JP2008160224A - Electronic apparatus system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the matter of a device for displaying data from an externally connected personal computer on a display monitor under a state where the display monitor is connected with a stand otherwise displaying a broadcast program that since displaying a high-definition video image of a digital broadcast or the like is not assumed, power consumption is big if the high-definition video image is displayed by radio and thereby it can be viewed/listened only for a short time. <P>SOLUTION: This inventive technology displays a high-definition video image on a display monitor when the display monitor is connected with a stand otherwise performs image conversion (from HD video image to SD video image) on the stand side and displays a video image of standard definition transmitted by radio on the display monitor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic device system that converts an encoding rate of stream information in accordance with the detection of attachment / detachment in an electronic device system including two electronic devices that can be attached to and detached from each other.

Conventionally, a technique capable of switching an image displayed on a display monitor according to a connection state between the display monitor and the stand has been proposed (for example, see Patent Document 1). When the display monitor and the stand are connected, the display monitor functions as a display of an externally connected personal computer. When the display monitor is not connected, the display monitor is a wireless television for displaying broadcast programs and the like. Fulfills the function.
JP 2002-204408 A

  However, in the invention described in Patent Document 1, since it is not assumed that high-quality video such as digital broadcasting is displayed, if the high-quality video is displayed wirelessly, the receiving side There is a problem that the circuit is required to operate at high speed, consumes a large amount of power, and can only be viewed for a short time.

  In view of such circumstances, the present invention displays high-quality video on the display monitor when the display monitor and the stand are connected, and converts video (from HD video to SD) on the stand side when the display monitor is not connected. A technology for displaying a standard-definition video image transmitted wirelessly on a display monitor is proposed.

  As described above, the electronic device system according to the present invention can view both a high-quality video such as a high-definition broadcast and a standard-definition video according to the attachment / detachment state of the electronic device. When the electronic devices are not connected, the battery life of the portable display (second electronic device) can be extended by converting the encoding rate to a relatively low level and playing back the image at standard image quality. It is beneficial that it can be viewed for a long time.

  The best mode for carrying out each invention will be described below. The relationship between each embodiment and the claims is as follows. The first embodiment will mainly describe claims 1, 2, 3, 7 to 9. The second embodiment will mainly describe claim 4. The third embodiment will mainly describe claims 5 and 6. Note that the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the spirit of the present invention.

  In addition, each functional block described below can be realized as hardware, software that is developed on a memory and controlled by controlling the hardware, or both hardware and software. Specifically, if a computer is used, hardware such as a CPU, a memory, a hard disk drive, a reading drive such as a CD-ROM / DVD-ROM, a transmission / reception port / interface for communication, and other peripheral devices Examples include a configuration unit, a driver program for controlling the hardware, and other application programs.

  Furthermore, the present invention can be realized not only as an apparatus or a system but also as a method. A part of such an invention can be configured as software. Further, a software product used to cause a computer to execute such software, and a recording medium incorporating the product are naturally included in the technical scope of the present invention (the same applies throughout this specification).

  << Embodiment 1 >>

  <Embodiment 1: Overview> An overview of the present embodiment will be described. The present embodiment is an electronic device system including a first electronic device and a second electronic device that can be attached to and detached from each other, and the first electronic device determines an encoding rate of stream information before conversion according to the detection. This is an electronic device system characterized by conversion.

  FIG. 1 shows an example of an electronic apparatus system according to this embodiment. The electronic device system of the present embodiment is composed of two electronic devices. Here, as an example, the first electronic device can display a stand-type expansion device attached to the second electronic device, and the second electronic device can display content. A display is shown. In (a), the first electronic device and the second electronic device are attached, and in (b), they are separated. When the first electronic device and the second electronic device are attached, a high-quality image is displayed on the second electronic device. When the first electronic device and the second electronic device are disconnected, the second electronic device is standard on the second electronic device. An image of quality is displayed. This is because the first electronic device detects attachment / detachment between the electronic devices and converts the encoding rate of the stream information in accordance with this. At this time, the stream information converted by the first electronic device can be reproduced by the second electronic device by acquiring the converted stream information output from the first electronic device by the second electronic device. . When “arrival” is detected, a high-quality image is output without performing conversion, and when “deletion” is detected, conversion is performed with a relatively low encoding rate. Then, the above display form can be realized.

