JP2017126873A - Stereo earphone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereo earphone device which changes the sound to be outputted, according to the wearing state to a user.SOLUTION: A stereo earphone device 100 includes left and right earphone units 13L, 13R, a source sound output section for receiving or reproducing and outputting the source sound signals of the left and right channels, wearing state detectors 161L, 161R for detecting the wearing state of the left and right earphone units 13L, 13R by the user, and a signal processing section 22 for changing the mode of output of the source sound signal to the left and right earphone units 13L, 13R, based on the detection results from the wearing state detectors 161L, 161R.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stereo earphone device that changes sound to be output in accordance with a wearing state to a user.

  Conventionally, a ring that can be hung on a user's neck and an earphone in which two cables extending from the ring are provided with a right-ear earphone and a left-ear earphone are known (see Patent Document 1). According to this earphone, with the ring on the neck, both the right earphone and the left earphone are used in both ears, and one of the right earphone and the left earphone is in one ear. It is possible to change to a use state in which the other earphone is attached and the earphone for the right ear and the earphone for the left ear are removed from both ears.

JP 2007-183920 A

  However, when only one of the right-ear earphone and the left-ear earphone is attached to one ear, the user cannot hear the sound output from the other earphone that is not attached to the ear. For this reason, when different sounds are output in the right channel and the left channel as in a stereo signal, the user cannot hear the sound output from the earphone not worn on the ear.

  Even when the earphone is not worn on the ear, sound is continuously emitted from the earphone. For this reason, the sound emitted from the earphone not worn on the ear becomes noise to the surroundings.

  This invention makes it a subject to provide the stereo earphone apparatus which changes the audio | voice to output according to the mounting state to a user.

  The stereo earphone device provided by the first aspect of the present invention includes a left and right earphone unit, a source sound output unit that receives or reproduces the source sound signal of the left and right channels, and outputs the left and right earphone units. A mounting state detection unit that detects the respective mounting states of the signal processing unit, and a signal processing unit that changes a mode of output of the source sound signal to the left and right earphone units based on a detection result of the mounting state detection unit. It is characterized by providing.

  In the above invention, the signal processing unit selects an earphone unit that outputs sound from the left and right earphone units based on a detection result of the wearing state detection unit, or a volume output from the left and right earphone units May be changed.

  In the above invention, when the wearing state detection unit detects that one of the left and right earphone units is not attached, the signal processing unit downmixes the audio signals of the left and right channels. The signal may be output to the other earphone unit.

  In the above invention, when the wearing state detecting unit detects that one or both of the left and right earphone units are not attached, the signal processing unit outputs a level of a signal output to the earphone unit that is not attached. Or the signal may be turned off.

  In the above invention, the microphone further includes a microphone that collects an external sound, and the signal processing unit mixes the external sound with the source sound signal, and based on a detection result of the wearing state detection unit, the mixing process On / off may be switched, or the mixing ratio may be changed.

  In the above invention, when the wearing state detection unit detects that one of the left and right earphone units is not attached, the signal processing unit turns off the mixing or the mixing The ratio may be reduced.

  In the above invention, the apparatus further includes an annular mounting portion that is mounted on a user's neck, and the left and right earphone units are connected to left and right cables extending from the mounting portion, respectively, and the mounting portion is connected to the left and right earphones. You may have a right-and-left fixing | fixed part to which a unit or the said right and left cables are each fixed.

  In the above invention, the wearing state detection unit includes a sensor that detects that the earphone unit or the cable is fixed to the fixing unit, and the sensor includes the earphone unit or the cable fixed to the fixing unit. May be determined that the earphone unit or the earphone unit connected to the cable is not attached.

  According to this invention, the stereo earphone device can change the sound to be output in accordance with the wearing state to the user.

1 is a front view of a stereo earphone device according to Embodiment 1 to which the present invention is applied; It is a front view which shows the state which the user is using the stereo earphone apparatus. It is a block diagram of a stereo earphone device. It is a functional block diagram of a stereo earphone device. It is a flowchart which shows operation | movement of a stereo earphone apparatus. FIG. 5 is a front view of a stereo earphone device according to a second exemplary embodiment.

