JPH01302906A - Graphic equalizer - Google Patents

Abstract

PURPOSE:To secure the luminance of a dark lighting part without damaging a dimmer effect by changing the rate of luminance control at the time of dimmer display in correspondence with various display patterns. CONSTITUTION:A control microcomputer 2 controls 2a the switching signal BCS of a BPF output Li, a segment driving signal Sj and the output timing of a digit driving signal Di, and controls 2c the equalizer levels of respective frequency bands of the audio signal with respect to an equalizer 4. A luminance control means 2b lights all display elements from a lowest level to a detection level in the same luminance at respective frequency bands in accordance with the display pattern selected in a key 5a, reduce the luminance from the detection level toward the lowest level, reduces the luminance of spectrum analyzer display displayed in a unit 3 when dimmer display is turned on, and changes the rate of luminance reduction in correspondence with various display patterns.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a graphic equalizer having a dimmer function, and particularly to a graphic equalizer that can switch brightness during dimmer display according to a display pattern.

<Prior Art> In recent years, graphic equalizers equipped with a display unit called a spectrum analyzer display have become mainstream.

This spectrum analyzer display displays the signal level of each frequency band in real time in the form of a band graph. Therefore, the listener can recognize the signal level of the low, high, or middle range just by looking at the spectrum analyzer display, and can easily determine whether each band has the desired level characteristics. I can do it.

Further, the spectrum analyzer display can vary the display brightness by using a dimmer function. For this reason, in bright environments such as during the day, the brightness is increased to improve visibility, and in dark environments such as nighttime, the brightness is lowered to reduce glare.

<Problem to be Solved by the Invention> However, when the spectrum display is performed using a display pattern consisting of a brightly lit part and a darkly lit part, when the brightness is reduced by turning on the dimmer display, the darkly lit part becomes too dark and the light is turned off. There were problems, such as the condition approaching that of the conventional one, which spoiled the enjoyment of the spectrum analyzer display.

In light of the above, an object of the present invention is to provide a graphic equalizer that can switch the brightness of the spectrum analyzer display when the dimmer display is on according to the display pattern to ensure the brightness of the darkly lit portion.

<Means for Solving the Problems> FIG. 1 is a block diagram of a graphic equalizer showing an embodiment of the present invention.

2 is a control microcomputer having brightness control means 2b;
3 is a display unit, 5 is an operation unit having a spectrum analyzer display pattern selection key 5a, and 8 is a dimmer terminal.

<Function> In the present invention, the brightness control means 2b is connected to the display unit 3.
The rate of brightness control when the dimmer display is turned on is varied according to various display patterns displayed on the screen.

<Embodiment> FIG. 1 is a block diagram of a graphic equalizer showing an embodiment of the present invention.

Reference numeral 1 indicates a level detection unit that detects the audio signal level in each frequency band; 2 indicates a control microcomputer having timing control means 2a, brightness control means 2b, equalizer control means 2c, etc.; and 3 indicates a display element array corresponding to each frequency band. 4 is an equalizer section for controlling the frequency characteristics of the audio signal AS; 5 is an equalizer section for controlling the frequency characteristics of the audio signal AS;
6 is an operation unit equipped with various keys such as a spectrum analyzer display pattern selection key (DISP) 5a, 6 is a DIGino 1-driver,
A segment driver 7 drives each display element of the display unit 3 to display spectrum analyzer/equalizer characteristics. Reference numeral 8 denotes a dimmer terminal, which turns on the dimmer display in conjunction with the lighting of the small lamp of the automobile, and automatically reduces the brightness of the spectrum analyzer display on the display unit 3.

When the frequency band of the audio signal AS is divided into i (l is an integer), the level detector 1 includes a filter section 1a having a band pass filter BPFi for each frequency band, and periodically outputs the output of the predetermined band pass filter BPFi. Frequency time division circuit 1b that selects Li and input signal level L
It has a level comparator 1c that compares the current level with a reference level to determine which step of j steps (j is an integer) the current level is in.

The control microcomputer 2 has a bandpass filter output L
The timing control means 2a for controlling the timing of outputting the switching signal BC8 and the segment drive signal SJ+digit drive signal Di, the brightness control means 2b, and the equalizer section 4 control the equalizer level of each frequency band of the audio signal AS. It has equalizer control means 20 and the like for controlling. The brightness control means 2b (i) lights up all the display elements from the lowest level to the detection level at the same brightness for each frequency band according to the display pattern selected by the spectrum analyzer display pattern selection key 5a. 1 display pattern), or (]i) all the display elements from the lowest level to the detection level are turned on, and the brightness of the corresponding display element is decreased from the detection level to the lowest level (in the second display pattern) (referred to as meteor display).

