amplitude

问题 I'm trying to create a program, using Qt (c++), which can plot the amplitude Signal (plot like audacity but dynamic waveform) when I playback an audio file (.wav, .mp3) using QAudiooutput and QIODevice . What I've done: with QAudioouput I can play the any audio file, with qwtplot I can plot any signal in 2D, in this case, x-axis will be time and y-axis will be the amplitude. Now, my problem is how to get the amplitude for each second (time)? Any help would be appreciated. 回答1: The normal,

问题 i've been reading another posts about calculate the amplitude in real time from a Mediaplayer, but i have no clear how to get a value useful for me. What i need is a linear amplitude value normalize between 0-100, but as i've watched in another posts they are performing a db calculation which has not much sense, cause they are not normalized to max 0dB value (from How to calculate the audio amplitude in real time (android)): double amplitude = 0; for (int i = 0; i < audioData.length/2; i++) {

问题 I know there are some similar questions here, but most of them are concerning generating waveform images , which is not what I want. My goal is to generate a waveform visualization for an audio file, similar to SoundCloud, but not an image. I'd like to have the max amplitude data for each second (or half second) of an audio clip in an array. I could then use this data to create a CSS-based visualization. Ideally I'd like to get an array that has all the amplitude values for each second as a

问题 How can I calculate Frequency & Amplitude in As3 with FP9. I got the all raw byte using SoundMixer.computeSpectrum(_testbytes, false, 0); var g:Graphics = this.graphics; g.clear(); g.lineStyle(0, 0x6600CC); g.moveTo(0, PLOT_HEIGHT); var m:Number = 0; for (var i:int = 0; i < 256; i++) { m = (_testbytes.readFloat() * 100); g.lineTo(i*2 , 100 - m); } g.lineTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT); Now Can I get the frequency & amplitude data from it? 回答1: If you have a closer look at the

问题 I was wondering if someone could point me to a good tutorial or show me how to graph the amplitude from a byte array. The audio format I am using is: U LAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame. 回答1: It sounds like you are interested in a short term smoothed RMS amplitude measurement. Usually to do this you take a rectified version of the input signal, and then apply a low pass filter to this, e.g. x1 = abs(x); // x2 = rectified input signal x2 = k * x2 + (1 - k) * x1; // simple single pole

问题 I'm trying to make an app that records sound for a second and then reads the maximum amplitude from the recorded sound. This is what I have so far but my app crashes and I can't figure out why. This is my second activity, which I'm calling from my first after I press a "Record" button. The app crashes on my emulator and on my phone. package radu.soundSampler; import java.io.IOException; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.widget

问题 I have a sql table which contains 2 columns: How to calculate the frequency of the highest amplitude wave ? (Each wave is of fixed frequency). Thank you 回答1: Try this select 1/Time as frequency from <table> order by amplitude desc limit 1 来源： https://stackoverflow.com/questions/32948673/frequency-amplitue

问题 I am writing an application that will behave similar to the existing Voice recognition but will be sending the sound data to a proprietary web service to perform the speech recognition part. I am using the standard MediaRecord (which is AMR-NB encoded) which seems to be perfect to speech recognition. The only data provided by this is the Amplitude via the getMaxAmplitude() method. I am trying to detect when the person starts to talk so that when the person stops talking for about 2 seconds I

问题 I have recently posted a similar question, but this is not a duplicate. Apologies for the code heavy post but I wanted to provide as much context as possible. I am having an issue with defining the analytics tool, 'Amplitude' as a service in my Angular.js application. Services are supposed to act as singletons throughout an application (source), so I am confused to be getting the following behavior. In my app.js file, I call AmplitudeService.logEvent('EVENT_NAME') in a .run function which

问题 I'm working on a project where I need to know the amplitude of sound coming in from a microphone on a computer. I'm currently using Python with the Snack Sound Toolkit and I can record audio coming in from the microphone, but I need to know how loud that audio is. I could save the recording to a file and use another toolkit to read in the amplitude at given points in time from the audio file, or try and get the amplitude while the audio is coming in (which could be more error prone). Are