JPH01302903A - Display device in audio equipment - Google Patents

Abstract

PURPOSE:To improve a visual effect by automatically switching a system to a demonstration display mode when an input audio level is lower than a prescribed one. CONSTITUTION:The button operation signal of a key matrix 1 is inputted to a controller 2, and is written to a RAM2b. With information in the RAM2b, respective analyzer switches in a display driver 2c are operated and respective segments of a fluorescent display tube in a display 6 are lighted. Information in the RAM2b is given to a frequency equalizer 3 and the output levels of respective frequency bands are controlled. When a display change over switch 8 is turned on while a music is reproduced, the driver 2c fetches output data from a level detection circuit 7 and causes the display 6 to attain bar chart display. When the input level is lower than the prescribed one, a control circuit 2a is switched to the demonstration mode in a ROM2d by the output of a level detection circuit 10 so as to attain display.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention divides an audio band into a plurality of bands, and uses a graphic equalizer that controls the audio level of each band to be enhanced or attenuated, so that the output level of each band can be visually determined. The present invention relates to a display device in an audio device equipped with a spectrum analyzer function that allows for confirmation.

[Technical background of the invention]

Conventional devices of this type have an audio band of, for example, 7
A graphic equalizer is provided that divides the frequency into one or nine frequencies and controls the output level of each frequency to be enhanced or attenuated.

Moreover, this graphic equalizer is also available in which the display device can be switched to a spectrum analyzer for display.

FIG. 7 is a block diagram showing an example thereof.

In the figure, 1 is a key matrix, and 2 is a controller that receives key operation data from this key matrix and outputs equalizer command data and display data. A frequency equalizer 3 receives equalizer command data from the controller 2, adjusts the output level of each band of the audio signal from the audio input signal path 4, and outputs the same to the output signal path 5.

Further, numeral 6 denotes a display comprising a fluorescent display tube or the like for receiving display data from the controller 2 and displaying equalizer characteristics and the like.

The controller 2b includes a control circuit 2a consisting of a microcomputer that operates according to a predetermined program;
It includes a RAM 2b, a display driver circuit 20, and the like.

Further, a level detector 7 is connected to the output signal path 5 of the frequency equalizer 3, which divides the audio output provided from the output signal path 5 into each band and detects the level of each divided band. The level output information for each band from the level detector 7 is transmitted to the display driver circuit 2C.
It is connected to the. A display changeover switch 8 is connected to the display driver circuit 2c, and the changeover switch 8 is configured to selectively bring equalizer characteristic information or spectrum analyzer information from the control circuit 2a to the display 6 from the display driver 20. There is.

As described above, conventional devices are configured to switch the display to display equalizer characteristics or spectrum analyzer characteristics.

However, it is not necessary to change the equalizer characteristics frequently, so it is usually set to the spectrum analyzer mode to visually display the audio level of each band.

However, according to the spectrum analyzer display, when the input audio level is extremely low, or when a tape deck is used as the source, the display will hardly or not light up at all when the deck is in fast forward or rewind mode, and the display will be extremely mediocre. Become something.

C. Purpose of the Invention The purpose of this invention is to improve the problems of the prior art, and to create a relatively variable display manually or automatically when the input audio level is extremely low. The purpose is to do so.

[Summary of the invention]

In order to achieve the above object, in this invention, R
A display mode is provided in which a plurality of display segments are sequentially lit based on a lighting display routine stored in a memory element such as an OM, and the above display mode is activated manually or automatically when the input audio level is lower than a predetermined level. The feature is that the switch is switched to .

〔Example〕

The present invention will be explained below based on examples. FIG. 1 is a block diagram showing an embodiment of the invention. Code 1 in the diagram
The parts indicated by 8 to 8 are the same as or equivalent to the conventional example shown in FIG. 7, and therefore the explanation of the structure will be omitted.

In this embodiment, the ROM 2 is used for the control wholesale circuit 2a.
d is connected, and data for generating a predetermined display mode is stored in this ROM 2d. Further, the control circuit 2a is connected to a mode selection switch 9 or an output terminal of a level detection circuit 10 that detects the level of the entire audio band as indicated by a broken line.

As shown in FIG. 2, the display 6 consists of nine blocks (χ
6 to XS) It has segment display sections arranged in parallel.

The RAM 2b in the controller 2 has a storage location designated by an address corresponding to each lighting segment represented by the χY coordinate, and a logic "1" is stored in the storage location M designated by the address (xk+yj2) by the control circuit 2a. When written, the lighting segment corresponding to the address (xk, yj2) is driven to be lit by the display driver circuit 2C.

