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Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

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1answer
46 views

Artec QDD2 reverse voltage problem

Good day everyone, I have an Artec QDD2 overdrive circuit and I recently powered it up with reverse voltage by accident and it doesn't give any sound on the stages of distortion, however it is ...
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2answers
74 views

Why won't my IIR filter work?

I have a cascaded IIR filter that has a sampling frequency of 1kHz and consist of a highpass filter with a cutoff frequency of 0.8Hz and a lowpass filter with a cutoff frequency of 5Hz. I have ...
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1answer
21 views

DC Free Transmission SNR

My SNR is better with DC Free transmission. Why? Example: 1.) Datasignal with DC: Datastream consisting of 0V and 1V. 2.) Datasignal without DC: Datastream consisting of -0.5V and 0.5V. The ...
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1answer
26 views

Manipulating SPL

I've performed an experiment on guitar tone - ive used a fourier analysis to find the different frequency components. The idea of this is to find the sound pressure level of the consonant intervals ...
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1answer
37 views

Is the system y[n] = x[n] + x[n-1] invertible?

Is the system y[n] = x[n] + x[n-1] invertible? If yes, what's the value of x[n]? If no, could you please introduce a counter ...
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1answer
71 views

How to determine JTAG pins? [closed]

I have an embedded device where I need to figure out if there is a JTAG connection on some of the pins. There is no obvious header but some pins which at least look promising. The problem is, it is ...
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0answers
40 views

which device to use to convert analog signal to full fledged digital signal? [closed]

Am thinking of project of digital transmission of music over laser. But the thing which isn't clear to me is, I know theory behind all this stuff like analog signal then sampling, quantization, Delta ...
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1answer
40 views

Intuition behind ambiguity of direction using linear array

I have recently started studying array signal processing. I am struggling to understand the intuition behind ambiguity of direction using a single linear array and how it is solved using two parallel ...
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3answers
52 views

The distribution of phase angle between identical zero mean Gaussian random signals?

I am trying to solve the 2013 paper set by ISRO for electrical engineers. I was hoping to get some clues on how to approach this problem - No 22. random signals which have gaussian distributions will ...
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0answers
33 views

Inverse Laplace Transform isn't A Contour Integral

I've learned about and used the Laplace transform in several signal processing classes and the inverse transform has always been defined as an integral like this: $$ \mathcal{L}^{-1}\{F(s)\} = \frac{...
1
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1answer
59 views

Maximum Allowable Noise of ADC Input Signal

I have a question about calculating the maximum allowable noise for an ADC signal conditioning stage. I have an existing signal conditioning stage as well as an ADC on a microcontroller. I would ...
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0answers
30 views

About drift in yaw angle calculated by mahony filter

I have applied mahony filter using raw data from vector nav vn100 sensor and compare Euler angles estimated by mahony with those from vector nav vn100 which are computed by kalman filter. The ...
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1answer
60 views

Confusion of terminology for control systems

I am confused about the following definitions (if there are any): Reference input reference signal setpoint reference I don't understand specifically what they are referring to. Do they refer to ...
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1answer
81 views

Fourier transform does not produce the correct result

I am trying to calculate the absolute value of a certain sinusoid to see how MATLAB calculates the Fourier Transform by using the freqz() command. Here is my Matlab code ...
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0answers
45 views

What exactly does the frequency spectrum represent?

The signals in the image represent a low pass signal and its Hilbert Transform. I know that a plot for a signal's magnitude with reference to frequencies can be found by applying a Fourier Transform. ...
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0answers
22 views

Can we do Karhunen-Loeve Transformation in one dimension matrix?

I have a one-dimensional matrix (that was extracted from the audio data) to process so the noise of the data could be eliminated. A paper told me that I have to use the Karhunen-Loeve Transformation (...
2
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2answers
121 views

Differential Equation of RC Low Pass Filter

I'm trying to analyse the following circuit to find the differential equation describing the relationship between \$V_{in}(t)\$ and \$V(t)\$: Where \$C_1 = 2uF\$, \$C_2= 1uF\$ and \$R_1=R_2=1k\Omega\$...
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2answers
106 views

How to detect a partial discharge in a noisy signal?

