High note data generator

Abstract

A high note data generator for use in electronic musical instruments such as electronic organs, pianos, and the like, wherein the time division multiplexed serial data stream is received, and a single data pulse is generated in the time slot of the first occurring pulse in the data stream. In organs wherein the manual is scanned from high to low, this will be the highest note played, which is convenient from the standpoint of converting polyphonic data to monophonic data for certain organ voicing or for use in solo manual fill note generation. Alternatively, the system can be utilized for converting a pulse spanning more than one time slot into a pulse occupying only a single time slot, which is coincident with the leading edge of the first-mentioned pulse. The system comprises a first latch having its clocking input connected to the serial data stream and one of its outputs connected to an input of an AND gate. The other input of the AND gate is connected to the clock train, and the output of the AND gate is connected to the clocking input of a second latch, which has its output connected to a set input of the first latch. The first latch initiates the pulse at its output when the leading edge of the first occurring data pulse appears at the clocking input, and this first latch changes state when the output of the AND gate changes state, which is a function of the clock train rather than a function of the trailing edge of the data pulse. The high note data pulse appearing at the output of the first latch is, therefore, synchronized with the main data stream and occupies only a single time slot, regardless of the pulse width of the first occurring pulse.