JPS6021400B2 - electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument in which rhythm patterns can be switched by pressing a plurality of one-finger accompaniment keys, and the duration of the switched pattern is varied depending on the number of keys pressed.

Rhythm generating circuits in electronic musical instruments have more types of basic rhythms to improve the performance effect, and also include rhythms that can be varied within the same type of rhythm.

For example, if you wanted to change an automatic performance that started with a waltz rhythm by pressing a key for one-finger accompaniment to a waltz rhythm with a variation pattern, conventionally, the left-hand accompaniment would be interrupted and the variation switch installed somewhere other than the keyboard would be used. It was necessary to operate. To explain the configuration example of the secondary electronic musical instrument shown in FIG. 1, the switch group 1 that is linked with the one-finger accompaniment key is composed of, for example, 1-1 to 1-12. When the instrument is operated, the chord gate 2 is heard, and a predetermined accompaniment chord tone is derived from the sound source circuit 3 and applied to the rhythm gate circuit 4. The rhythm gate circuit 4 performs an operation of chopping accompaniment tones according to a generated rhythm as described later. A memory ROM 5-1.5-2 is provided as a rhythm pattern generating circuit, and the rhythm sound source 6 is driven by its output. For example, when the rhythm selection switch 7 corresponding to the waltz is closed,
The output of the 3-beat system is sent to the counter 8 from the output of the pulse oscillator 9.
, and in the illustrated state, for example, ROM5
-1 is selected, and the pattern reaches the rhythm gate circuit 4 as a waltz rhythm. Accompaniment chord note is Phil 1
1 and an amplifier 12, the sound is emitted from a speaker 13. Since the variation switch 10 is normally provided at a different position from the keyboard of the one-finger accompaniment key, it is necessary to take one's hands off the keyboard in order to operate it. By this operation, the ROM 5-2 operates in place of the ROM 5-1 so that a new pattern of rhythm can be obtained. In this case, it is difficult for beginners to perform the operation by taking their left hand off the keyboard. Furthermore, if there is a desire to obtain a new rhythm pattern, return the rhythm pattern to the original pattern, or switch to another pattern, it is necessary to remove the keyboard each time, which is extremely troublesome. - The purpose of the present invention is to improve the above-mentioned drawbacks, and to provide a method for switching from one rhythm pattern to another by pressing multiple keys without taking your hand off the keyboard in an electronic musical instrument with one-finger accompaniment keys.
To provide an electronic musical instrument that can vary the duration of the pattern depending on the number of keys pressed and automatically return to the original pattern. Embodiments of the present invention shown in the drawings will be described below.

In the block diagram shown in FIG. 2, the same reference numerals as in FIG. 1 indicate the same components. Reference numeral 14 denotes a priority circuit, which gives priority to only the lowest-pitched key press in a key press switch operation and transmits it to the code gate 2, for example.

15 is a clock pulse oscillator, 16 is a sequential pulse generation circuit, 17 is a logic operation circuit, and 18 is a key press number detection circuit, for example, a ring counter capable of counting the number of pressed keys, 4.

The pulses generated from the clock pulse oscillator 15 are sequentially transmitted to the lock opening groups 1-1 to 1 by the pulse generating circuit 16.
The number of pulse trains is one more than -12. 19 is a differentiation circuit, 20 is a selection circuit, for example, consisting of a priority circuit 20-1 and a logic operation circuit 20-2, 21 is a first set-reset type flip-flop, 22 is a second set-reset type flip-flop, 23 is a logic book circuit, 2
4-1, 24-2, 24-3 indicate rectifying and smoothing circuits.

When one finger accompaniment key is pressed and one of the interlocking key opening/closing devices is closed, a predetermined chord chord corresponding to the pressed key is generated via the bass priority circuit 14 and the chord gate circuit 2. The rhythm selection switch 7 generates an appropriate rhythm and guides it to the speaker 13.

The logic circuit 17 generates an output pulse only when the corresponding sequential pulse is applied to the key opening/closing device output linked with one one-finger accompaniment key, but when the pulse is applied to the key press number detection circuit 18, the output pulse Since the reset pulse is sequentially inputted from the pulse generation circuit 16 following the pulse, the key press number detection circuit 18 is reset. Therefore, when one one-finger accompaniment key is pressed, Q2 of the pressed key number detection circuit 18
Since no change occurs in the subsequent output, the rhythm pattern remains unchanged. Next, when multiple one-finger accompaniment keys are pressed and the key openers are closed simultaneously or sequentially, the bass priority circuit 14 outputs the output corresponding to the lowest key of the pressed keys to the chord gate. It reaches circuit 2 and obtains a predetermined chord chord.

