Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

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68 views

Is the peak to peak amplitude of a NTSC composite signal always the same?

I am currently trying to learn more about video signals. I'm particularly interested in NTSC since I live in North America. I recently bought an oscilloscope (Siglent SDS1104X-E) and I am trying to ...
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2answers
60 views

How to identify low pass, high pass, band pass, and band stop filters?

I'm taking a course dealing with signal processing which includes filters. In a certain task I got these two filters h and g: These parameters are given: A1=159 A2=138 theta C = 0.26pi N=337 Both ...
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1answer
61 views

Strain gauges' readings at 1 kHz

I want to connect 8 strain gauges to an aluminum scooter frame and capture readings at 1 kHz. The strain gauges are Full bridge 350 ohms with a very small output voltage (in the range of mV). I have ...
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2answers
67 views

Why can't you get the transfer function in time by taking inverse laplace of the transfer function in laplace?

In the KD9PDP's answer in the post below why can't you calculate the transfer function in time by taking the inverse Laplace transform of the transfer function in Laplace domain? The original post: ...
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3answers
85 views

single supply op amp non inverting level shifter for NTSC signal processing from 0-0.7Vpp to 2-2.5Vpp

I am performing an RGB modding of an NTSC CRT TV. By performing tests I found out that the chroma chip will accept 2-2.5V Vpp RGB signal to get the proper colors. So I need to amplify and shift my ...
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2answers
96 views

Normalize a sinusoidal wave to a fixed voltage [closed]

As input I have got a sinusoidal wave of variable amplitude (Vin). This amplitude can be whatever between 0.5 V to 5 V for example. I want to normalize this input to a fixed sinwave with amplitude ...
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1answer
118 views

How to detect dog bark? [closed]

I need to design a small dog bark detector. It should be as cheap as possible (10$ manufactured unit.) It should be accurate because it can be used anywhere in noisy places. The aproach I am ...
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2answers
71 views

Amplitude Spectral Density from a Fast Fourier Transformation

I want to calculate the Noise-equivalent Power (NEP) of a photodetector. Hereto, I have to measure the Amplitude Spectral Density (ASD) of the detector and divide the result by the Responsivity: The ...
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2answers
76 views

What is the purpose of negative frequencies? [duplicate]

Below you can see the frequency spectrum of a square pulse. But what exactly is the purpose of the negative frequencies? Lets say I have a square pulse with a width of 10ns (f=100MHz) and I want to ...
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0answers
55 views

What happens if the signal frequency exceeds the sampling rate?

As the title states, I was wondering what happens to the frequency contents of the sampled signal of a pure sinusoidal signal that exceeds the sampling rate. I am familiar with the shannon theorem and ...
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1answer
59 views

single zero in z-domain transfer function calculatio

I am designing a filter with two poles at DC and one zero at fs/10. For simplicity I choose fs=1; So my z-transfer function looks like: (z-z1)/(z-1)^2. Since z=exp(jwT)=cos(wT)+j*sin(wT). So if I want ...
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66 views

Pulse Doppler radar system simulation using MATLAB

How to code this project in MATLAB I'd tried coding this project (prob. 3-2, third paragraph) in MATLAB through this tutorial : https://www.mathworks.com/help/phased/ug/doppler-shift-and-pulse-doppler-...
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1answer
82 views

Instability in photodiode amplifier circuit

I'm using a UV LED and a Schotky photodiode sensitive to UV light to get an estimate of the concentration of a vapor that passes through the space between the UV LED and UV diode, but I'm having ...
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1answer
33 views

Amplifier gain in budget links

How does an engineer calculate the required power/low-noise amplifier gain after she/he is provided with the link budget of the system?
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2answers
92 views

CNY70 and LM358 amplifier circuit not behaving as expected

I have reproduced a circuit proposed by Nicholas Burnett in 2013: An improved noninvasive method for measuring heartbeat of intertidal animals please see Fig. 2 which looks as follows: The circuit ...
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0answers
29 views

Which is the bandwidth of an analog PAM (needed to design an amplifier)?

