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2014/10/16 ¤W¤È 08:20:34
android Programming Glossary: noiseFiltering accelerometer data noise http://stackoverflow.com/questions/1638864/filtering-accelerometer-data-noise accelerometer data noise How do I filter noise of the accelerometer data in Android.. accelerometer data noise How do I filter noise of the accelerometer data in Android I would like to create..
Android Accelerometer Profiling http://stackoverflow.com/questions/16392142/android-accelerometer-profiling to perform after data collection so as to remove noise and get the best data for an activity. The main intent of this.. if you're feeding it into something which is sensitive to noise. Instead I'd say that the data is the data and you'll get the.. results if you use mechanisms which aren't sensitive to noise and hence don't need the data to be smoothed. By definition..
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android bin debuggerd Here the Vss and Rss columns are basically noise these are the straight forward address space and RAM usage of..
Playing multiple sounds using SoundManager http://stackoverflow.com/questions/3039078/playing-multiple-sounds-using-soundmanager specified 20 streams. I have many guns and bad guys making noise in my game and each has a very short sound loop 3000ms. Notice..
How to measure GPS signal strength on Android? http://stackoverflow.com/questions/3551697/how-to-measure-gps-signal-strength-on-android via getSatellites ' and each one of those has a signal to noise ratio getSnr . Assuming you mean accuracy try Location.getAccuracy..
Using AudioTrack in Android to play a WAV file http://stackoverflow.com/questions/3925030/using-audiotrack-in-android-to-play-a-wav-file only PRETTY SURE are right I get a few seconds of white noise before the sound seems to resolve itself into something that..
How to calculate distance based on phone acceleration http://stackoverflow.com/questions/4329164/how-to-calculate-distance-based-on-phone-acceleration a lot of tricks people have come up with to minimize this noise using things like Weiner and Kalman filters. Third as you may.. But it means again that in the short run this adds noise to our system. If you use a good perdictive filter like a Kalman..
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 that looked similar to a voice instead of just white noise you'd be in business. DOING that however doesn't seem like it'd..
Playing back sound coming from microphone in real-time http://stackoverflow.com/questions/5728454/playing-back-sound-coming-from-microphone-in-real-time and the application runs although it produces horrible noise. When I play AudioTrack from a file there is no problem with..
android compass seems unreliable http://stackoverflow.com/questions/6256256/android-compass-seems-unreliable is getting better results is that they use a pretty good noise filter on the deprecated orientation sensor why they could not.. most part the reliability is always in question. First the noise generated from the magnetic and orientation sensors are horrible.. proper DSP filtering in place and while that cleans up the noise it does not help with accuracy even the same model of phones..
play an audio file on a voice call http://stackoverflow.com/questions/7042742/play-an-audio-file-on-a-voice-call be to play the audio via speaker with max volume do a noise cancellation and hope for the best. android share improve..
http://stackoverflow.com/questions/7317974/android-mute-unmute-phone disabled so when a call or sms is received it won't make noise unmute phone and restore the volume to the state before muting..
Android accelerometer accuracy (Inertial navigation) http://stackoverflow.com/questions/7829097/android-accelerometer-accuracy-inertial-navigation I highly recommend this video. It is not the accelerometer noise that causes the problem but the gyro white noise see subsection.. noise that causes the problem but the gyro white noise see subsection 6.2.3 Propagation of Errors. By the way you will..
Saving audio input of Android Stock speech recognition engine http://stackoverflow.com/questions/8583406/saving-audio-input-of-android-stock-speech-recognition-engine In fact when I play the wav file only hear strange noise with this parameters short nChannels 2 audio channels int sRate.. so its hard to diagnose but if you are hearing strange noises then it looks most likely you have the wrong endian when you..
Filtering accelerometer data noise http://stackoverflow.com/questions/1638864/filtering-accelerometer-data-noise accelerometer data noise How do I filter noise of the accelerometer data in Android I would like to create a high pass filter for my sample data.. accelerometer data noise How do I filter noise of the accelerometer data in Android I would like to create a high pass filter for my sample data so that I could eliminate..
Android Accelerometer Profiling http://stackoverflow.com/questions/16392142/android-accelerometer-profiling activity profile. Would like to have suggestions on what operations to perform after data collection so as to remove noise and get the best data for an activity. The main intent of this data collection is to construct a user activity detection.. of the device orientation. You only need to smooth the data if you're feeding it into something which is sensitive to noise. Instead I'd say that the data is the data and you'll get the best results if you use mechanisms which aren't sensitive.. I'd say that the data is the data and you'll get the best results if you use mechanisms which aren't sensitive to noise and hence don't need the data to be smoothed. By definition smoothing is discarding data. You want to design an algorithm..
