JPS6015959B2 - Fade-out time control device for automatic rhythm performance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for automatically gradually reducing the rhythm sound at the end of the rhythm performance of an automatic rhythm performance device, in order to obtain a so-called fade-out effect. The present invention relates to a fade-out time control device for a novel automatic rhythm performance device.

Generally, an automatic rhythm playing device is used to accompany an electronic organ to enliven the flavor of the song, but in this case, the rhythm of the automatic rhythm playing device is A playing method was needed that gradually reduced the volume.

However, in the conventional automatic rhythm performance device, the volume of the rhythm can be varied using a volume adjustment knob.
It is impossible to achieve a fade-out effect by operating this volume adjustment knob during a performance, and it is also impossible to make the tempo and fade-out time proportional.

The automatic rhythm performance device according to the present invention completely solves the above-mentioned problems of conventional automatic rhythm performance devices, obtains a fade-out effect only by switching the switch, and makes the tempo and fade-out time proportional. To provide a fade-out time control device for an automatic rhythm performance device, characterized in that by controlling the fade-out time, the fade-out is made faster when the tempo is fast, and ends slowly when the tempo is slow. It is.

Next, the configuration of the present invention will be specifically explained with reference to the drawings showing one embodiment.

1 is an oscillator {variable resistor 2 for adjusting the tempo}
and a group of flip-flop frequency dividers 3 are connected, and the output signal having a frequency set by the variable resistor 2 is frequency-divided by the group of flip-flop frequency dividers 3.

The above flip-flop frequency divider group 3 is replaced by a matrix circuit 4
A sound source circuit 5, a photocoupler PC, an amplifier 6, and a speaker 7 are connected in sequence to the matrix circuit 4, and a resistor R, which is grounded to the photocoupler PC, is connected in parallel with the amplifier 6 and speaker 7. Then, the frequency-divided signal from the flip-flop frequency divider group 3 is input to the matrix circuit 4 to create a rhythm sound signal, and the rhythm pattern signal excites the sound source circuit 5 to create a rhythm sound signal, and the rhythm blue signal is sent to the photocoupler. - Rhythm music is emitted from the speaker 7 via the PC and the amplifier 6. Flip-flops FF, , FF2, FF3 and flip-flops FF, which are connected in series in three stages to one flip-flop divider of the flip-flop frequency divider group 3 through an AND gate AG,
, FF2, FF3 are connected to resistors R2, R3,
A staircase wave generation circuit 8 consisting of R4 is connected, and the frequency division signal from the flip-flop frequency divider is transmitted to the staircase wave generation circuit 8.
Add to.

The resistors R2, R3, and R4 of the flip-flops FF, FF2, and FF3 are commonly connected to the base of the transistor Q. Connect the collector side of the transistor Q to the power supply +B, connect a capacitor C whose terminal is grounded to the emitter side, and connect resistors R5 and R6 in parallel, and connect the photocoupler PC to the resistor R6 and ground it. The staircase wave signal generated by the staircase wave generation circuit 8 is transmitted to the transistor Q, which controls the lamp current of the photocoupler PC and changes the amount of attenuation of the IJ rhythm blue signal passing through the photocoupler PC. . SW, is a fade-out switch, the movable contact S, is connected to the power supply 10B, and the fixed contact S2 is connected to the grounding resistor R7.
and the above flip-flops FF, FF
2. Connect the reset terminal of FF3 and switch SW above.
When the movable contacts S, , and fixed contacts S2 of , are closed, the flip-flops FF, , FF2, and FF3 are reset and maintain their states, maintaining the state before the start of fade-out.

Each inverting output terminal of the flip-flops FF, FF2, FF3 is connected to a NAND gate NG, and a grounded resistor R8 is connected to the NAND gate NG, as well as to the AND gate AG. As mentioned above, when the movable contacts S and fixed contacts S2 of the switch SW are closed, that is, during performance, a power supply of 10B is applied to the reset terminals of the flip-flops FF, FF2, and FF3. Therefore, flip-flops FF,, FF2,
FF3 maintains a constant state and maintains the state before the start of fade-out.

