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2014/10/16 ¤W¤È 08:13:51
android Programming Glossary: frequenciesDetermine the audio frequency of sound received via the microphone http://stackoverflow.com/questions/3904488/determine-the-audio-frequency-of-sound-received-via-the-microphone may contain spectral content at a large number of frequencies. Furthermore the frequency spectrum of a note may or may not.. for displaying in graphic form plotted against time the frequencies contained in captured sound with a trade off in time response..
Getting decibel from an android microphone http://stackoverflow.com/questions/4271989/getting-decibel-from-an-android-microphone to estimate the SPL and just hope it's flat enough across frequencies of interest. You then have two choices for how to apply the..
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 sound. Every voice is split into a few distinct ratios of frequencies which all combine to make the voice we hear and every voice's.. . So if you were able to take a sample break it up into frequencies of about 10hz each and watch for the amplitude of each and when.. it Well you would have to look for a pattern in the frequencies that looks like a voice. How do you do that Well to be honest..
Android 2.3 Visualizer - Trouble understanding getFft() http://stackoverflow.com/questions/4720512/android-2-3-visualizer-trouble-understanding-getfft sides of the spectrum refers to the positive and negative frequencies in the output of the FFT. The FFT forces the frequency output.. period of Fs . If you look at the FFT output it covers the frequencies from 0 to Fs. It is often advantageous to view the spectrum.. frequency output will be a mirror image of the positive frequencies. Because of this often only one side of the spectrum is used..
Capturing Sound for Analysis and Visualizing Frequencies in Android http://stackoverflow.com/questions/5511250/capturing-sound-for-analysis-and-visualizing-frequencies-in-android which captures an audio sound and then displays the frequencies that exist within it. I found an example that draws the graphic.. used to break an audio signal down into component frequencies employs a mathematic transformation called a discrete Fourier..
Android audio FFT to retrieve specific frequency magnitude using audiorecord http://stackoverflow.com/questions/5774104/android-audio-fft-to-retrieve-specific-frequency-magnitude-using-audiorecord Most of the magnitudes should be close to zero except the frequencies that have actual values. You need the sampling frequency to.. to convert the array indices to such magnitudes to frequencies private double ComputeFrequency int arrayIndex return 1.0 sampleRate..
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 this question The notes produced 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.. usage of an FFT or other filter bank is a common technique for displaying in graphic form plotted against time the frequencies contained in captured sound with a trade off in time response versus frequency resolution. There's example spectrograph..
Getting decibel from an android microphone http://stackoverflow.com/questions/4271989/getting-decibel-from-an-android-microphone resort you use some known physical property of the source to estimate the SPL and just hope it's flat enough across frequencies of interest. You then have two choices for how to apply the correction. One option is to invert the transfer function calculate..
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 there is a way to detect actual voice as opposed to just sound. Every voice is split into a few distinct ratios of frequencies which all combine to make the voice we hear and every voice's ratios remains pretty constant while each individual voice's.. ratios are different which is why voice based passwords work . So if you were able to take a sample break it up into frequencies of about 10hz each and watch for the amplitude of each and when you got a frequency amplitude pattern that looked similar.. but it wouldn't be as reliable. In conclusion how do you analyze it Well you would have to look for a pattern in the frequencies that looks like a voice. How do you do that Well to be honest I don't know for sure. Sorry. share improve this answer..
Android 2.3 Visualizer - Trouble understanding getFft() http://stackoverflow.com/questions/4720512/android-2-3-visualizer-trouble-understanding-getfft N is the number of samples used to compute the FFT The two sides of the spectrum refers to the positive and negative frequencies in the output of the FFT. The FFT forces the frequency output to be periodic with a period of Fs . If you look at the FFT.. The FFT forces the frequency output to be periodic with a period of Fs . If you look at the FFT output it covers the frequencies from 0 to Fs. It is often advantageous to view the spectrum over the range of 0.5 Fs to 0.5 Fs instead by shifting the FFT.. like the ones you have in audio processing the negative frequency output will be a mirror image of the positive frequencies. Because of this often only one side of the spectrum is used when analyzing real signals. Another important point is the..
Capturing Sound for Analysis and Visualizing Frequencies in Android http://stackoverflow.com/questions/5511250/capturing-sound-for-analysis-and-visualizing-frequencies-in-android in Android I'm new in Android and I'm trying to make a program which captures an audio sound and then displays the frequencies that exist within it. I found an example that draws the graphic portion of a graphic equalizer. In this example it is used.. an object of type AudioRecord to capture audio sound. The technique used to break an audio signal down into component frequencies employs a mathematic transformation called a discrete Fourier transform DFT and to perform DFT it is used a fast Fourier..
Android audio FFT to retrieve specific frequency magnitude using audiorecord http://stackoverflow.com/questions/5774104/android-audio-fft-to-retrieve-specific-frequency-magnitude-using-audiorecord use the magnitudes of the complex numbers in the results. Most of the magnitudes should be close to zero except the frequencies that have actual values. You need the sampling frequency to convert the array indices to such magnitudes to frequencies.. that have actual values. You need the sampling frequency to convert the array indices to such magnitudes to frequencies private double ComputeFrequency int arrayIndex return 1.0 sampleRate 1.0 fftOutWindowSize arrayIndex share improve this..
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