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Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

0
votes
1answer
46 views

Peak Detector with Reset

I'm trying to make a N.Peak Detector with reset functions. I've tried various modification to the classic peak detector without any success. What I'm trying to accomplish is: Detect the negative peak ...
0
votes
1answer
26 views

First-order hold interpolation in matlab

I have a sinusoidal signal x(t) sampled with period 1/fs. The result is the discrete signal x[n], where x[n]=x(t)|t=nT. Then I perform an upsampling of factor, let's say, 8 to increase the sampling ...
0
votes
1answer
24 views

How to split mono signal to sterio siginal of AD9833 Sin wave generator?

I am sorry that I am not well aware in audio amplifiers, that's why I am asking this question maybe it's my stupidity. I have an AD9833 sin wave generator, I need to connect the AD9833's output to ...
14
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4answers
1k views

Why would you put your input amplifier in front of your filtering for an ECG signal?

In this article at eetimes.com they show the signal chain for measuring an ECG. The raw signal of an ECG contains noise and offsets at least a magnitude larger than the real signal. (Some few mV ...
0
votes
1answer
28 views

Signal conditioning for 2SMPP-03 Pressure sensor

I am wanting to develop a circuit that accurately measures 15 Omron 2SMPP-03 sensors within its full range of -50KPA to 50KPA. Could someone give me a head start or refer me to some information on how ...
3
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0answers
40 views

Abstract signal and noise model for a logarithmic image sensor

A conventional grayscale image sensor pixel can be modeled as a "light bucket." Photons arrive on the sensor pixel for a fixed exposure time. The light bucket fills up with photo-electrons linearly ...
1
vote
1answer
54 views

How to calculate the 3dB point?

I understand this until the final two lines. How does he get from 27.8766 to 1149.8hz and 7224.7rad/s?
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2answers
90 views

How to measure uV voltages buried in noise?

I'm working on a project in which I am analogly processing ultra low signals. The phase, harmonics and signal shape are critical to circuit functions. The signal on the input comes from an antenna ...
6
votes
5answers
2k views

Circuit to “zoom in” on mV fluctuations of a DC signal?

I have a signal that is roughly 0.2V + noise fluctuations of order 0.1-2 mV. Ideally I want to amplify this signal such that the mV fluctuations become about 1V. In other words I want to amplify the ...
-1
votes
2answers
63 views

Is the ultimate purpose of electronic circuits always to supply power to other devices? [closed]

I studied physics and computer science, so sadly im not too familiar with electronics. My question is kind of weird but hear me out: After reading a bit about (simple) electronic circuits, I got the ...
8
votes
6answers
1k views

Why is superheterodyning better than direct conversion?

What is the advantage of having the extra stage of IF, extra local oscillator and extra filtering stage and amplification. It just seems like more work and circuitry. Surely the direct conversion to ...
0
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1answer
37 views

Communication in presence of noise: Why is the number of distinguishable amplitudes K*sqrt((S+N)/N)

In section VII: The Capacity of a channel in the presence of white thermal noise in his 1949 paper Communication in the presence of noise, C.E.Shannon says, that for a signal with average power P, ...
0
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1answer
110 views

0-12V square wave to -6 +6 sine

We're working on a car where we've replaced most of the electrical system. We've also replaced the transmission, and the new gear box doesn't have a speed sensor that we can use for the instrument. ...
-1
votes
2answers
99 views

Maximum information Rate? [closed]

It is said that we can transmit at the most twice as many bits information per second as the transmission channel has the bandwidth. For example, 1 kHz bandwidth allows max 2kbit/s, if that rule is ...
1
vote
0answers
74 views

Low latency wireless audio transmitter

I am working on a project that requires low latency wireless point to point audio transmission at short distance using a digital transmission technique (ideally 24bit 96khz audio, 30 metre max) at a ...
2
votes
2answers
63 views

Can CML differential signal lines be flipped to act as a NOT gate?

If I want to invert a CML differential D-Flip Flop (Ex: hmc747lc3c) output before entering into a CML Counter(Ex: MC10EP016), is it as simple as flipping the signal lines before entering the counter? ...
1
vote
3answers
136 views

Analog circuit for moving-mean/moving-average

As a part of signal conditioning stage I am trying to find the moving mean/moving average of a signal at the output of instrumentation amplifier (used LM324-N for instrumentation amplifier). Is it ...
1
vote
2answers
74 views

Discarding divergent sensor data from running average

I'm building a inductive vehicle loop detector. By measuring the frequency of a LC-oscillator where the cars will pass over the inductor of the LC-Oscillator. If the cars pass over the inductor the ...
0
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0answers
78 views

Time delay using IIR filters

I am trying to implement a cardioid pattern with two microphones. I was reading this paper titled "Digital Filter Array Optimization for Directivity Pattern". The link to download the paper is this. ...
4
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4answers
110 views

Sampling Theorem and reconstruction

I do not understand a concept about the Nyquist - Shannon sampling theorem. It says that it is possibile to perfectly get the original analog signal from the signal obtained by sampling if and only ...
0
votes
1answer
47 views

How to implement a dirac delta as input signal for this system

y[n] = b0x[n] +b1x[n-1] I have this MA filter in matlab as following ...
0
votes
1answer
70 views

Artec QDD2 reverse voltage problem

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 allowing the bypass on ...
0
votes
2answers
80 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 ...
0
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1answer
22 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 ...
0
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1answer
30 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 ...
1
vote
1answer
39 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 ...
0
votes
1answer
45 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 ...
1
vote
3answers
55 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 ...
2
votes
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
vote
1answer
69 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 ...
0
votes
0answers
44 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 ...
0
votes
1answer
64 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 ...
0
votes
1answer
83 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 ...
1
vote
0answers
50 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. ...
0
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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
votes
2answers
138 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\$...
1
vote
2answers
140 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 ...
0
votes
1answer
101 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 ...
0
votes
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
votes
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
votes
3answers
425 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 ...
0
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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 ...
0
votes
1answer
78 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 ...
0
votes
3answers
72 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....
2
votes
0answers
80 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 ...
0
votes
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 ...
3
votes
2answers
197 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 ...
0
votes
0answers
36 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 ...
1
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0answers
35 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 ...
0
votes
0answers
49 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 ...