JPS62299200A - Stereo headphone - Google Patents

Abstract

PURPOSE:To hear a sound image fixed at a sound field by a listener with a simple constitution by being equipped with the generating device of plural induced magnetic fields fixed at the sound field, extracting the induced magnetic fields with plural magnetic electric converters fixed at a headphone and supplying the linear linking of a magnetic electric converter output to right and left headphones. CONSTITUTION:Inputs terminals 11-14 input respective signals FL (front left), FR (front right), BL (back left) and BR (back right) of a four-channel stereo. The linear linking of the FL, FR, BL and BR of a matrix circuit 1 is given to the input of the amplifier of next steps 21-23, and the output of amplifiers 21-23 is given through resistances 31-33 to coils 41-43 (Lx-Lz) spatially arranged. The induced magnetic field generated by the induced magnetic field generating part is converted to an electric signal by pick-up coils 51 and 52, and supplied through equalizer amplifiers 61 and 62, a matrix circuit 7 and amplifiers 81 and 82 to right and left headphones 91 and 92.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to stereo headphones for reproducing audio signals.

Conventional technology Conventional stereo headphones directly supply the left and right sounds, R, taken from microphones etc. fixed in the sound field to the left and right headphones.

Problems to be Solved by the Invention However, in the above configuration, the sound image is fixed to the headphones, that is, to the listener's ears, which is contrary to the fact that the sound image is originally fixed to the sound field.

In view of the above-mentioned problems, the present invention provides stereo headphones that have a simple configuration and allow listeners to hear a sound image fixed in a sound field.

Means for Solving the Problems In order to solve the above problems, the present invention creates an induced magnetic field in the sound field, extracts the induced magnetic field using a plurality of magneto-electrical transducers fixed to the headphones, and determines the directivity of the magneto-electrical transducers. This configuration utilizes the fact that an output that changes depending on the direction of the listener is obtained from the listener, and supplies a linear combination of the outputs to the left and right headphones.

Operation According to the present invention, with the above-described configuration, outputs that change depending on the direction of the listener can be obtained from the left and right headphones. By applying an appropriate induction magnetic field and appropriately linearly combining the outputs of each magneto-electric transducer as in the embodiment described later, it is possible to obtain a headphone output that makes the sound image appear fixed to the sound field to the listener. It will be.

Example Below Regarding stereo headphones according to an example of the present invention,
This will be explained with reference to the drawings.

FIG. 1 shows a block diagram of stereo headphones according to a first embodiment of the present invention.

FIG. 1 is divided into an induced magnetic field generating section 100 and a headphone section 200. In FIG. 1, reference numerals 11, 12, 13, and 14 are input terminals to which four-channel stereo signals FL (front), FR (front cloth), BL (rear left), and BR (rear right) are input. 1 is a matrix circuit, which includes the aforementioned FL, FR,
A linear combination of BL and BR is given to the input of the amplifier in the next stage 21, 22, 23. The output of the amplifier 21.22.23 is passed through a resistor 31.32.33 to a coil 41.42.43 (LX) spatially arranged as in FIG.

LY, L2). The induced magnetic field generated by the induced magnetic field generator is converted into an electric signal by pickup coils 51 and 52 spatially arranged as shown in FIG. Since the voltage generated in the big amplifier coil is small and is obtained by differentiating the induced magnetic field, it is applied to the next stage matrix circuit 7 through equalizer amplifiers 61 and 62 having appropriate amplification factors and integral characteristics. The matrix circuit 7 converts the linear combination of the outputs of the equalizer amplifiers 61 and 62 into amplifiers 81 and 82.
give to The signal passing through the amplifier 81.82 obtains sufficient power to drive the headphones 91.92, and is supplied to the left and right headphones 91.92.

Regarding the stereo headphones configured as above,
The operation will be explained below using FIG. 1, FIG. 2, FIG. 3, and FIG. 4.

In matrix circuit 1 in Fig. 1, amplifier 21.22.2
3 is set to vX1vY2v2 and the following calculation is performed.

Therefore, the amplification factor of amplifier 21, 22, 23 or resistor 3
By appropriately setting the resistance values of 1, 32, and 33, the magnetic field shown in FIG. 4 can be generated near the center of FIG. 2. However, H in Figure 4
X, HY, and H2 are given by the following equations.

FIG. 5 shows the direction of the listener relative to the sound field. In FIG. 5, reference numeral 10 indicates listeners 91 and 92 left and right headphones. Assuming that a listener wearing headphones faces the direction shown in FIG. 5, the magnetic field H along the quaff coil 61 becomes Hy=-HXsin θ+H, cos θ. Therefore, on the headphone side, pink amplifier coil 5
1.52 and equalizer amplifiers 61 and 62 are used, the input terminal of the matrix circuit 7 In the matrix circuit 7 in FIG.

