JPS63197108A - Gain adjusting device - Google Patents

Abstract

PURPOSE:To always obtain a desired gain level automatically by one touch by outputting a deviation signal returning a gain level preset at present to a preset gain level while a motor is subject to drive control. CONSTITUTION:A set gain level is converted into a position signal by detecting the position of a slider of a variable resistor 2 by an encoder 10 and the position signal is kept by a holding circuit 12. Even when the gain level is fluctuated, while the set gain level is held, it is compared with a present gain level by a comparator circuit 13, and when the both have a difference, a motor 3 is driven to restore the present gain level to the set gain level. Thus, the operability at gain adjustment is improved and the desired gain is obtained automatically by one touch.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a gain adjustment device, and particularly to a gain adjustment device that improves operability during gain adjustment and is useful for setting a predetermined gain level with one touch. Regarding equipment.

[Conventional technology]

Automated gain adjustment devices used to adjust the volume of remote control televisions, remote control stereo devices, etc. conventionally include electronic volume controls and electric volume controls as shown in FIG.

An electronic volume does not use a variable resistor, but instead uses an electronic circuit to provide the same function as a variable resistor. On the other hand, the electric volume uses variable resistor 2, and this variable resistor 2
A motor 3 is used to rotate and slide the gain to obtain a predetermined gain level.

Figure 3 is a block diagram showing a conventional rotary electric volume, which includes a variable resistor 2 that works in conjunction with an adjustment knob 1 to change the resistance value according to the rotation angle, and a variable resistor 2 that is driven to rotate by a predetermined angle. The main parts of the motor 3 include a stepping motor or the like, and a drive circuit 4 that supplies a drive signal S1 to the motor 3.

The adjustment knob 1, the variable resistor 2, and the motor 3 have the same axis, and are connected by a knob shaft 5a and a motor shaft 5b. Two rings 6.6 are interposed in the middle of the motor shaft 5b and are in pressure contact with each other. By manually rotating the adjustment knob 1, the rings 6.6 are easily released from the pressure contact state and slide, leaving only the knob shaft 5a. A rotational force is transmitted to the variable resistor 2, and the variable resistor 2 is rotated by a predetermined amount to perform gain adjustment.

Furthermore, if the motor shaft 5b is mechanically rotated by the motor 3, the motor 3 is rotated with sufficient deceleration, so the rotational force is transmitted to the ring 6.6, and the variable resistor 2 is rotated by a predetermined amount to adjust the gain. is being carried out.

The drive circuit 4 selects various key signals S2 transmitted from the remote control switch 7 by a key processing circuit 8 and a controller 9, and then outputs a drive signal S1 for appropriately driving the motor 3.

In such a configuration, when adjusting the volume from the remote control switch 7 using the remote control switch 7, for example, press the up key to increase the volume, or press the do key to decrease the volume.
Continue pressing the wn key. Only while the key is pressed, a signal S2 is transmitted from the remote control switch 7 to the key processing circuit 8, and the key processing circuit 8 and controller 9 select this key signal S2 and control the drive of the motor 3. A control signal S3 is output. The drive circuit 4 amplifies this control signal S3 with a predetermined gain and outputs a drive signal S1 necessary for driving the motor 3.

Only while the key is pressed, the motor 3 rotates a predetermined amount according to the key information, and the ring 6.6 rotates accordingly.
The variable resistor 2 is rotated clockwise (increasing the volume) or counterclockwise (decreasing the sound ff1N) to obtain a predetermined volume.

[Problem that the invention seeks to solve]

However, since the conventional electronic volume uses a semiconductor circuit as the electronic circuit, it has the problem that it tends to generate specific noise and distortion, making it unsuitable for the above-mentioned high-grade stereo equipment and the like.

On the other hand, conventional electric volume controls do not cause noise or distortion, but the volume increase/decrease speed is slow when operated with a remote control switch, and the user has to keep pressing the key every time the sound fW is adjusted. There is,
There is a problem in that the player becomes irritated until the desired volume is reached and temporarily loses his or her ability to enjoy music and relax.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to improve the operability during gain adjustment and to provide gain adjustment that can automatically obtain a desired gain with a single touch.

[Means for solving problems]

Means for achieving the above object in the present invention includes a variable resistor for gain adjustment, a motor that drives the variable resistor, a drive circuit that supplies a drive signal to the motor, and a drive circuit that operates in conjunction with the variable resistor. an encoder that detects the digit 1 of the variable resistor corresponding to the gain level and outputs a code signal, a discrimination circuit that decodes the code signal and outputs a position signal, and holds the position signal when instructed. a holding circuit that compares the position signal held by the holding circuit with the current position signal, and drives and controls the motor based on the comparison result to return the variable resistor to the position of the held position signal. and a comparison circuit that outputs a deviation signal to the drive circuit.

[Effect]

In the above configuration, the set gain level is converted into a position signal by detecting the position of the variable resistor by the encoder, and this position signal is held in the holding circuit. After that, even if there is a change in the gain level, this set gain level is compared with the current gain level in a comparator circuit for a period where it is maintained, and if there is a difference between the two, the motor is driven and the current gain level is changed. The level is controlled to return to the set gain level. Therefore, with the gain adjustment device of the present invention, a predetermined gain level can always be adjusted with one touch.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.In the drawings, parts having the same functions as those of the conventional example are denoted by the same reference numerals, and the details thereof will be omitted.

FIG. 1 is a block diagram of a gain adjustment device showing an embodiment according to the present invention.

