Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

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71 views

Maximum power transfer of transformer [closed]

We have this transformer: simulate this circuit – Schematic created using CircuitLab The power transfered to R1 resistor is maximized when the frequency of the signal is very big.This means ...
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0answers
34 views

Trying to match Frequency-Gain chart in paper and not succeeding

I am trying to reproduce the chart on page 3 of this paper for the transfer function: H(s) = 1/(1+jw/s0) where s0=-3x10^9 or 1/s0=3.33e-10 I have tried in a spreadsheet as the paper suggests and had ...
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2answers
57 views

What is the maximum length a MC68030 can be placed away from Commodore CDTV motherboard, without affecting timings?

I want to fit a TF536 accelerator card into Commodore CDTV case, which is a challenge from the perspective of available space. I know there is a relocator board project available, but it still doesn'...
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1answer
41 views

time axis confusion in signals and systems

I am learning signals and systems and we are given a impulse response swhich is discrete and from -5 to +5 on X axis. I do not really understand that it has a negative part as everything starts from 0 ...
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2answers
57 views

Would unstable sample rate affect spectrum after FFT?

The system samples analog input and then conduct FFT on the samples and then display the spectrum. Currently, the issue is the displayed spectrum line position is keeping shift between each scan. ...
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0answers
25 views

Filtering Options for an RTL-SDR (DSP and Analog routes)

I have several related questions regarding filtering for an RTL-SDR radio. It's readily swamped by the very, very strong AM and FM radio stations local to me. So much so that your basic passive RC ...
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1answer
24 views

Equivalent baseband communication channel

I was reading on my lecture slides (I do not put them here since they are not in English) this statement about equivalent baseband channel models: In typical wireless applications, communication ...
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1answer
64 views

Manually communicate on an USB bus

I'm using an MBED LPC1768 as a UC and I'm trying to communicate with a USB Device (a random hub) just to read the device descriptor. I'm quite a novice in electronics. I've connected + and - to UC ...
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2answers
63 views

How can thermal electrical noise be uncorrelated yet appearing at a certain frequency?

Say we look at the thermal noise spectrum of an ideal resistor. Now we know it will behave like $$ \langle U^2 \rangle = 4 \, k_B \, T \,R \,\Delta f $$ We also know that two subsequent voltages ...
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1answer
61 views

Unable to generate AM wave using opamp log antiog multiplier

I was trying to make a op amp based AM modulator. I used a log anti-log multiplier to generate the below waveform. This is the output I am getting as from this circuit What I intended to generate
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2answers
41 views

Reducing a variable DC voltage by a set amount

I have an analogue signal that's 0-4 V that I want to measure using a micro-controller that only measures up to 3.3 V. I want to reduce the analogue signal by 1 V. I've seen designs using voltage ...
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1answer
62 views

How many multiplexers is too much?

This is a general question. I have a specific task that I am working on. For this task, my solution requires around 300 multiplexers with all of them 16 inputs and 16 bits per input, and a single ...
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2answers
138 views

How to calculate Doppler Shift for multipaths from moving objects?

Let's say we have a radar where the transmitter and receiver are placed together, and form an angle theta with a target object moving with velocity ...
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0answers
28 views

Convert complex number to phase shift in simulink

I am currently modelling some dynamic phenomena, combining pure simulink blocks and simscape blocks. I have measurements (real-valued) on which I perform computations with complex-valued matrices, ...
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0answers
89 views

How to amplify the output of a digital low pass filter?

I have used the transfer function of a RC low pass filter to design a IIR Digital low pass filter. \begin{equation} H(s)= \frac{1}{sRC+1} ;First \space order \end{equation} \begin{equation} H(s)= \...
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4answers
447 views

How to pick correct filter for a given signal processing task?

I did a study on digital signal processing and I found many theories. But I don't know how to figure out which filter to use when I get a practical signal processing task. Is there a procedure for ...
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1answer
55 views

Are the Front- and Back-Porches Required to be Black for VGA?

