JP2020053754A - Electronic apparatus - Google Patents

Abstract

To provide an electronic apparatus performing sound reproduction with a high sound quality, by outputting properly from a low range sound to a high range sound.SOLUTION: An electronic apparatus 10 has a portable information apparatus 14 including built-in speakers 25L, 25R, and an extension device 12 including speakers 16L, 16R. The portable information apparatus 14 has a mode changeover section 72 for setting a drive mode or a non-drive mode of the built-in speakers 25L, 25R and the speakers 16L, 16R, and an acoustic adjustment section 74 for adjusting acoustic data 78 outputted to the built-in speakers 25L, 25R and the speakers 16L, 16R, by a standalone mode and a composite mode set by the mode changeover section 72. The acoustic adjustment section 74 outputs the acoustic data 78 to the built-in speakers 25L, 25R at the time of standalone mode, and at the time of composite mode, extracts a high frequency sound from the acoustic data 78 and outputs to the built-in speakers 25L, 25R, and extracts a low frequency sound from the acoustic data 78 and outputs to the speakers 16L, 16R.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electronic device having a portable information device having a first speaker and an extension device having a second speaker and being combined with the portable information device.

  For example, the functions of portable information devices such as notebook PCs are often limited because their housings are rapidly becoming thinner. Therefore, an extension device is provided as a dedicated device for extending the function of such portable information devices (for example, see Patent Document 1).

Japanese Patent No. 5782471

  The speaker mounted on the portable information device as described above is arranged at a position where the user can easily hear the sound as much as possible. However, as the housing of portable information equipment has become thinner, the sound quality and range have been limited due to the effects of thinner and smaller speakers, especially when the output characteristics of low-frequency sounds are insufficient. Has become.

  Therefore, some users use a large external speaker. However, even if external speakers are used, high-frequency sounds with high directivity may not be able to reach the user properly due to layout restrictions due to their large size. Setting it in the wrong direction can be cumbersome.

  The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide an electronic device that appropriately outputs from low-frequency sounds to high-frequency sounds to reproduce sound with high sound quality. .

  In order to solve the above-described problems and achieve the object, an electronic device according to an embodiment of the present invention includes a portable information device including a first speaker and an extension combined with the portable information device including a second speaker. And a device, wherein the portable information device includes: a mode switching unit that sets a mode for driving and non-driving the first speaker and the second speaker; and a mode switching unit that sets the mode. A sound adjustment unit that adjusts sound data to be output to the first speaker and the second speaker according to a single mode and a combined mode, and when the single mode is selected by the mode switching unit, The sound adjustment unit outputs the sound data to the first speaker, and when the composite mode is selected by the mode switching unit, the sound adjustment unit outputs the sound data. And outputs the data by extracting the high-frequency sound to the first speaker, the acoustic data by extracting a low-frequency sound is output to the second loudspeaker.

  The extension device is detachable from the portable information device, and the mode switching unit selects the single mode when the extension device is not mounted, and the mode switching unit selects the single mode when the extension device is mounted. The composite mode may be selected. As a result, the simple mode and the composite mode are automatically switched with respect to the attachment / detachment of the extension device, so that the user can easily handle.

  The sound adjustment unit may enhance the low-frequency sound of the sound data when the single mode is selected, as compared to when the composite mode is selected. As a result, even in the simplex mode, a corresponding low-frequency sound can be obtained from the first speaker.

  The portable information device has a keyboard on an upper surface, and a display housing provided with a display at a rear end thereof is connected, and the extension device has a configuration in which the second speaker is provided on the front, and The electronic device may be positioned on the rear end side of the lower surface of the information device, and the lower surface of the expansion device and the front end of the lower surface of the portable information device may be a landing surface with respect to the mounting surface of the electronic device. In this manner, by providing the extension device on the lower surface side of the portable information device, the keyboard has an appropriate forward-downward inclined posture, so that the operability is improved and at the same time, the second speaker is provided in front of the extension device. Space for sound to pass can be secured. Further, the second speaker is shielded by the lower surface of the portable information device, but the second speaker outputs low-frequency sound having low directivity, so that the influence of the shielding is small.

