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hi all,
I have some problems in the traceback action of trellis diagram in viterbi decoding
Suppose path metrics be the sum of number of same bits between codeword and received bit
At trellis update stage,
Suppose in path 1, path metrics sum is 14. Set t = t+1, it becomes 17 (3 bits are the...
In Knowles [2,1,1,1] adder, Gi:0 is generated from Gi:k and Gk:0 rather than the normal way from Gi:k and Gk-1:0. However, I was asked to prove if it can generate a correct output but was stick at a point.
Here's what I have done
I assume Pk:k = Ak(+)Bk and Gk:k = AkBk
Then, assume the adder...
Verilog problem
I am writing a verilog program and some problems were encountered. I just write another small program to try and the same error happens. I would like to know why.
Here's my program.
module abc(input clk, input start, input middle, output [3:0] endkj);
reg [1:0] state...
Thanks mcs51mc.
So, if my state machine has included the return path, it will be correct as one of my friends claim that not so state machines should be included but he did not tell me the reasons behind.
Thanks in advance. :-)
Re: Fourier Transform
Assume u(t) = 1 when t > 0.
Then, step function can be considered as u(t) = ½ + ½*sgn(t)
Let F denotes Fourier transform.
F(1/2) = π*δ(ω)
F(sgn(t)) = 2/jω (It can be derived from F(1/t) = k*sgn(ω), where k is a constant I forgot..
So, F(u(t)) = F(½ + ½*sgn(t)) = π*δ(ω)...
I have some confusions about state machine.
Let take an example.
Suppose I have a very calculator in which I can enter a menu to select functions. I can select calculation modes from modes A to E from menu. If I have to select mode A, I have to press the bottom MENU for once, and for mode E, I...
Suppose an image was filtered by Sobel filter, where Sobel filter is [-1 -2 -1; 0 0 0; 1 2 1].
Can I use the Wiener filter to restore the original image, or only the boundary of the object in the image can be recovered?
Thanks. :-)
Hi, everyone. When I did a question on Wiener filter, I do not know how to deal with it.
The question is as follows.
_____________________________
It is known that a certain object g(x,y) of size 256X256 is filtered by h(x,y) and then is corrupted by white additive Gaussian noise n(x,y) to...
Material dispersion in optical fiber is defined as D = (-λ/c)×(d²n/dλ²)
I was given a graph of λ²×(d²n/dλ²) against λ, refractive index of core of fiber, index difference and diameter of the core and cladding.
What I would like to ask is the stuff I have to find out is (-λ/c)×(d²n/dλ²) =...
significance of convolution
The physical meaning of convolution is the multiplication of two signal functions.
The convolution of two signals helps to delay, attenuate and accentuate signals.
One of my friends are designing the microphone interface, but he is stuck at some problems. I hope you all can help him.
The problem is
(1) the microphone can only detect signal only with zero or very very short distance
(2) can't amplify the signal under my control with the use of...
I am using a simple op-amp to make an inverter. I set Rin = Rout.
However, when I implement it and feed a 1 MHz sine wave into the input, the output was unexpected. It seems to have distorted plus something I don't know. I don't know why.
When I use JK-Flip flip to serve as a frequency divider...
Based on my fundamental chemistry knowledge, I think there is no exception.
Let take 2 examples.
Addition polymerization
The polymerization from ethene to polyethene has changed the double bond in ethene into single bond. So, there is chemical change.
Condensation polymerization...
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