pcm

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How to get frequency from fft result?

I have recorded an array[1024] of data from my mic on my Android phone, passed it through a1D forward DFT of the real data (setting a further 1024 bits to 0). I saved the array to a text file, and rep[详细]

2023-04-11 18:16 分类：问答
Using FFT in Android

I am having trouble understanding how I should pass PCM data from the mic to this FFT class I am using made by Piotr Wendykier (it\'s the DoubleFFT_1D class in JTransforms).[详细]

2023-04-10 09:19 分类：问答
JTransforms FFT in Android from PCM data

I\'ve been playing with this now for sometime, I cant work out what I am meant to be doing here. I am reading in PCM audio data into an audioData array:[详细]

2023-04-10 07:12 分类：问答
How can I get frequency data from PCM using FFT

I have an array of audio data I am passing to a reader: recorder.read(audioData,0,bufferSize); The instantiation is as follows:[详细]

2023-04-09 17:48 分类：问答
Recording an AudioTrack to a sound file

I am creating PCM data (from sine waves) and piping them to the speakers using AudioTrack. I\'d like to record this as a wav file (or a comparable format). I\'ve looked at AudioRecord but it takes a[详细]

2023-04-07 01:33 分类：问答
Android AudioTrack playing .wav file, getting only white noise

When I play a file with the following code: private void PlayAudioFileViaAudioTrack(int ResId) throws IOException {[详细]

2023-04-04 03:55 分类：问答
How can I read info from .wave file using JavaSound (Java, Java Sound)

Hi I need to read SampleRate,开发者_C百科 SignalFrequency and Amplitude from .wave file. How can I do that using JavaSound?You can get the sampling rate by getting a handle on the AudioFormat object:[详细]

2023-04-01 03:49 分类：问答
Reading raw PCM samples from an MP3 file using QtMultimedia?

Is there a way to use QtMultimedia to access the PCM raw audio samples of MP3 files stored on a, say, Nokia N950 phone?[详细]

2023-03-31 00:01 分类：问答
How to visualize microphone sound/pressure level in Silverlight 4?

I was following this tutorial on how to make a Silverlight audio recorder. I thought it would be great to add a volume bar indicator to provide user with a feedback on what\'s happening. However, I ca[详细]

2023-03-26 09:45 分类：问答
PCMU fade out effect

I want to achieve PCMU fade out effect of the a开发者_开发问答udio. Lets say I have two pieces of 160 bytes of audio which correspond to 20ms audio duration each and I want to insert some silence betw[详细]

2023-03-23 11:20 分类：问答