JPS5937840Y2 - onomatopoeic circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an onomatopoeia circuit that generates a unique sound by itself or when attached to an electronic musical instrument, a toy, etc., and particularly relates to an onomatopoeia circuit that creates the waveform of a train horn sound.

Conventionally used devices for producing train horns have prepared a whistle that emits the same sound as the real horn, and made the whistle sound by passing air under a certain pressure through it.

Therefore, in addition to a container for compressed air and an air valve, it is necessary to separately prepare an operating valve, which is quite troublesome, and there has been a demand for simplification.

In addition, the sound of a train's horn is easy to understand as a horn when it emits two short and long sounds, ``Boppo,'' but conventional onomatopoeic devices only make one sound, ``Bo,'' to simplify the structure. .

The purpose of the present invention is to provide an onomatopoeia circuit that generates the sound of a train horn using an electronic circuit with a simple configuration and generates the sound with two short and long tones that are easy to understand as the horn sound.

In order to achieve the above object, the onomatopoeia circuit of the present invention includes a pulse generation circuit that generates a plurality of pulses by operating a switch,
The output pulses of the pulse generation circuit are combined to produce short pulses at predetermined intervals.
A circuit that forms an envelope waveform based on two long pulse widths, an unstable multivibrator that supplies the envelope waveform output of the circuit as a power supply voltage, and a low-pass filter that passes the oscillation output of the astable multivibrator. It is characterized by this.

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

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

An overview of the configuration will be described using a block diagram. In the same figure,
By operating the switch circuit 11, a pulse generating circuit 12 having three pulse generators generates pulses.

These pulses are converted by the logic gate 13 into signals having short and long pulse widths spaced at predetermined intervals, which are the basis of the envelope of the horn sound, and are made to have a predetermined time constant for the rise and fall of the pulses. An envelope waveform is obtained.

By giving the envelope waveform output thus obtained as the power supply voltage of the astable multivibrator 14,
The unstable multivibrator 14 oscillates only in the section corresponding to the two pulses of the envelope voltage signal.

The oscillation output waveform of the astable multivibrator 14 is a rectangular wave, and this signal is passed through a low-pass filter 15 to
A commanding horn signal can be obtained from the major 2 tones.

FIG. 2 shows an example of a specific circuit corresponding to the configuration shown in FIG. 1, and FIGS. 3a to 3g are waveform diagrams showing its operation.

The following will be explained in accordance with FIG. 2 and with reference to FIG. 3.

Note that the range indicated by the broken line in FIG. 2 corresponds to the block in FIG. 1.

The configuration shown in FIG. 2 will be outlined below, and its operation will be explained with reference to FIGS. 3a-j.

In FIG. 2, the switch circuit 11 is connected to the switch 21.
It is connected from one end to the NOT gate 22 and time constant circuits C1 and R1 via a resistor R4.

Pulse generation circuit 12 is NOT game 1-23.24.25
Time constant circuits C2, R2 and C3, R3 are provided between
It branches off from the input of NOT gate 22 and is connected to the output of NOT gate 23 via diode D1.

The output of the NOT gate 23 and the output of the NOT gate 25 are passed through a negative logic OR gate 13 connected to the base of a transistor 28 via diodes 26 and 27, respectively, and then passed through an unstable multivibrator 14 to a low-pass filter 15. sent to.

The operation of the above configuration will be explained using FIGS. 3a to 3j.

When the switch 21 in Fig. 2 is open, ■◎ is +
(2) potential, and the output (2) of the NOT gate 23 is also the same.

At this time, no current flows through the diode D1.

When the switch 21 is closed, both ■ and ◎ have the same potential as G (0
potential), and the output O of the gate 22 becomes +■ potential.

At that time, the output ■ of the NOT gate 23 becomes 0 potential.

After that, it is discharged according to a time constant determined by the capacitor C1 and resistor R1 between 050 and 050 (see a and b in the same figure).

The potential of ◎ is kept at 0 potential because current flows through resistor R4 and diode D1, and it continues until the potential of ○ passes the threshold potential of NOT gate 23 and NOT gate 23 is reversed.
(See the same figure).

As a result, the output {circle around (2)} of the NOT gate 23 becomes as shown in FIG. 3C.

In this way, the part operates as a monostable multivibrator (see a-c in the same figure).

The output ■ of the NOT gate 23 further passes through a differentiating circuit consisting of C2 and R2, inverts the NOT gate 24 output (G) (0 potential), discharges it for a time determined by C2 and R2, and further increases when it passes the threshold potential. Inversion (+V potential) (see figure d)
As a result, the waveform shown in FIG. 3e is obtained.

Similarly, the output waveform (■) of the NOT gate 25 is also C3, R
3 (see f in the figure), and as a result, a waveform as shown in Fig. 3 is obtained.

