# Questions tagged [signal-analysis]

The processing of signals for the purpose of extracting a parameter or property embedded in a signal. Signal goes in and far fewer numbers come out.

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### Understand carrier power, output power and dBC?

I have a question regarding the concept of carrier power, output power and power relative to carrier (dBc). Suppose I have a carrier frequency of 4Hz and signal bandwidth = 4 Hz. The signal span is ...
140 views

### Calculate a signal of brightness

I am new to signal processing. Currently, I am reading a paper regarding musical expression. The paper calculates brightness, and I want to reproduce their way of computing it. I was wondering if ...
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### Is the magnitude of the phase shift independent of the volume of the sound?

Sound waves can cause vibration of the particles/objects that are scattering/reflecting/emitting the light. Since vibration is spatial displacement, it causes a phase shift by affecting the value of &...
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### How can the FIR filter remove the bias?

I was reading about Finite Impulse Response (FIR) and I read that it can remove the bias (offset) from signals, but I didn't understand how this can be achieved. Can you please help me to understand ...
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### Doubt on Signal Processing Step

I am using a Radar Sensor. So applying Signal Processing on the Radar Sensor Data. PrevSample and PastSample are Radar IQ samples for a present and previous Sweep detecting tiny movement. In the ...
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### Crash course on Sonar

I have some experience in Signal processing and a lot more in solving numerically the electromagnetic field integral equations using Matlab and C++. Now I am curious about the Sonar (e.g., underwater) ...
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### How to explain the meaning of the intersection in a Fourier series representation of periodic signals?

I saw a piece of code on github which transforms the planetary movement into the Fourier wave function. These circles are given by the $x$ and $y$ ordinates: $x=\cos (\omega t)$, $y=\sin (\omega t)$, ...
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### What is the sum $\sum_{m} e^{i (U_m k + \beta_m)}$ when $U$ and $\beta$ follow different distributions

I have the following function. $$x(k) = \sum_{m} e^{i (U_m k + \beta_m)}$$ $i = \sqrt{-1}$ Here, $U_m$ are samples drawn from a Gaussian random distribution. $$U_m \sim \mathcal{N}(\mu, \sigma)$$ ...
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### What is the complexity of big-$O$ $O(N \times \mathrm{log}_2(N))$ vs real operations

I usually see books/references writing the complexity of such operations as $O(N \times \mathrm{log}_2(N))$; For example, the complexity of FFT/IFFT operation is $O(N \times \mathrm{log}_2(N))$. ...
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### What is the relationship among digital filter cutoff frequency, signal frequency and filter settling time?

I have some general observations but I am asking if anyone can summarize more conclusively: (1) Filter settles slower if the ratio between signal frequency and filter cutoff frequency is smaller; (2) ...
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### convert from binary to hexadecimal according to the algorithm "keeloq"

Good afternoon. I have the key to my gate. I received its recording in the form of a PWM pulse train. Instead, I converted the impulses into binary code. Now I should get the hex numbers but it doesn'...
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### In radar pulse analysis, why is the PRF of pulse not calculated using Fourier transform?

So, I am fairly new to this, but when going through books on Radar pulses, I noticed that quite often, a formula describing the frequency of the waveform is given. For example, the frequency of a ...
1 vote
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### Fourier transform of a top-hat function in the Faraday Measurement synthesis context

I'm currently trying to calculate the Fourier transform of a top-hat function in the context of Faraday Measurement Synthesis. This is pretty straightforward, however, I cannot understand why I cannot ...
160 views

### Allan variance and the bias

I was reading about the Allan-variance method and I have a question and I need some help to understand it. Since the Allan is about analyzing the frequency stability and it can characterize the IMU ...
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### IMU data using ble protocol is in a weird format

I am working on IMU data, this data was collected using wrist watch under the protocol BLE the reading are non-interpretable for me: ...
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### How to choose correctly oversampling ratio?

As many of us have noticed, last two months I am working on GMSK modulation and demodulation design. Before continuing my research, I want to be sure I chose the correct oversampling ratio ( how many ...
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### Envelope of a series of pulsed signals [duplicate]

I need to record a series of pulse waves for an experiment. The recording is done via Software Defined Radio (GNU Radio). The pulse waves are modulated in such a way that the amplitudes of each single ...
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### Examples & Applications of Quadratic Phase Coupling

Quadratic phase coupling is defined as follows: Consider the signal $$x(t) = A_{1} \cos(\omega_{1}t+ \phi_{1}) + > A_{2}\cos(\omega_{2}t + \phi_{2})$$ which is passed through the quadratic ...
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### Analysis of two audio signal by autocorrelation

I have recorded my audio by two hardware, PC and Microcontroller, I know the PC result are correct but my signal have some deficit. I have recorded by my PC and MCU my voice 6s 7812Hz and ...
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### localization based on TDOA

To locate a transmitter, I use a localization based on TDOA(Chan's method) with 3 receivers. The results obtained are not effective. What is a possible solution to improve the localization accuracy ...
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### Signal processing in Python vs C++ (band-pass filter)

I have implemented Python signal processing code using a butter bandpass filter and order 3. It is working pretty well. I am required to implement the same signal ...
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### What make sample rate affect QspectrumAnalyzer output?

Use QspectrumAnalyzer to analyze signal,set sample rate as 8M and 32M. I get different output as below,32M sample rate cause ...
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### Interpreting sensor noise data

Introduction :I am trying to create an EKF for an autonomous vehicle, and i need to model the error of the sensors. (I am a mechanical engineer so my knowledge on electric signals is limited). The ...
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### Does tsa function in matlab assume constant rpm in the same rotation?

I just ran the example code, stepped into the tsa function, and saw the line 139: By looking at the code in the red box, it seems that MATLAB assumes constant rpm in the same rotation and evenly ...
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