JPS607573Y2 - power display circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power display circuit suitable for use in various electronic devices such as stereo receivers and television receivers, and which has a function of displaying multiple display contents.

Generally, in this type of electronic equipment, a scale that displays the operating position of the volume for volume adjustment is provided around the volume on the panel surface, and a so-called power meter that displays the volume is also provided separately on the panel surface, so The display on the screen is complicated.

Furthermore, when performing remote operation using a remote control, it is difficult to identify the volume setting position because the operator and the panel surface of the electronic device are separated by a certain distance.

In view of the above, the present invention proposes a power display circuit which has a simple configuration and is capable of displaying the operating position of a volume control volume on a power meter of an electronic device.

An example in which an embodiment of the present invention is applied to a stereo device will be described below with reference to FIGS. 1 and 2.

First, to explain the left channel L system, IL is the left channel signal input terminal of the stereo device, which is grounded via the volume adjustment volume 2L as the main volume, and the sliding volume of the volume adjustment volume 2L The signal obtained by the second speaker is amplified by the amplifier 3L and sent to the speaker 4L.
are threatened to be supplied to

Furthermore, a part of the output of the amplifier 3L is connected to a rectifying diode 5.
The signal is rectified by L and supplied to a power meter 6L, where the power is displayed.

Since the right channel system R is similar, parts corresponding to the L system are shown with reference numerals instead of L instead of R.

The present invention provides the above-mentioned power display function of the electronic device with a function of displaying the operation position of the main volume for volume adjustment, etc. Therefore, in the present invention, the above-mentioned stereo device When using, main volume 2L for volume adjustment.

First and second comparison output generation volumes linked with 2R, hereinafter simply referred to as first and second volumes 7 and 8;
A comparator 9 to which the first and second comparison voltages V□ and V2 obtained at the sliders of the first and second volumes 7°8 are supplied, and one input terminal of this comparator 9 Capacitors 10 and 11 are inserted (connected in parallel with the first volume 7 in the figure), and thereby the main volume 2L,
2R, that is, when operating the first and second volume 7.8, the voltages N1 and V2 are made different so that an output is obtained from the comparator 9, and during this time the main volume 2
The operation positions (for example, rotational positions) of L and 2R are displayed on the power meters 6L and 6R mentioned above.

The first and second comparison detection volumes 7.8 are each connected in parallel to the DC power supply 23, and the sliders of the first and second volumes 7 and 8 are connected to a pair of input terminals of the comparator 9. A capacitor 10 and a capacitor 10 are connected between one input terminal of the comparator 9 (in this example, the terminal to which the slider of the first volume 7 is connected) and one pole and the other pole of the power supply 23, respectively. 11 is connected.

The output terminal of the comparator 9 is connected to the input terminal of a hold circuit 12 having a holding time of 1 to 2 seconds, and the output terminal of this hold circuit 12 is connected to a transistor 14 through a resistor 13.
The collector-emitter of the transistor 14 is connected to the base of the transistor 14, and a circuit passing through a relay 15 is connected to a power supply 23.

16L and 16R are the first and second switches of the relay 15, the movable terminal 16Ll of the first switch 16L is connected to the diode 5L, and the fixed terminal 15Lb is connected to the amplifier 3.
Connected to the L output terminal.

Further, the second switch 16R is similarly connected to the R channel system.

Furthermore, in the present invention, a voltage generation volume corresponding to the operating position (hereinafter referred to as the third volume) 17 that generates an output corresponding to the operating position of the main volumes 2L and 2R is provided, and this is connected to the first and second volumes 7. As with .8, it works in conjunction with main volumes 2L and 2R.

This third volume 17 is connected in parallel to the power supply 23, so that the operating positions of the main volumes 2L and 2R are simultaneously displayed on the power meters 6L and 6R of both channels L and R systems in the stereo system. In this case, a fourth volume 19 is further provided as shown in the figure, the slider of the third volume 17 described above is connected to the slider of the fourth volume 19, and both ends of this fourth volume 19 are connected. The relay contacts 16L and 16R are connected to fixed contacts 16LC and 15Rc through attenuators 21L and 21R.

In this case, as shown in FIG. 2, the fourth volume 19 is configured to work in conjunction with a volume for adjusting the balance of L and R channels (not shown in FIG. 1) used in a stereo system. Ru.

In such a configuration, when the relay 15 is not energized, the movable terminals 15La, 15Ra of the first switch 16L1 and the second switch 16R are normally closed contacts, respectively.
b, l Assume that it is connected to the 6Rb side.

