JPH03111717A - Voice level display circuit - Google Patents

Abstract

PURPOSE:To enable display of an object voice level by an installation being as small in size and economical as possible, by providing first and second amplifiers, first and second light-emitting diodes and a level display means. CONSTITUTION:A first amplifier 100 receives as an input a voice signal being an object of display and outputs a first output voltage V100 which decreases with an increase of a voice level VX of the signal. A second amplifier 200 receives the voice signal as an input and outputs a second output voltage V200 which increases with the increase of the voice level VX of the signal. A first light-emitting diode 300, driven by the voltage V100, emits a light in a first color and increases the luminance with an increase of the voltage V100. A second light-emitting diode 400, driven by the voltage V200, emits a light in a second color different from the first color and increases the luminance with an increase of the voltage V200. A level display means 500 synthesizes an output light of the diode 300 and an output light of the diode 400 and displays the voice level VX of the voice signal with a synthesized light varying between the first and second colors.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of the audio level display circuit that displays the audio level, the purpose of this invention is to make it possible to display the target audio level with as small and economical equipment as possible. a first amplifier that receives an audio signal and outputs a first output voltage that decreases as the audio level of the audio signal increases; a second amplifier that outputs a second output voltage that increases accordingly;
a first light emitting diode driven by a first output voltage to emit light in a first color and whose brightness increases as the first output voltage increases; a second light emitting diode that emits light in a second color different from the color and whose brightness increases as the second output voltage increases; output light of the first light emitting diode; and output light of the second light emitting diode. and level display means for displaying the audio level of the audio signal using synthesized light that changes between the first color and the second color.

[Industrial application field]

The present invention relates to an improvement in an audio level display circuit that displays audio levels.

For example, an operator of a command desk or the like is required to reliably transmit a desired command to a receiver by transmitting at a voice level within an appropriate range.

Therefore, it is desired to be able to display the audio level range of transmitted speech using simple equipment.

[Prior Art] FIG. 5 is a diagram showing an example of a conventional audio level display circuit, and FIG. 6 is a diagram showing an example of another conventional audio level display circuit.

In FIG. 5, the voice level vX sent from the communication circuit 1 to the communication line 2 is input to a level measuring device (LVM) 3 connected in parallel to the communication line 2. In FIG.

The level measuring device (LVM) 3 measures the input audio level V
, is displayed as a level value, so the displayed level value will accurately display the audio level ■8, but the level measuring device (
LVM) 3 itself is quite expensive and large.

Next, in FIG. 6, the voice level VX sent from the communication circuit 1 to the communication line 2 is input to an attenuator 4 connected in parallel to the communication line 2, and is suitable for input to the control section 5. It is converted into a voltage (4) and transmitted to the control section 5.

The control unit 5 outputs the upper string voltages VSI to VSt in proportion to the input voltage v4.

For example, if voltage ■4 is not input, the voltage VSI to V
S? When the voltage V4 reaches the minimum level, only the voltage VSI is output, and as the voltage V4 increases, the output voltage gradually increases to v, 1, VSZ, etc. However, when voltage V4 reaches the maximum level, all voltages VSI to vs are output.

Each voltage VSI to VS? output by the control section 5 is power supply 8
At the same time, the light emitting diodes 7-1 to 7-7 are energized via the drivers 6-1 to 6-7, respectively.

Each of the energized light emitting diodes 7-1 to 7-7 emits light in the same color.

Therefore, when the audio level VX is at the minimum level, only the light emitting diode 7-1 emits light, and thereafter as the audio level 8 increases, the light emitting diodes 7-1, 7-2,
. . . gradually increases, and when the audio level VX reaches the maximum level, all the light emitting diodes 7-1 to 7-
7 will emit light.

Based on the above, light emitting diode? The sound level vx can be recognized by the number of light emitted from -1 to 7-7, but since the sound level display circuit shown in Fig. 6 is also composed of a considerable number of circuit elements, the equipment is quite expensive and large. .

