JP6753063B2 - Stereo earphone device - Google Patents

Description

The present invention relates to a stereo earphone device that changes an output sound according to a state of being worn by a user.

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

JP-A-2007-183920

However, when only one of the right ear earphone and the left ear earphone is attached to one ear and used, the user cannot hear the sound output from the other earphone that is not attached to the ear. Therefore, when different sounds are output for the right channel and the left channel like a stereo signal, the user cannot hear the sound output from the earphone that is not worn on the ear.

Even if the earphones are not worn on the ears, sound continues to be emitted from the earphones. For this reason, the sound emitted from the earphones that are not worn on the ears becomes noise to the surroundings.

An object of the present invention is to provide a stereo earphone device that changes an output sound according to a state of being worn by a user.

The stereo earphone device provided by the first aspect of the present invention includes left and right earphone units, a microphone that collects external sound, and a source sound output unit that receives or reproduces and outputs the source sound signals of the left and right channels. , The mounting state detection unit that detects the wearing state of each of the left and right earphone units by the user, and the external sound that is mixed with the source sound signal, and based on the detection result of the mounting state detection unit, the said It is characterized by including a signal processing unit for switching on / off of mixing or changing the mixing ratio .

In the above invention, when the wearing state detection unit detects that one of the left and right earphone units is not mounted, 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 of the left and right earphone units is not mounted, the signal processing unit turns off the mixing or mixes. You may reduce the ratio of.

In the above invention, the ring-shaped mounting portion to be mounted on the user's neck is further provided, 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 the left and right earphones. It may have left and right fixing portions to which the unit or the left and right cables are fixed, respectively.

In the above invention, the wearing state detection unit includes a sensor that detects that the earphone unit or cable is fixed to the fixed portion, and the sensor is such that the earphone unit or cable is fixed to the fixed portion. When the above is detected, it may be determined that the earphone unit or the earphone unit connected to the cable is not attached.

According to the present invention, the stereo earphone device can change the output sound according to the state of being worn by the user.

It is a front view of the stereo earphone apparatus which concerns on Embodiment 1 to which this invention is applied. It is a front view which shows the state which a user is using a stereo earphone device. 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 the operation of a stereo earphone device. It is a front view of the stereo earphone device which concerns on Embodiment 2. FIG.

[Embodiment 1]
FIG. 1 is a front view of the stereo earphone device 100 according to the 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 figure below, the arrow R indicates the right direction of the stereo earphone device 100, and the arrow L indicates the left direction. The arrow U indicates an upward direction, and the arrow D indicates a downward direction. The arrow F indicates the forward direction, and the arrow B indicates the backward direction.

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

The ring 10 can be separated and joined by the detachable portion 101. The detachable portion 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 attach the ring 10 to the user. Can be worn around the neck. In the present embodiment, the ring 10 is attached so that the detachable portion 101 is located in front of the user's neck. The attachment / detachment portion 101 may be attached so as to be located behind or to the side of the user's neck. The shape and structure of the detachable 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 into 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 for which Bluetooth communication has been established. The audio signal input from the Bluetooth communication unit 25 is subjected to voice processing such as sound quality adjustment by the signal processing unit 11, and is output from the earphone units 13L and 13R. An audio jack or the like may be provided instead of the Bluetooth communication unit so that it can be connected to another audio player by wire.

The left cable 12L and the right cable 12R are cables for connecting 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 are connected to the signal processing unit 11. The left cable 12L extends from the inside of the ring 10 to the outside at the left branch portion 121L, and is apparently branched from the ring 10. The right cable 12R protrudes from the inside of the ring 10 to the outside at the right branch portion 121R, and is apparently branched from the ring 10. In the present embodiment, the left branch portion 121L is arranged on the left portion of the ring 10, and the right branch portion 121R is arranged on the right portion of the ring 10. Therefore, the user can easily perform the operation of pinching the left cable 12L and the right cable 12R with the right hand or the left hand and attaching the earphone units 13L and 13R to the ear.

The earphone units 13L and 13R are canal type earphones. The earphone unit 13L is attached to the end opposite to the left branch portion 121L of the left cable 12L. The earphone unit 13R is attached to the end opposite to the right branch portion 121R of the right cable 12R. 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 pick-up signal. The sound pick-up signal is voice-processed by the signal processing unit 11 and output from the earphone units 13L and 13R. When the earphone units 13L and 13R are worn by the user, they transmit the external sound picked up by the microphone 146 and the sound based on the audio signal from the audio player to the user.

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 of sandwiching and fixing the earphone units 13L and 13R, or a structure of fixing with 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. As the left fixed portion sensor 161L and the right fixed portion sensor 161R, for example, a touch sensor can be used. 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 a detection signal. 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 has the earphone unit 13R on the right. Detects that it is fixed to the fixing unit 16R. As a result, it is possible to detect that the earphone unit 13R is not attached to the user's ear. The left fixing unit sensor 161L and the right fixing unit sensor 161R correspond to the mounting state detection unit of the present invention.

