US3646242A - Automatic rhythm instrument with cycle-end termination circuit - Google Patents
Automatic rhythm instrument with cycle-end termination circuit Download PDFInfo
- Publication number
- US3646242A US3646242A US124252A US3646242DA US3646242A US 3646242 A US3646242 A US 3646242A US 124252 A US124252 A US 124252A US 3646242D A US3646242D A US 3646242DA US 3646242 A US3646242 A US 3646242A
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- United States
- Prior art keywords
- rhythm
- pulse generator
- cycle
- rhythm pattern
- instrument
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- Expired - Lifetime
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/36—Accompaniment arrangements
- G10H1/40—Rhythm
Definitions
- a prior art device of this nature whose block diagram is illustrated in FIG. 1 is arranged such that predetermined rhythm sounds selected from the various sounds of percussion instruments, or the ordinary tones of chord or bass sounds, or a combinationthereof, generated by rhythm sound sources 11 are derived via keyers 13 triggered by selected rhythm pattern pulses from a rhythm pattern pulse generator 12.
- the rhythm pattern pulse generator 12 comprises a normally open switch l4 manipulated by the player for rendering the device operative and inoperative, a clock pulse generator 15 for generating a basic c'lock pulse having a frequency corresponding to the smallest beat unit (e.g., a quaver) of the rhythm performance, a counter chain 16 including frequency dividers arranged in plural stages and cascade connected to the generator 15, and a rhythm pattern pulse encoder 17 for generating a set of timing pulse trains representing a desired rhythm pattern selected from plural sets of timing pulse trains or rhythm patterns such as the march, rumba, tango and samba, on the basis of a predetermined AND logic combination of the ZERO o r ONE outputs from the counters 16 in their respective stages, thus providing automatic performance of such a rhythm as the repetition of a certain pattern cycle.
- a clock pulse generator 15 for generating a basic c'lock pulse having a frequency corresponding to the smallest beat unit (e.g., a quaver) of the rhythm performance
- the switch 14 In the device of the above-described construction, the switch 14 must be operated at an exact time when the rhythm performance is to be terminated. Failure of proper operation will result in incomplete performance of the music.
- the operation of the switch 14 thus requires greatly delicate timing control which not only requires high skill, but also i tends to a nonnegligible heavy defect obstructive to the multiplicity of performance especially when the device is to be used in combination with an electronic musical instrument 1 such as an electronic organ on which the player is required to use full of his hands and feet.
- the object of theinvention is to provide an automatic rhythm instrument in which the rhythm performance can be continued always to the end of the selected rhythm cycle even if the stop switch is manipulated halfway in the rhythm cycle, whereby desired rhythm performance can be easily made without need of high skill and the multiplicity in the player's simultaneous operation in the case of other musical instrument, such as an electronic instrument, being combinedly used can be further improved.
- FIG. 1 is a schematic circuit diagram of a conventional automatic rhythm instrument
- FIG. 2 is a similar diagram illustrating one embodiment of the instrument according to this invention.
- FIG. 3 is a concrete circuit diagram of the clock pulse generator, counter chain and rhythm termination circuit shown in FIG. 2;
- FIGS. 4A to 4F are waveform charts showing the operating waveforms derived from the circuit portions of FIG. 3.
- rhythm sound sources 21 various percussion instrument (e.g., cymbals, maracas, drum, etc.) sounds, or the ordinary tones of chord or bass sounds or a combination thereof, which are produced by rhythm sound sources 21 are derived via respective keyers 23 triggered by a selected set of rhythm pattern pulses from. a rhythm pattern pulse generator 22.
- rhythm pattern pulse generator 22 e.g., a rhythm pattern pulse generator 22.
- the rhythm pattern pulse generator 22 comprises a normally open switch 24 manipulated by the player at the time of start and stop of the performance to render the instrument operative and inoperative and which function will be described in detail hereinafter, a clock pulse generator 25 for generating a basic clock pulse having a frequency corresponding to the smallest beat unit (e.g., a quaver or a semiquaver) of the rhythm, frequency dividers or a counter chain 26 cascade connected to the generator 25 for counting down submultiples of the frequency of signals from the generator 25, and a rhythm pattern pulse encoder 27 for selectively deriving various sets of rhythm pattern pulses (each set including rhythm pattern pulses for respective rhythm sounds and representing as a combination thereof each one of the rhythm performances on the basis of a preset AND logic combination of the ZERO and ONE outputs from the respective stages of the counter chain 26, said rhythm performances being, for example, the march, rumba, tango, samba, waltz, and bossa nova and each consisting of the repetition of a certain cycle
- rhythm termination circuit 28 for keeping the opened switch 24 shunted by an electronic circuit until the rhythm termination circuit 28 detects the end of the rhythm cycle by effectively utilizing the outputs from the counter chain 26 as will be described later more in detail.
- FIG. 3 is a circuit diagram embodying the clock pulse generator 25, the counter chain 26 and the rhythm termination circuit 28 shown in FIG. 2.
- the clock pulse generator 25 comprises an astable multivibrator 25a in which two transistors TR, and TR 2 areemployed.