Furthermore, when the dimmer display is turned on, the brightness control means 2b reduces the brightness of the spectrum analyzer display displayed on the display unit 3 by 4-, and varies the rate of brightness reduction according to various display patterns. Incidentally, these brightness controls are executed, for example, by varying the pulse width of the digit active signal Di (see, for example, Japanese Patent Application No. 1987-8790).

The display unit 3 corresponds to the spectrum analyzer display 51 shown in FIG.

FIG. 2 is an explanatory view of the appearance of the graphic equalizer, and is provided with a spectrum analyzer display 51 that displays signal levels of 11 frequency bands. Spectrum analyzer display 5
1 is 31.5Hz to the right.

A frequency axis X having a frequency scale of 60 groups, 125 Hz, . . . , 16 kHz is assigned a signal level axis y from MIN to MAX in the upward direction. Note that each frequency indicates the center frequency of the band. A plurality of (for example, 13) display elements 52 for each frequency band are arranged in a row in the signal level axis direction to form a display element row 53-1.53.
-2. ..., 53-i are formed. However, 1 is an integer. According to this spectrum analyzer display 51, when the signal level is low for each frequency band, the lower display element 52 lights up, and as the signal level increases, the upper display elements also light up. Note that the brightness of each display element 52 is determined by the selected display pattern and dimmer display on/off.

Next, the present invention will be explained in detail with reference to the display patterns shown in FIGS. 3(a) and 3(b). Note that in these figures, a display unit with seven frequency bands will be used for explanation.

FIG. 3(a) shows a first display pattern G1 in which the display elements 52 are all brightly lit (100% lit) when the timer display is off. This first display pattern G1
is controlled and displayed at, for example, 50% lighting intensity by turning on the dimmer display.

FIG. 3(b) shows the display element 52 at the tip of the spectrum analyzer display.
A second display pattern G2 is shown in which only 1 is brightly lit, and at lower levels, the above-mentioned meteor display is darkly lit.

By turning on the dimmer display, this second display pattern G2 lowers the brightness by, for example, 10%, the brightly lit portion is lit at 90%, the level below that is lit at 85%, 80% lit, 7
5% lit.

The brightness is decreased sequentially as follows.

Furthermore, in the case of a display pattern in which the darkly lit portion in FIG. 3(b) is set to, for example, 50% lighting when the dimmer display is off, the present invention sets the brightly lit portion to 80% lighting when the dimmer display is on. The brightness control means 2b functions to display the darkly lit portion with 40% lighting.

As described above, in the present invention, the ratio (%) of the lighting brightness during dimmer display is variable depending on the first display pattern G1 having a -temperature lighting brightness or the second display pattern G2 having a difference in brightness. Therefore, the dimmer effect, which allows the display brightness to be set to a value that is easy to see according to the brightness of the environment, is not impaired.

Note that the lighting brightness (%) for dimmer display is not limited to the value shown in the above example, and may be set to other values taking into consideration visibility and differentiation of bright and dark areas. .

Further, the timer display may be turned on/off by providing a dimmer key on the operation unit 5, without depending on the small lamp being turned on/off.

<Effects of the Invention> According to the present invention, the brightness control means for varying the brightness control ratio during dimmer display according to various display patterns is provided, so that the dimmer effect is not impaired and the dimmer display is improved. The brightness of the darkly lit parts can be maintained by switching the brightness of the display according to the display pattern.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a graphic equalizer showing an embodiment of the present invention, and FIG. 2 is an external explanatory diagram showing the graphic equalizer. FIGS. 3(a) and 3(b) are display pattern diagrams for explaining the present invention in detail. 2...Control microcomputer, 2b...Brightness control means, 3...Display unit, 5...Operation unit, 5a...Spectrum analyzer display pattern selection key, 8...Daimer terminal. Patent Applicant: Alpine Co., Ltd. Agent, Patent Attorney Chiki Saito Figure 3 (a) (b) Open-open lighting section "Dark lighting exit off" - 8 Incident display Patent Application No. 133242, 1988 2, Title of the invention Graphic Equalizer 3, Relationship with the Amended Person Case Patent Applicant Address: 1-1-8 Nishigotanda, Parts Ward, Tokyo Name: Alpine Co., Ltd. Representative: Kutsuzawa Sotabu 4, Agent Address: 101 Tokyo, Japan 2-5-14-6 Kajicho, Chiyoda-ku, Drawing 7 subject to amendment, Contents of amendment

Claims (1)

[Scope of Claims] In a graphic equalizer that controls the brightness of a display pattern displayed on a display unit according to on/off of dimmer display, a brightness control means that varies the brightness control ratio during dimmer display according to various display patterns. A graphic equalizer characterized by being equipped with.