in a university test, I've been asked to design an amplifier for the following signal: $$s(t)=\left[\sum_{i=1}^{\infty}rect\left(\frac{t-t_i}{T}\right)\right]\cdot Acos\left(2\pi f_0t+\varphi\right)$$ ...
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78 views

what exactly prevents my smartphone from being used as an SDR without a dedicated dongle

The answer seems obvious (frequencies restricted by chips) but I'm looking for a clear and accurate explanation. Several examples of SDR projects connecting an SDR dongle to a smartphone are available ...
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1answer
43 views

FMCW Radar Signal Processing based on MIT Open Course

I am working on a self-made FMCW radar - for the signal processing, I am using the MIT open course (https://ocw.mit.edu/resources/res-ll-003-build-a-small-radar-system-capable-of-sensing-range-doppler-...
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1answer
87 views

Changing 0 V or 12 V into 12 V or 0 V

What is the simplest way to turn a regulated continuous analog DC +12 V (+/- 0.2 V) input signal into a 0 V output signal, and likewise turn a 0 V input signal into a +12V output signal? Two separate ...
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0answers
53 views

Representation of Fourier transform

I have a problem interpreting 2 different representations of Fourier transform and proving their property. In some texts Fourier transform is represented as : . While in other texts the complex number ...
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2answers
91 views

How to get signal out of Geiger-Muller tube?

I am building a nuclear random number generator using an LND-712 Geiger-Muller tube (GMT). I have built a HV power supply circuit that converts the 3.3V output of my Adafruit Feather RP2040 micro-...
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1answer
55 views

is using both Nyquist's and Shannon's Theorem possible?

For instance, say I have a cable bandwidth of 1 MHz, and a signal-to-noise ratio of 255, how would I calculate the maximum bit rate possible if I were to be transmitting data via this cable using 4 ...
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3answers
700 views

How to implement gain and offset in a single opamp?

I tried designer here in this page. But my particular case (Case 2) seems not working in the page. Then I Read this document and my case there, is section 4. But my calculation results are not ...
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2answers
61 views

Need help with signal conditioning

I want to use a sensor that delivers a DC voltage that varies from 0.174V to 1.174V depending on the temperature. After processing the signal, I want to have a voltage between 1 and 9V (when Vin = 0....
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1answer
47 views

How to properly remove an op-amp from this signal amplifier circuit?

This is a pulse shaping circuit, that has three amplifiers: U1, U2, and U3. The shaping amplifier is the 8pin component far right. Both U1 and U2 serve as "coarse gain," which are activated ...
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1answer
53 views

Confusion regarding terminology [closed]

Originally i asked this question on DSP SE yesterday but untill now couldn't get even a single comment so I am reproducing my question here as bigger audience is available here and also my question ...
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1answer
39 views

How to find the relative bandwidth /frequency of a aperiodic signal?

I have a transfer function with a fixed cut off frequency and I wanted to apply an input proportional to time(x= cont*time), also the condition is to have a frequency greater than the cut off ...
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1answer
45 views

DC filtering for digital audio amplifiers

I am working with digital amplifiers and from what I can see there is a DC blocking filter that is placed at the start of the signal chain. Why is this DC filter placed at the start of the signal ...
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1answer
44 views

AC to DC signal to drive a MOSFET

I need to intercept a 220V AC line to drive a 3.3v MOSFET that activates (for example) an LED. Looking around, a solution could be to use an AC/DC converter but they are meant for powering (so mostly ...
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1answer
54 views

How to replicate/simulate experiments done on dsp kit 6713 without using hardware? [closed]

Although i posted this question on DSP SE yesterday but still couldn't find any helpful reply there so i am reposting my question here Due to covid, our university is now offering online classes to ...
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38 views

VSB AM and Complex envelope

I'm trying to solve a problem below. I've already solved (1), but not (2) yet. The term 'lowpass equivalent' means 'complex envelop' in this textbook. And this is solution of problem(2) Where does ...
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1answer
83 views

Friendly target identification in radar

Crossposted from Signal Processing stack exchange, How do radar systems identify friendly targets to avoid AA locks during combat scenarios? Do friendly planes broadcast a known signal or is something ...
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1answer
56 views