  An electronic device according to the above aspect of the present invention includes a portable information device including a first speaker, and an extension device including a second speaker and combined with the portable information device. The sound adjustment unit outputs the sound data to the first speaker in the simplex mode, extracts the high-frequency sound from the sound data in the combined mode and outputs the sound to the first speaker, and also extracts the low-frequency sound from the sound data. And outputs it to the second speaker. As a result, high-frequency sounds having high directivity are output from the first speaker of the portable information device, and low-frequency sounds having low directivity are output from the second speaker of the expansion device. The information is properly transmitted to the user without depending on the user. Further, the second speaker is not limited in size as the first speaker of the portable information device, and high sound quality is achieved. Therefore, sound is reproduced with high sound quality by appropriately outputting from low-frequency sounds to high-frequency sounds.

FIG. 1 is an exploded perspective view showing an operation of attaching an extension device to a portable information device in an electronic device according to an embodiment of the present invention. FIG. 2A is a side view showing an operation of attaching the extension device to a portable information device. FIG. 2B is a side view of an electronic device in which the extension device is mounted on a portable information device. FIG. 3 is a main part enlarged bottom view schematically illustrating a configuration example of a lower surface of a device housing of the portable information device. FIG. 4 is an exploded perspective view of the expansion device. FIG. 5A is a plan view of the expansion device. FIG. 5B is a rear view of the expansion device. FIG. 6 is a block diagram illustrating a sound output relationship in the electronic device according to the embodiment of the present invention. FIG. 7A is an electronic device according to a modification, and is a perspective view illustrating a state in which an external speaker is arranged on a rear side of a display housing. FIG. 7B is an electronic device according to a modification, and is a perspective view illustrating a state in which the direction of an external speaker is oblique.

  Hereinafter, a preferred embodiment of an expansion device according to the present invention will be described in detail with reference to the accompanying drawings, taking a preferred embodiment in relation to a portable information device detachably attached to the device.

  FIG. 1 is an exploded perspective view showing an operation of attaching an extension device 12 to a portable information device 14 in an electronic device 10 according to one embodiment of the present invention. FIG. 2A is a side view illustrating an operation of attaching the extension device 12 to the portable information device 14. FIG. 2B is a side view of the electronic device 10 in which the extension device 12 is mounted on the portable information device 14.

  The electronic device 10 of the present embodiment is configured such that the extension device 12 is detachably attached to a portable information device 14 such as a notebook PC. The expansion device 12 includes a pair of left and right speakers (second speakers) 16L and 16R, and improves the speaker function of the portable information device 14. The portable information device 14 may be used for expanding the functions of a portable information device other than a clamshell notebook PC, for example, a tablet PC.

  Hereinafter, as shown in FIG. 2B, the thickness of the portable information device 14, which is a notebook PC to which the extension device 12 is attached, is set such that the near side is the front, the back side is the rear, and the thickness of the extension device 12. The direction will be described as up and down, and the width direction as left and right.

  As shown in FIGS. 1 to 2B, the portable information device 14 has a configuration in which a device housing 18 and a display housing 20 are rotatably connected by a hinge 22. The device housing 18 is a housing formed in a thin rectangular box shape. The device housing 18 has a keyboard 24 and a pair of left and right built-in speakers (first speakers) 25L and 25R on an upper surface 18a, and the extension device 12 is attached to and detached from a lower surface 18b.

  The built-in speakers 25L and 25R are small and are provided near the left and right ends in front of the upper surface 18a. The built-in speakers 25L and 25R are located in front of the user and at a position where the user can easily hear the sound because there is no obstacle that obstructs the transmission of the sound. Further, the built-in speakers 25L and 25R are appropriately separated to the left and right, which is suitable for reproducing stereo sound. On the other hand, since the built-in speakers 25L and 25R are small, the output characteristics of low-frequency sounds are not always sufficient.

  The display housing 20 is a housing formed in a thin rectangular box shape, and has a display 26 on most of the front surface. The hinge 22 connects the lower end of the display housing 20 to the rear end of the device housing 18. The hinge 22 of the present embodiment is a structure that projects rearward from the rear surface 18c of the device housing 18 when the display housing 20 is opened (see the hinge 22 indicated by a two-dot chain line in FIG. 2B), that is, a so-called drop-down structure. . The hinge 22 may have a structure other than the drop-down structure. The portable information device 14 may have a configuration in which, for example, the display housing 20 is configured by a tablet PC, the device housing 18 is configured as a keyboard 24, and both are detachable.

  As shown in FIGS. 2A to 3, a pair of left and right legs 28 </ b> L and 28 </ b> R, a positioning hole 30, a connected portion 32, and a terminal plate 34 are provided on the lower surface 18 b of the device housing 18. . Further, the device housing 18 is provided such that a plurality of magnets 36aS, 36bS, 36cS, 37aN, 37bN, 37cN face the lower surface 18b.

