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Re: wordlenghs of CIC filter
The process of bitwidth selection is described in details in the paper:
An economical class of digital filters for decimation and interpolation
by: E. Hogenauer
I guess that the result you have is 1 bit less that you expect because you design an interpolation...
There are lot of ways to generate a sinewave in a DSP, including the CORDIC algorithm (however it is not the simplest one). You can also achieve this by using a recursive filter or a polynomial decomposition. In fact many (if not any) DSP C compilers has a function to generate the sine function...
Hi,
The Filter design toolbox in MATLAB assumes 1.15 input data format for a CIC filter by default. The CIC output wordlength is calculated automatically in MATLAB. Therefore the S36e15 that you see means that the CIC filter design function has determined that the gain of your CIC filter is...
1) What is the best estimate of the number of multiplications per second required to process this data with a standard transverse FIR filter ( Based on the harris forumale for filter length)?
I don't know what the harris formula is, but you have to design an LPF satisfying your criteria at...
Re: Sigma Delta Modulator
z=roots(b)
p=roots(a)
H=zpk(z,p,1)
[cifb_a,cifb_g,cifb_b,cifb_c] = realizeNTF(H,'CIFB')
b and a are filter numerator and denominator coefficients.
I'm not sure if there exists a strict analytical expression for the output spectrum of an SDM. In my opinion the best sources of information on the subject are:
R.Schreier, G.Temes "Understanding Delta-Sigma Data Converters", IEEE Press
"Data Converters: Theory, Design, and Simulation", Ed. by...
differentiate between ma model and ar model
Additionally
AR model performs better for the signals with sharp peaks in PSD, whereas MA modek performs better for the signals with wide lobes in PSD.
Re: need help in beamforming
Are you interested in beamforming or in DOA estimation problem in general? I attached a good presentation on the second subject.
A linear system has two properties: scaling (f(Ax)=Af(x)) and superposition (f(Ax+By)=Af(x)+Bf(y)). Try to test the second property, when x is a sinewave and y is a constant positive level offset. In a linear system you would obtain the same half-period waveform, but shifted above zero. In...
Actually, I never worked with SALP Toolbox, but I made the similar things with Signal Processing Toolbox. I guess that You will need three loops:
the first one is for the dataset length (Dim in the definition of the sg_cissoid function),
the second one is for the difference between tone...
vhdl + scripting language
I found TCL a very useful tool for automating simulation in Modelsim and ActiveHDL. It saves a lot of time since when you change source files you only have to run one script file to compile and/or synthesize and simulate a design instead of performing all these...
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