JPH0680996B2 - Graphic equalizer - Google Patents

Graphic equalizer

Info

Publication number
JPH0680996B2
JPH0680996B2 JP63133241A JP13324188A JPH0680996B2 JP H0680996 B2 JPH0680996 B2 JP H0680996B2 JP 63133241 A JP63133241 A JP 63133241A JP 13324188 A JP13324188 A JP 13324188A JP H0680996 B2 JPH0680996 B2 JP H0680996B2
Authority
JP
Japan
Prior art keywords
display
display pattern
signal level
level
frequency band
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP63133241A
Other languages
Japanese (ja)
Other versions
JPH01302905A (en
Inventor
宏祐 熊耳
Original Assignee
アルパイン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by アルパイン株式会社 filed Critical アルパイン株式会社
Priority to JP63133241A priority Critical patent/JPH0680996B2/en
Publication of JPH01302905A publication Critical patent/JPH01302905A/en
Publication of JPH0680996B2 publication Critical patent/JPH0680996B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic equalizer having a plurality of display patterns, and more particularly to a graphic equalizer capable of selecting and displaying an optimum display pattern according to a signal level of an audio signal. .

<Prior Art> An audio device is equipped with a spectrum analyzer display (spectrum display) to directly display the signal level in each frequency band, and the signal level in each frequency band is displayed in real time as a band graph. It is supposed to be displayed in a shape. Therefore, the listener can recognize the signal level in the low frequency band, the high frequency band, or the middle frequency band by just looking at the spectrum analyzer display, and easily determine whether or not each band has a desired level characteristic. You can FIG. 2 is an external view showing a conventional graphic equalizer, and a spectrum analyzer 51 for displaying the signal level in the 11-band frequency band is provided. Turn the spectrum indicator 51 to the right.
A frequency axis x having a frequency scale of 31.5 Hz, 60 Hz, 125 Hz, ..., 16 kHz is assigned to a signal level axis y from MIN to MAX in the upward direction. Each frequency indicates the center frequency of the band. Then, a plurality (for example,
Display elements rows 53-1, 53-2, ..., 53-i are formed by arranging 13 display elements 52 in a row in the signal level axis direction. However, i is an integer.

According to the spectrum analyzer 51, the lower display element 52 lights up when the signal level is low in each frequency band, and the upper display element lights up as the signal level increases.

<Problems to be Solved by the Invention> In such a conventional graphic equalizer, when the signal level is low, the portion where the display element 52 lights up is scarce, and the entire display area cannot be effectively used, resulting in a visually uninteresting display. was there.

From the above, an object of the present invention is to provide a graphic equalizer capable of automatically selecting the optimum display pattern for the signal level and performing visually pleasing spectrum analyzer display.

<Means for Solving the Problems> According to the present invention, the above-mentioned problems include an audio signal level detection unit that detects an average value of audio signal levels in all frequency bands, and a frequency band corresponding to an average level of audio signals. This is achieved by a graphic equalizer having display pattern selection means for selecting a display pattern for displaying a signal level and a display unit for displaying an audio signal level of each frequency band based on the selected display pattern.

<Operation> An average value of audio signal levels in all frequency bands is detected, a display pattern for displaying the signal level in the frequency band is selected according to the average level of the audio signals, and each frequency is selected based on the selected display pattern. Displays the audio signal level of the band.

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

Reference numeral 1 is a level detecting section for detecting an audio signal level in each frequency band, 2 is a control microcomputer, 3 is a display unit in which a display element array is arranged corresponding to each frequency band (corresponding to the spectrum analyzer display 51 in FIG. 2). 4) is an equalizer section for controlling the frequency characteristic of the audio signal AS, 5 is an operation section having various keys, 6 is a digit driver, 7 is a segment driver, and each display element of the display unit 3 is It drives and displays spectrum analyzer / equalizer characteristics according to the display pattern selected by the display pattern selection means 2b.

The level detector 1 determines the frequency band of the audio signal AS by i
(I is an integer) When divided, a filter unit 1a having a bandpass filter BPFi for each frequency band, and a frequency time division circuit 1b for periodically selecting an output Li of a predetermined bandpass filter BPFi are input. It has a level comparator 1c which compares the signal level L with a reference level to judge which step of j steps (j is an integer).

