JP4045907B2 - Data conversion system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data conversion system and a conversion apparatus for connecting an analog device and a digital device and converting the data into a form in which data can be used between the devices, and more specifically, a plurality of analog devices can be connected to improve the usability of the system. It is intended to improve.
[0002]
[Prior art]
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.
[0003]
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.
[0004]
In addition, the media conversion device 2 has specifications related to digital data based on IEEE 1394, and the digital camera 2 and a portable personal computer are connected to the digital port 2a. 5 Are connected by communication cables 3a and 3b by a daisy chain method to form a communication bus 3.
[0005]
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.
[0006]
[Patent Document 1]
JP 2002-152244 A
[0007]
[Problems to be solved by the invention]
In recent years, in addition to external digital devices brought into the vehicle, the number of digital devices mounted on the vehicle from the beginning as an in-vehicle device 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 transmit and receive data between the required devices.
[0008]
However, as described above, the conventional media conversion device 2 is not suitable for connecting a plurality of digital devices. Correspondingly However, since only one analog device can be connected, there is a problem that a plurality of digital devices and a plurality of analog devices cannot be connected. 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.
[0009]
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.
[0010]
The present invention has been made in view of such circumstances, and by converting a plurality of digital devices and a plurality of analog devices by a media conversion device, data conversion with improved usability of data possessed by each device is achieved. System The The purpose is to provide.
The present invention also provides a data conversion system capable of reliably transmitting data between specific devices even when a plurality of analog devices are connected. The The purpose is to provide.
[0011]
[Means for Solving the Problems]
A data conversion system according to a first invention is an in-vehicle data conversion system in which a digital device and an analog device are connected by a conversion device that performs A / D conversion and / or D / A conversion of data. And the conversion device connects the plurality of analog devices to send and / or receive analog data. Each was assigned a unique number Multiple connections And a number adding means for adding the unique number of the connection unit that received the analog data from which the data was converted to the digital data that has undergone A / D conversion, and a digital that has the unique number added by the number adding means Sending means for sending the data to the digital device; With The digital device includes a number setting means for setting a unique number, a number detecting means for detecting a unique number added to digital data sent by the sending means, a unique number detected by the number detecting means, and the A data acquisition means for acquiring digital data to which the unique number is added when the unique numbers set by the number setting means are the same; It is characterized by.
[0012]
The data conversion system according to the second invention is: In an in-vehicle data conversion system in which a digital device and an analog device are connected by a conversion device that performs A / D conversion and / or D / A conversion of data, the analog device has a plurality, and the digital device has a communication cable. The converter is connected to the converter, and the converter connects the plurality of analog devices to send and / or receive analog data, and the bandwidth of the communication cable. Detection means for detecting, and connection section blocking means for blocking any of the plurality of connection sections when there is no available bandwidth detected by the detection means It is characterized by providing.
[0013]
A data conversion system according to the third invention is In the data conversion system of the first or second invention, the conversion device further includes a connection selection unit that selects a connection unit that sends and / or receives analog data from the plurality of connection units. It is characterized by providing.
[0014]
A data conversion system according to a fourth invention is: In an in-vehicle data conversion system in which a digital device and an analog device are connected by a conversion device that performs A / D conversion and / or D / A conversion of data, the analog device is plural, and the conversion device is the plural A plurality of connection units that connect analog devices to each other and send and / or receive analog data, and a connection that selects a connection unit that sends and / or receives analog data from the plurality of connection units Part selection means, and the digital device further comprises signal sending means for sending a selection signal for selecting any one of the plurality of connection parts, and the conversion device further includes the signal sending means. Signal receiving means for receiving the transmitted selection signal is provided, and the connection portion selecting means selects the connection portion based on the selection signal received by the signal receiving means. It is characterized by that.
[0018]
In the data conversion system according to the first aspect of the present invention, as a media conversion device capable of connecting a plurality of digital devices. Strange A plurality of analog devices are provided by providing a connection unit for a plurality of analog devices in the conversion device. Change It becomes possible to connect to a conversion device, and a plurality of digital devices and a plurality of analog devices can be connected. As a result, the data held by each device can be used effectively between the devices.
[0019]
Further, in the data conversion system according to the first invention, digital data to which a unique number assigned to each connection portion is added. Change The digital device selects the digital data received according to the set unique number and sends it from the conversion device. Therefore, even if multiple analog devices are connected to the conversion device, Data can be reliably transmitted to the device. Note that such a unique number corresponds to, for example, a channel number for isochronous transfer (synchronous transfer) in IEEE1394. , Strange The conversion device adds a channel number to a packet for transmitting data, so that the digital device can acquire desired data from a plurality of data flowing through the communication bus based on the channel number added to the packet.
