Android :: Audio Programming / Sound Processing And DSP
Jun 23, 2010
The application allowed its users to control the volume of the artist; even mute it.How is this possible?Does adjusting artist sound/setting equalizer etc. mean performing some transformation of required frequencies? What sort of mathematics is required here(frequency domain transformations)?The application recorded users voice input via a mic. Assuming that the sound is recorded in some format, the application was able to mix the recording with the karaoke track(with artists voice muted). How can this be done?Did they play both the track and voice recording simultaneously? Or maybe they inserted additional frequency(channel?) in the original track, maybe replaced it?What sort of DSP is involved here? Is this possible in Java, Objective C?
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Apr 10, 2009
I want to develop an app that lets one intercept raw audio data sent for playback (possibly by a different app), and apply audio enhancements over this raw data.Does Cupcake allow such filtering of audio data? If so, which API should I use? I understand this may not be possible at an application level for security reasons.I'm trying to see if this is possible with native code linking to public or private API of Android.
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Feb 13, 2010
I'm trying to figure out how to write an app that can decode audio morse code on the fly. I found this document which explains how to record audio from the microphone in Android. What I'd like to know is whether it's possible to access the raw input from the microphone or whether it has to be written/read to a file.
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May 19, 2010
I want to merge a sound file and a video file (remove the sound from the video file and replace it with my own sound) and this should happen on the phone.I have done this through ffmpeg, but I can't do that now.Any help appreciated,
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Mar 8, 2010
Is it only possible for one object to access the microphone at a time? That is, could I simultaneously use an AudioRecord to do some audio processing and use a MediaRecorder to record the incoming audio?
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Jun 25, 2010
I am mostly a business programmer and I've not done anything in audio programming since the ZX Spectrum so I'm not sure how to even ask this question correctly.I just need some pointers in the right direction with regards to writing (Android in this case, but it is really a general question) applications which deal with audio such as a Tone Matrix.
Are they based on generating lots of samples or are the tones generated on the fly?
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Dec 24, 2009
I have made apps for the iPhone, but want to also code for the Android but want to know if it is first worth my time, second worth my having to learn another language, and third worth the effort in the sense that am I going to make a profit from this. Also if in any way Android code is similar, then will it be hard to bring the iPhone (Xcode) files, or copy and paste my iPhone code into the Android code.
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Oct 16, 2010
Hey, I have a problem with android programing when I try to record and then play the file that was just recored. I can both record and play the sound but the quality stinks. Its not just bad is really hard to listen to and sound abit like its a computer generated voice. I use the andriod SDK-emulator. The code that sets up the recording looks like this;
MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(path);
recorder.prepare();
recorder.start();
And the code playing the file later looks like this;
MediaPlayer mp = new MediaPlayer(); mp.reset();
mp.setDataSource(path); mp.prepare(); mp.start();
I don't know what part that makes the audio file sound really bad or if its just the emulator that makes it bad and that it would work on a real phone.
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Dec 14, 2009
I'm using the SoundPool to play a series of small audio clips and am having issues with the audio when it starts. I have the audio attached to a button press. When I press the button mulitple times the tick persists. I was wondering if this was the audio file itself or is there something I need to do differently with the SoundPool other than play simply play the clip. These are .ogg files I created using Audacity. When I play them in my dekstop media player, they sound fine.
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Dec 28, 2009
I am creating an android app that basically records an applies an "Effect" on the audio track then plays it back. I got my app to record an play back but I am stuck an not sure where do go from here. I have been Googling for days now trying to find a open source audio library or some way to change the audio after I record it. I currently have it setup to play back using SoundPool an I't lets me speed up an slow down the audio. I would like to do things like change pitch an add echo etc. I will appreciate any responses because I am totally stumped right now.
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Oct 11, 2010
I am trying to understand how to go about determining the frequency of various sounds captured on the phone via microphone. I am attempting to display a graph plotting the frequency of the note.
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Jun 28, 2010
I recently transferred the videos I had on my instinct to the evo. I happen to play one of them for someone but there was no sound/audio on the videos.does anyone know why this happened or how I can fix this? It sucks being able to see but not hear what's going on in the videos.
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Sep 26, 2010
Just made a video with my Motorola xt701. played it on the phone and computer it has no sound. Made another one with me screaming in the phone, still no sound. Do you have to have a mic plugged in to get sound when making a video or is there another issue??
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Mar 25, 2010
I am trying to play the bigger size audio wav file(which is >20 mb) using the following code(AudioTrack) on my Android 1.6 HTC device which basically has less memory. But i found device crash as soon as it executes reading, writing and play. But the same code works fine and plays the lesser size audio wav files(10kb, 20 kb files etc) very well.
P.S: I should play PCM(.wav) buffer sound, the reason behind why i use AudioTrack here. Though my device has lesser memory, how would i read bigger audio files bytes by bytes and play the sound to avoid crashing due to memory constraints. Code...
Could someone guide me please to play the AudioTrack code for bigger size wav files?
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Jan 22, 2013
I have a flash file that I open through smartswf and suddenly the audio is now echoing, like its playing the sound twice. It use to work OK on this ROM (cyanogenmod 10) with this app. It does the same with other flash files also. I have tried other apps and does the same thing, and tried reinstalling flash and rolling back to earlier versions with the same result.
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Feb 18, 2013
I recently rooted my kyocera rise and everything was fine until I decided to install beats audio. My first mistake before installing the drivers was not backing up anything, yes I know that's bad. Okay so I installed the drivers with beats audio from the market then rebooted. Now I have no sound at all. No ring no music nothing. And my phone is running a lot worse now. Now come to find out apparently beats audio is not removable. The drivers can't be removed. I really need sound. Is there a way to unroot and completely factory reset the phone through factory settings?
