JP2008042928A - Converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To connect multiple digital and analog devices to a media converter and transmit data between the devices required. <P>SOLUTION: A data conversion system 10 connects analog devices such as a back camera 12 and a left-hand camera 13 to a plurality of analog ports 21 to 24 of a media converter 11 and connects digital devices such as a DVD device 16 and a digital monitor 17 to a first digital port 11a. When data is transmitted from an analog device to a digital device, a channel number assigned to each of the analog ports 21 to 24 is used. When data is transmitted form a digital device to an analog device, an analog port to be used is selected based on a selection signal from the digital device or a change-over switch 37 of the media converter 11 for data transmission path control. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a conversion device that connects an analog device and a digital device and converts the data into a format that allows data to be used between the devices, and more particularly, to improve the usability of a system by connecting a plurality of analog devices. It is.

  Conventionally, when using data of a digital device such as a DV camera and a portable personal computer brought into the vehicle with an analog device such as an analog monitor mounted on the vehicle, the digital device and the analog device are generally directly connected. Since they cannot be connected, there are cases in which both are connected by a media converter capable of digital and analog conversion.

  FIG. 8 shows a conventional in-vehicle data conversion system 1 centering on the media conversion device 2. The media conversion device 2 has two digital ports 2a and 2b for connecting a digital device and one analog port 2c for connecting an analog device, and an in-vehicle analog monitor 6 is connected to the analog port 2c. Connected with an analog cable 7.

  In addition, the media conversion device 2 has a specification related to digital data based on IEEE 1394, and a daisy chain method of connecting a DV camera 4 and portable personal computer data 5 of an external device to the digital port 2a via communication cables 3a and 3b. Are connected to form a communication bus 3.

Therefore, when the moving image data of the DV camera 4 brought into the vehicle is displayed on the in-vehicle analog monitor 6 in the data conversion system 1, the digital moving image data sent from the DV camera 4 is converted into the analog moving image data by the media conversion device 2. The converted data is sent to the analog monitor 6. A system for connecting on-vehicle devices is also disclosed in Patent Document 1 below.
JP 2002-152244 A

  In recent years, in addition to external digital devices brought into the vehicle, the number of digital devices mounted on vehicles from the beginning as on-vehicle devices is increasing. On the other hand, analog devices are still mounted on the vehicle, and the digital device and the analog device are mixed in the vehicle. In order to mutually use the data of each device between these devices, it is necessary to connect a plurality of digital devices and a plurality of analog devices and to be able to send and receive data between the required devices.

  However, as described above, the conventional media conversion device 2 supports connection of a plurality of digital devices, but since only one analog device can be connected, a plurality of digital devices and a plurality of analog devices can be connected. There is a problem that it cannot be done. Therefore, the connection between a plurality of digital and analog devices in the vehicle described above cannot be handled by a conventional system centered on the media conversion device 2.

  Further, even when it is assumed that a plurality of digital devices and a plurality of analog devices can be connected, data transmission between each device is disturbed, so that it is expected that data transmission between specific devices becomes difficult.

  The present invention has been made in view of such circumstances, and a conversion device that improves the usability of data possessed by each device by enabling a plurality of digital devices and a plurality of analog devices to be connected by a media conversion device. The purpose is to provide. It is another object of the present invention to provide a conversion device that can reliably transmit data between specific devices even when a plurality of analog devices are connected.

  The conversion device according to the first invention is connected to a digital device and an analog device, and is an in-vehicle conversion device that performs A / D conversion and / or D / A conversion of data, and connects a plurality of analog devices. A plurality of connection units each assigned a unique number for sending and / or receiving analog data, and a connection that receives analog data from which the data has been converted into digital data that has undergone A / D conversion A number adding means for adding a unique number of each section, and a sending means for sending digital data to which the number adding means has added a unique number to each digital device in which the unique number is set. The digital device set with the unique number that matches the unique number added to the digital data is made to acquire the digital data sent by the sending means. It characterized that you have.

  A conversion device according to a second invention is connected to a digital device and an analog device, and is an in-vehicle conversion device that performs A / D conversion and / or D / A conversion of data, and the digital device is connected via a communication cable. A plurality of connection units connected to each other to connect and send out analog data and / or receive analog data; detection means for detecting the bandwidth of the communication cable; and the detection means And connecting portion blocking means for blocking any of the plurality of connecting portions when there is no available bandwidth.

