JPS601635B2 - Rhythm speed determining device in automatic rhythm accompaniment device - Google Patents

Description

[Detailed Description of the Invention] This invention provides an automatic rhythm system that allows musical pieces to be played according to a desired rhythm by opening and closing musical tone signals from a hand/foot keyboard circuit using sequential pulses that match the desired rhythm. The present invention relates to a rhythm speed determining device for an accompaniment device.

Conventionally, this type of IJ rhythm speed determining device used a variable resistor, so after determining the rhythm speed before playing a song, the song was played at this determined rhythm speed, and the rhythm speed was adjusted during the performance. If the rhythm speed is to be made slightly faster or slower, the variable resistor for determining the rhythm speed must be readjusted, and such adjustment during musical performance is very cumbersome.

This invention was made in view of the above-mentioned drawbacks, and it accumulates the time that an input signal is given, holds and outputs a voltage proportional to this accumulated time, and releases the combined voltage for driving the element. When the supply voltage is no longer supplied, it continues to store and hold the voltage proportional to the accumulated time of the input signal at that point, and when the supply voltage is supplied again, the previously stored voltage can be retrieved again,
Furthermore, this memorized voltage can be easily discharged (reset) using a voltage holding element, and the rhythm speed is determined before the music is played. To provide a rhythm speed determining device for an automatic rhythm accompaniment device that can easily speed up or slow down.

The details of this invention will be explained below with reference to the drawings.

First, the characteristics of the voltage storage element used in the rhythm speed determining device in the automatic rhythm accompaniment device according to the present invention will be described. The element symbol of the voltage memory holding element (hereinafter abbreviated as VHD) is shown in Figure 1A, and the operating characteristics are shown in Figures 1B and C.
Shown below. Apply the supply voltage Vcc to the voltage supply terminal, apply the input voltage shown in FIG.
When voltage E is applied, the output terminal Vout gradually increases from time to as shown in Fig. ) is obtained. That is, the input terminal VIN
An output voltage +E proportional to the time T, during which the input signal is applied to the output terminal Vout is obtained at the output terminal Vout, and thereafter, by the -E voltage applied at the time T2 between time ra → ra,
The output voltage gradually decreases and at time t2 the output terminal V
The output voltage of out becomes zero. In addition, a changeover switch SW shown in FIG. 2A is provided on the input terminal VIN side of the VHD,
The changeover contact SWd is connected to the changeover contact SWd, the fixed contact SWa of the changeover switch SW is connected to 1E voltage, the fixed contact SWb is not connected, and the fixed contact SWc is connected to -E voltage, and the time point to in FIG.
→T, time switching contact SWd is set to fixed contact SWa during time t, →t2, T2 time switching contact SWd is set to fixed contact SWb, and T3 time switching is switched from time t2 to t3. If contact SWd is changed to fixed contact SWc,
As shown in the output operating characteristics of FIG. 2B, at time T, an increasing voltage proportional to the time of the signal applied to the input terminals V and N is output to the output state Vout, and at time t,
The input signal is cut off at , and the VHD maintains the voltage 1E proportional to the time of the input signal that has been applied until now for a time T2, and at time t2, the -E voltage is applied as the input signal. After time t a decreasing output voltage is obtained. Also, if the input signal is cut off during the increase or decrease, the output voltage will continue to memorize and retain the output voltage proportional to the time of the input signal that has been applied until now, even if the VHD supply voltage Vcc is cut off. This memorized and held voltage continues to be memorized and held, and when the supply voltage Vcc is supplied again, the previously memorized and held output voltage is outputted again. FIG. 3 is a block diagram of an embodiment of the automatic rhythm accompaniment device rhythm speed determining device according to the present invention. In the figure, 1 is a voltage-controlled clock pulse generation circuit, 2 is a sequential pulse generation circuit, and 3 is a voltage-controlled clock pulse generation circuit.
HD, 4 is a voltage comparator circuit, 5, 52 are first and second flip-flop circuits, 6 is an operating section, 7 is a switch, and voltage-controlled clock pulse generation circuit 1 is used to generate the minimum time unit of the rhythm. A clock pulse is generated, and the oscillation frequency of the clock pulse changes depending on the applied voltage.

The sequential pulse generating circuit 2 is driven by the clock pulse from the clock pulse generating circuit 1 and outputs sequential pulses matching a desired rhythm to terminals 21, 22, . . . 2n.
Output to each. The first sequential pulse is applied to output terminal 2, the second sequential pulse is applied to output terminal 22, etc.
...By obtaining the nth sequential pulse at the output terminal 2n, extracting a musical tone signal from the sound source by operating a hand/foot keyboard circuit (not shown in the figure), and extracting this musical tone signal by opening and closing with the sequential pulse. , automatic rhythm accompaniment matching the desired rhythm is performed. The output voltage of VHD3 controls the oscillation frequency of clock pulse generation circuit 1. The voltage comparison circuit 4 compares the pulses of the output pulses from the first flip-flop circuit 6 and the second flip-flop circuit 52, and when the pulses of the respective output pulses are equal, the drop potential is determined. If the output pulse of the second flip-flop circuit 52 is larger than the output pulse of the first flip-flop circuit 5, the second flip-flop circuit 52 outputs a negative output voltage. When the output pulse is small, a positive output voltage is output, and this output voltage is given to VHD3. First flip-flop circuit3. is inverted by the first sub-order pulse from the sequential pulse generating circuit 2, returns to normal by the next first sequential pulse, and outputs a positive output pulse, and the second flip-flop circuit 52 outputs a positive output pulse. It is inverted by the first output pulse from , and restored by the next output pulse, outputting a negative output pulse. Switch 7 is a second flip-flop.

