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## Simple Integration

inI have an integral 1/(a^2-x^2) wrt x. If you use partial fractions we get (1/2a) * ln [ (x+a)/(x-a) ] +c and zero initial conditions...

I have an integral 1/(a^2-x^2) wrt x. If you use partial fractions we get (1/2a) * ln [ (x+a)/(x-a) ] +c and zero initial conditions gives c=0 however, this is a standard integral and should be (1/a)arctanh(x/a) How to get to that stage. I know of course arctanh(x)=(1+x)/(1-x) when I use this the sign is wrong.

## Real Square Waves

inHi Guys. Want to see some real square waves? Check this out: https://shareably.co/dangerous-square-waves/ [-Rick Lyons-]

Hi Guys. Want to see some real square waves? Check this out: https://shareably.co/dangerous-square-waves/ [-Rick Lyons-]

## How to synchronize ADC input to reference pattern?

inHi, I have some (quite old) network analyzer software source code which creates amazingly accurate results with PC sound devices. Basically...

Hi, I have some (quite old) network analyzer software source code which creates amazingly accurate results with PC sound devices. Basically it outputs some reference to line out while sampling its own output at the right channel and the two port response at the left channel. When using (cyclic) noise patterns as reference everything is fine because any latency is cancelled by the sam...

## Matched filter chiprate issue

inHi all, I have received a transmission which consists of a series of PN sequences. I recorded at 8*10^6 SPS (8 MSPS) and wish to perform a...

Hi all, I have received a transmission which consists of a series of PN sequences. I recorded at 8*10^6 SPS (8 MSPS) and wish to perform a matched filter on it. The transmission binary sequence is 1*10^6 bits long and I have just been informed that it was transmitted at a rate of 1,016,118.24682 bits/sec which seems like a very strange chip rate to pick but unfortunately this is beyond my ...

## Doppler correction, SatCom channel.

inHi, I am looking at a Goldcode transmitted from a LEO satellite and want to perform a matched filter on it. The problem is there is a...

Hi, I am looking at a Goldcode transmitted from a LEO satellite and want to perform a matched filter on it. The problem is there is a significant amount of doppler (20kHz) which degrades the performance of the matched filter significantly. If I have a chunk of this signal (quadrature sampled) what would be a good approach to negate the affects of the doppler? Any input will be much apprec...

## Hilbert transforms and sampling rate?

Hi all, My knowledge of biquad filter coefficients isn't great but from what I've experienced, they change based on sampling rate. but I've...

Hi all, My knowledge of biquad filter coefficients isn't great but from what I've experienced, they change based on sampling rate. but I've bumped into these two examples of hilbert transforms online and neither takes sampling rate into account. Are they okay to use or are they just based on 44.1kHz? Thanks, Matt // hilbert quadrature filter hilbertBiquad(x0) { x1 = biq

## Shifting the Sinc filter in the frequency domain

inHello, The following example from dsprelated.com shows the design of Sinc filter with the following parameters. The link of the example as...

Hello, The following example from dsprelated.com shows the design of Sinc filter with the following parameters. The link of the example as below; https://www.dsprelated.com/freebooks/sasp/Example_1_Low_Pass_Filtering.html With the Matlab command fftshift the frequency response of the filter is centered at 0 frequency which is 256 the frequency bin. My question is, how can I move the c...

## wow. it starting to look like USENET is getting pretty dead.

inthis used to be a very active newsgroup. nothing happening since Oct 17 and now it's Nov 2. sorta gets eclipsed by Stack Exchange (which...

this used to be a very active newsgroup. nothing happening since Oct 17 and now it's Nov 2. sorta gets eclipsed by Stack Exchange (which allows for formatting math equations and pasting in graphics). r.i.p. comp.dsp i guess we all die sometime or 'nother. r b-j

## CIC interpolation implementation

inI sent this to Rick, but thought maybe a wider reading would be beneficial. I'm designing a CIC interpolating filter (N = 3, M = 1, R = 15 if it...

I sent this to Rick, but thought maybe a wider reading would be beneficial. I'm designing a CIC interpolating filter (N = 3, M = 1, R = 15 if it matters) and I came to a realization I hadn't had before and haven't ever heard anyone else mention. That often means there's something badly wrong with it, but I don't see it. Let's start with the traditional implementation:

## Control loop Question

inIf you have say a speed loop for a motor and an inner current loop, what spec should the inner loop have relative to the outer? I am assuming the...

If you have say a speed loop for a motor and an inner current loop, what spec should the inner loop have relative to the outer? I am assuming the inner current loop should have a much higher bandwidth otherwise it will interfere with the outer loop. Is this how it is usually done?

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