## [OT] I'm Available for Work

Started by in comp.dsp4 hours ago 54 replies

If anyone feels this is an unacceptable misuse of one of these groups -- speak up, I'll take it into account next time. I'm down to just one...

If anyone feels this is an unacceptable misuse of one of these groups -- speak up, I'll take it into account next time. I'm down to just one customer, with a couple of possibilities in the future but nothing certain. I vastly prefer to have two or three at a time, to fill my time in the natural pauses that happen in any project, and to keep a variety of work in front of me. So if you'...

## Nyquist and Shannon

Started by in comp.dsp6 hours ago 3 replies

Probly been asked many times, but - Why is the sampling theorem called Shannon-Nyquist? Nyquist published his paper in 1924, what was...

Probly been asked many times, but - Why is the sampling theorem called Shannon-Nyquist? Nyquist published his paper in 1924, what was Shannon's contribution? Where was the original's deficiency? -- Rich

## Hanning window - I/Q signal

Started by in comp.dsp19 hours ago 1 reply

Hi everybody, I have implemented Hann windowing function as follows: var N = samples.Length / 2; for (int i = 0; i < samples.Length;...

Hi everybody, I have implemented Hann windowing function as follows: var N = samples.Length / 2; for (int i = 0; i < samples.Length; i++) { samples[i] *= 0.5 - 0.5 * Math.Cos((2 * Math.PI * i) / (N - 1)); } Samples field consists of varying real and imaginary values. When i apply Hann window my signal mirrors every time at negative frequency, ergo the peak shoul

## OT more than one Matrix

Started by in comp.dsp1 day ago 1 reply

I have always said two Matrices. I heard somebody say two Matrixes which I thought must be wrong

I have always said two Matrices. I heard somebody say two Matrixes which I thought must be wrong

## cic interpolator filter in floating point vs fixed-point

Started by in comp.dsp2 days ago 1 reply

would like to share one thing i learned in a hardway about CIC interpolator. many of us do matlab model before trying any fixed-point coding....

would like to share one thing i learned in a hardway about CIC interpolator. many of us do matlab model before trying any fixed-point coding. incidentally, i had no fixed-point tool set with my matlab. this forced me to write a plain (floating point) code for my CIC integrator an comb. implementing this was straight forward. i also implemented fixed-point code in C. interesting observation w...

## Oversampled dft filter banks

Started by in comp.dsp2 days ago

Hi guys, i need help from you. I've an ADC with 16 outputs lines, so i have 16 samples in parallel each time. Example: S16 S0 S17 S1 S18...

Hi guys, i need help from you. I've an ADC with 16 outputs lines, so i have 16 samples in parallel each time. Example: S16 S0 S17 S1 S18 S2 ... ... S31 S15 Each line has 300 MHz of sampling rate, therefore its bandwidth is 150 MHz. Now i would obtain 32 channels from these 16 but at same frequency..so i would have 32 channels with 75 MHz of bandwidth. Is possible for you? Have i alia...

## Channel Estimation in the frequency domain

Started by in comp.dsp2 days ago 4 replies

Hello, I am using the ifft for the typical channel estimation in the frequency domain, in this case using 64 carriers: ChannelEst= ifft(...

Hello, I am using the ifft for the typical channel estimation in the frequency domain, in this case using 64 carriers: ChannelEst= ifft( Y./X , 64); Y is the FFT of RX signal X is the FFT of TX signal When all the 64 FFT points are filled, the channel estimation is perfect. But if i only TX some carriers: [12:50] and the rest of carriers are zero, then the estimation channel ha...

## Signal multiplication with complex number

Started by in comp.dsp3 days ago 13 replies

Hello, I would like to know the implication of multiplying a discrete sinusoidal signal with a complex number. A simple example in Matlab would...

Hello, I would like to know the implication of multiplying a discrete sinusoidal signal with a complex number. A simple example in Matlab would be very helpful. Thanks --------------------------------------- Posted through http://www.DSPRelated.com

## Filter FM and sideband overload

Started by in comp.dsp4 days ago 40 replies

Hi, I'm coding a synthesizer for musical purposes. DSP is not my major, so I'm hitting a kind of road block here. I'm modulating a filter...

Hi, I'm coding a synthesizer for musical purposes. DSP is not my major, so I'm hitting a kind of road block here. I'm modulating a filter cutoff at audio rate, (audio input signal is a saw tooth and the modulator is a sine wave). At high resonance, the modulation seams to produce side-bands around the frequency of the modulator. If I sweep the filter cutoff manually and approach those side b...

## Complex IIR Filter Toolbox

Started by in comp.dsp5 days ago 2 replies

Quite a few years ago (2004), I developed a Matlab toolbox for designing complex IIR filters. Recently, I had reason to revisit this toolbox,...

Quite a few years ago (2004), I developed a Matlab toolbox for designing complex IIR filters. Recently, I had reason to revisit this toolbox, verified it still works, and made a couple of updates so it was compatible with more recent versions of Matlab (Copyright 1984-2016 Mathworks Inc.) (and fixed a bug when fixed poles are adjacent). Surprisingly (to me), it appears to me that th