[Embodiment 1]
FIG. 1 is a front view of a stereo earphone device 100 according to a first embodiment to which the present invention is applied. The stereo earphone device 100 includes a ring 10, a signal processing unit 11, a left cable 12L, a right cable 12R, earphone units 13L and 13R, a left fixing portion 16L, and a right fixing portion 16R. In the following drawings, the arrow R indicates the right direction of the stereo earphone device 100, and the arrow L indicates the left direction. Arrow U indicates the upward direction, and arrow D indicates the downward direction. Arrow F indicates the forward direction, and arrow B indicates the backward direction.

  The ring 10 is an annular body that can be worn on the neck by the user. The ring 10 is formed using, for example, a soft synthetic resin material. The material of the ring 10 is not particularly limited. It is preferable that the ring 10 has a design that is excellent in fashion, such as a surface color, a pattern, or a shape when hung on a neck. Inside the ring 10 are a left cable 12L and a right cable 12R connected to the signal processing unit 11, and a cable (not shown) for connecting the signal processing unit 11 to the left fixing portion sensor 161L and the right fixing portion sensor 161R. Is arranged. The ring corresponds to the mounting portion of the present invention.

  The ring 10 can be separated and joined by the attaching / detaching portion 101. The detachable part 101 has a first detachable member 102 and a second detachable member 103. The first detachable member 102 has a recess 104. The second detachable member 103 has a convex portion 105. By inserting the convex portion 105 into the concave portion 104, the first detachable member 102 and the second detachable member 103 are joined, and the ring 10 becomes an annular body. By pulling out the convex portion 105 from the concave portion 104, the first detachable member 102 and the second detachable member 103 are separated. With the first detachable member 102 and the second detachable member 103 separated, the ring 10 is hung around the user's neck, and the first detachable member 102 and the second detachable member 103 are joined to each other to attach the ring 10 to the user's neck. Can be worn on the neck. In the present embodiment, the ring 10 is mounted so that the detachable portion 101 is positioned in front of the user's neck. You may make it mount | wear so that the attachment or detachment part 101 may be located in the back or side of a user's neck. In addition, the shape and structure of the attaching / detaching portion 101 are not limited. For example, the detachable portion 101 may be joined by another method (for example, a magnet) instead of the method of fitting the convex portion 105 to the concave portion 104.

  The signal processing unit 11 has a Bluetooth (registered trademark) communication unit 25. The Bluetooth communication unit 25 inputs a source sound (audio signal) from an audio player or the like that has established Bluetooth communication. The audio signal input from the Bluetooth communication unit 25 is subjected to sound processing such as sound quality adjustment by the signal processing unit 11 and is output from the earphone units 13L and 13R. Note that an audio jack or the like may be provided instead of the Bluetooth communication unit, and may be connected to another audio player by wire.

  The left cable 12L and the right cable 12R are cables that connect the signal processing unit 11 and the earphone units 13L and 13R. As described above, the left cable 12L and the right cable 12R are also arranged inside the ring 10 and connected to the signal processing unit 11. The left cable 12L exits from the inside of the ring 10 at the left branch portion 121L and branches outwardly with respect to the ring 10. The right cable 12 </ b> R exits from the inside of the ring 10 at the right branch portion 121 </ b> R and branches outwardly with respect to the ring 10. In the present embodiment, the left branch portion 121 </ b> L is disposed at the left portion of the ring 10, and the right branch portion 121 </ b> R is disposed at the right portion of the ring 10. For this reason, the user can easily perform an operation of attaching the earphone units 13L and 13R to the ear by pinching the left cable 12L and the right cable 12R with the right hand or the left hand.