[0020]
In the data conversion system according to the second invention, a digital device Change Bandwidth of the communication cable connected to the conversion device Change If the conversion device detects that there is no available bandwidth, it cuts off one of the connections, so even if a large amount of data is sent from multiple analog devices, the data will overflow from the communication bus on the digital device side. Can prevent the situation. 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.
[0021]
Data conversion system according to the third invention In this case, since the connection unit to be used is selected from the plurality of connection units by the connection unit selection means, data is transmitted from the digital device to the analog device, and data is transmitted from the analog device to the digital device. In some cases, reliable data transmission can be realized by defining a data transmission path.
[0022]
Note that such a connection portion selection means corresponds to a CPU that performs control in the conversion device, and the CPU appropriately switches the connection portion to be used, for example, in accordance with the switch position of a changeover switch provided in the conversion device. To. As a result, only analog devices connected to the connection unit selected in this way can transmit and receive data, and devices that perform data transmission can be restricted. When data transmission is performed based on the above-described unique number, a plurality of connection units may be selected by the connection unit selection unit.
[0023]
The data conversion system according to the fourth invention is a case where the connecting portion selecting means selects the connecting portion by a signal such as a command for selecting the connecting portion instead of the switch position of the changeover switch described above, and is transmitted from the digital device. Based on the connection selection signal , Strange 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 uses a single selection signal. Strange The selection signal may be transmitted together with the data to be transmitted.
[0024]
Further, when a communication bus including a digital device is formed based on IEEE 1394, a selection signal is transmitted in a packet. In IEEE 1394, the packet is destination Is sent to all digital devices included in the communication bus, and each digital device accepts the packet once and then based on the added destination. Accepted Determine whether the packet is addressed to itself. 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.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
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 converter 11, a back camera 12, a left camera 13, an analog monitor 14, and an analog video device 15. Etc. A plurality of in-vehicle analog devices, a DVD device 16, a digital monitor 17, a DV camera 18, and a portable personal computer 19 Etc. A plurality of digital devices compatible with IEEE1394 are connected. Each digital device is connected with communication cables 25a to 25d. Daisy chain As a whole, an IEEE1394 communication bus 25 is formed.
[0026]
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”.
[0027]
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. Each terminal 21a of each analog port 21 to 24 24d An analog cable from the analog device is connected to any or all of these according to the function of the analog device itself.
[0028]
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.
[0029]
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 22 a 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.
[0030]
As shown in FIG. 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.
[0031]
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. In addition, when A / D conversion is performed, the A / D / D / A conversion LSI 30 functions as a number adding unit, and the A / D converted digital data is converted into the digital data. conversion The channel number of the analog port that received the original analog data is added.
[0032]
For example, “1” that is the channel number of the first analog port 21 is added to the digital data that is 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.
[0033]
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.
[0034]
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 performs format conversion 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 received by the phi LSI 33 is A / D. Transmit in parallel to the D / A conversion LSI 30.
[0035]
The link control LSI 31 of this 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.
[0036]
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.
[0037]
Further, the phi LSI 33 transmits data serially over the IEEE 1394 communication bus 25. From the fact The serial data received by each digital port 11a, 11b is converted into a parallel state, and the parallel data received from the link control LSI 31 is also converted into a serial state.
[0038]
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.
[0039]
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.
[0040]
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.
[0041]
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.
[0042]
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 IEEE 1394, one of the digital devices from the DVD device 16 to the personal computer 19 is connected to the IRM (IEEE 1394). Isochronous It functions as a Resource Manager.
[0043]
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.
[0044]
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.
[0045]
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 the 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.
[0046]
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.
[0047]
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.
[0048]
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.
[0049]
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.
[0050]
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.
[0051]
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.
[0052]
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.
[0053]
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).
[0054]
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).
[0055]
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 conversion device 11 selects the third analog port 23 based on the selection signal (S6), and converts the received packet digital data into a general format. In After conversion, 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).
[0056]
As described above, the data conversion system 10 according to the present invention enables a plurality of analog devices to be connected to the media conversion device 11 and reliably transfers data of a certain digital device from a plurality of analog devices to a specific analog device. Can be transmitted.
[0057]
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.
[0058]
First, before transmitting data, in the media converter 11, only the third switch part 37c of the changeover switch 37 is turned on, and the other switch parts 37a, 37b, and 37d are turned off, and the third analog port is set. 23 Only with data Pass through Put it in a state. 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 Only data passing It is transmitted to the analog monitor 14 via a possible third analog port 23.
[0059]
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.