The control microcomputer 2 outputs the bandpass filter output Li
Timing control means 2a for controlling the timing of outputting the switching signal BCS, segment drive signal Sj, digit drive signal Di, display pattern selection means 2b, and brightness control means
2c, and equalizer control means 2d for controlling the equalizer level of each frequency band of the audio signal AS by the equalizer unit 4 and the like. The display pattern selection means 2b selects a display pattern according to the signal level L of the audio signal AS, and causes the display unit 3 to perform the spectrum display which effectively uses the display screen. As the display pattern, a display pattern G 1 in which the lower display element 52 is lit when the signal level is low for each frequency band and the upper display element is lit as the signal level increases
(Refer to display pattern G 1 in FIG. 3 (a)), as shown in FIG. 3 (b), the MAX level is set in the central part of the spectrum analyzer 51, and the display pattern G displaying the signal level from above and below
2 (Change the brightness of the overlapping part), Fig. 3 (c)
Display pattern that sets the MIN level in the center of the spectrum analyzer 51 and displays the signal level up and down as shown in
There is G 3 and so on.

Further, the brightness control means 2c determines the display element 52 to be lit and displayed based on the display pattern and the signal level, and based on the timing signal, the digit drive signal Di and the segment signal Sj.
Is output.

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

The operation of FIG. 1 will be described below with reference to FIGS.

First, the control microcomputer 2 calculates an average value of the signal level L in all frequency bands, and this average value is, for example, half or more of the maximum display level (+12 dB in FIG. 2) (0 dB in FIG. 2) or more. The display pattern is selected depending on whether it is 1/2 or less, 1/3 (-8 dB in Fig. 2) or more and 1/3 or less. That is, the display pattern selection means 2b selects the display pattern G 1 when the average value is 1/2 or more, and selects the display pattern G 2 when the average value is 1/2 or less, Level L
If the average value of is less than 1/3 of the maximum display level, the display pattern G 3 is selected, and this is displayed on the display unit 3.

By automatically selecting the display pattern as described above, a pleasant display can be expected due to the unexpectedness and versatility associated with the switching of the display pattern.

Although the 11-band graphic equalizer has been described as an example in the above embodiment, the present invention may be applied to other 5-band or 9-band graphic equalizers.

<Effects of the Invention> As described above, according to the present invention, since the display pattern selection means for selecting the display pattern according to the signal level of the audio signal is provided, it is possible to automatically select the optimum display pattern for the signal level. , A visually pleasing spectrum analyzer display can be performed.

Further, by switching the display patterns, it is possible to make the disadvantages of the individual display patterns inconspicuous and take advantage of the advantages.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a graphic equalizer showing an embodiment of the present invention, FIG. 2 is an external view showing a conventional graphic equalizer, and FIGS. 3 (a) to 3 (c). Is a display pattern diagram. 1 ... Level detector, 2 ... Control microcomputer, 2a ... Display pattern selection means, 3 ... Display unit, AS ... Audio signal, L ... Signal level.

Claims (1)

[Claims]
1. A graphic equalizer having a plurality of display patterns, wherein an audio signal level detecting section for detecting an average value of audio signal levels in all frequency bands and a signal level in a frequency band is displayed according to the average level of the audio signals. A graphic equalizer, comprising: a display pattern selection unit that selects a display pattern to be displayed; and a display unit that displays the audio signal level of each frequency band based on the selected display pattern.
JP63133241A 1988-05-31 1988-05-31 Graphic equalizer Expired - Fee Related JPH0680996B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63133241A JPH0680996B2 (en) 1988-05-31 1988-05-31 Graphic equalizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63133241A JPH0680996B2 (en) 1988-05-31 1988-05-31 Graphic equalizer

Publications (2)

Publication Number Publication Date
JPH01302905A JPH01302905A (en) 1989-12-06
JPH0680996B2 true JPH0680996B2 (en) 1994-10-12

Family

ID=15100007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63133241A Expired - Fee Related JPH0680996B2 (en) 1988-05-31 1988-05-31 Graphic equalizer

Country Status (1)

Country Link
JP (1) JPH0680996B2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0720040B2 (en) * 1986-11-21 1995-03-06 ソニー株式会社 Voltage-current conversion circuit

Also Published As

Publication number Publication date
JPH01302905A (en) 1989-12-06

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