My first question for this project was how to process a fast analog signal in the first place: Digitally-Controlled Analog Processing for VGA Video Signal? This one is about a specific detail of that ...
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2answers
30 views

Time Reversal Operation for discrete time signals

For a discrete time unit step signal 'u(n)' , if time reversal operation is performed then it becomes 'u(-n-1)'. Is it true for ANY discrete time signal 'x(n)' such that time reversal operation makes ...
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2answers
116 views

what factor (in dB) is the output SNR or signal power affected by this phase error?

In a BPSK system, if at the receiver the oscillator has a phase error of phi =40° i.e. you are multiplying the received signal with an appropriate cosine signal phase shifted by 40°. Then, after low ...
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3answers
77 views

Probability of error of a system?

Let bits 0 and 1 be equi probable. For bit 0, any value between -0.3 V and 0.3 V can be taken with equal probability. Similarly for bit 1, any value between 0 V and 1 V can be taken with equal ...
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2answers
80 views

What is the probability of a bit error occurring in modern computers?

What is the probability of a bit error occuring when reading/writing from/to the latest memory technologies (ssd, hdd, ram) in modern computers? If the same terminology is used in this context as in ...
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3answers
112 views

Signal processing vs image processing?

Although both are domains of EE, but what are differences between them? I am able to draw following conclusions from wikipedia article of dip and also from some other web reources 1) DIP(Digital ...
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0answers
30 views

simulink transform integer to pulse (seen by scope)

I have a custom M function block on simulink as follows with input (a) and output (c). correspond to input (a) output (c) maybe zero or else. I want to transform this output integer to pulse (can be ...
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1answer
24 views

In a linear time invariant system, is it possible for a SS response to exist, when we have a bounded input?

The answers provided showed that it is possible. I don't understand why. I think since it said that the input signal is bounded, it means that the modes of the signal are within the unit circle, so ...
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0answers
43 views

Interpreting Fourier transform of Images

I'm new to image processing and am learning about the Fourier transform. I've read that FT decomposes a function to its constituent frequencies. However, I'm not sure how to tell which is a low ...
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3answers
79 views

convolution vs correlation?

Apparently this question looks better for DSP SE but I am posting it here to get answer in simple words for those EE graduates who didn't studied signal processing in undergrad. Apparently as far as ...
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2answers
25 views

Truncation noise in digital circuits

I was reading a chapter of my book (I am not putting it as reference since it is not in english) about the quantization noise problem in digital filters. Specifically, it writes about a filter that ...
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2answers
32 views

“Order” of a digital filter (FIR and IIR)

I have some doubts about the meaning of order for digital filters. All I'll put here is taken from these slides. 1) Let's start from the definition of FIR filters: From this definition we see that ...
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0answers
10 views

Help with Time shifting a signal representing a distribution

I have the following problem statement which I have no idea how to approach, I have a IR depth sensor, that produces a distribution for it's depth value. So it kind of looks something like this: As ...
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2answers
38 views

Physical operations of discrete - time circuits

I have a basic doubt about discrete time circuits. A discrete - time signal is a sequence of values which are taken at specific time instants (let's call them sampling instants), as we can see from ...
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3answers
58 views

Finding the impulse response from the integral

I'm trying to solve the part (a) of the following: I know that: $$ y(t) = \int_0^1 \! \delta (t-\lambda ) \mathrm{d}\lambda $$ But I'm not sure how to proceed from that.
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1answer
57 views

Techniques for determining the peak of sine wave via ADC

From the book "Digital Protection for Power Systems" the author presents some algorithms to process a sinusoidal waveform. For example, below there's a fragment taken from the index. He also mentions ...
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2answers
27 views

Is it possible to determine coefficients of an analog Bessel filter based on order, fc and attenuation only?

In our work, we were given a data which according to documentation has been filtered via an 'analog four pole low pass Bessel filter at 2kHz with attenuation of signals above -3dB of 80dB/decade'. We ...
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1answer
43 views

How do I approximate number of calculations/operations/memory/hardware is required for a 2^18 point FFT on chip?

