I have been searching for ways to produce sound in as3 and found SION: https://sites.google.com/site/sioncenter/
Seems great, but I have one issue: I need to play tones at specific frequencies. The only options I find to play sounds is by specifying the frequency as musical notes (a, b, c, etc), but I need to play sounds specifying the frequency in Hz (30Hz, 100Hz, etc).
Is there a way to do this in SION?
If not, is there an alternative to SION? I need a sine wave generator.
You don't need SION for that. You can do it with the Sound class.
Here's a tutorial that shows exactly how to do it:
http://www.bit-101.com/blog/?p=2669
Related
I'm making an multiplayer game and I bumped into a problem, I want to interpolate player position so it would not look jittery when player is having bigger ping/latency, I'm using vector2 interpolation but every single of the interpolation formula is decreasing/increasing speed in the middle/beginning/middle and I need so that interpolation speed would always be the same (so it would look like player is moving not floating)
The thing you want is the dead reckoning alghoritm which is unfortunately not supported by Libgdx by default. There are many ways to implement this basing on what kind of game you are creating.
There is no one good answer for your question but let say you are making a simple runner where players are going forward and they can jump. The naive implementation for multiplayer like this would be to change opponent's position due to notification he is sending. Now you are interpolating the position between notifications however you should rather assume that the opponent is still runing and when get notification that he jumps then correct position and perform jump an so on...
There are dozens of articles about dead reckoning in the internet. You can start with this one.
One pet peeve I have with a lot of older rock music records from the 60's and 70's
is they sometimes are slightly of of tune with the standard a440 reference pitch, so playing along on my guitar sounds bad. Right now I manually adjust the pitch of the track by ear in Audacity, but this often takes some time. I was hoping there was something out there that could detect the frequency of the first few notes of a music file, analyze that and see how far it is from any standard A440 note, and then you could use that number to determine how much you needed to make the track sharp or flat to match A440 tuning.
Is it possible to create an app that automatically retunes slightly out-of-tune music to be A440 with Javascript?
Yes. Check out this pitch detection demo by Chris Wilson.
There are some big caveats though, and they don't really have anything to do with JavaScript.
Voice Selection
What instruments do you care about? Obviously wideband stuff like percussion is atonal... but it's still going to turn up in your audio, and will have a pitch. How about the difference between a voice and wind instruments? A lot of vocalists will go off pitch intentionally. You will need to use bandpass fliters to get the range you care about, at a minimum.
Original Intonation
What about the instruments being in tune in the first place? "Another one bites the dust" comes to mind as a rock record from the 70s that starts off terribly out of tune... and maybe intentionally.
Pyscoacoustics and Harmonics
Sometimes we hear things that aren't really there. If I play a trombone down a scale, to the very bottom of its range, it will actually stop producing a fundamental... yet because I was playing a familiar scale downward, us humans will still perceive one. This might not throw off your detection by a lot, but it will somewhat, particularly on those atonal-but-not-really percussion instruments.
In summary, this is possible but it's going to be a lot of work. Please come back and post a link once you've done this!
I think about writing a H264 encoder / decoder from scratch to be able to integrate the tech into a composite product. The first implementation would be written in Java.
I am used to implement scientific papers and such so I should at least bring in the basic math understanding.
What would be the best start and what should I focus on. I know that basically H264 is a mix of existing techniques.
What is are the most important things to implement?
Any idea about how much hours of work the first useful version will take.
The main objective is very fast while maintaining good compression.
How many hours? Maybe 20,000. The decoder specification alone is over 750 page document. And the decoder is the easy part.
After consideration :), I now will still use my own solution based on PNG and JPEG while not using motion vectors. I simply wrote a small solution I can compress parts of the image based on those and use filters to degrade the quality by applying sorts of blur or reduce the number of colors or even resolution. Works well enough for now.
If I need better quality I start looking at VP9 in more detail.
The only draw back is no hardware encoding support which might force me / us to look into H264 again.
Currently I can deliver 60+ frames for every days situation and scale down to 15 frames per second for video content along with bad quality but it is good enough to grab a security cam screen and see if something is wrong.
I'm dealing with an audio anomalie. I have audio that is mastered quite loud, yet on some systems, it is too quiet. Boosting the audio file anymore causes clipping.
It would be fine, except for the fact that, in my project, a lot of other sounds are in use as well. Lowering the volume of everything to match this would make some stuff impossible to hear. And again, this doesn't happen on all computers, only some.
To compensate, can I boost audio in code? The SoundChannel I'm using is already at 1.0 volume (full), and I know I can't use that property to boost it further. Is there any way to raise the audio further in code?
(I'm using Flash Professional CS5.5, Adobe AIR 3, and ActionScript 3)
After some time, I've concluded that it is apparently not possible to boost sound volume above 1 (that is, to amplify) using Flash's API. While you can set SoundTransform to a number greater than 1, it will coerce to 1 nevertheless.
If anyone has information to the contrary, you are welcome to post the answer and I'll change which answer I've accepted if you solve the problem.
You are correct. Sounds cannot be played at a volume above 1 (100%). However -- You can play two identical sounds simultaneously on different channels. This would effectively give you an audio boost above 1. But depending on the nature of the sound you may get some distortions from synchronization. If you're talking about a sound-effect without a lot of discernable Attack, you may get away with it. If you're talking about speech or percussive sound, your mileage may vary.
I'm working with a few programming buddies to create an AS interface to the kinect and one problem we're running into is image differencing. We need to be able to throw out image data that doesn't change from image to image so we can pin-point only things that are moving(i.e. people).
Anyone have any experience with this or a direction we can go?
I would consider creating a pixel bender shader to find the difference and also do any other math or tracking. Pixel bender gets its own thread outside of the normal flash player so you can get some more horse power for your setup. Pixel Bender shaders can be applied to bitmaps, vectors, or video so I think it is perfect for this project. Good Luck!
http://www.adobe.com/devnet/flash/articles/pixel_bender_basics.html
And is is a full collection of shaders including difference
Take a look at the threshold method on BitmapData.
It'll allow you to do this stuff. Their docs have a simple example so check that out.
It might be a long shot, and this is just me rambling, but in sound theory (strange how I'm relating it to image cancellation, but here goes...) the concept of cancellation is when you take a wave sample and add its inverse. It's how you make acapellas from instrumentals + originals or instrumentals from acapellas + originals.
Perhaps you can invert the new image and "normalize" the two to get your offsets? I.e. the first image is 'black on white' and the second image is 'white on black', and then detect the differences for the bitmap data. I know I did a similar method of finding collisions with AS3 a few years back. This would, in theory, cancel out any 'repeating' pixels and leave you with just the changes from the last frame.
With BitmapData your values are going to be from 0 to 255, so if you can implement a cancellation (because a lot of parts of the image are going to stay the same from frame t frame) then you can easily find the changes from the previous frame.
Just a thought! Whatever your solution is it's going to have to be quick in order to beat the flash runtimes' slow speeds. Your Kinect read FPS rate will be greatly hindered with bad code.
Here is some frame differencing code I wrote awhile back. It uses bitmapData: http://actionsnippet.com/?p=2820
I also used this to capture moving colors in a video feed: http://actionsnippet.com/?p=2736