2014/10/16 上午 08:24:48

android Programming Glossary: spectrum

http://stackoverflow.com/questions/3175774/perceptual-similarity-between-two-audio-sequences

file to extract features such as pitch over time frequency spectrum autocorrelation dynamic range transients etc. Put all the features..

Determine the audio frequency of sound received via the microphone

http://stackoverflow.com/questions/3904488/determine-the-audio-frequency-of-sound-received-via-the-microphone

a large number of frequencies. Furthermore the frequency spectrum of a note may or may not contain significant peaks at what a..

Getting decibel from an android microphone

http://stackoverflow.com/questions/4271989/getting-decibel-from-an-android-microphone

can do an FFT on the input data to generate a frequency spectrum and multiply that by the inverse of your frequency response..

Detect the beginning of a sound or voice in Android

http://stackoverflow.com/questions/4659726/detect-the-beginning-of-a-sound-or-voice-in-android

with the app called SpectralView which displays the audio spectrum all broken up. Also as you can see by using the Voice Search..

Android 2.3 Visualizer - Trouble understanding getFft()

http://stackoverflow.com/questions/4720512/android-2-3-visualizer-trouble-understanding-getfft

half of the specified capture size but both sides of the spectrum are returned yielding in a number of bytes equal to the capture.. the capture size. First of all what does both sides of the spectrum mean How does this output differ from a standard FFT Here is.. the output should be from 0 to N just on both sides of the spectrum. So I should be able to take the data from output.length 1 2..

How to get frequency from fft result?

http://stackoverflow.com/questions/7674877/how-to-get-frequency-from-fft-result

are at index 2 i 1 . To get the magnitude of the spectrum at index i you want re fft 2 i im fft 2 i 1 magnitude i sqrt.. you can plot magnitude i for i 0 to N 2 to get the power spectrum. Depending on the nature of your audio input you should see.. your audio input you should see one or more peaks in the spectrum. To get the approximate frequency of any given peak you can..

http://stackoverflow.com/questions/3175774/perceptual-similarity-between-two-audio-sequences

is to Run several bits of signal processing on each audio file to extract features such as pitch over time frequency spectrum autocorrelation dynamic range transients etc. Put all the features for each audio file into a multi dimensional array and..

Determine the audio frequency of sound received via the microphone

http://stackoverflow.com/questions/3904488/determine-the-audio-frequency-of-sound-received-via-the-microphone

by most musical instruments may contain spectral content at a large number of frequencies. Furthermore the frequency spectrum of a note may or may not contain significant peaks at what a human would call the musical pitch of the note. So you may..

Getting decibel from an android microphone

http://stackoverflow.com/questions/4271989/getting-decibel-from-an-android-microphone

of the result per unit time to determine wideband spl. Or you can do an FFT on the input data to generate a frequency spectrum and multiply that by the inverse of your frequency response and take the log magnitude of whatever sum of bin s is interesting...

Detect the beginning of a sound or voice in Android

http://stackoverflow.com/questions/4659726/detect-the-beginning-of-a-sound-or-voice-in-android

it'd be easy at all. Something similar has been done before with the app called SpectralView which displays the audio spectrum all broken up. Also as you can see by using the Voice Search a voice also fluctuates a lot in how loud it is. You could..

Android 2.3 Visualizer - Trouble understanding getFft()

http://stackoverflow.com/questions/4720512/android-2-3-visualizer-trouble-understanding-getfft

is a 8 bit magnitude FFT. Note that the size of the FFT is half of the specified capture size but both sides of the spectrum are returned yielding in a number of bytes equal to the capture size. First of all what does both sides of the spectrum.. are returned yielding in a number of bytes equal to the capture size. First of all what does both sides of the spectrum mean How does this output differ from a standard FFT Here is some sample output of the byte array getFft was given 124 points.. don't see any mirrored data. Google seems to indicate that the output should be from 0 to N just on both sides of the spectrum. So I should be able to take the data from output.length 1 2 to output.length 1. The negative amplitudes are moving faster..

How to get frequency from fft result?

http://stackoverflow.com/questions/7674877/how-to-get-frequency-from-fft-result

i.e. the real components are at index 2 i the imaginary components are at index 2 i 1 . To get the magnitude of the spectrum at index i you want re fft 2 i im fft 2 i 1 magnitude i sqrt re re im im Then you can plot magnitude i for i 0 to N 2 to.. re fft 2 i im fft 2 i 1 magnitude i sqrt re re im im Then you can plot magnitude i for i 0 to N 2 to get the power spectrum. Depending on the nature of your audio input you should see one or more peaks in the spectrum. To get the approximate frequency.. to N 2 to get the power spectrum. Depending on the nature of your audio input you should see one or more peaks in the spectrum. To get the approximate frequency of any given peak you can convert the index of the peak as follows freq i Fs N where freq..