  <Embodiment 1: Configuration> FIG. 2 shows an example of functional blocks of the present embodiment. The “electronic device system” (0200) of this embodiment shown in FIG. 2 includes a “first electronic device” (0210) and a “second electronic device” (0220). Further, the first electronic device (0210) includes an “attachment / detachment detection unit” (0211), a “stream information acquisition unit before conversion” (0212), a “rate conversion unit” (0213), and an “output unit” (0214). And).

    (Electronic Device System 0200) The “electronic device system” includes a “first electronic device” (0210) and a “second electronic device” (0220), which will be described later. The first electronic device and the second electronic device can be attached to and detached from each other.

    (First Electronic Device 0210) “First electronic device” widely includes devices in general such as a stand-type expansion device attached to a second electronic device. Specifically, a display stand provided with a cradle as an attaching / detaching mechanism is applicable. When the second electronic device has a built-in rechargeable battery, the first electronic device supplies power to charge the rechargeable battery when connected to the second electronic device. Next, the configuration requirements of the first electronic device will be described.

    (Attachment / detachment detection unit 0211) The “attachment / detachment detection unit” (0211) detects attachment / detachment between the first electronic device and the second electronic device. “Attached” refers to a state in which an electrical signal path is established, and “departure” refers to a state in which the electrical signal path is disconnected. As an example of the attachment / detachment mechanism between the first electronic device and the second electronic device, a unique docking connector is assumed, but general-purpose connectors (HDMI, USB, IEEE 1394, printer cable, PCI, IDE, etc.) are excluded. It is not a thing. However, when a general-purpose connector is used as the attachment / detachment mechanism, the rate conversion process is executed based on the information of the connection partner, so that a certain processing time may occur and a time lag may occur. On the other hand, when a unique docking connector is used as the attachment / detachment mechanism, the rate conversion process can be executed only by detecting the attachment / detachment signal, so that it can be said that there is little delay due to time lag. In the latter case, in the scene where content is played back and viewed, important scenes are not overlooked, which is highly convenient.

  When connecting between the first electronic device and the second electronic device using a unique docking connector, use one of the docking connectors of each electronic device as an attachment / detachment detection terminal and monitor the terminal voltage. Therefore, it is assumed that the connection state of both electronic devices is detected. FIG. 4 schematically shows the relationship between the voltage and the attachment / detachment state. At this time, “attachment / detachment detection” detects (1) the current connection state (“arrival” or “detachment”), and (2) detects that the connection state has changed. In the case of not identifying, (3) it may be any of the cases in which a change in the connection state is detected and the direction of the change is also identified.

    (Pre-conversion stream information acquisition unit 0212) The “pre-conversion stream information acquisition unit” acquires pre-conversion stream information of a predetermined rate encoding. The stream information is information used for stream reproduction. The stream information can be encoded at a predetermined rate, but the information before execution of the conversion process is referred to as “pre-conversion stream information”.

    The pre-conversion stream information can be acquired by receiving a broadcast via a receiving antenna, a CATV set top box, or the like, or when downloaded and acquired via the Internet or the like, a recording medium (DVD, hard disk, Examples are obtained from a memory card or the like.

    (Rate Conversion Unit 0213) The “rate conversion unit” converts the encoding rate of the acquired pre-conversion stream information according to the detection. In this conversion process, when “attachment” is detected by the attachment / detachment detection unit (0211), conversion is not executed, and when “deletion” is detected, the encoding rate is set as a relative value. An example of such a conversion is as follows. It is assumed that the pre-conversion stream information is high-definition high-definition video information (HD video information), which is converted into standard video information (SD video information). This will be described in a third embodiment described later.

