JPS6386997A - Headphone - Google Patents

Abstract

PURPOSE:To accurately obtain a stereoscopic sound with enough presence feeling by bisecting the frequency band of a sound signal and permitting an electroacoustic transducer to convert the one into a sound wave and rendering a bone propagation receiver to convert the other into a vibrating sound. CONSTITUTION:A division circuit 11 bisects the sound signal into the frequency band of which the electroacoustic transducer 12 and the bone propagation receiver 14 are charged. Out of 1st and 2nd sound signals, the 1st one is converted into a sound wave by the electroacoustic transducer 12 to vibrate eardrums, while the 2nd one is converted into a mechanical vibration by the bone propagation receiver 41 to transmit it to a skull. As another method, a filter 14 takes out only signals in a specific frequency range among sound signals, that is, signals in low and high frequency ranges, to which ears hardly hear. The taken- out signals are transmitted to the skull through the bone propagation receiver 14. Thus presence feeling is enhanced.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a bone conduction receiver that converts audio signals into mechanical vibrations and transmits the vibrations to the skull, in addition to a normal sound wave emission type electroacoustic transducer. The present invention relates to headphones equipped with.

(Prior Art) Acoustic devices used for listening to music, such as record players, tape recorders, and radio receivers, are divided into 1-channel, 2-channel, and 4-channel types in order to faithfully reproduce music and create an atmosphere of performance. It is progressing towards a channel type.

With the one-channel type, the output of the sound collected by one microphone is transmitted through one transmission line, and is listened to with only one ear using an earphone or Raddon, so the direction information of the sound source is not transmitted. is not transmitted and three-dimensional sound cannot be obtained. In order to obtain a sense of direction to a sound source, the loudness of the sound in both ears,
Information on the phase and arrival time difference of the sound is required.

Therefore, with a two-channel type, the sound source is picked up by two microphones on the left and right, and the output of the left microphone is heard in the left ear and the output of the right microphone is heard in the right ear using earphones or headphones. Since directional information is transmitted, three-dimensional sound is obtained, although it is incomplete. However, in an actual music performance, sounds fly in all directions, including direct sound, reflected sound, and reverberation, so in order to capture this more accurately,
In the 4-channel type, four microphones are installed in four directions, and the microphones are played back by four speakers through a dedicated transmission path, expanding the localization of the sound image from front to back and from side to side, approaching 3-dimensional sound. .

Conventionally, headphones used in this type of audio device come in binaural and monaural types, but both types have an electro-dynamic or electrostatic type electroacoustic transducer housed in a case to which a headband is attached. ing. This electroacoustic transducer converts the audio signal from the main body of the audio device into a sound wave and emits it toward the eardrum.For example, in an electrodynamic type, when an audio current flows through a conductor placed in a magnetic field, The structure is such that a conductor vibrates due to electromagnetic induction, and a sound wave is emitted from a diaphragm directly connected to the conductor.

In 2-channel headphones, one electroacoustic transducer is housed in each case attached to both ends of the head, and in 4-channel headphones, two electroacoustic transducers are housed in each case. The instruments are housed in a space designed to produce three-dimensional sound.

(Problem to be Solved by the Invention) However, although the rM two-channel type or four-channel type headphones described above can provide a certain degree of stereophonic sound, they do not allow you to feel the vibrations of the sound with your body as you would with a speaker. However, there was a problem in that the sense of realism was poor.

The present invention provides headphones that solve the problem of the prior art, which is that the sense of realism is poor.

(Means for Solving the Problem) In order to solve the above-mentioned problem, in the first invention, in a headphone that is attached to the ear and worn on the head with a band, the headphone at least divides the audio signal into two frequency bands. an electroacoustic transducer that converts the first audio signal into a sound wave and radiates it to the eardrum side; It consists of a bone conduction receiver that converts signals into mechanical vibrations and transmits the vibrations to the skull.

Further, in a second invention, the headphones include at least a filter for extracting a specific audio signal in a specific frequency band from an audio signal, an electroacoustic transducer for converting the audio signal into a sound wave and radiating it toward the eardrum, and the specific audio signal. It consists of a bone conduction receiver that converts audio signals into mechanical vibrations and transmits the vibrations to the skull.

(Function) According to the first invention, since the headphones are configured as described above, the dividing circuit divides the audio signal into the frequency bands that the electroacoustic transducer and the bone conduction handset have, and Of the first and second audio signals, the first audio signal is converted into a sound wave by an electroacoustic transducer and vibrates the eardrum, and the second audio signal is converted into mechanical vibration by a bone conduction receiver and is transmitted to the cranial membrane. tell.

By transmitting sound vibrations to the auditory nerve through the ears and bones in this way, the sense of reality can be improved.

According to the second aspect of the invention, only signals in a specific frequency band, such as low or high frequency signals that are difficult to hear, are extracted from the audio signal using a filter and transmitted to the skull through a bone conduction receiver. As a result, the sense of realism can be improved similarly to the first invention. Therefore, the above-mentioned problem can be eliminated.

(Embodiment) FIG. 1 is a configuration block diagram of headphones showing an embodiment of the first invention.