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Jul 15, 2010
For those of you who have the DX how is the sound on it through headphones when using it as a MP3 player?
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Feb 6, 2010
I plugged my Moto Droid into my truck today and used it for navagation. Sounded great. Later after I unplugged it and tried to make a call on the phone there was no audio coming from the phone. I had to reboot the phone to get it back. I think I read somthing about this someplace. I kinda remember something about the switch sticking in the audio jack. I've only used this jack twice now and the phone is only a month or so old. Is this a known issue?
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May 24, 2009
As per title, recorded video sound is very bad on my Magic - the sound is very unclear, with a lot of disturbances etc is this normal or did I get a faulty phone.
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Nov 21, 2009
In my car I am currently using a cassette adapter plugged into the earphone jack. Two things I noticed.
1) When listening to audio (panda) Nav cuts out the music and speaks it's direction extremely louder than music was playing. Anyone know if there is a seperate setting for the Nav's volume?
2) When listening to panda and I receive a call, panda goes silent but there is no ringtone. at first i thought panda was buffering but when i looked down at the phone I had an incoming call. Normal? Did I dumb thumb something?
I don't think it would be a big problem when it is in the car dock but I haven't used it. On the windshield it's too far away and my car doesn't have any flat surfaces close to the driver. Last thing, with this setup phone call audio comes through the car speakers and with phone on the passenger seat my caller said the call clarity was better than my last phone.
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Jul 31, 2010
Why is that i can`t assign any MP3 file from SD card as ringtone or notification sound from settings tab?
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May 16, 2010
Can anyone please comment on the audio quality through the 3.5mm headphone jack on the Droid? I will be using Skullcandy Titans which are in-ear earphones with noise isolation. I am hoping it is at least as good as that through my iPod nano 4th gen. I know that isn't an amazing benchmark but I'll be satisfied if it sounds at least that good with high-quality audio stored on the SD card. Speaking of SD card, do they still pack in the 16GB MicroSD card with Droids these days?
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Nov 16, 2010
When I play one of the stock ringtones (which, by the way, suck) or stream radio stations, music plays fine. However, I would like to be able to download music to my phone either from my computer or from an app, but every time I try either of those, I hear a popping/dripping noise in the background. It happens both when I preview the song/sound and when I download it, and it doesn't matter where I download them from. I've tried websites, my computer, apps, etc. So frustrating!
It sounds like it may be a problem with the speakers, like maybe they are having trouble playing certain file types or something, but I haven't the slightes idea why this is. That's just a hunch, though. I know nothing about how phones work. Anyone know what might be going on? By the way, I don't know if this affects anything, but my phone is rooted now. The popping/dripping began way before I rooted it, though. Just throwing that out there.
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May 26, 2010
So i didn't put any unofficial software,in other words,everything is as it came out of the store (except lots of apps ofc. the problem is that i doesn't play any sound when i want to play music,or with some app (without headphones,when i have them then it's normal) but when someone calls me or i set an alarm then it plays perfectly normal so i'm confused...it's obvious that speaker is not broken.
Then today suddenly i can't hear anything when i'm in a call,and the person from the other side also doesn't hear me,i also don't know why is that...i'm not an expert for this kinda things and actually i'm quite knew in this world.
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Nov 20, 2009
Has any1 else had any problems using an auxiliary audio cable to connect their droid to their radio in their car? I have been trying it out the last few days and have noticed "crackling" in the left speakers. If i fiddle with the Aux cable that plugs into the phone it clears up. But as soon as I let go its back. Has any1 else had this problem? Is the only fix to return the phone? I have a 39/09 btw.
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Dec 15, 2009
I want to know that android has a touchscreen requirement about hardware and software.And how does touch gesture processing where, for example, in driver layer or framework or application,
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Apr 23, 2010
I'm trying to write an XML parser that takes an RSS feed & fetches the image urls shown in the url attribute of the <media:thumbnail> tag. This is all being done via android.Util.Xml, & is an adaptation of the code shown here. An example RSS feed that I'm trying to use is the BBC News RSS feed. However, media is an additional namespace & (probably) as a result my parser isn't working as it should. A version of my parse method is below. Is there any (no doubt simple) way to get my list of image URLs working?
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Nov 8, 2010
Currently, I use a regular activity with some EditText fields as a registration screen in my application.The inputs are used to construct a soap message which is posted to the registration server, with the response being parsed to do some configuration of the application.I'd like to change this to have the registration page load in a WebView instance, so that the registration process takes place on an external web page.This would make it easier to make changes to the registration process without having to deploy a new build, as it would just be a matter of changing the web page that is loaded in the WebView.The question is would there be any way for me to get the response that is sent back from my registration server to the client? From what I can tell, if I went this route, there wouldn't be a way for me to parse the response like I currently do to initialize the application settings.
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Apr 17, 2010
"Note that when you write an activity, you can make it stop or continue running when it is moved to the background (see onStop() in Activity Lifecycle). For activities that download data from the network, it's recommended to let them continue downloading so the user can multi-task." As far as I was aware I had to create a service if I wanted to have a background activity such as a media player, internet download, or processing of data in files on the SD card continue when the activity was no longer in the foreground.I went and reread the onStop information on the "Activity Lifecycle" page, which was referred to. But I didn't find any mention of how an activity might continue to run in the background after onStop was called.
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Jun 10, 2009
I am creating a custom Widget which extends SurfaceView and I am planning to use it for camera preview.In the main activity I tried to implement some event listeners but can't catch any event.If I press a button the LogCat outputs "Continuing to wait for key to be dispatched" line.Does anyone know how to implement event listeners in main activity using SurfaceView classes?
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