JPS6315599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rhythm tempo setting device that can change the rhythm tempo during a performance without any special operation.

In conventional electronic rhythm generators, when setting the rhythm tempo, the desired rhythm tempo is set in advance by manually operating a volume while looking at a display device such as a tempo lamp that indicates the rhythm speed before the performance begins. Ta. However, the visual sense of rhythm caused a discrepancy with the actual sense of rhythm, which caused problems in performance. For this reason, various types of music have been proposed in which the tempo can be set by touching a touch switch or the like with a finger or the like at a desired rhythm speed before the performance starts. According to this, the above-mentioned drawbacks can be eliminated because the tempo can be set with an actual sense of rhythm. However, with any of these methods, in order to change the preset rhythm tempo during a performance, for example, on an electronic organ, it is necessary to stop playing with the left hand and operate the volume control, etc. Since the operations are different from normal performance operations (key operations), it is extremely difficult to obtain a desired rhythm tempo. Changing the rhythm tempo in the middle of a performance is especially necessary when the tempo set before the performance starts does not correspond to the performance, or when the tempo of the piece itself changes during the performance. It's expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rhythm tempo setting device that can change the rhythm tempo during a performance without any special operations.

In order to achieve the above object, the rhythm tempo setting device of the present invention sets a first reference time pulse signal representing the beginning of each measure and a second reference time pulse signal subsequent to the first reference time pulse signal in accordance with a desired rhythm tempo. a rhythm pulse generation circuit that outputs a second reference time pulse signal specifying the immediately preceding time; and a rhythm pulse generation circuit that specifies a time interval from the first reference time pulse signal by pressing a key for a predetermined number of beats, and outputs a key press signal for a predetermined number of beats. a keyboard circuit; a control signal generation circuit that outputs a control signal when a predetermined number of beats of key press signals from the keyboard circuit are input;
and a selection circuit that selectively supplies the second reference time pulse signal to the first or second rhythm tempo setting circuit;
A predetermined time interval from the first reference time pulse signal to generation of the predetermined number of beats key press signal is determined and stored using the first and second reference time pulse signals and the predetermined number of beats key press signal. The first and second rhythm tempo setting circuits output a pulse train according to the time interval, and when the memory contents of the first rhythm tempo setting circuit are being read out by the control signal, the second rhythm tempo setting circuit outputs a pulse train according to the time interval. a switching circuit that alternately switches and selectively outputs the first and second reference time pulse signals to be stored in the rhythm tempo setting circuit; This is characterized in that a frequency pulse train is obtained.

The present invention will now be described in detail with reference to examples.

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention.

In the figure, an initial tempo setting circuit 1 stores a desired rhythm tempo in a rhythm tempo setting circuit 2 before the performance starts, and its pulse output is sent to a rhythm pulse generator 8 via a switching circuit 7 to generate rhythm pulses. A desired rhythm pattern is read from the generator 8, and the rhythm sound source 11 is generated using the rhythm pattern.
Rhythm sounds are derived from and emitted from the audio device 12. The configuration up to this point is the same as the conventional example. In the case of the present invention, the rhythm pulse generator 8 outputs a first reference time pulse signal representing a first reference time, for example, the beginning of each measure, and a second reference time pulse signal specifying a time immediately after the second reference time. The signal is output,
This first reference time pulse signal is applied to the rhythm tempo setting circuit 3 via the selection circuit 6. At this point, the control signal generation circuit 5 is outputting a high (H) level as a control signal. Next, press the key,
For example, when the keyboard circuit 4 outputs a key press signal for a predetermined number of beats (key press signal indicating the second beat) due to the press of the second beat, the rhythm tempo setting circuit 3
The time interval from the reference time to the time when the key press signal of the predetermined number of beats is input is stored, and a pulse train having the period is output. The control signal generation circuit 5 is inverted by the previously output predetermined number of beats key press signal, and its output is low.
(L) level, and the output of the rhythm tempo setting circuit 3 given to the switching circuit 7 is selectively derived. At this point, a rhythm at a new rhythm tempo will occur. At the same time, the selection circuit 6 waits to supply the next first reference time pulse signal from the rhythm pulse generator 8 to the rhythm tempo setting circuit 2. Therefore, when the next first reference time pulse signal is output from the rhythm pulse generator 8, it is given to the rhythm pulse generation circuit 2, and when a key press signal for a predetermined number of beats is output from the keyboard circuit 4,
The rhythm tempo setting circuit 2 stores the time interval from the first reference time to the input of the key press signal for the predetermined number of beats, and outputs a pulse train of the period. At this time, the control signal generation circuit 5 is inverted by the predetermined number of beats key press signal from the keyboard circuit 4, and its output is at the "H" level, and the switching circuit 7 changes the output of the rhythm tempo setting circuit 2. Derive selection. At the same time, the selection circuit 6 selects the next rhythm pulse generator 8.
The rhythm pulse generating circuit 3 waits to receive the first reference pulse signal from the rhythm pulse generating circuit 3. Such an operation is repeated for each bar, and the tempo can be set according to the time interval from the beginning of the bar to the time when the key is pressed on the second beat.