The operation and non-operation of the top-up circuit 52 and VHD3 are controlled.
The operation section 6 utilizes a clap board that is operated by hands, feet, etc., or a foot keyboard circuit that determines the beat of a piece of music, and when the foot keyboard circuit is used, the bus bar output signal of the foot keyboard switch circuit is used. The operation in the above connection configuration will be explained with reference to the operation waveform diagram in FIG. 4. Switch 7 is OFF
When F, the second flip-flop circuit 52 and VH
D does not operate, and the oscillation frequency of the clock pulse oscillation circuit 1 is determined according to the voltage determined by the variable resistor VR, and this frequency ticks the minimum time unit of the rhythm. Each sequential pulse output terminal corresponding to this frequency 2. , 22...2n. 1st
The flip-flop circuit 5 receives the first sequential pulse shown in the waveform diagram in FIG. The voltage comparator circuit 4 also outputs some output voltage, and this output is given to VHD, but VHD3 is connected to switch 7.
Therefore, no control voltage is applied to the voltage-controlled clock pulse generation circuit 1.
Therefore, the clock pulse generation circuit 1 is connected to the variable resistor VR.
Thus, it oscillates at the tempo speed of the rhythm corresponding to the determined voltage, and automatic rhythm performance is performed according to the determined tempo speed of the rhythm.

Now, suppose that in the middle of a performance, the switch 7 is turned ON to change the tempo speed of the rhythm, and the operation section 6 is operated to obtain a waveform pulse as shown in the waveform diagram in Figure 4 C. , the second flip-flop circuit 52 obtains an output voltage in the negative voltage direction as shown in the waveform diagram of FIG. 4D.

The negative pulse of the second flip-flop circuit 52 and the positive pulse of the first flip-flop circuit 5 are compared in the voltage comparison circuit 4, and, for example, as shown in the waveform a of FIG. The pulses from the first flip-flop circuit 5,
When the pulse from the second flip-flop circuit 52 is in the middle of the pulse, an output voltage in the positive direction is applied to the VHD, and the output voltage from the second flip-flop circuit 52 is compared with the pulse from the first flip-flop circuit 5. When the pulse of the pulse is large, apply a negative output voltage as shown in b of the tree in Figure 4 to VHD3,
If both are in the same pulse, apply zero potential to VHD3↓. The direction and amount of the voltage to be stored are determined by the duration of the positive or negative voltage pulse shown in the waveform diagram of LVHD3', and the stored voltage is output as is. This output changes the oscillation frequency of the clock pulse generation circuit 1.

Therefore, compared to the reference pulse obtained from the first flip-flop circuit 5, the pulse obtained from the second flip-flop circuit 52 corresponding to the beat operated by the hands, feet, etc. of the operation unit 6 is The tempo speed of the rhythm is determined by the length. As mentioned above,
According to the rhythm speed determining device for an automatic rhythm accompaniment device according to the present invention, the tempo speed of the rhythm can be set according to the performer's preference by changing the beat of the operating section operated by hands, feet, etc., with a simple circuit configuration. The tempo speed of the rhythm can be changed to the tempo speed of the rhythm, and the tempo speed of the rhythm can be determined simply by manipulating the beats on the control panel without having to make troublesome tempo speed adjustments during performance. You can expect great performance effects.

[Brief explanation of the drawing]

1 and 2 are diagrams explaining the characteristics of the voltage holding element used in the rhythm speed determining device in the automatic rhythm accompaniment device of the present invention, and FIG. 3 is a diagram illustrating the rhythm speed determining device in the automatic rhythm accompaniment device according to the present invention. FIG. 4, which is a block diagram of the embodiment, is a waveform diagram for explaining the operation of FIG. 3. In the figure, 1......k. 2...Sequential pulse generation circuit, 3...VHD, 4...Voltage comparison circuit, 5...Flip-flop circuit, 6・・・・・・
...Operation unit, 7...Switch. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A clock pulse generation circuit that ticks the minimum time unit of the rhythm, and a clock pulse generation circuit that ticks the minimum time unit of the rhythm, and
A sequential pulse generation circuit that is driven by a pulse and obtains a sequential pulse that matches a desired rhythm, and an automatic rhythm accompaniment device that opens and closes a musical tone signal from a hand/foot keyboard circuit using the sequential pulse from the sequential pulse generating circuit to extract it.
The clock pulse generation circuit includes a voltage controlled oscillator, a voltage memory holding element for controlling the voltage controlled clock pulse generating circuit, a voltage comparator circuit for applying a voltage to the voltage memory holding element, and the sequential pulse generation circuit. a first flip-flop circuit whose pulse interval is determined by the first pulse of a measure and the first pulse of the next measure from the circuit and obtains a pulse waveform corresponding to the pulse interval;
It is equipped with an operating section that is operated by clapping with hands, feet, etc., and a second flip-flop circuit that determines a pulse interval by clapping with hands, feet, etc. of the operating section and obtains a pulse waveform corresponding to this pulse interval. In the voltage comparison circuit, the second flip-flop circuit has a pulse interval determined by the pulse width of the output pulse from the first flip-flop circuit and the operation of the operating section with a hand, foot, etc. By comparing the pulse width of the output pulse from 1. A rhythm speed determining device for an automatic rhythm accompaniment device, characterized in that the tempo speed of a rhythm can be controlled by applying a stored voltage to the voltage-controlled clock pulse generation circuit.