Types of sampling and signal processing: some conceptual questions

I'm studying signal processing and right now I'm going through types of sampling and how they apply, advantages and disadvantages. I have some questions about these concepts that I would like to ...
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1answer
43 views

Graphing using vector signal analyzer

I am having trouble trying to create this graph using vector signal analyzer. I am still new to using this device and any help with setting it up would be helpful. The first and second photo are what ...
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2answers
56 views

How to represent a sum of dirac delta function and a linear function in a graph? (convention question)

I'm working on my final assignment in signal's course that I'm taking. I want to represent the following function in a graph: \$ f(t)=\delta\left(t+1\right)+(t+1.5) \$ Where \$ -1.5<t<0 \$. ...
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29 views

Relationship between two differently sampled Fourier coefficients

Assume a periodic signal \$s(t)\$ with fundamental period \$T_0\$. If one were to use the period \$kT_0\$ to find the Fourier series coefficients, how would they be related to the standard Fourier ...
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1answer
42 views

Laplace Domain Representation for Phase Detector

I am trying to model an LTI system and determine the overall transfer function of the system. The setup consists of a laser signal being fed through some filters, amplifiers, etc. represented by ...
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0answers
51 views

Left half and right half plane zeros

In the common-source on the left, one can solve for the transfer function and see that there's a right-half plane zero at \$s_z = +g_m/C_{gd}\$. For the source-follower on the right, similarly you can ...
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41 views

A question on single-sided baseband signals

Can anyone provide insight on whether a radar is able to exploit a real baseband signal that has a single-sided spectrum?
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6answers
2k views

Why can the effective number of bits be a non-integer? What does this physically represent?

The effective number of bits (ENOB) describes the "real" resolution of an ADC. I paid no attention to it when I was first taking the class but now when I think about it I cant really make ...
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1answer
50 views

Calculate impedance in time and frequency?

I'm characterizing the impedance of a system. To get the impedance I apply a sum of sinusoidal voltage waves that basically looks like noise. I recorded the output current from the system. As you can ...
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2answers
105 views

Is the impulse response of a real system is always a real function?

As stated in the title, is the impulse response of a real system is always a real function? Can it ever be complex/analytic, etc.? I'm more interested in terms of radar systems. Any info would be ...
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0answers
57 views

AC signal gets unwanted DC offset when connected to circuit

Hi im a 4th year ELE student and I am creating a circuit which outputs 120khz square wave burst when it detects zero crossings from the input ac signal. Here is the circuit diagram Op amp 1 converts ...
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1answer
60 views

What does it mean for a “baseband” signal to be a signal near zero frequency range?

I'm trying to understand the intuition and math of "baseband." Wiki says it is a signal near zero frequency range. Don't all signals of any type need a frequency otherwise they are not a ...
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1answer
71 views

Drawbacks of RF downconverting?

I see a lot of RF systems use downconverting schemes in signal reception, like the LNBs for Ku-band TV signals. From what I read, digital downconverters do not harm the signal in the sense that no ...
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1answer
103 views

Difference between a frequency synthesizer and a frequency mixer

I have tried looking a couple different places but cannot find a concise explanation on the difference between a frequency synthesizer and a frequency mixer. My goal is to take a signal at 915 MHz and ...
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2answers
52 views

Signal averaging CCD

I'm thinking about signal to noise ratio of CCDs and I hope this is the right location to post my question. The Hamamatsu Learning Center seems to be a good starting point to learn about CCDs. I ...
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0answers
56 views

Load curve control via differential pair

Last few weeks I have been designing a circuit, which is inputted with saw wave and outputs (amplification fairly linearly if possible) amplified voltage across two loads, where load voltage/current ...
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0answers
36 views

Spectral properties of QPSK modulation

From what I've read, the spectral properties of the modulation largely depend on the rate of change of the signal phase - "a signal in which the phase changes stepwise has a broad spectrum, well ...
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3answers
619 views

What is the physical significance of skewness and kurtosis of an eletrical signal?

I understood the mathematical meanings of the skewness and kurtosis. But when we calculate these quantities for a signal (say an electrical voltage signal), what physical meaning do they convey? For e....

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