Patent Description:
In a vehicle interior, an accessory having a drive mechanism configured to operate by driving a motor, a gear, and the like may be installed. Examples of the accessory include a head-up display (HUD) device. The HUD device causes visible light emitted from a liquid crystal display (LCD) to be reflected by a reflecting mirror, and then projects the reflected visible light on a display panel of the HUD device, a windshield external to the HUD device, and the like such that an occupant in the vehicle interior can visually recognize the visible light as an image. The HUD device as described above includes a drive mechanism configured to drive the reflecting mirror, the display panel, and the like.

In the accessory such as the HUD device described above, an operating sound of the drive mechanism may give discomfort and a strange feeling to the occupant in the vehicle interior. Examples of the operating sound of the drive mechanism that may give discomfort and a strange feeling to the occupant include motor sounds and engagement sounds of gears. Therefore, various vehicle-interior sound-adjustment apparatuses have been proposed in order to suppress such an operating sound of the drive mechanism being heard by the occupant. One example of the vehicle-interior sound-adjustment apparatus is an HUD device having a Helmholtz resonator (for example, see Patent Literature <NUM>).

However, the Helmholtz resonator used in the one example of the vehicle-interior sound-adjustment apparatus described above can merely suppress the operating sound of the accessory having a peak of the sound pressure level in a predefined fixed resonance frequency. However, the resonance frequency of the operating sound generated in the accessory such as the HUD device may change due to the temperature environment around the accessory, degradation of the accessory over time, and the like. Therefore, in the one example of the vehicle-interior sound-adjustment apparatus, it is impossible to efficiently suppress the operating sound of the accessory being heard by the occupant in a case in which the operating sound of the accessory changes, for example.

In view of the situation as above, it is desirable to provide a vehicle-interior sound-adjustment apparatus in which an operating sound of an accessory being heard by an occupant is efficiently suppressed while also suppressing discomfort and a strange feeling of the occupant.

<CIT> discloses a noise masking method that synchronizes ON/OFF operation of a system main relay of a motor drive system with operation of other regions in a hybrid vehicle and/or electric vehicle, shields the operation sound of the system main relay by the operation sound of the other regions and makes it hardly heard by the passengers. The operation of the other regions is preferably the opening/closing operation of a door lock and/or a door.

<CIT> discloses a control unit for controlling at least one loudspeaker in a motor vehicle, having an acoustic control module which has an output interface for coupling to a loudspeaker and which is designed to detect an adjustment of the vehicle assembly and, in the event of a detected adjustment of the vehicle assembly, to generate such a noise control signal that, when the loudspeaker is actuated using the noise control signal, an acoustic concealment signal is generated which at least partially overlaps a noise generated by the adjustment of the vehicle assembly.

The scope of the present invention is defined by the appended claim.

In the vehicle-interior sound-adjustment apparatus according to one aspect, it is possible to efficiently suppress the operating sound of the accessory being heard by an occupant while suppressing discomfort and a strange feeling of the occupant.

A vehicle-interior sound-adjustment apparatus according to an embodiment is described together with a vehicle in which the vehicle-interior sound-adjustment apparatus is mounted. The vehicle in which the vehicle-interior sound-adjustment apparatus according to the embodiment is mounted is an automobile having a vehicle interior space. However, the vehicle can be a vehicle other than the automobile having a vehicle interior space.

In <FIG> and <FIG> used for explanation in the present specification, directions based on the vehicle <NUM> are indicated as follows. In <FIG> and <FIG>, a vehicle front side and a vehicle rear side are indicated by a one-headed arrow F and a one-headed arrow B, respectively. In <FIG>, a left side and a right side when facing the vehicle front side are indicated by a one-headed arrow L and a one-headed arrow R, respectively. A vehicle width direction is indicated by the one-headed arrow L and the one-headed arrow R. In <FIG>, a vehicle upper side and a vehicle lower side are indicated by a one-headed arrow U and a one-headed arrow D, respectively. In the following description, directions simply referred to as a "front side", a "rear side", a "left side", a "right side", an "upper side", a "lower side", a "front-rear direction", a "width direction", and an "up-down direction" indicate directions with reference to the vehicle <NUM>.

Outline of Vehicle-Interior Sound-Adjustment Apparatus and Vehicle.

