Music – Instruments
Patent
1980-05-15
1981-10-27
Truhe, J. V.
Music
Instruments
84 113, G10H 102
Patent
active
042966663
ABSTRACT:
An integrated keyer system for use in electronic organs comprising a plurality of discrete integrated circuit chips each corresponding to two adjacent octaves of the keyboard and connected in series to accommodate the entire keyboard. The keyer system is adapted for use in multiplexed systems wherein the keyswitch closure information is encoded in a time division multiplexed data stream fed through a plurality of the keyer chips, which are connected in series. Each of the keyer chips includes a plurality of tone inputs and outputs and a divide-by-four circuit for lowering the tones in by two octaves. The keyer chips also include serial data inputs and outputs and a demultiplexer for demultiplexing the serial data stream at the serial data input to produce a plurality of control signals corresponding to keydown signals in the serial data stream, which are fed to the individual keyers. The demultiplexer, which may be in the form of a shift register having latches connected between the various stages thereof and the keyers, also serves to delay the serial data stream by two octaves. The keyer chips have their tone inputs and outputs connected in series with the tone input of the first keyer being connected to the tone generator means. The serial data inputs and outputs are also connected in series so that the data stream is fed through the entire bank of chips in series before the data is latched into the keyers. The keyers are of the pseudo sustain type, in which the charge from one capacitor is incrementally transferred to another capacitor to produce the rise and decay for the keying envelope, and are controlled by a pair of counters having variable effective count lengths. The counters are controlled by means of tri-level inputs over a number of the tone input lines. By also connecting the tone inputs and outputs in series and lowering the frequency by two octaves in each chip, the tones feeding the divider/keyer circuit are at the proper frequency for the particular octaves in question.
REFERENCES:
patent: 3544697 (1970-12-01), Munch
patent: 3636231 (1972-01-01), Schrecongost et al.
patent: 3637915 (1972-01-01), Hirano
patent: 3665091 (1972-05-01), Hirano
patent: 3755609 (1973-08-01), Millet et al.
patent: 3902397 (1975-09-01), Morez et al.
patent: 4014238 (1977-03-01), Southard
patent: 4205581 (1980-06-01), Robinson
patent: 4210053 (1980-07-01), Kimura
Lancaster, Music Modules, Popular Electronics, Jun. 1976, pp. 59-66.
Robinson John W.
Wilcox Brian N.
Hoffman John F.
Isen Forester W.
Jeffers Albert L.
Kimball International Inc.
Truhe J. V.
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