[Problem to be solved by the invention]

As is clear from the above description, conventional audio level display circuits either display the audio level v8 using the measured value of the level measuring device (LVM) 3, or display the audio level vX using the measured value of the light emitting diodes 7-1 to 7-7. Although the display was based on the number of emitted light, the equipment was expensive and large, and there were problems in terms of implementation and economy.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to display a target audio level using as small and economical equipment as possible.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 100 is a first amplifier provided according to the invention.

200 is a second amplifier provided according to the present invention.

300 is a first light emitting diode provided according to the present invention.

400 is a second light emitting diode provided according to the present invention.

500 is a level display means provided according to the present invention.

[Effect]

The first amplifier 100 inputs an audio signal to be displayed and outputs a first output voltage VIO0 that decreases as the audio level 8 of the audio signal increases.

The second amplifier 200 receives the audio signal and outputs a second output voltage 2° which increases as the audio level v, t of the audio signal increases. Output.

The first light emitting diode 300 has a first output voltage V10
0 to emit light in a first color, and the first output voltage is -Y. . The brightness is increased as the value increases.

The second light emitting diode 400 has a second output voltage of 2°. The light is driven by a second color, which is different from the first color, and has a second output voltage of 2°. The brightness is increased as the value increases.

The level display means 500 is a first light emitting diode 300
The output light of the second light emitting diode 400 is combined with the output light of the second light emitting diode 400, and the audio level V8 of the audio signal is displayed by the combined light that changes between the first color and the second color.

Therefore, since the audio level of the target audio signal is displayed by changing the color of the light emitted from the - set of level display means,
The range of audio levels can be easily estimated, and the equipment can be made smaller and more economically viable.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing an audio level display circuit according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of input/output characteristics of the inverting and non-inverting amplifiers in FIG. 2, and FIG. FIG. 3 is a diagram showing an example of coloring characteristics of the level indicator in FIG. 2; Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, the first amplifier 100 in FIG.
1, a non-inverting amplifier 11 is provided as the second amplifier 200 in FIG. 1, a green light emitting diode 14G is provided as the first light emitting diode 300 in FIG. A red light emitting diode 148 is provided as the second light emitting diode 400 in the figure, and a level display 14 containing a green light emitting diode 14a and a red light emitting diode 14K is further provided as the level display means 500 in FIG. Note that the attenuator 9 is used to adjust the input voltage to the inverting amplifier IO and the non-inverting amplifier 11, and the drivers 12 and 13 are used to drive the green light emitting diode 14a and the red light emitting diode 14. and 16 are for limiting the drive currents of the green light emitting diode 14e and the red light emitting diode 14m.

In FIGS. 2 to 4, a voice level v8 sent from the communication circuit 1 to the communication line 2 is input to an attenuator 9 connected in parallel to the communication line 2, and is input to an attenuator 9 connected to the communication line 2 in parallel to an inverting amplifier 10 and a non-inverting amplifier 11. The voltage V is converted into a voltage V suitable for input to the inverting amplifier 10 and the non-inverting amplifier 11 in parallel.

The inverting amplifier 10, as shown in FIG. It has a characteristic of increasing the output voltage Vll as the voltage V increases.

The voltage V outputted by the inverting amplifier 10. is input to the driver 12, and the voltage V output from the non-inverting amplifier 11 is input to the driver 13.

The driver 12 approximately proportionally converts the input voltage VIO into a voltage V, □ suitable for driving the green light emitting diode 14c, and inputs it to the green light emitting diode 14°. The red light emitting diode 14* is approximately proportionally converted to the voltage vI3 suitable for driving the red light emitting diode 14*. Enter.

The green light emitting diode 14G emits green light with a light amount L6 approximately proportional to the input voltage V, □, and the red light emitting diode 14. emits red light with a light amount LR approximately proportional to the input voltage V1.

Therefore, as shown in FIG. 4, as the audio level VX input to the attenuator 9 changes from a low level to a high level,
The voltage V10% output by the inverting amplifier 10 and the driver 1
Since the voltage v1□ outputted by the non-inverting amplifier 11 gradually decreases, the amount of green light L+ emitted by the green light emitting diode 146 gradually decreases. Since the light emitting diode 14s+ gradually increases, the amount of red light L5 emitted by the red light emitting diode 14s+ gradually increases.

