JPS589954B2 - rhythm hatsei sochi - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rhythm generating device.

Some conventional electronic organs have a function called automatic accompaniment or autorhythm, and this tempo setting is set by RC.
This is a mechanism that adjusts the oscillation frequency of an oscillator or LC oscillator by adjusting the dial of a variable resistor.

Therefore, to set the tempo of an electronic musical instrument, before the actual performance, play a short phrase while playing the automatic accompaniment (auto rhythm), adjust the tempo by adjusting the dial, and set the automatic accompaniment tempo that matches the desired performance tempo. Set it.

This is a phrase performance that is performed before the main performance, which is not good for both the performer and the jockey, and the tempo set in advance like this means that if the automatic accompaniment is played over the main performance, There is a problem that it is difficult to match the tempo.

Generally, when a band performs without a conductor,
The rhythm part such as the drums precedes the main performance by one measure and starts the rhythm at a predetermined tempo, and then the entire band starts the main performance at the same tempo. There is no discomfort at all.

The present invention attempts to solve the conventional problems with respect to setting the tempo of an electronic musical instrument by incorporating the above-mentioned concept of band performance.
A touch switch that turns N-OFF or a switch with the same effect is provided, and by touching it twice, it has the function of memorizing an arbitrary time interval, multiplying or dividing this time interval to a predetermined ratio, and repeatedly outputting it. To provide a rhythm generator which can start automatic accompaniment overlapping the main performance at the same tempo by touching a touch switch immediately before the main performance at a time interval of one bar or one beat.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, A and B are reset counters as first and second counting means, which are of the same type, for example, a frequency divider composed of multiple or several flip-flops. good.

9 and 10 are clock input terminals 1L12 is a reset input line.

FIG. 2 shows, as an example of a counter, a frequency divider with reset using 10 stages of flip-flops and its counting state.

Each stage output 01 of a 10-stage frequency divider with reset as shown in Figure 2
~010 is counted sequentially from the reset state as shown in Table 1, and can be counted up to 210=1024.

C in Fig. 1 is a switch (opening/closing circuit), which momentarily generates a reset signal when turned on, and sends a reset signal to the counter A via line 11.
It has a function of resetting the counter A and inputting the clock signal from the input terminal 9 to the counter A only while it is turned on.

Touch switches are convenient for opening/closing operations to obtain a predetermined ON time. Figure 3 shows an example circuit of a touch switch that generates an ON signal for a time T by touching it twice with a hand or the like, separated by a time T. Illustrated functions.

In Fig. 3A, F is a conductive touch part, and when it is touched by hand etc., the bi-level signal of line 21 is changed to line 2.
2, the waveform is shaped by a waveform shaping section G including transistors 23 and 24, an additional resistor, and an additional capacitor, and is input to a flip-flop H, and is biased for a time interval T defined by touching the touch switch twice. An output such as the level is obtained from terminal 26.

25 is a bi-level terminal, and 27 is a low-level terminal.

The switch C is driven by the output signal of the terminal 26, and the clock signal can be controlled to be input to the counter A only at specified time intervals.

In Fig. 3, a indicates the timing when the touch switch F is touched twice at an interval of a certain time T, and b indicates the line 22.
C and d indicate the input and output of flip-flop H, respectively.

D in Figure 1 is a comparator that serves as a discrimination means, and compares the outputs of counters A and B, and when they completely match, the output is <1>.
Generates a signal to reset counter B through line 12.

FIG. 4 shows an exclusive OR gate which is an example of a comparator,
As shown in the truth table in Table 2, if inputs X and Y have the same value, <1> is output.

Therefore, as shown in FIG. 5, a plurality of exclusive OR gates 31 to 33 are provided, and the outputs of counters A and H are individually compared, and when all the exclusive OR gates are <1> signals, If only the AND gate 34 generates a <1> signal, it can function as a comparator.

E in FIG. 1 is a waveform synthesizer, which converts the output of the comparator into an appropriate time length and appropriate tone color and outputs it to the output terminal 13.

14 is a forced external reset of counter B.

As for the entire system, the clock φA as the first clock signal input to the input terminal 9 is input to the counter A for a certain short time interval T by the action of the switch C, and the counter A sequentially receives the number of input clocks from O. and when there is no input, it holds the count value, while counter B performs counting using the clock φB as the second clock signal input to the input terminal 10, and the comparator holds the count value. The counted value and the counting state of counter B are compared, and when the two match, a reset signal is sent to line 12 to reset counter B.

The system repeats the above operations. Further, the output is waveform-combined by a waveform synthesizer E and outputted to an output terminal 13 as a suitable waveform.