An outline of a vehicle-interior sound-adjustment apparatus <NUM> and a vehicle <NUM> according to the embodiment is described with reference to <FIG>. The vehicle-interior sound-adjustment apparatus <NUM> and the vehicle <NUM> according to the embodiment are generally configured as follows. Referring to <FIG>, the vehicle-interior sound-adjustment apparatus <NUM> is configured to be able to suppress or reduce an operating sound of an accessory <NUM> provided in a vehicle interior <NUM> of the vehicle <NUM> being heard by an occupant in the vehicle interior <NUM>.

Referring to <FIG> and <FIG>, the accessory <NUM> provided in the vehicle interior <NUM> of the vehicle <NUM> according to the embodiment has a drive mechanism <NUM> configured to operate by driving a motor, a gear, and the like. In the embodiment, the accessory <NUM> is a head-up display (HUD) device <NUM> as one example. However, the accessory is not limited to the HUD device. For example, the accessory can also be an electric tilt and telescopic steering, an electric power seat, or an automotive navigation system with a drivable display.

As illustrated in <FIG> and <FIG>, the vehicle-interior sound-adjustment apparatus <NUM> includes a sound output unit <NUM> configured to output sound to the vehicle interior <NUM>. As illustrated in <FIG>, the vehicle-interior sound-adjustment apparatus <NUM> includes a masking sound generation unit <NUM> configured to generate a masking sound for masking the operating sound of the HUD device <NUM>. The vehicle-interior sound-adjustment apparatus <NUM> includes a startup sound generation unit <NUM> configured to generate a startup sound emitted at the time of startup of the vehicle <NUM>. The vehicle-interior sound-adjustment apparatus <NUM> includes a control unit <NUM> configured to cause the startup sound generated by the startup sound generation unit <NUM> to be output from the sound output unit <NUM>.

As illustrated in <FIG>, in the vehicle-interior sound-adjustment apparatus <NUM>, the startup sound generation unit <NUM> is configured to be able to generate a first startup sound and a second startup sound. The first startup sound is composed of a first sound. The second startup sound is composed of a second sound, which is a sound of a higher frequency or pitch than the first sound, and the masking sound generated by the masking sound generation unit <NUM>.

In <FIG>, a horizontal axis X indicates a sound range or a frequency (kHz). A sound range of the first sound, in other words, a frequency band in which a sound pressure level (dB) of the first sound is higher than in other frequency ranges is indicated by a double-headed arrow P1. A sound range of the second sound, in other words, a frequency band in which a sound pressure level of the second sound is higher than in other frequency ranges is indicated by a double-headed arrow P2. A sound range of the masking sound, in other words, a frequency band in which a sound pressure level of the masking sound is higher than in other frequency ranges is indicated by a double-headed arrow Q. A sound range of the operating sound of the HUD device <NUM>, in other words, a frequency band in which a sound pressure level of the operating sound of the HUD device <NUM> is higher than that of other frequency ranges is indicated by a double-headed arrow M.

As illustrated in <FIG>, the control unit <NUM> is configured to cause the first startup sound generated by the startup sound generation unit <NUM> to be output from the sound output unit <NUM> in a state in which the HUD device <NUM> is set so as not to activate an operation that emits an operating sound (hereinafter referred to as a "non-operation setting state" as necessary). As illustrated in <FIG>, the control unit <NUM> is configured to cause the second startup sound generated by the startup sound generation unit <NUM> to be output from the sound output unit <NUM> in a state in which the HUD device <NUM> is set to perform an operation that emits an operating sound (hereinafter referred to as an "operation setting state" as necessary).

In the vehicle-interior sound-adjustment apparatus <NUM>, the masking sound generation unit <NUM> can be configured to adjust the frequency at the peak of the sound pressure level of the masking sound in accordance with the cumulative number of operations of the HUD device <NUM>.

Referring to <FIG>, the vehicle <NUM> can be configured in detail as follows. The vehicle <NUM> includes an instrument panel <NUM> disposed at the front side of the vehicle interior <NUM> of the vehicle <NUM>. The vehicle <NUM> includes a driver's seat 4a and a passenger seat 4b disposed on the rear side with respect to the instrument panel <NUM>. The driver's seat 4a and the passenger seat 4b are disposed side by side in the vehicle width direction. The driver's seat 4a and the passenger seat 4b form a front-row seat group <NUM>.

