JPH03201711A - Graphic equalizer - Google Patents

Abstract

PURPOSE:To facilitate the setting of an equalizer level by driving one display section in response to an equalizer setting signal at the setting side channel setting an equalizer level, and the other display section in response to a spectrum analyzer signal of the setting side channel respectively simultaneously. CONSTITUTION:One display section 18 in response to a channel for setting an equalizer is used for equalizer setting display and an idle other display section 19 is used for spectrum analyzer display in response to the channel at the time of setting equalizer level by taking notice of it that most of graphic equalizers are provided with 2 system of destinations to attain independent spectrum analyzer display in response to left and right channel stereo signals. Thus, the equalizer level is set by referencing the spectrum analyzer display. Thus, while the level change in the spectrum analyzer display in response to the setting of the equalizer level is observed, the equalizer level is easily set.

Description

Detailed Description of the Invention (A) Industrial Application Field The present invention is a method for independently displaying the signal level of each divided frequency band according to each of the left and right channel signals of a stereo signal. The present invention relates to a graphic equalizer device having two systems of display sections.

(B) Prior Art A graphic equalizer device is known that divides an audio frequency band into a plurality of parts and can enhance or attenuate the signal level for each frequency band. The graphic equalizer device is usually provided with a spectrum analyzer display that displays the distribution of frequency components of the input signal by arranging and displaying the signal levels of each frequency band in a bar graph. A graphic equalizer device equipped with such a spectrum analyzer display has two systems of display parts, as shown in, for example, Japanese Utility Model Application Publication No. 63-81520, and these display parts can be used to display the left and right sides of a stereo signal. Many of them are designed so that they can be driven independently according to each channel signal.

On the other hand, as a graph equalizer device equipped with a spectrum analyzer display, for example,
As shown in Publication No. 244110, the equalizer setting display showing the increase/decrease in the signal level set for each frequency band and the spectrum analyzer display showing the distribution of frequency components of the input signal can be displayed on the same screen by switching a switch. There are devices that can be used to display parts selectively.

By the way, the graphic equalizer device disclosed in the above-mentioned Japanese Utility Model Publication No. 63-81520 has a plurality of slides in which equalizer level settings for setting the increase/decrease of the signal level for each frequency band are arranged side by side for each frequency band. This is done by sliding the volume according to the increase/decrease for each frequency band, and the spectrum analyzer display is superimposed on an operation panel provided with a heir for operating the sliders of the plurality of slide volumes. Therefore, the equalizer level can be easily set by observing the level change of the spectrum analyzer display displayed on the spectrum analyzer display.

(c) Problems to be Solved by the Invention However, most of the current graphic equalizer devices do not use a slide volume but use an electronic volume, so-called electronic graphic equalizer devices, and also have a spectrum analyzer display. Due to the large area it occupies and the area of the operation panel, it is not possible to adjust the slide volume according to the increase or decrease for each frequency band.For example, when setting the equalizer level, Push-button switches were used to amplify and attenuate the signal level for each frequency band.Electronic graphic equalizer devices display equalizer settings on the spectrum analyzer display. Since the level is set, it is not possible to observe the spectrum analyzer display when setting the equalizer level.Therefore, in such electronic graphic equalizer devices, the equalizer level must be set based only on the sense of hearing. First, there was a problem in that it was difficult to set the equalizer level.

(d) Means for Solving the Problems The present invention has been made in view of the above points, and includes an equalizer level setting means for setting an increase/decrease in signal level for each divided frequency band, and an equalizer level setting means for setting an increase/decrease in signal level for each divided frequency band. a signal generating means for generating an equalizer setting signal according to an increase or decrease in the setting level by the setting means; and a spectrum analyzer means for analyzing the signal level for each frequency band and generating a spectrum analyzer signal indicating the frequency components of the input signal. , comprising display section driving means for independently driving two systems of display sections, and signal selection means for selectively supplying the equalizer setting signal and the spectrum analyzer signal to the display section driving means, and an equalizer. One display section can be simultaneously driven in response to an equalizer setting signal of a setting channel for setting the level, and the other display section can be driven simultaneously in accordance with a spectrum analyzer signal of the setting channel.