  Another example of the conversion is one that performs compression using a method such as MPEG. For example, as shown in FIG. 5, a method of performing general moving picture coding (a) and further performing low-rate quantization (b) is applicable. Note that the conversion process is not limited to the examples given above, and standard video information (SD video information) is acquired as pre-conversion stream information, and is reversely converted to high-definition high-definition video information (HD video information). May be performed.

    (Output unit 0214) The “output unit” outputs stream information. The stream information to be output may include stream information that is not subjected to rate conversion processing, in addition to stream information that has been subjected to encoding processing at a predetermined rate. As an example of the latter case, it is assumed that a normal analog broadcast is received and output. The output destination of the stream information is mainly assumed to be the second electronic device. However, for example, it does not exclude a form that is directly output to the user by display or voice, or a form that is output to a recording medium (portable recording medium, hard disk, etc.) and stored. This is particularly beneficial when the power supply of the second electronic device is in a standby or OFF state.

    (Second Electronic Device 0220) “Second electronic device” widely includes devices in general that can be connected to the first electronic device. Specifically, a display display unit, a portable terminal device (a portable television, a cellular phone, etc.) corresponds to this. Note that the second electronic device has a built-in rechargeable battery and may be charged by receiving power from the first electronic device. The second electronic device can be used by using the power from the built-in rechargeable battery when not connected to the first electronic device. When connected, the second electronic device is automatically supplied with power through the first electronic device and automatically It can be used while charging the rechargeable battery. (The second electronic device may have a power connection terminal and operate by receiving direct power supply.) In addition, as shown in FIG. As an “output stream information acquisition unit” (0321). This is the only difference from the functional block of FIG.

  (Output Stream Information Acquisition Unit 0321) The “output stream information acquisition unit” acquires stream information output from the output unit (0314) of the first electronic device. Thereby, the stream information can be reproduced by the second electronic device. In addition, since stream information at an appropriate rate can be acquired, processing can be executed immediately, and the processing load on the second electronic device can be reduced.

  Embodiment 1 Hardware Configuration FIG. 6 is a schematic diagram illustrating an example of a hardware configuration according to the present embodiment. The operation of each hardware component in the process execution of the first electronic device will be described using this figure. As shown in this figure, the first electronic device includes “CPU (central processing unit)” (0601), “main memory” (0602), “memory” in order to realize the processing in the rate conversion unit (0213). Device (or storage medium) "(0603). In addition to the above hardware configuration unit, in order to realize the processing in the pre-conversion stream information acquisition unit (0212), the “reception tuner” (0604) and the “input interface” (0605) are connected to the attachment / detachment detection unit (0211). In order to realize the processing in FIG. 4, a “docking connector” (0606) is provided, and in order to realize the processing in the output unit (0214), an “output interface” (0607) is provided. These are connected to each other by a data communication path such as a “system bus” (0608), and perform transmission / reception and processing of information.

  The storage device includes various programs executed by the CPU (for example, a detachment detection result processing program (detachment detection unit), a pre-conversion stream information acquisition program (pre-conversion stream information acquisition unit), and a rate conversion program (rate conversion unit). ), A stream information output program (output unit, etc.). The main memory also provides a work area that is an area for reading and developing the program in order to execute the program stored in the storage device. Furthermore, a plurality of memory addresses are assigned to the main memory and the storage device, respectively, and programs executed by the CPU exchange and process data by specifying and accessing the memory addresses. Is possible. The reception tuner has a function of receiving pre-conversion stream information via an antenna. The pre-conversion stream information may be acquired from the Internet or a recording medium via an input interface. Further, the docking connector detects attachment / detachment with the second electronic device (not shown), and generates a processing instruction for conversion processing. The output interface outputs stream information. The above is the function of each hardware configuration.