I am looking for FFT implementation on Chip/FPGA. I need a high-resolution FFT which is a minimum of 2^18 points. However, I need to approximate how much hardware will I require for this process. I ...
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2answers
137 views

Doubts about IIR filters definition and transfer function

I have some basic doubts about IIR digital filters. My first question is about its definition. IIR means Infinite impulse response, so my question is: is it physically possible to realize such ...
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1answer
72 views

Where the ICM20948 DMP memory is stored?

In Invensense ICM20948 motion sensor they mention The DMP in ICM-20948, therefore, has higher memory for code storage Hence, the AP/MCU must accommodate higher memory required to hold the DMP image ...
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0answers
106 views

Convert analog piezo “transition” to digital signal

I'm trying to get what amounts to a knock indication into a microcontroller input from a piezo sensor. It's looking fairly good now at the fifth iteration, and about ready to provide digital levels ...
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0answers
33 views

Differences between Adaptive Extended Kalman Filter and Extended Kalman Filter

I am developing a Simulink battery model to estimate state of health of a battery using MATLAB/Simulink. I want to use a Extended Kalman Filter for the model, but in one article I read that a Adaptive ...
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3answers
138 views

How does one get ticks of a clock from an atomic clock's microwave signal?

I understand that in an atomic clock there is a microwave signal that is locked to the frequency of the atomic rotation. However, if one wants to extract time ticks from the microwave signal (shown ...
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1answer
51 views

Digitally-Controlled Analog Processing for VGA Video Signal?

A few months ago, I replaced the dead fluorescent backlight of an LCD computer monitor with an 8-bit-per-channel RGB LED strip, and built a controller for it from an AVR microcontroller that talks to ...
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3answers
86 views

what are the applicatons of op amp in signal processing?

How op-amp can be used in signal processing applications? Can anyone explain? I know that op-amp can be used for solving linear analog mathematical problems.
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1answer
131 views

IR led extremely slow to turn completely off?

I'm working on a project where I'm simply reading the amount of light emitting from an IR led with an IR sensor. For some reason, after the IR led reaches full luminosity, it takes a minimum, whopping ...
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3answers
488 views

Is the so called kTC noise, that is inherent in an RC filter, dependent on bandwidth?

An RC filter has intrinsic noise called the kTC noise which is given by the equation $$ v_\text{noise} = \sqrt{\frac{kT}{C}}. $$ Does this equation calculate a noise density with units of volts per ...
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1answer
22 views

Time Auto-correlation function for a polar reutrn-to-zero waveform

I used matlab to calculate the time Auto-correlation function for a polar return-to-zero waveform to make sure that it has an ergodic property . I implemented the following formula as a function in ...
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1answer
89 views

I would like to regulate LED brightness with audio signal tone 1khz

I'm working on school project where I need to control LED strip brightness with audio input... The stereo signal is playing some music on left channel and LED is suppose to react to generated 1khz ...
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1answer
87 views

How to bypass a MCU if it fails? [closed]

I'm designing a system in which a MCU processes a PWM signal and outputs a slightly modified version of it. As this signal is extremely critical for the application, I'm looking for a way to output ...
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5answers
1k views

Detection of signals buried in noise

This is more of a general question to see which methods are the most common to improve the detection of a signal which is buried in noise. Currently, we are building an optical system for medical ...
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3answers
157 views

Unable to reduce noise and no proper sine wave is generated using LM358

We have planned to make 30 kHz pure sine wave using LM358, by the use of a Wien bridge oscillator, I have made a Wien bridge oscillator connection in LM358. I have calculated the frequency by using ...
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2answers
137 views

Why use convolution for pulse compression in radar instead of correlation?

I have not understood the way to process pulse compression in radar signal processing. I think it's correct to use correlation for pulse compression, but I saw many materials about pulse compression. ...
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0answers
31 views

Transmitting .mp4,.bin,.txt files with on off keying OOK (optical communication)

How do you implement OOK to transmit mp4 files etc. For instance i have LED and a video file to transmit. How do you take the video convert it to binary, send it via the LED recieve it via the ...

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