Next, the movable contact S, fixed contact S of the switch SW,
3 is closed, the flip-flops FF, FF2
, FF3 are in the set state and perform a counting operation, so that fade-out is started.

After that, the resistors R2, R3, R4 of the staircase wave generation circuit 8
When all the outputs input to the gate become low level and the fade-out is completed, all the outputs input to the NAND gate NG are high and the bell is inputted to the NAND gate NG, so a low level is output from the NAND gate NG, so the AND gate AG is in a cut-off state. Therefore, the input signal from the flip-flop frequency divider group 3 is cut off, and the counting operations of the flip-flops FF, FF2, and FF3 are stopped to maintain the state at the end of the fade-out so as not to return to the state before the start of the fade-out. Become.

Now, by operating the tempo adjustment variable resistor 2,
When an output signal having a tempo shown by is oscillated, the frequency is divided by the above-mentioned tempo in the flip-flop frequency divider group 3, the frequency-divided signal is inputted to the matrix circuit 4, and a rhythm is created and vocalized at the above-mentioned tempo. Then, when the movable contact S and fixed contact S3 of the fade-out switch SW are closed just before the end of the performance, the flip-flop FF,
, FF2, and FF3 become set and start counting, the minute signal shown in FIG. 2 A2 from one flip-flop of the flip-flop frequency divider group 3 is
The staircase wave signal shown in FIG. 3A is formed by the staircase wave generating circuit 8, amplified by the transistor Q, and made into an integral waveform by giving the staircase wave signal an appropriate time constant using the resistors R5, R6 and the capacitor C. By controlling the lamp current of the photocoupler PC, the rhythm sound signal passing through the photoconductive cell portion of the photocoupler PC is attenuated, so that the song ends with a feed-out. When the fade-out ends, as described above, the input signal from the flip-flop frequency divider group 3 is cut off, and the state before the start of the fade-out does not return. Next, when an output signal with a tempo farther than the above-mentioned tempo shown in FIG. When the contact S and the fixed contact S3 are closed, the frequency-divided signal shown in FIG. 2 B2 is input to the staircase wave generation circuit 8.
In the staircase wave generation circuit 8, a staircase wave signal shown in FIG. Therefore, the rhythmic green signal passing through the photoconductive cell portion of the photocoupler PC is rapidly attenuated and the fade-out time ends for a short time.

On the other hand, when an output signal with a tempo slower than the above-mentioned tempo shown in FIG. When the contacts S and fixed contact S3 are closed, the frequency-divided signal shown in FIG. 2 C2 is input to the staircase wave generation circuit 8. In proportion to the frequency of the divided signal from 3, a staircase wave signal shown in FIG. The sound signal is slowly attenuated and the song ends with a longer fade-out time. As described above, the present invention creates a staircase wave signal using a frequency-divided signal for creating a rhythm pattern signal, and controls the time at which the rhythm sound decays, that is, the fade-out time. The speed of the rhythm pattern signal,
That is, the tempo is always proportional.

Therefore, when the tempo is fast, the fade-out time is short and the song fades out quickly, but when the tempo is slow, the fade-out time is long and the song fades out slowly, further enhancing the ending effect of the song.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a circuit diagram, FIG. 2 is a waveform diagram showing the relationship between the output signal and the frequency-divided signal,
FIG. 3 is a waveform diagram showing a staircase wave signal. In the drawing, 1 is an oscillator, 2 is a variable resistor for tempo adjustment, and 3 is an oscillator.
is a group of flip-flop frequency dividers, 4 is a matrix circuit,
5 is a sound source circuit, 8 is a staircase wave generation circuit, SW is a fade-out switch, and PC is a photocoupler. Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] 1 The output signal having the frequency set by the tempo adjustment variable resistor is divided by a group of flip-flop frequency dividers to obtain a frequency-divided signal, and the frequency-divided signal is input to the matrix circuit to create a rhythm pattern signal. In an automatic rhythm performance device that excites a sound source circuit with the rhythm pattern signal and outputs a rhythm sound signal, the rhythm sound is generated by a staircase wave signal created by inputting the frequency division signal to a staircase wave generation circuit. A fade-out time control device for an automatic rhythm performance device, characterized by controlling the decay time of a signal.