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Questions tagged [frequency-response]

Frequency response is the quantitative measure of the output spectrum of a system or device in response to a stimulus, and is used to characterize the dynamics of the system.

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I need to insert an underwater acoustic channel model to an existing code that compared between OFDM and GFDM

The acoustic channel model that I have will output the channel impulse response. However, my signal is modulated in frequency domain (by doing fft). Hence, I want to obtain a frequency response of the ...
36 views

Compensate for microphone?

I have trained a machine learning model to recognize a specific audio event from mel spectrograms, and it works pretty well on a hold-out test dataset. I now want to run the model on a device and feed ...
900 views

The frequency response function (FRF) fails to detect the antiresonance of a system

I am trying to identify a vibrational systems by computing the frequency response function (FRF) of the system when a chirp signal is applied to its input. After comparing the FRF computed and the ...
24k views

How poles are related to frequency response

I have recently fallen into fallacy, considering pole s=1 as there is infinite response at frequency 1. Yet, response was only 1. Now, can you derive the frequency response, given the poles? ...
24 views

Finding frequencies(and bandwidth) that works best audio in a certain medium

Complete DSP and coding newbie(learning python). I am trying to find frequencies that can pass through well in a musical instrument tube. I am trying to find audio frequencies(audible and inaudible ...
34 views

Fourier Spectra : Significance of the Negative Amplitude [duplicate]

For example, for an aperiodic gate pulse, the Fourier Transforms for the continuous time case is a sinc function, while the discrete time case gives a sine over sine periodic kind of a function. In ...
26 views

Difference between the two forms of input-output relationships of an LTI system

$$y(t)=f(t)*h(t)\tag{1}$$ $$y(t)=H(s)e^{st}\tag{2}$$ $$H(s)=\int_{-\infty}^{\infty}h(t)e^{-st}dt\tag{3}$$ Let $f(t)$ in Eqn $(1)$ be $e^{st}$. In many worked out examples, I have found that the two ...
100 views

Frequency response of a microphone using a sine sweep

I want to determine the frequency response (magnitude, phase) of a microphone. I have another "good" reference microphone whose frequency response I know. I understand that I can use a good speaker ...
151 views

Is it right to talk about dynamic range on frequency domain?

I'm comparing three frequency response's plots from simulations and experiments and I observed that two of them look like clamped to a DC component, where the max dB value is i.e. 100 and the min is ...
170 views

RC circuit frequency response

I am developing a project where I must analyze an incoming signal that was acquired from a microcontroller. The objective is to obtain the main frequency of the incoming signal. At first, I’m ...
219 views

Find the impulse response from the frequency response

So I'm having a problem here which gives me the frequency response and asks for the impulse response: $H(\Omega ) = e^{-j\frac{\pi }{2}}$ for $\Omega>0$ and $H(\Omega ) = e^{j\frac{\pi }{2}}$ for ...
270 views

131 views

Backward finite difference differentiation filter frequency response

As title says what would be frequency response of backward finite difference differential filter, or what would be error of this differential filter, analyzed upon frequency of a signal?
86 views

Frequency Axis of Discrete Fourier Transform (DFT) with Odd Number of Data Points

I am trying to understand the logic behind making a frequency axis in DFT. I am using for time based light absorbance. When we have even number of data points (N= even integer), collected over a ...
103 views

Plotting the frequency response of a FIR filter

I am trying to figure out the mechanics of plotting the frequency response of a FIR filter. For example, I have used an algorithm (Parks-McClellan), to generate a low pass FIR filter with an even ...
43 views

How to design a a filter and how to determine the poles and zeros on the basis of following informations?

A sinusoidal signal of 300Hz frequency,3V amplitude is contaminated with line frequency (50Hz,1V). Design a digital filter including poles and zeros to remove the interference component. Consider the ...
21 views

Mathematical operations with given discrete frequency response function

Let's say I have a given discrete frequency response function H(w) and corresponding n frequencies as MATLAB arrays, ranging from 0 to 512 Hz. If I do an n-point FFT on a discrete time domain signal ...
74 views

