Questions tagged [analog]

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How to measure process gain of DSSS

I have a replicated a Direct sequence spread spectrum link (schematics taken from ARRL SS handbook) and would like to measure performance characteristics such as process gain. I have 2 questions. I ...
Mohamed Abuain's user avatar
2 votes
2 answers
184 views

What is the meaning of the filter coefficients in case of an analog filter?

I'm trying to improve my poor understanding of analogue filters. Similarly to this question, I've always wondered why libraries like scipy offer an option to design an analogue filter, and when I ...
bluenote10's user avatar
4 votes
3 answers
330 views

Emulating an analog Oscillator in DSP

I'm quite new to digital signal processing and currently learning the ropes. I'm fascinated by the concept of emulating analog circuits with DSP and I'm eager to understand how one might emulate an ...
thc's user avatar
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Can the NODAL DK Method Be used for discretizing an analog circuit with OTAs?

I'm exploring the discretization of analog circuits and have come across the NODAL DK method as a potential technique. I'm curious if this method is suitable for circuits that incorporate Operational ...
thc's user avatar
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4 votes
1 answer
458 views

Scipy filter analog vs. digital

It would be greatly appreciated if the usage of the python package scipy's filter (e.g. butter) analog=True argument could be explained. I don't understand what is meant by this (any signal being ...
Joseph's user avatar
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33 views

Sampling Oscillators for Lookup Table

I have couple of analog synthesizers and I want to turn their oscillators into code. I've been reading about how to do it for a while and making a lookup table seems just right for me. I've been ...
someoneunimportant's user avatar
0 votes
0 answers
40 views

Phase Unwrapping [duplicate]

I'm also quite new to world of radar signal processing. I don't understand why we have to make phase unwrapping process. Could you light in me about it? It would be nice conversation speak about it. I ...
Paroz's user avatar
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2 votes
2 answers
165 views

Relation between Causality and the Phase response of an Amplifier

I am trying to model the response of an amplifier. As per the main answer on this question, if one wishes to do so, they have to look at the Fourier decomposition of the input signal $x(t), \, \tilde{...
Heath's user avatar
  • 131
5 votes
2 answers
327 views

Amplifier Placement in a Wireless Receiver

In the context of wireless receiver system design, what is the optimum choice of amplifier placement? Should the received signal be amplified first then filtered or should it be the other way round? ...
malik12's user avatar
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2 votes
2 answers
200 views

How basses are reconstructed on small speakers

Not sure I'm in the right StackExchange group for this question, but it seems linked enough. Let me know if it's not the case. I heard about an acoustic and/or signal processing technique that allows ...
Pierre Mardon's user avatar
1 vote
1 answer
277 views

DSP alternatives

A standard IoT device might include a sensor, analog to digital convertor, and processing unit. All of those components could be integrated into one system on a chip. What are the alternatives to ...
Gideon Genadi Kogan's user avatar
0 votes
1 answer
210 views

calculate the normalized angular frequencies

I have two discrete time signals $x_1[n] = 2\sin\left(\frac{2\pi 3.5n}{64}\right)$ and $x_2[n] = \cos\left(\frac{9n}{64}\right)$ I have to calculate the normalized angular frequencies. What I have ...
Gunners 's user avatar
0 votes
2 answers
72 views

What's the purpose of dividing the light and combining back in TV Cameras?

This is usually a two-part, trichroic prism that divides the light into separate red, green, and blue beams, each of which is detected by a separate CCD or CMOS image sensor. A circuit (3) ...
Sammy Matt's user avatar
0 votes
1 answer
90 views

Time delay of LPF to exponential decay amplitude input

How can one calculate the time delay a Low Pass analog filter adds from steady state when the amplitude of the input signal decays exponentially?
Giorgos K's user avatar
20 votes
3 answers
4k views

What sampling frequency should I use if Nyquist is not available?

I have the following homework question that confuses me: We have an audio emitter that can emit two signals: It either emits a sine wave at 23 kHz or it emits a sine wave at 25 kHz. The receiver has ...
NN amateur's user avatar
2 votes
2 answers
225 views

Amplitude and phase compensation of analog filter

My analog filter perform much needed antialiasing and input protection. Unfortunately, the filter adds undesired changes in the gain/phase across frequency. For example, here is an example of ...
Ethan Goldstein's user avatar
3 votes
1 answer
155 views

Different formulations of Chebyshev II resulting in different poles?

I am currently trying to implement a C++ program to calculate digital filter coefficients using a Chebyshev Type II filter design technique. The text I am using to understand the theory of the ...
dmedine's user avatar
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1 answer
36 views

Is there a separate word for the time domain when working with digital signals?

