JPS6021399B2 - Electronic musical instrument with one finger accompaniment key - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument that can switch rhythm patterns and return to the previous pattern after a predetermined period of time by pressing a key other than the predetermined chord designated key pressed for one-finger accompaniment. .

Rhythm generation circuits in electronic musical instruments have more types of basic rhythms to improve performance effects, and also include rhythms that can be changed. For example, when you press a key for one-finger accompaniment and want to change an automatic performance that starts with a waltz rhythm to a waltz rhythm with a changeable pattern midway through, conventionally, the left-hand accompaniment is interrupted and a variation is set somewhere other than the keyboard.・It was necessary to operate Sui and Sochi.

To explain the conventional electronic musical instrument configuration example shown in FIG. When the instrument is operated, the chord gate 2 opens, 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. Memory ROM 5-1, 5- for use as a rhythm pattern generation circuit
2 is provided, and the rhythm sound source 6 is driven by its output.
For example, when one of the rhythm selection switches 7 corresponding to the waltz is closed, the counter 8 counts the output of the triple time signature system from the output of the pulse oscillator 9, and the output and the ROM selection via the variation switch 10 are used to select the rhythm shown in the figure. In this state, for example, ROM 5-1 is selected, and the pattern reaches rhythm gate loop 4 as a waltz rhythm. The accompaniment chord sound is sent to the speaker 1 via the filter 1 and the amplifier 12.
A voice is emitted from 3. Since the variation switch 10 is usually located at a different position from the keyboard of the one-finger accompaniment key, it is necessary to take one's hand away from 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. An object of the present invention is to improve the above-mentioned drawbacks, and to provide an electronic musical instrument having one-finger accompaniment keys, by pressing multiple keys without taking your hand off the keyboard, you can switch from one rhythm pattern to another and perform a predetermined rhythm pattern. To provide an electronic musical instrument that can automatically return to an original pattern after a lapse of time.

Embodiments of the present invention shown in the drawings will be described below.

FIG. 2 is a block diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts. In FIG. 2, reference numeral 14 denotes a priority circuit which, for example, gives priority to only the lowest-pitched key press in a key press switch operation and transmits it to the code gate 2. Reference numeral 15 denotes a clock pulse oscillator 16, which is a sequential pulse generation circuit; 17, a logic operation circuit; and 18, a key press number detection circuit, for example, which is constructed by connecting two stages of flip-flops.

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.
This is an example of a pulse number greater than -12 by one. 19 is a differential circuit, 20 is a first set/reset type flip-flop, 21 is an AND circuit, and 22 is a second set/reset type flip-flop.

Now, when one one-finger accompaniment key is pressed and one of the interlocking key openings is opened, a predetermined chord chord corresponding to the pressed key is generated via the bass priority circuit 14 and the chord gate circuit 2, and the rhythm It is guided to the speaker 13 in an appropriate rhythm by the selection switch 7.

The logic circuit 17 generates an output pulse only when the corresponding sequential pulses are applied to the output of the key blocker that is linked with one one-finger accompaniment ring, but when the pulse is applied to the key press number detection circuit 18, the output pulse is output. 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, no change occurs in the output of the pressed key number detection circuit 18, so the rhythm pattern does not change. Next, when multiple one-finger accompaniment keys are pressed and the key opening devices close simultaneously or sequentially, the bass priority circuit 14
The output code reaches the output code gate circuit 2 corresponding to the lowest key among the pressed keys to obtain 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 number of pressed keys detection circuit 1
Since the output of the flip-flop Q2 of No. 8 becomes "H" and a trigger pulse is obtained by the differentiating circuit 19, the first flip-flop 20 is set. The output terminal QI becomes "H", and the second flip-flop 22 is in the reset state, and since the output terminal Q2 is "H", the ROM 5
-1 remains selected. Next, when the output of the pressed key number detection circuit 18 is "H" and the counter 8 is in its initial state, that is, at the timing when the counter 8 outputs the pulse of the first beat of the 14th node, the AND circuit 21 operates. Then, the first flip-flop 20 is reset and the second flip-flop 22 is set. Therefore, the output terminal Q2 of the second flip-flop 22 becomes "L" and Q2 becomes "H", so that the ROM 5-2 is selected and a new rhythm pattern is obtained. ．． Afterwards, for example, when the counter 8 tells you the pulse at the end of the second measure, that pulse is
If the flip-flop 22 is reset, R is reset again.
OM5-1 is selected.

ROM5-1 are selected until the final pulse of counter 8,
When the counter 8 returns to its initial state, the key press number detection circuit 18
If the output is "H", ROM 5-2 is selected again. In this way, the pulse calculation state of counter 8 corresponds to the number of beats in a measure, so the timing to select ROM5-2 is to specify the one-finger accompaniment key as a chord just before the end while listening to the pattern in ROM5-1. You only need to press one more key on the treble side other than the key, and there is no need to perform completely synchronized operations. The number of pulses for resetting the second flip-flop 22 may be selected appropriately, and the RO
If a so-called fill-in rhythm is used as the pattern to be stored in the M5-2, it will be effective when using many types of ROM5.

An example of the configuration of the bass priority circuit 14 is shown in FIG.

FIG. 3 is obtained by combining a NAND circuit and a NOR 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. Second
In the case of the embodiment shown in the figure, if the one-finger accompaniment keys are provided for only one octave, it is not possible to press the B note key to obtain a B chord chord and then press the higher note key. In addition, it is better to provide several keys and switches on the higher pitch side and change the pulses etc. one after another.

In this way, according to the present invention, when a rhythm pattern is to be cut, the accompaniment key can be pressed without taking the hand off the one-finger accompaniment key, and the accompaniment key can be controlled by the rhythm pattern counter operation. Since the IJ rhythm pattern can be switched and restored, the performance becomes extremely easy. Brief Explanation of the Drawings Figure 1 is a diagram showing an example of a conventional Kameko instrument that switches rhythm patterns, Figure 2 is a block diagram showing the configuration of an embodiment of the present invention, and Figure 3 is a diagram showing the bass priority in Figure 2. FIG. 3 is a diagram showing an example of a circuit configuration.

1...Key opening/closing device group linked to one-finger accompaniment key, 2...
・Code gate, 3... Sound source circuit, 4... Rhythm gate rephosphorization, (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, 2
0...first flip-flop, 22...second flip-flop.

※·figure meat N crab Figure 3

Claims (1)

[Claims] 1. A chord gate is opened by pressing a one-finger accompaniment key, and an accompaniment chord sound corresponding to the pressed key is derived from a sound source;
A one-finger accompaniment key that reads out a rhythm pattern generation circuit using a counter output, generates a rhythm sound from a rhythm sound source using the readout output, and uses, as an accompaniment sound, an output of a rhythm gate circuit that controls the amplitude of an accompaniment chord sound based on the rhythm pattern. An electronic musical instrument comprising: a pressed-key number detection circuit for detecting the number of pressed one-finger accompaniment keys; a priority circuit for one-finger accompaniment keys provided to open the chord gate; a plurality of rhythm pattern generation circuits; A first flip-flop that is set by the output when the key number detection circuit detects a plurality of pressed keys; and a first flip-flop that is set to the set state when the first flip-flop is in the set state and the counter is in the initial state. a second flip-flop that enters a reset state when the counter counts up to a predetermined value; An electronic musical instrument with a one-finger accompaniment key characterized by switching to a generation circuit.