  A conversion device according to a third aspect of the invention is connected to a digital device and an analog device, and is an in-vehicle conversion device that performs A / D conversion and / or D / A conversion of data, and connects a plurality of analog devices. A plurality of connection units for sending and / or receiving analog data; a connection unit selecting means for selecting a connection unit for sending and / or receiving analog data from the plurality of connection units; Signal receiving means for receiving a selection signal for selecting any one of the connection sections from the digital device, and the connection section selecting means selects the connection section based on the selection signal received by the signal receiving means. It is made to do so.

  In the first invention, a plurality of analog devices are connected to the conversion device by providing an in-vehicle conversion device such as a media conversion device capable of connecting a plurality of digital devices with a connection portion for the plurality of analog devices. Thus, it is possible to connect a plurality of digital devices and a plurality of analog devices. As a result, the data held by each device can be used effectively between the devices.

  Furthermore, in the first invention, digital data to which a unique number assigned to each connection unit is added is transmitted from the conversion device, and the digital device discards the received digital data according to the set unique number. Therefore, even if a plurality of analog devices are connected to the conversion device, data can be reliably transmitted from the required analog device to the required digital device. Note that such a unique number corresponds to, for example, a channel number in the case of isochronous transfer (synchronous transfer) according to IEEE 1394, and the digital device adds a channel number to a packet for transmitting data, so that the digital device adds the packet number to the packet. Based on the added channel number, desired data can be acquired from a plurality of data flowing through the communication bus.

  In the second invention, the conversion device detects the bandwidth of the communication cable connecting the digital device to the in-vehicle conversion device, and if there is no available bandwidth, any one of the connection portions is cut off. Even when a large amount of data is transmitted from an analog device, it is possible to prevent a situation in which data overflows from the communication bus on the digital device side. In addition, the connection part to be blocked is determined according to the data amount, and depending on the data amount, a plurality of connection parts may be blocked. You may make it interrupt | block in order from the connection part which receives.

  In the third invention, the connection part selection means selects the connection part by a signal such as a command for selecting the connection part. On the basis of the connection part selection signal sent from the digital device, By selecting the connection unit with the conversion device, the connection unit used in the digital device can be selected, and the convenience of the system can be improved. Note that the digital device may send the selection signal alone to the conversion device, or may send the selection signal together with the data to be sent.

  When a communication bus including a digital device is formed based on IEEE 1394, a selection signal is transmitted as a packet. In IEEE 1394, a packet is sent to all digital devices included in the communication bus with a destination added, and each digital device receives the packet once, and then the received packet is self-defined based on the added destination. Determine whether it is addressed. If it is addressed to itself, the digital device acquires the accepted packet. If it is not addressed to itself, the digital device discards the accepted packet.

  In the first invention, by providing a plurality of analog device connection portions in the in-vehicle conversion device, it is possible to realize connection between a plurality of digital and analog devices and to improve data usability. Furthermore, since the conversion device adds the unique number of each connection part and sends out digital data, the digital device can select the digital data based on the added unique number, and even if a large number of devices are connected, a specific data can be selected. Data can be transmitted between devices.

  In the second invention, since the in-vehicle conversion device detects the bandwidth of the communication cable connecting the digital device, when the data overflows due to a large amount of data transmission, the conversion device is cut off by disconnecting the required connection portion. Can limit the amount of analog data that can be accepted, and maintain a good data transmission situation.

  In the third invention, since the in-vehicle conversion device selects the connection unit based on the selection signal transmitted by the digital device, the connection unit to be used can be selected from the digital device, and the phase direction of the digital device and the analog device The convenience of the system can be improved with respect to data transmission.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 shows a data conversion system 10 built in a vehicle S according to an embodiment of the present invention. The data conversion system 10 includes a media conversion device 11, a plurality of in-vehicle analog devices such as a back camera 12, a left camera 13, an analog monitor 14 and an analog video device 15, a DVD device 16, a digital monitor 17, a DV camera 18, and the like. A plurality of digital devices compatible with IEEE 1394 such as a portable personal computer 19 are connected. Each digital device is daisy chained by communication cables 25a to 25d, and an IEEE1394 communication bus 25 is formed as a whole.

