JPS6221313A - Display method for equalizing characteristic - Google Patents

Abstract

PURPOSE:To attain thin profile of an equalizing characteristic display section and to decrease number of display elements by lighting two adjacent display elements so as to display an intermediate value of a characteristic compensation quantity instructed by a display element onto the two adjacent display elements. CONSTITUTION:For example, five display elements for characteristic compensation display each are used for each frequency, and when the maximum characteristic compensation quantity is <=+6dB and the minimum characteristic compensation quantity is >=-6dB, the level interval between dots is selected as 3dB to display the characteristic compensation quantity. When the maximum characteristic compensation quantity is >=+6dB or the minimum characteristic compensation quantity is <=-6dB, the level interval between dots is selected as 6dB and the intermediate value (+ or -3,6dB) of the characteristic compensation quantity instructed by the two adjacent display elements is displayed by lighting the two adjacent display elements. Thus, the number of display elements is decreased and the profile of the equalizing characteristic display section is made thin.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an equalizing characteristic display method for discretely displaying the characteristic compensation amount in a graphic equalizer as dots for each frequency.

<Prior Art> A graphic equalizer sets a characteristic compensation amount for a plurality of frequencies to iIIm the frequency characteristic, and sets a desired overall equalizing characteristic.

Such a graphic equalizer includes operation keys for changing the output characteristics corresponding to each of a plurality of frequencies, and an equalizing characteristic display section that discretely displays the amount of characteristic compensation at each frequency using a display element such as an LED. and store the characteristic compensation amount at each frequency,
a control unit that updates the characteristic compensation amount of the frequency corresponding to the operation key by operating the operation key; and an equalizer circuit that controls the frequency characteristic based on the stored characteristic compensation amount;
The apparatus includes a display driver that causes the equalizing characteristic display section to display an equalizing curve based on the stored characteristic auxiliary injection amount at each frequency.

Now, a typical graphic equalizer is capable of changing the output characteristics by a maximum of +12 dB for each frequency in 2 dB or 3 dB steps. Therefore, when the equalizing characteristic display section displays the characteristic compensation amount in 3clB steps, for example, nine display elements LE are required for each of the frequencies f1 to f7, as shown in FIG. The equalizing curve (see the black circle in the figure) is displayed by lighting the display element corresponding to the amount of frequency characteristic compensation. In order to display the amount of characteristic compensation in 2 dB steps, 11 display elements LE are required for each frequency.

<Problems that the invention is trying to solve> As mentioned above,
The conventional equalizing characteristic display section displays 1 for each frequency.
Since one display element is required for each step, there are problems in that the number of display elements increases, resulting in higher costs and a thicker display section. In particular, since space is limited in car audio equipment, it is desirable to reduce the thickness of the graphic equalizer, but this has been difficult for the reasons mentioned above.

In light of the above, an object of the present invention is to provide an equalizing characteristic display method that can display the characteristic compensation amount for each frequency at the same level intervals as conventional methods, reduce the number of display elements, and reduce the thickness of the equalizing characteristic display section. It is to be.

Means for Solving the Problems> FIG. 1 is an explanatory diagram of the equalizing characteristic display method of the present invention.

105 is an equalizing characteristic display section, f1 to f7
5 display elements for each frequency, (i=
1, 2. ...7: j=1,2. ...5) are arranged in a matrix.

Normally, a graphic equalizer (2dB or 3dB) is used.
Although it is possible to change the maximum by +12 dB in B@ interval, in actual use, the characteristic compensation amount for a certain frequency must be +12 dB.
dB, and set the amount of characteristic compensation at another frequency to -12
Few people listen to music with the setting set to dB, and in most cases, the maximum characteristic compensation amount for each station wave number is +6 dB.
, the minimum characteristic compensation amount is about -6 dB, and the difference is 1
It is about 2 dB. Despite this, in the past, a total of nine display elements were provided at intervals of 3 dB for each frequency, resulting in a large number of unnecessary display elements (-6 dB, -9 dB), as shown in Figure 6. , +12 dB display elements are not lit).