(E) Effect The present invention focuses on the fact that most graphic equalizer devices are equipped with two display sections so that spectrum analyzers can be displayed independently according to the left and right channels of a stereo signal, and when setting the equalizer level, , so that one display section corresponding to the channel on which equalizer settings are to be made can be used to display the equalizer settings, and the other empty display section can be used as the spectrum analyzer display according to the channel, and the ifalizer level can be set using the spectrum analyzer display as a guide. settings can be made.

(Go) Embodiment FIG. 1 is a circuit block diagram showing an embodiment of the present invention.
1) is the Lch input terminal into which the left channel (hereinafter abbreviated as Lch) signal of the stereo signal is input, (2> is the Lch input terminal)
A graphical equalizer circuit for Lch that divides the Lch signal input to the h input terminal (1) into multiple frequency bands and amplifies and attenuates the signal level for each frequency band. Abbreviated as G and E circuits for ch. ), (3> is the Lch
The Lch output selection circuit 4> selectively outputs the Lch signal input as it is to the input terminal (1) and the Lch signal obtained via the G and E circuits <2). 3) is the Lch power amplifier that amplifies the Lch signal selected by the above, and <5> is the power amplifier (4).
(6) is the Rch input terminal into which the right channel (hereinafter abbreviated as Rch) signal of the stereo signal is input, (7) is the Rch input terminal (6) driven by the Lch speaker.
〉Graphic equalizer circuit for Rch for dividing the Rch signal input into multiple frequency bands and enhancing and attenuating the signal level for each frequency band.
, abbreviated as E circuit), (8> is the Rch input terminal (6)
The Rch signal as it is input to the G and E circuits (
The Rch output selection circuit 9> which selectively outputs the Rch signal obtained via the output selection circuit (8)
an Rch power amplifier that amplifies the Rch signal selected by (10), an Rch speaker driven by the 4i power amplifier (9), and (11) a key human power means (
Equalizer level setting means (1) for setting the increase/decrease of the signal level of the above and Rch G, E circuits (2> and (7)) for each frequency band divided according to the operation of (12);
3), and a signal generating means (14) that generates an equalizer setting signal according to the increase/decrease of the setting level by the equalizer level setting means (13>), and a The microcomputers (15) and (16) that perform various controls are L and R channel spectrum analyzer 941 circuits 17 that analyze the signal level of each frequency band and generate analyzer signals indicating the frequency components of the input signal. ) is controlled by the microcomputer (11), and selectively outputs the L and Rch signals output from the L and Rch output selection circuits) and (8), and the Rch spectrum analyzer 941 circuit 5. ) and (16), and (18) and (19) each consist of a fluorescent display (FL) display that displays the signal level for each frequency band in a bar graph. L and Rch front non-display parts 20> and (21) are the F and L drive circuits for L and Rch that drive the above and Rch front non-display parts 8> and (19), respectively, and <22> is the micro The computer (11) controls the equalizer setting signal generated from the signal generating means (14) and the Lch spectrum analyzer circuit (1).
5> selectively transmits the analyzer signal generated from the Lc
The Lch table non-display signal selection circuit 23 for supplying to the H F and L drive circuits (20) is controlled by the microcomputer (11), and is also controlled by the equalizer generated from the signal generating means (14). Setting signal and the R
This is an Rch display signal selection circuit for selectively supplying the analyzer signal generated from the ch spectrum analyzer 941 circuit 6> to the Rch F, L drive circuit (21).

In the graphic riser device having such a configuration, L
The Lch signal of the stereo signal is input to the channel input terminal (1), and the Lch signal is sent directly or via the Lch G and E circuit (2) to the Lch output selection circuit.
is supplied to Therefore, by switching the selection state of the Lch output selection circuit) by operating the key manual means (12), the selection state of the Lch output selection circuit) can be changed directly from the Lch output selection circuit) or from the Lch J'flG, E circuit (2). L via
Any channel signal can be obtained. The Lch signal obtained from the Lch output selection circuit is input to the Lch power amplifier (4), and the Lch speaker (5) is driven by the Lch power amplifier (4) according to the Lch signal. Ru.

