Questions tagged [amplitude]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
-1 votes
1 answer
53 views

Adjusting pulse amplitude against fixed noise variance to achieve a given Eb/No

Given a short duration pulse of $n$ samples out of a frame of $L$ samples, and amplitude of each of these samples being $A$, and an AWGN channel with variance $\sigma ^{2} = 1$, how can I derive $A$ ...
user avatar
  • 1
15 votes
4 answers
2k views

When concatenating sine waves, how do I phase shift in order to prevent "pops" caused by sudden jumps in amplitude?

I'm writing a synthesizer using numpy and python. I've run into a problem where concatenating sine waves causes 'pops' or 'clicks' when they are outputted to audio, say, via ...
user avatar
  • 151
0 votes
1 answer
28 views

How to modify spectrograms so that there is no effect of amplitude on their classification?

Is there any way to bring different classes of spectrograms to comparable amplitude levels so that when they are used for classification, the deep learning algorithm focuses on other aspects (like the ...
user avatar
  • 63
0 votes
0 answers
25 views

What can I do to improve the sound of a signal?

I want to improve the sound of my signal, I know I can do it by increasing or decreasing the amplitude of the signal itself. Are there any other ways to do this? How can I apply the Fourier transform ...
user avatar
0 votes
1 answer
46 views

How to compute data imbalance?

I have to compare amplitudes of two signal ("ideal " signal and "estimated" signal) and want to compute an amplitude imbalance For my calculation I used the following equation: $$ ...
user avatar
0 votes
1 answer
23 views

Does different frequency signal cause different voltage from antenna?

When antenna received signal,antenna generate voltage,then SDR convert voltage to I=amplitude*cos(t)and I=amplitude*sin(t). When ...
user avatar
  • 175
2 votes
1 answer
85 views

Decrease of the signal amplitude and oscillation in the output of FIR filter (windowing method)

In order to truncate my signal in the frequency domain, I am applying a low pass filter with the windowing method. As a test, I chose the Hamming window. What is the cause of the oscillation at the ...
user avatar
  • 53
1 vote
3 answers
99 views

Is digital necessarily discrete in both amplitude and time?

Is digital necessarily discrete in both amplitude and time? Or rather it is necessarily discrete only in time (but not necessarily in amplitude)?
user avatar
  • 23
0 votes
0 answers
69 views

Should I use IQ data or power data to compare 2 signals through `similaritymeasures.dtw`?

I choose similaritymeasures.dtw to compare experiment signal exp_sig and reference signal ref_sig. Both signals are I,Q data ...
user avatar
  • 175
0 votes
2 answers
83 views

How do you find a specific frequency's volume corresponding to that signal's FFT?

I've been dabbling in FFT for awhile now and I came across a problem: We have a signal comprised of two different frequencies A and B. Frequency A is much louder than frequency B; frequency A's ...
user avatar
0 votes
0 answers
91 views

Extract amplitude values from a wav file

I would like to extract the amplitude value from a wav file. Using Python I can extract the raw data into an array. How do I go about extracting the amplitude value of each sample?
user avatar
1 vote
1 answer
30 views

0/1 dB normalization using clamp function

I would like to perform dB normalization on audio data to make less loud sound louder and to make unusually loud sound less loud, before feeding them into neural networks. I came across this function: ...
user avatar
  • 45
0 votes
1 answer
99 views

Why does adding a high-pass or low-pass EQ increase volume?

The following three screenshots show the max volume levels (indicated above the VU meter) of Cuckoo by Tipper if played with: No EQ: -0.5db Headroom High Pass EQ: +2.5dB over Low Pass EQ: +0.4dB ...
user avatar
  • 275
2 votes
4 answers
131 views

50Hz sine wave precise amplitude measurement

I have a 50Hz sine wave(mains voltage divided to the full-scale voltage of the ADC) sampled at 4kHz with not much noise in it. I want to measure precisely the peak-peak voltage of the sine. My first ...
user avatar
1 vote
1 answer
45 views

how make an equation of a procedure?

Good day to everyone, i have frequency spectrum i selected top 10 peaks of that spectrum i give weightage from 1 to 10 to top 10 frequencies by multiplying the corresponding amplitude by weightage ...
user avatar
1 vote
1 answer
34 views

FInd the amplitude function to a system

I'm studying a course in signal analysis and have come across an exercise where I find the analytical part a bit tricky. I am to find the amplitude function $|H( f )|$ for a system with the impulse ...
user avatar
  • 53
1 vote
1 answer
38 views

Amplitude-and phasefunctions for a system

I am studying a course in signalanalysis and have run into som trouble with a exercise. I am to dimension the circuit below in such a way that the DC-amplification is 1 and that the frequencies $\...
user avatar
  • 53
0 votes
1 answer
68 views

Can FFT tells us existance of same frequencies with different phases?

