MALODY OFFSET HOW TO
MALODY OFFSET SERIES

If the -jams option is specified the script will also save the output as a JAMS file.

MALODY OFFSET SERIES

The script extracts the melody from an audio file using the Melodia algorithm, and then segments the continuous pitch sequence into a series of quantized notes, and exports to MIDI using the provided BPM. If you encounter such a problem, define the pre-compiler variable IsMono in Form1.cs.Extract the melody notes from an audio file and export them to MIDI and (optionally) JAMS files. With some combinations of Mono versions and audio drivers, Console.Beep stays silent. The sound will be saved to a WAV file in the executable's directory. The melody beeped by the 'Play' button can also be saved: right click the PictureBox. The notes will be saved to a PNG file in the executable's directory. Anyway, there's a way to grab the picture: left click the PictureBox. But as only the note names can be entered and decoded again, only those can be copied to the Clipboard. The application displays the result as note names and drawn notes synchronously. The text will be appended to clipboard.txt in the executable's directory. To save the content of a TextBox for later use, focus the box and press Ctrl+Y. It then becomes editable and the number you enter will be decoded to text. For such situations, the text and number fields can be swapped: double click the field 'Content numeric'. Some geeks asked me what is the textual meaning of pi. The application was written for a presentation, that's why there are a few hidden features that don't disturb the listeners with visible buttons or menus.

Enter the note names in the result box.

Select the offset that has been used for encoding.

Of course, you can also decode a melody back to text: If the result is not nice enough, check 'Random melody' and mix again and again until it sounds alright. The characters of the selected one are displayed in the title bar.

Select an offset for the chromatic scale (it's called tonality for future use).

The demo lets you encode text as music in four steps:

Melody: dis d B a f g F gis E Gis fis Fis G C H e D Dis h c b A cis Cis.

Melody: c# c A g d# f D# f# D F# e E F h G# d C C# g# H a G B b.

Melody: H A F# e c d C d# b D# c# C# D g F B a h f G f# E G# g#.

Melody: f e c# b g a G h F# H g# G# A D c f# E F C d C# B d# D#.

Here are a few versions of 'coding in c sharp' (which is number 201255931456816565832252 with an alphabet of 27 characters). Nothing of that will affect the encoded message. As time is not important (yet, in this prototype), you can split quarters into quavers at random. All repetitions will be removed before decoding. But once the notes are sorted, you can insert duplicates wherever you like. That means, we can store a longer text in a melody of the same length.ДЄ melody of plain quarter notes may sound boring. If you restrict the characters to a-z and space, the base is 27 and the text 'hello world' has a value of only 1474967912327400. In the above example, the base of 42 produced extremely high values. To encode more text, we can either use more notes or keep the numeric values smaller.

The maximum numeric message (and therefore the length of the text message) is limited by Factorial(countNotes). (Reminder for non-musicians: C C# D D# E F F# G G# A H B c c# d d# e f f# g g# a h b.)Д d# D e f A G# f# F H g F# C# E g# c# B a G D# c C h b Less Letters, More Words This number can be fed into the algorithm explained earlier, with a chromatic scale being the carrier list. Using this alphabet, the numeric representation of 'hello world' is calculated like that:

I decided to allow 42 different characters: a-z 0-9. An empty message is '0', which is the default sorting of the notes: The message text is treated as a BigInteger. There are 12 notes per scale, two scales have 24 notes, that will be enough for 'hello world'. For longer messages, you can concatenate several melodies. We will mix up a whole chromatic scale to encode one long or a few short words. In this article, we won't spend time on harmonics and composition.

As there are Factorial(count) enumerable permutations, more possible notes mean a bigger alphabet for the secret message. Why not compose a song to encode a text in the melody?ДЄll you need to define is the set of notes you want to use in the song. Music is made of melodies which are collections of notes.

MALODY OFFSET HOW TO

In Steganography 19 - The Order of the Code, you learned how to encode messages by sorting a collection of arbitrary things.

Malody offset