Typically the phrase "time domain" implies an analog signal x(t), but I've also seen it referring to a digital signal x[n]. Is there any phrase that refers to x[n], but not x(t)?
user8577930's user avatar
1 vote
0 answers
37 views

Simulating Effects of Sampling after Butterworth Filter

Is there anyway to simulate the effects of sampling an analog signal with Python/MATLAB? I am trying to show what happens to the frequency domain (magnitude and phase) of the analog signal after it ...
SamC's user avatar
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0 votes
1 answer
213 views

Band limited discrete signals division

If I take two analog, band limited signals $ x(t) $ and $ y(t) $ with non-zero $y(t)$ I can define the division: $$ z(t) = \frac{x(t)}{y(t)} $$ In general $z(t)$ may have a very wide bandwidth, also ...
Andrea's user avatar
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0 answers
52 views

Analogue Filters (Picking the right filter!)

I'm new to Analogue and I'm trying to find the Ideal filter for the following specifications: $0.1\ \rm dB$ ripple Cutoff Frequency $F_c = 80\ \rm{kHz}$ An attenuation of $40\ \rm dB$ at the stop-...
Pix's user avatar
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2 votes
2 answers
977 views

Fractional Bandwidth of a Gaussian Amplitude Modulated Signal

a gaussian modulated sinusoidal signal may be expressed as $$x(t)=A\cdot e^{(j2\pi ft)}\cdot e^{\left[-\frac{1}{2\sigma^{2}}\cdot(t-t_{0})^{2}\right]}$$ Let's consider the case in which the gaussian ...
Kinka-Byo's user avatar
  • 324
1 vote
1 answer
315 views

Combining Analog Video Signals for Diversity Receiver System

The system I want to build takes an analog video from two receivers (that are receiving from the same transmitter) and then combines the signals using equal gain combining (or maximal gain combining ...
kkuehn's user avatar
  • 13
0 votes
1 answer
50 views

Modulate Bipolar(?) signal

I want to modulate this signal if possible with an Arduino, but have no idea what circuit can help me here. Let's ignore the timing and the measurements from the image for a moment, my problem is more ...
Tim's user avatar
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3 votes
1 answer
77 views

Why is a bandpass filtered analog PM signal still PM and not AM

I know, that in theory a sinusoidally phase modulated (PM) signal with an expression like $\Re(e^{\mathrm{j}k\sin(\omega_s t)} \cdot e^{\mathrm{j}\omega_ct})$ with the signal frequency $\omega_s$, the ...
Uroc327's user avatar
  • 231
0 votes
1 answer
211 views

why don't we use Broadband technology to transmit digital signals ,and use Baseband technology to transmit analog signals? [closed]

I learn the Broadband technology and baseband technology in this website: https://www.computernetworkingnotes.com/networking-tutorials/differences-between-baseband-and-broadband-explained.html ...
Shine Sun's user avatar
  • 159
1 vote
1 answer
176 views

Are there analog re-configurable filters?

I know that we can build a chip (or circuit) or use FPGA to have re-configurable digital filters. But how about analog filters, can we have re-configurable analog filters? thanks
Amro Goneim's user avatar
0 votes
1 answer
2k views

Analog Square Root Raised Cosine Filter

I am wondering if it is possible to realize an analog square root raised cosine filter. Any idea about how to do that with Matlab?
Amro Goneim's user avatar
-1 votes
1 answer
107 views

How to convert between function forms of single frequency signals

I have an equation x(t) = (3+4j)*e^(j*8*pi*t)+(3-4j)*e^(-j*8*pi*t) and am trying to convert between this and shifted sines and cosines. I'm attempting mash this through euler's formula and got a 10 ...
Braimp985's user avatar
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0 answers
65 views

Is this PSK or FSK

I am analysing a captured 433.92MHz signal sampled at 2MHz: If we zoom in: I am thinking this is PSK? Am I wrong? Thanks
nachofest's user avatar
0 votes
1 answer
82 views

Obtaining a high sample rate digital approximation to an analog filter from lower frequency measurements

Consider a set of dense, but generally irregularly-spaced frequency response measurements of some real low-pass analog filter. Denote the maximum frequency for which a frequency response measurement ...
rhz's user avatar
  • 447
2 votes
1 answer
118 views

phase response of an analog filter

I am trying to understand the relation between phase response of an analog filter and its influence on the quality of a signal with PSK modulation. For example I want to design a BPF for HF ...
dcs's user avatar
  • 45
1 vote
1 answer
536 views

When calculating SNR, is noise included in signal?

