Questions tagged [digital]

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3answers
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Explanation of binning in frequency analysis post-FFT

I am creating an Android app which records sound for t seconds at a sampling rate of 44.1kHz with a buffer size of 8192 (16 bit mono samples). I need to plot a ...
3
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3answers
2k views

Digital filters with more zeros than poles

I am having trouble wrapping my head around digital filters with different orders of numerator and denominator. Let me know if any of these points is wrong: All (digital or analog) transfer ...
2
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1answer
318 views

Digital Vs. Analog Phase measurement [closed]

I'm working on a Ultrasonic Transducers resonance tracking system. Where phase shift between Voltage and Current is the feedback signal for my system when phase difference is Zero that means system is ...
6
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8answers
8k views

Nyquist Frequency Phase Shift

The figure below shows in dashed lines sinusoidal signals of the same frequency at three different phase shifts. The signals are then sampled such that the sinusoidal frequency is exactly a half of ...
2
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2answers
4k views

Carrier frequency offset (CFO) estimation using cyclic prefix

I understand the cyclic prefix, but in (1) it's said that: "If we consider that the channel effect is minimal and can be neglected. then the phase difference of the CP and the OFDM symbol which the ...
0
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2answers
252 views

Inverse of the Gibbs Phenomenon to generate a sine wave

I am a quite new to the area of digital signal processing. I am currently doing a project on sine wave generation. I know that according to Gibbs phenomenon, many sine waves add up to form a square ...
0
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2answers
847 views

Confusion with ADC conversion in MCP3424

I am learning about ADC MCP3422 Chip, because I want to use ADC Pi chip with my Raspberry Pi which is using MCP3424 ADCs, but I am having trouble understanding how the ADC calculation is done in the ...
0
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2answers
2k views

Digital filters and the Z-transform

Why is it that we Z-transform a difference equation to get a the transfer function of an digital filter? How come a digital filter is given in the Z-domain, and what is the Z-domain? And for that ...
4
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2answers
771 views

Spectral images - How do they appear during ADC?

Why is it that spectral images appear? I know they appear for $F_s$, but why those replicas appear, I don't know. E.g., sampling $x(t) = sin(1000 * 2\pi t)$ with a sample frequency of 230 Hz. I know ...
4
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3answers
213 views

Low analog lowpass + ADC vs High analog lowpass + ADC + low digital lowpass

I'm doing EEG data collection and my amp forces use of an analog lowpass filter before the ADC. I'm fairly sure that I won't be interested in phenomena associated with frequencies of 30Hz or higher, ...
4
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3answers
19k views

What is IQ Data?

I have no background in telecommunication. Could anyone please explain to me what is the IQ data in telecommunication? It will be best to explain it with some basic analogies. Many thanks!!
0
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2answers
371 views

Digital Panning Effect

To get a panning effect I know that there is a need for a Circular Matrix. The angle is can be set as a default or I can let the user to select the angle. So if the angle is $\theta$, the circular ...
10
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3answers
12k views

Digital Distortion effect algorithm

I read the DAFX book by Udo Zölzer about the distortion effect at pages 124-125 and it says that suitable simulation of the distortion is given by the function: $$f(x)=\frac{x}{|x|}\left(1-e^{x^2/|x|}...
1
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1answer
127 views

g(x)=x odd and even expansions

I'm studying book about digital filter by Richard Hamming. And there is exercise to get odd and even expansion of g(x)=x where x is from 0 to $\pi$. I understood even expansion, but can't get into odd ...
2
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1answer
3k views

What is spatial correlation and spatial convolution?

What does the term spatial correlation and spatial convolution mean with respect to digital image processing ?
0
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1answer
3k views

Gain of FIR/IIR filters

What are the formulas for signal and noise power gain of digital filters (FIR and IIR)? For a FIR, I've seen in Harris' windowing paper that the DC gain is the sum of the filter weights. $$ G = \...
3
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2answers
300 views

Ignoring Nyquist

What happens if I ignore Nyquist? I have a 16.368MHz digital signal coming out of a GPS front-end chip. My microcontroller (which is reading that digital stream of data) operates at a maximum of ...
1
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0answers
70 views

Find another cosine y(t), whose frequency is as close as possible to that of x(t),

I am going to be straight forward and say this is one of the problem sheets and I am stuck on one of the questions. I already know the answer as I have been given them but I am trying to work ...
3
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1answer
136 views

How to filter a regular ticking out of a digital (on/off) signal?

I have a digital on/off signal sampled at a regular interval. There was a problem with the sensor that produced the signal which has sometimes caused a regular on/off ticking when the sensor should ...
0
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1answer
1k views

Guitar Tuner or Guitar effects Algorithms? [closed]

I need to explore the algorithm of the digital guitar tuner or the digital guitar effects algorithms. Is there any Book or articles that you recommend of? All I know is that relate to DSP. thanks
3
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1answer
138 views

What is databending and how does it actually work?

http://www.google.com/search?q=databending It is, from what I understand, opening images as audio, applying effects, exporting back as image and voila! glitch-art Example: credit But how does ...
0
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1answer
601 views

Why Successive Approximation, Analog to Digital converter is most commonly used? [closed]

There are various types of ADC in used, like, ramp-compare ADC Wilkinson ADC pipeline ADC Flash ADCs Sub-Ranging ADCs Folding ADCs Pipelined ADCs Successive Approximation (Algorithmic) ADCs ...