JPH06103817B2 - Electronic graphic equalizer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electronic graphic equalizer (hereinafter, abbreviated as electronic EQ in the present specification) capable of rewriting several kinds of stored equalizer patterns.

[Summary of the Invention] In an electronic EQ capable of storing several types of equalizer patterns, a pattern switching means and a manual adjusting means are provided, and these means make it possible to easily call and rewrite the pattern. There is.

[Prior Art] The initial state of an electronic EQ that can store several types of equalizer patterns desired by a user is usually a defeet state (±
0 dB state). It is very convenient in that you can freely create sounds.

4 (a) and 4 (b) are block diagrams showing the configuration of such a conventional electronic EQ. In the figure, 1 is a pattern switching button, 2 is an equalizer amount increase / decrease button, 3 is a frequency switching button, and 5 is Memory enable button, 6 memory button, 8 display, 9 CPU such as microcomputer, 10 RAM, 11 ROM, 12 EQ circuit, 13 input, 1
4 represents the output. The CPU 9 changes the frequency characteristic of the EQ circuit 12 according to the equalizer pattern called from the ROM or RAM as described later, and rewrites the pattern stored in the ROM or RAM. The initial state of the equalizer pattern after the power is turned on can be selected and called by the pattern switching button 1. To change the contents, the button 1 or the corresponding memory button 6 is turned on to call the desired pattern and the frequency switching button is pressed. The frequency to be changed is selected with 3, the boost / cut amount is adjusted with the increase / decrease button 2, the memory enable button 5 is turned on, and the memory button 6 is turned on to write in the corresponding area of the RAM 10.
By such an operation, the user can freely store the favorite pattern set as described above in each area of the RAM 10.

FIG. 5 (a) is a flowchart showing the operation of the apparatus shown in FIG. 4 (a).

The stator electronic EQ of FIG. 4 (b) does not have a RAM because the equalizer characteristic is fixed. The ROM 11 stores, for example, the patterns shown in FIGS. 6 and 7, and the pattern of the ROM 11 can be called by the pattern switching button 1. FIG. 5 (b) is a flow chart showing the operation of the apparatus of FIG. 4 (b).

[Problems to be Solved by the Invention] However, with the above configuration, it is troublesome to operate the memory button and the memory enable button to increase or decrease the amplification degree of each frequency. It is dangerous to perform such an operation while driving a vehicle audio device. Further, the memory button and the memory enable button must be provided on the panel surface, which is also disadvantageous in terms of space.
On the other hand, the fixed-type electronic EQ has several types of equalizer patterns determined in advance, and although it is easy to operate, there are cases where the sound does not suit you or the equalizer effect varies depending on the vehicle.

[Object of the Invention] An object of the present invention is to provide an electronic equalizer in which several kinds of equalizer patterns are stored in advance, the patterns can be adjusted by a simple manual operation, and the space for arranging buttons on the pattern surface can be saved. Is.

[Means for Solving the Problems] In order to achieve the above object, an electronic graphic equalizer according to the present invention has a plurality of frequency characteristic patterns for selecting a plurality of frequency characteristic patterns set in an equalizer circuit. Pattern switching means having a plurality of corresponding pattern switching buttons, first storage means having a ROM for storing data of a plurality of frequency characteristic patterns corresponding to the plurality of frequency characteristic patterns, and set in the equalizer circuit. A pattern adjusting means for adjusting the level of the selected frequency characteristic pattern for each selected frequency point; and a second storage area corresponding to the plurality of frequency characteristic pattern data stored in the first storing means.
And the data of the frequency characteristic pattern set in the equalizer circuit by the operation of the pattern switching button and adjusted by the pattern adjusting means, in the second storage means corresponding to the operated pattern switching button. And a control unit having a pattern rewriting function for writing in a storage area and a pattern setting function for reading out data of a frequency characteristic pattern from the first or second storage unit and setting it in the equalizer circuit by operating the pattern switching button. Use as a summary.

[Operation] Several kinds of equalizer patterns are stored in the initial state after the power is turned on, and these patterns can be freely rewritten and recalled by a simple operation of the pattern switching means and the pattern adjusting means.

[Examples] Hereinafter, the present invention will be described in more detail using examples with reference to the drawings. However, these are merely examples, and various modifications and improvements can be made without departing from the scope of the present invention. Of course it is possible.

FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic equalizer according to the present invention. In the figure, reference numerals common to FIG. 4 are the same as or corresponding to those in FIG. Reference numeral 4 represents a frequency display, and 7 represents a reset button. As is clear from the figure, the conventional memory enable button and memory button are not provided.