For example, when the three keys C, D, and E are pressed, the lowest C
This is the same as pressing only the key, and a C chord chord is obtained. A plurality of outputs are sequentially applied from the logic operation circuit 17 to the key press number detection circuit 18 based on the outputs of the pulse generation circuit 16. Therefore, when two keys are pressed, the output terminal Q2 of the pressed key number detection circuit 18 becomes "H", and the rectifying and smoothing circuit 24
20-1 and reaches the priority circuit 20-1. Priority circuit 20-
1 combines a NOR circuit and an AND circuit so that the output when a large number of keys are pressed, such as 3 keys instead of 2 keys and 4 keys instead of 3 keys, is applied to the logic operation circuit 20-2. Further, pulses having appropriate time differences such as the end of the first bar, the end of the second bar, and the end of the third bar are applied from the counter 8 to the logic operation circuit 20-2. Therefore, when two keys are pressed, the output Q2 of the pressed key number detection circuit 18 is applied to the AND circuit AN-1 of the priority circuit 20-1 and the first flip-flop 21, setting the latter and outputting the output terminal Q21 as " Set to “H”. At this time, the second flip-flop 22 is in a reset state and the output Q22 is "H", so the ROM 5-1 remains selected. Next, when the terminal Q2 of the key press number detection circuit 18 is "H" and the counter circuit 8 is in its initial state, that is, at the timing when the counter 8 counts pulses corresponding to the first beat of the first measure, that state is obtained and logically multiplied. When applied to the circuit 23, the first flip-flop 21 is reset and the second flip-flop 22 is set as a result of the calculation. (
The second flip-flop 22 becomes set. ) Therefore, the output Q22 of the second flip-flop 22 becomes “
L"Q22 becomes "H", ROM (5-2) is selected and a new rhythm pattern is obtained. After that, for example, when the counter circuit 8 is informed of the pulse at the end of the third measure, that state is retrieved. After the calculation is performed in the AND circuit AD-1 of the logic operation circuit 20-2, if it is applied to the second flip-flop 22 and reset (it becomes a reset state), R
OM(5-1) is selected again.

Next, when the counter circuit 8 returns to the initial state, if the two-key pressed state continues and the output terminal Q2 of the pressed key number detection circuit 18 is "H", the ROM 5-2 is selected again. In this way, when the number of keys pressed for the one-finger accompaniment key is R
The period during which OM5-2 is selected is from the 1st beat of the 14th bar to the end of the 3rd bar.

When the number of pressed keys is 3, the output terminal Q2 of the pressed key number detection circuit 18 becomes "H" and then the output terminal Q3 becomes "H".
First, after setting the first flip-flop 21, the priority circuit 20-1 operates, and via the AND circuit AN-2,
It is applied to the AND circuit AD-2 of the logic operation circuit 20-2, and causes the second flip-flop 22 to be reset, for example, at the end of the 24th node and the third node. In this case, the time for selecting the ROMs 5-2 is shorter than in the case of pressing two keys. Furthermore, if four keys are pressed, the selection time of the ROM 5-2 becomes extremely short, such as until the end of the first measure. That is, the counting state is retrieved from the counter circuit 8, and the timing for resetting the second flip-flop 22 allows the ROM
The length of time for selecting (5-2) is determined; for example, in the case of multiple key presses, it can be made shorter. ROM
In step 5-2, a so-called fill-in rhythm can be memorized to improve the performance effect. Bass priority circuit 1
An example of the configuration of No. 4 is shown in FIG.

FIG. 3 is obtained by combining the AND circuit and the /A circuit, and since the outputs from the bass keys are sequentially applied from the upper left side of the figure, it operates as a bass priority circuit. In the case of the embodiment shown in FIG. 2, when the one-finger accompaniment keys are provided for only one octave, it is impossible to press the B note key to obtain a B chord chord and then press the higher note key.
In addition to one octave, it is better to provide several keys and switches on the treble side and change the pulses etc. in sequence.

In this manner, according to the present invention, when changing rhythm patterns, by simply pressing a plurality of keys without taking your hand off the one-finger accompaniment key, the rhythm pattern can be changed under the control of the counter operation for determining the rhythm pattern. Since the return time to the original pattern can be changed as appropriate depending on the number of keys pressed, the performance becomes extremely easy and the performance effect can be improved.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a conventional electronic musical instrument that switches rhythm patterns, Fig. 2 is a block diagram showing the configuration of an embodiment of the present invention, and Fig. 3 is an example of the configuration of the bass priority circuit in Fig. 2. FIG. 1...One-finger accompaniment key and moving lock mechanism group, 2...
・Code gate, 3... Blue source circuit, 4... Rhythm gate circuit, 5-1, 5-2... Rhythm pattern generation circuit, 6... Rhythm sound source, 7... Rhythm selection switch, 8... Counter, 14... Priority circuit, 16...
Sequential pulse generation circuit, 18... key press number detection circuit, 20
... selection circuit, 21 ... first flip-flop,
22...Second flip-flop device. Dislike 1 box connection 2 figure 3

Claims (1)

[Claims] 1 When the one finger accompaniment key is pressed, the chord gate is opened and the accompaniment chord corresponding to the pressed key is derived from the sound source, and the rhythm pattern generation circuit is read out by the counter output that counts the pulse oscillator output, and the rhythm pattern generation circuit is read out by the readout output. In an electronic musical instrument whose accompaniment sound is the output of a rhythm gate circuit in which a sound is generated from a rhythm sound source and an accompaniment chord sound is also amplitude-controlled according to the rhythm pattern, , a first flip-flop which is brought into a set state by the output of a priority circuit for one-finger accompaniment keys, a plurality of rhythm pattern generation circuits, and an output of a number-of-keys-pressed detection circuit that detects that two one-finger accompaniment keys have been pressed, and a one-finger accompaniment key. a selection circuit that obtains an output based on the output of a pressed key number detection circuit that detects that two or more keys have been pressed and a predetermined count value of the counter, and a first flip-flop that is in a set state; a second flip-flop which is in a set state when the counter reaches its initial state and is in a reset state when the output of the selection circuit is generated; the rhythm sound generation is controlled by the set state of the second flip-flop; 1. An electronic musical instrument characterized in that the rhythm pattern generation circuit read out is switched to another rhythm pattern generation circuit, and the rhythm pattern generation circuit is switched to the original rhythm pattern generation circuit when the flip-flop is reset.