JPH066602Y2 - Volume display circuit - Google Patents

Description

[Detailed Description of Device] [Object of Device] (Industrial field of application) [0001] The present invention relates to a volume display circuit, and more specifically, so-called muting for switching a volume set by a volume so as to reduce the volume by a predetermined amount. The present invention relates to a device capable of displaying the operating state of a switch.

(Prior Art) Generally, an audio amplifier is provided with a muting switch for switching the volume set by the volume so as to be reduced by a predetermined amount (about 10 dB to 20 dB), and it is desired to temporarily reduce the volume. Sometimes used.

On the other hand, in recent years, as shown in FIG. 4, in order to clearly display the set position of the volume, various volume display positions 10 are arranged so as to sequentially turn on a plurality of light emitting diodes D arranged in conjunction with the operation of the volume. Although proposed, the display of the on / off state of the muting switch is generally performed separately from the volume display by turning on the light emitting diode DM provided separately.

(Problems to be solved by the invention) However, in the above-mentioned conventional device, the display on the muting switch side is difficult to see because the volume display and the display of the on / off state of the muting switch are installed independently. Of course, there is a drawback that when the muting switch is turned on, that is, when the volume is reduced, there is a gap between the volume display and the actual volume.

The present invention has been made in view of the above points, and an object thereof is to display the on / off state of the muting switch together with the volume display so that the visibility can be greatly improved. It is to provide a volume display circuit.

"Constitution of Device" (Means for Solving Problems) A volume display circuit according to the present invention can display the muting state when the volume set by the volume is reduced by a predetermined amount by muting. Is a volume display circuit, in which a number of lighting elements are arranged to display the volume set by the volume according to the number of lights, and all of the lighting elements are associated with muting operation. Alternatively, a display switching unit for switching so that a part of the display blinks is provided.

(Operation) The display unit displays the volume set by the volume by the number of lighting elements, but when the muting switch is turned on, that is, when the volume is reduced by a predetermined amount, all or part of the lighting element is displayed. It works to make it blink.

(Embodiment) An embodiment of the volume display circuit according to the present invention will be described with reference to FIGS.

In the figure, reference numeral 1 denotes a volume control section of an amplifier (not shown), which is configured to limit the volume by setting the volume VR and turning the muting switch MS on and off, and outputs a volume setting position signal I. It is like this. A display switching unit 2 is for controlling the display state of the volume display unit 3 which should display the volume. The volume indicator 3 is a light emitting diode in the embodiment.
It is composed of D1 to Dn and switching transistors Q1 to Qn, the power source + B is connected to the anode side of the light emitting diodes D1 to Dn, and the cathode side is grounded via the collector / emitter of the switching transistor. , The bases are control signal input terminals P1 to Pn.

The volume setting position signal I and the switch position signal M from the switch detection unit 4 provided for detecting the on / off state of the muting switch MS are input to the display switching unit 2. But
The switch position signal M is normally at a high level (hereinafter abbreviated as H), and when the muting switch MS is turned on by the rectangular wave oscillator 5 provided in the switch detection unit 4, that is, when the muting switch is set to the muting state. The high level and the low level appear alternately and serve as a signal source for blinking the light emitting diode as described later.

The volume setting position signal I is input to the display switching unit 2 and this signal is divided into I1 to In in the embodiment, and a signal of H from the I1 side to the In side in sequence as the volume increases. It is supposed to be entered. As shown in FIG. 2, the display switching section 2 is specifically composed of AND gates G1 to Gn each of which receives the signals I1 to In as one input and the switch position signal M as the other input,
The output terminals of the AND gates G1 to Gn are connected to the bases of the transistors Q1 to Qn, respectively.

An operation example of the above configuration will be described. First, since the switch position signal M is H when the muting switch MS is off, that is, when the muting is not applied, the AND gates G1 to Gn directly input the volume setting position signals (I1 to In) to the input terminals P1 to Pn. To deliver to. On the other hand, when the muting switch MS is turned on, that is, when the volume is reduced, the switch position signal M
Is a pulse-like signal that repeats high level and low level, and AND gates G1 to Gn operate so as to intermittently send the volume setting position signals (I1 to In) to the input ends P1 to Pn. Therefore, for example, when the volume setting signal I in which only I1 to I3 are H is input, the switching transistors Q1 to Q3 are on / off controlled, and the light emitting diodes D1 to D3 blink.

In the above embodiment, all the light emitting diodes D1 to D3 being displayed are configured to blink, but not limited to this example, only a part (for example, D1) of the light emitting diodes D1 to D3 blinks, and other Of course, the light emitting diodes (for example, D2 and D3) may be configured to be set to the lighting state.

"Effect of the Invention" According to the volume display circuit of the present invention, the volume set by the volume can be displayed by the number of lighting elements arranged in the volume display section, and the muting switch is turned on. That is, when the volume is reduced, all or part of the lighting elements that should be turned on blinks, so that the muting state can be visually recognized at a glance, and erroneous operation can be prevented. Of course, there is an excellent feature that the volume and the display can be sensuously matched.

[Brief description of drawings]

1 to 3 show an embodiment of a volume display circuit according to the present invention. FIG. 1 is a block diagram, FIG. 2 is a specific circuit configuration example of a display switching unit, and FIG. 3 is a volume display unit. FIG. 4 is a front view showing an operating state, and FIG. 4 is a front view showing an operating state of the conventional volume display unit. 1: Volume control unit, 2: Display switching unit 3: Volume display unit, 4: Switch detection unit MS: Muting switch

Claims (1)

[Scope of utility model registration request] 1. A volume display circuit capable of displaying the muting state when the volume set by the volume is reduced by a predetermined amount by muting, and the volume set by the volume is turned on. A volume display section in which a large number of lighting elements are arranged so as to be displayed according to the number, and a display switching section for switching so as to blink all or part of the lighting elements in accordance with a muting operation. A volume display circuit characterized by the above.