JPH0680995B2 - Display device for audio equipment - Google Patents

Description

The present invention relates to a graphic equalizer that divides an audio band into a plurality of parts and controls the audio level of each band to be enhanced or attenuated. The present invention relates to a display device in an audio device having a spectrum analyzer function that can be confirmed.

[Technical background of the invention]

A conventional device of this type has an audio band of, for example, 7
There is provided a graphic equalizer which is divided into three or nine and is controlled so as to increase or decrease the output level of each frequency. Also, this graphic equalizer is also provided in which the display device is also used so as to be switched and displayed on the spectrum analyzer.

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. Three
Is a frequency equalizer which receives the equalizer command data from the controller 2 and adjusts the output level of each band of the audio signal from the audio input signal path 4 to bring it to the output signal path 5.

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

The controller 2 is a control circuit 2a composed of a microcomputer that operates according to a predetermined program, a RAM
2b and a display driver circuit 2c.

Further, a level detector 7 is connected to the output signal path 5 of the frequency equalizer 3 to divide the audio output provided from the output signal path 5 into each band and detect the level of each divided band. The level output information for each band from the level detector 7 is connected to the display driver circuit 2c. The display changeover switch 8 is connected to the display driver circuit 2c.
Thus, the equalizer characteristic information or the spectrum analyzer information from the control circuit 2a is selectively brought to the display 6 from the display driver 2c.

As described above, the conventional apparatus is configured to switch the display to the equalizer characteristic or the spectrum analyzer characteristic for display.

However, the equalizer characteristic does not need to be changed frequently, and therefore it is usual to set the mode of the spectrum analyzer 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 the tape deck is used as the source, or when the deck is in the fast-forwarding or rewinding state, the display shows little or no lighting, and is extremely mediocre. It becomes something.

[Object of the Invention]

SUMMARY OF THE INVENTION The present invention aims to solve the problems of the prior art, and it is an object of the present invention to provide a relatively variable display manually or automatically when the input audio level is extremely low. To aim.

[Outline of Invention]

In order to achieve the above object, in the present invention, RO
A display mode is provided to sequentially light up and display multiple display segments based on the lighting display routine stored in the memory device such as M. The above display mode can be performed manually or automatically when the input audio level is lower than a predetermined level. The feature is that it is switched to.

〔Example〕

The present invention will be described below based on examples. FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 in the figure
The parts indicated by 8 to 8 are the same as or equivalent to those of the conventional example shown in FIG.

In this embodiment, a ROM 2d is connected to the control circuit 2a, and this ROM 2d stores data for generating a predetermined display mode. Also, the control circuit 2a is connected to the mode selection switch 9 or the output terminal of the level detection circuit 10 for detecting the level of the entire audio band as shown by the broken line.

As shown in FIG. 2, the display 6 has nine blocks (x-axis) composed of 13 (y _{0 to} y ₁₂ ) horizontally long lighting segments arranged in the ordinate (Y-axis) direction. _{0 to} x ₈ ) It has segment display parts 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 XY coordinates, and the control circuit 2 is provided at the storage location M designated by the address (xk, yl).
When a logical "1" is written by a, its address (xk, y
Illuminated segment corresponding to l) is displayed Driver circuit 2c
It is designed to be driven by lighting.

As shown in FIG. 3 showing the appearance of the graphic equalizer device, the key matrix 1 is arranged around the display 6 composed of the fluorescent display device in the center of the front panel, and the frequency call buttons 11a, 11b and the level setting buttons 12a, 12b, etc. have. And each band whose level can be set each time the frequency call button 11a is pressed is sequentially set to a high frequency,
Further, each band whose level can be set each time the frequency call button 11b is pressed is configured to be sequentially moved to a low frequency, and in each band called by this frequency call button 11a or 11b, the level setting button 12a is pressed. It is controlled so as to increase the output level of the band called up each time the pressing operation is performed, and to decrease the output level of the band called up each time the setting button 12b is pressed.

The frequency equalizer is basically composed of a polysilicon resistance pattern for each frequency band and a plurality of MOS type switches connected between the patterns, and by opening and closing an external reactance element and a MOS type switch. The output level of each band is determined by the combined resistance of the selected polysilicon resistors.

In the above structure, when the frequency call buttons 11a and 11b in the key matrix 1 are used to call a frequency of 60 Hz, for example, and the level setting button 12a is pressed for two steps, the RAM 2b has storage locations corresponding to (x _{0 to} y ₈ ). "1" is written to. Similarly, +125 steps at 125Hz, +1 step at 250Hz ... + 4 at 16KHz
When you operate like a step etc., (x ₁ ~
_{y 10), (x 2 ~y} 7) ...... ( logic in a position corresponding to x ₈ ~y ₁₀₎ "1" is written.

The information written in this RAM2b is stored in the display driver circuit 2
The analyzer switches in c are operated to light each segment of the fluorescent display tube as shown in FIG.

Similarly, the information written in the RAM 2b is also given to the frequency equalizer 3, and the MOS provided in each frequency band is provided.
The type switch is operated, and the output level of each frequency band is controlled by the polysilicon resistance.

Therefore, the frequency characteristic at this time is graphically displayed as shown in FIG. 3, and the reproduction frequency characteristic 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 added to the display driver 2c, and the display driver 2c takes the output data from the level detection circuit 7. Will be crowded.

The level detection circuit divides the audio band into nine, detects the respective output levels, and sends the lighting level data to the display driver 2c.

Therefore, the lighting segment of each block constituted by x ₀ to x ₈ of the display 6 is y ₀ to y depending on its input level.
It lights up in a bar graph in ₁₂ directions and acts as a spectrum analyzer.