  The legs 28L, 28R are provided on the left and right of the rear of the lower surface 18b, respectively, and protrude downward from the lower surface 18b. Each of the legs 28L and 28R has an oblong dome shape whose longitudinal direction extends in the left-right direction. In other words, each of the legs 28L and 28R has a tapered shape whose diameter is reduced so that the cross-sectional area in the horizontal direction gradually decreases from the lower surface 18b toward the top surface. The legs 28L and 28R may have various shapes other than the oblong dome shape, such as a circular dome shape, a rectangular dome shape, and a rectangular parallelepiped. In the case of the present embodiment, the legs 28L and 28R include a pedestal-shaped base 28a fixed to the lower surface 18b and a rubber contact portion 28b fixed to the surface of the base 28a. That is, the legs 28L and 28R are so-called rubber legs.

  The positioning hole 30 is a small-diameter hole formed substantially at the center on the left and right sides on the rear end side of the lower surface 18b. The positioning hole 30 is formed in a resin or metal plate which is a housing member forming the lower surface 18 b of the device housing 18. The positioning hole 30 is arranged at a position close to the rear side of the connected portion 32.

  The connected portion 32 is disposed in front of the positioning hole 30 at substantially the right and left central portions on the rear end side of the lower surface 18b. The connected portion 32 is embedded in the device housing 18 and has a surface exposed at the lower surface 18b. The connected unit 32 is a communication unit that is electrically connected to a connection unit 40 (see FIG. 5A) of the expansion device 12 described below. The connected portion 32 includes an optical communication module 32a that is a non-contact type electrical connection unit, and a terminal plate 32b that is a contact type electrical connection unit. The connected part 32 may be composed of, for example, only one of the optical communication module 32a and the terminal plate 32b. The connected part 32 may be omitted.

  The terminal plate 34 is arranged on the right side of the left leg 28L. The terminal plate 34 is a metal plate that is in contact with and electrically connected to a spring pin 41 (see FIG. 5A) of the expansion device 12 described later. In the case of the present embodiment, a sound output such as voice or music from the portable information device 14 is transmitted from the terminal plate 34 to the extension device 12 via the spring pin 41, and is reproduced by the speakers 16L and 16R.

  The magnets 36aS to 36cS and 37aN to 37cN are magnets that are arranged at the bottom in the device housing 18 and face the lower surface 18b to generate a magnetic force via the lower surface 18b of the device housing 18. . The magnets 36aS to 36cS and 37aN to 37cN are provided along the left-right direction at positions overlapping the mounting position of the expansion device 12 with respect to the lower surface 18b (see the expansion device 12 indicated by a two-dot chain line in FIG. 3). When the expansion device 12 is positioned with respect to the lower surface 18b, the magnets 36aS to 36cS and 37aN to 37cN serve as a plurality of magnets 42aN, 42bN, 42cN, 43aS, 43bS, and 43cS on the expansion device 12 described later (see FIG. 5A). ) And each can be adsorbed.

  As shown in FIGS. 1 to 2B, the expansion device 12 includes a device housing 44 and a pair of left and right speakers 16L and 16R mounted on the device housing 44. The device housing 44 is a housing formed in a prism shape extending in the left-right direction. The upper surface 44a of the device housing 44 serves as a mounting surface for the lower surface 18b of the device housing 18 of the portable information device 14, and the lower surface 44b serves as a landing surface for a use surface 46 such as a desk top.

  The device housing 44 has a forwardly inclined shape in which the thickness between the upper surface 44a and the lower surface 44b gradually decreases in a direction from the rear surface 44c to the front surface 44d, that is, in a direction from the rear to the front (FIG. 2A and FIG. 2B). In the case of the present embodiment, the lower surface 44b is constituted by a horizontal plane orthogonal to the rear surface 44c, and the upper surface 44a is constituted by an inclined surface falling forward. The device housing 44 is configured such that its front-back dimension is shorter than the front-back dimension of the device housing 18, and is mounted on the rear end side of the lower surface 18 b of the device housing 18. Thus, in the electronic device 10, the lower surface 44 b of the expansion device 12 becomes the landing surface on the rear end side with respect to the use surface 46, and the front end of the lower surface 18 b of the device housing 18 of the portable information device 14 becomes the landing surface on the front end side. As a result, it is disposed on the use surface 46 in a downwardly inclined posture (see FIG. 2B). As a result, the keyboard 24 mounted on the upper surface 18a of the device housing 18 has an appropriate forward-downward inclined posture, so that its operability is improved and, at the same time, sound from the speakers 16L and 16R is provided in front of the expansion device 12. A space S to be passed can be secured. Further, since the expansion device 12 fits under the equipment housing 18, the space is saved. Rubber legs or the like similar to the legs 28L and 28R may be provided on the lower surface 44b.