I am working on a competition where we are required to detect partial discharges in given signals. Each signal represents a measurement of some power-line voltage. I know that partial discharges ...
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1answer
63 views

Quadrature Encoder Interface Circuit

This is an interface circuit of Quadrature Encoder (A, A', B, B') with MCU. I cannot make sense of the working of OpAmps in this circuit. Is it some standard circuit for doing signal conditioning or ...
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1answer
58 views

Desktop PSU registering signal from 220ac input [closed]

Question: Do "current+old" generation desktop pc's have any built-in means of registering a signal that is modulated on a (220v) AC power output? Application/context: Suppose your energy company ...
2
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1answer
50 views

How to use my bits to transmit this photodiode signal in the most efficient way possible? [closed]

Suppose I have photodiode with a Dark Current of 5 pA and that using the NEP of that photodiode at some frequency \$\lambda\$ I determined that the smallest signal I could detect was of 1 pA. First ...
3
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3answers
411 views

Difference between analog signal and battery voltage

I want to find out if using an analogue sensor is feasible in my noisy environment by running some signal integrity tests before I buy it. Because I don`t have the sensor yet, I need to simulate its ...
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0answers
25 views

Can you please explain me what is the meaning for the range of an ADC?

I am reading about ADC and I saw this: Adjustable full-scale ranges from 12pC to 350pC and adjustable integration times from 50µs to 1s allow currents from fAs to µAs to be measured with ...
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1answer
75 views

How do I convert 1/3 to signed float 8 bit?

The formula is as follows: (-1)^[signed bit] * (1.[significant bit]) * (2^[excess bit -3]) or (-1)^[s] * (1.[f]) * (2^[x-3]) It is a question posed by my signals and systems instructor, hence the ...
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3answers
65 views

Tektronix function generator THD

I am confused by the datasheet of the AFG3021C: https://www.tek.com/link-click-count?nid=75006&url=https%3A//download.tek.com/datasheet/AFG3000C-Arbitrary-Function-Generator-Datasheet-75W282817....
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0answers
63 views

Signal conditioning for piezo shock-sensor digital input

I have a piezo element glued to a piece of material, and I want to get a digital signal (to drive an interrupt on an Arduino) when something strikes the material. So, there's a certain noise floor on ...
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1answer
42 views

How do you reduce this simple system diagram for the sake of doing algebraic manipulation?

My guess is that since H(s) is parallel with 1(s) we'd do A(H - 1)? But this is my first ...
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2answers
179 views

Can I convert a mini guitar-amp into a portable auxiliary speaker?

Being a guitar player, my brother got me one of those guitar shirts for Christmas that has a board with pressure sensors attached to it and an actual miniature amplifier. When the sensors on the board ...
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0answers
33 views

trigger a circuit using one time signal

I'm really new to electronics and I need help. Say I have Line A. I need to control Line A to set it as HIGH or LOW using a one time signal through one input line X or maximum through two lines X and ...
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0answers
34 views

Finding the memory polynomial model coefficients

I want to build a memory polynomial model given that I know the corresponding output signals for known input signals. What is the easiest way to find the coefficients of it? And how do we take the ...
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0answers
40 views

How do I calculate a PID controller gain for a certain damping coefficient?

I have a third order process and I have to design a PID controller by cancelling out the two most dominant poles of the process. The process transfer function is: The controller is of the form, where ...
21
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14answers
2k views

How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other?