So I know that applying FFT on a time-domain signal, shows which frequency components exists and what amplitudes each frequency signal has. My question is, suppose the signal contains same frequency ...
user avatar
  • 149
0 votes
1 answer
54 views

Calculating power of brain signals

I have a dataset that contains EEG (or MEG) recordings of brain signals during some cognitive tasks. Each row, shows the source estimates of neurons in a particular region. source estimate contains ...
user avatar
  • 149
1 vote
1 answer
126 views

How is sampling affecting this sine wave?

I am trying to create a sine wave in python, but when I graph it, it looks like this: here is the code I used to make the signal: ...
user avatar
1 vote
1 answer
133 views

Bandpass filter equivalent for amplitude

I have a signal where I am using a bandpass filter to limit the frequency range. I am also interested in filtering the remaining frequencies (after bandpass filtering) within the signal by their ...
user avatar
  • 115
0 votes
1 answer
86 views

Fine frequency correction : grouping and finding max amplitude inside a group

I work on phase and frequency estimation algorithm. Currently I am working on a derivation and determination of the Doppler shift( dF – frequency step). For each dF, The following algorithm was ...
user avatar
0 votes
1 answer
45 views

Amplitude / gain of difference of 2 known FIR low-pass filters

Given a discretely sampled sinusoidal signal (frequency $1/40$), and 2 Simple Moving Averages (SMA), better known as FIR low-pass filters of order e.g. $10$ and $21$, it can easily be calculated what ...
user avatar
  • 307
0 votes
1 answer
34 views

RMS Amplitudes of voltage

I am looking here at the course of current fluctuations and have calculated the RMS values, but somehow it seems strange to me: with the black line there are small fluctuations, but the RMS value is ...
user avatar
  • 13
0 votes
0 answers
53 views

Emulating tape distortion of low-level audio signals

I'm working on a tape echo emulation in Reaktor, and I've based the frequency response, tape speed warble, high-amplitude saturation and tape hiss on a paper I found about the Roland Space Echo. ...
user avatar
3 votes
4 answers
372 views

Amplitude of the fft is less than what is expected

This is my MATLAB code ...
user avatar
  • 91
1 vote
1 answer
490 views

How to obtain the exact value of wavelength from a 2D FFT amplitude vs wavenumber plot like it is obtainable from 1D FFT amplitude vs wavenumber plot?

I have a two dimensional multi modal spatial signal generated from a MATLAB code using sinusoidal functions of different wave numbers, amplitudes and phases. What I want to know is that if I have the ...
user avatar
0 votes
1 answer
70 views

Amplitude decrease in FFT at higher frequency for multisine

I am adding sine signals with different frequencies but same amplitude=100. Sampling frequency is 50MHz. I am not getting 100 in frequency domain for frequency 787KHz. At 1K, 3K I am getting 100 ...
user avatar
1 vote
1 answer
241 views

How to compute correct phase in FFT even after applying phase unwrap and zeroing round off error?

I am converting a time-domain synthetic 1D signal to frequency domain using MATLAB fft. In the frequency domain, the amplitude vs frequency plot is coming reasonable which means it is showing the ...
user avatar
0 votes
2 answers
182 views

Amplitude spectrum (transfer function) of signal?

I have one question related to finding amplitude spectrum (transfer function) of signal knowing that output signal is time derivative of input signal. I have the answer graph but I don't understand ...
user avatar
-1 votes
1 answer
237 views

What is the x and y axis showing for this matplotlib.pyplot histogram of a .wav file?

The python code below generates a histogram from a .wav file, but what exactly does the histogram show? Is the x axis amplitude binned by sampling rate? Is the y axis a count of how many samples are ...
user avatar
0 votes
0 answers
157 views

Instantaneous amplitude of a constant frequency sine wave?

I am playing around with the Hilbert transform using Python's scipy.signal.hilbert package to better understand what the various instantaneous properties are given different input signals. One input ...
user avatar
-1 votes
1 answer
60 views

Discussion of simulation results of a signal sequence: amplitude

I need your help in understanding if the simulation result is correct. I have simulated a random BPSK sequence that was upsampled and filtered with a raised cosine filter. The length of the filter is ...
user avatar
  • 69
1 vote
1 answer
111 views

Calculating transmitter power from spectral density

I want to find out what is the real transmit power of my USRP 2922, unfortunately the only results I get when looking at the spectrum analyzer is the spectral power density. These are the results of ...
user avatar
0 votes
1 answer
62 views

What equation predicts the amplitudes of harmonics from a square/triangle/sawtooth/pulse oscillator?