  FIG. 4 is an exploded perspective view of the expansion device 12.

  As shown in FIGS. 1 and 4, the device housing 44 has a configuration in which a lower surface opening of an upper cover 48 that is opened downward is closed by a base plate 49. The speakers 16L and 16R are mounted on a common speaker box 50. The speaker box 50 on which the speakers 16L and 16R are mounted is disposed in the upper cover 48, and the lower surface thereof is supported by a support plate 52 held on the inner surface of the base plate 49.

  The front surface 48a of the upper cover 48 is formed in a substantially V-shape in plan view, with the left half facing the front and the left half facing the front and the right half facing the right. The left and right speakers 16L, 16R are arranged facing the left and right openings 48L, 48R formed in the front surface 48a. Thereby, the left speaker 16L is installed facing the direction inclined leftward from the front on the front surface 44d, and the right speaker 16R is installed facing facing rightward from the front on the front surface 44d (FIG. 5A). See also). A frame 56 is attached to the front surface 48a of the upper cover 48 via a mesh plate 54 that covers the openings 48L and 48R. By the way, as shown in FIGS. 1 and 2B, the thickness of the device housing 44 in the vertical direction is considerably larger than the thickness of the device housing 18 of the portable information device 14. For this reason, the speakers 16L and 16R mounted on the expansion device 12 are superior in output characteristics particularly in a low-frequency range as compared with the built-in speakers 25L and 25R of the portable information device 14.

  FIG. 5A is a plan view of the expansion device 12. FIG. 5B is a rear view of the expansion device 12, and is a view of the expansion device 12 as viewed from the direction of the arrow VB in FIG. 5A.

  As shown in FIGS. 4 to 5B, a pair of left and right fitting holes 58 </ b> L and 58 </ b> R, a positioning pin 60, a connecting portion 40, and a plurality of spring pins 41 are provided on the upper surface 44 a of the device housing 44. ing. Further, the device housing 44 is provided such that a plurality of magnets 42aN to 42cN and 43aS to 43cS face the upper surface 44a. A plurality of connection terminals 62a, 62b, 62c and a pair of left and right baffle ports 64L, 64R are provided on a rear surface 44c of the device housing 44.

  Each of the fitting holes 58L and 58R is a concave portion provided at the rear left and right of the upper surface 44a. Each of the fitting holes 58L and 58R has an oblong bathtub shape whose longitudinal direction extends along the left-right direction. That is, each of the fitting holes 58L and 58R has a tapered shape whose diameter is reduced so that the horizontal cross-sectional area gradually decreases from the upper surface 44a toward the bottom surface. The fitting holes 58L and 58R are holes into which the legs 28L and 28R of the portable information device 14 fit. Therefore, the shape of each of the fitting holes 58L and 58R may be a shape that allows each of the legs 28L and 28R to be fitted with a predetermined tolerance according to the shape of each of the legs 28L and 28R. The fitting holes 58L and 58R are fitted with the legs 28L and 28R to position the extension device 12 in a predetermined position with respect to the lower surface 18b of the portable information device 14 in the front-rear and left-right directions. 12 is prevented from rotating in the horizontal direction.

  The positioning pin 60 is a small-diameter pin that protrudes upward from a substantially central portion on the left and right sides on the rear end side of the upper surface 44a, and is made of, for example, metal. The positioning pin 60 can be fitted into the positioning hole 30 on the lower surface 18b of the portable information device 14. The positioning pins 60 are fitted in the positioning holes 30 to more precisely position the extension device 12 in the front-rear and left-right directions at a predetermined position with respect to the lower surface 18b of the portable information device 14. The positioning pins 60 may be omitted.