Although the above configuration is usually sufficient, the following more detailed drawbacks have been pointed out. That is,
If you try to increase the tempo of the rhythm pulse generator 8 by pressing the key faster on the second beat, the tempo of the rhythm pulse generator 8 will become faster from that point on as described above, but at the time of pressing the key, the rhythm pulse generator 8
Since the rhythm of the second beat has not yet been recorded, the rhythm will follow with a slight delay. Also, when trying to slow down the tempo of the rhythm pulse generator 8,
If the key depression for the second beat is delayed, the rhythm pulse generator 8 will have already produced the rhythm for the second beat at that point, so the rhythm will be slightly ahead.

In order to solve this problem, the present invention further provides a set circuit 9 and a stop circuit 10 shown in FIG.
Make sure that it is set to the state of the beat. On the other hand, when pressing a key for the second beat is delayed in order to slow down the tempo of the rhythm pulse generator 8, the rhythm pulse generator 8 is pressed for two beats until the key press generates a key press signal for a predetermined number of beats. Wait until just before you want to beat the rhythm, and then start the second beat at the same time as you press the key. That is, the rhythm pulse generator 8 outputs a second reference time pulse signal indicating the second reference time immediately before the second beat, and on the condition that the key press signal for a predetermined number of beats has not been output by that point, the second reference time pulse signal is outputted from the rhythm pulse generator 8. 2 output a stop signal from the stop circuit 10 in response to the reference time pulse signal to stop the operation of the rhythm tempo setting circuit 2 or the rhythm tempo setting circuit 3 in operation, or
Alternatively, the output pulse train is prevented from being input to the rhythm pulse generator 8 from them. Then, the above state is canceled by the subsequent generation of a key press signal for a predetermined number of beats.

FIG. 2 is a detailed example of the circuit shown in FIG. 1, and FIGS. 4a and 4b are diagrams explaining its operation. The explanation will be given below in accordance with FIG. 2 and with reference to FIGS. 4a and 4b.

In FIG. 2, the dashed sections are shown corresponding to the configuration of FIG. First, set the initial tempo before starting the performance as follows. Each time the touch switch 21 is touched, a trigger pulse is generated from the trigger pulse generator 22, and the counter 23 counts. That is, at the first touch, the output of the counter 23 becomes high level "H", the trigger pulse generator 24 generates a trigger pulse, the counter 26 is reset via the OR circuit 25, and the counter 26 starts counting from the beginning. let The high-speed clock of the high-speed clock generator 27 is used as a clock to the counter 26 to the AND circuit 28 (the AND circuit 58 is closed because the output of the T-type flip-flop 57 is low level "L"), the OR circuit 29, and the hexadecimal counter 30. , is given via an AND circuit 31 and an OR circuit 32. Next, when the touch switch 21 is touched for the second time, the output of the counter 23 becomes "L".
At the same time, the output becomes "H" level. Along with this, a trigger pulse is generated from the trigger pulse generator 33, and the trigger pulse is
It is given as a latch pulse to the latch circuit 35 via the OR circuit 34, and the counter 26 at that point is
Latch the contents of. As a result, the value of the counter 26 corresponding to the time interval between the first touch and the second touch of the touch switch 21 is held in the latch circuit 35. The trigger pulse also causes counter 26 to be reset via delay circuit 36. After that, counter 2 is set by the above clock.
6 is counted, and the comparator 37 compares the value with the contents of the latch circuit 35, and outputs a coincidence signal from the comparator 37 at the tempo set above. This match signal is
is applied to the counter 73 through the AND circuit 38,
When the counter 73 counts 3, the RS flip-flop 74 is set and its output Q becomes "H".
level. This counter 73 and RS flip-flop 74 constitute a standby circuit. The reason why this circuit is necessary is that the touch switch 21 has 1
Since only the 3rd and 2nd beats are specified, the 3rd and 4th beats are made to wait. That is, the rhythm generator is actually made to wait from the moment of the second beat until the end of the fourth beat, and therefore operates the rhythm generator from the beginning of the measure.

