JPS6128476Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a graphical equalizer with a noise generator.

Generally, when using audio equipment such as a stereo system, if you want to change the listening room or obtain the desired acoustic characteristics, play the music using an appropriate music source to improve the auditory sense. Therefore, the circuit constants of the left/right balance adjustment volume adjuster and sound quality adjuster attached to the equalizer were adjusted. In this method of adjustment based on the sense of hearing, it takes time to make the adjustment, and it is difficult to make a suitable adjustment.

In addition to inappropriate adjustment methods that rely on the sense of hearing, adjustment methods that use measuring instruments such as noise generators and sound pressure level meters are known. However, it has disadvantages such as lack of simplicity, such as the necessity of using a measuring device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a graphic equalizer with a noise generator that eliminates the need for sound quality adjustment based on auditory sense using a music source and that can quickly and easily adjust sound quality.

The gist of the present invention also includes a bandpass filter whose input side is connected to an input terminal that receives a signal from a music source and has a predetermined bandwidth, and a bandpass filter which is connected to a rear stage of the filter and is connected to a speaker. An equalizer comprising a predetermined number of series circuits connected in parallel with a variable resistor, the equalizer being connected between a noise generator for generating a noise signal and the input terminal and the filter, and an input switch for selectively applying a noise signal from the noise generator or a signal from the input terminal to the filter;
A band switch is connected between the input switch and the filter and transmits or cuts off a signal from the input switch to the filter, and a band switch is connected to a band switch that transmits or cuts off a signal from the input switch to the filter, and a signal from a stage after the filter and before the variable resistor. an electro-acoustic transducer for electro-acoustic conversion of A graphic equalizer with a noise generator is characterized in that it is equipped with an adjustment switch for applying voltage.

Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

The accompanying drawings are schematic circuit diagrams showing an embodiment of the device according to the present invention.

In the figure, L and R input terminals 2 and 4, which receive signals from a record player, FM tuner, tape recorder, etc., are L
It is connected to the channel input switch 6 and the R channel input switch 8.

The switch 6 and the L channel speaker 10
and the first to nth L connected in parallel.
Channel bandpass filter 12-1, 12
-2, ..., 12-n are provided, and each filter is connected to a band switch 14-n on the switch 6 side.
1, 14-2, ..., 14-n and speaker 1
Variable resistors 16-1, 16-2, ..., 1 on the 0 side
6-n. Each variable resistor 16-1, 1
The signals from 6-2, . Further, the output side of each filter is connected to adjustment switches 20-1 and 20-2, respectively.
0-2, . . . , 20-n to the amplifier 22. An output terminal 24 receiving the output of this amplifier 22 is connected to an electroacoustic transducer 26 .

Similarly, between the switch 8 and the R channel speaker 30, first to nth R channel bandpass filters 32-1, 32-
2, . . . , 32-n are connected in parallel. Band switches 34-1, 34-2, ..., 34-n are provided on the switch 8 side of each filter, and a variable resistor 3 is provided on the speaker 30 side.
6-1, 36-2, ..., 36-n are provided,
The output is outputted from the output terminal 101 and applied to the speaker 30 via the output amplifier 38. Also, filters 32-1, 32-2, ..., 32-n
are adjustment switches 40-1, 40-2,...,
40-n to the amplifier 22.

Furthermore, a noise generator 42 connected to the switches 6 and 8 is provided.

Next, the operation of the apparatus of this embodiment having the above configuration will be explained.

In the conventional device, an input signal from an appropriate music source is applied to the input terminals 2 and 4,
Listen to the playback generated from the speakers 10 and 30,
The listener 44 listens to the variable resistors 16-1, 16-
2, ..., 16-n and 36-1, 36-
2,..., 36-n to adjust the sound quality.

