JPH0730068Y2 - Automatic volume control circuit - Google Patents

Description

[Detailed Description of the Invention] "Industrial application field" The present invention relates to an automatic volume control circuit suitable for application to vocal toys and the like, and in particular, outputs according to the number of vibrations and rotations of the housing. The volume is automatically controlled.

“Prior Art” Among the toys sold for infants, a vocal toy is commercially available.

This toy is a toy in which a power circuit provided inside the toy operates to output a predetermined sound when the power switch is turned on or the casing of the toy is strongly hit. Is.

"Problems to be solved by the invention" In such a conventionally known vocal toy, when a power switch or the like is turned on, a sound generating circuit or the like provided inside is activated to cause a predetermined problem. The sound is output, but the volume is always constant.

If the output state of the voice changes according to the speed of the toy when it is released from the hand of the infant, the infant's interest in the toy becomes stronger than usual,
It becomes even more effective as a toy.

Therefore, in the present invention, such a point is taken into consideration, and in particular, the output volume is automatically controlled according to the number of vibrations and rotations of the housing per unit time. It proposes an automatic volume control circuit.

If this automatic volume control circuit is used inside a vocal toy, the output volume is automatically adjusted according to the number of vibrations and rotations of the case, which can further enhance the interest of the infant. .

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, a sound generation circuit, an attenuator to which a sound output is supplied, a counter for counting the number of vibrations of the housing per unit time, etc. And the attenuation amount of the attenuator is controlled based on the output of the counter.

The “action” counter 35 counts the number of vibrations and the number of rotations of the housing 11 per unit time. The counter output is used for controlling the attenuation amount of the attenuator 32. The attenuator 32 is supplied with the output of the sound generation circuit 30, and the sound generation circuit 30 also receives the control signal related to the mercury switch 21.
Se is supplied. The sound generation circuit 30 is driven immediately after the vibration is stopped in accordance with the number of rotations (the number of vibrations is the same) by rolling the housing 11, and the sound is output via the attenuator 32.

In that case, the attenuation amount of the attenuator 32 is controlled by the output of the counter 35, and the count value of the counter 35 is controlled by the number of rotations of the housing 11. Therefore, for example, the number of vibrations of the housing 11 per unit time is When the number is large, the attenuation amount of the attenuator 32 is controlled to be low and the output volume is controlled to be high.

Further, when the number of vibrations of the housing 11 per unit time is small, the attenuation amount of the attenuator 32 is controlled to increase accordingly, and the output sound volume becomes very weak.

As a result, the output volume can be automatically controlled substantially corresponding to the number of vibrations of the casing 11.

[Embodiment] Next, a case where an example of the automatic volume control circuit according to the present invention is applied to the above-mentioned vocal toy will be described in detail with reference to FIG.

As shown in FIG. 3, for example, a vocal toy is composed of a substantially cube-shaped casing 11, part of which is provided with a power switch 12, and one face of the casing 11, in this example, the upper face.
The speaker 13 faces the 11a.

It is assumed that the power switch 12 and other speakers 13 and the like provided inside the housing 11 are configured so as not to be damaged or come off when the housing 11 is rolled.

FIG. 1 shows a main part of the voicing toy 10, in which an automatic volume control circuit 20 is housed and fixed in a housing 11.

In the automatic volume control circuit 20 shown in FIG. 1, 21 is a mercury switch.

The mercury switch 21 is also attached and fixed to a predetermined position of the housing 11, and is turned on and off repeatedly substantially in response to vibration or rotation of the housing 11.

One end of the mercury switch 21 is connected to a predetermined DC power source + B, and an output signal Sa is obtained from a connection point between the mercury switch 21 and this DC power source (FIG. 2A).

This output signal Sa is a waveform shaping circuit provided in the control circuit 22.
Supplied to 26. The waveform shaping circuit 26 is composed of a diode 24 and a Schmitt trigger circuit 25, and the signal Sa output in association with turning on and off the mercury switch 21 is shaped by the diode 24, and in the Schmitt trigger circuit 25, The Schmitt output Sb corresponding to the operating period of the mercury switch 21 is output (FIG. 2B).

