# All Questions

15 views

### What does it take to design a 4th order band-pass filter with -24dB/Octave?

I would like to implement in software the same isolators that the Pioneer EFX-500 features: The manual says the following about the isolators: High-performance 3-band Isolator Function [Fourth-order ...
11 views

### How to find the probability of Kalman filter states? [OpenCV+Python]

I am working on a video object tracking problem. I am using Kalman filter to predict and correct the object position return by an algorithm such as CamShift. I want to adjust the likelihood ...
19 views

### How range of the signal increases when modulation is done?

I am very confused because we know by increasing frequency we decrease the wavelength hence the distance covered will be very less but when we modulate a signal we are basically increasing the signal ...
9 views

### coupling a 56K modem in V32 mode over a full duplex HF radio link

While it seems more a HAM Radio project, I think i may find some hints here over the feasibility of the project. Suppose that i have two transceivers operating over two HF frequencies, a phone line ...
138 views

### Can the instantaneous frequency be always derived from an analytic signal?

Instantaneous frequency can be defined as a derivative of an instantaneous phase of an analytic signal which can be nicely seen in practice in this example from Scipy's documentation. But it seems ...
10 views

### BCJR equalizer modification to begin and end at non zero state

I use the "decode_bcjr" function as my ISI channel equalizer in the following code: https://github.com/susalib/susa/blob/master/inc/susa/channel.h This assumes the channel output begins and ends at ...
21 views

### Hilbert transform “pass band”

I sample a human speech at 24kHz, to make the Hilbert transform using FFT and iFFT. What are the minimum and maximum frequencies (or range of frequencies), which will be 90 degrees shifted? Maximum ...
20 views

...
20 views

### Computation of the Inverse DCT (IDCT) Using DCT Or IFFT

Is there a way to compute the inverse discrete cosine transform (type-2) by leveraging either a DCT, FFT, or IFFT algorithm? I have seen ways to compute the DCT using FFTs, and I've seen ways to ...
32 views

### Signal bandwidth of an 802.15.4 signal at 2.4 GHz

This signal uses Offset QPSK with a half sine pulse shaping filter for the purpose of getting a constant signal envelop. Does anyone know the exact bandwidth of this signal after being pulse shaped, ...
23 views

### Synchronization , channel estimation, frequency error correction challenges in a digital receiver

A digital receiver is supposed to do carrier phase synchronization, symbol timing synchronization, channel estimation for the purpose of equalization and also correct for any residual frequency error ....
13 views

### Half wave rectified difference in python

I'm trying to calculate a half-wave rectified difference between two audio files using librosa and then convert this output back to an audio file. I'm having difficulty figuring it out. In particular, ...
28 views

### Bandlimiting and OFDM spectrum - what is considered “bandlimited”?

I have been reading about OFDM modulation, it's not clear to me how you can have band-limited OFDM but given its prevalence in wireless communication there must be some designation of approximately ...
21 views

### Help designing a fast linear operator of {-1,+1} entries with low condition number *and* low hamming distance between consecutive rows

I need to design a matrix for compressive imaging where each row represents an N-pixel filter in a focal plane through which light is masked, summed, and measured (think Rice's "single-pixel camera"). ...
25 views

26 views

### Where to learn about “analog prototype filters”?

Where to learn about "analog prototype filters"? I've heard about them, but I'm unsure about what they really are and how they're constructed.
31 views

### Extracting positive frequencies of discrete-time signal

Convolution in the time domain is the same as multiplication in the frequency domain. My data is sampled at 200 Hz, which means that the Nyquist frequency is 100 Hz, and all frequency content is <=...
39 views

### Equalizers with low data rate systems

In case of using equalizers with ZigBee systems, what type of fading does the channel show, flat or frequency selective, fast or slow? Is the inter-symbol interference (ISI) problem encountered in ...
9 views

### How to align two images with OpenCV and python?

I have below reference image and defective image to align to find the errors of the defective image using subtraction. How can I align defective image with reference image?
12 views

### motion compensation for range migration algorithm

Is there a simple to follow explanation of how to do second order motion compensation for range migration algorithm? The one described in Carrara et al is for the ideal case. For the Extended Omega K ...
16 views

### Detect gradual increase then decrease in slightly noisy data

I have data thats not too noisy and I am trying to detect a pattern where it gradually increases then decreases in a short period of time (20 ticks? it should be roughly similar per session but can ...
15 views

### Compare images of road marker

I just want to check my approaches to the problem and see if they are really correct or whether there can be a better way Problem: I have a scene of road marker (they are predominately lane lines, ...
32 views

### How to measure acoustic pressure level under water with a hydrophone?

this is my first post here and I am also new in signal processing. Let's say I have a hydrophone with amplifier which is connected to a sound card plugged in to a computer. I gather the sounds to a ...
43 views

### Level Correction For Digital Down-Convertion?

I am trying to understand a subtle (sorry if this is obvious) difference in the computed output power after a DDC process. Here is the story: Suppose I generated a 10 MHz signal from a microwave ...
38 views

### Is this a FIR algorithm?

I'm kind of out of my element here trying to understand this algorithm and I wanted to see if this is a FIR algorithm or not? If this isn't the right place to ask this, can someone point me to a place?...
31 views

23 views

### How can I account for the 180 degree ambiguity in radio Direction of Arrival?

I'm working on a phase interferometry direction of arrival system for radio signals. It somewhat works for a range of 180 degrees (still very jumpy / imprecise), but due to only sampling at 2.4 ...
11 views

### emgucv how to detect a full object and it's components?

I want to detect sperms in a photo and I could only detect the head by using threshold then gave them a color and detect that color the problem is how to detect the full sperm and get the size of ...
53 views

### How can I determine the order of filter?

This is my first study about signal analysing. I'm very confused about filter order. My problem is how can I know whether its 12-th order, or 2nd order like the book says so? I already knew that slope ...
10 views

### What is the size of Kernel I should Keep when using Sobel filters for finding Vertical Gradient of Image?

I've trying to find the vertical gradient of OCT images of retina and extracting top 3% of images to create an image containing my point of interest ...
14 views

### how to plot data from Vector Network Analyzer using Matlab? [on hold]

Please help: I have a VNA HP8735D 30KHz-6GHz. I am working on my project to measure the spectrum of the signal. I succeeded. I am trying to do a report with a plot which I have seen on the VNA using ...
48 views

### Detect valleys of a signal

I have raw values that are coming directly from a sensor (on the fly). I do a quick calculation on these values and I end up with a graph like the bellow image. I would like to be able to detect ...
21 views

### Trying to prove BIBO stability implies the boundedness of the impulse response of an LTI system without a counterexample

I have tried to prove that BIBO stability implies that the impulse response of the LTI system, can someone please check if the proof is correct?
37 views

### How can I evaluate the complexity of two solutions when both additions and multiplications are present?

I am evaluating FFTs algorithms radix-2/4 and split radix. (although this talk can be applied to any algorithm). Each of them has a certain amount of complex additions and multiplications. That can ...
11 views

### open source to detect/compare a 2 tone pager audio signal

I'd like to develop a project that would detect the audio, compare that to a known pager tone and then an event action during a true detection. Is there any C++ open source code for signal ...