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Questions tagged [amplitude]

The amplitude of a periodic variable is a measure of its change over a single period

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How to reduce amplitudes array size in Java?

Searching the web for weeks i came to the following code for calculating the amplitudes of a given .wav file in Java . Now the problem is it doesn't scale well at all with big audio files like let's say 30 minutes , the produces array is…
GOXR3PLUS
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Track amplitude sound of an ios device

does someone knows a ios framework to track amplitude sound of a ios device. We need to do action when aplitude reach a level defined.
Shower Timer
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Converting audible sound to ultrasonic

I have sound clips that are about 3-4 seconds in human audible range. I want to convert them into ultrasonic range so that when I transmit them they are not audible to humans. I read that I need to use amplitude modulation. I used the modulate…
krish
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Add a row to a dataframe showing amplitude (max of the sum of the positive or the negative values)

I'd like to insert a last row to a dataframe that would show either the sum of the positive values or the sum of the negative value per column, whichever sum has the greatest amplitude. The final table would look like this with the last row…
user8453031
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Matlab: How to find frequency, amplitude and phase of a sinusoidal function with linerary increasing frequency and phase?

I am trying to calculate amplitude and frequency modulation, as well as phase, of a sinusoidal function. The function is decribed as follows: fs = 128; x1 = 1/fs:1/fs:1; A1 = 50*x1; B1 = 10*x1; C1 = 1; D1 = 1; y1 = D1 + A1.*sin(C1 + B1.*x1); As a…
Kamil Górecki
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Average amplitude of pulse oximetery signal using MATLAB

I need the average amplitude and the rate of the signal that I recorded from the surface of the body. I wrote the code below but I don't know whether it is really correct. x=shbo2(1:600); %signal psdest =…
Julliette
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Why doesn't the choice of normalization convention matter for 2D discrete fourier transforms

I am trying to produce a power spectrum for a 2D image. I understand how the choice of normalization convention doesn't matter if you're forward transforming and then inverse transforming so long as the product of both normalization constants is…
Steve
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swift FFT chunk audio file to get Amplitude

i need your help. in want to use the FFT on my audio file. i want to cut my audio file in more little buffer array and use my FFT with all sub buffer. why ?? because i need to know and see (with plot data) how my fréquence have particularity. i…
Cyril Jeanneret
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computing hourly amplitude from coordinate time series

I have a coordinate time series for 2 hours and 1 second interval (observation=7200). How can I compute the hourly amplitude from this data?
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How can I change the frequency and amplitude at the same time?

For example, if I need to set the frequency of 100 Hertz, I used the tone function to set the frequency using PWM. Now I need to vary the amplitude between 0 - 5 Volts using PWM. Is it possible to use tone and analogWrite together to fix frequency…
j.dave
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How to change the amplitude of pulsetrain of rectangular pulses in Matlab

I am plotting a pulsetrain of rectangular pulses. pulse_periods = [0:128]*period; %128 pps %works for Ampl. default = 1, r1 = pulstran(t,pulse_periods,'rectpuls', w); This gives a default amplitude of 1 for the rectangular pulses. I need to…
AAI
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Voice Activity Detection in Android

I am writing an application that will behave similar to the existing Voice recognition but will be sending the sound data to a proprietary web service to perform the speech recognition part. I am using the standard MediaRecord (which is AMR-NB…
Eliseo
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What is the meaning/scale for the amplitude in a Numpy FFT?

To the best of my knowledge, the amplitude in an FFT is 10 times its corresponding frequency. For example, if you were to take the FFT of sin(t) from 0 to 2*pi, the FFT would peak at a frequency of .159 Hz and have a corresponding amplitude of 1.59.…
Bobby Stiller
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Numpy FFT issue when shifting data along vertical axis

I want to find the relationship between the y-axis of my data and the vertical axis of my FFT (amplitude). To do this I am testing how the amplitude of my FFT changes when I change the y-axis of my data. For example, I plotted sin(t) from 0 to 2*pi…
Bobby Stiller
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How can I get the Resonant Frequencies (Bode plot)? (Response of 2-DOF System)

I want to study the response of the system. I want to find the resonant frequency of the sprung mass (m1) and the resonant frequency of the unsprung mass (m2). Because I am not sure if I have understood the meaning of resonant. Let's say that we…
Bob
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