In this embodiment, when the listener 44 adjusts the sound quality, he first switches the input switches 6 and 8 to the noise generator 42 side and applies the output to each filter. In the present invention, a white noise generator or a pink noise generator may be used as the noise generator 42. However, in the former case, the respective bandwidths of the first to nth filters f ₁ to f ₀ , f ₂ to f ₁ , ..., f _o −
It is desirable that the relationship f _{1 -} f ₀ = f ₂ - f ₁ =... = f _o - f _o-1 holds between f o-1, and in the latter case, f ₂ - f ₁ /f ₁ -f ₀ =f ₃ -f ₂ /f ₂ -f ₁ =...
It is desirable that the following relationship holds true: ...=fo _- fo _-1 /fo _-1 - _fo-2 .

Next, the band switches 14-1, 14-2, .
..., 14-n and 34-1, 34-2, ...
. . , 34-n, the switch 14-1 is closed and the remaining switches are opened, and the noise generator 4
Only the frequency components from _f0 to _f1 of the output signal from the amplifier 22 are applied to the electroacoustic transducer 26.
is switched to the amplifier 22 side. In this embodiment, the adjustment switches 20-1, 20-2, ...
..., 20-n and 40-1, 40-2, ...
, 40-n are linked together to form a link switch 46. A listener 44 listens to the output level or sound pressure level using, for example, a headphone as the electroacoustic transducer 26.
It is preferable that the electroacoustic transducer 26 has flat frequency characteristics.

Next, the interlock switch 46 is switched to the variable resistor side. Then, the electrical signal from the noise generator 42 is electroacoustic converted and emitted at a certain sound pressure level via the speaker 10. Listener 44 here
The variable resistor 16-1 is adjusted so that the speaker 10 emits sound at a level corresponding to the sound pressure level produced by the headphone 26.

Below, band switches 14-2, 14-3,...
. . , 14-n, 34-1, . and each variable resistor 20-2, 20-3, ..., 20-n, 40
-1, . . . , 40-n are set to suitable values.

After completing the above adjustment, switch input switches 6 and 8 to input terminals 2 and 4, and switch band switch 14-
1, 14-2, ..., 14-n, and 34-
1, 34-2, ..., 34-n, and further close the adjustment switches 20-1, 20-2,
..., 20-n, and 40-1, 40-2,
..., switch all of 40-n to the variable resistor side,
It is sufficient to use a normal circuit connection.

According to the present invention, it is possible to quickly and appropriately adjust the sound quality with a simple device configuration, and it is extremely useful.

[Brief explanation of the drawing]

The figure is a schematic circuit diagram showing an example in which the graphic equalizer with a noise generator according to the present invention is applied to the sound quality adjustment of a stereo device. 2, 4... Input terminal, 6, 8... Input switch, 10, 30... Speaker, 12-1, 12-
2,..., 12-n, 32-1, 32-2,...
..., 32-n...Band pass filter, 14-
1, 14-2, ..., 14-n, 34-1, 34
-2,...,34-n...Band switch, 16
-1,16-2,...,16-n,36-1,3
6-2,...,36-n...variable resistor, 18,
38...Output amplifier, 20-1, 20-2,...
..., 20-n, 40-1, 40-2, ..., 40
-n...Adjustment switch, 22...Amplifier, 2
4,100,101...output terminal, 26...electroacoustic transducer, 42...noise generator, 44...listener.

Claims (1)

[Scope of Claim for Utility Model Registration] A noise generator that generates noise containing frequency components of the entire audio frequency band; an input switch that selects an audio frequency signal such as music and the noise output; multiple band switches installed in parallel to split the signals to be selectively turned on and off, and to pass a frequency band with a predetermined range obtained by dividing the entire audio frequency band. a plurality of bandpass filters that respectively apply characteristics to each signal provided from each of the plurality of band switches; an adjustment switch that selects the output signals from these bandpass filters and outputs them in two directions; A variable resistor outputs after setting the level at which the signal given from each output side in one direction of the switch is supplied to the subsequent stage, and a signal given from each output side in the other direction of the adjustment switch is inputted. and an amplifier for driving an electroacoustic transducer used for sound pressure level comparison.