The vehicle <NUM> includes at least one rear-row seat group <NUM> disposed on the rear side with respect to the front-row seat group <NUM>. The rear-row seat group <NUM> is formed of a plurality of rear seats 5a and 5b. In <FIG>, the vehicle <NUM> includes one rear-row seat group <NUM> formed of two rear seats 5a and 5b. However, the vehicle can include one rear-row seat group formed of three or more rear seats. The vehicle can also be formed of two or more rear-row seat groups formed of a plurality of rear seats and spaced apart from each other in the front-rear direction.

An occupant who is a driver (not illustrated) of the vehicle <NUM> sits on the driver's seat 4a. An occupant (not illustrated) other than the driver of the vehicle <NUM> sits on any of the passenger seat 4b and the plurality of rear seats 5a and 5b. The vehicle <NUM> includes an ignition switch (hereinafter referred to as an "IG switch" as necessary) <NUM> for starting up the vehicle <NUM>. When the occupant such as the driver places the IG switch <NUM> in an ON state, a driving source such as an engine, a travel driving motor, or the like starts up. When the occupant such as the driver places the IG switch <NUM> in an OFF state, the driving source and the like stop.

Referring to <FIG>, the HUD device <NUM> can be configured in detail as follows. As illustrated in <FIG>, the HUD device <NUM> is disposed on an upper surface portion 3a of the instrument panel <NUM> close to the driver's seat 4a in the vehicle width direction. As illustrated in <FIG> and <FIG>, the HUD device <NUM> includes a display panel <NUM> configured to be movable in the up-down direction between a deployed state and a stored state. In <FIG>, the display panel <NUM> in the deployed state is indicated by a solid line, and the display panel <NUM> in the stored state is indicated by a virtual line.

As illustrated in <FIG>, the display panel <NUM> is configured to be able to reflect light while being able to transmit light. The display panel <NUM> in the deployed state is disposed so as to face the driver's seat 4a in the front-rear direction. The driver can visually recognize a display projected on the display panel <NUM> in the deployed state while visually recognizing scenery located behind the display panel <NUM> in the deployed state.

The HUD device <NUM> includes a liquid crystal display (LCD) <NUM> configured to be able to forms a display image projected on the display panel <NUM>. The HUD device <NUM> includes a reflecting mirror <NUM> configured to reflect the display image from the LCD <NUM> toward the display panel <NUM>. In the HUD device <NUM>, a projection path (indicated by a one-headed arrow K in <FIG>) heading toward the display panel <NUM> from the LCD <NUM> via the reflecting mirror <NUM> is formed.

The HUD device <NUM> includes a casing <NUM> that houses the display panel <NUM> in the stored state, the LCD <NUM>, and the reflecting mirror <NUM>. The casing <NUM> has an opening 25a formed in an upper portion of the casing <NUM> such that the display panel <NUM> and the projection path can pass therethrough.

The drive mechanism <NUM> of the HUD device <NUM> includes a motor 21a, and a leadscrew 21b that is turnable by driving of the motor 21a. As shown by a double-headed arrow H (illustrated in <FIG>), the display panel <NUM> moves in the up-down direction between the deployed state and the stored state in accordance with turning of the leadscrew 21b.

The operating sound of the HUD device <NUM> is generated by the driving of the motor 21a of the drive mechanism <NUM>, the turning of the leadscrew 21b of the drive mechanism <NUM>, and the like. The drive mechanism can also be configured to be able to adjust an angle of reflection at the reflecting mirror by a motor, a gear, and the like. In this case, an operating sound may be generated when the angle of reflection at the reflecting mirror is adjusted.

An operation of the HUD device <NUM> is a deploying operation that moves the display panel <NUM> from the stored state to the deployed state. The HUD device <NUM> includes an operation switching unit <NUM> configured to perform switching between the non-operation setting state and the operation setting state. In the operation setting state, the HUD device <NUM> starts an operation that emits an operating sound at the same time as the IG switch <NUM> is switched to the ON state from the OFF state or after a predetermined amount of time elapses from the switching to the ON state.

