TS-AudioToMIDI performs recognition of music audio files and allows saving the results as MIDI files.
Each melody can be represented in two distinctly different forms.
The first is notes representation, when we describe melody as a set of commands such as "play note A with violin, volume equals to 100, duration is 400 ms". Both MIDI sequencer and symphony orchestra can be controlled by such a set of commands. Two most common ways to store a melody described in this way are MIDI file and musical notation.
The other way is to store waveform. Waveform is the dependence of acoustical pressure on time. Not only music can be stored as waveform, hence not any waveform can be converted to notes. For example human speech can't. Analog tape and wave format file store sound in this way. During last decade numerous waveform-conversion algorithms were developed, both with and without data loss. Most common formats of compressed waveform are mp3, MPEG, RealAudio(.ra file extension), and others.
Music recognition is what musician does when playing music by ear and then recording it to staves. Recognition requires previous knowledge of music structure, common instruments etc. and ability to detect musical sounds with sufficient precision. In most cases music heard cannot be recognized unambiguously because the same waveform can be interpreted as several different note sets. This is very usual for polyphonic music when even professional musician can hardly say what notes were played by each particular instrument.
TS-AudioToMIDI performs automated music recognition. This program analyzes input waveform and tries to detect what notes were played. Some basic knowledge about music structure, such as Harmonic Model are build-in into recognition algorithm, an array of sensors with controlled selectivity and sensitivity allows precise detection of spectral peaks. However science still hasn't developed an errorless algorithm for recognition, so mistakes are possible. Adjusting settings individually for each recording allows reducing error rate. In general any recognition process looks as conversion from WAVE info MIDI format.
Please note that TS-AudioToMIDI does not convert MIDI to WAV. This task is the opposite and is performed by programs called software MIDI renders.
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TS-AudioToMIDI in brief
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