In the figure, 1 is a two-channel type acoustic device main body,
Left and right audio signals S output from this audio device Honbokuko are supplied to binaural headphones 10, respectively.

The headphones 10 have a dividing circuit 11, and the dividing circuit 1
1, an electroacoustic transducer 12 is connected to one output side, and an amplifier 13 and a bone conduction receiver 14 are connected to the other output side. The dividing circuit 11 divides the audio signal S into signals in two frequency bands, for example, audio frequencies 20H7 to 20KH.
2 into a first audio signal S1 in a comparatively high frequency region and a second audio signal S2 in a lower frequency region than that, and send the first audio signal S1 to the electroacoustic transducer 12 and send it to the second audio signal S1. This circuit supplies the audio signal S2 to the bone conduction receiver 14 through the amplifier 13, and is composed of a capacitor, a coil, and the like. The electroacoustic transducer 12 converts the first audio signal S1 into a sound wave and radiates it toward the eardrum, and may have various structures such as an electrodynamic structure, an electrostatic structure, and a piezoelectric structure. It consists of The bone conduction phone 14 converts the second audio signal S2 amplified by the amplifier 13 into mechanical vibrations and transmits the vibrations to the skull. They are composed of various structures such as electrodynamic structure, electrostatic structure, and piezoelectric structure.

FIG. 2 is a perspective view of one side of the headphones showing the implementation example of FIG. 1, and FIG. 3 is a schematic enlarged sectional view thereof.

This headphone 10 has an extendable headband 20 that can be hung on the head, and a case 21 having an opening for storing the headphone body is attached to both ends of the headband 20. An elastic member 22 for earmuffs made of sponge or the like is attached to the opening of the case 21, and
In addition to the dividing circuit 11 and amplifier 13 shown in FIG. 1, the case 21 houses, for example, an electrodynamic electroacoustic transducer 12 and an electromagnetic bone conduction receiver 14.

The electrodynamic electroacoustic transducer 12 has a package 12A having an opening on the front surface, and a permanent magnet 12B and a magnetic pole 12C magnetically coupled to the permanent magnet 12B are installed inside the package 12A. Furthermore, a moving coil 120 is attached to the sliding automatic in the magnetic field around the outer periphery of the permanent magnet 128, and a diaphragm 12E is stretched between the moving coil 120 and the inner wall of the package 12A.

The electromagnetic type bone conduction receiver 14 has a package 14A having an opening on the front surface, and inside the package 14A there is a permanent magnet 14B and a magnetic pole 14C magnetically coupled to the permanent magnet 14B.
14D is installed. Further, a coil 14F is wound around a magnetic pole 14G facing the permanent magnet 14B via a coil bobbin 14E, and a vibrating body 14G made of a magnetic material is stretched on the inner wall of the package 14A at a position where it can come into contact with and separate from the magnetic poles 14G and 14D. ing.

In addition, on the front side of the vibrating body 14G, a pressure contact body 1 made of resin or the like is provided.
4H is protruded from the front opening of the package 14A so as to be able to protrude and retract via the damper 14I.

The operation of the headphones 10 configured as above will be explained.

The headband 20 is put on the head and the elastic member 22 is placed on the ear. At this time, the electroacoustic exchanger 12 is positioned on the eardrum side, and the pressure contact #14 of the bone conduction receiver 14 is applied to the bone of the head near the ear.

Then, when the audio signal S is supplied from the audio device main body 1 to the headphones, this audio signal S is divided by the dividing circuit 11 into first and second audio signals S1 and S2 having different frequency bands.
The first audio signal S1 is applied to the electroacoustic transducer 12, and the second audio signal S2 is applied to the amplifier 13.

In the electroacoustic transducer 12, an audio signal $1 flows through the moving coil 12D, and the moving coil 120 vibrates due to the electromagnetic induction effect with the magnetic field generated by the magnetic pole 12C, and a sound wave is emitted from the diaphragm 12E directly connected to the moving coil 120. Ru. These sound waves are transmitted to the auditory nerve via the eardrum.

Further, the second audio signal S2 input to the amplifier 13 is amplified by the amplifier 13 and then provided to the bone conduction receiver 14. Then, the amplified second audio signal S2 flows through the coil 14F of the bone conduction receiver 14, and the magnetic poles 14C, 14
The magnetic field generated by 0 increases or decreases depending on the second audio signal S2, and the diaphragm 14G vibrates.

This vibration is transmitted from the pressure contact body 14H to the auditory nerve via the skull.
I can say that. This allows you to listen to realistic 3D sound.

In this embodiment, the frequency band of the audio signal S is divided into two,
For example, relatively high frequency bands are converted into sound waves by the electroacoustic transducer 12, and relatively low frequency bands are vibrated by the bone conduction receiver 14, which has the following advantages.

■ The playback frequency band can be widened. Since sound is transmitted from separate diaphragms 12E and 14G for each frequency band, various modulation distortions are small. Furthermore, it is easy to correct the frequency characteristics. Therefore, the accuracy of sound reproduction is increased.