- the counter chain 26a comprises plural stages, say four stages of flip-flop circuits FF,, FF FF and FF, (all binaries in this case) cascade connected in turn to the generator 25 and each of the flip-flop circuits FF, to FF, including two transistors TR and TR, (only 0 those in the first stage are designated by the references in the figure).
- rhythm termination circuit 280 comprises and AND-logic-circuit 31 using four diodes D,, D D and D, whose respective cathodes are connected to the ZERO output A ofthe first stage FF, and the each ONE output B, C and D of the remaining second to fourth stages FF, to FF, of the counter chain 26a; a differentiation circuit 32 consisting of a capacitor C, and a resistor R,; and a memory circuit ofa bistable multivibrator 33 in which two transistors TR,, and TR,, are used.
- the respective anodes of said diodes D, to D are connected to a +8 power supply terminal 34 through a load resistor R and to the base of one TR,, of the two transistors included in the bistable multivibrator 33 through the differentiation circuit 32.
- the emitters of the two transistors TR, and TR, constituting the clock pulse generator 25a and the emitters of the corresponding ones included in each group of the paired transistors TR and TR, of the cascade connected flip-flop circuits FF, FF, constituting binary counter chain 26 are directly grounded, whereas the emitters of the remaining ones included in each group of the paired transistors TR, and TR, are jointly connected to the collector of the one transistor TR,, grounded via the switch 24 for resetting the counter.
- the switch 24 is kept open under no rhythm performance, the other transistor TR,, of the bistable multivibrator 33 remains conductive, while the one transistor TR,, remains nonconductive.
- the multivibrator 33 is so designed in advance as to reverse the above-mentioned condition when the switch is closed, that is, to shunt the one transistor TR,, and cause the other transistor TR,, to become inoperative.
- the flip-flop circuits FF, to FF constituting each two half designed in the same way and the binary counter chain 260 remain deenergized.
- the bistable multivibrator 33 Upon the closing operation of the switch 24, however, the bistable multivibrator 33 presents the above-mentioned reversed condition, that is, where the other transistor 'IR becomes nonconductive.
- the emitters of the transistors constituting each half of the flip-flop circuits included in the binary counter chain 260 are grounded through the switch 24 to render the flip-flop circuits energized, thereby being capable of counting operation and in turn the rhythm performances.
- the timing pulse encoder 27 consists of logic circuits including, for example, the known diode matrix having plural inputs and outputs.
- combination pulses from the output tegmhiais A to p on the ONE halves and the output terrninals A B, C, and D on the ZERO halves of the flip-flop circuits are supplied to the corresponding input terminals in a preset combination by the player, then there is produced from the predetermined output terminals trains of pulses constituting in combination a set of rhythm patterns selected from among those representing, for example, the rumba, march, tango, samba and waltz.
- rhythm pattern pulses thus selectively obtained from the encoder 27 are applied to the respective keyers 23 to trigger them.
- various percussion sounds derived from the predetermined ones of the rhythm sound sources are respectively passed through the keyers 23 to sound for the rhythm perfonnance.
- the binary combination pulses A, B, C and D as shown in FIGS. 4A to 4D from the respective stages of the flipflop circuits FF, to FF, are supplied to the corresponding cathodes of the diodes D to D, constituting the AND-logiccircuit 31, which generally gives out no output, except at the last count of the counter cycle when A, B, C and D present positive states.
- This AND-logic-circuit 31 may not necessarily be provided separately, if the encoder 27 includes an equivalent logic circuit therein and the output therefrom is utilized.
- the player opens the switch 24 at any time within the intended last cycle in advance to the end of the cycle.
- An automatic rhythm instrument comprising: rhythm sound sources; keyers for respectively keying the outputs of said rhythm sound sources; a rhythm pattern pulse generator providing pulses of repetitions of rhythm pattern cycles for triggering said keyers, said rhythm pattern pulse generator including switch means to start and stop the operation thereof; and circuit means to permit said rhythm pattern pulse generator to keep on operating even after said switch means is made to stop it, to detect the end of the rhythm pattern cycle and to cease keeping it operating upon detection of said end.
- rhythm pattern pulse generator comprises a clock pulse generator for generating a basic clock pulse having a frequency corresponding to the smallest beat unit of the rhythm, a counter chain connected to said clock pulse generator for counting down said clock pulse, and a rhythm pattern pulse encoder for combining the outputs of said counter chain to make rhythm pattern pulses.
