# Tag Info

## Hot answers tagged matlab

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### Why doesnt DFT Padding cause sinc like features

The OP is showing very good insight in all the comments stated. A product in the time domain with a rectangular pulse is convolution in the frequency domain with a Sinc. In fact zero padding in time ...
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### Why doesnt DFT Padding cause sinc like features

@George kirby. I suggest you discard that notion of "multiplying a step function on top of the original signal to form a longer time sequence". I believe such a multiplication is not ...
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### Why doesnt DFT Padding cause sinc like features

lots of good stuff in the above answer. But you can absolutely see the sinc function in the frequency domain - just pick a sin wave that's got a period that evenly divides the new signal length. For ...
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1 vote
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### Trying to replicate results from tfestimate function in Matlab

I can confirm the following algorithm successfully replicates the tfestimate function for my signals $x(n)$ and $y(n)$, Algorithm Divide $x(k)$ and $y(k)$, where $k=0,1,\ldots,N-1$, into data ...
1 vote
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You are sampling, then resampling, then (essentially) filtering. Everything that you see can be explained because of the combination of these effects. You're starting with a signal at 100Hz: $x(t) = \... • 12.7k 1 vote ### Calculating stopband cut-off frequency and stopband attenuation for FIR lowpass window filter Some helpful advice: The order of 5 for an FIR filter is very small. I assume from the OP's comment that the exercise will be to compare FIR and IIR filters for very small order. Plotting the spectrum ... • 51.4k 1 vote ### Spreading sequence for dsss or cdma Why is this type of sequence never used? Complex spreading sequences are used all over the place: OFDMA is a special case of CDMA, for example. • 30.7k 1 vote Accepted ### How to select the location of submatrices to have specific property in the output of multiplication Your condition is$W_{2,2} W_{2,2}^T = IT = W_{2,2}^{-1} W_{2,1}$If$T$has non-zero elements only in the first collumn it means that$T = \begin{bmatrix} \textbf C & \textbf 0_{P \times (P-r)}...
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