When the output Q of the RS flip-flop 74 becomes "H" level, the AND circuit 75 is opened and the OR circuit 2 is opened.
The high-speed clock from 9 is passed through, and the OR circuit 32
is used as the clock for the counter 26 via. The reason why this clock is set to high speed is because the initial tempo is set at quarter note intervals, and the output pulses of the comparator 37 also follow these intervals, but this is too long for the clock of the rhythm pulse generator 8. be. Note that a quarter note is usually divided into 12 parts, so
The counter 30 which receives the output of the OR circuit 29 is in decimal notation. In contrast, this time the hexadecimal counter 3
Since a pulse that does not pass through 0 is given, the rhythm clock counts 12 times per beat. At this time, the output of the counter 23 is at the "L" level, so the AND circuit 31 is closed and the output of the hexadecimal counter 30 is blocked. In this way, the high speed clock performs the same operation as before, and the comparator 37 outputs a pulse train to be used as a clock for the rhythm pulse generator 8. The output of this comparator 37 is given to the counter 41 of the rhythm pulse generator 8 via an OR circuit 39 and an AND circuit 40, which generates a rhythm pattern pulse from the rhythm pattern generation circuit 42 and supplies it to the rhythm sound source 11 to generate rhythm sound. Output. At this time, the output of the high-speed pulse generator 27 is the output of the AND circuit 43 and the AND circuit 4.
4. A clock is applied to a counter 49 via an OR circuit 45, a hexadecimal counter 46, an AND circuit 47 and an OR circuit 48, and a comparison is made according to the information previously stored in the latch circuit 50 by the foot key operation. Although pulses are output from the circuit 51, the T-type flip-flop 57 that constitutes the control signal generation circuit 5
Since the output Q of is “L” level, the AND circuit 52
is closed, its output is not given to the counter 41 of the rhythm pulse generator 8.

In the above state, consider the case where the tempo of the rhythm pulse generator 8 is slowed down to follow the operation of the foot key.

FIG. 4a is an explanatory diagram showing the transition in this case. That is, with respect to the initial rhythm pulse, at time point X in a of the same figure, the rhythm pattern generation circuit 4
When the second to first pulse is output, that pulse passes through the AND circuit 53 and the OR circuit 54, resets the counter 49, and starts counting from the beginning. Next 2
When a pulse indicating just before the beat is output, the SR flip-flop 56 in the stop circuit 10 is reset via the AND circuit 72 and the AND circuit 55 constituting the stop circuit 10, and its output Q is set to the "L" level. Therefore, the AND circuit 28 is closed, the high-speed clock is blocked, the rhythm tempo setting circuit 2 stops operating, and the supply of the clock to the counter 41 of the rhythm pulse generating circuit 8 is interrupted. This point corresponds to section Y in FIG. 4a. Then, when the second beat is played with the foot key 59, a trigger pulse is generated from the trigger pulse generator 60, and since the first beat has been played first, the output of the counter 61 is set to the "H" level. shall be. As a result, a trigger pulse is generated from the trigger pulse generation circuit 62, thereby causing the contents of the counter 49 to be transferred to the latch circuit 50.
latch on. At this point, the time interval _T1 shown in FIG. 4a is held in the latch circuit 50.
The trigger pulse inverts the T-type flip-flop 57 to the "H" level and provides a high speed clock to the counter 49 via the AND circuit 63. in this case
The output of the hexadecimal counter 46 is blocked by an AND circuit 47. At the same time, the trigger pulse resets the counter 49 via the delay circuit 64, and a rhythm clock is output from the comparator 51 in response to a subsequent clock input. At this point, the output of the T-type flip-flop 57 is at "H" level, so the AND circuit 52 is open, and conversely, the AND circuit 38 is closed.
The pulse train from the rhythm tempo setting circuit 2 is blocked, and the pulse train from the rhythm tempo setting circuit 3 is newly input to the rhythm pulse generating circuit 8, thereby setting a slow tempo. Further, the trigger pulse sets the RS flip-flop 56 via the OR circuit 65 and sets its output to the "H" level, so the AND circuit 28 is opened, and the output of the T-type flip-flop 57 is also "H", so the AND circuit 28 is opened.
Circuit 66 is opened so that the signal from hexadecimal counter 30 is applied to counter 26. At this time
AND circuit 31 is closed. Also, AND circuit 67
The next one from the rhythm pattern generation circuit 42 also opens.
Prepare for the second pulse input.