  The connecting portion 40 is disposed in front of the positioning pin 60 at substantially the right and left central portions on the rear end side of the upper surface 44a. The connecting portion 40 is embedded in the device housing 44 and has a surface exposed at the upper surface 44a. The connection unit 40 is a communication unit that is electrically connected to the connected unit 32 provided on the lower surface 18 b of the portable information device 14. The connection section 40 has an optical communication module 40a, which is a non-contact type electric connection means, and a terminal pin 40b, which is a contact type electric connection means. The optical communication module 40a is arranged to face the optical communication module 32a on the portable information device 14 side. The terminal pins 40b are, for example, a pair of front and rear terminals, and are elastically retractable metal pins that come into contact with the terminal plate 32b on the portable information device 14 side. For example, the two terminal pins 40b are a power supply pin and a ground pin, respectively. The connection section 40 may be configured with only one of the optical communication module 40a and the terminal pin 40b, similarly to the above-described connected section 32, or may be omitted.

  The spring pin 41 is disposed on the right side of the left fitting hole 58L. The spring pin 41 is, for example, an elastically retractable metal pin in which four right and left pins are arranged side by side. Each spring pin 41 contacts the terminal plate 34 on the lower surface 18b of the portable information device 14 and is electrically connected thereto. As described above, the spring pin 41 serves as a receiving unit for outputting sound such as voice or music from the portable information device 14. The electronic device 10 may transmit the sound output from the portable information device 14 to the extension device 12 by, for example, a wireless connection method instead of the connection method using the spring pins 41 and the terminal plate 34.

  Each of the magnets 42aN to 42cN and 43aS to 43cS is a magnet that is arranged at an upper part in the device housing 44 and is arranged so as to face the upper surface 44a, thereby generating a magnetic force via the upper surface 44a of the device housing 44. . At this time, the magnets 42aN to 42cN have N poles facing the upper surface 44a, and the magnets 43aS to 43cS have S poles facing the upper surface 44a. Similarly, on the portable information device 14 side, the magnets 36aS to 36cS have S poles facing the lower surface 18b, and the magnets 37aN to 37cN have N poles facing the lower surface 18b.

  The magnets 42aN to 42cN and 43aS to 43cS are arranged at positions facing the magnets 36aS to 36cS and 37aN to 37cN arranged on the lower surface 18b of the portable information device 14, respectively. Specifically, the magnet 42aN faces the magnet 36aS, the magnet 42bN faces the magnet 36bS, and the magnet 42cN faces the magnet 36cS. Further, the magnet 43aS faces the magnet 37aN, the magnet 43bS faces the magnet 37bN, and the magnet 43cS faces the magnet 37cN. As a result, an attractive force is generated between each of the magnets 42aN to 42cN, 43aS to 43cS and each of the magnets 36aS to 36cS, 37aN to 37cN. It is attached detachably. In the case of the present embodiment, the magnets 42aN to 42cN and 43aS to 43cS have N poles and S poles alternately arranged in the arrangement direction. Therefore, a certain degree of positioning action occurs between each of the magnets 42aN to 42cN, 43aS to 43cS and each of the magnets 36aS to 36cS, 37aN to 37cN.

  As described above, the fitting holes 58L, 58R, the magnets 42aN to 42cN, 43aS to 43cS, and the positioning pins 60 position the expansion device 12 with respect to the lower surface 18b of the portable information device 14, and removably mount the positioning device. The part 66 is constituted.

  The connection terminals 62a to 62c are, for example, terminals conforming to the USB (Universal Serial Bus) standard and terminals conforming to various other standards. The connection terminals 62a to 62b can connect external devices (not shown) such as an external storage device and a monitor device. The external devices connected to the connection terminals 62a and 62b are electrically connected to the portable information device 14 via the connection portion 40 and the connected portion 32, and can be operated on the portable information device 14 side. The connection terminals 62a to 62c may be omitted.

  FIG. 6 is a block diagram related to a sound output relationship in the electronic device 10. In the portable information device 14, the data relating to the sound is in a stereo format, and there are two left and right signals. However, in FIG. 6, the two signals are shown by one line so as not to be complicated.

  As shown in FIG. 6, the portable information device 14 includes a communication control unit 70, a mode switching unit 72, and a sound adjustment unit 74. The communication control unit 70, the mode switching unit 72, and the sound adjustment unit 74 are realized by, for example, causing a processing device such as a CPU (Central Processing Unit) to execute a program, that is, realized by software, but an IC (Integrated Circuit). ), Or may be realized by using software and hardware together.