  Earphone units 13L and 13R are canal type earphones. The earphone unit 13L is attached to the opposite end of the left cable 12L with respect to the left branch portion 121L. Earphone unit 13R is attached to the opposite end of right cable 12R with respect to right branch 121R. The earphone unit 13L has a speaker 144L and a microphone 146, and the earphone unit 13R has a speaker 144R. The microphone 146 acquires ambient sound (external sound) and outputs a sound collection signal. The collected sound signal is processed by the signal processing unit 11 and output from the earphone units 13L and 13R. The earphone units 13L and 13R transmit the sound based on the external sound collected by the microphone 146 and the audio signal from the audio player to the user when the user wears on the ear.

  The left fixing portion 16L and the right fixing portion 16R are provided on the ring 10, respectively. The left fixing portion 16L is provided on the right portion of the ring 10, and can fix the earphone unit 13L. The right fixing portion 16R is provided on the left portion of the ring 10 and can fix the earphone unit 13R. When either one of the earphone units 13L and 13R is not used or when both are not used, the unused earphone units 13L and 13R can be fixed to the left fixing portion 16L and the right fixing portion 16R. The left fixing portion 16L and the right fixing portion 16R may have a structure in which the earphone units 13L and 13R are sandwiched between them, or may be fixed by a magnet or the like.

  The left fixing portion 16L is provided with a left fixing portion sensor 161L, and the right fixing portion 16R is provided with a right fixing portion sensor 161R. For example, a touch sensor can be used as the left fixing part sensor 161L and the right fixing part sensor 161R. When the earphone unit 13L is fixed to the left fixing portion 16L and when the earphone unit 13R is fixed to the right fixing portion 16R, the left fixing portion sensor 161L and the right fixing portion sensor 161R output detection signals. For example, when the user attaches only the earphone unit 13L to the left ear and does not use the earphone unit 13R, when the earphone unit 13R is fixed to the right fixing portion 16R, the right fixing portion sensor 161R is connected to the right earphone unit 13R. It is detected that the fixing part 16R is fixed. Thereby, it can be detected that the earphone unit 13R is not attached to the user's ear. The left fixing part sensor 161L and the right fixing part sensor 161R correspond to the mounting state detection part of the present invention.

  FIG. 2 is a front view showing a state where the user U is using the stereo earphone device 100. It is assumed that the user U is using the stereo earphone device 100 on the neck N while facing forward.

  In FIG. 2A, the earphone units 13L and 13R are attached to the left and right ears EL and ER of the user U. In other words, the earphone units 13L and 13R are not fixed to the left fixing portion 16L and the right fixing portion 16R. A state in which the earphone units 13L and 13R are not fixed to the left fixing portion 16L and the right fixing portion 16R is referred to as “a binaural use state”. This use state is suitable for listening to music or the like, for example.

  In FIG. 2B, the earphone unit 13R is attached to the right ear ER of the user U, and the earphone unit 13L is fixed to the left fixing portion 16L. In other words, the earphone unit 13L is fixed to the left fixing portion 16L, and the earphone unit 13R is not fixed to the right fixing portion 16R. A state in which the earphone unit 13L is fixed to the left fixing portion 16L and the earphone unit 13R is not fixed to the right fixing portion 16R is referred to as a “right ear usage state”. In contrast to FIG. 2B, the state in which the earphone unit 13L is not fixed to the left fixing portion 16L and the earphone unit 13R is fixed to the right fixing portion 16R is referred to as a “left ear usage state”. This state of use is suitable, for example, when listening to external sound while listening to music or the like.

  In FIG. 2C, the earphone units 13L and 13R are not attached to the left and right ears EL and ER of the user U, the earphone unit 13L is fixed to the left fixing portion 16L, and the earphone unit 13R is fixed to the right fixing portion 16R. Has been. A state in which the earphone unit 13L is fixed to the left fixing portion 16L and the earphone unit 13R is fixed to the right fixing portion 16R is referred to as an “unused state”. This state of use is suitable, for example, when listening to external sound without listening to music or the like.

