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1000 Threads found on edaboard.com: **Cos Cos Theta**

Hi Andreas,
you should specify the following points, that impact the type of approximation and the resulting complexity:
a) which is the range of x over which you want the approximation
b) what are the allowed errors and what type of specification do they have (i.e.: maximum absolute errors, maximum relative errors)
c) what resources are allowed (

Mathematics and Physics :: 01-14-2012 12:19 :: zorro :: Replies: **6** :: Views: **822**

can anyone give a result for this integration
∫**cos**(sin(θ)) dθ
unlimited or limited by any values may reduce any complexity
Roshdy

Mathematics and Physics :: 12-20-2005 15:37 :: Roshdy :: Replies: **7** :: Views: **18474**

FFT for x(t)=**cos**(2 pi f0 t) is simply a delta function at frequency of f0, with a certain amplitude (isnt this amplitude should equal 1/2?)
Does that mean FFT for y(t)=**cos**(2 pi 2f0 t) is a delta function at frequency of 2f0, with the amplitude half of the previous one? (Based on the rule of f(a)=>F(f/a)/a.
Based on (...)

RF, Microwave, Antennas and Optics :: 10-09-2009 15:41 :: sonaiko :: Replies: **1** :: Views: **1547**

because the when demdulator, for example the syn demodulator, the phase noise shall turn to the Amplitude, this is called the PM/AM of the demodulator, y can from the formuation **cos**(wt+**theta**)***cos**(wt+phase_noise) to see this effect

RF, Microwave, Antennas and Optics :: 11-16-2007 23:36 :: springf2000 :: Replies: **5** :: Views: **1018**

Iv 2 equation to convert to get then working in c. I believe that i failed this step so il asking for help.
**cos**(180-**theta**) = -(sin(lat)***cos**(Phi)-sin(declin))/(**cos**(lat)*sin(Phi));
Need function to have only 1 variable at 1 side of equation. Example: (...)

Mathematics and Physics :: 04-04-2009 13:36 :: JoKKeR :: Replies: **3** :: Views: **3077**

Hello everyone,
I would like to know if there's a software/matlab code I could use in order to convert the pattern of an antenna element to a formula that can be plotted in Matlab. For example :
% element pattern of dipole antenna
g(**theta**) = (...)

Electromagnetic Design and Simulation :: 03-07-2010 11:03 :: narfcois :: Replies: **0** :: Views: **1569**

Hello,
I am having a major issue with the far field excitation source file formatting. I cannot seem to generate a simple **cos**^q(**theta**) pattern file and need to get support from CST for this to see if they can supply someone with a **cos**^q(**theta**) pattern file. So, does anyone have (...)

Electromagnetic Design and Simulation :: 03-26-2010 17:02 :: hookups1534 :: Replies: **0** :: Views: **817**

Hello,
I am simulating a reflectarray antenna in CST. I am feeding the reflectarray with a **cos**^q(**theta**) model feed pattern far field source using the I-solver. Problem is when i get the results for the far field, i get an error at the end of the solver run that says the radiated power is greater than the excitation power (accepted power), (...)

Electromagnetic Design and Simulation :: 03-31-2010 21:46 :: hookups1534 :: Replies: **2** :: Views: **1776**

I using Raymond Thai's Thesis to do Image orientation but some how i m not getting the desired output.
Can someone tell me if there is an error in the following code
I=double(N); %loading the normalised image
dx = blockproc(I,,@sample2); %sobel x-gradient
dy = blockproc(I,,@sample3); %sobel y-gradient
imview(I,);
imview(

Digital Signal Processing :: 02-01-2012 10:54 :: Nikhilpanicker :: Replies: **0** :: Views: **386**

This is a question in the book to solve Heat Problem
\frac{\partial \;u}{\partial\; t}=\frac{\partial^2 u}{\partial\; r^2}+\frac{1}{r}\frac{\partial\; u}{\partial\;r}+\frac{1}{r^2}\frac{\partial^2 u}{\partial \**theta**^2}
With 0theta<2\pi, t>0. And u(1,\**theta**,t)=\sin(3\**theta**),\;u(r,\**theta**,0)=0 (...)

Mathematics and Physics :: 11-30-2013 17:10 :: Alan0354 :: Replies: **0** :: Views: **351**

Hello! I used formulas for calculating AF (antenna factor), and after some trial and error get results that match measurements very well. For example, side beams angular position. To calculate approximate radiation pattern i must multiply AF by element pattern. I am unsure how this thing called. When element pattern can cancel out AF side beams, or

RF, Microwave, Antennas and Optics :: 06-16-2014 22:40 :: Terminator3 :: Replies: **0** :: Views: **254**

Sorry I do not have a paper reference. For me it is simple to straight develop circuits from written specs.
Proposed circuit:
1. Use the square priniple of MOS
2. Because you use a bipolar (**cos**,sin) as input you need to bias two MOS for each **cos** or sin. The bias should be near subthreshold and the device should be (...)

