Questions tagged [digital]
The digital tag has no usage guidance.
0
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0answers
20 views
Training Fractionally Spaced Channel Estimator and Equalizer
If you are attempting least squares channel estimation with a fractionally spaced channel estimator, do you want the training sequence to also be fractionally spaced or symbol spaced? It looks like ...
1
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1answer
92 views
polyBLAMP anti-aliasing in C++
How should 4 point polyBLAMP work. It does not really seem to dampen aliasing.
I have an floating point digital audio oscillator that makes a +1.0f jump at the end of every period.
My question is, ...
0
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1answer
18 views
Can we band-limit a PCM signal? Is it even relevant to relate a totally Analog term(Band limit) with digital one(PCM)
Can we band-limit a PCM signal?
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1answer
62 views
Follow up question regarding: “Complex sampling can break Nyquist?”
I'm having some trouble understanding the sample rate limitations when considering a complex baseband signal.
I understand (based on the linked SE questions below), the either (1) physically ...
0
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1answer
30 views
Using Matlab/Simulink to build Reader based on Software Define Radio
I am a student. I want to learn about Software Defined Radio to build a Reader for Saw tag and simulate them on Matlab/Simulink.
These bocks below is what I want to build in Matlab/Simulink
I found ...
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1answer
37 views
Modulating ofdm in audio spectrum
Trying to modulate audio with OFDM data.
My fs = 44.1khz, i'm using 64 sub-carriers, but i'm only using 5 sub-carriers for data, so my bandwidth is about 3.445khz. I'm not sure how to properly write ...
1
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1answer
32 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 ...
1
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1answer
27 views
How does cascading low pass modules affect pass band ripples?
This question 10.21 is taken from GATE IN paper 2015.
I don't understand the answer given,
I mean why is the frequency response at the pass band frequency considered to be $(1-\delta)$, isn't the ...
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0answers
33 views
Noise Shape Digital Filter
My objective is to build a noise shape filter from a given transfer function (in one case) and from a given PSD (for another case). Checking my precedent questions you can see that this argument is ...
0
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1answer
184 views
BIBO Stability in Z-domain
I'd really appreciate it if someone could please explain to me the condition for a LTI system to be BIBO stable, in z-domain.
I have a background in control, and in linear control for example, if we ...
-1
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1answer
73 views
Digital Derivative
I need to calculate the derivative of a digital signal (sinusoidal). In one of the papers they have mentioned Gilbert transformation is used to calculate the derivative. But I have searched in the net ...
2
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1answer
119 views
Block Diagram for a difference equation
I have this little doubt regarding how to draw a block diagram representation of a difference equation. Let us implement $ y(n) = ay(n-3) + by(n-2)+cy(n-1) + x(n)$ in block diagram where $a, b, c$ are ...
1
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1answer
47 views
Why are binary signals drawn continuous in time despite being a digital signal
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) ...
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1answer
55 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 ...
2
votes
3answers
78 views
Why must the angle contain $\pi$ for $\cos$ be periodic?
The $\cos(\frac{n}{6})$ is aperiodic, and $\cos(\frac{n\pi}{6})$ is periodic, why? What role does the $\pi$ play? By the way, $n$ must be integer
I have seen this question,Why is cos(n/6) aperiodic? ...
0
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1answer
44 views
Glitches in certain frequencies
I am trying to produce some simple audio waves using WASAPI (Windows Audio Session API). If I skip all the abstractions, my program basically receives a buffer from the API, then writes results of a ...
-1
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2answers
267 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 ...
1
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1answer
79 views
Do integration/differentiation processes work as simple filters?
How these processes are different from simple IIR 1 order filtering, FIR filters in terms of amplitude and phase characteristics?
0
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1answer
174 views
Second order section digital Bandpass
Does anyone have a ressouce on how I can calculate second order section bandpass coefficients?
What I tried allready:
I used following formulas from the Book Electronic Circuits (U.Tietze, Ch. ...
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0answers
221 views
2x oversampling by inserting zeros?
I am making a digital filter. I order to avoid aliasing I want to oversample it x2.
I am new to oversampling. But I read that you just insert zero inbetween each sample, and then apply a low pass ...
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0answers
61 views
Processing digital sound in Audiokit to sound like the 1960's
I am looking to imitate 70's analog equipments sound. I was wondering is there a way to create tape saturation / distortion inside Audiokit? I want to add that and randomized tape crackles and ...
2
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1answer
398 views
Bandwidth and Bit rate
I'm kind of confused about digital transmission.
Is the bandwidth occupied by some digital signal the Fourier spectrum of the bit (pulse) format,or the one determined by the bit rate?
0
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1answer
50 views
Subtract a digital filter from another filter
How to subtract a digital filter from another one, if their lengths are different. How to make the length equal.
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0answers
46 views
How does bandwidth affect a modulated digital signal? [duplicate]
I'm currently reading up on how the lower layers of the ISO/OSI model work and I don't quite understand how broadband communication works yet.
Suppose I want to send some data from point A to point B ...
0
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1answer
700 views
Compare two wave files
I have two .wav audio(stereo) files to be compared. The files may vary in frequency or amplitude or phase shift. How to compute the difference between the wave files in Scilab? The expected output is ...
-3
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1answer
292 views
Comparison using cross correlation [closed]
I have 2 stereo audio files to compare.
Comparison of files include change in frequency, amplitude, phase shift
Code:
...
0
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0answers
119 views
Digital Differentiators with lowpass of order n
My problem is finding the derivatives of a measured signal. The signal contains high frequency noise down to frequency $\omega_{noise}$. The signal thus has to be lowpass-filtered and the derivatives ...
1
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3answers
492 views
Applying Nyquist theorem to digital vs. analog audio quality
I had a recent conversation with a friend about analog vs. digital recordings. He shared his opinion that music recorded by analog techniques is of superior sound quality to music recorded by digital ...