  The media conversion device 11 according to the present embodiment corresponds to a conversion device that performs A / D conversion and D / A conversion of data. As shown in FIG. 2, a total of four connection units for connecting analog devices are provided. Analog ports 21 to 24 are provided. Each of the analog ports 21 to 24 is assigned a channel number as a unique number. The first analog port 21 has a channel number “1”, the second analog port 22 has a channel number “2”, and a third analog port 23. Is assigned a channel number “3”, and the fourth analog port 24 is assigned a channel number “4”.

  Each of the analog ports 21 to 24 has the same configuration, and has a total of four terminals according to the type of analog data and the data transmission / reception direction. Each terminal will be described with respect to the first analog port 21. An image input terminal 21a, an image output terminal 21b, an audio output terminal 21c, and an audio input terminal 21d are provided in order from the top. An analog cable from the analog device is connected to any or all of the terminals 21a to 24d of each analog port 21 to 24 according to the function of the analog device itself.

  For example, since the back camera 12 connected to the first analog port 21 outputs image data obtained by imaging the rear of the vehicle S, the back camera 12 is connected to the image input terminal 21a of the first analog port 21 by the analog cable 26a. Image data is sent to the media converter 11.

  Other analog devices are also connected according to the function of each device, and the left camera 13 that captures the left side of the vehicle S and outputs image data is analog to the image input terminal 22a of the second analog port 22. They are connected by a cable 26b. The analog monitor 14 that displays the received image data is connected to the image output terminal 23b of the third analog port 23 by an analog cable 26c. Further, the analog video device 15 that inputs and outputs image data and audio data is connected to each terminal 24a to 24d of the fourth analog port 24 by an analog cable 26d configured by bundling a total of four signal lines. Yes.

  2, the media converter 11 includes an A / D / D / A converter LSI 30, a link control LSI 31, an image SDRAM 32, a PHY LSI 33, a CPU 34, an SDRAM 35, a FROM 36, a changeover switch 37, and a power supply circuit. 38. Since the media conversion device 11 has a specification corresponding to IEEE 1394, the link control LSI 31 and the file LSI 33 perform processing related to digital data based on the specification of IEEE 1394.

  The A / D / D / A conversion LSI 30 is connected to each of the analog ports 21 to 24 described above, and A / D conversion of analog data received by the analog ports 21 to 24 and a digital device send it out. D / A conversion of digital data is performed. Further, when A / D conversion is performed, the A / D / D / A conversion LSI 30 functions as a number adding unit, and the analog data that is the conversion source of the digital data is received in the A / D converted digital data. The port channel number is added.

  For example, “1” that is the channel number of the first analog port 21 is added to the digital data A / D converted from the analog data received from the first analog port 21. In IEEE 1394, since digital data is transmitted in packets, the channel number is added to the channel number area in the digital data packet to be transmitted.

  Further, when D / A conversion is performed, the A / D / D / A conversion LSI 30 passes the converted digital data through one of the selected analog ports 21 to 24 based on the control of the CPU 34 as will be described later. A function of outputting and a function of individually blocking each of the analog ports 21 to 24 are provided.

  In addition, the link control LSI 31 is connected to the A / D / D / A conversion LSI 30 and the phi LSI 33 and performs processing for controlling the flow of data inside the media conversion device 11 and also converts the format of digital data. Specifically, the link control LSI 31 transmits the digital data converted by the A / D / D / A conversion LSI 30 to the phi LSI 33 in parallel, while the digital data of the digital device received by the phi LSI 33 is A / D. Transmit in parallel to the D / A conversion LSI 30.

  The link control LSI 31 according to the present embodiment has a specification based on IEEE 1394. When the digital data received from the phi LSI 33 is a 1394 image format such as the DV format, the 1394 image format is converted to a general digital video. Convert to signal format. Further, the A / D converted digital data is converted in the reverse direction. The image SDRAM 32 connected to the link control LSI 31 temporarily stores data related to various processes in the link control LSI 31.

  The phi LSI 33 is connected to the first and second digital ports 11a and 11b provided in the media conversion device 11, and sends out digital data packets to which channel numbers are added and digital data from each digital device. Functions as a receiving means for receiving the packet. The phi LSI 33 also functions as a signal receiving unit that receives a packet to which a connection unit selection signal sent from a digital device such as a DVD device 16 and a digital display 17 described later is added. The received signal is transmitted to the CPU 34. I am doing so.

