JPS6165613A - Graphic equalizer - Google Patents

Abstract

PURPOSE:To set a level of a graphic equalizer more quickly than a conventional level setting method by providing a frequency setting cursor switch moved in interlocking with a level of the preceding center frequency at level setting. CONSTITUTION:When the center frequency is at the position of 44 and its level is at the position of 46 (level '6') and when the center frequency is moved to an adjacent frequency 45 and set to the position of 47 (level '8'), the level is moved in parallel to the position 46 (level '6') without bringing the level to '0', and set to the position 48 (level '6') and then the level is increased by 1 to be set to the position 47 (level '8'). Cursor switches 49, 50 are switches for setting the center frequency, switches 51, 52 for setting the level are cursor switches in interlocking the center frequency setting level where the cursor switches 53, 54 are set to the preceding center frequency level in parallel movement.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronically controllable Goura quick equalizer, and is particularly designed to facilitate level setting operations.

(Constitution of Conventional Example and Its Problems) FIG. 1 shows a block diagram of an example of the configuration of a conventional electronically controlled graphic equalizer.

1 is a signal input terminal, 2 is a buffer amplifier, 5 is a subtracter, and 3 and 4 are resistors for determining the subtraction ratio.

8 is an adder, 6 and 7 are resistors for determining the addition ratio,
9 is a signal output terminal, 10 is an inverter, 11, 12, 13 is a band pass filter that appropriately divides the audio band necessary for determining the frequency characteristics of the graphic equalizer, 14 is a group of these filters, 15, 1
6.17 is an electronically controlled attenuator, 18 is a group of these attenuators, 19, 20.21 is a switch for switching whether the output of the attenuator group 18 is input to the subtracter 5 or the adder 8. , 22 is a group of these switches, 23 is a microcomputer for setting the level of each of the electronically controlled attenuator group 18, 24, 25, 26 .
27 is a switch for instructing which attenuator in the electronically controlled attenuator group 18 is to be attenuated and by how much; 29 is a display that displays the current level of each frequency band of the graphic equalizer; 28 is a display drive circuit for receiving the output of the microcomputer 23 and displaying the display on the display 29.

Now, for example, the output of the electronically controlled attenuator 15 changes in several stages as shown in FIG. The characteristics shown in a) are obtained, and the adder 8
It is well known that if the characteristics are added to , the characteristics shown in FIG. 3(b) will be obtained. As a method of controlling the attenuator group 18, there is a method of providing level up and down command keys for each attenuator, but the number of attenuators (number of divided frequencies)
When the number of keys increases to 20 to 30, it becomes difficult to arrange the keys on the set panel, so the frequency lowering command to select the divided center frequency as shown in Figure 4 is used. A switch 31, a rise command switch 32,
Level increase command switch 33, level decrease command switch 34
A practical method is to provide the level setting cursor switch 30. That is, the switches 24, 25,
26.27 is the cursor switch 31, 32, 3 in Fig. 4
3 and 34. For example, the electronically controlled attenuator group 18 in FIG. 1 may have a configuration as shown in FIG. 5. In FIG.
7 is a latch signal line, 38 is a group of electronic switches, 39 is a group of resistors, 40 is a feedback resistor of an inverting amplifier 41, and level control data 36 given from the microcomputer is latched into the latch circuit 35 via a latch signal line 37. The output turns on and off which switch in the electronic switch group 38.
It is also well known that if the value of the resistor group 39 is appropriately selected, the gain of the inverting amplifier 41 is determined by the ratio of the combined parallel resistance value and the feedback resistor 40. In other words, by inputting the center frequency setting cursor switch shown in Fig. 4, 31.
By sequentially sending latch pulses to , and at the same time applying the level control data 36 shown in Figure 5 in synchronization with the above latch pulses by inputting the level setting cursor switches shown in Figure 4, 33 and 34, any center frequency can be set to any level. Can be set to .

FIG. 6 shows a software processing procedure of the microcomputer shown in FIG. 1 to carry out this series of operations. The counter in FIG. 6 means a well-known counter that is counted by software in the RAM in the microcomputer.

However, when using the above procedure to set the level of all center frequencies from a flat state ("o'" level) as shown in FIG. 7 42 to a gentle characteristic as shown in FIG. 7 43, the center frequency “0” every time you move
Since the processing procedure shown in FIG. 6 is repeated until the level reaches a predetermined level, there is an inconvenience that the level increase command switch 33 shown in FIG. 4 must be kept pressed, which takes time.