Given a signal $x(t) = s(t) + n(t)$ where $s(t)$ is the desired signal voltage and $n(t)$ is the noise, should the signal to noise ratio of this signal be 20log(xrms/nrms) or 20log(srms/nrms)? i.e., ...
Dave's user avatar
  • 13
1 vote
1 answer
461 views

Binary and Quadrature Phase Shift Keying [duplicate]

I was learning Modulation Techniques and was on the topic Phase Shift Keying (PSK). As far as I have understood, In Binary PSK we encode a single bit on a one signal element and we differentiate ...
Abhijit Singh's user avatar
0 votes
1 answer
108 views

The phase of signal when it passes a frequency divider?

When we used the microwave frequency divider, such like: RF Bay FBS-N-14 or analog dividers in wiki. The input signal is $\cos(\omega t+\phi)$, and the output signal is $\cos(\frac{1}{2}\omega t+\...
Hewie Ding's user avatar
4 votes
1 answer
937 views

Compensating the Group Delay of an Analog Filter using DSP

I am having a problem in my current project where I need to measure different biological signals (like ECG) simultaneously. As the instrumentation hardware is developed by different people over time, ...
falsterbo's user avatar
  • 151
3 votes
1 answer
171 views

analog-to-discrete-to-analog system sampling problem

This is not a homework problem, I am solving practice problems for my exam. Consider the analog-to-discrete-to-analog system shown in figure 1. The CT signal $x_a(t)$ is sampled at a frequency of $...
user avatar
0 votes
2 answers
259 views

Is it possible to just remove the noisy part of signal?

Is there a way to scan through a signal and remove the parts that don't look "normal". This would mean using more advanced then a simple pass band filter, but something that can look at a period in ...
sgmm's user avatar
  • 133
2 votes
1 answer
168 views

Signals sampling

I have a simple question, but sadly I'm kind of "noob" in signals theory. A signal having 4 harmonics at the following frequencies: 1 kHz, 2 kHz, 3.5kHz and 4.2 kHz. (How can a signal have harmonics "...
Uni Student's user avatar
1 vote
1 answer
94 views

How do I add more resolution / taps to an analog -> digital filter?

(I am trying to create an IIR audio filter that adds reverb to an initial sample) Say I designed an analog filter to model acoustic attenuation based on the following mathematical model: $$ I = I_0 ...
ntjess's user avatar
  • 111
1 vote
0 answers
104 views

Digital or analogue filtering?

I'm trying to self learn the art of signal processing whilst moving through my third year pure maths degree. Sorry if my terminology is incorrect however I hope I am understandable! I am looking at ...
Samil Horper's user avatar
0 votes
1 answer
277 views

Is it possible to encrypt an audio wave? NFL Example

In the NFL, quarterbacks receive playcalls from coaches over their helmet's wireless interface. Someone mentioned how occasionally, these radios will pick up interference from airplanes, and that ...
steve antwan's user avatar
0 votes
1 answer
601 views

OFDM RF signal waveform

From the Wikipedia article: "An inverse FFT is computed on each set of symbols, giving a set of complex time-domain samples. These samples are then quadrature-mixed to passband in the standard way. ...
user10010101's user avatar
-1 votes
1 answer
219 views

confusion between frequency and amplitude in digital to analog and vice versa conversion

bandwidth is defined as the difference between the highest frequency and lowest frequency. amplitude is the distance between the, let's call it a crest and a trough, in a wave. cycle is the time per ...
David Jercinovic's user avatar
0 votes
5 answers
129 views

How Can Telecommunication System Know Which Part Is Signal and Which Is Noise? [closed]

When signal is received how can receiver know which part of received signal is signal and which part is noise??
user48391's user avatar
5 votes
3 answers
946 views

Proof-of-concept for active noise cancellation to block consistent low-frequency HVAC noise transmission

Background We live in a multi-unit building where each unit's HVAC system/closet is located directly across a party-wall from the neighboring unit's bedroom, and adjacent to a shared external curtain ...
rjacobs's user avatar
  • 211
3 votes
1 answer
2k views

How to simulate analog VU meter response to audio?

I'd like to simulate the movement of an analog VU meter dial as shown below and often found on stereos and other music monitoring equipment. I just learned through this article by Rod Elliot (ESP) ...
Martin's user avatar
  • 31
-1 votes
1 answer
2k views

Amplitude ranges for different bit-depths

In Python, I am using the library Soundfile (which uses the library libsndfile) for digital sound processing. I am working with different sound files coming from different internet databases, and ...
sdiabr's user avatar
  • 209
0 votes
2 answers
391 views

Analog vs digital

If there are means to process all signals after they have been captured and digitilized, why are we still designing ICs to do analog signal processing? For any giving case, can not we just digitilize ...
Fakher Mokadem's user avatar
0 votes
3 answers
641 views

How to calculate the frequency response of LTI system based on measured impedance

I have an analog circuit containing unknown resistance, capacitance, and inductance. I have measured its complex impedance across the frequency range of interest. Is there an equation that will allow ...
Michael Krzyzaniak's user avatar