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2014/10/16 ¤W¤È 08:09:42
android Programming Glossary: amplitudePlaying an arbitrary tone with Android http://stackoverflow.com/questions/2413426/playing-an-arbitrary-tone-with-android int idx 0 for final double dVal sample scale to maximum amplitude final short val short dVal 32767 in 16 bit wav PCM first byte..
How do I get the current volume/amplitude in an Android MediaPlayer? http://stackoverflow.com/questions/2924676/how-do-i-get-the-current-volume-amplitude-in-an-android-mediaplayer do I get the current volume amplitude in an Android MediaPlayer I'm working on an app that will both.. has an EQ component that animates relative to the current amplitude of the recording. I've got the animation working via the MediaRecorder.getMaxAmplitude..
Getting decibel from an android microphone http://stackoverflow.com/questions/4271989/getting-decibel-from-an-android-microphone source of controlled known spl and recording the resulting amplitude vs frequency which if you sweep slowly is essentially the same.. which if you sweep slowly is essentially the same as amplitude vs. time or you'd hit it with a wideband pseudo impulse such..
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 up into frequencies of about 10hz each and watch for the amplitude of each and when you got a frequency amplitude pattern that.. for the amplitude of each and when you got a frequency amplitude pattern that looked similar to a voice instead of just white..
Android: sample microphone without recording to get live amplitude/level? http://stackoverflow.com/questions/4777060/android-sample-microphone-without-recording-to-get-live-amplitude-level sample microphone without recording to get live amplitude level I was trying to get the amplitude level of a microphone.. to get live amplitude level I was trying to get the amplitude level of a microphone on Android like so MediaRecorder recorder.. recorder public void run Log.v MicInfoService amplitude recorder.getMaxAmplitude Unfortunately this only returns 0..
http://stackoverflow.com/questions/5890499/pcm-audio-amplitude-values audio amplitude values I am starting out with audio recording using my Android.. graph like the one below. However I do not understand the amplitude values along the y axis. What exactly are the units for the.. along the y axis. What exactly are the units for the amplitude values The values are signed 16 bit so they must range from..
Calculate Decibel from amplitude - Android media recorder http://stackoverflow.com/questions/6571894/calculate-decibel-from-amplitude-android-media-recorder Decibel from amplitude Android media recorder How to calculate decibel from maxAmplitude.. relative to some reference power. If you are working with amplitudes then the formula is power_db 20 log10 amp amp_ref See http.. wiki Decibel#Field_quantities . Note also that maximum amplitude is not usually a very good indicator of loudness or even of..
Playing an arbitrary tone with Android http://stackoverflow.com/questions/2413426/playing-an-arbitrary-tone-with-android bit pcm sound array assumes the sample buffer is normalised. int idx 0 for final double dVal sample scale to maximum amplitude final short val short dVal 32767 in 16 bit wav PCM first byte is the low order byte generatedSnd idx byte val 0x00ff generatedSnd..
How do I get the current volume/amplitude in an Android MediaPlayer? http://stackoverflow.com/questions/2924676/how-do-i-get-the-current-volume-amplitude-in-an-android-mediaplayer do I get the current volume amplitude in an Android MediaPlayer I'm working on an app that will both record an audio file and then have the option to play back.. to play back that file once it's been recorded. The UI has an EQ component that animates relative to the current amplitude of the recording. I've got the animation working via the MediaRecorder.getMaxAmplitude method but can't find any means to..
Getting decibel from an android microphone http://stackoverflow.com/questions/4271989/getting-decibel-from-an-android-microphone measurements for example frequency sweeping a lab source of controlled known spl and recording the resulting amplitude vs frequency which if you sweep slowly is essentially the same as amplitude vs. time or you'd hit it with a wideband pseudo.. known spl and recording the resulting amplitude vs frequency which if you sweep slowly is essentially the same as amplitude vs. time or you'd hit it with a wideband pseudo impulse such as an electric spark starter pistol whatever that you are also..
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 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 to a voice instead of just white noise you'd.. 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 to a voice instead of just white noise you'd be in business. DOING that however doesn't seem..
Android: sample microphone without recording to get live amplitude/level? http://stackoverflow.com/questions/4777060/android-sample-microphone-without-recording-to-get-live-amplitude-level sample microphone without recording to get live amplitude level I was trying to get the amplitude level of a microphone on Android like so MediaRecorder recorder new MediaRecorder.. sample microphone without recording to get live amplitude level I was trying to get the amplitude level of a microphone on Android like so MediaRecorder recorder new MediaRecorder recorder.setAudioSource MediaRecorder.AudioSource.MIC.. recorder public RecorderTask MediaRecorder recorder this.recorder recorder public void run Log.v MicInfoService amplitude recorder.getMaxAmplitude Unfortunately this only returns 0 all the time. It appears that for this to work I have to actually..
http://stackoverflow.com/questions/5890499/pcm-audio-amplitude-values audio amplitude values I am starting out with audio recording using my Android smartphone. I successfully saved voice recordings to a PCM.. data and print out the signed 16 bit values I can create a graph like the one below. However I do not understand the amplitude values along the y axis. What exactly are the units for the amplitude values The values are signed 16 bit so they must range.. the one below. However I do not understand the amplitude values along the y axis. What exactly are the units for the amplitude values The values are signed 16 bit so they must range from 32K to 32K. But what do these values represent Decibels If I..
Calculate Decibel from amplitude - Android media recorder http://stackoverflow.com/questions/6571894/calculate-decibel-from-amplitude-android-media-recorder Decibel from amplitude Android media recorder How to calculate decibel from maxAmplitude I wrote an android application to get maxAmplitude at.. are a relative unit they express the power of your signal relative to some reference power. If you are working with amplitudes then the formula is power_db 20 log10 amp amp_ref See http en.wikipedia.org wiki Decibel#Field_quantities . Note also that.. is power_db 20 log10 amp amp_ref See http en.wikipedia.org wiki Decibel#Field_quantities . Note also that maximum amplitude is not usually a very good indicator of loudness or even of power . More typically you should measure the RMS power of your..
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