  As shown in FIGS. 2A, 2B and 2C, the stereo earphone device 100 of the present embodiment is not limited to “a binaural use state”, but a “left ear use state”, a “right ear use state”, and Even in the “unused state”, the ring-shaped appearance can be maintained without the earphone units 13L and 13R hanging down.

  FIG. 3 is a block diagram of the stereo earphone device 100. The signal processing unit 11 of the stereo earphone device 100 includes an audio control unit 21, a signal processing unit 22, a speaker driving unit 24, and a Bluetooth communication circuit 25.

  The voice control unit 21 is composed of a CPU 211 and a microcomputer provided with a memory 212 composed of ROM, RAM, and the like. The audio control unit 21 is connected to a signal processing unit 22, a Bluetooth communication circuit 25, a microphone 146, a left fixing unit sensor 161L, and a right fixing unit sensor 161R. The voice control unit 21 implements a voice control function by causing the CPU 211 to execute a control program stored in the memory 212 in advance. The sound control unit 21 receives the external sound collected by the microphone 146 and the Bluetooth communication circuit 25 from the signal processing unit 22 based on the detection signals from the left fixing unit sensor 161L and the right fixing unit sensor 161R. The processing content for the source sound input via is instructed.

  The Bluetooth communication circuit 25 has a function of transmitting and receiving a signal by wireless communication of Bluetooth standard. The Bluetooth communication circuit 25 receives a source sound from an audio player or the like. The source sound received via the Bluetooth communication circuit 25 is assumed to be a 2-channel stereo audio signal.

  The signal processing unit 22 adjusts (equalizes) the sound quality of the source sound input via the Bluetooth communication circuit 25 and / or the external sound collected by the microphone 146, and downmixes the source sound as necessary. Alternatively, external sound mixing with the source sound is performed, and the processed audio signal is output to the speaker driving unit 24. The speaker driving unit 24 has an amplifier, amplifies the audio signal input from the signal processing unit 22, and outputs the amplified signals to the speakers 144L and 144R, respectively.

  FIG. 4 is a functional block diagram of the stereo earphone device 100. The function of the stereo earphone device 100 will be described with reference to FIG.

  As shown in FIG. 4, the sound control unit 21 and the signal processing unit 22 of the stereo earphone device 100 function the wearing state determination unit 210, the output switching unit 212, and the external sound switching unit 216 in cooperation with the control program. In preparation.

  The wearing state determination unit 210 determines the usage state of the stereo earphone device 100 based on detection signals from the left fixing unit sensor 161L and the right fixing unit sensor 161R. Specifically, as described in the description of FIG. 2, the stereo earphone device 100 is in any of “both ear use state”, “left ear use state”, “right ear use state”, and “unused state”. It is determined whether or not

  When the detection signal is not input from both the left fixing unit sensor 161L and the right fixing unit sensor 161R, the wearing state determination unit 210 determines that the state is “both ear use state”. When the detection signal is input from the left fixing unit sensor 161L and the detection signal is not input from the right fixing unit sensor 161R, the wearing state determination unit 210 determines that the “right ear usage state” is set. On the other hand, when the detection signal is input from the right fixing unit sensor 161R and the detection signal is not input from the left fixing unit sensor 161L, the wearing state determination unit 210 determines that the “left ear usage state” is set. When detection signals are input from both the right fixing part sensor 161R and the left fixing part sensor 161L, the mounting state determination unit 210 determines that the state is “unused”.

  The output switching unit 212 switches the audio signal output to each of the earphone units 13L and 13R (speakers 144L and 144R) based on the determination result of the wearing state determination unit 210.

  Specifically, when the determination result of the wearing state determination unit 210 is “both ear usage state”, the output switching unit 212 outputs an audio signal to both the earphone units 13L and 13R (speakers 144L and 144R). In this case, the left channel source sound is output from the earphone unit 13L (speaker 144L), and the right channel source sound is output from the earphone unit 13R (speaker 144R).