Analog Circuit Design :: 11-17-2006 17:23 :: rfsystem :: Replies: **3** :: Views: **706**

hi,
how to write a program forcalculating **cos** angle(**cos** **theta**) in 8051
assembly language
thank you

Miscellaneous Engineering :: 04-03-2008 07:08 :: achuthkumar :: Replies: **0** :: Views: **710**

In reflector antenna, usually we use horn as the feed. It has been checked that the radiation patterns of the horn can be simulated as a function: \**cos**^q (\**theta**) .
The power q has been chosen at each frequency to fit the horn patterns.
I already have the radiation gain pattern of one horn, I am wondering how to approx i

RF, Microwave, Antennas and Optics :: 10-19-2011 16:59 :: panou :: Replies: **0** :: Views: **823**

Dear all
I need the result of this formula
∑(p-i)**cos**(iθ) ,
p is a constant, i is the index run from 1 to (p-1)

Mathematics and Physics :: 05-16-2006 19:07 :: Roshdy :: Replies: **2** :: Views: **580**

Are you using design compiler? If so check out...
If you're not using design compiler.
You can use a look up table. This is the ea

PLD, SPLD, GAL, CPLD, FPGA Design :: 02-18-2010 10:54 :: RBB :: Replies: **10** :: Views: **4903**

why do you want to generate a lookuptable for sine and **cos** function.
because sine and **cos**ine are the same functions with only a phaseshift of 90° you need only one LUT for both. -> sin(x) = **cos**(x+pi/2)
Next sin (x) = - sin(X+pi) means you only need to store positive values of the (...)

Professional Hardware and Electronics Design :: 07-03-2003 13:11 :: Aoxomox :: Replies: **6** :: Views: **6268**

Suggestions about building a digital sin/**cos** interpolator?
Sinusoidal input from a sensor must be splitted by a factor N > 20; the output of interpolator must provide N pulses per sinus period.
Can be built in a PIC18 or DSP?

Professional Hardware and Electronics Design :: 04-08-2004 03:45 :: xirix :: Replies: **0** :: Views: **1376**

Hi all, I have a question about something that I've never completely understood.
It is about reactive power:
When it is said that **cos**(phi) is, say, 0.7 (I just pick it from the air).
Does it mean that the motor requires this phasedifference and doesn't work well if it doesn't get it, or does it mean that it pulls the phase between S and P to

Robotics and Automatics Forum :: 08-12-2004 04:45 :: StoppTidigare :: Replies: **6** :: Views: **4579**

how do i solve this integral?
1/(a+sin (t) +**cos** (t))

Mathematics and Physics :: 11-23-2004 15:20 :: diegoisra :: Replies: **2** :: Views: **1320**

you can do it geometrically using two right triangles one of angle A and the other of angle B side by side and computing the sin(A +B ) od new TRIANGLE in terms of sine and **cos**ines of A an B angles
You can also find it with a VECTOR approach and a ROTATION and find the MATRIX of such rotation it comes from the fact that ROTATIONS are linear m

Mathematics and Physics :: 09-22-2005 19:24 :: eltonjohn :: Replies: **9** :: Views: **6879**

Hi,
is it possible to get the discrete-time signal \**cos**(n) from the continuous-time signal \**cos**(t)?
thnx
purna!

Digital Signal Processing :: 02-24-2006 13:17 :: purnapragna :: Replies: **3** :: Views: **771**

Hi
for u**cos** you can download its manual from micrium
or
ports to MIPS or ARM
Salam
Hossam

Embedded Systems and Real-Time OS :: 04-19-2006 06:48 :: alzomor :: Replies: **3** :: Views: **2160**

2**cos**(x)=e^jx +e^-jx
2jSin(x)=e^jx -e^-jx
∫ **cos** x dx = 1/2 ∫ e^jx dx +1/2 ∫ e^-jx dx = =1/2j e^jx - 1/2j e^-jx + C = Sin(x) + C
Added after 1 hours 52 minutes:
∫ **cos** x dx = Sin(x) + C
d/dx (Sin(x) + C) = ?
d/dx Sin(x) = lim dx-->0 (1/dx) (Sin(x+dx) - (...)

Mathematics and Physics :: 11-26-2006 12:40 :: bunalmis :: Replies: **3** :: Views: **749**

I measure R,S,T phase **cos** phi on three phase systems .
How can calculate avereging **cos** phi?.I need one **cos** phi value.But this value must be vectorial averege....
Regards...