  When the first electronic device is turned on, the attachment / detachment detection result processing program (address 01), pre-conversion stream information acquisition program (address 02), rate conversion program (address 03), and stream stored in the storage device An information output program (address 04) is developed in the work area (addresses 11, 12, 13, and 14) of the main memory.

  At this time, the pre-conversion stream information acquisition program developed in the work area of the main memory is executed by the CPU. Thereby, the reception tuner receives the pre-conversion stream information via the antenna, and the received pre-conversion stream information is temporarily held in a data area of the main memory. The pre-conversion stream information may be acquired from the Internet or a recording medium via an input interface.

  Next, one terminal of the docking connector is used as a terminal for detecting attachment / detachment with the second electronic device, and the voltage of the terminal is monitored by the control microcomputer of the first electronic device. The connection state between the electronic devices can be determined based on the voltage value. When the connection state between electronic devices is switched, a processing instruction for conversion processing is generated by the attachment / detachment detection result processing program and stored in address 05 of the storage device.

  Next, the rate conversion program executes the processing instruction stored at the address 05 with the switching of the connection state as a trigger. As a result, the rate conversion is performed on the encoding rate of the pre-conversion stream information once held in the data area of the main memory. At this time, if “arrival” is detected, the conversion may not be performed, and if “deletion” is detected, conversion for relatively reducing the coding rate may be performed. Information indicating these conversion methods and coding rates is included in the processing instructions.

  Finally, the output program outputs stream information via the output interface. When the electronic devices are connected to each other, the docking connector may be used as an output interface. Further, when the electronic devices are not connected to each other, the output is performed wirelessly.

  In the above description, the attachment / detachment detection unit, the pre-conversion stream information acquisition unit, the rate conversion unit, and the output unit are described as being configured by software, but may be configured by hardware.

  <Embodiment 1: Processing Flow> FIG. 7 shows an example of the processing flow of the first electronic device in the electronic device system of the present embodiment. Note that the processing flow shown below can be executed by a method and a program for causing a computer to execute the program, and this program can be recorded on a recording medium readable by the computer. (The same applies to other processing flows in this specification.)

  First, pre-conversion stream information for a predetermined rate encoding is acquired (pre-conversion stream information acquisition step S0701). Next, whether or not the second electronic device is attached / detached is detected, and it is determined whether or not the connection state has been switched (attachment / detachment detection step S0702). In the case of the determination result that the connection state has been switched, the encoding rate of the pre-conversion stream information acquired in the pre-conversion stream information acquisition step (S0701) is converted according to the detection result (rate conversion step S0703). The conversion according to the detection result is, for example, that the conversion is not executed when switching to “arrival” (the encoding rate remains unchanged), and the encoding rate is relatively low when switching to “deletion”. It is assumed that the conversion to be performed is executed. On the other hand, when it is determined that the connection state has not been switched, the attachment / detachment detection step (S0702) may be repeated. Finally, stream information is output (output step S0704).

  <Embodiment 1: Effect> The electronic device system of the present embodiment includes a first electronic device and a second electronic device that can be attached to and detached from each other, and the first electronic device uses the encoding rate of stream information before conversion as described above. It is characterized by conversion according to detection. Depending on whether the electronic device is attached or detached, both high-definition video such as high-definition broadcasting and standard-definition video can be viewed. When the electronic devices are not connected, the battery life of the portable display (second electronic device) can be extended by converting the encoding rate to a relatively low level and playing back the image at standard image quality. It is beneficial that it can be viewed for a long time.

  << Embodiment 2 >>

  <Embodiment 2: Overview> An overview of the present embodiment will be described. In this embodiment, when the attachment / detachment detection unit of the first electronic device detects “arrival”, the output stream information is output in a wired manner, and when “detachment” is detected, the output stream information is wirelessly output. This is an electronic device system characterized by.