- circuit means comprises an AND logic circuit connected to said counter chain to give out an output at the counter cycle, and a bistable circuit connected to said AND logic circuit to receive the output therefrom and connected to said rhythm pattern pulse generator for rendering it operative even after said switch means is made to stop it and rendering it nonoperative upon receiving the output from said AND logic circuit.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP45021620A JPS5011778B1 (de) | 1970-03-16 | 1970-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3646242A true US3646242A (en) | 1972-02-29 |
Family
ID=12060085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US124252A Expired - Lifetime US3646242A (en) | 1970-03-16 | 1971-03-15 | Automatic rhythm instrument with cycle-end termination circuit |
Country Status (2)
Country | Link |
---|---|
US (1) | US3646242A (de) |
JP (1) | JPS5011778B1 (de) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3760088A (en) * | 1971-04-27 | 1973-09-18 | Nippon Musical Instruments Mfg | Automatic rhythm playing apparatus |
US3764722A (en) * | 1972-06-16 | 1973-10-09 | Conn Ltd C G | Automatic rhythm system providing drum break |
US3803970A (en) * | 1972-04-19 | 1974-04-16 | Nippon Musical Instruments Mfg | Automatic rhythm device with start and stop controller for clock oscillator and a gate |
US3813472A (en) * | 1971-08-20 | 1974-05-28 | Nippon Musical Instruments Mfg | Electronic musical instrument with rhythm selection pulse generator |
US3832479A (en) * | 1972-03-01 | 1974-08-27 | L Aliprandi | Electronic apparatus for programmed automatic playing of musical accompaniment systems |
US3854365A (en) * | 1971-07-31 | 1974-12-17 | Nippon Musical Instruments Mfg | Electronic musical instruments reading memorized waveforms for tone generation and tone control |
USRE28999E (en) * | 1972-06-16 | 1976-10-12 | C. G. Conn, Ltd. | Automatic rhythm system providing drum break |
US4018123A (en) * | 1975-03-20 | 1977-04-19 | Nippon Gakki Seizo Kabushiki Kaisha | Automatic rhythm performing apparatus capable of expressing stressed and relaxed beats of rhythm |
US4299154A (en) * | 1979-08-27 | 1981-11-10 | Kimball International, Inc. | Electronic rhythm generator |
US4987484A (en) * | 1983-03-06 | 1991-01-22 | Canon Kabushiki Kaisha | Halftone image signal processing apparatus in which pixels of a dither threshold pattern are each divided into an operator-selected number of micropixels |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50151210U (de) * | 1974-05-30 | 1975-12-16 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3247309A (en) * | 1962-07-09 | 1966-04-19 | Baldwin Co D H | Semi-automatic rhythm accompaniment |
US3478633A (en) * | 1966-02-07 | 1969-11-18 | Seeburg Corp | Counter resetting arrangement for rhythm accompaniment starting |
US3493667A (en) * | 1962-07-09 | 1970-02-03 | Baldwin Co D H | Semiautomatic rhythm accompaniment |
US3499091A (en) * | 1967-02-10 | 1970-03-03 | Baldwin Co D H | Stepping rhythmic interpolater |
-
1970
- 1970-03-16 JP JP45021620A patent/JPS5011778B1/ja active Pending
-
1971
- 1971-03-15 US US124252A patent/US3646242A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3247309A (en) * | 1962-07-09 | 1966-04-19 | Baldwin Co D H | Semi-automatic rhythm accompaniment |
US3493667A (en) * | 1962-07-09 | 1970-02-03 | Baldwin Co D H | Semiautomatic rhythm accompaniment |
US3478633A (en) * | 1966-02-07 | 1969-11-18 | Seeburg Corp | Counter resetting arrangement for rhythm accompaniment starting |
US3499091A (en) * | 1967-02-10 | 1970-03-03 | Baldwin Co D H | Stepping rhythmic interpolater |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3760088A (en) * | 1971-04-27 | 1973-09-18 | Nippon Musical Instruments Mfg | Automatic rhythm playing apparatus |
US3854365A (en) * | 1971-07-31 | 1974-12-17 | Nippon Musical Instruments Mfg | Electronic musical instruments reading memorized waveforms for tone generation and tone control |
US3813472A (en) * | 1971-08-20 | 1974-05-28 | Nippon Musical Instruments Mfg | Electronic musical instrument with rhythm selection pulse generator |
US3832479A (en) * | 1972-03-01 | 1974-08-27 | L Aliprandi | Electronic apparatus for programmed automatic playing of musical accompaniment systems |
US3803970A (en) * | 1972-04-19 | 1974-04-16 | Nippon Musical Instruments Mfg | Automatic rhythm device with start and stop controller for clock oscillator and a gate |
US3764722A (en) * | 1972-06-16 | 1973-10-09 | Conn Ltd C G | Automatic rhythm system providing drum break |
USRE28999E (en) * | 1972-06-16 | 1976-10-12 | C. G. Conn, Ltd. | Automatic rhythm system providing drum break |
US4018123A (en) * | 1975-03-20 | 1977-04-19 | Nippon Gakki Seizo Kabushiki Kaisha | Automatic rhythm performing apparatus capable of expressing stressed and relaxed beats of rhythm |
US4299154A (en) * | 1979-08-27 | 1981-11-10 | Kimball International, Inc. | Electronic rhythm generator |
US4987484A (en) * | 1983-03-06 | 1991-01-22 | Canon Kabushiki Kaisha | Halftone image signal processing apparatus in which pixels of a dither threshold pattern are each divided into an operator-selected number of micropixels |
Also Published As
Publication number | Publication date |
---|---|
JPS5011778B1 (de) | 1975-05-06 |
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