Specifically, in the operation setting state, the HUD device <NUM> starts the deploying operation of the display panel <NUM> at the same time as the IG switch <NUM> is switched to the ON state from the OFF state or after a predetermined amount of time elapses from the switching to the ON state. The HUD device <NUM> ends the deploying operation when the display panel <NUM> is placed in the deployed state. However, the HUD device can also start the deploying operation of the display panel at the same time as the occupant such as the driver performs operation of switching the operation switching unit from the non-operation setting state to the operation setting state after the IG switch <NUM> is switched to the ON state from the OFF state.

Details of Vehicle-Interior Sound-Adjustment Apparatus <NUM>.

Referring to <FIG>, <FIG>, and <FIG> to <FIG>, the vehicle-interior sound-adjustment apparatus <NUM> according to the embodiment can be configured in detail as follows. As illustrated in <FIG> and <FIG>, the sound output unit <NUM> of the vehicle-interior sound-adjustment apparatus <NUM> includes a plurality of speakers 11a, 11b, 11c, and 11d.

Specifically, as illustrated in <FIG>, the sound output unit <NUM> can include the first speaker 11a located on the outer side with respect to the driver's seat 4a in the vehicle width direction. The sound output unit <NUM> can include the second speaker 11b located on the outer side with respect to the passenger seat 4b in the vehicle width direction. The sound output unit <NUM> can include the third speaker 11c located on one side with respect to the rear-row seat group <NUM> in the vehicle width direction. The sound output unit <NUM> can include the fourth speaker 11d located on the other side with respect to the rear-row seat group <NUM> in the vehicle width direction.

The masking sound generation unit <NUM>, the startup sound generation unit <NUM>, and the control unit <NUM> of the vehicle-interior sound-adjustment apparatus <NUM> can each be configured to include electronic components such as a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), a flash memory, an input interface, and an output interface, and an electric circuit in which the electronic components are disposed. The ROM can store various control constants, various maps, programs for executing various controls, and the like therein.

As illustrated in <FIG>, for example, one electric control unit (ECU) <NUM> can include the masking sound generation unit <NUM>, the startup sound generation unit <NUM>, and the control unit <NUM> of the vehicle-interior sound-adjustment apparatus <NUM>. However, the masking sound generation unit, the startup sound generation unit, and the control unit are not limited to the above. The masking sound generation unit, the startup sound generation unit, and the control unit can be included in different ECUs. One of the masking sound generation unit, the startup sound generation unit, and the control unit can also be included in an ECU different from an ECU including the rest of the units.

The masking sound generation unit <NUM> is configured to be able to count the cumulative number of operations of the HUD device <NUM>. The masking sound generation unit <NUM> is configured to be able to store the cumulative number of operations of the HUD device <NUM> therein. The masking sound generation unit <NUM> is configured to count the cumulative number of operations of the HUD device <NUM> by incrementing a cumulative number N of operations of the HUD device <NUM> stored in a previous operation by <NUM> every time the HUD device <NUM> operates, and to store the cumulative number therein. The masking sound generation unit <NUM> is configured to repeat the counting and storage as above at the time of the operation of the HUD device <NUM>.

Referring to <FIG>, the startup sound generation unit <NUM> is configured to be able to generate a second preliminary startup sound composed of the second sound. In the relationship between the first sound in the first startup sound generated by the startup sound generation unit <NUM> and the second sound in the second startup sound generated by the startup sound generation unit <NUM>, the sound range of the second sound has higher frequencies than those of the sound range of the first sound. Therefore, the second sound is captured by an ear of the occupant such as the driver more easily than the first sound. It is preferred that the sound pressure level in the sound range of the second sound be greater than the sound pressure level in the sound range of the first sound.

The sound range of the operating sound of the HUD device <NUM> is substantially equal to the sound range of the masking sound. The sound range of the second sound includes the sound range of the operating sound of the HUD device <NUM> and the sound range of the masking sound. In other words, the sound range of the operating sound of the HUD device <NUM> and the sound range of the masking sound are within the sound range of the second sound. It is preferred that the sound pressure level in the sound range of the masking sound be greater than the sound pressure level in the sound range of the operating sound of the HUD device <NUM>.

Each of the first and second sounds can be music. In other words, the first sound can be first music, and the second sound can be second music. Here, music is defined as something including rhythm, melody, and harmony.

