UGens are only active (processing audio) when they are connected to the input of another active UGen, and are not paused. You can either connect all of the outputs of a to all of the inputs of b, e.g., b.addInput(a), or connect a specific output to a specific input, e.g., b.addInput(0, a, 3) connects output 3 of a to input 0 of b. To connect a UGen to another UGen, use one of the addInput() methods. An audio chain is simply a set of UGens connected together in some way. UGens don’t do anything until they’re part of an audio chain. Finally, a UGen can encapsulate a more complex configuration of other UGens (see audio chains below), by allocating input and output proxies. Certain UGens, such as Envelope, Glide and Static, are particularly useful for controlling these audio rate parameters. For example, the Gain UGen can have the gain level controlled from a WavePlayer UGen for amplitude modulation, and a WavePlayer UGen can have its frequency controlled by another WavePlayer UGen for frequency modulation. UGens can also use other UGens as audio rate controllers for specific parameters. UGens can be instantiated and connected to other UGens to create audio chains. UGensĪ UGen (unit generator - terminology borrowed from SuperCollider) is an audio processing unit with zero or more audio input and output channels. Once you’re ready to go you can start your AudioContext or set it to run in non-realtime mode. AudioContext has a public field ‘out’ which you plug your output sound into. Ultimately, AudioContext will be abstracted and subclasses will be provided to work using a number of different IO solutions (e.g., JavaSound, JJack, RTAudio, JavaME audio, VST). In simple circumstances it will suffice to create the default AudioContext. Most UGens need an AudioContext at instantiation. The AudioContext helps keep audio processing in order, taking care of IO, the audio format of the processing (e.g., sample rate) and the size of buffers that Beads uses internally to calculate audio. The Audio Contextīeads uses the class AudioContext as the first port of call for all audio programming. The following topics assume some Java knowledge, so if you’re getting started, expect to come back to these topics as you go. You will need to be able to program, but you can learn on the job following the Eclipse examples easily on any platform. Who? Anyone who wants to make computer music or audio applications. A longer-term wish is to rid Beads of other JavaSound dependencies and give it solid, self-sufficient audio file IO capabilities. Beads has a flexible exchangeable audio IO layer so porting it to places besides ordinary desktop Java is fairly straightforward. For development purposes, “where” can mean in Eclipse, NetBeans, another IDE, the commandline, or embedded in Processing, MaxMSP or other media environments, and on the web. “Where” is easy, because Java is pretty omnipotent, and because Beads is open source. Beads is pure Java, meaning it’s easy to work at every level of an application from the same set of sources, and it uses a simple set of framework classes to make quick development of musical applications as easy as possible, and it’s got some cool features. Why? It’s hard to argue that there’s nothing else out there that does the same thing, but there’s nothing else out there that does exactly the same set of things in the same way. What Beads is is a library for programming audio in Java for musical and other creative sound applications. PS: My current favourite is square wave through biquad and reverb.Beginning with what and why, then where and who. Please let me know if this is any help, or you can scold me if it's not. Create a "wave" by using a slow sine wave. Don't forget to start the audio running!īiquadFilter bf = new BiquadFilter(ac, 2, BiquadFilter.LP) Add the white noise to the filter's inputs. Set the filter's frequency and Q-value. Create a 2-channel band-pass filter with constant peak gain.īiquadFilter bf = new BiquadFilter(ac, 2, BiquadFilter.BP_PEAK) Start with some white noise as source material. There are some examples in preparation but not currently in the tutorials, only if you grab the whole Beads project using SVN (in which case they're in src/beads_examples).
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