Microcontrollers :: 12-13-2006 15:53 :: fuzzy :: Replies: **0** :: Views: **752**

I measure R,S,T phase **cos** phi on three phase systems .
How can calculate avereging **cos** phi?.I need one **cos** phi value.But this value must be vectorial averege....
Regards...

Professional Hardware and Electronics Design :: 12-14-2006 13:12 :: fuzzy :: Replies: **0** :: Views: **1529**

Black Jack's code is an oscillator. It's not a sin(θ) or **cos**(θ) math function.

PLD, SPLD, GAL, CPLD, FPGA Design :: 12-26-2006 06:23 :: echo47 :: Replies: **10** :: Views: **12842**

The most straightforward way is to make use of Euler's Formula. See Euler's formula - Wikipedia, the free encyclopedia
Basically, we can decompose a **cos** into a sum of complex exponentials:
\**cos**(w) = \frac{e^{iw}+ e^{-iw}}{2}
So just plug in "x + iy" for "w" and find the real an

Mathematics and Physics :: 02-16-2007 15:24 :: jayc :: Replies: **2** :: Views: **698**

Hi...
As we know Fresnel **cos** integral is ∫**cos**(?πx?)dx
Fresnel Sin integral is ∫sin(?πx?)dx
The integral boundaries are zero to x . (0-x)
I want to establish these to matlab and Plot(C,S).
I know that matlab already known C and S...However I want to reestablish by this way.Later (...)

Software Problems, Hints and Reviews :: 04-25-2007 17:04 :: jalalak :: Replies: **1** :: Views: **2841**

Hi mujee, try replacing **cos**^2(phi) with **cos**(phi)^2

Digital communication :: 05-10-2007 05:59 :: echo47 :: Replies: **8** :: Views: **3065**

{d/dx(xy)}=(dy/dx)
???????????
d/dx(xy)=y+xdy/dx
----------------------------------
x = ln {**cos**(xy)}
or, dx/dx = (1/ **cos**(xy)). {d/dx (**cos**(xy))}
or, 1 = (1/ **cos**(xy)). (-sin(xy)). {d/dx(xy)}
or, 1 = (-tan(xy)).1.(y+x dy/dx)
-cot(xy)=y+x dy/dx (...)

Mathematics and Physics :: 09-30-2007 08:42 :: salam2000 :: Replies: **6** :: Views: **843**

hi all
can u help me to design peripheral to increase **cos** pi until 0,9?? cause at my home, **cos** pi (power energy from supplier too low 0,67)????

Analog Circuit Design :: 10-08-2007 17:40 :: joet_x :: Replies: **0** :: Views: **403**

hi all,i so weird that cst not support point sources as we could simulate large arrays(100*100),could cst have that?
also how can i make wave guide with **cos**^4 pattern in cst?,in other word could i control the feed of waveguide if i use waveguide antenna and waveguide port?
i listen to u
regards

Electromagnetic Design and Simulation :: 10-20-2007 05:00 :: abdoeng :: Replies: **3** :: Views: **857**

CORDIC algorithm is used to find sin/**cos** values in Hardware design. Often look up tables are also used.
Kr,
Avi

ASIC Design Methodologies and Tools (Digital) :: 10-24-2007 05:30 :: avimit :: Replies: **5** :: Views: **1053**

1. A wave is something that moves with time in space and this can be described with any function that satisfies f(z-vt) (shifted to the right by vt) or f(z+vt) (shifted to the left). So for example the function sin(z - vt) will propagate to the right with speed v as time t elapses. To see this plot it for some times t (choose v = 1 for example). Wh

Electromagnetic Design and Simulation :: 11-03-2007 14:54 :: Jone :: Replies: **1** :: Views: **499**

i hav **cos** signal n i want to do down sample by this matlab code is correct ...
n=1:20;
x=**cos**(2*pi*n/10);
y=zeros(1,60)
for ii=1:20;
y(3*ii)=x(ii)
end
figure;
stem(n,x)
figure
stem(y)
n1=1:20;
N=1000;
x1=**cos**(2*pi*n1/N)
imp_train=zeros(1,50)
imp_train(1)=1; (...)