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

In FIG. 2A, earphone units 13L and 13R are attached to the left and right ear ELs and ERs 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. The 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 “both ear use state”. This usage 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. The 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 use state". Contrary to FIG. 2B, a 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 used state”. This usage state is suitable for listening to external voice while listening to music or the like, for example.

In FIG. 2C, the earphone units 13L and 13R are not attached to the left and right ear ELs and ERs 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 done. The 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 defined as an "unused state". This usage state is suitable, for example, when listening to an external voice without listening to music or the like.

As shown in FIGS. 2A, 2B and 2C, the stereo earphone device 100 of the present embodiment includes not only the "binaural use state" but also the "left ear use state", the "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 a voice control unit 21, a signal processing unit 22, a speaker drive 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 including a ROM, a RAM, and the like. A signal processing unit 22, a Bluetooth communication circuit 25, a microphone 146, a left fixed unit sensor 161L, and a right fixed unit sensor 161R are connected to the voice control unit 21. The voice control unit 21 realizes the voice control function by executing the control program stored in the memory 212 in advance by the CPU 211. The voice control unit 21 refers to the signal processing unit 22 with respect to the external sound picked up by the microphone 146 and the Bluetooth communication circuit 25 based on the detection signals from the left fixed unit sensor 161L and the right fixed unit sensor 161R. Instructs the processing content for the source sound input via.

The Bluetooth communication circuit 25 has a function of transmitting a signal and a function of receiving a signal by wireless communication of the Bluetooth standard. The Bluetooth communication circuit 25 receives the source sound from an audio player or the like. It is assumed that the source sound received via the Bluetooth communication circuit 25 is 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 picked up 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 drive unit 24. The speaker drive unit 24 has an amplifier, amplifies the audio signal input from the signal processing unit 22, and outputs the amplified signal 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 voice 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. Be prepared for.

The wearing state determination unit 210 determines the usage state of the stereo earphone device 100 based on the detection signals from the left fixed unit sensor 161L and the right fixed unit sensor 161R. Specifically, as described in the description of FIG. 2, the stereo earphone device 100 is in any of "both ears used state", "left ear used state", "right ear used state", and "unused state". Judge whether it is in the state of.

When the detection signal is not input from both the left fixed unit sensor 161L and the right fixed unit sensor 161R, the wearing state determination unit 210 determines that the device is in the “both ears used state”. When the detection signal is input from the left fixed unit sensor 161L and the detection signal is not input from the right fixed unit sensor 161R, the wearing state determination unit 210 determines that the right ear is in use. On the contrary, when the detection signal is input from the right fixed unit sensor 161R and the detection signal is not input from the left fixed unit sensor 161L, the wearing state determination unit 210 determines that the left ear is in use. When the detection signal is input from both the right fixed portion sensor 161R and the left fixed portion sensor 161L, the mounting state determination unit 210 determines that the device is in an “unused state”.

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 ears used 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 "the left ear is in use", 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 the output. In this case, the output switching unit 212 downmixes the input stereo (LR) audio signal into a monaural audio signal and outputs it to the earphone unit 13L (speaker 144L). This is because in the "left ear use 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 use 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 the output. In this case, the output switching unit 212 downmixes the input stereo (LR) audio signal into a monaural audio signal and outputs it to the earphone unit 13R (speaker 144R). This is because in the "right ear use state", the user U listens to the 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 the output of the audio signal to both the earphone units 13L and 13R (speakers 144L and 144R). This is because, in the "unused state", it is not necessary to emit sound from the earphone units 13L, 13R (speakers 144L, 144R) that are not attached to the ears of the user U.

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

The external sound switching unit 216 switches whether or not 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 mounting state determination unit 210.

Specifically, when the determination result of the wearing state determination unit 210 is "both ears used state", the external sound switching unit 216 outputs an audio signal output to the earphone units 13L, 13R (speakers 144L, 144R) as an external sound signal. The audio signal is a mixture of 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 "binaural use state", and the external sound is blocked and cannot be heard by the user. By outputting the 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 used state", "right ear used 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 the earphone units 13L and 13R are not attached to either the left or right ear in these usage states, and the external sound 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 the source sound of two channels, and the microphone 146 acquires the ambient sound (external sound) and outputs the pick-up signal.

When the operation of the stereo earphone device 100 starts, the mounting state determination unit 210 determines the usage state of the stereo earphone device 100 based on the detection signals from the left fixed unit sensor 161L and the right fixed unit sensor 161R. First, the mounting state determination unit 210 determines whether or not the detection signal from the right fixed unit sensor 161R is input (S11). When the detection signal from the right fixed unit sensor 161R is input (YES in S11), the mounting state determination unit 210 determines whether or not the detection signal from the left fixed unit sensor 161L is input (S12). When the detection signal from the left fixed 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 use state” (S13).