  <Embodiment 2: Configuration> FIG. 8 shows an example of functional blocks of the present embodiment. The “electronic device system” (0800) of this embodiment shown in FIG. 8 includes a “first electronic device” (0810) and a “second electronic device” (0820). In addition, the first electronic device (0810) includes an “attachment / detachment detection unit” (0811), a “pre-conversion stream information acquisition unit” (0812), a “rate conversion unit” (0813), and an “output unit” (0814). The output unit (0814) further includes a “wired output unit” (0815) and a “wireless output unit” (0816). The second electronic device (0820) includes an “output stream information acquisition unit” (0821), and the output stream information acquisition unit (0821) includes “wired reception unit” (0822) and “wireless reception unit”. (0823).

  (Wired output unit 0815) The “wired output unit” outputs the output stream information by wire when the attachment / detachment detection unit (0811) detects “arrival”. “Output stream information” refers to stream information to be output, but may include not only converted stream information subjected to conversion processing by the rate conversion unit but also stream information not subjected to conversion processing. In the wired output means, the output stream information mainly corresponds to stream information that is not subjected to conversion processing. “Wired output” refers to output means for transmitting a signal (output stream information) via a cable, a terminal, or the like. When outputting by wire, there is an advantage that even information with a large capacity can be transmitted smoothly. Therefore, stream reproduction is possible even with high-quality video information.

  (Wireless output unit 0816) The “wireless output unit” wirelessly outputs the output stream information when the attachment / detachment detection unit (0811) detects “detachment”. In the wireless output means, the output stream information mainly corresponds to post-conversion stream information that has been converted by the rate conversion unit. “Wireless output” refers to output means for transmitting a signal (output stream information) using radio waves, light, or the like without a cable. Here, it is assumed that output is performed by a spread spectrum method (hereinafter referred to as an SS method), and communication is performed by switching between two frequencies of 2.4 GHz and 5.2 GHz. When outputting wirelessly, it is generally difficult to smoothly transmit information with a large capacity. In other words, stream reproduction is possible with standard-quality video information. Therefore, transmission of down-converted standard image quality is desirable.

  (Wired Receiving Unit 0822) The “wired receiving unit” receives the output stream information output from the wired output unit (0815). By executing the stream reproduction of the received output stream information, it is possible to view a high-quality video.

  (Wireless Receiving Unit 0823) The “wireless receiving unit” receives the output stream information output by the wireless output unit (0816). By executing the stream reproduction of the received output stream information, it is possible to view a standard quality video. Since the second electronic device is detached from the first electronic device and can be carried, it is assumed that the user watches while walking, and it can be said that there is little sense of incongruity even when reproducing standard image quality.

  The processing of each other part is the same as in the first embodiment.

  Second Embodiment Hardware Configuration FIG. 9 is a schematic diagram illustrating an example of a hardware configuration according to the present embodiment. The operation of each hardware component in the process execution of the first electronic device will be described mainly with reference to this diagram, mainly focusing on the differences from the first embodiment. As shown in this figure, the first electronic device has “CPU (central processing unit)” (0901), “main memory” (0902), “memory” to realize the processing in the rate conversion unit (0813). Device (or storage medium) "(0903). In addition to the above hardware configuration unit, in order to realize the processing in the pre-conversion stream information acquisition unit (0812), the “reception tuner” (0904) and the “input interface” (0905) are connected to the attachment / detachment detection unit (0811). In order to realize the processing in the “docking connector” (0906), in order to realize the processing in the output unit (0814), the end of war output means (0815), and the wireless output means (0816), “output” Interface "(0907). These are connected to each other by a data communication path such as a “system bus” (0908), and perform transmission / reception and processing of information.

  One terminal of the docking connector is used as an attachment / detachment detection terminal for the second electronic device, and the terminal voltage is monitored by the control microcomputer of the first electronic device. The connection state between the electronic devices can be determined based on the voltage value. When the connection state between electronic devices is switched, a processing instruction for conversion processing is generated by the attachment / detachment detection result processing program and stored in address 05 of the storage device.

