JPS6015960B2 - Fade-out time control device for automatic rhythm performance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a so-called fade-out effect in which the rhythm sound is automatically gradually reduced at the end of the rhythm performance of an automatic rhythm performance device. The present invention relates to a new and highly effective fade-out time control device for an automatic rhythm performance device, which controls the fade-out time.

Nowadays, automatic rhythm playing devices are generally used to accompany electronic organs to enliven the climax of a piece of music. A fade-out device is used to gradually reduce the volume of the sound, and conventionally, as shown in FIG. 4, a photocell P is used between the rhythm circuit RC and the amplifier A.
There was a photocell PC in which the collector side of a transistor Q, which had a switch SW, a resistor R, and a capacitor C connected in parallel to the base side, was connected to the photocell PC.

By the way, in such a conventional device, in a steady state, the switch S
Since W is in the OFF state and the transistor Q is in a non-conducting state, the lamp inside the photocell PC does not light up.
The rhythm signal from the rhythm circuit RC is input to the amplifier A without being attenuated.

Now, in the above conventional device, when the switch SW is turned on, the transistor Q becomes conductive, and the photocell P is turned on according to the time constant determined by the resistor R and the capacitor C.
As the lamp current in C increases, the rhythm circuit RC
The rhythm signal gradually attenuates, giving a fade-out effect. However, in the above follower device, the rhythm tempo and the fade-out time are unrelated, so when trying to change the fade-out time according to the rhythm tempo, the resistance R The drawback is that the time constant of the capacitor C must be adjusted. The device of the present invention has been proposed in order to eliminate the drawbacks of the conventional devices described above, and is not only capable of automatically changing the fade-out time according to the tempo of the rhythm, but also by simply operating a selector switch. Depending on,
The fade-out time can be visually matched to the performance time of any number of measures such as 1 measure, 2 measures, 4 measures, etc. of the rhythm.

Next, FIGS. 1 and 2 show one embodiment of the configuration of the device of the present invention.
3 and 3 will be explained in detail. 1 is an oscillator,
The oscillator 1 includes a tempo adjustment variable resistor 2 and 5 stages of flip-flops FF, FF2, FF3, F connected in series.
F4 and FF5 are connected respectively, and the output signal having the frequency set by the tempo adjustment variable resistor 2 is sent to the flip-flops FF, FF2, FF3, FF4, F.
The frequency is divided by F5.

Thus, the flip-flop FF, . FF2, FF3,
Connect each of FF4 and FF5 to the matrix circuit 3,
The matrix circuit 3 is connected to a sound source circuit 4 "photo cell PC,"
An amplifier 5 and a speaker 6 are connected in sequence, and a resistor R, which is grounded to the photocell PC, is connected in parallel with the amplifier 5 and the speaker 6, and flip-flops FF, FF
2, the frequency-divided signals from FF3, FF4, and FF5 are input into the matrix circuit 3 to create a rhythm blue signal, and the rhythm pattern signal is used to drive the sound source circuit 4 to create a rhythm blue signal.The rhythm blue signal is sent to the photocell PC, amplifier 5, and speaker. It is configured so that rhythm sounds are emitted from 6. SW, is a fade-out time changeover switch, and its fixed contacts S,, S2
, S3, and S4 are the flip-flop FF,
, FF2, FF3, FF4, and the movable contact So is
A staircase wave generation circuit 7 consisting of flip-flops FF6, FF7, FF8 connected in three stages in series via an AND gate AG, and resistors R2, R3, R4 connected to the flip-flops FF6, FF7, F8, respectively. Connect to.

Therefore, by simulating the fade-out time selection switch SW, the flip-flops FF, FF2, F
Any one of the frequency-divided signals from F3 and FF4 is applied to the staircase wave generation circuit 7, and the flip-flops FF6, FF7, and FF8 of the staircase wave generation circuit 7 are operated to generate a staircase wave signal. Become. Next, flip-flop FF
6, FF7, FF8 respective resistances R2, R3, R4
are connected in common to the base of transistor Q,
On the other hand, the collector side of the transistor Q is connected to the power supply +B, and the emitter side is a capacitor C, whose other end is grounded, and a resistor R.
5 and a resistor R6 are connected in parallel, and the resistor R6' is connected to the photocell PC and grounded. Thus, the staircase signal generated by the staircase wave generating circuit 7 is transmitted to the transistor Q, which controls the lamp current of the photocell PC and controls the rhythmic blue signal passing through the photoconductive cell section of the photocell PC. Changes the amount of attenuation.

SW2 is a fade-out switch, whose movable contact S5 is connected to the power supply +B, and one fixed contact S6 is connected to the grounding resistor R7 and to the flip-flops FF8 and F.
Connect the reset terminals of F7 and FF8, and connect the inverted output terminals of the flip-flops FF6, FF7, and FF8 to a NAND gate NG, and connect the NAND gate NG to
It is connected to the grounded resistor R8 and also to the AND gate AG.

Thus, the movable contacts S, fixed contacts S of switch SW2
2 is closed, that is, during performance, the power supply 1B is applied to the reset terminals of flip-flops FF6, FF7, and FF8.
6, FF7, and FF8 maintain a constant state and maintain the state before the start of fade-out. Next, the above switch SW
When the contact between movable contact S5 and fixed contact S7 of No. 2 is closed, flip-flops FF6, FF7, and FF8 are set and perform a counting operation, so that fade-out is started. In this case, the fixed contact S and the movable contact S of the fade-out time changeover switch SW.