[0060]
on the other hand, When performing data transmission from an analog device to a digital device, the data conversion system 10 uses a method based on a channel number, a method based on a selection signal, and a changeover switch 37. Way of Three types of processing methods can be used. First of all, the back camera 12 shown in FIG. But A case where captured image data is transmitted to the digital monitor 17 and displayed will be described with reference to the second flowchart of FIG.
[0061]
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).
[0062]
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).
[0063]
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.
[0064]
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.
[0065]
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.
[0066]
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).
[0067]
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.
[0068]
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.
[0069]
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.
[0070]
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).
[0071]
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.
[0072]
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.
[0073]
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.
[0074]
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.
[0075]
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.
[0076]
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, a part related to transmission, reception, and determination of a selection signal may be omitted from each digital device and the media conversion device 11.
[0077]
【The invention's effect】
As detailed above, in the data conversion system according to the first invention, , Strange By providing connection units for a plurality of analog devices in the exchange device, it is possible to realize a connection between a plurality of digital and analog devices and to improve data usability.
More , Strange Since the conversion device adds the unique number of each connection part and sends the digital data, the digital device can select the digital data based on the added unique number, and even if many devices are connected, Can transmit data.
[0078]
In the data conversion system according to the second invention , Strange Since the conversion device detects the bandwidth of the communication cable that connects the digital equipment, if the data overflows due to a large amount of data transmission, the required connection is cut off. Strange The amount of analog data received by the conversion device is limited, and a good data transmission state can be maintained.
[0079]
In the data conversion system according to the third aspect of the invention, since the connection unit to be used is selected from the plurality of connection units, both data transmission from the digital device to the analog device and data transmission from the analog device to the digital device are performed. In this case, the data transmission path can be reliably controlled by restricting the data transmission path.
In the data conversion system according to the fourth invention, based on the selection signal transmitted by the digital device , Strange Since the conversion device selects the connection unit, the connection unit to be used can be selected from the digital device, and the convenience of the system can be improved for data transmission in the phase direction of the digital device and the analog device.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a data conversion system according to an embodiment of the present invention.
FIG. 2 is an internal configuration diagram of the media conversion device.
FIG. 3 is a schematic diagram of a changeover switch.
FIG. 4 is a schematic configuration diagram of a DV camera.
FIG. 5 is a first flowchart showing processing when data is transmitted from a digital device to an analog device.
FIG. 6 is a second flowchart showing processing when data is transmitted from an analog device to a digital device based on a channel number.
FIG. 7 is a third flowchart showing processing when data is transmitted from an analog device to a digital device based on a selection signal.
FIG. 8 is an overall configuration diagram of a conventional data conversion system.
[Explanation 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 selector switch
S vehicle

Claims (4)

In an in-vehicle data conversion system in which a digital device and an analog device are connected by a conversion device that performs A / D conversion and / or D / A conversion of data,
The analog device is plural,
The conversion device connects a plurality of analog devices to send and / or receive analog data, and a plurality of connection units assigned with a unique number, and digital data subjected to A / D conversion Number adding means for adding the unique number of the connection unit that has received the analog data from which the data is converted, and sending means for sending digital data to which the number adding means has added the unique number to the digital device With
The digital device includes a number setting means for setting a unique number, a number detecting means for detecting a unique number added to digital data sent by the sending means, a unique number detected by the number detecting means and the number A data conversion system comprising: a data acquisition unit configured to acquire digital data to which the unique number is added when the unique number set by the setting unit is the same. In an in-vehicle data conversion system in which a digital device and an analog device are connected by a conversion device that performs A / D conversion and / or D / A conversion of data,
The analog device is plural,
The digital device is connected to the converter via a communication cable;
The conversion device includes a plurality of connection units that connect the plurality of analog devices to transmit and / or receive analog data, a detection unit that detects a bandwidth of the communication cable, and a detection unit that detects the bandwidth. A data conversion system comprising: a connection section blocking means for blocking any of the plurality of connection sections when there is no available bandwidth.   3. The data conversion system according to claim 1, wherein the conversion device further includes a connection unit selection unit that selects a connection unit that transmits and / or receives analog data from the plurality of connection units. In an in-vehicle data conversion system in which a digital device and an analog device are connected by a conversion device that performs A / D conversion and / or D / A conversion of data,
The analog device is plural,
The conversion device connects the plurality of analog devices to send and / or accept analog data, and sends and / or accepts analog data from the plurality of connections. A connection portion selecting means for selecting a connection portion to be performed,
The digital device includes signal transmission means for transmitting a selection signal for selecting any one of the plurality of connection units.
The conversion device further includes a signal receiving means for receiving the selection signal sent by the signal sending means,
The data conversion system, 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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