Referring to <FIG>, <FIG>, the control unit <NUM> is configured to be able to determine whether the IG switch <NUM> is switched to the ON state from the OFF state. The control unit <NUM> is configured to be able to determine whether the HUD device <NUM> is in the operation setting state when the IG switch <NUM> is switched to the ON state from the OFF state. The control unit <NUM> is configured to cause the first startup sound to be output from the sound output unit <NUM> at the same time as the IG switch <NUM> is switched from the OFF state to the ON state or after a predetermined amount of time elapses from the switching to the ON state when the HUD device <NUM> is not in the operation setting state, in other words, when the HUD device <NUM> is in the non-operation setting state.

The control unit <NUM> is configured to cause the second startup sound to be output from the sound output unit <NUM> in a state in which the HUD device <NUM> is in the operation setting state and is operating in a manner of emitting an operating sound after the IG switch <NUM> is switched to the ON state from the OFF state. The control unit <NUM> is configured to end the output of the second startup sound from the sound output unit <NUM> at the same time as the operation of the HUD device <NUM> ends, in particular, the deploying operation of the display panel <NUM> ends or after a predetermined amount of time elapses from the end of the operation.

The control unit <NUM> can cause the second preliminary startup sound to be output from the sound output unit <NUM> between a timing at which the IG switch <NUM> is switched to the ON state from the OFF state and a timing at which the operation of the HUD device <NUM> starts. The control unit <NUM> can also cause the second preliminary startup sound to be output from the sound output unit <NUM> from when the operation of the HUD device <NUM> ends, in particular, when the deploying operation of the display panel <NUM> ends until a predetermined amount of time elapses.

Sound Adjustment Method Executed by Vehicle-Interior Sound-Adjustment Apparatus.

Referring to <FIG>, a sound adjustment method executed by the vehicle-interior sound-adjustment apparatus <NUM> according to the embodiment is described. First, the IG switch <NUM> is in the OFF state (Step S <NUM>). It is determined whether the IG switch <NUM> is switched to the ON state from the OFF state (Step S2). When the IG switch <NUM> is not switched to the ON state from the OFF state (NO), Step S2 is executed again.

When the IG switch <NUM> is switched to the ON state from the OFF state (YES), it is determined whether the HUD device <NUM> is in the operation setting state (Step S3). When the HUD device <NUM> is not in the operation setting state (NO), in other words, when the HUD device <NUM> is in the non-operation setting state, the first startup sound is output from the sound output unit <NUM> (Step S4).

When the HUD device <NUM> is in the operation setting state (YES), <NUM> is added to the cumulative number N of operations of the HUD device <NUM> stored in the previous operation of the HUD device <NUM>, and a latest cumulative number (N+<NUM>) of operations of the HUD device <NUM> is obtained as a result (Step S5). The masking sound is corrected or adjusted so as to change the frequency at the peak of the sound pressure level of the masking sound in accordance with the latest cumulative number (N+<NUM>) of operations of the HUD device <NUM> (Step S6).

At this time, the masking sound is adjusted so as to respond to degradation over time associated with the increase of the cumulative number of operations of the HUD device <NUM>. The relationship between the increase of the cumulative number of operations of the HUD device <NUM> and the aging degradation can be predefined by experiments, usage results, simulations, and the like. Then, the second startup sound composed of the second sound having a higher frequency than the first sound, and the masking sound, which has been corrected in Step S5, is output from the sound output unit <NUM> (Step S7).

As described above, the vehicle-interior sound-adjustment apparatus <NUM> according to the embodiment is the vehicle-interior sound-adjustment apparatus <NUM> configured to be able to suppress the operating sound of the accessory <NUM> provided in the vehicle interior <NUM> of the vehicle <NUM> being heard by the occupant in the vehicle interior <NUM>. The vehicle-interior sound-adjustment apparatus <NUM> includes: the sound output unit <NUM> configured to be able to output a sound to the vehicle interior <NUM>; the masking sound generation unit <NUM> configured to be able to generate the masking sound for masking the operating sound of the accessory <NUM>; the startup sound generation unit <NUM> configured to be able to generate the startup sound emitted at the time of startup of the vehicle <NUM>; and the control unit <NUM> configured to cause the startup sound generated by the startup sound generation unit <NUM> to be output from the sound output unit <NUM>. In the vehicle-interior sound-adjustment apparatus <NUM>, the startup sound generation unit <NUM> is configured to be able to generate the first startup sound composed of the first sound, and the second startup sound composed of the second sound having a higher frequency than the first sound, and the masking sound generated by the masking sound generation unit <NUM>, and the control unit <NUM> is configured to cause the first startup sound generated by the startup sound generation unit <NUM> to be output from the sound output unit <NUM> in a state in which the accessory <NUM> is set so as not to perform an operation that emits the operating sound, and is configured to cause the second startup sound generated by the startup sound generation unit <NUM> to be output from the sound output unit <NUM> in a state in which the accessory <NUM> is set to perform an operation that emits the operating sound.

