WO2018167902A1

WO2018167902A1 - Headphones

Info

Publication number: WO2018167902A1
Application number: PCT/JP2017/010593
Authority: WO
Inventors: 波多野　亮
Original assignee: ヤマハ株式会社
Priority date: 2017-03-16
Filing date: 2017-03-16
Publication date: 2018-09-20
Also published as: JPWO2018167902A1; JP6798606B2

Abstract

A headphone (1) includes: a determiner (17) for determining whether or not being worn on a user; switches (112, 114, 132 and 134) for selecting signals Lin and Rin supplied from an external apparatus when determination of being worn is made, and selecting a positive-phase signal and a negative-phase signal that are 180 degrees out of phase with each other when determination of being not worn is made; a sound generator (12L) for radiating a sound on the basis of one of the selected acoustic signals; and a sound generator (12R) for radiating a sound on the basis of the other of the selected acoustic signals.

Description

Headphone

The present invention relates to headphones.

In general, in a production work site in a studio, a PA (Public Address) site in a concert hall, and the like, various sounds such as instrument sounds and singer singing sounds are adjusted comprehensively. Specifically, this type of adjustment includes a variety of methods such as mixing various sounds, adjusting the quality, balancing, and adjusting the volume (see Patent Document 1).
Such adjustment requires a delicate and delicate sensitivity. For this reason, it is common for an engineer (user) to make necessary adjustments while monitoring a target sound while using headphones in a studio, a PA site, or the like.

Japanese Patent Application Laid-Open No. 2014-082770

By the way, the user may take off the headphones for some reason. In this case, sound leakage from the headphones that are not worn is picked up by a nearby microphone in the studio, and is heard by others (concerts, etc.) at the PA site. . For this reason, the user takes measures such as lowering the headphone volume when removing the headphones. However, when the situation is to be monitored when headphones are removed, the user needs to readjust the headphones volume, which is troublesome.
In addition, in order to prevent sound leakage from headphones that are not worn, it is possible to design headphones to improve the adhesion between ear pads, but in such a design, the side pressure increases. There is also a problem that it is not suitable for long-time wearing.

The present invention has been made in view of such circumstances, and one of its purposes is to provide a headphone capable of minimizing sound leakage in a non-wearing state for a user.

In order to achieve the above object, a headphone according to one aspect of the present invention determines whether or not a headphone is worn by a user, and when it is determined by the judgment device that the headphone is worn from an external device. A selector that selects the supplied first acoustic signal and the second acoustic signal and selects two acoustic signals that are in opposite phase to each other when it is determined by the determiner that they are not mounted; and A first sounding body that emits sound based on one of the acoustic signals selected by the selector; and a second sounding body that emits sound based on the other of the acoustic signals selected by the selector.

It is a figure which shows the headphones which concern on embodiment. It is a figure which shows the electrical structure of a headphone. It is a figure which shows an example of the non-wearing state of headphones.

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

FIG. 1 is a diagram illustrating a headphone 1 according to an embodiment. As shown in this figure, the headphone 1 has a substantially cylindrical shape and includes a headphone unit 5L for the left ear, a headphone unit 5R for the right ear having the same shape, and a headband 3.

The headband 3 has a shape that draws an arc in the longitudinal direction by using a metal or resin having elasticity. A headphone unit 5L is attached to one end of the headband 3, and an annular and flexible ear pad 10L is provided on the inner surface of the arc in the headphone unit 5L. The headphone unit 5L is provided with a sounding body 12L substantially at the center of the ring of the ear pad 10L.
A headphone unit 5R is attached to the other end of the headband 3, and an ear pad 10R is provided on the inner surface of the headphone unit 5R with respect to the arc. The headphone unit 5R is provided with a sounding body 12R substantially at the center of the ring of the ear pad 10R.

The cord 18 is pulled out from the cylindrical side surface of the headphone unit 5L. The code 18 is supplied with a stereo signal to be monitored, for example, digitally from an external device such as a mixing device. In the present embodiment, the stereo signal is configured to be input by wire via the cord 18, but may be configured to be received wirelessly.

When wearing the headphones 1, the user covers the ear pad 10L on the left ear and the ear pad 10R on the right ear while expanding the arc of the headband 3 with the

headphone units

5L and 5R. Due to the elasticity of the headband 3, a restoring force that tries to bring the ends of the headband 3 closer to each other is generated.
For this reason, the headphone unit 5L (ear pad 10L) and the headphone unit 5R (ear pad 10R) located at the end of the headband 3 apply lateral pressure to the user's head when worn. The headphone 1 is held at a predetermined position by this side pressure.

