JPH043508A - Graphic equalizer - Google Patents

Abstract

PURPOSE:To obtain a GE curve with an optimum sound quality characteristic automatically by analyzing an average spectrum of a music signal, selecting a GE curve characteristic pattern from plural relevant patterns stored in advance, controlling a GE circuit so as to obtain the relevant pattern and displaying the result. CONSTITUTION:The equalizer is provided with an analysis means 1 analyzing a mean spectrum of a music signal within a prescribed time, a classification means 2 classifying the result of analysis of the mean spectrum into plural characteristic patterns and a selection means 3 retrieving the classified characteristic pattern and selecting the pattern from plural relevant patterns stored in advance in its internal memory. Then a GE curve of a selected relevant pattern is fed to a GE circuit 11 and a GE curve adjustment element of the GE circuit 11 is controlled to set to the relevant pattern. Simultaneously, a GE curve data of the relevant pattern is fed to a GE curve display section 13 and the GE curve is displayed on the display section 13. Thus, the GE curve with optimum sound quality is obtained.

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a graphic equalizer for audio equipment,
In particular, the present invention relates to a graphic equalizer suitable for automatically setting an optimal graphic equalizer curve (hereinafter simply referred to as GE curve) tailored to a music signal.

(B) Prior Art Many graphic equalizers used in conventional audio equipment have block diagrams shown in FIGS. 4 and 5.

In the figure, 10 is the input terminal of the graphic equalizer, 11 is a graphic equalizer circuit (hereinafter referred to as GE circuit) that can analyze the spectrum of multiple channels and set the signal level of each channel, and 13 is the input terminal from GE circuit 11. Display section for displaying GE curve, 15
is a fixed memory storing a plurality of predetermined GE curves; 16 is an operation key for controlling the fixed memory 15;

Generally, when setting the GE curve for audio equipment, the user must set the GE circuit 1 to obtain the optimum sound quality while listening to music.
The user adjusted the GE curve setting regulator (not shown) for multiple channels provided in the GE curve display section 13, and set the GE curve while looking at the GE left curve displayed on the GE curve display section 13.

Further, as shown in FIG. 5, a plurality of GE curve characteristics are stored in advance in the fixed memory 15, and one GE left curve is selected by operating the operation key 16 that controls the fixed memory 15.
This GE left curve was used to listen to the played music signal and select and set the GE left curve to achieve the optimum sound quality.

(c) Problems to be solved by the invention However, in order to set the GE left curve for optimal sound quality, the conventional graphic equalizer described above is
I listened to left curve music, then set another GE left curve, listened to the music again, compared the sounds, and set the GE left curve for the best sound quality.

It should be noted that the comparison of the set GE curves may be repeated multiple times as necessary, which has the disadvantage that it takes time to set the optimum sound quality for this GE left curve, and the setting work is troublesome.

This invention has been made in view of the above points, and its purpose is to eliminate the drawbacks of the conventional example, recognize the characteristic pattern of a music signal, and create a corresponding pattern of optimal sound quality that matches this music signal. The objective is to provide a graphic equalizer that automatically selects and controls the GE circuit.

(d) Means for solving problems FIG. 1 is a functional block diagram showing the configuration of this invention.
The graphic equalizer of the present invention analyzes the spectrum of a music signal and displays the spectrum of a plurality of channels, and includes an analysis means for analyzing the average spectrum of the music signal within a certain time;
A classification means for classifying this average spectrum analysis result into a plurality of characteristic patterns, and a selection means for searching and selecting the classified characteristic pattern with a plurality of corresponding patterns stored in advance in an internal memory are provided. It is configured to control the graphic equalizer circuit to set a graphic equalizer curve of a corresponding pattern, and to display the graphic equalizer curve on the graphic equalizer display section at the same time.

(e) Operation The operation of this invention will be explained using the functional block diagram of FIG.

The spectrum of a music signal is taken in, the spectrum is sampled at fixed time intervals within a fixed time, and the average spectrum value within this fixed time is calculated (average spectrum analysis means 1).

The frequency characteristics of this average spectrum analysis result are detected and classified according to this frequency characteristic pattern (classification means 2).

This classified characteristic pattern is searched with a plurality of corresponding patterns previously stored in an internal memory, and a corresponding pattern is automatically selected (selection means 3).

The selected corresponding pattern is supplied to the GE left curve GE circuit, and the GE curve adjustment element of the GE circuit is controlled to be set to the corresponding pattern (GE curve setting means 4).

At the same time, the corresponding pattern G is displayed on the GE display section.
The E curve data is supplied and the GE left curve is displayed on the display section (GE deer display means 5).

In this way, the average spectrum of the music signal is calculated and the G
Set the E left curve and select the G for the optimal sound quality for this music signal.
E. A left-hand curve can be obtained, and the operation is easy.

(f) Embodiment The first embodiment of the graphic equalizer according to the present invention is described below.
This will be explained based on FIGS. 3 to 3.

Note that the same parts as in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a hardware block diagram, and FIG. 3 is a flowchart explaining the operation.