At this time, outputs are supplied from the amplifiers 3L and 3R of channels L and R to the left speaker 4L and right speaker 4R, so of course these are driven, but these amplifiers A part of the output from the power meters 6L and 3R is passed through rectifying diodes 5L and 5R to the power meter 6L,
6R, and the level of the output that is supplied to the left speaker 4L and right speaker 4R is displayed.

Next, when the main volumes 2L and 2R for volume adjustment are operated, the respective sliders of the first and second volumes 7.8 and the third volume 17 move.

By the way, since capacitors 10 and 11 are connected to the slider of the first volume 7, the first comparison voltage N
1 changes slowly, and the second comparison voltage V2 changes rapidly in response to volume operation.

As a result, for a predetermined period of time, the first comparison voltage V□ and the second comparison voltage V2 become V1Y2, and a comparison output voltage is obtained at the output terminal of the comparator 9.

The output voltage of the comparator 9 is then supplied to the base of the switching transistor 14 through the hold circuit 12.

As a result, the switching transistor 14 is turned on for, for example, 1 to 2 seconds, the relay 15 is energized, and the movable terminal 16L of the first and second switches 16L and 16R is turned on.
a, 16Ra fixed terminal l 5Lc, l 5R
connected to c.

As a result, the output voltage obtained from the slider of the third volume 17 that is operated in conjunction with the adjustment of the main volumes 2L, 2R is supplied to the attenuators 21L, 21R via the fourth volume 19, and is damped with a damping ratio of
The power is supplied to the power meters 6L, 6R via the first switch 16L1, the second switch 16R, and the diodes 5L, 5R.

As a result, the operating positions of the main volumes 2L and 2R are displayed on the power meters 6L and 6R.

That is, the voltage corresponding to the operating position (for example, rotational position) of the main volumes 2L and 2R is obtained from this third volume, and this voltage is supplied to the meters 6L and 6R, respectively, for a predetermined period of time. 6R allows the operating positions of the main volumes 2L and 2R to be known.

Note that in the illustrated example, the fourth volume 19 is used to
Since the voltage obtained with the volume 17 of
2 seconds), the balance status of both channels can also be known from the vibration of both meters 6L and 6R, and therefore the operating status of the balance volume 18 can be determined by the power meter 6L and 6R.
Adjustments can be made while monitoring with 6R.

Note that when a predetermined time has elapsed after operating the main volumes 2L and 2R for volume adjustment, the first comparison voltage V1 changes to the second voltage.
Since the output voltage of the comparator 9 becomes equal to the comparison voltage V2 of the switching transistor 14, the output voltage of the comparator 9 cannot be obtained.
is turned off and relay 15 is no longer energized.

As a result, the first switch and second switch 16L and 16R of the relay 15 (7) movable terminal l 6La,
15Ra is connected to normally closed contacts 15Lb and 15Rb, and the state described above is restored.

Thus, according to the meter display circuit of the present invention, by operating the main volume for volume adjustment, the main volumes 2L, 2
Since the operating position of R can be switched to be displayed on the power meters 6L and 6R, the configuration is simple and the power meter can also be used to display the operating position of the main volume for volume adjustment. It is possible to prevent the display from becoming complicated.

In addition, when performing remote control using a remote control, even though the operator and the panel surface of the electronic device are separated by a certain distance, the operating position of the main volume is clearly displayed on the power meter, making it easy to operate. It is possible to distinguish between

Although the above-mentioned embodiment has been described with reference to an example in which the present invention is applied to a stereo device, the present invention can be easily applied to various other electronic devices such as a television receiver.

Further, the power meter mentioned above is not limited to a meter having a coil such as a movable wire type or an induction wire type, and various types such as a meter configured with a plurality of LEDs can be selected.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the meter display circuit of the present invention, and a side view of the second factor balance volume. 2L and 2R are main volumes, 7 and 8 are first and second comparison output generation volumes, 9 is a comparator, 10.11 is a capacitor, 6L and 6R are power meters, 17 is a voltage generation volume corresponding to the operating position It is.

Claims (1)

[Scope of utility model registration request] a main volume, first and second comparison output generation volumes that are linked to the main volume, and a voltage generation volume corresponding to the operating position that is linked to the main volume and that generates an output that corresponds to the operating position of the main volume. , the first and second volumes from the first and second comparison output generation volumes.
a comparator to which a comparison voltage of is supplied, a relay driven by the output from the comparator, and a capacitor connected to one input terminal of the comparator, and when the main volume is operated. Based on the fact that a difference in input voltage is generated between one input terminal and the other input terminal of the comparator, the relay is driven at least during the generation period of this differential voltage, and the switch is switched by the relay to generate the voltage corresponding to the operation position. A power display circuit that supplies the output from the generation volume to the power display.