This gain adjustment device is applied to a volume adjustment means in a power amplifier 14 shown in FIG. The encoder 1 includes an encoder 10 that detects the angle of rotation (by which the rotation angle is grasped);
A discriminating circuit 11 converts the code signal S4 outputted from 0 into an electric signal to decipher the rotation angle, and a device signal S5 composed of this discriminating circuit 11 is sent to the appropriate machine f according to an instruction.
A holding circuit 12 consisting of a RAM, etc., which holds the level, compares this position signal S5 with another position signal S6 from the discrimination circuit 11, that is, a signal corresponding to the current position of the variable resistor 2, and performs subtraction processing. The main part thereof includes a comparison circuit 13 which outputs a deviation signal S7 based on the result.

Control signals 38 and 59 are input to the holding circuit 12 and the comparison circuit 13 from the controller 9, respectively.

Remote control switch 7' is up primary key down
In addition to the n key, setting keys for setting an appropriate value for the volume level, adjustment keys for obtaining a desired volume level, and the like are arranged.

The adjustment knob 1 is used to manually adjust the volume as necessary.

In such a configuration, the operation of the gain adjustment device of the present invention will be described below.

First, in order to set the volume level to the desired level, press the UP key or the DOWN key of the remote control switch 7'.
When the n key is pressed, a key signal S2 is instantaneously transmitted, and the key information is processed and analyzed by the key processing circuit 8 and controller 9. Then, the ζ control signal S3 is output to the drive circuit 4, the drive circuit 4 outputs the drive signal S1, the motor 3 rotates by a predetermined amount, and the variable resistor 2 also rotates by a predetermined amount accordingly. Knob operation and up primary key dowri
Once the volume level has been finely adjusted and set to the desired level by key operation, when the setting key is pressed to maintain this volume level as the properly set volume level, the controller 9 sends a control signal S8. At the same time, the encoder 10 outputs a code signal S4 that detects the position of the variable resistor 2 corresponding to this volume level.

The discrimination circuit 11 decodes this code signal S4, converts it into an electrical signal, and outputs a position signal S5 to the holding circuit 11, and the holding circuit 12 holds this position signal S5. In this manner, the desired volume level is converted into a position signal by operating the setting key and is stored.

Then, if the volume level is currently being adjusted at a variable resistor position different from the desired volume level by moving adjustment knob 1 or the UP/DOWN key, and you want to return it to the desired volume level, , when the adjustment key is pressed once, control signals S8 and 39 are output from the controller 9 to the holding circuit 12 and the comparison circuit 13, respectively, and the held position signal S5 corresponding to the desired set volume level is output from the holding circuit 12 for comparison. It is output to the circuit 13. on the other hand,
The determination circuit 11 outputs a position signal S6 corresponding to the current variable resistor position to the comparison circuit 13. Comparison circuit 13
compares these position signals S5 and 86, and if they do not match, performs subtraction processing and sends the deviation signal S7 to the drive circuit 4.
Output to. Then, the current volume level (when the desired volume level is reached, the motor 3 is driven to rotate the variable resistor 2 by a predetermined amount clockwise to increase the volume level until there is no difference between the two, and the current volume level) When the desired volume level is reached, the variable resistor 2 is rotated by a predetermined amount counterclockwise to reduce the volume level until there is no difference between the two, thereby obtaining the desired volume level of 1/bell. If there is no difference between the two, the comparison circuit 13 will not output the deviation signal S7.

Therefore, if there is an extreme difference between the current audio level and the desired audio level, for example, even if there is a difference of 20 dB or more between the two, it is no longer necessary to keep pressing the key as in the conventional example, The desired audio level can always be obtained with a one-touch operation of pressing.

The table below shows the front panel 15 of the power amplifier 14 in Figure 2.
This is an LED light sequence showing the operation status of the foot level adjustment by the above-mentioned remote control switch 7' on the display 16 on the adjustment knob 1.

This indicator 16 has LED color and LED on one chip.
Two light emitting elements are formed that emit light of B color, and when one of the light emitting elements is turned on, one color at a time, and two light emitting elements are formed.
When both of the light emitting elements are turned on, the user sees the intermediate color between them, making it possible to display a total of three colors in an LED sequence.

By using such a display 16, the user can easily understand the operation status.

Note that although a rotating type variable resistor is used in this embodiment, a sliding type variable resistor may be used. Further, the gain level may be displayed digitally.

Furthermore, the application of the gain adjustment device of the present invention is not limited to volume control.

[Effects of the Invention] As explained above, according to the gain adjustment device of the present invention,
An encoder that detects the position of the variable resistor corresponding to the gain level, a holding circuit that holds a position signal corresponding to a preset gain level, and a position signal that corresponds to this position signal and the currently set gain level. It has a comparison circuit that outputs a deviation signal that controls the drive of the motor and returns the currently set gain level to the preset gain level, so the desired gain level can always be set with a single touch. There are effects that can be obtained automatically.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a gain adjustment device according to an embodiment of the present invention, Fig. 2 is a perspective view illustrating a display device used in the embodiment, and Fig. 3 is a block diagram showing a conventional electric volume control device. It is. 2... Variable resistor 3... Motor 4... Drive circuit 10... Encoder 11... Discrimination circuit 12... Holding circuit 13... Comparison circuit

Claims (1)

[Claims] A variable resistor for gain adjustment, a motor that drives the variable resistor, a drive circuit that supplies a drive signal to the motor, and a drive circuit that operates in conjunction with the variable resistor to control the position of the variable resistor corresponding to the gain level an encoder that detects and outputs a code signal; a discrimination circuit that decodes the code signal and outputs a position signal; a holding circuit that holds the position signal when instructed; and a position signal that is held by the holding circuit. and a comparison circuit that compares the current position signal with the current position signal and outputs to the drive circuit a deviation signal that drives and controls the motor based on the comparison result and returns the variable resistor to the position of the held position signal. A gain adjustment device comprising: