EMBEDDED CLASSICAL GUITAR MIDI INTERFACE WITH THE TWO POINT COORDINATES SYSTEM OF TONE DETECTION CONFIRMATION WITH PIEZOELECTRIC SENSORS ON THE FRETS OF THE GUITAR'S NECK, NUT ANDBRIDGE...

摘要

This is the classical guitar MIDI interface with system for note positiveidentification through two points coordinates system with priority systemdetermination made through use ofconductive plastic polymer strings, metal contacts and piezoelectric sensorson the frets, nut and bridge ofguitar. On the surface of the modified classical guitar frets are placed metalcontact-sensors, on top of thepiezoelectric pickups. The metal film contacts are wired and led to the bufferand than to microcontrollerwhich scans buffer outputs with high frequency range of several MHz The metalfilm contact switches areplaced on the fret exactly on the projected vertical line underneath thestring.In between of these contacts are placed combined sound and electric insulatorsmade of materials whichisolate electrically two adjacent metal fim contacts and are in the same timesound (vibration )absorbents. Theyhave enough width to allow string slight lateral movement when pressed withoutloosing contact. These contactsare constantly scaned by the microprocessor with high frequency rate ofseveral MHz or more and in inactivestate they are logic LOW while in active they are logic HIGH. Signals frommetal sensors would be bufferedbefore being delivered to microprocessor. Microprocessor will be programmed tohave priority designation foreach fret starting with the highest 19th fret as the priority 1, 18th priority2 and so on to the last priority whichis sensor on the nut at the end of neck , according the position of fret'scontacts and pickups, to give priorityflags to each so that are eliminated all which are bellow pressed position onguitar's neck, which simply is theway guitar sound is produced assuring positive tone recognition.They are the first of the note identification sensors.