JPH0741031Y2 - Electronic graph equalizer device - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention divides an audio band into several parts, and based on the data of the glyco curves selected from a plurality of glyco curves stored in a memory, The present invention relates to an electronic graphic equalizer device device that increases or attenuates a level and displays the state so that it can be visually known.

[Technical background of the device and its problems]

As a conventional device of this type, there is a device in which the display of the glyco curve and the display of the spectrum analyzer (spectrum analyzing) can be selectively performed by switching. 5 and 6 show the states of the graphic display and spectrum analyzer display of this conventional device. In this device, data corresponding to each band of the graphic display is stored in the memory, and the level of each band can be adjusted.

The level of each band can be adjusted by using a frequency selection button and an up / down button (not shown) to raise or lower the level of the displayed frequency. Further, the switching button can be used to display the spectrum analyzer instead of the graphic display or at the same time as the graphic display.

Although the spectrum analyzer display can cope with this with a relatively simple circuit even if the number of divided bands, that is, the number of bands is large, in the case of the glyco curve, a relatively complicated circuit is required for each band. In the conventional configuration described above,
As the number of bands increases, the number of complicated circuits must be increased, resulting in a significant cost increase.

In order to eliminate such a defect, the number of bands that can be actually changed may be reduced rather than the number of display bands, but this causes another problem that the display is performed in discrete bands and the display quality deteriorates. Will occur.

[Purpose of device]

The present invention has been made in order to eliminate the above-mentioned drawbacks of the related art, and an object thereof is to provide an electronic graphic equalizer device in which the number of actually variable bands is reduced rather than the number of display bands to reduce the cost. There is.

[Outline of device]

In order to achieve the above object, the electronic graphic equalizer device according to the present invention makes the number of bands of the data of the glycocurve stored in the storage means smaller than the number of display bands of the spectrum analyzer level, and stores it in the storage means at the time of displaying the glycocurve. The display data is greatly impaired by the display data forming means forming the display data of the band which is not displayed on the basis of the data calculated by the data of the band adjacent to the band stored in the storage means. Instead, the circuitry related to the glyco is reduced to reduce the cost.

[Example of device]

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an electronic graphic equalizer device according to the present invention applied to a tape player. In the figure, an L-ch (channel) audio signal read from a magnetic tape by a reproducing head 1 is shown. The R-ch (channel) audio signal output via the amplifier 2, FEQ (frequency equalizer) 3, the fader 4 and the isolator 5 and read by the reproducing head 11 is also the amplifier 12, FEQ 13, The signal is output via the fader 14 and the isolator 15.

On the other hand, a frequency analysis circuit 21 is connected to the outputs of FEQ3 and 13.

The frequency analysis circuit 21 is connected to the mixer 21a that mixes the output signals of the EEQs 3 and 13, the ALC (automatic level adjustment) circuit 21b that adjusts the level of the signal output from the mixer 21a, and the output of the ALC circuit 21b. And the center frequencies are different (60,125,250,5
00,1K, 2K, 4K, 8K, 16K [Hz]) Filter and rectifier circuit 21c consisting of 9 BPFs (bandpass filters) and rectifiers
And a selection circuit 21d that selects any one of the nine BPF outputs of the filter circuit 21c, and a comparator that compares the level of the DC signal from the output of the selection circuit 21d with the reference level.
21e, and the output of the comparator 21e is supplied to the control circuit 22.

The control circuit 22 includes a memory 22a that stores preset data of a plurality of glyco curves and a microcomputer (CP (CP) that operates based on a predetermined program).
U) 22b, etc., and the CPU 22b controls the FEQ3, 13 based on the data of the glyco curve read from the memory 22a in response to a specific key operation of the key matrix 23, and controls the graphic display based on the output of the comparator 21e. And display the spectrum analyzer on the display 24.

The display 24 is 60,125,250,500,1K, 2K, 4 as shown in FIG.
Nine bands of K, 8K, 16K [Hz] can be displayed, but the bands in which data is stored in the memory 22a are only the five bands of 60,250,1K, 4K, 16K shown by the solid line bar, Data for the four bands 125,500,2K, 8K indicated by the dotted line bar are not stored. Therefore, the FEQs 3 and 13 are configured to correspond to the above 5 bands, and the only bands whose level can be changed are those in which the data is stored in the memory 22a, and the levels of other bands are constant or change depending on the previous and next levels. It is supposed to do. However, since the display 24 can display 9 bands, the spectrum analyzer can be displayed in 9 bands as shown in FIG.