Further, when the headphone 1 is worn by the user in this way, the curvature of the headband 3 is increased by the amount of spread compared to when the headband 3 is not worn. A sensor 16 is an element for detecting whether the headphone 1 is worn by the user or not due to the difference in curvature. In the present embodiment, the sensor 16 is, for example, a strain gauge, and is provided at substantially the center in the longitudinal direction of the headband 3, and the resistance value changes according to the distortion of the headband 3, that is, according to the curvature of the headband 3. To do.
The sensor 16 may be other than a strain gauge as will be described later. Further, FIG. 1 shows a state in which the

headphone units

5L and 5R are expanded for explanation.

FIG. 2 is a block diagram showing an electrical configuration of the headphones 1. As shown in this figure, the headphone 1 includes the

sound generators

12L and 12R and the sensor 16, the determination unit 17, the

switches

112, 114, 132, and 134, the DACs (Digital to Analog Converter) 116 and 136, and the addition. A multiplier 122 and a multiplier 124.

The headphone 1 is supplied with a left channel signal Lin and a right channel signal Rin of the stereo signal via a cord 18. For example, if the signal Lin is the first acoustic signal, the signal Rin is the second acoustic signal.
Each of the

switches

112, 114, 132, and 134 is a single pole double throw type. When the signal S output from the determiner 17 is, for example, L level, the distance between the contact point a and the contact point c in the figure. Turn on as shown by the solid line. On the other hand, each of the

switches

112, 114, 132, and 134 is turned on as indicated by a broken line in the figure when the signal S is at the H level.
The

switches

112, 114, 132, and 134 constitute an example of a selector.

The signal Lin is supplied to the contact c of the switch 112. The contact a of the switch 112 is connected to the contact a of the switch 114, and the contact b of the switch 112 is connected to one input terminal of the adder 122. A contact c of the switch 114 is connected to an input terminal of the DAC 116. The DAC 116 converts the signal supplied to the input terminal into an analog signal and supplies it to the sounding body 12L. The sounding body 12L converts the analog signal converted by the DAC 116 into air vibration, that is, sound, and outputs it.
The signal Rin is supplied to the contact c of the switch 132. The contact a of the switch 132 is connected to the contact a of the switch 134, and the contact b of the switch 132 is connected to the other input terminal of the adder 122. The contact c of the switch 134 is connected to the input end of the DAC 136. The DAC 136 converts the signal supplied to the input terminal into analog and supplies it to the sound generator 12R. The sound generator 12R converts the analog signal converted by the DAC 136 into sound and outputs the sound.

The adder 122 adds the signal supplied to one input terminal and the signal supplied to the other input terminal, and adds the added signal to the contact b of the switch 114 and one input terminal of the multiplier 124. Supply. A coefficient “−1” is supplied to the other input terminal of the multiplier 124.
The multiplier 124 multiplies the signal supplied to one input terminal by the coefficient supplied to the other input terminal, and supplies the multiplied signal to the contact c in the switch 134.

The determiner 17 determines whether or not the curvature of the headband 3 indicated by the resistance value of the sensor 16 is equal to or greater than a threshold value, that is, whether or not the headphones 1 are worn by the user.
The determination unit 17 outputs the signal S at the L level when determining that the headphones 1 are worn by the user, and outputs the signal S at the H level when determining that the headphones 1 are not worn. To output.

In such a configuration, when the determiner 17 determines that the headphones 1 are worn by the user, the signal S is at the L level. Therefore, in each of the

switches

112, 114, 132, and 134, The contact point a and the contact point c are turned on. For this reason, the signal Lin is converted into an analog signal by the DAC 116 and a sound based on the analog signal is output from the sounding body 12L, and the signal Rin is converted into an analog signal by the DAC 136 and is based on the analog signal. Sound is output from the sound generator 12R.
Therefore, the user wearing the headphones 1 monitors the sound based on the signal Lin with the left ear and the sound based on the signal Rin with the right ear.

On the other hand, when the determination device 17 determines that the headphones 1 are not worn by the user, the signal S becomes H level. Therefore, in each of the

switches

112, 114, 132, and 134, the contact b and the contact c is turned on. Therefore, the signals Lin and Rin are added by the adder 122, the added signal is converted into an analog signal by the DAC 116, and a sound based on the analog signal is output from the sounding body 12L. Further, the signal added by the adder 122 is multiplied by a coefficient “−1” by the multiplier 124, and the multiplied signal is converted into an analog signal by the DAC 136, and a sound based on the analog signal is generated. Output from the body 12R.
Therefore, the sound emitted from the sounding body 12L and the sound emitted from the sounding body 12R have an opposite phase relationship, that is, approximately the same strength as the sound wave, and the way of swinging is opposite.

When the headphone 1 is not worn by the user, as shown in FIG. 3, the

headphone unit

5L and 5R are opposed to each other by the lateral pressure of the headband 3, and the

ear pads

10L and 10R are substantially in close contact with each other. To do. However, since there is a problem as described in the background art, the lateral pressure is not tightened in this embodiment. For this reason, the

ear pads

10L and 10R are not completely in close contact with each other, and as shown in FIG.