  Further, since the data is serially transmitted through the IEEE 1394 communication bus 25, the phi LSI 33 converts the serial data received by the digital ports 11a and 11b into a parallel state and also receives the parallel data received from the link control LSI 31. The process of converting the data into a serial state is also performed.

  As shown in FIG. 3, the changeover switch 37 has first to fourth switch portions 37a to 37d corresponding to the analog ports 21 to 24, and is independent for each of the switch portions 37a to 37d. To turn it on / off. Note that such an on / off setting state is transmitted to the CPU 34.

  When each switch unit 37a to 37d is on, analog data can be transmitted / received or transmitted / received at each corresponding analog port 21 to 24, and when each switch unit 37a to 37d is off, it corresponds The analog ports 21 to 24 that are to be cut off are made unusable. Therefore, in the state illustrated in FIG. 3, only the second switch portion 37b is off, so that the second analog port 22 is blocked and the other analog ports 21, 23, and 24 can be used. ing.

  Further, the CPU 34 illustrated in FIG. 2 functions as a connection unit selection unit, a detection unit, and a connection unit blocking unit in addition to the overall control of the media conversion apparatus 11. The connection unit selection means of the CPU 34 is used based on the state of each of the switch units 37a to 37d of the changeover switch 37 described above and a selection signal sent from a digital device connected to the media conversion device 11 as will be described later. The analog ports 21 to 24 are selected.

  When the analog ports 21 to 24 are selected based on the changeover switch 37, the connection unit selection unit selects each analog in the A / D / D / A conversion LSI 30 based on the on / off state of each switch unit 37a to 37d. Control processing for selecting a port to be used from the ports 21 to 24 is performed. When selecting an analog port based on a signal from a digital device, the DVD device 16 and the digital display 17 shown in FIG. 1 can send a selection signal as will be described later. Control processing of the A / D / D / A conversion LSI 30 is performed so as to select an analog port to be used based on the above.

  Moreover, the detection means of CPU34 detects the bandwidth of each communication cable 25a-25d of the communication bus 25. FIG. Since the communication bus 25 is constructed based on IEEE1394, any one of the digital devices from the DVD device 16 to the personal computer 19 functions as an IRM (Isochronous Resource Manager) in IEEE1394.

  Since the digital device functioning as the IRM manages the resources of the communication bus 25 as needed and stores the management contents in its own memory, the bandwidth of each communication cable 25a to 25d also has the bandwidth of the IRM digital device. It is stored in a specific register (Band Width Register) in the memory. Therefore, the detection means of the CPU 34 detects the bandwidth by confirming the value of this register, and the CPU 34 determines whether the bandwidth is currently free or free from the detected bandwidth value. Judgment is made from time to time.

  Further, the connection block blocking means of the CPU 34 performs A / D / D / A conversion when there is no vacancy in the bandwidth detected by the detection means, that is, when a large amount of data flows through the communication bus 25 and there is no room. Control is performed to block any of the analog ports 21 to 24 with respect to the LSI 30. The analog ports 21 to 24 to be blocked can be selected at any time by the CPU 34 according to the amount of data flowing through the analog ports 21 to 24 and the importance of the data, and a plurality of analog ports can be simultaneously blocked. ing.

  Also, the SDRAM 35 shown in FIG. 2 temporarily stores data and files related to the processing control of the CPU 34, and the FROM 36 serves as various means such as the above-described connection part selection means and connection part blocking means. It stores the program to function. Further, the power supply circuit 38 supplies power (+ B, ACC) from the battery 40 to various LSIs such as the link control LSI 31 of the media conversion device 11 and the CPU 34 according to the key position of the ignition switch 39.

  On the other hand, in the digital device such as the DVD device 16 and the digital monitor 17 shown in FIG. 1, the DVD device 16 and the digital monitor 17 are in-vehicle devices, and the DV camera 18 and the personal computer 19 are brought into the vehicle S from outside and connected. It corresponds to the external equipment.