In the above configuration, the spectrum analyzer display is the key matrix.
When selected by the key operation of 23, the signal extracted from FEQ3, 13 is supplied to the filter and rectifier circuit 21c via the mixers 21a and ALC21b, where it is divided into each band,
Each is rectified. Filter and rectifier circuit 21c is FEQ
Since the signal is also divided into bands that do not exist in bands 3 and 13, spectrum analyzer can be displayed even for bands where the level is not variable.
That is, additional display for spectrum analyzer 9-glyco 5 = 4 bands can be performed in spectrum analyzer display.

On the other hand, when the graphic display is selected by the key operation of the key matrix 23, the CPU 22b in the control circuit 22 displays the graphic curves for 5 bands based on the data of the graphic curves read from the memory 22a. The remaining four bands are displayed by the processing of the CPU 22b.

There are k indicators 24 in the horizontal (X) axis direction and 1 in the vertical (Y) axis direction.
The X-axis represents a band and the Y-axis represents a level. The lighting segment is designated by the XY coordinates (x _k , y _L ) of the segment, and the data for this is stored by writing the logical "1" to the storage position M (x _k , y _L ) of the memory 22a. . In the example shown, memory 22
The a, 5 single band 60,250,1K, 4K, only the level of the 16K (Hz) is the storage location M [x _0, y _a), (x _2, y _b), (x _6,
By writing a logic "1" to y _d ], [x ₈ , y _e ], the glycococurve is stored, and the CPU 22b reads this data and turns on the segment of the corresponding coordinate. And 4
The level display for one band 125, 500, 2K, 8K [Hz] is performed by calculating the average of the levels before and after the band. For example, for the band 125 Hz, [x ₁ , (y _a +
y _b ) / 2] is calculated, and the segment corresponding to this coordinate is turned on. The dotted bar in FIG. 2 is lit and displayed in this manner.

Figure 4 is a flow chart showing the work performed by the CPU22b performed during glycoproteomics display described above, in step S1, the data from the memory _{22a (x 0, y a)} , (x 2, y b), (x
₆ , y _d ), x ₈ , y _e ) are read and the segment of the corresponding address on the display 24 is turned on. In the following step S2,
[X ₁ , (y _a + y _b ) / 2], [x ₃ , (y _b + y _c ) / 2], [x ₅ ,
(Y _c + y _d ) / 2], [x ₇ , (y _d + y _e ) / 2] are calculated, and the segment of the corresponding address on the display 24 is turned on.

From the above, even if the FEQ3, 13 and the memory 22a are for 5 bands, a glico curve that can be seen in 9 bands can be obtained.

In the above-described embodiment, the non-variable bands are arranged one by one between the variable bands, but it is not always necessary to do so, and the variable and non-variable bands are continuous. Also, the present invention can be equally applied.

Further, in the illustrated embodiment, in the graphic display, the band that cannot be changed based on the data of the preceding and following bands is also displayed, but such a display is not always necessary and a constant value is displayed. You may stay. Of course, by performing the display as in the embodiment, it is possible to perform the graphic display with the same sensation as the conventional one without any unnatural feeling, which is advantageous.

[Effect of device]

As described above, according to the present invention, it is possible to simplify the circuit configuration without spoiling the graphic display function by enabling the graphic display of the number of bands larger than the number of bands stored in the memory. Significant cost reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an electronic graphic equalizer device according to the present invention, FIG. 2 is a diagram showing a state of graphic display by the device of the present invention, and FIG. 3 is a state of spectrum analyzer display by the device of the present invention. FIG. 4 is a flow chart showing the work performed by the CPU in FIG. 1, and FIGS. 5 and 6 are views showing the graphic display and spectrum analyzer display of the conventional device, respectively. 22 ... control circuit, 22a ... RAM, 22b ... CPU, 23 ... indicator.

Claims (1)

[Scope of utility model registration request] 1. An electronic graphic equalizer device capable of selectively displaying a glycocurve and a spectrum analyzer level on the display according to the data stored in the memory means, wherein the number of bands of each graphic curve data stored in the memory means is a spectrum analyzer. Less than the number of display bands of the level, when displaying the glyco curve, display data of a band not stored in the storage unit is calculated based on data of a band adjacent to the band stored in the storage unit. An electronic graphic equalizer device, characterized by comprising display data forming means for forming by the data obtained in this way.