Even if the

ear pads

10L and 10R are completely in close contact with each other, if the configuration is not as in the present embodiment, that is, the

sound generators

12L and 12R are not configured to emit sound based on signals in an opposite phase relationship. Since the sound insulation of the

ear pads

10L and 10R is not perfect, sound leaks to the surroundings to some extent. If the

ear pads

10L and 10R are not in close contact with each other, the degree of sound leakage to the surroundings will increase.

On the other hand, in the present embodiment, when it is determined that the headphones 1 are not worn by the user, even if the

ear pads

10L and 10R are not completely in close contact with each other and a gap is generated in part. Since the sound emitted from the sounding body 12L and the sound emitted from the sounding body 12R have an opposite phase relationship, they cancel each other. For this reason, according to the headphones 1 according to the present embodiment, sound leakage in the non-wearing state can be reduced.

Note that if the user wears the headphones 1 that are not worn, that is, the headphones 1 in a state where the sound emitted from the sounding body 12L and the sound emitted from the sounding body 12R cancel each other, the signal S is determined. The device 17 switches to the L level. For this reason, the user can immediately monitor the stereo sound based on the supplied stereo signal without operating a switch or the like and without adjusting the volume again.

In the above-described embodiment, whether or not the headphones 1 are worn by the user is determined from the curvature of the headband 3, but can be determined in various other ways. For example, the headphone unit 5L (5R) may be provided with a non-contact sensor that detects that the user's ear has been covered to determine whether the user is wearing or not wearing. Further, another band may be provided inside the arc of the headband 3 in a tensioned state, and it may be determined to be attached when the band is pulled.

In the embodiment, when it is determined that the user is not wearing the sound, the sounding body 12L outputs a sound based on the addition signal of the signals Lin and Rin, and the sound based on the reverse phase signal of the addition signal However, the present invention is not limited to this. For example, the sound generator 12R may output a sound based on the addition signal, and the sound generator 12L may output a sound based on a reverse phase signal of the addition signal.

In the embodiment, the signals Lin and Rin are input digitally, but may be input analogly. When the signals Lin and Rin are input as analog signals, the

DACs

116 and 136 are not necessary.

In the above-described embodiment, the following inventions can be grasped from the viewpoint that a user can suppress sound leakage in a non-wearing state and can monitor quickly after wearing.

First, a determination device that determines whether or not the device is worn by the user, and when the determination device determines that the device is worn, the first acoustic signal and the second acoustic signal supplied from an external device are selected. When it is determined by the determiner that it is not attached, based on one of the selector that selects a positive phase signal and a negative phase signal that are in opposite phase to each other, and the signal that is selected by the selector A headphone including a first sounding body that emits sound and a second sounding body that emits sound based on the other of the signals selected by the selector is grasped.
According to the above headphones, in a non-wearing state, the sound emitted from the first sounding body and the sound emitted from the second sounding body cancel each other, so that sound leakage is suppressed to a low level.

In the headphone, when the determination unit determines that the headphone is not worn, the selector selects an addition signal of the first acoustic signal and the second acoustic signal as the positive phase signal, and the addition signal It is good also as a structure which selects the signal which carried out reverse phase of as a said reverse phase signal.
Further, in this configuration, an adder that adds the first acoustic signal and the second acoustic signal and outputs the added signal, and an anti-phaser that outputs the inverted signal by dephasing the added signal May be included.

DESCRIPTION OF SYMBOLS 1 ... Headphone, 5L, 5R ... Headphone unit, 10L, 10R ... Ear pad, 12L, 12R ... Sound generator, 16 ... Sensor, 17 ... Determinator, 112, 114, 132, 134 ... Switch, 122 ... Adder, 124 ... Multiplier.

Claims

A determiner for determining whether or not the user is wearing;
When it is determined by the determiner that the device is attached, the first acoustic signal and the second acoustic signal supplied from an external device are selected, and when it is determined by the determiner that the device is not attached, A selector for selecting a positive-phase signal and a negative-phase signal in an anti-phase relationship;
A first sounding body that emits sound based on one of the signals selected by the selector;
A second sounding body that emits sound based on the other of the signals selected by the selector;
Including headphones.
When it is determined by the determiner that it is not attached,
The selector is
Selecting the sum signal of the first acoustic signal and the second acoustic signal as the positive phase signal;
The headphone according to claim 1, wherein a signal obtained by dephasing the sum signal is selected as the anti-phase signal.
An adder for adding the first acoustic signal and the second acoustic signal and outputting the added signal;
The headphone according to claim 2, further comprising: an anti-phaser that dephases the sum signal and outputs the anti-phase signal.