Next, consider the case where the tempo of the rhythm pulse generator 8 is increased. FIG. 4b is an explanatory diagram showing the transition in this case. That is, when the first beat pulse is output from the rhythm pattern generation circuit 42 at time X' in FIG.
The counter 26 is reset and counted from the beginning. Next, if you operate the second beat with the foot key 59 before the pulse immediately before the second beat is output, the counter 61
The output of the counter becomes "H" level, a trigger pulse is generated from the trigger pulse generating circuit 62, and the contents of the counter 26 at that time are latched in the latch circuit 35. At that point, the T-type flip-flop 57 is inverted and its output becomes "L" level. Therefore
Since the AND circuit 66 is closed and the AND circuit 31 is open, a high-speed clock is applied to the counter 26, which outputs a pulse train from the comparator 37 according to the stored contents of the latch circuit 35, and passes the rhythm pulse through the AND circuit 38. The signal is input to the generating circuit 8. At this time, the trigger pulse signal is further applied to the set circuit 70 or 9, and the counter 41 is forcibly set to output the second beat state, that is, the 13th pulse. This allows the rhythm to perfectly follow the foot key operations.

FIG. 3 shows a detailed circuit example of the set circuit 9.
As shown in the figure, it consists of eight cascade-connected RS flip-flops C ₁ to C ₈ that supply the 8-bit count value of the counter 41 to the rhythm pattern generation circuit ₄₂ in response to a trigger _pulse. For C ₂ to _{C 4} and C ₆ , a trigger pulse and a stop signal are applied to the R terminal via the OR circuit, and for C ₇ and C ₈ , a trigger pulse and a stop signal are applied to the S and R terminals, respectively. A circuit 70 is provided to apply a trigger pulse to the R terminal, the lower 6 bits are forcibly set to "010001", and counting is performed on the clock. It can be seen that with this configuration, it is possible to set the state to indicate the second beat in each bar. Note that the counter 41 in the figure can count four measures. The end of one measure, ie, the 48th pulse, is output when the value of the counter 41 is "01000000". In this case, before the 12th pulse is output from the rhythm pattern generation circuit 42, the foot key is operated for the second beat, and the output of the counter 41 is at the "H" level.
The stop circuit 10 does not operate.

Of course, if you operate the foot keys in sync with the rhythm,
The same time interval is always stored alternately in the rhythm tempo setting circuit 2 and the rhythm tempo setting circuit 3, pulses corresponding to the time intervals are output, and the tempo does not change.

In the above explanation, the rhythm pattern generation circuit 42
The first pulse indicating the beginning of the measure was used as the reference pulse from the time, and the second beat was used to set the tempo with the foot key, but the time interval from the reference time can be set. All you have to do is For example, a pulse indicating the end of a bar from the rhythm pattern generation circuit 42 may be used, or a foot key operation at the third beat may be used.