  When the determination result of the wearing state determination unit 210 is “left ear usage state”, the output switching unit 212 outputs an audio signal to the earphone unit 13L (speaker 144L), and outputs the audio signal to the earphone unit 13R (speaker 144R). Stop output. In this case, the output switching unit 212 downmixes the input stereo (LR) audio signal into a monaural audio signal and outputs the monaural audio signal to the earphone unit 13L (speaker 144L). This is because, in the “left ear usage state”, the user U listens to the sound only with the left ear, that is, the earphone unit 13L (speaker 144L).

  When the determination result of the wearing state determination unit 210 is “right ear usage state”, the output switching unit 212 outputs an audio signal to the earphone unit 13R (speaker 144R) and outputs the audio signal to the earphone unit 13L (speaker 144L). Stop output. In this case, the output switching unit 212 downmixes the input stereo (LR) audio signal into a monaural audio signal and outputs the monaural audio signal to the earphone unit 13R (speaker 144R). This is because, in the “right ear usage state”, the user U listens to sound only with the right ear, that is, the earphone unit 13R (speaker 144R).

  When the determination result of the wearing state determination unit 210 is “unused state”, the output switching unit 212 stops outputting the audio signal to both the earphone units 13L and 13R (speakers 144L and 144R). This is because it is not necessary to emit sound from the earphone units 13L and 13R (speakers 144L and 144R) that are not attached to the ear of the user U in the “unused state”.

  In the “unused state”, a pause signal may be transmitted via Bluetooth to the audio player that transmits the source sound to pause the reproduction.

  The external sound switching unit 216 switches whether to mix the external sound signal with the source sound and output it to the earphone units 13L and 13R (speakers 144L and 144R) based on the determination result of the wearing state determination unit 210.

  Specifically, when the determination result of the wearing state determination unit 210 is “both ear use state”, the external sound switching unit 216 outputs an audio signal output to the earphone units 13L and 13R (speakers 144L and 144R) as an external sound signal. The audio signal is mixed with the source sound. This is because the earphone units 13L and 13R (speakers 144L and 144R) are attached to both ears of the user in the “both ear use state”, and external sounds are shielded and cannot be heard by the user. By outputting an audio signal obtained by mixing the source sound with the external sound signal, the external sound can be heard even when the earphone units 13L and 13R are attached to both ears.

  When the determination result of the wearing state determination unit 210 is “left ear usage state”, “right ear usage state” or “unused state”, the external sound switching unit 216 does not mix the external sound signal with the source sound. The audio signal output to the earphone unit 13L (speaker 144L) is only the source sound. This is because, in these use states, the earphone units 13L and 13R are not attached to either the left or right ear, and external sounds can be heard directly.

  FIG. 5 is a flowchart showing the operation of the stereo earphone device 100. This processing operation is repeatedly executed every short time (for example, 100 milliseconds). It is assumed that the Bluetooth communication circuit 25 receives a two-channel source sound, and the microphone 146 acquires a surrounding sound (external sound) and outputs a sound collection signal.

  When the operation of the stereo earphone device 100 starts, the wearing state determination unit 210 determines the usage state of the stereo earphone device 100 based on detection signals from the left fixing unit sensor 161L and the right fixing unit sensor 161R. First, the wearing state determination unit 210 determines whether or not a detection signal is input from the right fixing unit sensor 161R (S11). When the detection signal from the right fixing part sensor 161R is input (YES in S11), the wearing state determination unit 210 determines whether the detection signal from the left fixing part sensor 161L is input (S12). When the detection signal from the left fixing unit sensor 161L is not input (NO in S12), the wearing state determination unit 210 determines that the stereo earphone device 100 is in the “left ear usage state” (S13).

  If the detection signal from the right fixing part sensor 161R is not input in S11 (NO in S11), the mounting state determination unit 210 determines whether the detection signal from the left fixing part sensor 161L is input ( S16). When the detection signal from the left fixing unit sensor 161L is input (YES in S16), the wearing state determination unit 210 determines that the stereo earphone device 100 is in the “right ear usage state” (S17).