  Each digital device transmits and receives digital data in packets based on IEEE 1394, number setting means for setting a channel number for selecting whether or not to receive a received packet, and a number for detecting the channel number of the received packet When the detected channel number and the set channel number are the same, the detection unit is provided with a data acquisition unit that acquires digital data of this channel number. Furthermore, each digital device of the present embodiment also includes signal transmission means for transmitting a selection signal corresponding to a command for selecting the analog ports 21 to 24 used in the media conversion device 11.

  Specifically, each means described above in the DV camera 18 shown in FIG. 4 will be described. The DV camera 18 includes a control unit 18d including a 1394 I / F (interface) unit 18c connected to connection ports 18a and 18b to which communication cables 25c and 25d of the communication bus 25 are connected, a CPU, a ROM, a RAM, and the like. And the setting operation part 18e connected with the control part 18d is provided.

  The 1394 I / F unit 18c functions as the above-described detection unit, data acquisition unit, and signal transmission unit while transmitting and receiving packets. That is, the detecting means detects the channel number added to the received packet, and transmits the detected channel number to the control unit 18d. Further, as the data acquisition means, the packet received under the control of the control unit 18d is acquired. Further, a command selection signal for selecting the analog ports 21 to 24 used by the media conversion device 11 is transmitted as a signal transmission means under the control of the control unit 18d.

  In addition, the setting operation unit 18e enables setting operation of channel numbers of the analog ports 21 to 24 through which analog data received by the DV camera 18 passes as number setting means, and further, an analog port used in the media conversion device 11 The selection operation of 21-24 is also enabled. The setting operation unit 18e is provided with operation switches and buttons (not shown) corresponding to these operations, and the operated contents are transmitted to the control unit 18d.

  The control unit 18d determines whether or not the channel number of the packet detected by the 1394 I / F unit 18c and the channel number set by the setting operation unit 18e are the same, and if they are the same, acquires the received packet. In addition, if they are different, the 1394 I / F unit 18c is controlled so as to discard the received packet. Further, the control unit 18d generates a selection signal for selecting the analog ports 21 to 24 to be used in response to the setting operation performed by the setting operation unit 18e, and transmits the selection signal in a packet so as to transmit the selection signal in a packet. The F unit 18c is controlled.

  Next, a series of processing when data is transmitted from a digital device to an analog device in the data conversion system 10 configured as described above will be described. There are two methods for performing this processing based on the selection signal and on the basis of the changeover switch. The processing based on the selection signal is transmitted to the analog monitor 14 from the DV camera 18 digital data. An example of the display will be described based on the first flowchart shown in FIG.

  First, a packet of digital data carrying a selection signal for selecting the third analog port 23 of the media conversion device 11 by operating the DV camera 18 is sent from the DV camera 18 to the media conversion device 11 (S1). Further, the media conversion device 11 receives packets from each digital device connected to the communication bus 25 as needed (S2).

  Next, the media conversion device 11 determines whether or not the received packet is addressed to itself (S3). If the packet is not addressed to itself (S3: NO), the received packet is discarded (S4), and the process returns to the stage of accepting the packet (S2). If the packet is addressed to itself (S3: YES), the media conversion device 11 determines whether or not there is a selection signal in the packet (S5).

  If there is no selection signal (S5: NO), the received packet is acquired by itself without being sent to another device, and the process returns to the stage of receiving the packet (S2). If there is a selection signal (S5: YES), the media converter 11 selects the third analog port 23 based on the selection signal (S6), and converts the received packet digital data into a general format. Then, it is converted into analog data, and this analog data is sent out from the selected third analog port 23 (S7). The sent analog data is received and displayed by the analog monitor 14 (S8).

  As described above, the data conversion system 10 according to the present embodiment enables a plurality of analog devices to be connected to the media conversion device 11 and also transfers data of a certain digital device from a plurality of analog devices to a specific analog device. It can be transmitted reliably.

  Further, processing related to data transmission by the changeover switch 37 will be described below by taking as an example a case where data is transmitted from the DV camera 18 to the analog monitor 14. When processing is performed by the changeover switch 37, the selection signal is not transmitted from the digital device, and the media conversion apparatus 11 does not determine the presence or absence of the selection signal.

  First, before transmitting data, in the media conversion device 11, only the third switch portion 37c of the changeover switch 37 is turned on and the other switch portions 37a, 37b, and 37d are turned off, and only the third analog port 23 is set. To make the data pass. When digital data is sent from the DV camera 18 to the media converter 11 in such a state, the analog data converted by the media converter 11 is sent to the analog monitor via the third analog port 23 through which data can only pass. 14 is transmitted.