Therefore, in the present invention, five display elements are used to display the amount of characteristic compensation for each frequency, and the maximum amount of characteristic compensation is +
6 dBa and the minimum characteristic compensation amount is 16 dB or more, display the characteristic compensation amount with the level interval between dots as 3 dB (see Figure 1 (A)), and the maximum characteristic compensation amount is +6 dB or more or minimum. When the amount of characteristic compensation is 16 dB or less, the level interval between the dots is set to 6 dB, and the intermediate value (±3, +9 dB) of the amount of characteristic compensation indicated by two adjacent display elements is set to 6 dB. The display element is lit to display the image (
(See Figure 1 (B)). By doing so, according to the present invention, it is possible to display the characteristic compensation amount at the same level intervals as in the past, that is, at 3 dB intervals, and it is also possible to reduce the number of display elements, and to reduce the thickness of the equalizing characteristic display section. can do.

In addition, when displaying the amount of characteristic compensation at intervals of 6 dBllll, the amount of characteristic compensation of -9 dB is displayed with the display elements of 16 dB and 12 dB, D, all lit, and the amount of characteristic compensation of -3 dB. are OdB and -6dB display elements, 3. D.
4 is lit and displayed, +3 dB characteristic compensation amount is Od
B and +6 dB display element 3; D, 2 is lit and displayed, +, 9 dB characteristic compensation amount is +6 dB and +
Display is made by lighting up the 12 dB display elements.

<Embodiment> FIG. 2 is a block diagram of a graphic equalizer that realizes the equalizing characteristic display method according to the present invention, and FIG. 3 is a surface diagram of the graphic equalizer.

101 is an equalizer circuit for compensating the frequency characteristics of the audio signal AS; 1031 is an operation unit having an up key and a down key for setting the characteristic compensation amount for each frequency; 104 is a control unit having a microcomputer configuration; Equalizing characteristic display section for displaying equalizing characteristics, 1
06ζ is a display driver.

As shown in FIG.
It has up keys UPKI to UPK7 and down keys DNKI to DNK7 for setting the amount of characteristic compensation at 10 KHz).

Up key UPKi (i=1 to 7) (increases the characteristic compensation amount of the corresponding frequency by 3 dB each time it is pressed, and similarly corresponds to each time the down key DNKi (i = 1 to 7) is pressed. The frequency characteristic compensation amount is reduced by 3 dB.
The maximum value of the characteristic compensation amount is +12 dB1 the minimum value is -12 dB
It is.

The control unit 104 has a microcomputer configuration, and includes a ROM 104a and a RAM 104b that store control programs.
, a processor 1040 that performs predetermined processing under the control of a control program, as well as input/output ports, bus lines, and the like.

Each frequency (60Hz.

125Hz, . . . 10KH2) are respectively stored, and these characteristic compensation amounts EQi are stored in the operating section 103.
It can be changed by operating each key provided on the screen.

That is, the up key UPKi corresponding to a predetermined frequency
Alternatively, if the down key DNKi is pressed, the processor 104C calculates the following formula % (1) (the sign depends on whether the up key or down key was pressed) every time it is pressed. The characteristic compensation amount EQi corresponding to the predetermined frequency is updated. In addition, equalizer times 1i
5101 is each characteristic compensation amount EQI.

E Q 2. ... EQ7 is input and the frequency characteristics are compensated.

In addition, RAM 104 b contains data on whether the display is performed at 3 dB intervals or 6 dB intervals, and the maximum level LrIAx (=6 dB) shown by the top display element when displaying at 3 dB intervals. and the minimum level LHIN (=-6 dB) shown by the lowest display element D15.
is memorized. Incidentally, such data will be used in the equalizing characteristic display processing described later.

