pitch

EDIT: In the end I used exactly as I explained below, AVRecorder for recording the speech and openAL for the pitch shift and playback. It worked out quite well. I got a question regarding recording, modifying and playing back audio. I asked a similar question before ( Record, modify pitch and play back audio in real time on iOS ) but I now have more information and could do with some further advice please. So firstly this is what I am trying to do (on a separate thread to the main thread): monitor the iphone mic check for sound greater than a certain volume if above threshold start recording e

Yesterday I finalised the code for detecting the audio energy of a track displayed over time, which I will eventually use as part of my audio thumbnailing project. However I would also like a method that can detect the pitch of a track displayed over time, so I have 2 options from which to base my research upon. [y, fs, nb] = wavread('Three.wav'); %# Load the signal into variable y frameWidth = 441; %# 10 msec numSamples = length(y); %# Number of samples in y numFrames = floor(numSamples/frameWidth); %# Number of full frames in y energy = zeros(1,numFrames); %# Initialize energy for frame = 1

How do you go about changing the pitch of an audio signal in matlab?. Essentially I just want to change the original qualities of the audio signal without making a dramatic change. I'm trying to use the original input audio to simulate a chorus by changing its qualities slightly so that I can have multiple variations of the audio to simulate the chorus. This simplest approach might be a phase vocoder. You can find one matlab implementation here: http://labrosa.ee.columbia.edu/matlab/pvoc/ This is a rabbit hole, though. There are so many more techniques that can employed to improve the quality

I see that I can retrieve CMAttitude from a device and from it I can read 3 values which I need (pitch, roll and yaw). As I understand, this CMAttitude object is managed by CoreMotion which is a Sensor Fusion manager for calculating correct results from compass, gyro and accelerometer together (on Android it is SensorManager Class). So my questions are: Are those values (pitch, roll and yaw) relative to the magnetic north and gravity? If above is correct, how can I modify it to give me results relative to the geographic north? If a device (such as iPhone 3GS) doesn't have an gyroscope, do I

My group is developing a simple MATLAB Graphical User Interface (GUI) that is supposed to record audio from a microphone - plugged in or built in to the computer - and play back the signal. So far we have that completed. Our GUI also can load a sample (a .wav file, etc..) and play it back using the same "Play" pushbutton on the GUI. We have a Play, Record, Load, and Save push button. Now for the pitch-shifting of loaded or recorded samples... We know we need a peak-picking algorithm to find the fundamental frequencies of the signals. We were then thinking that we could multiply each of those

I'm trying to develop an Android app that extracts audio frequency from an instrument. I'm using Fast Fourier Transform method with Jtransforms. Here is what I have so far: public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); new readFrequencies().execute(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } private class