  If the detection signal from the left fixed part sensor 161L is not input in S16 (NO in S16), the wearing state determination unit 210 determines that the stereo earphone device 100 is in the “both ear use state” (S20). .

  On the other hand, when the detection signal from the left fixed portion sensor 161L is input in S12 (YES in S12), the wearing state determination unit 210 determines that the stereo earphone device 100 is “unused” (S23). ).

  When the determination result of the wearing state determination unit 210 is “both ear usage state” (S20), the external sound switching unit 216 mixes the external sound with the source sound (S21), and the earphone units 13L and 13R (speakers 144L). , 144R), audio signals are output (S22).

  When the determination result of the wearing state determination unit 210 is “left ear usage state” (S13), the output switching unit 212 downmixes the stereo source sound into a monaural signal (S14), and the left earphone unit 13L ( The data is output only to the speaker 144L) (S15). Note that the output of the audio signal to the earphone unit 13R (speaker 144R) is stopped, and the external sound switching unit 216 does not mix the external sound with the source sound.

  When the determination result of the wearing state determination unit 210 is “right ear usage state” (S17), the output switching unit 212 downmixes the stereo source sound into a monaural signal (S18), and the right earphone unit 13R ( Output only to the speaker 144R) (S19). Note that the output of the audio signal to the earphone unit 13L (speaker 144L) is stopped, and the external sound switching unit 216 does not mix the external sound with the source sound.

  When the determination result of the wearing state determination unit 210 is “unused state” (S23), the output switching unit 212 stops outputting audio signals to both the earphone units 13L and 13R (speakers 144L and 144R) (S24). ). If the audio player is receivable, a pause signal may be transmitted to the audio player via Bluetooth (S25). When a pause signal is transmitted to the audio player, if the usage state changes to “both ear usage state”, “left ear usage state” or “right ear usage state”, the audio player is To send a signal to resume playback.

  In the first embodiment described above, the left fixing part sensor 161L and the right fixing part sensor 161R that function as the mounting state detection part are configured by touch sensors, but the left fixing part sensor 161L and the right fixing part sensor 161R are configured. Is not limited to a touch sensor. For example, it is also possible to use a strain sensor that detects strain due to fixing of the cables 12L and 12R of the left and right fixing portions 16L and 16R. Further, the mounting state detection unit may be provided in addition to the left fixing unit 16L and the right fixing unit 16R. For example, a strain sensor that detects distortion of the earpiece due to the mounting of the earphone units 13L and 13R may be provided, and a motion sensor may be provided in the earphone units 13L and 13R. When the motion sensor is provided in the earphone units 13L and 13R, the vibration of the earphone unit when it is attached to the user's ear and the vibration of the earphone unit when it is away from the user's ear (non-attached state). By detecting a difference (detection of pendulum motion in a non-mounted state) with a motion sensor, the mounted state of the earphone units 13L and 13R can be detected. Moreover, you may provide a biosensor in the earphone units 13L and 13R. In this case, it is possible to detect whether or not the earphone units 13L and 13R are attached to the user's ear with a biosensor.

  Although the output switching unit 212 switches between outputting the audio signal and stopping the audio signal, the present invention is not limited to this. For example, instead of stopping the audio signal on the non-wearing side, the output of the audio signal may be lowered, or the output of the audio signal on the wearing side may be raised. In addition, a signal processing circuit may be provided to switch between signal processing for both ears and signal processing for one ear.

  The external sound switching unit 216 switches between an audio signal obtained by mixing an external sound signal and a source sound signal or only a source sound signal, but is not limited thereto. For example, the ratio of the external sound signal to the source sound signal may be changed.