(Objective of the Invention) The present invention provides a means for improving the level setting time of such an electronically controlled graphic equalizer.

(Structure of the Invention) In order to achieve the above object, the present invention provides a pair of frequency increase and decrease command switches in addition to the frequency increase and decrease command switches with the conventional function as a cursor switch for setting the center frequency. When the center frequency is moved to the next center frequency using a switch, the microcomputer software is configured so that the level setting position is automatically set to the level before the move, and the level is increased by the necessary level from that state. , the level can be set more quickly than the conventional example by pressing the lowering command switch.

(Description of Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 8 is a state diagram of level setting of the graphic equalizer of the present invention. In other words, if the center frequency is currently at position 44 and its level is at position 46 (level "6"), move it to the adjacent center frequency 45 and move it to position 47 (level "6").
When setting the level to "118"), as shown in Figure 7, do not set it to the "0" level, but move it in parallel at the 46th position (level 6'") to the 48th position (level 16").
If you set it to , and then increase the level by +1 and move it to position 47 (level "'8"), the number of loops of the procedure in Figure 6 will be reduced compared to the method in Figure 7, and you can set the level faster. is obvious. Figure 9 shows the layout of the level setting cursor with this method taken into account, with cursor switch 49.5.
0 is the center frequency setting switch similar to Fig. 4 31.32, 51.52 is the level setting switch similar to Fig. 4 33.34, and the cursor switch 53.54 is based on the above contents. This is a level-linked cursor switch for setting the center frequency that allows the level to be set while moving parallel to the level of the previous center frequency.If you arrange the cursor switch as shown in Figure 9, you can use the index finger and ring finger to The user can easily move the frequency and set the level using the middle finger, and can also freely select and use the level to move parallel to the previous center frequency level, greatly improving operability.

FIG. 10 shows a microcomputer processing procedure using a cursor switch according to the present invention. In other words, the difference with Fig. 6 is that only when the cursor switch (53 and 54 in Fig. 9) linked to the level of the previous center frequency is pressed, the level setting counter in the microcomputer displays the level at the previous center frequency. It is easy to understand that the same level is set as .

As for the circuit, it goes without saying that in the block diagram of FIG. 1, two level interlocking switches are added to the switches 24 to 27 connected to the microcomputer 23.

(Effects of the Invention) As described above, the present invention provides a frequency setting cursor switch that moves in conjunction with the level of the previous center frequency when setting the level of the graphic equalizer. It becomes possible to set the level of

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional electronic graphic equalizer, Figure 2 is a diagram showing the output characteristics of the attenuator in Figure 1,
Figure 3 shows an example of the frequency characteristics of a graphic equalizer, Figure 4 shows an example of a level setting cursor switch placed on the panel of a conventional graphic equalizer, and Figure 5 shows an example of an electronically controlled attenuator. 6 is a diagram showing the processing procedure of a microcomputer using a conventional level setting cursor switch, FIG. 7 is a conventional level setting state diagram, FIG. 8 is a level setting state diagram of the present invention, and FIG. 9 1 is a diagram of the level setting cursor switch of the graphic equalizer of the present invention, and FIG. 1θ is a diagram showing the processing procedure of the microcomputer using the level setting cursor of the present invention. 30... Level setting cursor switch, 31, 32
．． "49.50...Switch for center frequency setting. 33.34.51.52... Switch for level setting. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 49 'll ')tJ Figure 10

Claims (2)

[Claims] (1) Electronic control graphic that has a frequency setting cursor switch for raising and lowering the frequency and a cursor switch for setting the level for raising and lowering the level as control input means, and can set any frequency band to any level. An equalizer for raising and lowering frequencies that can automatically set the level to the same level as the level immediately before the movement when moving from a frequency band whose level has already been set to an adjacent frequency band and setting the level. A graphic equalizer featuring a cursor switch. (2) Place the above cursor switches with level up and down switches above and below the center, and a normal frequency up and down cursor switch and a frequency up and down cursor switch that matches the level just before the movement. The graphic equalizer according to claim 1, wherein the graphic equalizer is arranged on both sides of the level up/down cursor switch.