  In the above-described data transmission, digital data is transmitted from the DV camera 18 as a digital device. However, other digital devices such as the DVD device 16 and the digital monitor 17 also pass through the media conversion device 11. Data can be transmitted from a plurality of analog devices to a specific analog device.

  On the other hand, when data transmission is performed next from an analog device to a digital device, the data conversion system 10 can cope with a method based on a channel number, a method based on a selection signal, and three processing methods using a changeover switch 37. Of these methods, first, a case where the image data captured by the back camera 12 shown in FIG. 1 is transmitted to the digital monitor 17 and displayed by the method based on the channel number will be described with reference to the second flowchart of FIG. To do.

  First, the digital monitor 17 is operated to set the channel number of the acquired packet to “1” of the channel number of the first analog port 21 to which the back camera 12 is connected (S10). In this state, analog data of an image taken from the back camera 12 is sent out (S11). The sent analog data is received by the first analog port 21 of the media converter 11 and converted into digital data of 1394 format by the media converter 11 (S12), and a channel number is added to the converted digital data packet. Then, it is sent out from the first digital port 11a (S13).

  Packets from other digital devices are also transmitted on the communication bus 25, and these transmitted packets are accepted at any time by the digital monitor 17 (S14), and the channel number of the received packet is the same as the set channel number. Is determined (S15). If both channel numbers are not the same (S15: NO), it is determined that the packet is not from the back camera 12, the packet is discarded (S16), and the process returns to the step of accepting a new packet (S14).

  On the other hand, if both channel numbers are the same (S15: YES), it is determined that the received packet is from the back camera 12, this packet is acquired, and the digital data of the packet is displayed on the digital monitor 17. (S17). As described above, by selecting packets based on the channel number, the digital device connected to the communication bus 25 can acquire data of a required analog device from a plurality of analog devices.

  In this process based on the channel number, even if a plurality of analog devices transmit data simultaneously, the data of a specific analog device can be acquired by the digital device, but the bandwidth of the communication bus 25 is reduced by transmitting a large amount of data. There may be a shortage. In such a case, the media conversion device 11 detects the bandwidth of the communication bus 25, and when there is no available bandwidth, any one of the analog ports 21 to 24 is shut off. Can be maintained well.

  A case where the image data of the analog video device 15 is transmitted to the digital monitor 17 and displayed by the processing based on the selection signal will be described with reference to the third flowchart of FIG.

  First, the digital monitor 17 sends a selection signal for selecting the fourth analog port 24 to which the analog video device 15 is connected to the media conversion device 11 in a packet (S20). The media conversion device 11 accepts a packet transmitted from the communication bus 25 at any time (S21), and determines whether the received packet is addressed to itself (S22). If the packet is not addressed to itself (S22: NO), the packet is discarded (S23), and the process returns to the step of accepting a new packet (S21).

  On the other hand, when the packet is addressed to itself (S22: YES), the media conversion apparatus 11 determines whether or not the packet has a selection signal (S24). If there is no selection signal (S24: NO), the process returns to the step of accepting a packet (S21), and a loop state is entered until a packet with a selection signal is accepted.

  On the other hand, when there is a selection signal in the packet (S24: YES), the media converter 11 selects an analog port to be used based on the received selection signal (S25). In this case, the fourth analog port 24 is selected by the selection signal sent out by the digital monitor 17 described above. The other analog ports 21 to 23 that are not selected are controlled so that the media conversion device 11 is blocked and analog data is not accepted.

  After selecting the analog port, the media conversion device 11 determines whether or not analog data of the analog video device 15 is received from the selected analog port (fourth analog port 24) (S26). When analog data is not received (S26: NO), a loop state in which data is waited until analog data is received is entered.

  If analog data is received from the analog video device 15 (S26: YES), the media conversion device 11 A / D converts the received analog data with the channel number of the fourth analog port 24 (S27), The A / D converted digital data is converted into a 1394 format (S28). Thereafter, the media conversion device 11 continuously sends digital data in 1394 format to the communication bus 25 (S29).

