Abstract: A resonance tone generation apparatus 20 is applied to an electronic musical instrument DM having a tone generator for generating a musical tone signal indicative of a piano sound in accordance with a tone generation instruction signal having a key number n, and a plurality of output portions for externally outputting a musical tone signal. The resonance tone generation apparatus 20 has a plurality of resonance tone generation circuits 30(n) each of which is assigned a different key number n, retrieves a musical tone signal indicative of a musical sound of the piano, generates a musical tone signal indicative of a resonance tone imitating a tone of a string of the piano resonated by the musical sound of the piano indicated by the retrieved musical tone signal, and supplies the generated musical tone signal to the plurality of output portions.

Abstract: The present invention discloses a kind of electronic organ with free-combined keys and the method to realize free combination of key groups. The electronic organ comprises host processor and key groups. The method includes steps: S1, Connect freely combined key groups to the electronic organ; S2, The host processor obtains the number of the key groups, address information and locations of keys in key groups; S3, The host processor sets the function or scale for each key according the number of key groups, address information and locations of keys in key groups. The present invention realizes free combination and disassembly of key groups by a method recognizing the free-combined key groups. It makes miniaturization and portability of electronic organ possible and strengthens user experience. Its structure is simple and it brings good economic and social benefits. The present invention can be applied to a variety of electronic organs.

Abstract: For reading the frets of a stringed electronic musical instrument, a plurality of resistance wire strings are secured to a nut end and a bridge of the instrument, with the strings superposing in parallel relationship over a plurality of conducting frets mounted on a fingerboard on the instrument. The voltages produced by depressing the strings to the conducting frets, after being inverted and linearized, are quantized to levels representative of the particular frets to obviate the effects of contact resistance, and decision voltage levels are selected so as to account for such contact resistance. To enable the signals to be fed as conventional information through a MIDI channel to a synthesizer for generating frequencies corresponding to the signals, an analog to digital converter is used. The different components, as well as the digitized linearized signals, are selectively controlled and fed, respectively, to a microprocessor.

Abstract: A key assigner system for an electronic musical instrument having an assignment memory assignment channel number N equal to or less than the number of signal sources of a musical tone signal generator for storing information such as a key number and/or an ON/OFF state of a key, a closed-keys sequence memory having the same number N of words as the channel number for storing channel name, and a processor for writing or reading ON/OFF states of key switches according to information from scanning ON/OFF states of key switches.