In general, the accessory, in particular, the HUD device tends to emit an operating sound that is unpleasant for the occupant in the vehicle interior at the time of startup of the vehicle. In the vehicle-interior sound-adjustment apparatus <NUM> according to the embodiment, in particular, as a startup sound which is output from the sound output unit <NUM> each time the vehicle <NUM> is started up, the first startup sound composed of the first sound can be used in a state in which the accessory <NUM> is not operating in a manner in which the operating sound is emitted, and the second startup sound composed of the second sound and the masking sound can be used in a state in which the accessory <NUM> is operating in a manner in which the operating sound is emitted. Therefore, in a state in which the accessory <NUM> is operating and emitting an operating sound, while preventing the occupant from feeling strange to the second startup sound serving as the startup sound that is output at every startup, it is possible to efficiently suppress the operating sound of the accessory <NUM> being heard by the occupant by using the second startup sound as the masking sound.

The second sound of the second startup sound has a higher frequency than the first sound of the first startup sound. Therefore, there is substantially no difference in the frequency between the operating sound of the HUD device <NUM> and the second startup sound. Hence, with the second startup sound, due to a cocktail party effect, it is difficult for the occupant to capture the sound in the frequency band in which the operating sound of the HUD device <NUM> is produced so that discomfort and a strange feeling to the masking sound felt by the occupant can be suppressed. Therefore, it is possible to efficiently suppress the operating sound of the accessory <NUM> being heard by the occupant while reducing discomfort and a strange feeling of the occupant.

In the vehicle-interior sound-adjustment apparatus <NUM> according to the embodiment, the masking sound generation unit <NUM> is configured to adjust the frequency at the peak of the sound pressure level of the masking sound in accordance with the cumulative number of operations of the accessory <NUM>. Therefore, it is possible to efficiently suppress the operating sound of the accessory <NUM> being heard by the occupant even when the operating sound of the accessory <NUM> changes due to aging degradation of the accessory <NUM>.

Claim 1:
A vehicle-interior sound-adjustment apparatus (<NUM>) configured to be able to suppress an operating sound of an accessory (<NUM>) provided in a vehicle interior (<NUM>) of a vehicle (<NUM>) being heard by an occupant in the vehicle interior (<NUM>), the vehicle-interior sound-adjustment apparatus (<NUM>) comprising:
a sound output unit (<NUM>) configured to be able to output a sound to the vehicle interior (<NUM>);
a startup sound generation unit (<NUM>) configured to be able to generate a startup sound emitted at time of startup of the vehicle (<NUM>); and
a control unit (<NUM>) configured to cause the startup sound generated by the startup sound generation unit (<NUM>) to be output from the sound output unit (<NUM>),
characterized in that:
the vehicle-interior sound-adjustment apparatus (<NUM>) further comprises a masking sound generation unit (<NUM>) configured to be able to generate a masking sound for masking the operating sound of the accessory (<NUM>);
the startup sound generation unit (<NUM>) is configured to generate a first startup sound composed of a first sound, and a second startup sound composed of a second sound having a higher frequency than the first sound, and the masking sound generated by the masking sound generation unit (<NUM>);
the control unit (<NUM>) is configured to cause the first startup sound generated by the startup sound generation unit (<NUM>) to be output from the sound output unit (<NUM>) in a state in which the accessory is set so as not to perform an operation that emits the operating sound, and is configured to cause the second startup sound generated by the startup sound generation unit (<NUM>) to be output from the sound output unit (<NUM>) in a state in which the accessory (<NUM>) is set to perform an operation that emits the operating sound; and
the masking sound generation unit (<NUM>) is configured to adjust a frequency at a peak of a sound pressure level of the masking sound in accordance with a cumulative number of operations of the accessory (<NUM>).