  The output program outputs the output stream information via the output interface, triggered by the switching of the connection state. At this time, when “arrival” is detected, wired output is performed via a docking connector or a system bus, and when “disengagement” is detected, an antenna (not shown) is used. Wireless output.

  Prior to output, the encoding rate of the pre-conversion stream information is converted. For example, the conversion may not be performed when “arrival” is detected, and the conversion may be performed so as to relatively lower the coding rate when “deletion” is detected. Information indicating these conversion methods and encoding rates may be included in the processing instructions.

  Although not shown, the second electronic device includes a receiving unit corresponding to the output unit. That is, when the output stream information is output by wire, it is received via a docking connector or a system bus, and when it is output wirelessly, it is received via an antenna or a receiving circuit. .

  <Embodiment 2: Process Flow> FIG. 10 shows an example of the process flow of the first electronic device in the electronic device system of the present embodiment.

  First, pre-conversion stream information for a predetermined rate encoding is acquired (pre-conversion stream information acquisition step S1001). Next, attachment / detachment of the second electronic device is detected (attachment / detachment detection step S1002). When “deletion” is detected, the encoding rate of the pre-conversion stream information acquired in the pre-conversion stream information acquisition step (S1001) is rate-converted (rate conversion step S1003), and the output stream information is wirelessly output ( Wireless output step S1004). Further, when “arrival” is detected in the attachment / detachment detection step (S1002), the output stream information is wired and output without performing the conversion (wired output step S1005). Finally, it is determined whether or not to end the process (end step S1006). If it is determined that the process is not ended, the process returns to the attachment / detachment detection step (S1002).

  <Embodiment 2: Effect> In the electronic device system of this embodiment, when the attachment / detachment detection unit of the first electronic device detects “arrival”, the output stream information is output by wire to detect “deletion”. If there is, the output stream information is wirelessly output. By outputting the stream information wirelessly, the display (second electronic device) can be removed and content can be viewed at various locations. At this time, when the electronic devices are not connected, the encoding rate is converted to a relatively low level and reproduced with standard image quality. However, since it is portable, the user can walk. It can be said that there is little sense of incongruity even in the reproduction of standard image quality. On the contrary, it is advantageous that the battery life of the portable display display can be extended and the viewing can be performed for a long time.

  << Embodiment 3 >>

  <Embodiment 3: Overview> An overview of the present embodiment will be described. The present embodiment is an electronic device system characterized in that video stream information is acquired as stream information by a first electronic device.

  <Embodiment 3: Configuration> FIG. 11 shows an example of functional blocks of the present embodiment. The “electronic device system” (1100) of this embodiment shown in FIG. 11 includes a “first electronic device” (1110) and a “second electronic device” (1120). In addition, the first electronic device (1110) includes an “attachment / detachment detection unit” (1111), a “pre-conversion stream information acquisition unit” (1112), a “rate conversion unit” (1113), and an “output unit” (1114). In addition, the pre-conversion stream information acquisition unit (1112) includes a “video stream information acquisition unit” (1115). The second electronic device (1120) includes an “output stream information acquisition unit” (1121), and further includes a “display unit” (1122). In addition, although the functional block based on Embodiment 1 (FIG. 3) was shown here, in the case of the functional block based on Embodiment 2 (FIG. 8), it is 1st electronic device as other structural requirements. The output section has “wired output means” and “wireless output means”. Further, the output stream information acquisition unit of the second electronic device has a “wired reception unit” and a “wireless reception unit”.

  (Video Stream Information Acquisition Unit 1115) The “video stream information acquisition unit” acquires video stream information as stream information. “Video stream information” refers to information used to play a video stream. The video stream information may include HD video information such as high-definition broadcast and standard definition SD video information. When the video stream information acquisition unit is configured to acquire HD video information as pre-conversion stream information, the rate conversion unit (1113) converts the pre-conversion stream information that is HD video information into SD video information. Convert to

  (Display unit 1122) The “display unit” performs processing for displaying the video stream information acquired from the output stream information acquisition unit (1121). When the video stream information is HD video information, a high-quality video for HD is displayed, and when the video stream information is SD video information, a standard-quality video for SD is displayed.

