MIDI2Audio / MIDI2Wave / MIDI2MP3 / MIDI Conversion
Two of the most common questions about MIDI conversion are 'How can I convert MIDI to MP3?' and 'Can I make a music CD from MIDI files?' Both are possible, but the MIDI files must first be converted to WAV files. The resulting WAV files can then be burned to an audio CD using any CD recording program, or converted to MP3 files.
| AKoff Music Composer Version 2.0
Buy now ($29) Free download
This software is designed for recognition of polyphonic music from audio source and its conversion to MIDI score. Now one can compose music without MIDI keyboard and even without knowlege of notes or how to play musical instruments. It is as easy as humming a tune into a microphone and Composer will do the rest. Composer will take into consideration individual performance style tracking note dynamics and pitch bends.
Recognition features: Polyphonic music recognition from pre-recorded WAVE files or directly from audio input of your sound card in real-time. Tracking note dynamics and pitch bends. Using different harmonic models to improve recognition of appropriate instruments. Higher harmonics filtering. Restriction of recognized pitch range. Manual or automatic noise sensitivity control.
Composer analyzes a stream of audio signals from pre-recorded WAVE files or directly from audio input of your sound card in real-time. It can be sound from microphone, linear input or audio CD.
Composer normally recognizes polyphonic music with one instrument or voice. This means you won't get the appropriate results if you try to recognize many instruments playing at the same time especially with drums. Composer determines note dynamics and frequencies and translates this information into MIDI events. Composer doesn't automatically recognize the types of sounding instruments. Moreover, human voice and instruments have various timbres and complicated harmonic components, therefore recognition accuracy depends on concrete instrument or singing style. Also the recognition is influenced by quality of WAVE recordings such as background noises and recording level.
The complicated mathematical algorithms of DSP (Digital Signal Processing) require a great amount of calculations and consequently a fast computer. When recognizing audio input in real-time, Composer only works reliably on Pentium 150 and higher processors. On weaker machines, the incorrect working or dead halt of the program may occure, which is removed through pressing Ctrl-Alt-Del keys.
During recognition the recorded notes are automatically shown on the graphic keyboard. After recognition is stopped, you can play and adjust the obtained melody. You can select the playback MIDI instrument, change octave and also try to correct music scale or use Pitch Bend Control. Further you can add the recorded track to the general list of MIDI tracks and then save the generated MIDI file. The last feature is accessible only in the registered version.
If some notes are recognized incorrectly, you can open the saved file in any MIDI editor and manually correct your score. If you have MIDI keyboard, it will be easier to play with keyboard entering results into MIDI editor. But if you aren't a musician, Composer will help you to record your own melody in a popular MIDI format using only your voice or your non-MIDI instrument.
Wave to Midi Samples
You can download and listen to source wave-files and
recognized midi-results. Wave recording format is PCM 11025 Hz, 8-bits, mono.
The unregistered version of our software allows you to evaluate the program features before registering it. If you decide to continue using our software after evaluation, you must register it.
AKoff Guitar Assistant is designed to assist in visual tuning a guitar with microphone or an electrical guitar connected to PCs sound card. It analyzes in real time a stream of audio signals from Wave input of your sound card and calculates the main frequency. This frequency is shown by a pointer on graphic guitar signature stamp (frets), comparing it to the proper frequency. Tuning a string now simply means centering the pointer on the appropriate graphic fret.
AKoff Guitar Assistant recognizes monophonic sound. This means you won't get the appropriated results if you try to play chords. The recognition is influenced by quality of your sound card and microphone.
The complicated mathematical algorithms of the analysis of digital signals require a great amount of calculations and consequently a fast computer. AKoff Guitar Assistant only works reliably on Pentium 133 and higher processors. On weaker machines the incorrect working or dead halt of the program may occure which is removed through pressing Ctrl-Alt-Del keys.
What is Music Recognition?
In a few words music recognition is mathematical analysis of an audio signal (usually in WAVE format) and its conversion into musical notation (usually in MIDI format). This is a very hard artificial intelligence problem. For comparison, the problem of recognition of scanned text (OCR - Optical Character Recognition) is solved with 95% accuracy - it is an average exactitude of recognition of the programs of the given class. The programs of speech recognition already work with 70-80% accuracy, whereas the systems of music recognition work with 60-70% accuracy but only for a single voice melody (one note at a time). For polyphonic music the accuracy is even lower.
To create a MIDI file for a song recorded in WAVE format a musician must determine pitch, velocity and duration of each note being played and record these parameters into a sequence of MIDI events. A music recognition software must do the same things. Even for a single instrument song it is not a simple task, because a WAVE recording contains waveform signals and doesn't contain any music specific data.
In general cases the variety of music timbres, harmonic constructions and transitions make it impossible to create a mathematical algorithm for precise reconstruction of a music score from the audio sources. It is hard to recognize audio data which contains many instruments, drums and percussions or clipping signals, unstable pitch sounds and background noises. However, in many cases AKoff Music Composer will produce a MIDI material that represents the basic melody and chords of recognized music.
WAVE and MIDI Formats
The difference between WAVE and MIDI formats consists in representation of sound and music. WAVE format is digital recording of any sound (including speech) and MIDI format is principally sequence of notes (or MIDI events). The relations are approximately the same as between sounded speech and printed text.
There are many other formats for audio recording. They differ from each other by compression algorithms and can be referred to one group. The conversion from one format into another is very simple. There are many sound editors which allow one to do this.
The following is a list of some audio formats with file extensions: Standard Windows PCM waveform (.WAV) Microsoft ADPCM waveform (.WAV) MPEG Layer (.MP2, .MP3) RealAudio (.RA) Sound Blaster voice file format (.VOC) Apple AIFF format (.AIF, .SND) WMA, VQF and many others.
MIDI to WAVE conversion
The reconversion from WAVE to MIDI is the music recognition problem which up until now has no qualitative solution (with 100% accuracy).
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