Here, when the output 2 of the NOT gate 23 and the output 2 of the NOT gate 25 are manually inputted to the negative logic OR gate 13 consisting of the diode 26, 27 and the transistor 28, the output waveform shown in FIG. 3 is obtained.

In the circuit shown in Figure 2, the length of the short tone, the length of the break between the short tone and the long tone, and the length of the long tone are determined by the time constants C1°R1 and C2, respectively.
, R2, C3, and R3 to obtain a desired envelope, and has the effect that the opening/closing of the switch 21 does not affect the first short tone section of the envelope.

FIG. 4 shows another example of a specific circuit corresponding to the configuration shown in FIG. 1, and FIGS. 5a to 5k are waveform diagrams showing its operation.

In FIG. 4, the switch circuit 11 connects the ground side terminal of the switch 41 to the NOR circuit 42, and connects the time constant circuit C'1. R'1 is provided, and the output of NOT gate 43 is sent to NOT gate 44 and returned to NOR circuit 42.

On the other hand, the output of the NOR circuit 42 is branched to the time constant circuit C'2.
R'2 is provided in the NOT gate 45, and a time constant circuit C'3. It is sent to NOT gate 46 via R'3.

The output of the NOT gate 44 and the output of the NOT gate 46 are then passed through a NOR circuit 47 (OR gate 13) and sent to the low-pass filter 15 via the unstable vibrator 14.

The operation of the above configuration will be explained using FIGS. 5a to 5k.

When the switch 41 is open, the NOR gate 42 is powered by ■
(It is at O potential.

On the other hand, since the potential of the human input (2) of the NOT gate 43 is +V, its output is 0 potential, and the output of the NOR gate 42 is +2 potential.

When the switch 41 is closed, the human power ■ of the NOR gate 42 becomes +V and the output of the NOR gate 42 changes to O potential, so the output of the NOT gate 43 becomes +V and the NOR
The output @ of the gate 42 is held at O potential (a-
(see d).

Here, the human power potential of the NOR gate 43 is discharged by the time constant of the differentiating circuit composed of C'l and R'l, and when this potential passes the threshold potential of the NOT gate 43, the output ■ of the NOT gate 43 is reversed. The potential becomes 0 (see the same figure)
.

During this time, regardless of whether the gate 41 is opened or closed, the NOT gate 4
The output of No. 3 holds the +V potential.

The above part operates as a monostable multivibrator (see a to d in the figure).

The output cull waveform of the NOT gate 43 is as shown in FIG. 5C.

The output ■ of the NOR gate 42 is further C'2. Passing through a differentiating circuit with a time constant of R'2, the output ■ of the NOT gate 45 becomes +■ potential (e-g in the same figure).

And C'2. After discharging with a time constant determined by R'2, when the human power (2) of the NOT gate 45 exceeds the threshold potential, the output (2) is inverted and becomes 0 potential, and the output shown in FIG. 5g is obtained.

Similarly, the output of NOT gate 46 is C'3. It is determined by the time constant R'3, and the waveform shown in Figure 5 is obtained.

By inputting the output of the NOT gate 44 and the output of the NOT gate 46 to the NOR gate 47, the waveform shown in FIG. 5i is obtained at the output (2).

In this example, in order to set the length of all envelopes for short notes, breaks, and long notes at the beginning, switch 4 is set in the middle.
This has the effect of not being affected even if 1 is opened or closed.

As explained above, according to the present invention, multiple output pulses of the pulse generation circuit are combined to form an envelope waveform based on two short and long pulses, and this is used as the power supply voltage of the unstable multivibrator. It passes the oscillation output through a low-pass filter and outputs a horn sound signal similar to that of an actual train horn.

These can be realized with simple and small electronic circuits, and because they generate a sound similar to an actual horn with two easy-to-understand short and long tones, the impression they leave on the listener is rather unfavorable. It becomes something.

Since it uses an electronic circuit, it goes without saying that it can be made smaller, and it is also much easier to handle and operate.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of an embodiment of the present invention, Figure 2 is a specific circuit example corresponding to the configuration in Figure 1, Figure 3 is a waveform diagram showing its operation, and Figure 4 is the configuration of Figure 1. 5 is a waveform diagram showing its operation, and in the figure, 11
12 is a switch circuit, 12 is a pulse generation circuit, 13 is a logic gate, 14 is an astable multivibrator, and 15 is a low-pass filter.

Claims (1)

[Scope of utility model registration request] A pulse generation circuit that generates a plurality of pulses by operating a switch, a circuit that combines the output pulses of the pulse generation circuit to form an envelope waveform based on two pulse widths of short and long at predetermined intervals, and an envelope waveform of the circuit. An onomatopoeic circuit comprising: an unstable multivibrator that provides an output as a power supply voltage; and a low-pass filter that passes the oscillation output of the astable multivibrator.