  The communication control unit 70 is a unit that performs communication with the expansion device 12 via the connected unit 32 and the connection unit 40. When the communication between the connection unit 40 and the connected unit 32 is established, the communication control unit 70 can detect that the extension device 12 has been attached to the portable information device 14. It also serves as a means. The communication control unit 70 notifies the mode switching unit 72 of information about whether the extension device 12 is attached to or detached from the portable information device 14. The means for detecting the attachment of the extension device 12 is not limited to this. For example, a magnetic sensor (for example, a hall sensor) is mounted on a substrate in the portable information device 14, and the magnet of the extension device 12 approaches when the extension device 12 is attached. This may be detected by the magnetic sensor. The presence or absence of the extension device 12 can be detected by reading the signal of the magnetic sensor by the mode switching unit 72.

  The mode switching unit 72 is a part that sets a mode for driving and not driving the speakers 16L and 16R and the built-in speakers 25L and 25R. When the extension device 12 is removed from the portable information device 14, the mode switching unit 72 operates the sound adjustment unit 74 to drive the built-in speakers 25L and 25R as a single mode. On the other hand, when the expansion device 12 is mounted on the portable information device 14, the sound adjustment unit 74 is operated to drive the speakers 16L and 16R and the built-in speakers 25L and 25R in the combined mode. In FIG. 6, this switching process is indicated by a schematic switch 76. Note that the mode switching by the mode switching unit 72 is not limited to an automatic mode, and may be switched based on a user operation.

  The sound adjustment section 74 is a section that adjusts the sound data 78 output to the built-in speakers 25L and 25R and the speakers 16L and 16R, and the adjustment method differs depending on the simplex mode and the composite mode. The sound data 78 may be stored in a predetermined storage unit or may be supplied in real time from a communication line. The sound data 78 may be data composed of only voice and sound, or may be data combined with an image. The data format (for example, compression format) of the acoustic data 78 is not limited, but depending on the data format, it is used after a predetermined code conversion.

  Output data from the sound adjustment unit 74 is output to the built-in speakers 25L and 25R via the output unit 80, and is output to the speakers 16L and 16R via the output unit 82. The output units 80 and 82 are digital / analog converters and amplifiers, and drive the built-in speakers 25L and 25R and the speakers 16L and 16R. The form of the amplifier may be analog type or digital type.

  The sound adjustment unit 74 includes a low-frequency emphasis unit 84 that emphasizes low-frequency components from the audio data 78, a high-pass filter 86 that extracts only wide-frequency components from the audio data 78, and a low-frequency filter 86 that extracts low-frequency components from the audio data 78. And a low-pass filter 88 that extracts only the portion of The low-frequency emphasis unit 84 is set according to the characteristics of the built-in speakers 25L and 25R. The high-pass filter 86 and the low-pass filter 88 are set according to the characteristics of the built-in speakers 25L and 25R and the speakers 16L and 16R. The crossover frequency is set so that the frequency characteristic becomes flat when the high-pass filter 86 and the low-pass filter 88 are combined.

  When the single mode is selected by the mode switching unit 72, the sound adjusting unit 74 outputs the sound data 78 to the built-in speakers 25L and 25R via the output unit 80, and does not output the sound data 78 to the speakers 16L and 16R. Thus, in the single mode, only the built-in speakers 25L and 25R are driven, and the speakers 16L and 16R are not driven. In the simplex mode, the sound adjustment unit 74 outputs the sound data 78 to the built-in speakers 25L and 25R through the low-frequency emphasizing unit 84. As a result, the low-frequency sound of the acoustic data 78 is enhanced in the simplex mode as compared to when the composite mode is selected. The built-in speakers 25L and 25R may not have sufficient low-frequency sound output characteristics due to size restrictions. However, by outputting the acoustic data 78 through the low-frequency emphasizing unit 84, the low-frequency sounds are compensated for and the corresponding sounds are appropriately compensated. Sound is obtained.

  When the composite mode is selected by the mode switching unit 72, the sound adjustment unit 74 outputs the sound data 78 to the built-in speakers 25L and 25R via the output unit 80, and outputs the sound data 78 via the output unit 82. Is output to the speakers 16L and 16R. Thus, in the combined mode, the 25L and 25R and the speakers 16L and 16R are driven. In the composite mode, the acoustic adjustment unit 74 cuts low-frequency sounds and extracts and outputs only high-frequency sounds by passing the audio data 78 through the high-pass filter 86 for the built-in speakers 25L and 25R. Further, in the composite mode, the sound adjusting unit 74 cuts out the high-frequency sound and extracts and outputs only the low-frequency sound by passing the sound data 78 through the low-pass filter 88 for the speakers 16L and 16R.

