JPH0680994B2 - Equalizer device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equalizer device for controlling a sound field of a car stereo or the like.

2. Related Art FIG. 4 shows a conventional equalizer device.

In FIG. 4, 20 is a display element, and this display element 2
Are arranged in (7 columns) × (7 rows) to form a display device for displaying the equalizer characteristics. Reference numerals 21 and 22 are band switching switches. When the switch 21 is operated, it is switched to the low frequency side frequency band, and when the switch 22 is operated, it is switched to the high frequency side frequency band. Reference numeral 25 is a display element for displaying the selected frequency band, and the display element 25 is switched in conjunction with the operation of the switch 21 or 22. Reference numerals 23 and 24 are level switching switches. When the switch 23 is operated, it is switched to the display element 20 on the high level side, and when the switch 24 is operated, it is switched to the display element 20 on the low level side.

In the above conventional example, for example, when it is desired to change the level of the 1 kHz frequency band, first the switch 21 or 22 for frequency band switching is operated to switch to the 1 kHz frequency band, and then the switch 23 or 24 for level switching. The level was changed by switching to a desired level by operation.

However, in the above-mentioned conventional equalizer device, when the level of a predetermined frequency band is to be changed, first, the frequency band to be changed by operating the switches 21 and 22 for changing the frequency band. It is necessary to operate the switches 23 and 24 for selecting the level, the number of which is selected, and the number of switches is large, and the operation for changing the equalizer characteristic is complicated.

The present invention solves such a conventional problem and provides an equalizer device that does not require a switch for band switching.

Means for Solving the Problems In order to achieve the above object, the present invention provides an equalizer circuit for setting the levels of a plurality of frequency bands of an input acoustic signal, and a plurality of display elements arranged vertically and horizontally to provide a plurality of frequencies. While the display means for displaying each level of the band by lighting and the first switch is being operated, the frequency band of the equalizer circuit is continuously changed from the low frequency side to the high frequency side or from the high frequency side to the low frequency side. Equalizer control means for continuously changing the level of each frequency band from the low level side to the high level side or from the high level side to the low level side, and the frequency band and level selected when the first switch is turned off And a corresponding display element of the display means in conjunction with the frequency band switching and level switching of the equalizer control means. And a display control means for switching lighting of.

Operation The present invention has the above-described configuration, and when the first switch is operated, the frequency band of the equalizer circuit is switched to a predetermined direction (from the low frequency side to the high frequency side or from the high frequency side to the low frequency side) by the equalizer control means. While being controlled, the level of each frequency band is continuously changed in a predetermined direction (from the low level side to the high level side or from the high level side to the low level side). Since the display element of the display means can be switched on or off in conjunction with the frequency band switching or level switching operation of the equalizer control means, by visually observing the lighting display element of this display means, the currently selected frequency band is selected. , I know the level. When the first switch is turned off when the lighting display element of the display means reaches a desired level in a desired frequency band, switching of the frequency band and switching of the level are stopped. When the second switch is operated here, the currently selected frequency band and level are set.

Embodiment FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 is an equalizer characteristic display device, and a liquid crystal display device or the like is used as the equalizer characteristic display device 1. 2 is a display element, and the plurality of display elements 2 are (7 columns) × (7
Rows) are arranged. The display element group of the first row (X ₁ ) is 63Hz
Is for the level display of 2nd row (X ₂ ), 3rd row (X ₃ ), 4th row (X ₄ ), 5th row (X ₅ ), 6th row (X ₆ ),
The 7th row (X ₇ ) is 250Hz, 500Hz, 1kHz, 1.8kH respectively
The display element group for level display of the z, 4 kHz, and 10 kHz frequency bands is shown. Numerals 3 and 4 are push buttons for moving the cursor as a first switch operated when selecting a desired frequency band and level, respectively. When the push buttons 3 and 4 are pushed, the switches 3S and 4S are turned on. Reference numeral 5 is a push button for level setting as a second switch operated when setting the selected frequency band and level, and when this push button 5 is pushed, the switch 5S is turned on. 7 is a central processing unit (CPU),
8 is a random access memory (RAM), 9 is a read only memory (ROM), 10 is a multiplexer for selecting a frequency band (X _{1 to} X ₇ ) based on frequency band switching data output from the CPU 7, 11 is a CPU 7 It is a multiplexer for selecting a level (Y _{1 to} Y ₇ ) based on the level switching data output from the display element 2 selected by both multiplexers 10 and 11.

12 is an input terminal to which an acoustic signal is applied, 13 is an operational amplifier,
V _{1 to} V ₇ are electronic potentiometers connected in parallel between the output terminal and the (−) input terminal of the operational amplifier 13, and R _{1 to} R ₇ are 63 Hz, 250 Hz, 500 Hz, 1 kHz, 1.8 kHz, 4 kHz, respectively. This is a resonance circuit that resonates at 10 kHz, and an equalizer circuit is configured by the operational amplifier 13, electronic volumes V _{1 to} V ₇ , and resonance circuits R _{1 to} R ₇ . Reference numeral 14 denotes an electronic volume setting circuit. The electronic volume setting circuit 14 sets predetermined electronic volumes V _{1 to} V ₇ to predetermined levels based on frequency band selection data and level setting data output from the CPU 7. Reference numeral 15 is a power amplifier, and 16 is a speaker.

