JPH0715210Y2 - Equalizer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an equalizer device having a defeat function, and more particularly to an equalizer device capable of automatically turning on / off the defeat function according to program content.

<Prior Art> FIG. 2 is a front view of a general equalizer device. In the figure, 1 is an equalizer main body. Reference numeral 2 is a display unit for displaying each frequency component of the audio signal, which is 3 to the right.
1.5Hz, 60Hz, 125Hz, 190Hz, 250Hz, 500Hz, 1KHz, 2.2
A frequency axis x having frequency scales of KHz, 4.5 Hz, 8 KHz, and 16 KHz, and a signal level axis y indicating a signal level from MIN to MAX in the upward direction are assigned. A plurality of (for example, 13) display elements 19 are arranged in a line in the signal level axis direction for each frequency band, and display element rows 20-1, 20-2, ...
11 are formed. Reference numeral 3 denotes an operation unit including various operation keys. A preset memory key 3P for setting and storing the frequency component of the audio signal according to the genre of music such as classical music and popular, or the performance environment of the music Up / down key 3L to adjust the level,
It is composed of a defeat key 3D that switches the frequency characteristic from the corrected state to the uncorrected state. As described above, various kinds of various performances can be enjoyed by selectively inputting various audio signals to the equalizer device 1 and performing a predetermined operation. Further, the above-mentioned equalizer device is usually a cassette deck player, an amplifier, a tuner,
Since it is used by being incorporated in an audio device composed of, etc., it is very convenient because the versatility is increased in the audio system.

<Problems to be solved by the invention> Looking at human voice signals in terms of frequency components, it is usually 800Hz to 3KH
It concentrates around z, and does not contain much other frequency components. Then, the audio signal of the music played in the music program of the radio broadcast or the television broadcast is corrected by the equalizer and is being listened to. Since it is not a flat frequency characteristic, it often feels strange. Therefore, in order to eliminate the discomfort, the user operates by operating the defeat key shown in FIG. 2D in FIG. 2 to make the frequency characteristic uncorrected.

However, in recent music programs, the number of performance songs and commercials has changed drastically, and even if it is not a commercial program, human conversations such as disc jockeys between songs are often inserted in music programs. Is coming. Therefore, the user operates the defeet key each time in order to reduce the discomfort described above, but this is not suitable for the current situation of recent music programs.
It is also very troublesome. In addition, since the defeet key cannot be operated when the entire music program is corrected by the equalizer and recorded on the cassette tape or the like by using the timer, it goes without saying that dissatisfaction remains when the recording is reproduced. Furthermore, considering the use in the passenger compartment,
The above operation is very dangerous if the operator himself is a driver.

Therefore, an object of the present invention is to provide an equalizer device which can automatically turn on / off the defeat function according to the program content.

<Means for Solving the Problem> In the present invention, the above-mentioned problem is achieved by a frequency characteristic control means capable of correcting and outputting the frequency characteristic of an input audio signal, and a bandpass for extracting a predetermined frequency band component from the input audio signal. A filter, a comparison means for comparing the output level from the band pass filter with the level of the input audio signal, and a control for changing the correction frequency characteristic in the frequency characteristic control means based on the comparison result of the comparison means. It is achieved by providing means.

<Operation> In the present invention, the filter output of the audio signal input to the bandpass filter and the audio signal before the input of the bandpass filter are compared by the comparison means, and the frequency characteristic is controlled by the control means based on the comparison result. .

<Embodiment> Hereinafter, an equalizer device according to the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an audio system to which the equalizer device according to the present invention is applied. It should be noted that although the portions corresponding to those in FIG. 2 are denoted by the same reference numerals and the description thereof is omitted, the key operation portion 3 is not provided with the defeat key 3D.

In the figure, reference numeral 4 denotes an external audio device group that generates an audio signal to be input to the equalizer device 1.
There are a CD player 4A, a tuner 4B, ..., A cassette deck 4N, etc. An audio signal switching unit 5 has an external audio device selection key (not shown) and has a function of selectively switching audio output of various external audio devices. Reference numeral 6 is an amplifier for amplifying an audio signal, and 7 is a speaker.

Next, the configuration of the equalizer device 1 will be described. Reference numeral 8 is a bandpass filter for extracting a predetermined band component from the audio signal (in the present embodiment, a band component of 800 Hz to 3 KHz is taken out), 9 is a comparison unit, 15 is an operational amplifier, R _OR R _OS
Is an input impedance of the reference signal voltage V _REF and the input signal voltage V _IN , and RF is a feedback resistor for feeding back a part of the output.

The comparison unit 9 outputs the signal V _OUt representing the difference between the reference signal voltage V _REF to be compared and the input signal voltage V _IN to the rectification unit 10. A rectifying unit 10 _{converts the} signal V _OUt output from the comparing unit 9 into a DC level signal V _DC and outputs it to the microcomputer 11.

Reference numeral 11 denotes a microcomputer, which includes a control unit 12 and a memory 13. When the direct current level signal V _DC is input from the rectifying unit 10, the microcomputer 11 controls the frequency characteristic control unit 14 according to the level of the signal V _DC or the operation of the key operation unit 3. The memory 13 is a writable and rewritable memory that stores frequency data in advance. A frequency characteristic control unit 14 has a function of receiving various control commands such as a defeat off command from the control unit 12 and controlling the frequency control element.