(C: constant) Therefore, if the amplifiers 81 and 82 have the same characteristics, the left and right headphones 91 and 92 are driven by the following voltages 1 and r.

(C: constant) To summarize the above, l and r are given by the following equations.

(C: constant) The above equation shows that sounds toward the listener's ears are louder (and sounds in the opposite direction from the ears are louder).

As described above, according to this embodiment, a sound image fixed in the sound field can be provided to the listener.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 shows a block diagram of stereo headphones according to a second embodiment of the present invention.

FIG. 6 is divided into an induced magnetic field generating section 100 and a headphone section 200. Further, the headphone section in FIG. 2 is the same as that in the first embodiment. In FIG. 6, reference numerals 11 and 12 are input terminals for inputting two-channel stereo signals (left) and R (right).

1 is a matrix circuit, and as mentioned above, the linear combination of H is applied to the input of the amplifier in the next stage 22 and 23. 22.23
The output of the amplifier is spatially connected through resistors 32 and 33 to the second
Coils 42 and 43 arranged so that LX is omitted from the diagram
(LY, L2). The induced magnetic field generated by the induced magnetic field generator is converted into an electric signal by pickup coils 51 and 52 spatially arranged as shown in FIG. Since the voltage generated in the pink amplifier coil is small and is obtained by differentiating the induced magnetic field, it is applied to the next stage matrix circuit 7 through equalizer amplifiers 61 and 62 having appropriate amplification factors and integration characteristics. The matrix circuit 7 converts the linear combination of the outputs of the equalizer amplifiers 61 and 62 into amplifiers 81 and 81.
Give to 82. The signal passing through the amplifier 81.82 obtains sufficient power to drive the headphones 91.92, and is supplied to the left and right headphones 91.92.

Regarding the stereo headphones configured as above,
The operation will be explained below using FIG. 6, FIG. 2, FIG. 3, and FIG. 4.

In the matrix circuit 1 in FIG. 6, the following calculation is performed when the inputs of the amplifiers 22 and 23 are 7 and 2.

(C: constant) Therefore, the amplification factor of amplifier 22.23 or resistance 32.3
By appropriately setting the resistance value of 3, a magnetic field with HX omitted from FIG. 4 can be generated near the center of FIG. 2. However, H9 and H2 in FIG. 4 are given by the following equations.

(Cj constant) On the other hand, if the listener wearing headphones is facing the direction shown in Fig. 5, the magnetic field H along the pink-up coil 61 becomes Hy-HYCO3θ.Therefore, on the headphone side, the pickup coil 5
1.52 and the equalizer amplifier 61.62, the V given to the input terminal of the matrix circuit 7 by the following formula,
, V2 are obtained.

(C: constant) In the matrix circuit 7, the amplifier 81.82 human power is V, , V
, then perform the following operation.

(C: constant) The amplifiers 81 and 82 have the same characteristics, and the left and right headphones 91 and 92 have the following voltage 1. Driven by r.

(C; constant) To summarize the above, l and r are given by the following equations.

(C: constant) The above equation shows that sounds toward the listener's ears are louder, and sounds in the opposite direction from the ears are louder.

As described above, according to this embodiment, a sound image fixed in the sound field can be provided to the listener.

Effects of the Invention As described above, the present invention includes a generator for generating a plurality of induced magnetic fields fixed to a sound field, extracts the induced magnetic fields by a plurality of magneto-electrical transducers fixed to a sound field, and generates the above-mentioned magneto-electric conversion. By supplying a linear combination of the device outputs to the left and right headphones, it is possible to provide the listener with a sound image fixed in the sound field with a simple configuration, which is of practical use.

[Brief explanation of the drawing]

Figure 1 is a block diagram of stereo headphones according to the first embodiment of the present invention, Figure 2 is a layout diagram of the induced magnetic field generating coil in Figure 1, and Figure 3 is a layout diagram of the pink amplifier coil in Figure 1. , FIG. 4 is a diagram of the induced magnetic field created by the induced magnetic field generating coil of FIG. 1, FIG. 5 is a diagram showing the direction to the listener's sound field, and FIG. 6 is a diagram of the stereo in the second embodiment of the present invention. FIG. 2 is a block diagram of headphones. 1... Matrix, 11, 12, 13. 14.
Axis...Input terminal, 21, 22.23...Amplifier, 31°32.33...Resistance, 41,42.
43...Coil, 51.52...Pickup coil, 61゜62...Equalizer amplifier, 7...Matrix, 81.82...
...Amplifier, 91...Left headphone, 92...
... Radphone to the right, 10 ... Listener, 100
...Induced magnetic field generating section, 200...Headphone section.

Claims (1)

[Claims] A plurality of induced magnetic field generators are fixed to the sound field, and the induced magnetic fields are extracted by a plurality of magnetoelectric transducers fixed to the headphones, and a linear combination of the outputs of the magnetoelectric transducers is supplied to the left and right headphones. Stereo headphones.