I have seen pictures like this which depict the shapes of amplitudes from the various common types of audio oscillators: Similar pictures of spectra are shown here. I am attempting recreating these ...
user avatar
  • 427
0 votes
1 answer
44 views

Is there an equation that will graph the shape or predict the maximum amplitude of a single sample impulse fed through a One-Pole LPF?

If you feed a single sample impulse of a given amplitude through a One-Pole LPF you get an envelope that looks like this: The output of the LPF from its peak will settle into an exponential decay ...
user avatar
  • 427
0 votes
1 answer
84 views

How to describe voltage fluctuations

I am looking for a way to describe the properties of voltage fluctuations - is the RMS amplitude a suitable measure? Attached is a screenshot showing the random current fluctuations (in the case of ...
user avatar
  • 13
0 votes
1 answer
66 views

Find which signal was transferred in 32QAM

I've been assigned to solve a problem for 32QAM signals. The thing is, there are little to none sources in my native language to get any decent information on the topic. The problem is (in its ...
user avatar
  • 103
0 votes
2 answers
114 views

How to quantify amplitude of oscillations in marginally stable systems?

Transfer function pole on the Imaginary axis indicates that the system is marginally stable which in time domain can be represented as a sinusoidal motion with constant amplitude and frequency of the ...
user avatar
  • 1
0 votes
1 answer
127 views

Relationship between amplitude and sampling rate

I'm loading a signal with librosa in python. With the original sample rate of 22050 Hz, i get the following waveplot: When i choose to resample my signal with the sample rate of 512 Hz, i get the ...
user avatar
0 votes
2 answers
1k views

Amplitude modulation vs sampling rate?

As a sampled tone's frequency nears $f_s / 2$, amplitude modulation grows apparent: ("Actual" curve in grey; blue is what we get if taking samples (dots) "at face value"). This is ...
user avatar
1 vote
0 answers
148 views

(Newbie question) Calculation DC-offset and RMS

Being a newbie on this topic I beg you to be indulgent to me if my questions should be kind of "too" simple ;-) For doing automatic analysis on my audio material I started calculating the ...
user avatar
  • 87
-1 votes
1 answer
405 views

Why the bandwidth in frequency spectrum of AM wave is 2fm and not 2fc?

We know, the instantaneous voltage of AM wave is: ...
user avatar
  • 121
-2 votes
1 answer
190 views

How do decibels scale with wave amplitude?

I know the decibel scale is logarithmic in nature. Given that at 1V amplitude the power of the sound generated by this wave is 80dB, what would the dB be for the wave with amplitude 0.4V? I'm trying ...
user avatar
0 votes
1 answer
94 views

why does the additive synthesis method for a triangle wave require amplitude scaling by 8/pi^2?

I had to make a bunch of band limited digital triangle waves recently, so I went to (where else) wikipedia for the equations. I noticed that there is a constant amplitude scalar of ...
user avatar
  • 163
0 votes
0 answers
398 views

RMS of signal vs average amplitude

I am trying to estimate the average amplitude of some signal with frequency 6 Hz, sampled at ~300 Hz. See figures for a part of the signal and its dft calculated using matlab. I estimate the average ...
user avatar
  • 101
0 votes
0 answers
19 views

Equalization of ultrasonic transducer [duplicate]

I am working with ultrasonic transducers with frequencies 100 kHz, one for transmission one for reception. The transmitted signals are chirps. I would like to measure the time of flight between ...
user avatar
0 votes
0 answers
32 views

modulation depth

When a value for the power dissipated by an AM signal is given, and the depth of modulation is also given. Then you are told to find the modulation depth required to increase the power to a higher ...
user avatar
-1 votes
2 answers
207 views

Minimum value of G (Amplitude) that guarantees an error probability of at least $10^{-2}$ in a 32-PAM transmission system

pretty much new here. This question comes from an Online course quiz which i have already completed but cant seem to get a good sleep over, just because i cant figure it out. Below is the question ...
user avatar
1 vote
1 answer
965 views

What is the step response curve of a second order low pass filter? And what if it is set for resonance?

I am doing a lot of audio synthesis DSP where I need to use low pass filters to shape the decay of an impulse. I understand that a one pole filter fed a discontinuity, say from a steady state of 1's ...
user avatar
  • 427