Next, the operation of the equalizer device according to the present invention will be described.

Now, as an audio signal source, an external audio device 4
It is assumed that the CD player 4A is selected from. FIG. 3A is a diagram showing frequency characteristics of the audio signal output of the CD player 4A. Next, the audio signal output of the CD player is input to the bandpass filter 8 and the predetermined band component is extracted. FIG. 3B shows a frequency characteristic diagram of the audio signal after passing through the bandpass filter 8. From the figure, it can be seen that a predetermined band of 800 Hz to 3 KHz is taken out. Next, the audio signal after passing through the bandpass filter 8 is used as an input signal voltage V _IN , and the audio signal before passing through the bandpass filter 8 is used as a reference signal voltage V _REF .
The difference V _OUt between the reference signal voltage V _REF and the input signal voltage V _IN is input to the comparison unit 9 and detected. FIG. 3C shows a frequency characteristic part of the audio signal detected by the comparison part 9. As shown in the figure, it can be seen that frequency components other than 800 Hz to 3 KHz are included.

The rectification unit 10 _converts the output signal V _OUt of the comparison unit 9 into a DC level signal.
It is converted to V _DC and output to the control unit 12 of the microcomputer 11. If the input DC level signal V _DC is equal to or higher than the preset signal level, the control unit 12 determines that a music signal has been input, and in this case, determines that the frequency characteristic control unit 14 is defeated off. Therefore, the frequency characteristic control unit 14
Then, the audio signal output of the CD player 4A is corrected by the value of the frequency data preset by the key operation unit 3, and then amplified by the amplifier 6 and output from the speaker 7.

Next, it is assumed that the tuner 4B is selected as the external audio device 4 instead of the CD player 4A, and the received broadcast happens to be a news program. Figure 3 (d) shows the tuner 4B
3 is a diagram showing frequency characteristics of the audio signal output of FIG. 800Hz-3
It can be seen that the audio signal is concentrated during KHz. Next, the audio signal output of the tuner 4B is the bandpass filter 8
Entered in. FIG. 3 (e) is a frequency characteristic diagram of the audio signal after passing through the bandpass filter 8. It can be seen that all the input audio signals have been extracted. Next, the audio signal after passing through the bandpass filter 8 is the input signal voltage V _IN.
As a speech signal before passing the band pass filter 8 is input to each comparator unit 9 as a reference signal voltage V _REF, the difference between V _OUT and the reference signal voltage V _REF and the input signal voltage V _IN is detected. In the case of an audio signal, since both V _REF and V _IN have almost the same output level as the frequency component contained in the signal, the output signal V _OUt in the comparison unit 9 is almost equal to zero, so the DC converted by the rectification unit 10 is used. The level signal V _DC also becomes substantially equal to zero. If the input DC level signal V _DC is below the preset signal level, the control unit 12 determines that a signal other than music is input, and in this case, turns the frequency characteristic control unit 14 defeet on. To judge. Therefore, in the frequency characteristic control unit 14, the audio signal output of the tuner 4B is input to the amplifier 6 without correction, and the audio signal with less discomfort is output from the speaker 7. After that, when changing to a music program or switching from the tuner 4B to another external input device and components other than 800Hz to 3KHz reach a certain level or higher, the defeat is turned off and the frequency data preset by the key operation unit 3 The frequency characteristic control unit 14 is controlled by the value. The comparison unit 9 may be configured by software in the microcomputer 11 instead of being configured by hardware. Also, instead of the bandpass filter 8, BEF (Ban
The same effect can be obtained by using d Eliminate Filter).

<Effects of the Invention> As described above, according to the present invention, a frequency characteristic control means capable of correcting and outputting the frequency characteristic of an input audio signal, a bandpass filter for extracting a predetermined frequency band component from the input audio signal, Comparing means for comparing the output signal level from the band pass filter and the level of the input audio signal, and control means for changing the correction frequency characteristic in the frequency characteristic control means based on the comparison result of the comparing means. Since it is provided, the defeet function can be automatically turned on / off according to the program content, which relieves the user from the hassle of having to press the defeet key each time the program content changes, making it suitable for the program content. It is possible to provide excellent sound quality.

[Brief description of drawings]

FIG. 1 is a block diagram of an audio system to which the equalizer device according to the present invention is applied, FIG. 2 is a front view of a general equalizer device, and FIG. 3 is a frequency characteristic diagram of audio signals and audio signals in each part of the equalizer device. Is. 1 ... equalizer device main body, 1A ... hand pass filter, 1B ... comparison section, 1C ... microcomputer, 1D ... frequency characteristic control section, 1E ... control section, 1F ... memory.

Claims (1)

[Scope of utility model registration request] 1. A frequency characteristic control means capable of correcting and outputting a frequency characteristic of an input audio signal, a bandpass filter for extracting a predetermined frequency band component from the input audio signal, and an output signal from the bandpass filter. Comparison means for comparing a level with the level of the input audio signal; and control means for changing the correction frequency characteristic in the frequency characteristic control means based on the comparison result of the comparison means. Equalizer device.