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android 74K 68K system bin servicemanager 54 256K 252K 69K 64K system bin debuggerd Here the Vss and Rss columns are basically noise these are the straight forward address space and RAM usage of a process where if you add up the RAM usage across processes..
Playing multiple sounds using SoundManager http://stackoverflow.com/questions/3039078/playing-multiple-sounds-using-soundmanager know that. In the declaration of SoundPool notice that I specified 20 streams. I have many guns and bad guys making noise in my game and each has a very short sound loop 3000ms. Notice when I add a sound below I keep track of the specified index..
How to measure GPS signal strength on Android? http://stackoverflow.com/questions/3551697/how-to-measure-gps-signal-strength-on-android
Using AudioTrack in Android to play a WAV file http://stackoverflow.com/questions/3925030/using-audiotrack-in-android-to-play-a-wav-file to be a problem but when I play the file with parameters I'm only PRETTY SURE are right I get a few seconds of white noise before the sound seems to resolve itself into something that just may be right. I have successfully recorded and played..
How to calculate distance based on phone acceleration http://stackoverflow.com/questions/4329164/how-to-calculate-distance-based-on-phone-acceleration run it means your reading is going to be noisy. There are a lot of tricks people have come up with to minimize this noise using things like Weiner and Kalman filters. Third as you may have noticed the accelerometer reading is not constant. I.. movements or vibrations and our formula is again still correct. But it means again that in the short run this adds noise to our system. If you use a good perdictive filter like a Kalman filter then it should be able to account for this but weaker..
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 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 like it'd be easy at all. Something similar has been done before with..
Playing back sound coming from microphone in real-time http://stackoverflow.com/questions/5728454/playing-back-sound-coming-from-microphone-in-real-time 8 bits instead of 16 it doesn't throw the exception anymore and the application runs although it produces horrible noise. When I play AudioTrack from a file there is no problem with the initialization of the AudioTrack I tried 44100 and 16 bits..
android compass seems unreliable http://stackoverflow.com/questions/6256256/android-compass-seems-unreliable God help them. The reason the author probably thinks he is getting better results is that they use a pretty good noise filter on the deprecated orientation sensor why they could not do this on the newer method is beyond me and in limited testing.. in the field using many devices I have found that for the most part the reliability is always in question. First the noise generated from the magnetic and orientation sensors are horrible yes this can be overcome with proper DSP techniques and.. outputs. Second I have tested at least 18 phones with proper DSP filtering in place and while that cleans up the noise it does not help with accuracy even the same model of phones have different outputs though some models seem better than..
play an audio file on a voice call http://stackoverflow.com/questions/7042742/play-an-audio-file-on-a-voice-call work around it. For example this time the easiest solution would be to play the audio via speaker with max volume do a noise cancellation and hope for the best. android share improve this question From the official documentation Note You can..
http://stackoverflow.com/questions/7317974/android-mute-unmute-phone 2 operations mute phone possibly with vibrations enabled disabled so when a call or sms is received it won't make noise unmute phone and restore the volume to the state before muting phone How can I do this What permissions are required in..
Android accelerometer accuracy (Inertial navigation) http://stackoverflow.com/questions/7829097/android-accelerometer-accuracy-inertial-navigation Here is an explanation why Google Tech Talk at 23 20 . I highly recommend this video. It is not the accelerometer noise that causes the problem but the gyro white noise see subsection 6.2.3 Propagation of Errors. By the way you will need the.. at 23 20 . I highly recommend this video. It is not the accelerometer noise that causes the problem but the gyro white noise see subsection 6.2.3 Propagation of Errors. By the way you will need the gyroscopes too. As for indoor positioning I have..
Saving audio input of Android Stock speech recognition engine http://stackoverflow.com/questions/8583406/saving-audio-input-of-android-stock-speech-recognition-engine get appropriate audio settings to save in the wav file's headers. In fact when I play the wav file only hear strange noise with this parameters short nChannels 2 audio channels int sRate 44100 Sample rate short bSamples 16 byteSample or nothing.. included your code for actually writing out the PCM data so its hard to diagnose but if you are hearing strange noises then it looks most likely you have the wrong endian when you are writing the data or the wrong number of channels. Getting..
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