JP2513856Y2 - Volume control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a volume control device suitable for application to a radio receiver, a stereo device, etc. having a wake-up function.

"Prior Art" For example, as a radio receiver having a wake-up function, there has been proposed a radio receiver that can appropriately set the volume of the radio when the timer is on, regardless of the volume when sleeping.

An example of this will be described with reference to FIG. 2. The audio signal from the tuner 21 is supplied to the potentiometer 23 through the equalizer amplifier 22, and the volume-adjusted audio signal from the mover 23a is amplified by the power amplifier 24 to produce a speaker.
Given to 25 and heard.

On the other hand, in conjunction with the potentiometer 23, and the DC voltage Vc
The potentiometer 26 to which c is applied is provided, the voltage Va obtained at the mover 26a of the potentiometer 26 is input to the controller 27, and is input to the memory 28 by the operation of the set button (not shown). Voltage Va
Is stored as the set voltage Vb.

Therefore, the user should adjust the potentiometer 23 before going to bed.
The set is completed by operating the and pressing the set button at a volume level suitable for waking up, the next morning, power is supplied to each circuit by turning on the timer 30, and the mover 26a of the potentiometer 26 is supplied.
Then, the controller 27 compares the voltage Va and the set voltage Vb obtained in the above, and the comparison voltage is supplied to the motor drive circuit 31 as a control signal, and the motor 32 rotates forward or backward in the direction in which the comparison voltage becomes O. To be done. As a result, the movers 23a and 26a of the movable contact potentiometers 23 and 26 are moved and stopped when the voltage Va becomes equal to the set voltage Vb. Therefore, it is possible to listen to the radio at a volume suitable for waking up.

In the example of FIG. 3, the potentiometer 26 in the example of FIG. 2 is omitted and the time information is stored in the memory 28. When the set button (not shown) is pressed after adjusting the volume suitable for waking up during setting, the motor
32 rotates in one direction, and the mover 23 of the potentiometer 23
a is moved from the adjustment position toward the ground-side end, reaches the ground-side end, and stops. The moving time Tb from the adjusting position of the mover 23a to the ground-side end at this time is stored in the memory 28. The set is thus completed. After that, you can listen to the radio at any volume.

When the timer 30 is turned on, the motor 32 is rotated in one direction by the control signal from the controller 27, the mover 23a of the potentiometer 23 is temporarily returned to the ground side end, and then the motor 32 is kept for the time stored in the memory 28. Rotates in the other direction, and the mover 23a of the potentiometer 23 is set to the adjustment position. Therefore, even in this example, it is possible to listen to the radio at a volume suitable for waking up.

[Problems to be Solved by the Invention] According to the example of FIG. 2, there is a problem that an encoder such as an independent potentiometer 26 is required for this purpose, and the entire apparatus becomes expensive.

According to the example of FIG. 3, when the sliding resistance of the potentiometer changes due to the change of the environmental temperature and the rotation speed of the motor changes, even if the motor 32 is rotated for the time Tb set in the memory 28 when the timer is turned on, Mover of potentiometer 23
There was a problem that 23a was not set at the set position.

Therefore, the present invention provides a volume adjusting device that solves such a problem.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a sound signal in a normal state to a motor for moving a mover position of a potentiometer and a potentiometer, and a volume of sound when a timer is turned on. A first changeover switch for applying a DC voltage in the set state, a second changeover switch which is interlocked with the first changeover switch and is changed over so as to give an output from the mover of the potentiometer to the amplifier in the normal state, In the set state of the first and second changeover switches, the voltage obtained from the second changeover switch to the mover of the potentiometer is input, and the storage device that stores the voltage as a set voltage and the first and second time when the timer is on. Change the selector switch to the same state as the setting state, and in this state the voltage obtained at the mover of the potentiometer The motor is rotationally controlled until the set voltage stored in the storage device matches, and when the rotation is completed, the first and second motors are controlled.
And a controller adapted to switch the changeover switch of (1) to a normal state.

[Operation] In this configuration, the potentiometer 4 is used both for adjusting the volume in the normal state and for setting the volume when the timer is on. When the timer is on, this potentiometer 4
The motor 12 is rotationally controlled by the voltage obtained at the mover 4a and the set voltage stored in the storage device 9, and the position of the mover 4a of the potentiometer 4 is set at the set position.
Therefore, even if you listen quietly at low volume before bed,
It is possible to wake up reliably by producing a relatively large volume when waking up.

On the contrary, even when listening to the radio at a relatively loud volume before going to bed, it is possible to listen at a quiet volume when the user wakes up, which results in a refreshing wakeup.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIG. This example is an example applied to a radio receiver.

The audio signal from the tuner 1 of the radio receiver is supplied to the equalizer amplifier 2 in the next stage, and its output is given to one fixed terminal 3a of the changeover switch 3. An appropriate DC voltage Vcc from a DC power supply (not shown) is applied to the other fixed terminal 3b of the changeover switch 3. Therefore,
By switching the changeover switch 3, a voice signal or a DC voltage Vcc is obtained at the movable terminal 3c.

Voice signal or DC voltage Vc obtained at this movable terminal 3c
c is supplied to the potentiometer 4, and a voice signal or a direct current voltage downgraded to the mover 4a is obtained, and this is given to the movable terminal 5c of the changeover switch 5. This voice signal or DC voltage is transferred to one fixed terminal 5a by the movable terminal 5.
Alternatively, it is supplied by being switched to the other fixed terminal 5b.