0
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1answer
520 views
How do I calculate the bandwidth from a waveform?
Suppose I have a waveform $x(t)$
where $x(t) = 5 + 30\mathrm{cos}(2000\pi t) + 10\mathrm{cos}(6000\pi t)$ that is to be uniformly sampled for digital transmission, how do I calculate the bandwidth of ...
0
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1answer
976 views
difference between GMSK (Gaussian Minimum shift keying) and GFSK (Gaussain frequency shift keying) [closed]
I am unable to differentiate GMSK and GFSK.
How do the modulation techniques differ in Tx?
How do their receiving techniques differ..?
1
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1answer
84 views
Galois Field implementation
Just a quick question. What Galois Field is best if you need a minimum Hamming distance of $n$? I want to design a BCH generator polynomial that is acccording to this Hamming distance.
3
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2answers
313 views
Why is CDMA not enough for wireless communication?
I have a question about CDMA, FDMA and TDMA.
I don't understand why we suffer from limited capacity when we have CDMA.
I can understand the limitation in FDMA and TDMA, as time and frequency are ...
3
votes
2answers
936 views
Average bit error and symbol energy
How do you draw decision boundaries given this type of 16-qam constellation diagram, I know that there should be no vacant decision boundary but I can't seem to get it.Also, assuming that the correct ...
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2answers
1k views
Analyzing a 16-QAM modulated waveform?
Okay I'm really confused about analyzing the waveform I generated using 16-QAM on MATLAB... I transmitted a $y = [0 \ 1 \ 2 \ 3 \ 4 \ldots \ 15]$ discrete signal (in order) to ...
4
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1answer
18k views
what's the pass band ripple and stop band attenuation of a digital filter?
Hi i'm a beginner in signal processing i want to know what'sthe pass band ripple and stop band attenuation of a digital filter ?
Thanks.
5
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1answer
218 views
Why in Overlap Save Method in DSP output length comes out to be same as input length?
I know that when we do convolution of $x(n)$ (Length $L$) and $h(m)$ (Length=$M$), length of output data comes out to be $L+M-1$, but when we break a large sequence of data and find output using ...
0
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2answers
66 views
Why the correct probability for a square M-QAM is equal to the square of correct probability of ($\sqrt M$)-PAM?
The question is why:
$P_c (\text{square} $ $M-QAM) = (1 - P_{\sqrt M})^2$
where: $P_{\sqrt M}$ is the error probability for $\sqrt M$-PAM signal.
Thanks.
4
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3answers
179 views
Sampling and Reconstructing Digital Signal
Say that I have a digital signal (a bitstream actually) whose output changes every 100 mS. I don't know exactly when it changes relative to my sampling, only that that the next bit to capture appears ...
3
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5answers
292 views
Differentiating between zero and not sending for OOK
How would a trigger works for on-off keying (OOK)? How would it differentiate between not receiving anything and zero?
0
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1answer
16k views
What is the difference between continuous, discrete, analog and digital signal?
It's my first time studying DSP and I've faced a problem finding a convenient definition.
Are the following definitions correct? And if so why there are some resources defining it in other terms such ...
0
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1answer
55 views
Canonical Rectangular Modulation
http://zone.ni.com/images/reference/en-XX/help/371025N-01/loc_eps_rectangular_modulation.gif
I just wanted to make sure that my assumption that in this figure $\phi(t)$ is representing $m(t)$, and $R(...
1
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2answers
472 views
Detecting which digital number an image represents
I photograph the dashboard of my car every day to register the mileage for work.
I use OpenCv to detect the region of the digital displayed mileage, crop to the numbers and match them. The method I ...
1
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2answers
417 views
Calculation of actual analog input from bipolar ADC's output
I have a $14$-$\textrm{bit}$ ADC which can take $-10\textrm{ V}$ to $10\textrm{ V}$ as input. So, $0$ to $16383$ (digital) represents the voltage from $-10$ to $10$. If I want to get the actual ...
0
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1answer
196 views
why does the decision boundary change in BPSK? is it true?
I am working on modulation and demodulation of BPSK using python. i made a code for modulation and demodulation,while demodulate i tried to compare my actual data bit stream with demodulated bit ...
1
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3answers
121 views
Linearizing digital-analog converters
I'm looking at ways to improve the effective resolution of DACs. It seems that element mismatch (i.e. integral non-linearity) is the main contributor to distortion in modern DACs. Apart from ...
1
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1answer
74 views
Digital Filters deal only with samples, right?
I'm new to digital filters. So I'm trying to get things right and I can't find an explicit answer to my question on the internet.
Question: Digital filters only accept samples as input? I mean the ...
3
votes
1answer
118 views
2-D Digital Signal Processing
I have been doing my research on 2D digital signal processing. What I am doing is about noise removal of digital image:
Type of noise that I want to remove from an images is like the Gaussian noise ...
2
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0answers
1k views
Simple (Arduino) digital butterworth filter : why do I see oscillations?
I want to filter deviations from an ADC over time (low pass), not very critical. So I first tried exponential averaging, something like y= (7*y+x)/8. That gave useful results, but there is an obvious ...
2
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2answers
304 views
DAC to Analog Filter to ADC
As the order of filter needed for digital information gets higher, it takes longer to process and requires more memory. Maybe analog filtering could be of use here. I know that the words analog and ...
0
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0answers
70 views
Multi-Channel LTI Inverse system problem
A sequence $x[n]$ is the output of a linear time-invariant system whose input is $s[n]$. This system is described
by the difference equation
$(1.1)$ $$x[n]=s[n]-e^{-8\alpha}s[n-8]$$
$$\alpha>0$$
a)...
