## Forums comp.dsp

## SVD vs. PCA

inI've been studying principal component analysis, and don't get it, though I know it's popular. However, it reminds me of singular value...

I've been studying principal component analysis, and don't get it, though I know it's popular. However, it reminds me of singular value decomposition, though I haven't used that in a while. Can anyone clue me as to the intuition for PCA, when it's applicable, as opposed to cases where one would use SVD? Or recommend a tutorial paper, or text book, which covers these questions? -...

## Simple SONAR Detection Question

inConsider the fundamental concept of a sonar (or radar) hich transmits a pulse and is looking for the return. Are there targets which...

Consider the fundamental concept of a sonar (or radar) hich transmits a pulse and is looking for the return. Are there targets which significantly distort the pulse shape, so that using a simple correlation (matched filter) for the detector results in degraded performance? In other words, it seems like what you REALLY want to use is a return, or received, signal correlator, not a transmi...

## Direction of arrival with Unitary Matrix Pencil Method

inHi guys, i have written the script on matlab for estimate DOA with uniform linear array, using the matrix pencil method. The estimated angles...

Hi guys, i have written the script on matlab for estimate DOA with uniform linear array, using the matrix pencil method. The estimated angles are almost right when they are up about 45°, and they are very good when they're close to 90° Can anyone help me? It's very strange, also the signal is without noise!! I post my script. you can run it changing the initial doa to estimate. Thank you very mu...

## How to get likelihood of a bearing estimation?

Hi, I am reading a paper on particle filter on bearing estimation. The system model is: x_k = P*x_k-1 + w_k P is a 4X4 matrix. x_k is...

Hi, I am reading a paper on particle filter on bearing estimation. The system model is: x_k = P*x_k-1 + w_k P is a 4X4 matrix. x_k is the position and speed of a 2-D of the object position (a, a^, b, b^). The measurement z_k is: z_k=tan^-1(b_k/a_k) + v_k w_k and v_k are Gaussian noise. On particle filter, it needs likelihood to calculate posterior probability: p(z_k|x_k...

## OT: Clockwise or anti CW

inHere is a good one, if you are left-handed do you still like a volume control (or some sort of control knob) to be CW for up and ACW for down? It...

Here is a good one, if you are left-handed do you still like a volume control (or some sort of control knob) to be CW for up and ACW for down? It just struck me after seeing some students wire pots the wrong way round that we just accept CW as forwards.

## Random walks with Random Projections

A long, long time ago I had the idea of adding in data to a recurrent random projection. You keep sending the output of the RP back to its input,...

A long, long time ago I had the idea of adding in data to a recurrent random projection. You keep sending the output of the RP back to its input, while adding in (or substituting in) some new data in one or more of the dimensions. You can see complex behavior when you do that. I used that for pattern detection and such like. I couldn't really understand what was happening though.

## Frequency offset compensation for 802.15.4 (ZigBee-MSK)

inHi all, I am working on implementation of zigbee device on FPGA. Till now I have made Tx which is compatible with commercial devices. Also I...

Hi all, I am working on implementation of zigbee device on FPGA. Till now I have made Tx which is compatible with commercial devices. Also I have Rx which is working with my own Tx, but does not work with commercial devices. Major reason why my receiver can not decode signals from commercial devices is frequency offset. So far I tried to apply zero crossing approach to decode signal, but that d...

## Using TMDX5505EZDSP Processor

inI recently bought a TMDX5505EZDSP processor and installed code composer studio for DSP algorithm implementation purpose. I do have very...

I recently bought a TMDX5505EZDSP processor and installed code composer studio for DSP algorithm implementation purpose. I do have very good experience in the Software side of Signal Processing but don't have much exposure in using the DSP Processors so go this processor. Please suggest me some resources to start with. I want to implement the common DSP algorithms in processors and then build upo...

## floating to fixed point conversion

inhello, I am working on IIR filter to implement on DSP which is fixed point , but coefficients of filter I am getting is floating point from...

hello, I am working on IIR filter to implement on DSP which is fixed point , but coefficients of filter I am getting is floating point from MATLAB say one of them is for example: 0.000000058323780584287955 Now how should I convert this to fixed point value? I dont have fixed point toolbar in MATLAB. please help me with my queries. Thank you in advance. -----------------------------------...

## how to get impulse response of a 5-poles synchronously tuned filter

inHi, I am new for DSP area, currently I have a transfer function(real function) for 5-poles synchronously tuned filter, and I can do...

Hi, I am new for DSP area, currently I have a transfer function(real function) for 5-poles synchronously tuned filter, and I can do frequency domain multiplication with the spectrum of the input signal. But I also want to do a time domain filtering with this 5-poles synchronously tuned filter and compare with the results of frequency domain multiplication. However I don't have the impulse ...