JPH0115026Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a level operation amount display device for audio equipment.

Audio equipment, such as an amplifier, is equipped with a level controller for adjusting the signal level of an audio signal by controlling the gain of an amplification system, and a display for displaying the output level. Conventionally, a rotary volume or a slide volume has been generally used as a level control device, and a mark is attached to the knob of this volume, and the volume surface (operation amount) is engraved on the panel surface, and the position indicated by the mark is The amount of volume was determined by checking the .

On the other hand, in recent years, so-called electronically controlled level adjustment circuits are equipped with two push (or touch) switches, UP and DOWN, as level controllers, and the output level increases or decreases while the switches are pressed (or touched). It has been widely used. However, since such a level adjustment circuit is configured only by pressing the switch, it is difficult to judge the amount of switch operation. For this reason, some devices are equipped with a separate display to display the amount of operation by the switch, but there are space limitations on the front panel, and increasing the number of displays increases costs and makes the panel surface cluttered. There was a drawback.

An object of the present invention is to provide a level operation amount display device for audio equipment that eliminates the above-mentioned drawbacks.

The level operation amount display device according to the present invention detects the operation of a level controller in an audio equipment including a means for generating a muting control signal when the power is turned on, and instructs the level controller to display the amount of operation during the operation period. The present invention is characterized in that it comprises means for generating a command signal, and is configured to display the manipulated variable on a display for displaying the output level during the generation period of the command signal or the muting control signal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit block diagram of an embodiment of the present invention. In the figure, the signal reproduction system includes, for example, two
Amplifiers 1 and 2 are provided, and a variable resistor VR is inserted between the amplifiers. The variable resistor VR changes its resistance value according to the voltage value of the applied control voltage, and adjusts the output level by controlling the gain of the entire amplification system. A muting circuit 3 is connected to the rear stage of the amplifier 2 to block so-called pop noise (impact noise) that occurs when the power is turned on, and the output of this muting circuit 3 becomes an audio playback signal and is also used as a selection means 4. This is one input.

The control voltage generation circuit 5 generates a control voltage to be supplied to the variable resistor VR in response to the output of a level controller, which is provided in the operating section and consists of two switches (not shown) for UP and DOWN, for example. For example, a clock generator that generates clock pulses, a counter that counts clock pulses UP or DOWN based on an UP or DOWN command signal, and a D/A converter that converts the digital output of this counter into an analog voltage. This is a known circuit configuration consisting of. The control voltage from the control voltage generation circuit 5 is applied to the variable resistor VR and also serves as another input to the selection means 4. The selection means 4 supplies the reproduced output to the display 7 via the display drive circuit 6 in the next stage so as to display the output level of the normal reproduced output. Further, when a command signal to be described later is applied, the control voltage from the control voltage generation circuit 5 is applied via the drive circuit 6 in order to display the amount of operation by the level controller consisting of the two switches mentioned above on the display 7. The signal is supplied to the display 7.

The display 7 has two types of display scales to display the output level of the reproduction output and the amount of operation by the level controller. FIG. 2 shows a front view of an embodiment of the display 7. In FIG. A is an indicator meter, with the upper scale indicating the output level and the lower scale indicating the manipulated variable. b is an indicator using a light emitting diode or the like; similarly, the upper scale indicates the output level and the lower scale indicates the amount of operation.

The command signal to the selection means 4 is sent to the command signal generation means 8.
The signal is generated at the gate 9 and supplied through the OR gate 9. This command signal generating means 8 generates a command signal in response to the ON operation of the above-mentioned level operating device when the level operating device is constituted by a push switch or a touch (contact type) switch. Also,
If the level control device consists of a rotary knob or a sliding knob, the knob is equipped with a touch switch that turns on only when the user touches the knob, and this switch is activated by a command signal. It is used as the generating means 8. Therefore, on the display 7, the amount of operation is displayed only when the level is operated, and the output level is displayed at other times.

The muting control signal generation circuit 10 generates a control signal for driving the muting circuit 3 in order to block the pump noise generated when the power is turned on, and this mutating control signal is used as a command signal to be supplied to the selection means 4. It is also possible to use That is, since the muting control signal is output for a certain period of time from the time the power is turned on, the manipulated variable can be displayed even during this period. Furthermore, by providing a dedicated switch for generating a command signal on the operating section, the user can also confirm the amount of operation by the level operating device when necessary.

As described above, according to the present invention, since the output level and the amount of operation by the level control device can be displayed on a single display, costs can be reduced and the complexity of the panel surface can be eliminated.Furthermore, considering the ease of use, Since the display of the manipulated variable is automatically switched only when the user operates the level controller and turns on the power of the device when the user wants to know the manipulated variable, the manipulated variable can be displayed rationally. In addition, it is easier to confirm the amount of operation even in a dark place compared to conventional mechanical systems. Therefore, the level operation amount display device according to the present invention is suitable for use in audio equipment equipped with an electronically controlled level adjustment circuit.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an embodiment of the present invention, and FIGS. 2a and 2b are front views showing an embodiment of a display device. Explanation of symbols of main parts, 1, 2...Amplifier, 4
...Selecting means, 5...Control voltage generation circuit, 7...
Display device, 8...command signal generation means, VR...variable resistor.

Claims (1)

[Claims for Utility Model Registration] (1) Level operating means for controlling the signal level of an audio signal, display means for displaying the signal level, and means for generating a muting control signal when power is turned on. A level operation amount display device for displaying an operation amount by the level operation means in an audio device including a device, the device detecting an operation of the level operation means and instructing the display of the operation amount by the level operation means for a period of the operation. The present invention is characterized by comprising a command signal generation means for generating a command signal for controlling the output, and configured to display the operation amount by the level operation means on the display means during the generation period of the command signal or the mutating control signal. Level operation amount display device for audio equipment. (2) The level operation amount display device for an audio device according to claim 1, wherein the command signal generating means is a contact type switch provided in the level operation means.