  In this way, the built-in speakers 25L and 25R handle high-frequency sounds, and the speakers 16L and 16R handle low-frequency sounds. Conceptually, the built-in speakers 25L and 25R function as tweeters, and the speakers 16L and 16R function as woofers. Become.

  As described above, the extension device 12 is disposed below the lower surface 18b of the device housing 18 of the portable information device 14 (see FIG. 2B). A space S through which sounds from the speakers 16L and 16R pass is secured in front of the expansion device 12, but high-frequency sounds having high directivity are blocked or reflected to some extent by the lower surface 18b. On the other hand, in the electronic device 10 according to the present embodiment, since only low-frequency sounds having low directivity are output from the speakers 16L and 16R, they are propagated to the surroundings without being affected by the lower surface 18b. On the other hand, the built-in speakers 25L and 25R output only high-frequency sounds with high directivity, and are arranged at appropriate places where the user can easily listen. Therefore, the user can properly listen to the low-frequency sound and the high-frequency sound. Since the built-in speakers 25L and 25R do not output low-frequency sounds whose output characteristics are insufficient, high-quality sound is achieved by specializing in high frequencies. Since the speakers 16L and 16R do not output high-frequency sounds, it is possible to prevent unnatural reverberation due to reflection of the high-frequency sounds on the lower surface 18b. In addition, the built-in speakers 25L and 25R are effectively used even when the extension device 12 is mounted.

  In addition, the virtual surround function can be used in recent personal computers. The virtual surround function can improve the sense of stereo with a small size or enhance the sense of presence in movies and games, but the effect of high-frequency sounds is particularly large, and the effect of low-frequency sounds is relatively small. In the electronic device 10 according to the present embodiment, since high-frequency sounds are output by the built-in speakers 25L and 25R, there is no obstacle to the user, and the virtual surround function is properly realized. On the other hand, in a movie or a game, it is desired to output a powerful low-frequency sound. The low-frequency sound is appropriately output by the large-sized speakers 16L and 16R.

  7A and 7B are perspective views showing an electronic device 10a according to a modification. As shown in FIG. 7A, a pair of left and right external speakers (extension device, second speaker) 90L and 90R are used in the electronic device 10a. The external speakers 90L and 90R are connected to the portable information device 14 instead of the above-described expansion device 12, and are approximately the same size or larger as the speakers 16L and 16R, and have excellent low-frequency sound output characteristics. . The connection between the portable information device 14 and the external speakers 90L, 90R may be wired or wireless. A digital / analog converter may be interposed between the portable information device 14 and the external speakers 90L, 90R.

  In the electronic device 10a, even when such external speakers 90L and 90R are used, the high-frequency sounds are handled by the built-in speakers 25L and 25R, and the low-frequency sounds are handled by the external speakers 90L and 90R. This is effective under the constraint that the external speakers 90L and 90R must be arranged on the rear side of the display housing 20 because the use surface 46 is narrow as shown in FIG. 7A, for example. That is, since the external speakers 90L and 90R output low-frequency sounds having low directivity, the external speakers 90L and 90R are hardly affected by the display housing 20, and the sound propagates to the surroundings. On the other hand, the high-frequency sounds are handled by the built-in speakers 25L and 25R, so that they have no obstacles and are appropriately transmitted to the user.

  Further, as shown in FIG. 7B, when the orientation of the external speakers 90L and 90R is inappropriate (for example, facing diagonally outward) and not facing the user properly, the external speakers 90L and 90R are not oriented properly. Even if a high-frequency sound is output from the 90R, it is not properly transmitted to the user because of its directivity. On the other hand, in the electronic device 10a, the high-frequency sound is output from the built-in speakers 25L and 25R instead of the external speakers 90L and 90R, so that the sound is appropriately transmitted to the user. Therefore, the user does not need to pay too much attention to the settings of the external speakers 90L and 90R.

