Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

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2answers
51 views

How do you split a summing point into two?

I am solving a control system example on block reduction rules and stuck on this particular step. According to me, I can move the summing point ahead of the middle block to get G4 multiplied to both ...
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3answers
38 views

Why do we use a wide-band amplification in order to reproduce a sharp pulse without distortion?

I was reading some content with regards to the Fourier Transform and the uncertainty principle. In the book I was reading that Due to the uncertainty principle, in electronics we use a wide-band ...
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2answers
78 views

What is the practical probability of a bit getting flipped during transmission?

We know that Coding Theory depends on the fact that the probability p of a bit flip must be less than 0.5. From Fundamentals of ...
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0answers
51 views

find the amplitude and phase of the signal

How to write a code to compare the amplitude and phase of these three signal through Arduino?
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1answer
80 views

How to count these spikes?

This signal is from an instrumentation amplifier, read from Arduino MEGA2560 ADC, loop delay 10ms (rate 100Hz) I need to count high spikes only, (in below figure, 6 high spikes can be observed) Edited ...
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0answers
40 views

How does stretch processing work for SFCW?

I've been reading about FMCW radar, and I understand that a chirped signal can be de-chirped by mixing it with a copy of itself, which yields a beat frequency which is much easier to process and is ...
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1answer
55 views

confusion understanding a processor?

As shown highlighted in attached photo,In case of 6713 dsp,during each clock cycle, up to eight instructions can be carried out in parallel Does this happen in case of every processor that multiple ...
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6answers
2k views

Lossless compression technique for digital signals in an embedded system

Here's the scenario: I have an embedded system where an ADC logs a 16-bit potentiostat sample every 2 seconds. The system continues to record data for weeks, making memory usage a concern. Instead of ...
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0answers
21 views

ADC negative input clipping vs scaling and bias

So, I have this differential ADC (AD7641) and plan to use AD8139 as his driver. The goal is to digitize a signal (a sine wave) of about 3.5Vpp and 36KHz. The signal is actually single-ended and ...
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5answers
85 views

In-Circuit Crystal Frequency Measurement

I am designing a small testing unit to automate production testing for my company's main boards. One of the tests to be done is to verify that an 8MHz external crystal oscillator for a PIC MCU is ...
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1answer
72 views

Automation - Stealing a signal from a circuit

I am a software designer (for reference). I struggle with electronics and signals. I have a device that has a microswitch that completes a circuit with a PCB. I would like a way for that microswitch ...
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2answers
142 views

Series RLC circuits

Suppose a series RLC circuit has its resonance frequency f_r. If we apply AC current of frequency f_r to this series RLC circuit then circuit has maximum current as output. My question is little bit ...
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2answers
72 views

SSB and Hilbert transform

I have came across a question where it asks if the input to SSB (LSB) modulator is mh(t) (which is the hilbert transform of m(t)), will the of the modulator be LSB? What I did : I did the math and ...
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1answer
52 views

Advice needed for a final year project on wheelchair automation and control

My project partners and I have been trying to design a wheelchair for people with neuro-degenerative diseases. I know this has been done in the past, however we are using a different approach. We are ...
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3answers
218 views

Are there ICs that allow extracting a selected frequency component from a signal? [closed]

In many applications, what you need is just extracting one frequency from a signal (that is, to know its amplitude). I was dreaming about an IC that allows selecting a frequency of interest, perhaps ...
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1answer
85 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
36 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
65 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
60 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
26 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
26 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
66 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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3answers
87 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
42 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
67 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
141 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
30 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
91 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
450 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
57 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
33 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
78 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
88 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
128 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
31 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
45 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
83 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
26 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
36 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
39 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
58 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
28 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
45 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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