In other words, the time interval T stored in the counter A by the clock φA input to the input terminal 9 is converted into a time interval T' by the counter B and read out by the clock φB input to the input terminal 10. be.

1 in FIG. 1 is the clock original signal φ.

2 to 4 are frequency divider groups, and 5 to 8 are their terminals.

Now suppose 2 is a 1/2 frequency divider, 3 is a 1/3 frequency divider, and 4 is a 1/2 frequency divider.
It is a 4 frequency divider.

In addition, the clock input of input terminals 9 and 10 is connected to the selective connection circuit F.
It is assumed that the voltage is supplied from terminals 5 to 8.

φ by frequency divider groups 2 to 3 to φA and φB.

If you select the frequency divided signal and connect terminals 5 to 8 and 9 and 10 as appropriate, the ratio of the repetition period of clock φA and clock φB will change relatively, and you can input it by defining it with a touch switch etc. The resulting time interval T is converted at various ratios and output as a time interval T'.

φA. Table 3 shows the selection of the input signal as φB and the output results.

In other words, if φA has a higher frequency, the count value during time T is larger, so it will take more than 1 time to read out with φ8, so the relationship T' = (φA / φB) · T is established. do.

FIG. 6 shows an example of the operation, where a indicates the timing when the touch switch is touched twice at the time interval T, b indicates that the switch C in FIG. 1 is ONL, and C indicates the line 11 in FIG. 1. , d is the clock original signal in Figure 1, and e is the reset signal of
-g indicates the output signal of the comparator of FIG. 1, respectively.

The broken line e - g indicates the timing when a forced reset is momentarily input from the outside through the terminal 14 in Fig. 1, and e is T,
In this example, f is a time signal of T/4 and g is a time signal of 2T.

Next, as an application example, a tempo setting device for automatic accompaniment of electronic musical instruments will be described.

This device is built into an electronic musical instrument, and the touch switch section is exposed to the outside.

Just before the main performance, if you input the length of one measure or one beat by touching the touch switch twice with your hand, this device will immediately play that time interval repeatedly, and the output will be used by the automatic accompaniment device. The automatic accompaniment is performed at a predetermined tempo.

As mentioned above, this device can output a time interval of n times the input, 1/n, so if necessary, you can input a time interval of -measure and output a time interval of one beat, or Conversely, you can input the time interval of one beat and output the time interval of one hand.

Now, just by touching the touch switch before playing, you can set the tempo, and automatic accompaniment will be performed in synchronization with the tempo of the performance.

The capacity of the counter is determined by the length and precision of the input time, but a precision of 0.01 sec and a maximum length of 10 sec is sufficient for practical time used for performance.

Therefore, if a period of 10 stages is used as a counter and a clock original signal of about 100Hz is used, the accuracy is 10 m5ec.
, the maximum length is 210×10m5ec=10.24sec, which is practical.

As described above, according to the present invention, the tempo setting of the automatic accompaniment of an electronic musical instrument can be made simple and accurate, and since the tempo can be set and the rhythm can be started immediately before the actual performance, no tempo deviation occurs, and it is convenient for the jockey. The discomfort disappears.

Furthermore, since the ratio of the repetition periods of the first and second clock signals supplied to the clock inputs of the first and second counting means is relatively appropriately changed, the time interval of -bar can be adjusted as necessary. It is possible to input the time interval of one beat and output the time interval of one beat, or conversely, input the time interval of one beat and output the time interval of one hand, improving the operation of the rhythm generator.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a counter, FIG. 3 is a circuit diagram showing an example of a touch switch and its waveform diagram, and FIG. 5 is a block diagram of an exclusive logic gate, FIG. 5 is a block diagram showing an example of a comparator, and FIG. 6 is an explanatory diagram showing an example of operation. A, B... Counter, C... Switch, D... Comparator, E
... Waveform synthesizer, F ... Touch switch, ■ ... Frequency divider group.

Claims (1)

[Claims] 1 Switch means for passing a first clock signal for a given tempo setting interval, and counting the first clock signal output from the switch means, and turning off the supply of the first clock signal from the switch means. a first counting means that stops the counting operation and holds the count value at that time, and a twenty-ninth counting means that counts the second clock signal;
a determining means that compares the output of the first counting means and the output of the second counting means and repeatedly generates an output each time the output of the second counting means substantially matches the output of the first counting means; means for relatively changing the ratio of the repetition periods of the clock signal and the second clock signal, and by changing the ratio of the repetition periods of the first clock signal and the second clock signal, the tempo is determined by the determining means. A rhythm generating device characterized in that it is configured to generate an output at each time interval obtained by multiplying or dividing a set interval.