MITSYN Numeric Array Editor/Designer
The MITSYN Numeric Array Editor/Designer supports the viewing/editing of two dimensional arrays of numeric values. As such its primary use is the editing or preparation of such data used by the other MITSYN tools. Some of the many uses of such numeric arrays are shown below, which demonstrate the support for such applications included in the Editor.
Waveform Segment Editing
Segments of waveform files selected using the Waveform Editor may be edited using the MITSYN Numeric Array Editor (Edit→Selection Content using Numeric Array Editor command of the Waveform Editor). Using this tool individual sample values may be easily changed, whole segments may be set to zero or multiplied by some factor, segments may be ramped up and down, sample values may be drawn in with the mouse, etc.
Numeric Array Editor working with a Waveform Segment
Each channel of the waveform segment becomes one row of the numeric array.
The File→Save As commands may be used to save such segments as numeric array files in various file formats. This is the operation used to extract sounds from waveform files and make them into "wavetable" files (one of many applications of the MITSYN vector file format).
Wavetable Editing
"Wavetables" are segments of signal samples often used in the synthesis of sounds. Two typical uses are as segments to be replicated once, and as the definition of the shape a single cycle to be repeatedly scanned by an oscillator to generate a periodic waveform. The first form was shown just above as "Waveform Segment Editing". The second form is shown here.
Rows of numeric arrays may be used as "wavetables" by oscillators. This means that the row of numeric values is used to represent one cycle of the oscillator's output. The row is repeatedly scanned at the oscillator's current fundamental frequency to generate a waveform. In this usage a "weighted sinuoidal harmonic" representation is convenient, and in the mode shown below the Numeric Array Editor is being used to adjust harmonic weights by ear, i.e., by dragging "draw bars" which control harmonic weights while listening the result.
Numeric Array Editor working with a Wavetable for an Oscillator
Mapping Shapes, e.g., Shapes for Envelope Generators
Another common use of numeric array data is to specify the shape of "mapping functions", i.e., functions which map from an x (domain) value into a y (range) value. In sound synthesis such maps are commonly used by "envelope generators" which are used to specify amplitude shapes. Data so used are often just drawn in directly using the mouse (the "pencil" drawing tool in the toolbar).
Numeric Array Editor working with function map data
Filter Design
Another application of an array of numbers is as the coefficients of an FIR or "finite impulse response" filter. Such filters are used in stream processing blocks to realize arbitrary linear phase bandpass filtering. The Numeric Array Editor includes an "optimum FIR filter" design algorithm which supports the design of such filter coefficient vectors. This is documented under "Filtering with the MITSYN Stream Processor".
Implementation
The MITSYN Numeric Array Editor is implemented using the two major MITSYN Languages, the Scripting language and the Stream Processing (block diagram) language, and the implementation is included so you may modify and/or extend this tool as desired.