[Embodiment 2]
In the stereo earphone device 100 according to the second embodiment, the positions of the branch portions 121A of the left cable 12L and the right cable 12R with respect to the ring 10A are different from the positions of the branch portions 121L and 121R of the first embodiment. The same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 6 is a front view of the stereo earphone device 100A according to the second embodiment. The left cable 12L and the right cable 12R are cables that connect the signal processing unit 11 and the earphone units 13L and 13R. The left cable 12L and the right cable 12R protrude from the inside of the ring 10A to the outside at the branch portion 121A, and branch outwardly with respect to the ring 10A. The branch portion 121A is located on the back side of the user with the ring 10A hung on the user's neck. For this reason, the branch part 121A, the left cable 12L, and the right cable 12R can be made inconspicuous from others in a state where the ring 10A is hung on the neck of the user. The branch part 121A

  The left fixing portion 16L and the right fixing portion 16R are provided on the ring 10A, respectively. The left fixing portion 16L is provided on the left portion of the ring 10 and can fix the earphone unit 13L. The right fixing portion 16R is provided on the right portion of the ring 10, and can fix the earphone unit 13R.

  The stereo earphone device of the present invention described above is not limited to the above embodiment. The signal processing unit 11 may be provided as hardware, but can also be realized as software by a CPU in an information processing apparatus such as a smartphone executing a predetermined program.

  The installation position of the microphone 146 may be other than the earphone units 13L and 13R. For example, the signal processing unit 11 or the ring 10 may be provided.

  The shapes of the ring 10, the attaching / detaching portion 101, and the lengths and thicknesses of the left cable 12L and the right cable 12R are not limited to those of the embodiment. Since these can also be elements that improve the decorativeness of the stereo earphone device, they can be changed to various structures and designs.

100, 100A Stereo earphone device 13L, 13R Earphone unit 21 Audio control unit 22 Signal processing unit 25 Bluetooth communication circuit 146 Microphone 16L Left fixing unit 16R Right fixing unit 161L Left fixing unit sensor (wearing state detection unit)
161R Right-side fixing part sensor (wearing state detection part)

Claims (8)

The left and right earphone units,
A source sound output unit that receives or plays back and outputs the source sound signal of the left and right channels;
A wearing state detection unit that detects a wearing state of each of the left and right earphone units by a user;
Based on the detection result of the wearing state detection unit, a signal processing unit that changes the mode of output of the source sound signal to the left and right earphone units;
Stereo earphone device with The signal processing unit selects an earphone unit that outputs sound from the left and right earphone units, or changes a volume output from the left and right earphone units based on a detection result of the wearing state detection unit. Item 3. The stereo earphone device according to Item 1. When the wearing state detection unit detects that one of the left and right earphone units is not worn, the signal processing unit outputs a signal obtained by downmixing the left and right channel audio signals to the other The stereo earphone device according to claim 1, wherein the stereo earphone device outputs to the earphone unit. When the wearing state detection unit detects that one or both of the left and right earphone units is not attached, the signal processing unit reduces the level of a signal output to the earphone unit that is not attached, The stereo earphone device according to any one of claims 1 to 3, wherein the signal is turned off. It is further equipped with a microphone that picks up external sounds,
The signal processing unit mixes the external sound with the source sound signal and switches the mixing on / off or changes the mixing ratio based on a detection result of the wearing state detection unit. The stereo earphone device according to any one of claims 1 to 4. When the wearing state detection unit detects that one of the left and right earphone units is not worn, the signal processing unit turns off the mixing or reduces the mixing ratio. The stereo earphone device according to claim 5. It further includes an annular mounting portion to be mounted on the user's neck
The left and right earphone units are respectively connected to left and right cables extending from the mounting portion,
The stereo earphone device according to any one of claims 1 to 6, wherein the mounting unit includes left and right fixing units to which the left and right earphone units or the left and right cables are respectively fixed. The wearing state detection unit includes a sensor that detects that the earphone unit or the cable is fixed to the fixing unit, and the sensor detects that the earphone unit or the cable is fixed to the fixing unit. The stereo earphone device according to claim 7, wherein it is determined that the earphone unit or the earphone unit connected to the cable is not attached.

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