  As described above, the electronic devices 10 and 10a according to the present embodiment include the portable information device 14 including the built-in speakers 25L and 25R, and the extension device 12 including the speakers 16L and 16R or the external speakers 90L and 90R. . The sound adjustment unit 74 outputs the sound data 78 to the built-in speakers 25L and 25R in the single mode, extracts the high-frequency sound from the sound data 78 in the combined mode and outputs the sound to the built-in speakers 25L and 25R, and The low frequency sound is extracted from the data 78 and output to the speakers 16L and 16R or the external speakers 90L and 90R. Thereby, high-frequency sounds with high directivity are output from the built-in speakers 25L and 25R, and low-frequency sounds with low directivity are output from the speakers 16L and 16R or the external speakers 90L and 90R. The information is properly communicated to the user without depending on the user. Further, the speakers 16L, 16R and the external speakers 90L, 90R are not limited in size as in the built-in speakers 25L, 25R, and high sound quality can be achieved. Therefore, sound is reproduced with high sound quality by appropriately outputting from low-frequency sounds to high-frequency sounds.

  The present invention is not limited to the above-described embodiment, and can be freely modified without departing from the gist of the present invention.

10, 10a Electronic device 12 Expansion device 14 Portable information device 16L, 16R Speaker (second speaker)
18 Equipment housing 18a Upper surface 18b Lower surface 20 Display housing 24 Keyboards 25L, 25R Built-in speaker (first speaker)
44 device housing 70 communication control unit 72 mode switching unit 74 acoustic adjustment unit 78 acoustic data 80, 82 output unit 84 low-frequency emphasis unit 86 high-pass filter 88 low-pass filter 90L, 90R external speakers (extension device, second speaker)

In order to solve the above-described problems and achieve the object, an electronic device according to an embodiment of the present invention includes a portable information device including a first speaker and an extension combined with the portable information device including a second speaker. Device, wherein the portable information device has a keyboard on an upper surface, and a display housing provided with a display at a rear end thereof is connected, and the first speaker and the first A mode switching unit that sets a mode for driving and non-driving of the two speakers, and the sound data output to the first speaker and the second speaker is adjusted by a single mode and a composite mode set by the mode switching unit. An audio adjustment unit, wherein when the single mode is selected by the mode switching unit, the audio adjustment unit transmits the audio data to the first speed. And when the composite mode is selected by the mode switching unit, the sound adjustment unit extracts a high-frequency sound from the sound data and outputs the extracted high-frequency sound to the first speaker, and outputs a low-frequency sound from the sound data. Extracting a sound and outputting the extracted sound to the second speaker , wherein the extension device has a configuration in which the second speaker is provided at the front, and is positioned at a rear end side of a lower surface of the portable information device, and a lower surface of the extension device; wherein the front end portion of the lower surface of the portable information device, ing a landing surface for the mounting surface of the electronic device. In this manner, by providing the extension device on the lower surface side of the portable information device, the keyboard has an appropriate forward-downward inclined posture, so that the operability is improved and at the same time, the second speaker is provided in front of the extension device. Space for sound to pass can be secured. Further, the second speaker is shielded by the lower surface of the portable information device, but the second speaker outputs low-frequency sound having low directivity, so that the influence of the shielding is small.

Claims (4)

A portable information device having a first speaker;
An extension device including a second speaker and being combined with the portable information device;
An electronic device having
The portable information device,
A mode switching unit that sets a mode related to driving and non-driving of the first speaker and the second speaker;
An audio adjustment unit that adjusts audio data to be output to the first speaker and the second speaker according to a single mode and a composite mode set by the mode switching unit;
Has,
When the single mode is selected by the mode switching unit, the sound adjustment unit outputs the sound data to the first speaker,
When the composite mode is selected by the mode switching unit, the sound adjustment unit extracts a high-frequency sound from the sound data and outputs the high-frequency sound to the first speaker, and extracts a low-frequency sound from the sound data. An electronic device for outputting to the second speaker. The electronic device according to claim 1,
The expansion device is detachable from the portable information device,
The electronic apparatus according to claim 1, wherein the mode switching unit selects the single mode when the extension device is not mounted, and selects the composite mode when the extension device is mounted. The electronic device according to claim 1, wherein
The electronic device according to claim 1, wherein the sound adjustment unit enhances the low-frequency sound of the sound data when the single mode is selected, as compared to when the composite mode is selected. The electronic device according to any one of claims 1 to 3,
The portable information device has a keyboard on the upper surface, a configuration in which a display housing provided with a display at the rear end is connected,
The extension device has a configuration in which the second speaker is provided at the front, and is positioned at a rear end side of a lower surface of the portable information device,
An electronic device, wherein a lower surface of the extension device and a front end of a lower surface of the portable information device are grounded on a mounting surface of the electronic device.

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