at represent convolution in 'matrix' form in one of two ways: y[n] = H^H * X where H^H = hermitian (conj transpose) of filter H and y[n] = H^t * X where H^t = transpose of filter H Why is the first formula conjugated? To get a better sense of what I mean..incase my notati... 20 Apr 2010 15:42

If light, why not radio?
http://michigantoday.umich.edu/2010/04/story.php?id=7725 -- "It does me no injury for my neighbor to say there are 20 gods, or no God. It neither picks my pocket nor breaks my leg." Thomas Jefferson to the Virginia House of Delegates in 1776. �������������������������������������������������������������... 20 Apr 2010 15:42

What is Bit Spread?
Hi, I'm reading Andrew N. Sloss's book <<ARM System Developers Guide-Designing and Optimizing System Software>>. There is a description about Bit Permutation. I extrat several lines of code here: 7.6.2.1 Bit PermutationMacros mask0 EQU 0x55555555 ; set bit positions with b0=0 mask1 EQU 0x33333333 ; set bi... 16 Apr 2010 03:59

MMSE & LMS Equalization Question
Ok so, i'm confusing myself somewhere and its driving myself crazy. I have written matlab implementations of MMSE (wiener) and LMS (gradient method .. h = h(n-1) + mu*dE/dh) to minimize the following equation: ( s[n] - yhat[n] )^2 where s[n] is the original 'sent' message and yhat[n]=conv(Hhat,y[n]) where y... 16 Apr 2010 18:25

Hilbert Transform Phase
Hi all, I am a newbie to Hilbert transform. I found the follow definition from textbook H(f) = -j or -90degree, f>0 H(f) = j or +90degree, f<0 H(f) = 0, f=0 But when I plot the phase out in Matlab, I saw that the phase is not constant at -90 or +90degree across frequency. The code I have is as follow b ... 23 Apr 2010 20:40