  The processing of other parts is the same as in the first and second embodiments.

  <Third Embodiment: Hardware Configuration> FIG. 12 is a schematic diagram illustrating an example of a hardware configuration of the present embodiment. The operation of each hardware component in the processing execution of the first electronic device will be described mainly with reference to this figure, mainly focusing on the differences from the first and second embodiments. As shown in this figure, the first electronic device includes a “CPU (central processing unit)” (1201), a “main memory” (1202), and a “memory” in order to realize processing in the rate conversion unit (1113). Device (or storage medium) "(1203). In addition to the above hardware configuration unit, in order to realize processing in the pre-conversion stream information acquisition unit (1112) and the video stream information acquisition unit (1115), a “reception tuner” (1204), “input interface” ”(1205),“ docking connector ”(1206) for realizing the processing in the attachment / detachment detection unit (1111), and“ output interface ”(1207) for realizing the processing in the output unit (1114). Prepare. These are connected to each other through a data communication path such as a “system bus” (1208), and perform transmission / reception and processing of information.

  First, when the first electronic device is turned on, the pre-conversion stream information acquisition program (address 02) stored in the storage device is expanded in the work area (address 12) of the main memory. At this time, the developed pre-conversion stream information acquisition program is executed by the CPU, and the reception tuner receives the pre-conversion stream information via the antenna. The pre-conversion stream information received here is video stream information, and the received video stream information is temporarily held in a data area or the like of the main memory. At this time, it is assumed that the video stream information is HD video information. Note that the video stream information may be acquired from the Internet or a recording medium via an input interface.

  Next, one terminal of the docking connector is used as an attachment / detachment detection terminal of the second electronic device, and the voltage of the terminal is monitored by the control microcomputer of the first electronic device. The connection state between the electronic devices can be determined based on the voltage value. When the connection state between the electronic devices is switched, a processing instruction for rate conversion processing is generated by the attachment / detachment detection result processing program and stored in the address 05 of the storage device.

  Next, the rate conversion program executes the processing instruction held at the address 05 with the switching of the connection state as a trigger. Thereby, the encoding rate of the video stream information once held in the data area of the main memory is converted. At this time, the pre-conversion stream information that is HD video information is converted into SD video information through an image quality conversion circuit. Information indicating these conversion methods and coding rates is included in the processing instructions. Finally, the output program outputs stream information via the output interface.

  Although not shown, the second electronic device includes an acquisition unit that acquires the output video stream information. For example, when the output stream information is output by wire, it is received via a docking connector or a system bus, and when it is output wirelessly, it is received via an antenna or a receiving circuit. . The acquired video stream information is displayed on the display.

  <Third Embodiment: Process Flow> FIG. 13 shows an example of a process flow of the first electronic device in the electronic device system of the present embodiment.

  First, video stream information (HD video information) is acquired as pre-conversion stream information of a predetermined rate encoding (video stream information acquisition step S1301). Next, attachment / detachment of the second electronic device is detected (attachment / detachment detection step S1302). When “deletion” is detected, the encoding rate of the video stream information, which is the HD video information acquired in the video stream information acquisition step (S1301), is converted into SD video information (conversion step S1303) and wirelessly output. (Wireless output step S1304). If “arrival” is detected in the attachment / detachment detection step (S1302), the video stream information is output in a wired manner without performing rate conversion (wired output step S1305). Finally, it is determined whether or not to end the process. If not, the process may return to the attachment / detachment detection step (S1302).

