JPS5812224Y2 - daily rhythm ensouchi - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic rhythm playing device that starts rhythm playing without delay from when a start switch is turned on.

The automatic rhythm performance device, for example, counts a reference tempo signal with a multi-bit binary counter, and uses the counting output signal of this counter to form a rhythm pattern signal corresponding to the reference tempo.This rhythm pattern signal is used to generate a rhythm sound source circuit. It is configured to be able to drive.

In this case, the rhythm start switch controls the start, stop, etc. of the rhythm performance, and in particular, it is required that the rhythm performance be started without delay and with synchronization when the rhythm start switch is turned on.

FIG. 1 shows an example of the automatic rhythm performance device as described above, in which a reference tempo signal is oscillated by a clock oscillator 11,
The clock signal from the oscillator 11 is supplied as a count step signal to a counter 12 which performs, for example, 5-bit binary counting.

Then, the 5-bit count signal from this counter 12 is supplied to a rhythm pattern forming circuit (not shown), and the selected rhythm pattern signal from the selected rhythm pattern forming circuit is used to drive the rhythm sound source circuit. It is something that is driven.

In this automatic rhythm performance device, a signal from a start switch 13 is supplied to a one-shot circuit 14 via a differentiating circuit consisting of a resistor R and a capacitor C, and a one-shot output is generated when the switch 13 is turned on.

Then, by this one-shot output, the cyclic oscillator 1
F and the counter 12 are reset so that the oscillator 11 can be driven to oscillate in synchronization with the switch-on, and the counter 12 starts counting from the beginning so that the rhythm starts counting from the first beat. .

However, in the case of such a device, when the counter 12 is composed of a multivibrator circuit having a capacitor or the like, after the reset command falls due to the one-shot output from the one-shot circuit 14, the ! quickly reversed,
Counting can be started in synchronization with the turning on of the switch 130, but if the counter 12 is configured as an IC, the reset state will continue to be maintained after a reset command is given.

That is, if a signal rises as a result of turning on the switch 130 as shown in A in FIG. 2, the differential circuit output will be generated as shown in FIG. 2B, and the output signal from the one-shot circuit 14 will be as shown in FIG.

The clock oscillator 11 is reset and synchronously controlled by the signal shown in Figure C, and the counter 12 is also reset, and the counter 12 counts the signals shown in D in Figure 2. It is.

That is, the counter 12 starts counting with a delay of time T corresponding to one clock after the switch 13 is turned on, and the first beat of the rhythm performance also starts when the switch 13 is turned on.
) will be delayed by T.

Therefore, it becomes difficult to try to match the performance of other musical instruments, etc., and it becomes difficult to start playing in synchronization with other musical instruments.

This idea was created in view of the above points, and is an automatic rhythm performance device that allows rhythm performance to be effectively started in synchronization with a start switch even when a counter etc. is configured as an IC. The clock oscillator and counter are reset by the one-shot output corresponding to the input of the start switch, and the counter is advanced one step by a delayed pulse signal like the one-shot output mentioned above. shall be.

An embodiment of this invention will be described below with reference to the drawings.

Figure 2 shows its configuration, in which the clock oscillator 11
The oscillation clock signal from the IC is passed through the OR circuit 15K.
The signal is supplied to the converted multi-bit binary counter 12 as a counting step signal.

In addition, the signal when the start switch 13 is turned on is supplied to the one-shot circuit 14 via a differentiating circuit consisting of a capacitor C1 and a resistor R, and is supplied to this stop-shot circuit 14, and the one-shot signal from this one-shot circuit 14 is The output is supplied to the oscillator 11j=- and the counter 12 as a reset signal.

The one-shot output cover from the one-shot circuit 14 is supplied in series to the one-shot circuits 16 and 17, and the output signal from the one-shot circuit 17 is supplied to the OR circuit 15.

By the way, the one-shot circuit 16 is for slightly delaying the output with respect to the input, and the one-shot circuit 17 is for setting the pulse width of the one-shot circuit 16.

That is, if the signal rises as shown in A in FIG. 4 when the start switch 13 is turned on, a one-shot output is obtained from the one-shot circuit 14 as shown in B in the same figure, and the oscillator 11 and counter 12 are reset. As shown in the figure, the oscillator 11 starts to obtain an oscillation output after a time T has elapsed after the one-shot output falls.

In addition, when the one-shot circuits 16 and 17 in figure B are connected, there is a slight delay (for example, 10μ5ee) after the fall of the output shot in figure B.
When the setting is made so that a one-shot output as shown in FIG. 4C is generated, the OR circuit 15 has the output (
The J- and D signals are combined, and the counter 12 reset by the signal shown in Figure B is driven to count as shown by E in Figure 4.

That is, the counter 12 starts counting in response to the turning on of the switch 13, and thereafter counts the clock signal from the oscillator 11, so that the rhythm performance is reliably started from the first beat in synchronization with the turning on of the switch 13. This is what happens.

In this case, the interval between the first count and the second count of the counter 12 is somewhat small, but the difference can be made very small, and there is no practical problem. Even if the circuit is configured in a similar manner, the initial state will be set in synchronism from the start switch, and the rhythm will start to pick up, making synchronized performances with other instruments very effective. 9. Its practical effects are remarkable.

[Brief explanation of drawings]

Figure 1 is a diagram explaining a conventional automatic rhythm performance device;
A to D in the figure are diagrams showing the states of signals in each part of the above device.
Fig. 4 is a block diagram illustrating an embodiment of this invention.
E is a signal waveform diagram illustrating the operation of the above embodiment. 11... Clock output (i & 12------
- Counter, 13...Start switch, 14
．． 16.17...One-shot circuit.

Claims (1)

[Scope of utility model registration request] It is equipped with a clock oscillator that oscillates a reference tempo signal, and an IC-based counter that is incremented by the clock signal from this clock oscillator and generates a count signal for forming a rhythm pattern signal. An automatic rhythm playing device characterized in that the oscillator and the counter are reset by the output, and the counter is advanced one step by a pulse signal obtained by further delaying the one-shot output.