Nsound is a C++ library and Python module for audio synthesis featuring dynamic digital filters. Nsound lets you easily shape waveforms and write to disk or plot them.
In Nsound, all audio data is represented by 64-bit floating point numbers between -1.0 and 1.0. It is easy to scale the data and adjust the volume by multiplying the audio data by a percentage, a number between 0.0 and 1.0. The audio data is is only converted to 8-bit, 16-bit, 24-bit, 32-bit or 64-bit when it is written to the disk with the Wavefile class.
The core of Nsound is the Buffer class. Memory is dynamically allocated and frees the user from worrying about buffer sizes. All the mathematical operators are overloaded to allow intuitive expressions.
Generators produce oscillations of the waveform stored in them. Generators can produce a single frequency of the waveform held in them, or can dynamicly change frequency, just draw a line that represents frequency and pass it into the generator.
A collection of IIR & FIR filters are also included. When creating filters, the cutoff frequency is specified in Hz. The filters are also real-time, meaning they keep track of their internal state and for each audio sample passed in, an audio sample is returned.
Beautiful plots can be easily created if your platform has the Python Matplotlib package installed. Most of the Nsound classes have their own plot methods.
This User’s Guide will specify code snippets written in Python. The C++ code is nearly identical. For specific C++ reference, view the Doxygen generated documentation available on the Nsound sourceforge website.