  <Embodiment 3: Effect> The electronic device system of the present embodiment is characterized in that video stream information is acquired as stream information by the first electronic device. The HD video information is acquired as the video stream information, and the HD video information is converted into SD video information when executing the conversion process. There is an advantage that both high-quality HD video and standard-quality SD video can be viewed.

Conceptual diagram for explaining the first embodiment The figure which showed an example of the functional block of Embodiment 1. The figure which showed another example of the functional block of Embodiment 1. The figure explaining the detection of attachment / detachment in Embodiment 1. The figure explaining the example of rate conversion in Embodiment 1. The figure which showed an example of the hardware constitutions of Embodiment 1. The figure which showed the flow of the process of Embodiment 1. The figure which showed an example of the functional block of Embodiment 2. The figure which showed an example of the hardware constitutions of Embodiment 2. The figure which showed the flow of the process of Embodiment 2. The figure which showed an example of the functional block of Embodiment 3. The figure which showed an example of the hardware constitutions of Embodiment 3. The figure which showed the flow of the process of Embodiment 3.

Explanation of symbols

0200 Electronic device system 0210 First electronic device 0211 Attachment / detachment detection unit 0212 Pre-conversion stream information acquisition unit 0213 Rate conversion unit 0214 Output unit 0220 Second electronic device

Claims (9)

An electronic device system comprising a first electronic device and a second electronic device that are detachable from each other,
The first electronic equipment
An attachment / detachment detection unit for detecting the attachment / detachment;
A pre-conversion stream information acquisition unit that acquires pre-conversion stream information of a predetermined rate encoding;
A rate conversion unit that converts the encoding rate of the acquired pre-conversion stream information according to the detection;
An output unit for outputting stream information;
An electronic device system.   The electronic device system according to claim 1, wherein the second electronic device has an output stream information acquisition unit that acquires stream information output from the output unit of the first electronic device. The rate converter
If the attachment / detachment detection unit detects "arrival", no conversion is performed.
The electronic device system according to claim 1 or 2, wherein when the attachment / detachment detection unit detects "detachment", conversion for relatively reducing the encoding rate is executed. The output part of the first electronic device is
When the attachment / detachment detection unit detects “arrival”, wired output means for outputting output stream information by wire;
A wireless output means for wirelessly outputting the output stream information when the attachment / detachment detection unit detects “detachment”;
The output stream information acquisition unit of the second electronic device
The electronic device system according to claim 3, further comprising a wired receiving unit and a wireless receiving unit respectively corresponding to the wired output unit and the wireless output unit. The pre-conversion stream information acquisition unit of the first electronic device has video stream information acquisition means for acquiring video stream information as stream information,
The second electronic device has a display unit for displaying the video stream information acquired from the output stream information acquisition unit, and any one of claims 2, 3 or 4 dependent on claim 2 The electronic device system described in 1. The video stream information acquisition means is configured to acquire HD video information as pre-conversion stream information,
The electronic device system according to claim 5, wherein the rate conversion unit is configured to convert pre-conversion stream information, which is HD video information, into SD video information.   The electronic device system according to any one of claims 1 to 6, wherein the first electronic device is a display stand including a cradle as an attaching / detaching mechanism, and the second electronic device is a display unit. The second electronic device has a built-in rechargeable battery,
The electronic device system according to any one of claims 1 to 7, wherein the first electronic device includes a charging circuit unit that charges the rechargeable battery when the attachment / detachment detection unit detects "arrival". In an electronic device system comprising a first electronic device and a second electronic device that can be attached to and detached from each other,
In the stream information conversion processing method by the first electronic device,
Pre-conversion stream information acquisition step of acquiring pre-conversion stream information of a predetermined rate encoding;
Attaching / detaching detection step for determining whether attachment / detachment with the second electronic device is detected and the connection state is switched,
In the case of a determination result that the connection state has been switched, a rate conversion step for rate-converting the encoding rate of the pre-conversion stream information acquired in the pre-conversion stream information acquisition step;
An output step for outputting stream information;
A conversion processing method.

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