waveform

问题 I want to modulate the square waveform of the Web Audio API OscillatorNode by connecting to other OscillatorNodes. But I can not find the parameter in the AudioParams. Is this possible at all or is there a workaround? I thought about creating a "custom" wavetable Oscillator with the "audioContext.createWaveTable()" function. This wavetable could contain different pulses with sweeping pulsewidths. But than again I have no idea how to control the position of the wavetable pointer via

问题 I am trying to make a formula to output a triangle wave using logic instead of additive Synthesis since using additive Synthesis is more CPU intense. More info can be found here, 'Problems with formula to output a triangle waveform in Java' I have edited the code a bit since then. My problem is that the linear triangle wave generation formula is not precise. It has distortion and is too sharp for higher notes. The method I am having trouble with is liniarTriangle() public class

问题 I got my wave file creator working and I split it into three classes, I also made a sinewave generator that inherits from an abstract class called waveform and I can export 8 and 16 bit mono or sterio sine waves. I am trying to make a class called TriangleWave Generator to output a triangle wave tone, but I can't get the algebra from https://en.wikipedia.org/wiki/Triangle_wave#, the first formula, to work. It will only export the highest harmonic stated and not blend them together with the

问题 I'm looking for some help converting as3 code to pixelbender code in an attempt to improve the performance of my application. This as3 code goes as follows. I scan through the Number values of a bytearray in chunks. Lets say this chunk lenght was 100 numbers I read 2 numbers (left and right) and try find the maximum values. The numbers in my bytearray are PCM data so there is millions of them and this code can often take a long time to execute, especially on a low spec machine. The whole aim

问题 I'm looking for some help converting as3 code to pixelbender code in an attempt to improve the performance of my application. This as3 code goes as follows. I scan through the Number values of a bytearray in chunks. Lets say this chunk lenght was 100 numbers I read 2 numbers (left and right) and try find the maximum values. The numbers in my bytearray are PCM data so there is millions of them and this code can often take a long time to execute, especially on a low spec machine. The whole aim

问题 For an Android app (for Android version 2.1),I want to analysis a sound file and get the frequency. Therefore I want to include javax.sound.sampled.* for that purpose. How can I get that? Any external jar file can do it for me? Any such jar file is available? 回答1: Android does not support it :( 回答2: A Fast Fourier Transform (FFT) library should be usable for your purpose. Unfortunately I cannot recommend any as I haven't tried them myself. 回答3: After lots of google searching, finally stumbled

问题 For an Android app (for Android version 2.1),I want to analysis a sound file and get the frequency. Therefore I want to include javax.sound.sampled.* for that purpose. How can I get that? Any external jar file can do it for me? Any such jar file is available? 回答1: Android does not support it :( 回答2: A Fast Fourier Transform (FFT) library should be usable for your purpose. Unfortunately I cannot recommend any as I haven't tried them myself. 回答3: After lots of google searching, finally stumbled

问题 For an Android app (for Android version 2.1),I want to analysis a sound file and get the frequency. Therefore I want to include javax.sound.sampled.* for that purpose. How can I get that? Any external jar file can do it for me? Any such jar file is available? 回答1: Android does not support it :( 回答2: A Fast Fourier Transform (FFT) library should be usable for your purpose. Unfortunately I cannot recommend any as I haven't tried them myself. 回答3: After lots of google searching, finally stumbled

问题 I'm new to android programming and audio visualization. I want to create a simple audio visualizer using MediaPlayer and Visualizer classes. My problem is, I don't know what wave form data really is. Must I use it to visualize audio? I'm using the code below. It's problem is, it will only visualize audio for the first 10-12 seconds of the file; after that, I'm unable to capture more data! Where did I go wrong? public void attachVisualizer() { Visualizer vis = new Visualizer(mPlayer

问题 I am trying to make an ECG viewer reading DICOM files. I get all data (like Channel Definition Seqeunce), also got the waveform samples to each channel. My problem is that there is a Tag (Channel Sensitivity), and I can't figure out it's meaning. What purpose does it have? 回答1: After you have the raw value for a sample you have to apply some transformations defined by several tags. Channel Sensitivity is a mandatory field when samples represent defined units and it must be used in conjunction