ActionScript 3.0 :: Flash ComputeSpectrum: How Often Does The Data Change
Jun 25, 2010
I am executing a computeSpectrum function every 1/10 of a second (the speed I should be sampling the sound frequency to obtain a data bit). However the computeSpectrum seems to be giving me the same output every two or three times I call it.
Take a look at the source code and check the Binary read. Notice the binary read is repeating numbers, and the lack of single '0' or '1' bits? There should be some single '0's and '1's in there! I even made arrays of all of the input to check if the uncompressed ByteArray data was repeating and sure enough, the samples were quite often IDENTICAL every 2 or 3 calls...
PS: The audio sample data [More audio samples available there] I'm using is Peceptive Development's 'How to talk to Tin Can' [More info on reading audio as data there]. The audio sample provided in the archive is 'Low speed', which means the data is being sent at 100 baud (100 baud / 1000 ms = 10 bits per second)
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May 30, 2011
I'm used to using SoundMixer.computeSpectrum, but I need to get some data on-the-fly from the microphone (and I can't use the SoundMixer with the microphone).
I'm having trouble translating the FFT data (from this class) as shown in this excellent spectral analysis example to match the ByteArray output from computeSpectrum. My existing code is built to handle the data received from computeSpectrum (with FFT set to true).
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Mar 28, 2011
i have some arbitrary signal data which i'd like to get a frequency analysis of. it's not audio data. is there a way to coerce AS3's computeSpectrum() call into doing this work for me ?
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Jun 25, 2011
I wrote something to capture sound from my microphone. I can visualise the sound data with SoundMixer.computeSpectrum.is there a way to mute the sound and still get sound data from SoundMixer.computeSpectrum?Now I have this:
sc=son.play();
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sc.soundTransform = t;
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Jan 18, 2010
I have a Flex3 app I wrote and I'm streaming audio over RTMP from a Red5 server. I'd love to be able to use SoundMixer.computeSpectrum(), but the spectrum data is all zeros. In one location, Adobe writes that SoundMixer.computeSpectrum() does not work with RTMP data:
"For media loaded from RTMP sources, you cannot use the BitmapData.draw() and SoundMixer.computeSpectrum() methods to extract run-time graphics and sound data." [URL] Clear enough. Except, there's the actual documentation for computeSpectrum(): "In addition, this method cannot be used to extract data from RTMP streams, even when it is called by content that reside in the same domain as the RTMP server. [...] This method is supported over RTMP in Flash Player 9.0.115.0 and later and in Adobe AIR."
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Jun 8, 2011
I'm developing using Actionscript 3.0 for Flash Player 10.3.I'm using computeSpectrum() on a loaded .mp3. Running *Event.ENTER_FRAME* to get snapshots of each sample in an byteArray.The ByteArray contains 512 values (256 for each channel). These values are FFT Spectrum, ranging from 0 to 1.I can't use the peak frequency for each of the samples (as I found found out!) because the highest value is not necessarily the fundamental frequency. As a result I'm getting lots of random values all over the place.Of course I'm getting some correct too, but that's not enough.
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Oct 30, 2004
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Oct 5, 2010
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Nov 4, 2011
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Sep 7, 2006
I am creating a slideshow within Flash that uses XML data pulled from a database. Is there any way to manipulate the image size from within Flash? I am going to use the slideshow for a plasma display, and have clients uploading image files at random, which are then added to our database. I need each image to be 16:9. I know the easy way to control this would be to give the clients size requirements - we will do this in the future - but unfortunately there are hundreds of images already in the database that are already odd sizes. While it's clearly possible to change the size of the movie itself, is there a way to force each image that is imported from the XML to be a particular size - say 800 x 450 or 1200x 675 or 1600 x 900? (i.e. -- can I force the XML generated image to fill up the whole screen/browser window, regardless of what size it is?) It does not matter if the image gets distorted or stretched.
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May 21, 2009
Using the example found in the class documentation, you'll notice the bass frequencies are crammed on the low end too much, and the higher frequencies will sometimes register even in the bytearray.position = 0 float. Is this a problem with the design of the computeSpectrum class? Because I can take the same file, put it in another spectrum analyzer and see the bass and treble spread more evenly.[URL]
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Jul 31, 2009
I'm building a media player with a sound visualizer using computeSpectrum(). When I adjust the volume, there is no longer any data for the visualizer. Does anyone know a way to adjust the volume of audio, but still access audio data using computeSpectrum() as if the sound were still audible?
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Jul 4, 2010
Just wondering how often Flash (as3) will allow me to computeSpectrum? I am currently attempting to computeSpectrum 100 times per second, but I am finding that the data repeats every few times.
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Apr 27, 2011
I have a datagrid in my Flash app whose data keeps updating quite frequently.On every update, I need to change the cell color of only those cells whose data has changed.That too, if the updated value is less than the older value then the cell color should change to RED else, GREEN.I have tried using labelFunction, cellrenderer, etc. But to no avail.By no means, I am able to access the present data in the cells to compare it with the new data.
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Apr 17, 2008
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Mar 31, 2011
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[Code]...
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Since there's (obviously) only one instance of SoundMixer in any given file, is it not possible to run computeSpectrum discreetly on different soundfiles loaded into an application? Basically I want to visualise each sound differently. Anyone come across any workarounds?
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Jul 8, 2009
For the past couple of weeks I've been wracking my brains over SoundMixer.computeSpectrum(), arguably the coolest method in ActionScript 3. It's the one that spits out the last 256 (or so) audio samples that hit the speakers, with the option of viewing that data in the time domain (waveform) or the frequency domain (Fourier transform). It's great for visualizing music, but its major drawback is that it only operates on global, playing audio, which means you cannot visualize different channels or preprocess the visualization.
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[Code]...
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Jul 31, 2009
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Dec 19, 2008
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SoundMixer.computeSpectrum:
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cannot access
http://dev1.kbrcomm.com/OLA/ICE_intro_rev9.swf.
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at flash.media::SoundMixer$/computeSpectrum()
at widget5/onEnterFrame()
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Error: Error #2030: End of file was encountered.
at flash.utils::ByteArray/readFloat()
at widget5/onEnterFrame()
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