When the detection signal from the right fixed unit sensor 161R is not input in S11 (NO in S11), the mounting state determination unit 210 determines whether or not the detection signal from the left fixed unit sensor 161L is input (NO). S16). When the detection signal from the left fixed 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 use state” (S17).

When the detection signal from the left fixed unit 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 ears used state" (S20). ..

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

When the determination result of the wearing state determination unit 210 is "both ears used state" (S20), the external sound switching unit 216 mixes the external sound with the source sound (S21), and the earphone units 13L and 13R (speaker 144L). , 144R), an audio signal is output (S22).

When the determination result of the wearing state determination unit 210 is "the left ear is in use" (S13), the output switching unit 212 downmixes the stereo source sound into a monaural signal (S14), and the left earphone unit 13L (S13). Output only to the speaker 144L) (S15). 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 use state" (S17), the output switching unit 212 downmixes the stereo source sound into a monaural signal (S18), and the right earphone unit 13R (S17). It outputs only to the speaker 144R) (S19). 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 mounting state determination unit 210 is "unused state" (S23), the output switching unit 212 stops the output of the audio signal to both the earphone units 13L and 13R (speakers 144L and 144R) (S24). ). Then, if the audio player can receive the pause signal, the 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 ears used", "left ear used" or "right ear used" after that, the audio player is notified. And sends a signal instructing to resume playback.

In the first embodiment described above, the left fixing unit sensor 161L and the right fixing unit sensor 161R that function as the mounting state detection unit are composed of touch sensors, but the left fixing unit sensor 161L and the right fixing unit sensor 161R are used. Is not limited to touch sensors. For example, it is also possible to use a strain sensor that detects distortion due to fixing of cables 12L and 12R of fixing portions 16L and 16R for left and right. Further, the mounting state detection unit may be provided in addition to the left fixing portion 16L and the right fixing portion 16R. For example, a strain sensor that detects distortion of the earpiece due to the attachment of the earphone units 13L and 13R may be provided, or a motion sensor may be provided on the earphone units 13L and 13R. When motion sensors are provided on 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). It is possible to detect the wearing state of the earphone units 13L and 13R by detecting the difference (detection of the pendulum movement in the non-wearing state) with the motion sensor. Further, the biosensor may be provided in the earphone units 13L and 13R. In this case, it is possible to detect with the biosensor whether or not the earphone units 13L and 13R are attached to the user's ear.

The output switching unit 212 switches between the output of the voice signal and the stop of the voice signal, but 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 voice signal on the wearing side may be increased. Further, a signal processing circuit may be provided to switch between signal processing in the case of both ears and signal processing in the case of one ear.

The external sound switching unit 216 switches whether the external sound signal and the source sound signal are mixed as an audio signal or only the source sound signal, but the present invention is not limited to this. 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 designated by the same reference numerals, and detailed description thereof will be 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 for connecting the signal processing unit 11 and the earphone units 13L and 13R. The left cable 12L and the right cable 12R are branched from the inside of the ring 10A to the outside at the branch portion 121A, and are apparently branched from 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. Therefore, the branch portion 121A, the left cable 12L, and the right cable 12R can be made inconspicuous from others while the ring 10A is hung on the user's neck. The branch portion 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 it can also be realized as software when a CPU in an information processing device such as a smartphone executes a predetermined program.

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

The shapes of the ring 10, the detachable portion 101, and the like, and the length and thickness 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 Voice 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 (mounting state detection unit)
161R Right fixed part sensor (mounting state detection part)

Claims (5)

Left and right earphone units and
A microphone that collects external sound and
A source sound output section that receives or plays back the source sound signals of the left and right channels and outputs them.
A wearing state detection unit that detects the wearing state of each of the left and right earphone units by the user,
A signal processing unit that mixes the external sound with the source sound signal, switches the mixing on / off based on the detection result of the mounting state detection unit , or changes the mixing ratio .
Stereo earphone device equipped with. When the wearing state detection unit detects that one of the left and right earphone units is not mounted, the signal processing unit downmixes the audio signals of the left and right channels to the other. The stereo earphone device according to claim 1, which outputs to the earphone unit of the above. When the wearing state detection unit detects that one of the left and right earphone units is not mounted, the signal processing unit turns off the mixing or reduces the mixing ratio. The stereo earphone device according to claim 1 or 2 . It also has an annular mounting part that can be worn around the user's neck.
The left and right earphone units are connected to the left and right cables extending from the mounting portion, respectively.
The mounting portion, the stereo earphone device according to any one of claims 1 to 3 having a right and left fixing portion to which the left and right earphone units or the right and left cable are fixed respectively. The wearing state detecting unit includes a sensor that detects that the earphone unit or cable is fixed to the fixed portion, and when the sensor detects that the earphone unit or cable is fixed to the fixed portion. The stereo earphone device according to claim 4, wherein it is determined that the earphone unit or the earphone unit connected to the cable is not attached.

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