The Schmitt output Sb and the delay output Sc delayed by a predetermined time in the delay circuit 27 (FIG. 2C) are the first NOR circuit 28.
And the NOR output Sd as shown in FIG.

The NOR output Sd and the Schmitt output Sb described above are
Is supplied to the NOR circuit 29 to form the trigger signal Se as shown in FIG. 2E. The trigger signal Se is
The output is almost corresponding to the time when the vibration or rotation of is stopped.

The trigger signal Se is supplied as a trigger signal to the sound generation circuit 30. The voice generation circuit 30 can use a well-known voice generation IC.
For example, very easy to understand everyday words to the infant ( "Hello", "Good evening", a single sentence or this sentence complexed such as "goodbye") is preferable.

The predetermined audio signal output from the audio generation circuit 30 is supplied to the amplifier 34 via the attenuator 32, and the output thereof is emitted from the speaker 13.

The output signal Sa related to the above-described mercury switch 21 is further supplied to the counter 35, and the counter 35 is driven per unit time from the point where the output signal Sa starts to be input. As a result, the count value of the counter 35 is determined according to the number of cycles of the output signal Sa.

For example, as shown in FIG. 2A, when the number of vibrations or rotations per unit time is large, the count value Ca
On the other hand, when the case 11 is rolled weakly, the count value Cb per unit time decreases (F in the same figure).

The counter output determines the amount of attenuation of the attenuator 32. For example, when the counter output is high, the attenuation of the attenuator 32 is small, and sometimes the attenuator 32
Can be selected so that when the counter output is small, the counter output is large.

By doing so, for example, when the number of vibrations per unit time is large as shown in FIG. 2A, the amount of attenuation is small and the output volume is large. On the other hand, when the frequency per unit time is small, the count value Cb also becomes small, so the amount of attenuation at that time becomes large, and in this case, the output volume is controlled to be very weak.

As a result, the level of the output volume is automatically controlled according to the rolling state of the casing 11.

The output of the voice generating circuit 30 is also supplied to the reset circuit 36. The reset circuit 36 has a rectifier circuit 37 as shown in the figure,
After the voice signal is rectified by the rectifier circuit 37, it is supplied to the control transistor Q, and the transistor Q becomes conductive almost in synchronization with the time when the voice output is obtained. Due to this conduction, the reset signal is supplied to the counter 35. Therefore, when the voice generation circuit 30 is driven, the count output of the counter 35 is fixed until then, and the reset state is set.Therefore, the rolling of the housing 11 causes the counter 35 to roll again. The counting operation is started in a state according to the quantity.

In the above, as the vocal toy 10, the output volume is automatically controlled according to the number of times the housing 11 has rolled, but for example, the housing 11 is swung,
By tapping, it is possible to automatically control the output volume according to the swinging speed, the tapping strength, and the like.

Further, the automatic volume control circuit 20 according to the present invention is not applied only to vocal toys, and as described above, it is necessary to adjust the output volume according to the number of vibrations per unit time. Needless to say, it is suitable for application to various electronic devices.

"Effect of Device" As described above, in this device, the number of vibrations per unit time is counted, and the attenuation amount of the attenuator is automatically controlled based on the counter output at that time. .

According to this, the level of the volume that is automatically output can be controlled according to the difference in the number of vibrations per unit time. Therefore, for example, this automatic volume control circuit can be provided inside a vocal toy or the like. If it is stored, attention to the infant will be correspondingly increased, and it is possible to provide a more effective toy.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of an automatic volume control circuit according to the present invention, FIG. 2 is a waveform diagram for explaining the operation thereof, and FIG. 3 is a perspective view showing an example of a vocal toy. 10 …… Voice toy 11 …… Case 12 …… Power switch 13 …… Speaker 20 …… Automatic volume control circuit 21 …… Mercury switch 30 …… Voice generation circuit 32 …… Attenuator 35 …… Counter

Claims (1)

[Scope of utility model registration request] 1. A sound generation circuit, an attenuator to which a sound output is supplied, and a counter for counting the number of vibrations of the housing per unit time, and the attenuation amount of the attenuator based on the counter output. An automatic volume control circuit characterized by being controlled.