As shown in FIG. 3 showing the appearance of the graphic equalizer device, the key matrix 1 is arranged around a display 6 consisting of a fluorescent display at the center of the front panel, and includes frequency call buttons 11a, 11b and a level setting button 12a.
, 12b, etc. Each time the frequency call button 11a is pressed, each band whose level can be set can be moved sequentially to a higher frequency, and each time the frequency call button 11b is pressed, each band whose level can be set can be sequentially moved to a lower frequency. In each band called up by the frequency call button 11a or Ilb, each time the level setting button 12a is pressed, the setting button 12b is pressed so as to increase the output level of the called band. control is performed so that the output level of the called band is lowered each time the band is called.

The frequency equalizer basically consists of a polysilicon resistor pattern for each frequency band and a plurality of MO3 type switches connected between these patterns, and is controlled by opening and closing of an external glue actance element and an MO8 type switch. The output level of each band is determined by the combined resistance of the selected polysilicon resistors.

In the above configuration, first, for example, 60Hz is selected by the frequency call buttons 11a and llb in the key matrix 1.
When the frequency is called up and the level setting button 12a is pressed in two steps, a logic 1 pass is written in the memory location corresponding to (XO-ye) in the RAM 2b. Similarly 12
14 steps at 5Hz, +1 at 250Hz
Step--1--When operating at +4 step etc. at 16KHz, RAM2b contains (x, ~yI
0), (X2~y7) --------(xe~
y. ) is written to the position corresponding to the logic "1".

The information written in this RAM 2b operates each analyzer switch in the display driver circuit 2c,
Each segment of the fluorescent display tube is lit as shown in FIG.

Similarly, the information written in the RAM 2b is also given to the frequency equalizer 3, which operates the MO3 type switch provided for each frequency band and controls the output level of each frequency band using a polysilicon resistor.

Therefore, the frequency characteristics at this time are displayed graphically as shown in FIG. 3, and the reproduced frequency characteristics can be visually confirmed.

When the display changeover switch 8 is turned on while playing music using the equalizer characteristics set as described above, the output is applied to the display driver 20;
0 takes in the output data from the level detection circuit 7.

The level detection circuit divides the audio band into nine parts, detects the output level of each, and sends lighting level data to the display driver 20.

Therefore, the X on display 6. The lighting segments of each block composed of -XIl are lit in a bar graph shape in the y0 to y12 directions according to the input level, and act as a spectrum analyzer.

When the mode selection switch 9 is turned on in the above state, the control circuit 2a switches from the first display mode as a spectrum analyzer to the second display mode (demonstration mode) stored in the ROM 2d.

The mode selection switch 9 is turned on, for example, when the main body of the graphic equalizer device is turned off,
The second display mode will be explained below.

FIG. 4 shows an outline of the display operation, and when the switch 9 is turned on, the display 6 first changes to the state shown in FIG.
), the central segment (X413'6) lights up, and in turn lights up so that bands extend outward on both sides, forming a horizontal-linear wall in the center as shown in Figure 4 (B). Light it up as you did. As the next step, see Figure 4 (C).
The segment of X4+y++ and Xa+V as shown in
The segment a lights up, and as the next step,
As shown in FIG. 4(D), the segment X513'IO and the segment X413'6 light up.

FIG. 4(E) shows the lighting state (xs
ly3)(X7+ye).

In other words, the upper and lower lighting segments are sequentially turned on in a ball-like motion with a wall formed horizontally and linearly in the center.

FIG. 5 is a flowchart showing the operations performed by the controller 2 as described above.

That is, when the demonstration mode starts, the control circuit 2a reads display data for lighting as shown in FIG. 4(A) from the ROM 2'd (step 1). Next, it is determined whether the page of display data is the one shown in FIG. 4(B) (step 2), and if it is different, the display data is sent to the display 6 (step 3). Further, the page of display data is incremented (step 4), and the process returns to step 2 again to judge whether or not the incremented page data has reached the horizontal-linear lighting data shown in FIG. 4(B). This is incremented four times to make the decision, and then the data of the first page as the upper half data of the display 6 is called (step 5), and the data of the first page as the lower half data is called. Data is called (step 6). These two data are displayed on the display 6 (step 7), respectively.
The screen is displayed as shown in FIG. 4(C). Then, the pages of display data in the upper half and lower half are incremented by one step (step 8), and it is determined whether the display data in the upper half has reached the end of the series of operations (step 9). If not, it is determined whether the display data in the lower half has reached the end of the series of operations (step 10).

