JPS5812221Y2 - automatic rhythm playing device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic rhythm performance device that effectively prevents the generation of noise especially when there is no signal.

The automatic rhythm performance device is equipped with an automatic rhythm pulse generator that generates rhythm pulse signals according to the selected rhythm type, and drives multiple types of rhythm sound source circuits using the rhythm pulses released on the market. The rhythm sound source signal from the circuit is configured to be output from the speaker.

Start and stop control of the rhythm performance is performed on the automatic rhythm pulse generator, and is performed by controlling rhythm pulse generation on and off for the rhythm sound source circuit.

but. In such a device, the rhythm sound source circuit and the speaker are always electrically connected, so that noise components generated in the rhythm sound source circuit are supplied to the speaker.

For this reason, the noise level becomes large, especially when there is no signal when rhythm pulses are not generated, resulting in an inconvenience such as sound being emitted from the speaker.

As a means for improving such drawbacks, for example, a means as shown in FIG. 1 can be considered.

Namely. In the automatic rhythm pulse generator 11,
A selected type of rhythm pulse signal is generated by the start/on control of the rhythm control switch 12, and a plurality of rhythm sound sources 13a, 13b, . . . are driven in accordance with the rhythm pulse.

And a rhythm sound source circuit 13a. Rhythm sound source signals obtained corresponding to the rhythm pulses from 13b... are mixed appropriately and taken out via the gate switch 14, and then sent to the amplifier 1.
5, the signal is amplified appropriately and the sound is output from the speaker 16.

In this case, the gate switch 14 is the control switch 12.
The automatic rhythm pulse generator 11 is set to be turned on while the rhythm generation command is present together with the start command, and the gate switch 14 is also opened in conjunction with the rhythm stop command by the opening operation of the control switch 12, and the speaker circuit section and This is to electrically isolate the rhythm sound source section.

By doing this, it is true that noise when there is no signal is not transmitted to the speaker 16 section.

Unnecessary noise can be effectively removed.

However, 1. For example, in a rhythm performance that starts with a start command as shown in Figure 2, if a stop command is issued in the middle of a certain rhythm sound, the decay curve of the last rhythm sound will also be affected along with the stop command. This causes the rhythm player to end in a very unnatural state.

This idea was developed in consideration of the above points, and it is an automatic rhythm play that not only effectively prevents noise generation when there is no signal, but also allows natural stop control even when a rhythm stop command is issued. In this device, a gate circuit is provided in the output example of a rhythm sound source circuit, and this gate circuit is gate-controlled by a signal from a stop delay control circuit that rises with the start control of the rhythm control switch and decays with a time limit with the stop control. It is characterized by

An embodiment of this invention will be described below with reference to the drawings.

FIG. 3 shows its configuration. In the automatic rhythm pulse generator 11, rhythm pulse generation is controlled by a start command and a stop command from the rhythm control switch 12, as in the case of FIG. 1, and the rhythm sound source circuit 13a
, 13b...

And this rhythm sound source circuit 13a. Rhythm sound source signals from 13b... are synthesized, taken out via a gate circuit 17, amplified by an amplifier 15, and supplied to a speaker 16.

Moreover, the operation signal of the rhythm control switch 12 is as follows.

It is supplied to the stop delay control circuit 18, and this circuit 18
In this case, a control signal is generated that rises when the switch 12 is turned on by the start operation and decays with a time limit when the stop control is released.

Then, the gate circuit 17 is gate-controlled by this control signal.

That is, in the automatic rhythm performance device configured as described above, a rhythm start command is issued by turning on the control switch 12, the automatic rhythm pulse generator 11 is activated, and the rhythm sound source circuits 13a, 13b, . . . Drives in response to the rhythm pulse.

In this case, switch 1 is also applied to the stop delay control circuit 18 at the same time.
2, a control signal rises with the start operation as shown in FIG. 4A, and the rhythm sound source circuits 13a and 13 are driven by rhythm pulses as shown in FIG. 4B.
Rhythm sound source signals from b.

This rhythm performance continues while the control switch 120 is turned on.

The automatic rhythm performance progresses in this manner, and when the rhythm performance is to be stopped, the control switch 12 is opened and the operation of the automatic rhythm pulse generator 11 is stopped.

And a rhythm sound source circuit 13a. The rhythm sound source outputs from the rhythm pulse generators 13b, . . . are stopped until the last rhythm pulse from the rhythm pulse generator 11 is reached.

At the same time, the stop delay control circuit 1 is opened by opening the switch 12.
8 is also cut off, but this circuit 18
When the control signal is stopped, the limit signal is attenuated by 5 times with a time limit, and the control signal gradually falls as shown at A in FIG. 4, and the gate circuit 17 is controlled according to this waveform.

Therefore, for example, even if a stop command is generated during the generation of the last rhythm sound source signal, the gate of the gate circuit 17 is closed only after the rhythm sound source signal falls.

The automatic rhythm performance is stopped naturally as shown in FIG. 4B.

Here, the stop delay control circuit 18 may be configured as shown in FIG. 5, for example.

That is, by operating the switch 12, a signal tone of negative potential is coupled to the input terminal in to control the base of the transistor Tr, and when the switch 120 is turned on, the transistor Tr'! Conductivity is established so that an output signal rises at the output terminal OUT.

This is held as long as the input signal exists.

In addition, a parallel grounding circuit consisting of a capacitor C and a resistor R is connected to the emitter circuit of the transistor Tr.
The capacitor CY is charged when the switch 12 is turned on, and the capacitor C is discharged through the resistor RY when the switch 12 is turned off after the switch 12 is opened.

The control signals at the output terminals OU'Iyl-, etc. are attenuated with a time limit.

By the way, in general, the sound source circuit of an automatic rhythm performance device has a high load resistance due to the characteristics of the circuit.
・It is easy to receive mu.

Further, due to the high gain, transistor noise tends to increase. Therefore, in the case where the rhythm sound source without the gate circuit 17 and the speaker circuit are directly connected, the noise when there is no signal is extremely high.

However, according to this invention, when the rhythm performance is stopped, the noise signal circuit to the speaker circuit section is cut off by the gate circuit, so that noise generation is reliably prevented.

At the same time, since the gate circuit is closed with a time limit during rhythm stop control, even the last rhythm note can be clearly expressed, ensuring natural rhythm performance sound control. It is what it is.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a conventional automatic rhythm performance device, FIG. 2 is a diagram showing an example of the rhythm performance sound state of the device, and FIG. 3 is an automatic rhythm performance according to an embodiment of this invention. Figures 4A and 4B are diagrams illustrating the apparatus, respectively showing the states of the gate control signal and rhythm performance sound of the above embodiment, and Figure 5 is a diagram showing an example of the stop delay control circuit of the above embodiment. be. 11...Automatic rhythm pulse generator! , 12...
...Rhythm control switch, 13a, 13b...
... Rhythm sound source circuit, 16 ... Speaker, 17
. . . Gate circuit, 18 . . . Stop delay control circuit.

Claims (1)

[Scope of utility model registration request] A rhythm control m switch that performs rhythm start and stop command operations, an automatic rhythm generator that is activated in response to the start operation of this switch and generates a rhythm sound source signal, and a rhythm sound source signal that is supplied from the automatic rhythm generator. and a stop delay control circuit that generates a control signal that rises under the start control of the rhythm control switch and decays with a time limit under the stop control,
An automatic rhythm performance device characterized in that the gate circuit is controlled by a control signal from this circuit.