On the other hand, the Rch input terminal (6) is connected to the Rch input terminal (6) of the stereo signal.
h signal is input, and the Rch signal is supplied to the Rch output selection circuit directly or via the Rch G and E circuits (7). Therefore, by switching the selection state of the Rch output selection circuit (8) by operating the key manual means (12), it is possible to directly connect the Rch output selection circuit (8) or the Rch G, E circuit (7). The Rch signal obtained from the Rch output selection circuit is input to the Rch power amplifier (9), and the Rch speaker (10) is input to the Rch power amplifier (9).
) is driven by the Rch power amplifier (9) according to the Rch signal.

In addition, the L and Rch signals obtained from the L and Rch output selection circuit) and (8), respectively, are output from the switching circuit <1
7>, and is selectively switched to L by the switching circuit (17).
and Rch spectrum analyzer circuits 15) and (16>).The L and Rch analyzer signals obtained from the above and Rch spectrum analyzer circuits 5) and (16>) are respectively Display signal selection circuit for L and Rch (22> and (
23>. In addition, the above and Rch display signal selection circuits (22> and (23)) include a signal generation means (
14> and is generated from the if riser level setting means (13
) is supplied with an equalizer setting signal according to the increase/decrease of the setting level. Here, the signal generating means (14) generates an equalizer setting signal corresponding to the setting position of the equalizer level performed for each channel or to the Rch display signal selection circuit (22) or (23). Therefore, the Lch display signal selection circuit (22>) selectively outputs the Lch analyzer signal and the Lch equalizer setting signal, and the Lch F, L drive circuit (20>) outputs the Lch display signal selection circuit (22>). L depending on the signal selected by the display signal selection circuit <22)
Display for channel g! ! (1g) is driven, and from the Rch display signal selection circuit (23>), the Rch
The analyzer signal for Rch and the equalizer setting signal for Rch are selectively output, and the F and L drive circuit for RCh (21)
Accordingly, the Rch display section (19) is driven in accordance with the signal selected by the Rch display signal selection circuit (23>).

By the way, when the power is turned on, the microcomputer (11) sets the L channel so that the L and R channel equalizer setting signals are automatically supplied to the L and R channel F, L drive circuits (20) and (21), respectively. and Rch display signal selection circuits (22> and (23)), and uses a timer means (not shown) included in the microcomputer (11) for a predetermined period of time (
For example, when 5 seconds have elapsed, the L and Rch analyzer signals are automatically set to L and RchJllF, respectively.

The L and Rch display signal selection circuits (22) and (23) are controlled so that the L and Rch display signals are supplied to the L drive circuits (20> and (21)).
19> are L and Rch, respectively, when the power is turned on.
In other words, an equalizer setting display showing the increase/decrease of the signal level for each divided frequency band is displayed, and after a predetermined period of time has elapsed after the power is turned on, the equalizer setting signal is displayed according to the L and R channel analyzer signals. In other words, a spectrum analyzer display showing the distribution of frequency components of the input signal input to the L and R channel spectrum analyzer circuits 5> and <16>, respectively, is performed.

In addition, the microcomputer (11) determines the selection state of the L and Rch output selection circuit (output selection circuit for L and Rch) and (8), the selection state of the switching circuit (17), and the selection state of the L and Rch output selection circuit (output selection circuit for L and Rch) and Display signal selection circuit (22> and (2)
A control signal is generated to switch between the selection state and the selection state of 3). That is, when an operation for setting the equalizer level of L or Rch G, E circuit (2> or function (7)) is performed by key manual means (12>), the above and Rch output selection circuit) and (8) are L and R obtained through G and E circuits (2) and (7> for L and Rah, respectively).
The switching circuit (
17> is switched so that the signal obtained from the output selection circuit of the setting side channel which is setting the equalizer level is supplied to the spectrum analyzer circuit of the non-setting side channel different from the setting side channel. At the same time, the above and Rch display signal selection circuit (22)
and (23), the display signal selection circuit of the setting side channel selects the equalizer setting signal generated from the signal generating means (14), and the display signal selection circuit of the non-setting side channel selects the equalizer setting signal of the non-setting side channel. It can be switched to select the analyzer signal obtained from the circuit. Therefore, when the key manual means (12) is used to set the equalizer level of the G, 2 circuit (2> or (7)) for L or Rch, the display section of the setting side channel will display the second As shown in Figure (A), the equalizer setting display is performed to show the setting position of the equalizer level, and the display section of the non-setting side channel is displayed for each frequency band according to the operation, as shown in Figure 2 (Figure 2). Spectrum analyzer display of the setting side channel where the signal level is enhanced or attenuated is performed.
It is possible to observe the level change on the spectrum analyzer display according to the equalizer level setting, and the equalizer level can be set using the spectrum analyzer display as a guide.