■ You can listen to the sound through your eardrums and bones, and feel the vibrations of the sound throughout your body, providing immersive 3D sound. Note that by inserting a delay circuit on the bone conduction receiver 14 side and delaying the second audio signal S2, it is also possible to produce an echo effect and improve the stereophonic sound.

(2) If the amplifier 13 is provided with a volume adjuster, or the electroacoustic transducer 12 is also provided with an amplifier with a volume adjuster, the volume on the eardrum side and the tube side can be easily adjusted.

(2) By constructing the electric circuits such as the dividing circuit 11 and the amplifier 13 using integrated circuits and miniaturizing them, the entire headphone 10 can be miniaturized.

■ Can be used as is for conventional 2-channel audio equipment.

FIG. 4 is a perspective view of the headphones 10 showing another implementation example of FIG. 1.

In this headphone 10, the bone conduction receiver 14 is attached to the case 2.
1, and the bone conduction receiver 14 is attached to the case 21 via an elastic support member 30. In this way, the case 21 can be made smaller and the bone conduction receiver 14 can be placed at an appropriate position on the skull. Here, if the support member 30 has a structure that allows its length to be adjusted, or a structure that allows it to rotate about the center of the case 21 as shown by the arrow in FIG. 4, the bone conduction receiver can be placed in a more appropriate position. You can guess 14.

FIG. 5 is a configuration block diagram of headphones showing an embodiment of the second invention.

This headphone 40 differs from the one shown in FIG. 1 in that a filter 41 is connected to the bone conduction receiver 14 instead of the dividing circuit 11. Here, the filter 41 is a circuit that extracts a specific frequency band from the audio signal S, for example, a specific audio signal SO of a low frequency or high frequency that is hard to be felt by the eardrum, and supplies it to the bone conduction receiver 14 through the amplifier 13. The headphones 40 having such a configuration are implemented, for example, as shown in FIGS. 2 to 4.

In this embodiment, the audio signal S is directly converted into a sound wave by the electroacoustic transducer 12 and transmitted to the eardrum, and the audio signal S
For example, a filter 41 extracts a specific audio signal SO, such as a bass or treble sound that is difficult to feel on the eardrum, and extracts the signal SO.
is amplified by an amplifier 13, converted into mechanical vibration by a bone conduction receiver 14, and transmitted to the skull. Therefore, sounds that are difficult to hear with the ears can be heard accurately through the skull.
You can get realistic 3D sound.

In this embodiment, similarly to the embodiment of the first invention, a delay circuit is inserted on the bone conduction receiver 14 side to produce an echo effect, or the electroacoustic exchanger 12 or the bone conduction receiver 14 side is inserted with a delay circuit. It is also possible to create a 1G configuration in which a volume controller is installed in the terminal to adjust the volume.

In addition, 1. The second invention is not limited to the illustrated embodiment,
Various modifications are possible. For example, the mounting structure shown in FIG. 1 may be a structure other than those shown in FIGS. 2 to 4. The headphones 10 can be applied not only to a binaural structure but also to a monaural structure. Also, 1st. The second invention is also applicable to earphones that are inserted into the ear canal.

(Effects of the Invention) As described above in detail, according to the first invention, the frequency band of the audio signal is divided into two, one is converted into a sound wave by an electroacoustic exchanger, and the other is converted into a sound wave by a bone conduction receiver. Since the system converts the sound into vibrational sound, the sound is reproduced with high precision and provides a realistic three-dimensional sound.

In addition, according to the second invention, a specific audio signal is extracted using a filter and transmitted to the skull through a bone conduction receiver, so that sounds that are difficult to detect with the eardrum can be heard with high accuracy, and three-dimensional sound with a sense of realism is produced. can be obtained accurately.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a configuration block diagram of headphones showing an embodiment of the first invention, FIG. 2 is a perspective view of headphones showing an implementation example of FIG. 1, and FIG. 4 is a perspective view of headphones showing an example of mounting the pond in FIG. 1, and FIG. 5 is a configuration block diagram of headphones showing an embodiment of the second invention. 10, 40... Headphones, 11...
Division circuit, 12... Electroacoustic transducer, 13...
... Amplifier, 14 ... Bone conduction receiver, 41
······filter. Applicant's agent Kyo Kakimoto Enlarged sectional view of acid figure 2 Figure 3

Claims (1)

[Claims] 1. A dividing circuit that divides an audio signal into two frequency bands and outputs corresponding first and second audio signals; and a dividing circuit that converts the first audio signal into a sound wave and outputs the corresponding first and second audio signals. 1. A headphone comprising: an electroacoustic transducer that radiates sound toward the eardrum; and a bone conduction receiver that converts the second audio signal into mechanical vibration and transmits the vibration to the skull. 2. The headphone according to claim 1, wherein the dividing circuit is composed of a capacitor and a coil. 3. A filter that extracts a specific audio signal in a specific frequency band from the audio signal; an electroacoustic transducer that converts the audio signal into a sound wave and radiates it toward the eardrum; and a filter that converts the specific audio signal into mechanical vibration. Headphones characterized by being equipped with a bone conduction receiver that transmits the vibrations of the vibrations to the skull.