The ROM area and RAM area correspond to one pattern switching button. RAM10 if there is data in RAM10
Data from RAM10, if there is no data in RAM10, ROM11
Call from. The reset button 7 is installed on the operation panel or the back of the device.

The operation of the above embodiment will be described below.

For example, assuming that the electronic EQ circuit 12 uses a seven-element equalizer, the points of each frequency that can be increased or decreased are 125Hz, 250Hz,
If 500Hz, 1kHz, 3kHz, 10kHz is selected, when selecting the pattern in Fig. 6, the bass may be too muffled depending on the type of speaker, the mounting position, and the vehicle. It may be better to lower it. This is similar to adjusting an ordinary electronic EQ. In this way, after turning on the power for the first time, you can select and call up several types of patterns (for example, patterns are set in ROM 11 for each genre such as JAZZ, ROCK, POPS, CLASSIC, etc.) with the pattern switch button 1. And, the contents can be freely rewritten.

That is, in the case of pattern rewriting, one of the pattern switching buttons 1 is turned on to call a desired pattern from the ROM 11, and the equalizer amount increase / decrease button 2 and the frequency switching button 3 are pressed to adjust the called pattern,
By turning on the one pattern switching button again, data is written in the area of the RAM 10 corresponding to the button. Then, if the same pattern switching button is turned on, the adjusted pattern can be retrieved from the RAM 11. The rewritten pattern is stored, for example, without returning to the initial state pattern unless all the power is turned off or the reset button 7 is pressed.

After adjusting the frequency pattern as described above, data is written in the corresponding RAM 10 only when the same pattern switching button is pressed. Therefore, in this example, when the frequency pattern is adjusted directly from the DEFEAT state, the pattern is not stored.

It should be noted that whether or not the data is written in the RAM 10 corresponding to each button is appropriately notified by turning on the display corresponding to the button or changing the display color.

FIG. 2 is a flowchart showing the above operation.

FIG. 3 is a flow chart showing the operation according to another embodiment. In this embodiment, the pattern switching button 1
The pressing time of is measured by the timer in CPU9, and if it is less than the reference value (0.5 seconds in the flowchart), RAM10 or ROM11
Call the data from. When the pressing continues for more than the reference value, the current frequency pattern is written in the area of the RAM 10 corresponding to the pressed pattern switching button.

As a result, the drawback of the embodiment shown in FIG. 2 can be overcome, and the adjusted pattern data can be written in the RAM 10 even when the adjustment is made from the DEFEAT state.

In the first embodiment, by pressing the reset button 7,
While all the RAM10 was cleared, the contents of the RAM area corresponding to each pattern switching button can be cleared to overcome a new problem.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain an electronic EQ having a character intermediate between that of a fixed equalizer and an ordinary equalizer, and to improve the operability by reducing the number of operation buttons from the panel surface. Also, there is an advantage that space can be saved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an electronic EQ according to the present invention,
FIG. 2 is a flowchart showing the operation of the apparatus shown in FIG. 1 according to the first embodiment, and FIG. 3 is a first flowchart according to the second embodiment.
FIG. 4 is a flow chart showing the operation of the device shown in FIG. 4, FIG. 4 is a block diagram showing the configuration of a conventional electronic EQ, FIG. 5 is a flow chart showing the operation of the device shown in FIG. 4, and FIGS. 6 and 7 are fixed. 3 is a frequency characteristic diagram showing an example of the equalizer pattern of FIG. 1 ... Pattern switching button, 2 ... Equalizer amount increase / decrease button, 3 ... Frequency switching button, 4 ... Frequency display, 8 ... Display, 9 ... CPU, 10 ... RAM, 11 ... RO
M, 12 …… EQ circuit, 13 …… input, 14 …… output.

Claims (1)

[Claims] 1. A pattern switching unit having a plurality of pattern switching buttons respectively corresponding to the plurality of frequency characteristic patterns for selecting a plurality of frequency characteristic patterns set in an equalizer circuit, and the plurality of frequency characteristic patterns. A first storage means having a ROM for storing data of a plurality of frequency characteristic patterns corresponding to, and a pattern adjusting means for adjusting the level of each frequency point of the frequency characteristic pattern set in the equalizer circuit. Second storage means having a storage area corresponding to the plurality of frequency characteristic pattern data stored in the first storage means, and an equalizer circuit set by the operation of the pattern switching button and adjusted by the pattern adjustment means. Data of the frequency characteristic pattern that has been The pattern setting function for reading the frequency characteristic pattern data from the first or second storage means and setting the same in the equalizer circuit by the pattern rewriting function for writing in the storage area of the second storage means corresponding to An electronic graphic equalizer, comprising: a control unit having a function.