Next, the operation of this embodiment will be described. Now, assume that the level of each frequency band is set to the "0" level as shown in FIG. 2A. To change the equalizer characteristic shown in FIG. 2A, push button 3 or 4 is pushed. For example, push button 3
When is pressed, switch 3S is turned on, the cursor data stored in RAM8 is read out sequentially, and CPU7
Frequency band switching data and level switching data are output to 10 and 11, respectively, and the cursor 17 moves in the arrow direction (UP direction) as shown in FIG. 2B. This movement of the cursor 17 is performed while the push button 3 is being pressed, and the cursor 17
After reaching the maximum level (Y ₇₎ of the frequency band (X _7), then proceeds to the minimum level (Y ₁₎ of the 63Hz frequency band (X _1). When the push button 3 is kept pressed and the cursor 17 reaches the position shown in FIG. 2C (+8 dB in the 63 Hz frequency band), the push button 3 is released and the switch 3S is turned off, the cursor 17 is shown in FIG. 3C. Stop at position. When the push button 5 for level setting is pressed and the switch 5S is turned on, the level set value display of the 63 Hz frequency band (X ₁ ) is switched from "0" to "+8" as shown in FIG. The set value of the electronic volume V ₁ for the 63Hz frequency band (X ₁ ) shown in Fig. ₁ is "0".
Changed to "+8". In this way, when changing the equalizer characteristic, the push button 3 is pressed, the cursor 17 is moved to a predetermined level in a predetermined frequency band, and the level setting push button 5 is pressed. When the push button 3 is pressed again in the state shown in Fig. 2D, the cursor 17 starts moving from "+8" in the 63Hz frequency band and shifts to the 250Hz frequency band (X ₂ ) as shown in Fig. 2E. To do. When the cursor 17 reaches "+4" in the 250Hz frequency band, turn off the switch 3S and press the pushbutton 5 for level setting.
The setting level of the frequency band is changed from "0" to "+4". The level of each frequency band can be changed by the same operation. 2F shows the moving direction (DOWN) of the cursor 17 when the push button 4 for moving the cursor is pressed.
Is shown.

As described above, in this embodiment, the push button 3 or 4 is pressed to move the cursor.
17 is moved up or down, the cursor 17 is moved to a predetermined level in a predetermined frequency band, and the push button 5 for setting the level
By pressing, the equalizer characteristics can be changed.

FIG. 3 shows the procedure for setting the equalizer characteristics of this embodiment. In FIG. 3, it is determined in step a whether or not the cursor moving switches 3S and 4S are ON, and if YES is determined, it is determined in step b whether or not the cursor UP switch 3S is ON, If YES, move the cursor to U in step c.
If P is displayed, if NO, the cursor is displayed DOWN in step d. Next, in step e, it is determined whether or not the level setting switch 5S is ON, and if YES is determined, the level of the electronic volume of the corresponding band of the equalizer circuit is set in step f, and if NO is determined, step In g, it is judged whether or not the current level is ± 12 dB. If YES, the frequency band is switched in step h.

EFFECTS OF THE INVENTION As apparent from the above-described embodiment, the present invention eliminates the need for using two switches, a frequency band selection switch and a level selection switch for a selected frequency band, unlike the conventional example. By operating one switch, a desired frequency band can be changed to a desired level, which has the advantage of simplifying the configuration.

[Brief description of drawings]

FIG. 1 is a block diagram of an equalizer device according to an embodiment of the present invention, FIGS. 2A to 2F are explanatory views of the operation of the device, FIG. 3 is a flowchart showing a procedure for setting equalizer characteristics of the device, and FIG. FIG. 6 is an explanatory diagram showing a conventional equalizer device. 1 ... equalizer characteristic display device, 2 ... display element, 3,
4 ... Push button for moving cursor, 3S, 4S ... Switch for moving cursor, 5 ... Push button for level setting, 5S ... Switch for level setting, 7 ... Central processing unit (CPU), 8
...... Random access memory (RAM), 9 ...... Read only memory (ROM), 10, 11 ...... Multiplexer, 12
...... Input terminal, 13 …… Amplifier, 14 …… Electronic volume setting circuit, V _{1 to} V ₇ …… Electronic volume, R _{1 to} R ₇ …… Resonance circuit, 15 …… Power amplifier, 16 …… Speaker.

Claims (1)

[Claims] 1. An equalizer circuit for setting each level of a plurality of frequency bands, a display means for arranging a plurality of display elements vertically and horizontally to lightly display each level of a plurality of frequency bands, and operating a first switch. While the frequency band of the equalizer circuit is continuously changed from the low frequency side to the high frequency side or from the high frequency side to the low frequency side, the level of each frequency band is changed from the low level side to the high level side or the high level side. From the equalizer control means for continuously changing from the low level side to the low level side, a second switch for setting the frequency band and level selected in the equalizer circuit when the first switch is turned off, and the equalizer control means. An equalizer comprising display control means for switching lighting of a corresponding display element of the display means in conjunction with frequency band switching and level switching. Isa apparatus.