For example, the equalizer levels of the G circuits (2) and (7) for L and R channels are adjusted based on the fact that the key manual means (12) is not operated for a preset predetermined period of time (several seconds). When determining that the settings are complete, the microcomputer (11) switches the Rch signal so that the switching circuit (17) supplies the Lch signal obtained from the Lch output selection circuit to the Lch spectrum analyzer circuit (15). Rc obtained from the output output selection circuit
Spectrum analyzer circuit for Rch h signal (16)
At the same time, the switching circuit (17) is switched and controlled so that the L and R channel display signal selection circuits (22) and (23) supply the L and R channel display signal through the L and R channel spectrum analyzer circuits (2> and (7), respectively). L and Rch
The above-mentioned and R
The channel display signal selection circuits (22> and (23)) are switched and controlled. Therefore, the G for L and R channels.

After the setting of the equalizer levels of the two circuits (2) and (7) is completed, the L and R channel display sections (18> and <19>) display a spectrum analyzer display according to each channel.

Incidentally, in the above embodiment, G for L or Rch, 2
When the equalizer level setting operation in circuit (2) or (7) is performed, the display section of the setting side channel is automatically changed to the equalizer setting display, and the display section of the non-setting side channel is automatically set to the spectrum analyzer display. However, without being limited to this, for example, key human power means (12
> is provided with a key for switching the display, and each time the key is operated, various combinations of equalizer setting display and spectrum analyzer display are displayed in order on the L and R channel display sections (18> and (19)). It does not depart from the gist of the present invention even if the equalizer settings are displayed on the display section of the non-setting channel and the spectrum analyzer display is displayed on the display section of the setting channel.

(G) Effects of the Invention As described above, according to the present invention, one of the display sections is set according to the equalizer setting signal of the setting side channel for setting the equalizer level, and the other display section is set according to the spectrum analyzer signal of the setting side channel. Since one display section can drive the other display section at the same time, it has the advantage that the equalizer level can be easily set while observing the level change on the spectrum analyzer display according to the equalizer level setting.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG.
Figures (a) and (b) are explanatory diagrams showing examples of equalizer setting display and spectrum analyzer display on the display section, respectively. Explanation of main figure numbers (2) (7)...Graphic equalizer circuit, (
11)...Microcomputer, (13)...Equalizer level setting means, (14>...Signal generation means, (15)(16>...Spectrum analyzer circuit, (17)...Switching circuit , (1B) (19)
. . . Display section, (22) (23) . . . Display signal selection circuit.

Claims (1)

[Claims] (1) The signal level can be increased or decreased independently for each divided frequency band, and the signal level for each frequency band can be displayed independently according to the left and right channel signals of the stereo signal. In a graphic equalizer device having two display sections, an equalizer level setting means for setting an increase/decrease in a signal level for each frequency band, and an equalizer setting signal generated in accordance with the increase/decrease in a set level by the equalizer level setting means. a spectrum analyzer means for analyzing the signal level for each frequency band and generating a spectrum analyzer signal indicating the frequency components of the input signal;
An equalizer comprising: display drive means for independently driving the two systems of display units, and signal selection means for selectively supplying the equalizer setting signal and the spectrum analyzer signal to the display drive means. This graphic equalizer device is capable of simultaneously driving one display section according to an equalizer setting signal of a setting side channel for setting a level, and the other display section according to a spectrum analyzer signal of the setting side channel.