Advantage of using DFT and IDFT hardware for modulation

I am doing a course in communications and while discussing multicaruer modulation to break down a signal into smaller bandwidths (for BW to be less than coherence bandwidth), there was mention of ...
Given the transfer function $$T(s) = \frac{100}{1 + \frac{s}{10^{6}}}$$ and the input $$v_i(t) = 0.1 \sin(100t)$$ find the output, $v_o(t)$. My approach was to use $v_o(t) = \mathcal{L^{-1}}\left\{T(... 1answer 58 views How do bode plots work with unstable systems work? If I had a system with right-half s-plane poles, how would a frequency response work? Since a purely imaginary value for s, would cause the Laplace transform to diverge for such a system, what meaning ... 1answer 33 views Relationship between Frequency response, magnitude spectrum and gain I have been reading quite a lot of DSP related materials online and offline (books etc.) lately. I come across the terms frequency response and ... 1answer 84 views Term for integral multiples of fundamental period? As we know that a signal has fundamental frequency and integral multiples of fundamental frequency are known as harmonics I am curious about the term that will be used for integral multiples of ... 1answer 122 views Phase contribution of complex poles I am struggling with understanding the phase contribution of each individual pole. Let's say we have a system (minimum-phase system if it makes a difference) and it has poles located at: and What is ... 1answer 240 views Nyquist Plot for transfer functions with poles at the origin I'm learning Nyquist plots and something has been seriously bugging me when treating poles or zeros in the origin. Nyquist plots obtains information based on the argument principle which states "If f(... 2answers 38 views MATLAB - How do I get the Filter Function to get the output Energy Spectrum? The image was from a question I posted on reddit, so ignore the title. I'm trying to write a program that plots these graphs I know that the first plot is just a plot of the source-signal so the "... 2answers 728 views Could someone please explain how to get frequency response of a given Bode Plot? Having trouble with bode plots. I understand that the is to be converted to$dB$but after that I'm stuck. Could someone please show me how this graph gives a frequency response of$10/1+jw10$1answer 53 views Discrete Time Fourier Analysis Suppose we're given the following:$ x[n] = 2 + (-1)^n $, and are given the impulse response$ h[n] = u[n] a^n $, of an LTI system where$ |a| < 1$. We're asked to find the output$y[n]$, if$x[n]$... 1answer 70 views Plotting the Phase Response I would appreciate it very much if someone would be able to provide some clarity on plotting phase responses. For instance, given that the frequency response of a filter can be written as H(exp(j*&... 1answer 73 views Fourier Transforms, symmetry, real/imaginary I was hoping to clarify if the following was correct: -a real function (neither even nor odd) in time exhibits conjugate symmetry in frequency, so the real part of the frequency response is even, and ... 1answer 152 views Digital filter design of time series for specified frequency response function I am currently working with vibration measurements in structures. In the netherlands there is a guideline for verifying vibration measurements for damage to machinery. This is the so-called "SBR ... 2answers 86 views finding phase and group delay from frequency response (From Schaum's Outlines, DSP, second edition, problem 5.25, second part of problem) What's the procedure to find the Phase and Group Delay of:$$H(e^{j\omega}) = e^{-j\theta}\left( \frac{e^{-j(\... 1answer 119 views Numerical Calculation of impulse response out of frequency response Currently I work on my Masterthesis which deals with structural dynamic simulation. As a part of it I have to filter a Signal with a FIR-Filter. From that Filter I know the Frequency Response (picture)... 1answer 1k views What exactly is Savitzky-Golay differentiation filter? I could understand Savitzky-Golay filter as being smoothing filter, but then there also seems to be Savitzky-Golay differentiation filter, though for some reason, details do not seem to be clear. So ... 1answer 63 views Sensor rise time compared to experimental step input rise time I have a dynamic calibration system. With it, I am applying a experimental step input to a pressure sensor. The goal is to measure the step response of the sensor and use it to calculate the frequency ... 1answer 54 views Is it wrong to first calculate the whole system's Frequency response and then apply input to it? Having a system like below, which (i think) is LTI, and$H(e^{j\omega}) = \begin{cases} 1 & |\omega|\leq \frac{\pi}{2} \\ 0 & |\omega| \gt \frac{\pi}{2} \end{cases} $I've ... 2answers 131 views Frequency response of numerical differentiation by polynomial interpolation / finite difference One can use polynomial interpolation (or finite difference) to do numerical differentiation. However, there seems to be a surprising lack of interest in obtaining frequency response of this numerical ... 0answers 44 views system identification: MATLAB tfestimate gives different results for different Fs So I have an experimental data; A is a chirp signal (sweep sine wave) and B is the response of the system. I identify the system as follows in MATLAB: ... 1answer 125 views Computation of parameter filter to match a given frequency response I'm looking for the practical way to compute the parameters ($a_1$,$a_2$) of a digital filter to match a certain frequency response. I'm studying the 12-poles filter of the vintage component SP0256 ... 1answer 90 views what happens If I change the phase and magnitude of a signal I have a speech signal. I want to know what happens when I make some changes on the phase of its frequency reaponse. When I set its phase to zero I observed that the new signal is even and the ... 1answer 95 views How to prove these two definitions of the minimum phase transfer function are same? There are so many definitions of the minimum phase transfer function, and these are two of them. The transfer function of the system which has no zeros or poles at right half plane. The transfer ... 1answer 66 views Given a plot of both the magnitude$|H(\omega)|$and its angle, How can you find the$H(\omega)$? I'm specifically trying to use an inverse Fourier Transform to find$h(t)$, but I'm finding it difficult to get$H(\omega)$in the first place. I'm under the impression from my textbook that$H(\...
Take an example of the below plot for an LPF (Source : WikiPedia) The plot starts from $0$. We know that the fourier transform of any signal brings in negative frequencies due to complex exponentials ...