If the display data in the lower half has not reached its final state, the process returns to step 7 and the next page data incremented in step 8 is displayed on the display. In this way, pages of data are sequentially displayed while incrementing,
Display a ball-like motion.

Continuing the above operations, when the display data in the upper half reaches the final data, step 11) returns the upper half data to the original first page data, and the display data in the lower half reaches the final data. When this is reached, the same operation is repeated in step 12) for returning the lower half data to the original first page data.

The above explanation has shown a series of display modes that operate when the mode selection switch 9 is turned on, but for example, as shown by the broken line in FIG. At this time, the operation may be automatically switched to the one described above.

FIG. 6 shows the display routine. First, it is determined whether the mode is the spectrum analyzer mode (that is, switch 8 in FIG. 1 is on) (step 20). If the mode is not the spectrum analyzer mode, the display 6 displays a graphic equalizer (step 21). If it is the spectrum analyzer mode, it is determined whether the output level from the level detection circuit 10 is above a predetermined level (step 22). If the output level is above a predetermined value, a timer counter is set (step 23), and the above-mentioned subekdrum analyzer display mode is set (step 24).

If the output level is below a predetermined value, it is determined whether the value of the timer counter is 0 (step 25).
)do. This predetermined value n refers to a time of about 20 seconds, for example, and if this predetermined time has not elapsed, the counter is incremented by 1 (step 26).

Further, in step 27, it is determined whether the counter value has reached a predetermined value n, and if it has reached the predetermined value n, demonstration mode display is started (step 28).

If the value of the counter does not reach the predetermined value n in step 27, the process returns to step 20, and step 25 is performed again.
As described above, it is determined whether the predetermined value n has been exceeded, and if n has been exceeded, the demonstration mode is displayed.

As described above, if the signal level is above a predetermined value, the spectrum analyzer will immediately enter the display mode, and if the signal level remains below the predetermined value for, for example, 20 seconds or more, it will automatically switch to the demonstration mode display mode. .

〔effect〕

As described above, according to the present invention, when the system is not in use, it is possible to manually display a predetermined display mode, and when the audio input level continues to be below a predetermined level, the predetermined display mode is automatically displayed. Since it is configured to switch to the display mode, it has a unique effect in that the visual effect can be enjoyed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a front view showing the configuration of a display used in this invention, FIG. 3 is a front view showing the external appearance of a product to which this invention is applied, FIG. 4 is a front view showing the lighting state of the display, FIGS. 5 and 6 are flowcharts for explaining the present invention in detail, and FIG. 7 is a block diagram showing an example of the conventional device. 1...Key matrix, 2...Controller, 3
... Frequency equalizer, 4... Audio input signal path, 5... Audio signal output path, 6... Display, 7... Level detection circuit, 8... Display changeover switch, 9... Mode selection switch, 10...level detection circuit. Patent applicant: Pioneer Corporation xo
I X2 X3 X4 X5
(B) Figure 4 (E)

Claims (2)

[Claims] (1) A level detection circuit that divides the audio band into multiple bands and generates an output according to the level of each divided band;
a display device having a display segment divided into a plurality of vertically and horizontally, and receiving an output from the level detection circuit with one vertical row or one horizontal row of display segments in the display device as one block; , a first display mode in which the display segments of each block are selectively lit according to the output thereof, and a second display mode in which the plurality of display segments are sequentially lit and displayed based on a lighting routine stored in a storage element. 1. A display device for audio equipment, characterized in that a display mode is provided, and the first display mode or the second display mode can be selectively displayed by operating a selection key. (2) a level detection circuit that divides the audio band into a plurality of bands and generates an output according to the level of each divided band;
a display device having a display segment divided into a plurality of vertically and horizontally, and receiving an output from the level detection circuit with one vertical row or one horizontal row of display segments in the display device as one block; , a first display mode in which the display segments of each block are selectively illuminated according to the output thereof, and a second display mode in which the plurality of segments are sequentially illuminated based on a lighting routine stored in a memory element. The first display mode is switched to the second display mode when the audio input level remains below a predetermined level for a predetermined period of time, and when the audio input level remains above a predetermined level. 1. A display device for audio equipment, comprising: a control device configured to continue a first display mode.