# Questions tagged [analog]

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### Why is TV static noise always black and white?

Most modern day Cathode Ray Tube (CRT) televisions manufactured after the 1960s (after the introduction of NTSC and PAL standards) supported the circuit-based decoding of colored signals. It is well ...
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### Why do we use window in time domain rather than do FFT modify the spectrum and than inverse FFT

I thought that DSP would be done by using FFT of portions of a signal, modify the samples that result from FFT (since they represent the spectrum of our signal + noise) and remove any unwanted signals ...
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So while answering how to design a PI controller for a first order time delayed system (Question Here ) Here is the closed loop equation to a control system: $$G_C(s) = \frac{\frac{K}{T}(1-sT)(s)... 2answers 1k views ### Understanding a Bainter Circuit (chebychev filter) As part of a class in Signal Processing, I am building a 3rd order Chebychev band reject filter. We implement this by using three cascading Bainter circuits. Although not part of the class, I have a ... 8answers 9k 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 ... 3answers 390 views ### Going from digital to analog filters I've been learning about digital signal processing for some time, and I understand the principles in the digital world, as well as the conversion of continuous filters in the s-domain to digital ... 2answers 2k views ### How increasing the Signal to Quantization noise increases the resolution of ADC Inside ADC we have a quantizer, when the sampled signal is passed through it, the signal values get discretized. The number of discrete levels in which the signal is discretized is called the ... 3answers 220 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, ... 1answer 74 views ### Is gamma correction applied in my setup I am working on a scientific application where I would like to evaluate luminance in an image, however I am unsure if what I receive from my setup is luminance (Y) or luma (Y'). I use a camera with a ... 1answer 2k views ### Analog signal can be discrete time? I am new to this site and field too.I always thought analog is continuous and digital signal is discrete. I read this today and got confused about analog signal Analog can be continuous time(CT) ... 1answer 735 views ### Are there characteristics of photographic film that would make it an analog medium? There was an article a few years ago entitled "Analog is Not the Opposite of Digital". Film is not analog, period. I used to shoot film on a Canon AE-1 from the ā70s. Now I have a digital ... 1answer 192 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, ... 1answer 49 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 ... 1answer 85 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 ... 1answer 490 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 ... 1answer 3k views ### Understanding “voltage” and “power” in SNR of a sampled signal I'm facing a gap in my understanding of when a signal is a "voltage" signal and when it is a "power" signal that I've always managed to avoid resolving until now... First what I think I understand, ... 2answers 2k views ### Analog Hilbert transformer I know the FIR approach, I have seen IIR, to, but I'd like to know if it's possible to implement a Hilbert transformer in analog domain, i.e. with integrators instead of delays. Is it possible? If yes,... 3answers 12k views ### If Digital Signal has frequency components then why we don't use it As we know there are two kinds of signals: analog signals and digital signals. And there are two common techniques for multiplexing the signals: Time Division Multiplexing (TDM) and Frequency ... 2answers 20k 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 ... 2answers 363 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 ... 1answer 1k 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) ... 1answer 430 views ### Plotting the discrete time signal Consider the following analog signal$$x(t) = 2 \sin(100\pi t)$$The signal x(t) is sampled with a sampling rate F_s=50\textrm{Hz}. Determine the discrete time signal. Plot the discrete time ... 1answer 350 views ### Can we determine if a filter is butterworth or chebyshev from its physical topology? Can all analog filters be classified as Bessel, Elliptic, Butterworth or Chebyshev? Given a physical ladder topology of several stages of {L, C or LC} in {series or parallel}, is it possible to ... 0answers 306 views ### Designing a practical integrator One way to describe a practical integrator ("leaky integrator") is$$ H(s) = \frac{g R}{1 + sRC} $$I am trying to understand how to choose the values g, R and C because in practice, I will ... 1answer 387 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 ... 3answers 218 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 ... 3answers 834 views ### FIR analog low-pass filter? Is there a way to construct FIR analog low-pass filter? (By this, I believe I am asking for no-pole analog low-pass filter, in terms of Laplace transform.) 1answer 132 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 3answers 730 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 ... 4answers 294 views ### Signal and Space/Time I have been reading a couple of definitions on signal such as: Any quantity measurable through time over space or any higher dimension can be taken as a signal. And this, In the physical ... 2answers 657 views ### Nyquist frequency and DC Im studying the DSP book by Steven W. Smith. On page 41 he covers the Nyquist frequency. He makes up an example by writing the following. ... consider an analog signal composed of frequencies ... 1answer 215 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., ... 2answers 2k views ### Relation between Normal Phase Shift of a wave and Phase Modulation I am little confused with the Phase Modulation and the phase of a sine wave. I get the phase modulated wave from the google images as below: Phase modulation has the form:$$PM(t)=A_c \cos\big(2\pi ...
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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 ...
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### 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??
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### 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 ...
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### Two signals with the same frequency in the same area can interfere?

If one signal is transmitting form transmitter $TX_1$ with some frequency $X$ and some other transmitter $TX_2$ is sending some other signal with same frequency $X$ will there be any clash or ...
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### 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?