If we close the line and use the frequency-divided signal of the flip-flop FF, the time from start to finish of the fade-out corresponds to the time of one measure of the rhythm, and similarly,
When fixed contact S2 and movable contact So are opened and the frequency-divided signal of flip-flop FF2 is used, when fixed contact S3 and movable contact So are closed and the frequency-divided signal of flip-flop FF3 is used, and when fixed contact S4 is used. and movable contact So
If the divided signal of flip-flop FF4 is used with
This corresponds to the times of 4 bars, 4 bars, and 8 bars.
Next, when the outputs input to the resistors R2, R3, and R4 of the staircase wave generation circuit 7 all become low level and the fade-out is completed, all the outputs input to the NAND gate NG are high level, so the NAND gate NC Since a low level is output from FF, the AND gate AG is cut off, and the input signals from the flip-flop frequency divider groups FF, to FF5 are cut off, and the input signals from the flip-flops FF6 and FF5 are cut off.
7. The counting operation of FF8 is stopped to maintain the fade-out end state and not return to the state before the fade-out start.

Now, when the tempo adjustment variable resistor 2 is operated to oscillate the tempo output signal shown by Fo in FIG. 2, the flip-flops FF, FF2, FF3, and FF4 will have
Output signals that are frequency-divided and outputted as shown by F, F2, F3, and F4 in FIG.

In this case, the fade-out time selector switch S
W, is set as the fixed contact S, and when the movable contact S5 and the fixed contact S7 of the fade-out switch SW2 are closed just before the end of the performance, the flip-flops FF6, FF7, and FF8 are set to the counting state due to the above-mentioned configuration. Since the state starts, the staircase wave generation circuit 7 generates the staircase wave signal shown in FIG. 3F in proportion to the frequency of the divided signal shown in FIG. 2F from the flip-flop FF. Q, the step wave signal is amplified by resistors R5 and R6, and capacitor C to give an appropriate time constant to an integral waveform, thereby controlling the lamp current of the photocell PC.

Thus, the rhythm blue signal passing through the photoconductive cell portion of the photocell PC is attenuated, and the song ends while fading out for a time corresponding to one bar.

When the fade-out is completed, flip-flops FF, FF2,
The input signals from FF3 and FF4 are cut off, and the state before the start of fade-out does not return. Next, set the fade-out time selector switch SW to the same state as in the above case, operate the tempo adjustment variable resistor 2, and
If we oscillate an output signal indicated by Fo' in the figure, which has a slower tempo than that indicated by Fo in the above case,
Along with this, a rhythm is emitted at a slow tempo. In this case, when the movable point of the fade-out switch SW2 and the fixed contact S7 are closed just before the end of the performance, the flip-flop FF as shown in FIG.
A staircase wave signal shown in FIG. is attenuated slowly and the fade-out time is longer than in the above case. Conversely, if the apparatus of the present invention is operated by oscillating an output signal with a faster tempo than the above-mentioned tempo, the rhythm green signal will be rapidly attenuated and the fade-out time will be short.

In short, the fade-out time selection switch SW,
When the frequency-divided signal of the flip-flop FF is input to the staircase wave generation circuit 7 by closing the movable contact So and the fixed contact S, the fade-out time is automatically controlled to a time corresponding to one bar, and This time corresponding to one bar changes automatically in response to arbitrary adjustment of the tempo.

Thus, by sequentially closing the movable contact So of the fade-out time changeover switch SW with the fixed contacts S2, S3, and S4, the frequency-divided signals shown in FIG. , Figure 3 F2, F3,
The staircase wave signals shown in F4 are respectively formed, and the lamp current of the photocell PC is automatically controlled, and the fade-out time is sequentially extended to a time corresponding to 2 bars, 4 bars, and 8 bars, respectively, and thus the tempo is varied. Needless to say, the fade-out time is automatically expanded or contracted in response to the bar-equivalent time.

In the device of the present invention, due to the configuration and operation described above,
The fade-out time and the speed of the rhythm pattern signal, i.e., the tempo, are automatically always proportional to the tempo.When the tempo is fast, the fade-out time is shortened in proportion to this, and when the tempo is slow, the fade-out time is proportional to this. This is why the ending effect of the song is so noticeable. In addition, in the device of the present invention, the fade-out time control switch sets the fade-out time to a time corresponding to an arbitrary number of measures of the song being played. The performer can select the time arbitrarily, and the utility in that respect is also great.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the device of the present invention, in which FIG. 1 is a circuit diagram thereof, FIG. 2 is an output signal waveform diagram, and FIG. 3 is a staircase wave signal waveform diagram. FIG. 4 is a circuit diagram of a conventional device. In the drawing, 2 is a tempo adjustment variable resistor, 3 is a matrix circuit, 4 is a sound source circuit, 7 is a staircase wave generation circuit, FF,...
FF2, FF8, FF4, FF5 are flip-flops,
SW, is a fade-out time changeover switch. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. The output signal having the frequency set by the variable resistor for tempo adjustment is divided by flip-flops connected in series in multiple stages to obtain a frequency-divided signal, and the frequency-divided signal is input to a matrix circuit to generate a rhythm pattern signal. In an automatic rhythm performance device that generates a rhythm pattern signal and drives a sound source circuit with the rhythm pattern signal to output a rhythm sound signal, any one of the frequency-divided signals of the flip-flop is inputted to a staircase wave generation circuit via a changeover switch. With the staircase wave signal created at least,
A fade-out time control device for an automatic rhythm performance device, characterized by controlling the decay time of a rhythm sound signal.