On the other hand, from the level indicator 14, the amount of green light L6 emitted from the built-in green light emitting diode 14c and the amount of red light emitted from the built-in red light emitting diode 14s+ are combined and sent to the outside as combined light L. Because the audio level vx is low enough, the green light emitting diode 1
The amount of green light emitted from 4c is the maximum, and the amount of light emitted from red light emitting diode 14. The amount of red light emitted from I
is minimum, the composite light emitted by the level indicator 14, 4, exhibits a green color, and the audio level VX is sufficiently high, the green light emitting diode 14. The amount of green light emitted from
is the minimum, and when the red light 1t,i emitted from the red light emitting diode 14 is the maximum, the level indicator 1
The synthetic light emitted by 4 is red, and the audio level is
8 is approximately in the middle, and when the amount of green light LG emitted from the green light emitting diode 146 and the amount of red light LR emitted from the red light emitting diode 14R are approximately equal, the combined light emitted by the level indicator 14 is green. When combined with red, it produces orange.

Therefore, as the audio level Vx changes from the lowest level to the highest level, the combined light LH emitted by the level display blocker 4
gradually changes from green (G) to red, passes through orange (0), and finally changes to red (R).

As described above, by observing changes in the composite light LM emitted by the level indicator 14, it is possible to estimate the range of change in the audio level (1)8.

As is clear from the above description, according to this embodiment, the green light emitting diode 14G and the red light emitting diode 14.
Combined light LM emitted by a set of level indicators 14 containing
As a result, it is possible to approximately estimate the range of change in the target audio level Vx, and it is possible to appropriately adjust the transmission level.

Note that FIGS. 2 to 4 are only one embodiment of the present invention, and for example, the first amplifier 100, the second amplifier 200
, the first light emitting diode 300, the second light emitting diode 400, and the level display means 500 are not limited to those shown in the drawings, and many other modifications may be considered; In this case, the effects of the present invention remain the same.

〔Effect of the invention〕

As described above, according to the present invention, since the audio level of the target audio signal is displayed by changing the color of the light emitted from the - set of level display means, the range of the audio level can be easily estimated, and the equipment is not required. It becomes possible to downsize and economically realize it.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an audio level display circuit according to an embodiment of the present invention, and FIG.
FIG. 4 is a diagram showing an example of the input/output characteristics of the inverting and non-inverting amplifiers in FIG. 2, FIG. 4 is a diagram showing an example of the coloring characteristics of the level indicator in FIG. FIG. 6 is a diagram showing an example of another conventional audio level display circuit. In the figure, 1 is a communication circuit, 2 is a communication line, 3 is a level measuring device (LVM), 4 and 9 are attenuators, 5 is a control unit,
6-1 to 6-7. 12 and 13 are drivers, 7-1 to 7-7 are light emitting diodes, 8 is a power supply, 10 is an inverting amplifier, 11 is a non-inverting amplifier, 14 is a level indicator, 146
is a green light emitting diode, 14m is a red light emitting diode,
15 and 16 are current limiting resistors, 100 is a first amplifier, 200 is a second amplifier, 300 is a first light emitting diode, 400 is a second light emitting diode, and the principle diagram of the 500 cypress. Inverting power characteristic of 1/4 inverting amplifier shown in Figure 2 (Figure 1) mouth

Claims (1)

[Claims] A first amplifier (100) that receives an audio signal to be displayed and outputs a first output voltage (V_1_0_0) that decreases as the audio level (V_x) of the audio signal increases.
and input the audio signal, and determine the audio level (V_
The second output voltage (V_2_
a second amplifier (200) that outputs a second output voltage (V_1_0_0) and emits light of a first color by being driven by the first output voltage (V_1_0_0);
a first light emitting diode (300) whose brightness increases as the output voltage (V_1_0_0) increases; a second light emitting diode (400) whose brightness increases as the second output voltage (V_2_0_0) increases; and the output light of the first light emitting diode (300) and the second light emitting diode (400). Combines with the output light,
An audio level display circuit comprising: level display means (500) for displaying the audio level (V_x) of the audio signal using the composite light that changes between the first color and the second color. .