An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following: While linearity is a truly astonishing property of nature, it is by no means a rare one. ...
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1answer
49 views

Inverse Z-transform Problem [closed]

I'm rather stuck trying to compute the inverse Z-transform y[n] of the function below. I'm having trouble selecting the correct formulas from the table to achieve the right solution. Any help with ...
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0answers
11 views

Differential Power Analysis - Sizing LC Filter for High Power (100W) Applications, Expected effect on Variance

Working on a project where I am defending against side channel attacks on consumer motherboards, specifically power analysis. By monitoring the power consumption of a motherboard in real-time, an ...
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3answers
83 views

Linear Time Invariant System Causality [closed]

If I have an LTI system defined by the recursive difference equation: $$y[n] = -\sum_{k=1}^{N} a_k y[n-k] + \sum_{k=0}^{M} b_k x[n-k]$$, why can't I say the system is causal? The output at each ...
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1answer
33 views

Determine the impulse response of the following discrete system

I'm not sure how they got the answer (provided below) for the following discrete system y[n] = x[n]- 2x[n-2]+ x[n-3]- 3x[n-4] the answer is given as .... h[n] = [1 0 -2 1 -3] why is this? any help ...
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1answer
27 views

USBL Hydrophone Array Spacing

I am trying to design a USBL acoustic pinger location system for a school project. I am struggling to determine if the frequency of the acoustic beacon ping places a constraint on the distances ...
1
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1answer
30 views

Continuous, frequency-domain digital equalizer

I'm facing a real case of DSP application. I have a basic knowledge of digital filtering and telecommunication issues. The input of my "black-box" is a digital audio signal (say a common WAV file, ...
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2answers
46 views

What is the minimum output frequency according to this datasheet?

Can this DDS output down to 0.05Hz sine? I think the resolution is 0.0291 Hz. Does that mean that is also the miimum freq. it can synthesize?
2
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1answer
192 views

Calculating the entropy rate of ADCs

Formally, the entropy of a normal distribution is:- $$ \frac{1}{2} \log(2 \pi e \sigma^2) $$ So if you're sampling a random (normally distributed) signal, that would seem to be the rate of entropy ...
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4answers
282 views

16 bit DAC microcontroller

I'm currently working on a audio project where I need to play a 16 bit depth signal with a speaker. Right now I'm using an atmega328 for prototyping, two 8 bit shift registers (controlled by the MCU) ...
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2answers
33 views

Define LTI system from a single input output pair

I am currently studying signals and systems, and am learning about LTI systems right now. I know any LTI system whose impulse response is known can be completely defined through the use of the ...
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2answers
53 views

What is signal resolution?

I'm trying to understand signal resolution, so therefore I am looking for a more clearer explanation. Primarily signal resolution is linked to an Analog-Digital converter. Quoting from new ...
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2answers
44 views

A question regarding signal analysis

I'm quite new to the topic but I know about LTI systems, convolution and Laplace transforms as a concept. I also know the meaning of transient and steady state analysis. I was reading an article on ...
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1answer
136 views

Can we use ethernet cable instead of coaxial cable without adaptors.?

I am a mechanical engineer. Trying to build a computer vision system using endoscopic camera. I have a camera with 4 pin input, 2 input pins for power supply of 5 volt and 2 input pins for video ...
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2answers
92 views

Creating a vibration device based on bass in audio [closed]

First, I'll admit that I haven't done any real electrical engineering in years so I'm quite rusty. But here's a fun project to contemplate: I'm building a device that "rumbles" with the bass in the ...
1
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2answers
89 views

Is there a circuit that can create dispersion?

I'm wondering if there's a circuit that would create dispersion effects. Essentially, I'd like to create a circuit which can do the following: Spread out a high frequency pulse. For example, put in a ...
2
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0answers
38 views

What is the signal-noise model of laser induced fluorescence?

The following image is an example of a fluorescence signal trace from the photomultiplier tube detector (PMT). Each spike represents one fluorescently labeled cell. This signal model is definitely ...
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4answers
128 views

TDMA in telephone circuit switching - isn't there delay in transmitting a particular user's speech? [closed]

Let's do a simple case on the left with X and A user telephones. So the way an analog signal (user's speech X) is handled, is that it is sampled at 8000 bits / sec. The high-speed C-channel has 128 ...
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2answers
95 views

Why are binary signals drawn continuous in time despite being a digital signal [closed]

The conventional definiton of a Digital signal is as follows: A digital signal is a signal that is discrete in time and quantized in amplitude. Almost all resources (textbooks, online sources,etc) ...