Abstract: In a guitar or the like where fretting is detected by ultrasonic signals emitted by a transducer bridge and reflected at a point of each string held against a fret, and the same transducer bridge is responsive to audible frequency string vibration induced by a player, a damper bridge selectively dampens propagation of lower frequency vibrations from a note triggering string section adjacent to the bridge to a note selecting string section extending over the fretted neck, thereby minimizing intereference between fret detection and note triggering functions using a single set of string and a single acoustic transducer for each string.

Abstract: Note bending in a MIDI interfaceable fretted string instrument is detected by sensing relative phase shifting in an echo return of an ultrasonic acoustic signal propagated along each string. The delay between the propagated signal and echo return is indicative of the musical note obtainable by playing the string. The propagation and sensing may be accomplished by means of a single piezoelectric transducer coupled to each string, and the same transducer can sense string vibration in the audible frequency range indicative of the timing and amplitude of a musical note played on the string.

Abstract: A transmitter and receiver for "MILES" type systems is in a pistol type configuration, and is provided with a display, to indicate the mode of the controller unit, as well as the specific MILES codes which are transmitted or received. The versatile unit is particularly flexible in its ability to test the various components of Multiple Integrated Laser Engagement System, with "MILES" being the acronym for these combat training exercise systems. A continuous rotary control switch determines the mode, either (1) transmit, (2) receive, or (3) identity change. In the transmit mode, rotation of the switch will change the transmitted MILES code, and actuation of the trigger switch will transmit the MILES code and an associated identity code. In the identity change mode, operating the trigger switch will change the I.D. number of the "player". In the receive mode, the display will show the received MILES code, and the player identity number.