The equalizing characteristic display section 105 displays each frequency f1 to f,
(60Hz, 125Hz, 250Hz, ...1
0KHz) characteristic compensation amount at 3 dB intervals or 6
It can be displayed appropriately in dB intervals. Furthermore, 3d
When displaying equalizing curves at intervals of B and 6d
When displaying the equalizing curve at intervals of B, both Od
The position indicating B is fixed at the central dot position. Also, 6
In the case of displaying at dB intervals, if the characteristic compensation amount exists between the two levels indicated by the two adjacent display elements, jSD, , J, or l, the two adjacent display elements Dij' Di lj+11 is turned on to display the amount of characteristic compensation, and when the amount of characteristic compensation is at the level indicated by the display element, only that display element is turned on. For example, for -9 dB, there are display elements of -6 dB and -12 dB, 4. Light up D.

The display driver 106 has a segment driver 106a and a digit driver 106b, and displays an equalizing curve on the equalizing characteristic display section 105 using display data corresponding to the characteristic compensation amounts EQI to EQ7 inputted from the control section 104. In addition, digit driver 10
6b is for each frequency (60Hz, ) 25 as shown in FIG.
A total of 7 segment drivers 106a (DD, ~DD,) are provided, one for each frequency (Hi, ... 10 KHz), and a total of 35 segment drivers 106a (SD, , ~SD,) are provided, five for each frequency. , 5.SD2°~SD2.
．．・ ・ ・ ・ ・SD, 〜SD, 5') is provided. And each digit driver DD, ~
DD is always driven to light up the display element, while segment drivers SD, . It is driven depending on whether the light is turned on or off.

FIG. 5 is a flow chart of equalizing characteristic display processing according to the present invention. The equalizing characteristic display method of the present invention will be explained below according to this flowchart. The display method of the present invention will be described assuming that equalizing curves are initially displayed at 3 dB intervals on the equalizing characteristic display section 105.

(a) Press the up key UPK or the down key DNK corresponding to the frequency for which you want to change the amount of characteristic compensation.

(The processor 104C of the bl control unit 104 determines whether the operated key is the up key.

(If it is the Cl up key, the processor updates the characteristic compensation amount EQl of the frequency corresponding to the operated up key using the following formula % formula %.

(dlThen, the processor checks whether EQi≦LMAx(2) holds.However, L M
AX is 6ciB.

(e) If formula (2) holds true, the total characteristic compensation amount at each frequency can be displayed at the current level interval without changing the level interval, so the processor can display the display data of the frequency corresponding to the operated up key. is advanced by one step and outputted to the display driver 106, the display element 1 that was turned on until now is turned off, and the display element 1. above is turned on instead. ,
Light up -0.

The display data is as follows: (1) If the top display element D11 is to be lit, "
(2) When the second display element from the top, 2, is lit, it is "01000"; (3) When the middle display element D13 is lit, it is '01000'.
(4) When lighting the second display element D14 from the bottom, it becomes "00010"; (5) When lighting the bottom display element D14, it becomes "00010";
00001”.

(fl (If Equation 21 does not hold, processor 1
04c changes the level interval between dots from 3dB interval to 6dB
Make it spaced. However, the center dot position is assumed to be the OdB position (see FIG. 1(B)). Furthermore, if the characteristic compensation amount for each frequency is fll+12 dB, the processor outputs 5-bit display data "10000" to the display driver 106, and if the characteristic compensation amount is (21+9 dB), the processor outputs display data '10000' to the display driver 106.
11000'' to the display driver 106, (if al+6dB, output the display data ``01000'', (if 41+3dB, output the display data ``01100'', (if 510dB, output the display data ``00100''). (7) If it is -6dB, it will output the display data "00010"; (If it is 81-9dB, it will output the display data "00011". (If 91-12ciB, display data “00001
” is output.

As a result, the equalizing curve is displayed as shown in FIG. 1(B).

(gl) On the other hand, if the key operated in step (1,) is the down key, the processor updates the frequency characteristic compensation 'lkE Q i corresponding to the operated down key using the following formula %.

(h) Next, the processor checks whether EQi≧L□N (3) holds true. However, L, □8
is -6 dB.

+1) If formula [3] holds true, the amount of characteristic compensation at each frequency can be displayed at the current level interval without changing the level interval, so the processor changes the display data of the frequency corresponding to the operated down key. and outputs it to the display driver 106, turns off the display element D i j that has been lit up until now, and turns on the display element one below instead, (
Turn on J+l+.