The changeover switches 3 and 5 are interlocked with each other, and in the normal state, the movable terminals 3c and 5c are switched to the fixed terminals 3a and 5a, respectively, as shown by the solid line, and in the set state, the movable terminals 3c and 5c are shown as shown by the broken line. Are switched to fixed terminals 3b and 5b, respectively.

The output from the fixed terminal 5a of the changeover switch 5 is supplied to the power amplifier 6, amplified, and heard from the speaker 7.

The output from the fixed terminal 5b of the changeover switch 5 is input to the controller 8.

Therefore, in the normal state (state of the solid line), the audio signal from the equalizer amplifier 2 is supplied to the power amplifier 6 via the changeover switch 3, the potentiometer 4 and the changeover switch 5, while the volume setting state when the timer is turned on (broken line). State), the movable contact 4a of the potentiometer 4
DC voltage from (Variable by sliding movable contact 4a)
Are input to the controller 8 via the changeover switch 5.

In the setting state, when the potentiometer 4 is set at a certain position and the set button (not shown, for example, connected to the controller 8) is pressed, the voltage Va is input to the memory 9 and stored as the set voltage Vb. It

The timer 10 is turned on when set, and supplies power to the tuner 1, the equalizer amplifier 2, the power amplifier 6, the controller 8, and other necessary circuit parts.

Based on the operation of the controller 8, a control signal is output from this and supplied to the motor drive circuit 11, whereby the rotation of the motor 12 is controlled.

Further, the changeover switches 3 and 5 can be constituted by electronic switches, and when the timer 10 is turned on, the changeover switches 3 and 5 are respectively changed to the broken line state (setting state). When the control is completed, the changeover switches 3 and 5 are switched to the solid line state (normal state). Also, the controller 8
It can also be switched manually via.

Next, the operation of the above circuit will be described. During normal radio reception, the change-over switches 3 and 5 are switched to the solid line state. Therefore, the audio signal from the tuner 1 is supplied to the power amplifier 6 through the equalizer amplifier 2 and the potentiometer 4 and is heard by the speaker 7. The volume at this time is manually adjusted by the potentiometer 4.

To set the volume when waking up, use the speaker 7 described above.
In the listening state from, the potentiometer 4 is manually adjusted to a volume suitable for waking up, then the changeover switches 3 and 5 are changed to the broken line state, and the set button is pushed. As a result, the voltage Va from the potentiometer 4 at that time is input to the memory 9 through the controller 8 and stored as the set voltage Vb.

After the sound volume at the time of waking up is set as described above, the changeover switches 3 and 5 may be switched to the solid line state again to listen to the radio. At this time, the set voltage Vb in the set state
Is stored in the memory 9, the potentiometer 4
Can be moved from the position in the setting state to freely adjust the volume. The above-described operation of switching to the solid line state may be automatically performed by the controller 8.

When the timer 10 turns on and power is supplied to each part of the circuit,
The changeover switches 3 and 5 are switched to the broken line state, and the voltage Va is given to the controller 8 from the movable terminal 4a of the potentiometer 4.

In the controller 8, the voltage Va and the set voltage Vb stored in the memory 9 are compared, and a control signal corresponding to the comparison result is given to the motor drive circuit 11. In response to this, the motor 12 sets the voltage Va to the set voltage. It is rotated forward or backward in the same direction as Vb, and the voltage Va becomes the set voltage Vb.
The rotation of the motor 12 is stopped, that is, the position of the mover 4a of the potentiometer 4 is maintained at the set position.

In this way, after the position of the mover 4a of the potentiometer 4 is controlled, the changeover switches 3 and 5 are switched to the solid line state again by the output from the controller 8, and therefore, the radio is listened to at the set alarming volume. You can

In the above description, the case where the device according to the present invention is used as a so-called wake-up has been described, but the invention is not limited to this, and it is obvious that it can be used as a timer for time notification.

As described above, according to the present invention, one potentiometer is used both for adjusting the volume in the normal state and for setting the volume when the timer is turned on, thus eliminating the need for an independent potentiometer as in the past. There is an effect that it can be configured inexpensively.

Further, when the timer is turned on, the rotation of the motor is controlled by comparing the voltage from the potentiometer with the set voltage in the storage device, so that the movable element position of the potentiometer can be accurately set.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are circuit diagrams showing conventional examples. 1 ... Tuner 3, 5 ... Changeover switch 4 ... Potentiometer 6 ... Power amplifier 8 ... Controller 9 ... Memory 10 ... Timer 11 ... Motor drive circuit 12 ... Motor

Claims (1)

(57) [Scope of utility model registration request] 1. A motor for moving a mover position of a potentiometer; a first changeover switch for applying a voice signal to the potentiometer in a normal state and a DC voltage in a volume setting state when a timer is turned on; A second changeover switch which is interlocked with the first changeover switch and which is changed to give an output from the mover of the potentiometer to the amplifier in its normal state, and in the set state of the first and second changeover switches A storage device that receives the voltage obtained from the second changeover switch to the mover of the potentiometer and stores the voltage as a set voltage; and sets the first and second changeover switches to the set state when the timer is turned on. Switching to the same state, the voltage obtained in the mover of the potentiometer in this state and the storage device The controller controls the rotation of the motor until it matches the set voltage stored in the controller, and when the rotation is completed, switches the first and second changeover switches to the normal state. A volume control device characterized by the above.