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

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

FIG. 4 shows the outline of the display operation. When the switch 9 is turned on, the display 6 first lights up the central segment (x ₄ , y ₆ ) as shown in FIG. 4 (A). Then, the lights are turned on in such a manner that the bands extend in the outward direction on both sides, and the lights are turned on as if a horizontal straight wall is formed in the center as shown in FIG. 4 (B). As the next step, as shown in FIG. 4 (C), the segments of x ₄ and y ₁₁ as well as the segments of x ₈ and y ₄ are turned on, and as the next step, FIG. 4 (D)
As shown in, the x ₅ and y ₁₀ segments and the x ₇ and y ₅ segments light up.

FIG. 4 (E) shows the lighting state (x ₅ ,
y ₃ ) (x ₇ , y ₈ ).

That is, the upper and lower lighting segments are sequentially lit in a ball-like operation by sandwiching a wall formed in a straight line in the center.

FIG. 5 is a flowchart showing the operation of the controller 2 for performing the above operation.

That is, when the demonstration mode starts, the control circuit 2a calls the display data to be turned on as shown in FIG. 4 (A) from the ROM 2d (step 1). Next, it is judged whether or not the page of the display data is as shown in FIG. 4 (B) (step 2), and if different, the display data is sent to the display 6 (step 3). Further, the page of the display data is incremented (step 4), the process returns to step 2 again, and the incremented page data becomes the fourth
It is determined whether or not the horizontal straight line lighting data shown in FIG. This is judged by incrementing four times, and then the data of the first page as the upper half data of the display 6 is called up (step 5), and the data of the first page as the lower half data is changed. The data is called (step 6). These two data are lit and displayed on the display 6 (step 7), and the fourth data is displayed.
It is displayed as shown in FIG. Then, the page of the display data of the upper half part and the lower half part is incremented by one step (step 8), and it is judged whether the display data of the upper half part has reached the end of a series of operations (step 9). If not, it is judged whether the display data of the lower half has reached the end of a series of operations (step 10).

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

When the above operation is continued and the display data in the upper half reaches the final data, the upper half data is returned to the original data of the first page (step 11), and the display data in the lower half becomes the final data. Then, the lower half data is returned to the original first page data (step 12) and the same operation is repeated.

The above description shows a series of display modes that operate when the mode selection switch 9 is turned on. For example, as shown by the broken line in FIG. 1, a state in which the input audio level is below a predetermined value is detected for a predetermined time or longer. At this time, the operation described above may be automatically switched.

FIG. 6 shows the display routine. First, it is judged whether or not the mode is the spectrum analyzer mode (that is, the switch 8 in FIG. 1 is on) (step 20). If not in the spectrum analyzer mode, the display 6 displays a graphic equalizer (step 21). In 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 the predetermined level, the timer counter is set (step 23) and the spectrum analyzer display mode (step 24) is set.

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

Further, in step 27, it is judged whether or not the value of the counter has reached the predetermined value n, and if it reaches the predetermined value n, the demonstration mode display is started (step 28). If the value of the counter does not reach the predetermined value n also in step 27, the process returns to step 20, and again in step 25, it is judged whether or not the predetermined value n has passed, and if it has passed n, the demonstration mode. To display.

As described above, if the signal level is above the predetermined level, the spectrum analyzer display mode is immediately entered, and if the signal level remains below the predetermined level for, for example, 20 seconds or longer, it is automatically switched to the demonstration mode display mode. .

[Effect]

As described above, according to the present invention, when the system is not used, the predetermined display mode can be manually displayed, and when the audio input level continues to be below the predetermined level, the predetermined display mode is automatically set. Since it is configured to switch to the display mode, it has the unique effect of being able to enjoy its visual effects.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a front view showing the structure of a display used in the present invention, and FIG. 3 is a front view showing the external appearance of a product to which the present invention is applied. FIG. 4 is a front view showing a lighting state of the display, FIGS. 5 and 6 are flow charts for explaining the operation of the present invention, and FIG. 7 is a block diagram showing an example of a conventional one. 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.

Claims (2)

[Claims] 1. A display device having a plurality of display segments, each of which is arranged in each of vertical and horizontal columns and which can be displayed / hidden for each segment, and an audio band divided into a plurality of frequency bands. A level detection circuit that generates an output that indicates the signal level for each frequency band, and one of the columns of vertical or horizontal segments of the display device described above is assigned for each frequency band, and a signal for each frequency band is assigned. First display mode control means for controlling so as to selectively turn on a plurality of vertical or horizontal display segments belonging to one column assigned to the frequency band according to an output from the level detection circuit indicating a level. And a plurality of display segments of the display device are predetermined by a lighting routine stored in a storage element. Second controlling to sequentially light up according to that pattern
A display device for audio equipment, comprising: a display mode control means; and a selection key for selecting and operating the first display mode control means and the second display mode control means. 2. A display device having a plurality of display segments, each of which is arranged in each of vertical and horizontal columns and which can be displayed / hidden for each segment, and an audio band divided into a plurality of frequency bands. A level detection circuit that generates an output that indicates the signal level for each frequency band, and one of the columns of vertical or horizontal segments of the display device described above is assigned for each frequency band, and a signal for each frequency band is assigned. First display mode control means for controlling so as to selectively turn on a plurality of vertical or horizontal display segments belonging to one column assigned to the frequency band according to an output from the level detection circuit indicating a level. And a plurality of display segments of the display device are predetermined by a lighting routine stored in a storage element. Second controlling to sequentially light up according to that pattern
The display mode control means, the input level detection means for detecting the input level of the audio signal, and the period when the input level detection means detects that the input level of the audio signal is below a predetermined level exceeds a predetermined period. And a switching means for switching from the control by the first display mode control means to the control by the second display mode control means when continued.