Electronic Elementary Questions :: 11-27-2007 13:34 :: ednan :: Replies: **0** :: Views: **2752**

hi deepa,
try to create look up table for the sine and **cos**ine values, for example sin 85= 0.996..try to create look up table for 0996 and access it using statemachine.
Thank you

ASIC Design Methodologies and Tools (Digital) :: 04-03-2008 08:16 :: balan :: Replies: **4** :: Views: **1617**

a DPCM scheme is used for encoding/decoding the massage m(t)=2sin(t)-**cos**(2t).
write a Matlab code that wil perform this task.
your result must include a list of the values and a plot of the input and reconstructed signals over the period (0,10)sec. u may select a sampling time of 0.1 sec

Electronic Elementary Questions :: 05-16-2008 11:57 :: goodtime :: Replies: **2** :: Views: **810**

have a doubt reg checking DT periodic sequence:
x=**cos**(pi* (n)^2 / 8 )
it is periodic ofcourse, but in the solution manual its fundamental period is mentioned as 8.
but i got fundamental period=N=(2*pi/ omega )
in this case, N= (2*pi / (pi/8) ) = 16.
does anybody know about how they getting N to be 8 ????

Digital Signal Processing :: 03-28-2009 01:43 :: rramya :: Replies: **10** :: Views: **11282**

how to specify sin and **cos** terms in verilog??

PLD, SPLD, GAL, CPLD, FPGA Design :: 02-17-2010 23:38 :: alangs :: Replies: **4** :: Views: **1325**

can anyone plz tell me how to implent the look up table for sin and **cos** in verilog in detail......

PLD, SPLD, GAL, CPLD, FPGA Design :: 02-19-2010 02:54 :: alangs :: Replies: **0** :: Views: **949**

Cordic just uses add&subtract according to algorithm.. There are special angle values.. By adding&subtracting those angle values accordingly, you get sin and **cos** of angle..
Pretty easy to implement trigonometric functions by CORDIC
Good luck..

PLD, SPLD, GAL, CPLD, FPGA Design :: 02-25-2010 15:03 :: Ilgaz :: Replies: **3** :: Views: **1406**

how we can implement trigonometric functions(sin & **cos**) by CORDIC......for example i want sin50=? how i can give the input angle 50 and how i can get the output sin50.....how it can be implemented in verilog using cordic...

PLD, SPLD, GAL, CPLD, FPGA Design :: 02-26-2010 07:09 :: alangs :: Replies: **0** :: Views: **843**

As fa as I've understood your question, you can consider the fact that sin(x) is shifted 90deg with respect to **cos**(x) that means:
**cos**(x) = sin(x+90deg)
if your 32 samples are 1 period of the sinewave then they represent 360deg, from which 90deg are 32/4=8 samples
so Vbeta = Valfa
Vbeta = Valfa (...)

Digital Signal Processing :: 05-11-2010 12:31 :: albbg :: Replies: **1** :: Views: **530**

Hi to all,
I need the theoretical expressions for the far-field radiated field of following antennas:
- Ideal **cos** to nth power source.
- Rectangular and circular patch antenna.
Can anyone help me?
Thank you so much.

RF, Microwave, Antennas and Optics :: 10-08-2010 05:34 :: acrislg :: Replies: **0** :: Views: **479**

Hi, plz the following matlab code calculate the sin & **cos** of an angle using cordic algorithm.
Can you plz translate this using assembly language for Blackfin processor
ai=;
x=0.60725;
y=0;
r=pi/4;
b=r;
for k =0:14

Embedded Systems and Real-Time OS :: 12-16-2010 06:20 :: fahmi87 :: Replies: **0** :: Views: **998**

Hi,
if what you need is an oscillator, maybe your best solution is a coupled oscillator. It requires very few resources for any frequency.
Basically, it is a second-order filter with the two poles in the unit circle.
The poles may be very slightly out of the circle (use saturation arithmetic!). In that way, the aplitude is fixed for any freque

PLD, SPLD, GAL, CPLD, FPGA Design :: 12-23-2010 19:28 :: zorro :: Replies: **4** :: Views: **1243**

Hi All,
I'm new in signal processing. I'm not even sure I have given an appropriate title to my question. So, I describe my problem and hope someone will point me a direction to go.
I have a function: F(t)=a1**cos**2(wt+d1)+a2**cos**2(wt+d2)+...+an**cos**2(wt+dn[

Digital Signal Processing :: 04-30-2012 06:37 :: Andrey_L :: Replies: **4** :: Views: **297**

Hello Dears
Could you please tell me which one is better for implementation of "arc **cos**(x)" in VHDL?(Also, better for implementation on real hardware(FPGA))
1_ Using Maclaurin series ( attached fig ).
2_ Using "CORDIC" method.
79271.
Regards
Mostafa

PLD, SPLD, GAL, CPLD, FPGA Design :: 08-29-2012 03:03 :: sheikh :: Replies: **11** :: Views: **678**

\**cos**(a \sin{x}) = J_0(a) + 2 \displaystyle\sum_{k=1}^{\infty} J_k(a)\**cos**(kx)
J_k(x) is the Bessel function

Mathematics and Physics :: 02-17-2013 10:10 :: _Eduardo_ :: Replies: **3** :: Views: **815**

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