In the figure, 12 indicates the GE curve display section 13 and the GE circuit 1.
A microcomputer (hereinafter simply referred to as a microcomputer) controls the microcomputer 1 and the like; 14 is an operation key for operating the microcomputer 12;

The music signal supplied to the input terminal 10 is subjected to spectrum analysis by the GE circuit 11, a GE left curve is set, and the signal is output. The music signals of multiple channels subjected to spectrum analysis by the GE circuit II are supplied to the microcomputer 12, and the microcomputer 12 detects and analyzes the frequency spectrum of the music signals.

The operation of this microcomputer 12 will be explained with reference to the flowchart shown in FIG.

When the GE curve setting key of the operation key 14 connected to the microcomputer 12 is operated (step Sl), the microcomputer 12
takes in the spectrum of the music signal subjected to spectrum analysis by the GE circuit II (step S2), and calculates the average spectrum of the spectrum of this music signal.

In this average spectrum analysis, a certain section of a representative portion of the music signal is sampled and captured at certain time intervals, and the average value of the spectrum of the certain section of the music signal is calculated (step S3).

This average spectrum analysis result is classified (step S
4). For example, the frequencies f1 to f4 between each two points of the low frequency band and the high frequency band are set, and the low frequency characteristic L1. L2. L3...Ln and high frequency characteristics are divided into n and m classifications of old, H2, H3...Hm, and the low frequency n classification and high frequency m classification are combined to form nX.
It can be classified into m patterns.

For example, as shown below, both the low and high frequencies are classified into 3 categories, the low frequency fl = 90) 1z, f2 = 40[1llz, and the high frequency f3 1kHz, f4 = IokHz,
The signal level characteristics of this frequency band are shown by arrows.

As described above, the average spectrum of the music signal is set to one pattern out of approximately nine patterns.

On the other hand, a plurality of corresponding patterns of GE left-curve characteristics are stored in advance in the microcomputer J2. This dried GE
The left-curved correspondence pattern is a correspondence pattern that has characteristics determined to provide optimal sound quality, including the speakers of the music reproduction system, when music is experimentally reproduced.

For example, if the GE curve compatible patterns that produce the optimal sound quality for music signal playback are characteristics A, B, C,...
It is searched whether the characteristic pattern classified by the average spectrum analysis of the music signal matches or approximately matches the A characteristic among the plurality of corresponding patterns stored in the microcomputer 12 (step S5).

If it matches or approximately matches the A characteristic in step S5, read this A characteristic from the memory (step S8);
This A characteristic is set as a GE curve by controlling the GE circuit 11 (step S+Z).

If it does not match the A characteristic in step S5, the next B characteristic is searched (step S6), and if it matches as described above, step S9). Execute S13 to set the GE curve. If the characteristic does not match the B characteristic, step S7 is executed to search for the C characteristic.

In this way, the microcomputer 12 stores a plurality of corresponding patterns A and B in which the average spectrum of the music signal is stored.

C, . . . The characteristics are sequentially searched and the closest corresponding pattern is selected.

Although the flowchart in FIG. 3 shows the search for three A, B, and C characteristics, in reality, many corresponding patterns are prepared, and many of these corresponding patterns are searched.

The microcomputer 12 selects the corresponding pattern searched in this way, and controls the G
The GE curve can be set by controlling the E circuit 11.

In addition, the microcomputer 12 selects the GE of the selected and determined corresponding pattern.
The curve data is supplied to the display section 13, and the GE data is displayed on the display section 13.
Show curves.

(G) Effects of the Invention As described above, the graphic equalizer according to the present invention analyzes the average spectrum of a music signal, and selects a GE curve characteristic pattern corresponding to this average spectrum from a plurality of corresponding patterns stored in advance in the microcomputer. Then, the GE circuit is controlled to match this corresponding pattern, and the GE curve of this corresponding pattern is displayed on the GE display section, so the GE curve with the optimal sound quality characteristics that most closely matches the music signal is automatically selected. There is an effect that can be obtained.

Unfortunately, this GE curve setting and display function relies heavily on the microcomputer software built into the graphic equalizer, which has the effect of increasing functionality without increasing costs and is easy to implement. It has excellent features such as:

[Brief explanation of the drawing]

1 to 3 show an embodiment of the graphic equalizer according to this invention, in which FIG. 1 is a functional block diagram, FIG. 2 is a hardware block diagram, and FIG. 3 is a flow chart explaining the operation. 4 and 5 show conventional examples, FIG. 4 is a block diagram, and FIG. 5 is a block diagram of another conventional example. Explanation of main symbols 10 Input terminal of Nigella Hitsuki equalizer, 11 Nigella Hitsuku equalizer circuit (GE circuit), 12: Microcomputer (microcomputer), +3: GE curve display section, 14: Microcomputer operation key Patent applicant Kenwood Co., Ltd. Daiichi Regret

Claims (1)

[Claims] A graphic equalizer that performs spectrum analysis of a music signal and displays the spectrum of a plurality of channels, comprising: an analysis means for analyzing an average spectrum of the music signal within a certain period of time; A classification means for classifying into patterns, and a selection means for searching and selecting the classified characteristic pattern with a plurality of corresponding patterns stored in advance in an internal memory are provided, and a graphic equalizer curve of the selected corresponding pattern is selected. What is claimed is: 1. A graphic equalizer characterized in that the graphic equalizer is configured to control settings in a circuit and simultaneously display a graphic equalizer curve on a graphic equalizer display section.