In the above configuration, the tempo can be changed for each measure, so if the foot keys are not operated, the rhythm will stop, but as shown in the lower left of Figure 2, an RS flip-flop 68 is used. This makes it even easier to play. In other words, a switch 69 is provided on the expression pedal of an electronic organ or any key, and when this switch is operated, the RS flip-flop 68 is set so that the rhythm tempo can be changed only in response to foot key operations within that measure. and when not operated, the output of the counter 61 and the output of the rhythm pattern generation circuit 42 are blocked by the AND circuits 71 and 72,
The rhythm continues at the previous tempo.

At the end of the rhythm performance, if the touch switch 21 is touched once, the output of the counter 23 goes to the "H" level, which resets the RS flip-flop 74 constituting the standby circuit and sets its output Q to the "L" level. The circuit 40 is closed and no clock is supplied to the rhythm pulse generating circuit 8, which stops.

As explained above, according to the present invention, the tempo of the rhythm pulse generator can be changed by following the same operation as in normal performance, for example, the operation of the foot keys, so that the tempo can be changed during the performance. To easily and freely obtain a tempo that matches the performance. Furthermore, as described above, when slowing down or speeding up the tempo, it is possible to eliminate the discrepancy between the key press on the second beat and the timing of the change, giving a sense of stability to the operation.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention,
2 is a detailed circuit example of the embodiment shown in FIG. 1, FIG. 3 is an explanatory diagram of the main part circuit of FIG. 2, and FIG. 4 is an explanatory diagram of the operation of the embodiment of FIG. is an initial tempo setting circuit, 2 and 3 are rhythm tempo setting circuits, 4 is a keyboard circuit, 5 is a control signal generation circuit, 6 is a selection circuit,
7 is a switching circuit, 8 is a rhythm pulse generator, 9 is a set circuit, and 10 is a stop circuit.

Claims (1)

[Scope of Claims] 1. A first reference time pulse signal indicating the beginning of each bar corresponding to a desired rhythm tempo, and a second reference time pulse signal specifying a point immediately before a second reference time after the first reference time pulse signal.
a rhythm pulse generation circuit 8 that outputs a reference time pulse signal; a keyboard circuit 4 that specifies a time interval from the first reference time pulse signal by pressing a key for a predetermined number of beats and outputs a key press signal for a predetermined number of beats; a control signal generating circuit 5 that outputs a control signal when a key press signal of a predetermined number of beats is inputted from the keyboard circuit; a selection circuit 6 selectively supplying the rhythm tempo to the first or second rhythm tempo setting circuit; first and second rhythm tempo setting circuits 2 and 3 that determine and store a predetermined time interval until the generation of the several key press signal and output a pulse train according to the time interval; When reading out the memory contents of the first rhythm tempo setting circuit, the second rhythm tempo setting circuit
a switching circuit 7 for alternately switching and selectively outputting the first and second reference time pulse signals so as to store them in a rhythm tempo setting circuit; A rhythm tempo setting device characterized in that a pulse train of a corresponding frequency is obtained. 2. A set circuit 9 that forcibly sets the state to the second reference time by the beat number key press signal, and if the predetermined number of beat key press signals are not output by the second reference time, the set circuit 9 sets the state until the predetermined number of beat key press signals are output. means 10 for stopping the output from the first or second rhythm tempo setting circuit in response to the second reference time pulse signal, and supplying the output of the switching circuit as a clock to the rhythm pulse generator 8. A rhythm tempo setting device according to claim 1. 3. A set circuit 9 that forcibly sets the state to the second reference time by the beat number key press signal, and if the predetermined number of beat key press signals are not output by the second reference time, the set circuit 9 sets the state until the predetermined number of beat key press signals are output. means 10 for stopping the output from the first or second rhythm tempo setting circuit in response to the second reference time pulse signal, supplying the output of the switching circuit as a clock for the rhythm pulse generator 8; 68 and 69 are provided, and when the switch means is operated, the second reference time pulse signal from the rhythm pulse generator 8 is supplied to the stop means 10 only within the operated measure, and a key press signal for a predetermined number of beats is set. 2. The rhythm tempo setting device according to claim 1, further comprising control means for enabling supply to the circuit 9 and for blocking said supply in measures in which said switch means is not operated.