+kl (If formula 31 does not hold, processor 1
04a, the level interval is changed from 3 dB interval to 6 dB interval and the equalizing curve is displayed on the equalizing characteristic display section 105, as in step (f).

In the above explanation, the characteristic compensation amount is initially displayed at 3 dB intervals, but it may be initially displayed at 6 clB intervals. In such a case, processing is carried out according to the flowchart shown in FIG. That is, [Press the up key UPK or down key DNK corresponding to the frequency for which you want to change the Al characteristic compensation amount.

(The processor 104a of the bl control unit 104 determines whether the operated key is the up key.

(C) If it is an up key, the processor updates the characteristic compensation amount EQ1 of the frequency corresponding to the operated up key using the following formula %.

[dl If the operated key is a down key, the processor 104 calculates the frequency characteristic compensation amount EQ corresponding to the down key.
Update i using the following formula % formula %.

(e) Next, the processor determines the maximum characteristic compensation amount EQ, □
and find the minimum characteristic compensation amount EQMIN.

[f) Once the maximum and minimum characteristic compensation amounts are determined, the processor checks whether the following equation (4) holds true.

(g) If equation (4) holds true, the amount of characteristic compensation is displayed with the level interval set to 3 dB.

(hl (If formula 41 does not hold, set the level interval to 6d.
The characteristic compensation amount is displayed as B.

Although only the lighting control of the display element has been described above, the scale display of the characteristic compensation amount may be changed at the same time according to the level interval.

<Effects of the Invention> According to the present invention, when the level interval between dots is the first value and the maximum and minimum characteristic compensation amounts can be displayed simultaneously on the display section, the level interval is set to the first value and the characteristic is Display the compensation amount, and if the maximum and minimum characteristic compensation amount cannot be displayed simultaneously on the display with the first value of the level interval between dots, set the level interval between dots to a second value larger than the first value. At the same time, since the intermediate value of the characteristic compensation amount indicated by two adjacent display elements is displayed by lighting up the two adjacent display elements, the characteristics of each frequency can be adjusted at the same level interval as before. The amount of compensation can be displayed, the number of display elements can be reduced, and the thickness of the equalizing characteristic display section can be made thinner.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram explaining the equalizing characteristic display method of the present invention, Fig. 2 is a block diagram of a graphic equalizer to which the present invention is applied, Fig. 3 is a panel surface diagram of the graphic equalizer, and Fig. 4 is a diagram of the display driver. FIG. 5 is a flowchart of a process according to the present invention, FIG. 6 is a flowchart of another process according to the present invention, and FIG. 7 is an explanatory diagram of a conventional equalizing characteristic display section. 101... Equalizer circuit 1. 103...Operation unit, 104...Control unit, 105...Equalizing characteristic display unit 106...Display driver, 106a...Segment driver, 106b...Digit driver, UPK...Up key, DNK,...Down key D
+4...Display device patent applicant Alpine Co., Ltd. agent Patent attorney Chikan Saito 'rx
-! rs Shi 5gi & 6 □ 'IIJ (Bn 7 figure 6, I, also f4f-r'rg fr 1000Z

Claims (1)

[Claims] (1) In an equalizing characteristic display method in which the amount of characteristic compensation for changing the output characteristics corresponding to each of a plurality of frequencies is discretely displayed as dots for each frequency, the level interval between the dots is equal to the first value. If the maximum and minimum characteristic compensation amount can be displayed simultaneously on the display, the characteristic compensation amount is displayed with the level interval as the first value, and when the level interval between dots is the first value, the maximum and minimum characteristics are displayed. If the amount of compensation cannot be displayed simultaneously on the display section, the level interval between the dots is set to a second value larger than the first value, and the intermediate value of the amount of characteristic compensation indicated by two adjacent display elements is set to the adjacent value. An equalizing characteristic display method characterized by lighting up two display elements to display an equalizing characteristic.