  The sent digital data is acquired based on the channel number preset in the digital display 17, and the acquired data is displayed (S30). In this way, by sending a selection signal from a digital device and selecting an analog port to be used, the digital device acquires data of a specific analog device even if a plurality of analog devices are connected to the media conversion device 11. can do.

  In addition, by selecting data that the media conversion device 11 receives according to the selection signal, it is possible to prevent a situation in which the data transmission path is restricted and a large number of analog data is simultaneously received by the media conversion device 11 from a large number of analog devices. As a result, the data to be transmitted is organized and smooth data transmission can be realized.

  Finally, a process of selecting analog device data received by the digital device by operating the changeover switch 37 of the media conversion device 11 will be described in the case where the analog image data of the left camera 13 is recorded by the DVD device 16. First, before transmitting data, an operation of turning on only the second switch portion 37b of the changeover switch 37 of the media conversion device 11 is performed.

  By doing so, the media conversion device 11 can use only the second analog port 22 and accepts only analog data from the left camera 13. In addition, the DVD device 16 is previously set to the channel number of the second analog port 22.

  Next, after receiving the analog data, the media conversion device 11 sends the digital data that has undergone A / D conversion and conversion to the 1394 format to the communication bus 25 in the same manner as described above, and the sent digital data. Data is acquired and recorded by the DVD device 16 based on the channel number. By narrowing down the analog data received by the media conversion device 11 by operating the changeover switch 37 in this way, it is possible to eliminate a situation where the communication bus 25 is congested with data from analog devices, and to form an efficient data transmission environment. . In the three methods described above, data can be transmitted in a similar manner other than between the devices described above.

  In addition, the present invention is not limited to the above-described form, and the selector switch 37 of the media conversion device 11 can be omitted when each analog port is basically selected using only a selection signal. . In addition, when switching to each analog port is basically performed by operating the changeover switch 37, portions relating to transmission, reception, and determination of a selection signal may be omitted from each digital device and the media conversion device 11.

1 is an overall configuration diagram of a data conversion system according to an embodiment of the present invention. It is an internal block diagram of a media converter. It is the schematic of a changeover switch. It is a schematic block diagram of a DV camera. It is a 1st flowchart which shows the process in the case of transmitting data from a digital device to an analog device. It is a 2nd flowchart which shows the process in the case of transmitting data from an analog apparatus to a digital apparatus based on a channel number. It is a 3rd flowchart which shows the process in the case of transmitting data from an analog apparatus to a digital apparatus based on a selection signal. It is a whole block diagram of the conventional data conversion system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Data conversion system 11 Media converter 12-15 Analog equipment 16-19 Digital equipment 21-24 Analog port 25 Communication bus 30 A / D / D / A conversion LSI
31 Link control LSI
33 Phi LSI
34 CPU
37 changeover switch S vehicle

Claims (3)

In-vehicle conversion device connected to digital equipment and analog equipment and performing A / D conversion and / or D / A conversion of data,
A plurality of connection units each having a unique number assigned to each of a plurality of analog devices connected to send and / or receive analog data;
Number adding means for adding, to the digital data that has undergone A / D conversion, a unique number of the connection unit that received the analog data from which the data was converted;
Sending means for sending the digital data to which the unique number is added to the digital device to which the unique number is set, respectively,
A digital device in which a unique number that matches a unique number added to digital data sent by the sending means is set to acquire digital data sent by the sending means. Conversion device. In-vehicle conversion device connected to digital equipment and analog equipment and performing A / D conversion and / or D / A conversion of data,
The digital device is connected via a communication cable,
A plurality of connection portions for connecting and transmitting analog data by connecting the plurality of analog devices respectively; and
Detecting means for detecting the bandwidth of the communication cable;
A conversion device comprising: a connection section blocking means for blocking any of the plurality of connection sections when there is no available bandwidth detected by the detection section. In-vehicle conversion device connected to digital equipment and analog equipment and performing A / D conversion and / or D / A conversion of data,
A plurality of connecting portions for connecting and transmitting a plurality of analog devices to send and / or receive analog data;
Connection unit selection means for selecting a connection unit for sending and / or receiving analog data from the plurality of connection units;
Signal receiving means for receiving a selection signal for selecting any one of the plurality of connecting portions from a digital device, and
The conversion device according to claim 1, wherein the connection unit selection unit selects a connection unit based on a selection signal received by the signal reception unit.

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