JPH09284342A - Data converting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the load of another processor and also to execute the addition and the detection of copy management information by judging the kind of data at every transmission packet flowing in a realtime transmission path and converting a transmission format in accordance with it. SOLUTION: A data recording and reproducing device 2 as a data output device and a digital broadcasting receiver 3 add the header of a prescribed form in IEEE 1394 every packet and transmit it to a bus 1. A signal kind acquisition device 30 in a data converter 5 reads the transmission packet header of data in the bus, a controller 31 extracts an FMT bit string so as to judge a signal kind and a conversion processor 32 successively executes a conversion processing at the time of conversion processing possible. In the MPEG 2 transmission packet, copy management information described in an information table is extracted and copy management information by a sector unit is generated in accordance with the contents and added to a sector external part together with kind information which indicates the MPEG2 signal. On the contrary, copy management information of the sector external part is extracted and deleted in accordance with the operation so that copy management information is rewritten.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data conversion device for converting transmission formats of video, audio and computer data.

[0002]

2. Description of the Related Art In recent years, the standardization of data buses for transmitting digital signals has advanced, and particularly the recently standardized IEEE.
The bus called E1394 is expected to be put into practical use as it can send various kinds of data such as digital video signals and computer data on the same bus. This bus has a mode called isochronous transmission, and there is no data loss in the transmission of digital video signals and the like, and the required strictness of the transmission timing can be satisfied.

The structure and operation of the currently considered digital data bus will be described with reference to FIG. IEEE1
Various data processing devices are connected to the 394 bus 1.
In this example, 2C is a data recording / reproducing apparatus, 50 is a data converter, 11 is a recording / reproducing unit, 12C is a controller, and 13C is an interface circuit. 3 shows a digital broadcast receiver as a data output device,
Reference numeral 15 is a receiving unit, 16 is a decoding / reproducing unit, and 14 is an interface circuit.

Reference numeral 4C indicates a data processor (PC), 51 is a data converter, 17C is an interface circuit, 18 is a HDD, 19 is a memory, 20 is a CPU, 21.
Indicates an internal bus. Hereafter, items with the same number have the same configuration and function.

Regarding the digital data bus to which the data processing device and the like configured as described above are connected,
The operation will be described. The data flow here is isoch
It is assumed that the transmission is based on the Ronus transmission.

In the digital broadcast receiver 3, the receiving section 15 receives and demodulates the broadcast signal, and the MPEG2 transmission packet format is sent to the interface circuit 14 and the decoding / reproducing section 16. The decoding / reproducing unit 16 separates and decodes the input data and outputs it to a display or the like. The interface circuit 14 adds a header of a prescribed format of IEEE 1394 for each packet and sends it out on the bus.

In the data recording / reproducing apparatus 2C, when the input data is the data from the digital broadcast receiver 3, the data converter 50 first converts the input data into a recordable format. Specifically, 188Byt
A plurality of MPEG2 transmission packets having a size of e are collected to generate a recording sector 2048 Byte. One M
Dummy data is inserted as necessary so that the PEG2 transmission packet does not extend over two recording sectors.

When the data is sent from the data processing device 4C in 2048-byte sector unit, the 2048-byte sector is recorded as it is.
2048B by the interface circuit 53 during playback
A predetermined header of IEEE 1394 is added to the sector of yte and output.

In the data processor 4C, when the input data is the data from the digital broadcast receiver, the data converter 51 first converts the input data into a processable format. Specifically, for example, when recording on the HDD 58, an MPE having a size of 188 bytes is used.
Recording sector 2048 by collecting a plurality of G2 transmission packets
Generate Byte. Dummy data is inserted as necessary so that one MPEG2 transmission packet does not extend over two recording sectors.

If the data is from the data recording / reproducing apparatus 2C and is sent in 2048-byte sector units, 2048-byte sectors are recorded as they are. IEEE1 in the 2048-byte sector during playback
A predetermined header of 394 is added and output.

In addition, for example, in the case of software processing by a video board or CPU, data is sent in a predetermined format on the internal bus.

[0012]

In this data bus and data converter, data of various data formats such as video / audio data and computer data flows, and is reproduced and converted. Therefore, the reproduction and conversion can be performed without any difference between the data that the copyright permits and the data that the copyright does not permit.

Further, a data conversion device is required for each of the data recording device and the data processing device, and a new data conversion format is required every time a device of a new format is connected, which in the worst case is extremely redundant and costly. There is a possibility that it will become a high system.

It is an object of the present invention to provide a data conversion device that changes conversion for each data type of data to be reproduced, and a data conversion device that changes conversion for each data type of received data.

[0015]

In order to solve this problem, the first aspect of the present invention is to connect a data packet of packet format to a real-time transmission line for transmitting with a fixed delay time, and to transmit a data packet flowing on the real-time transmission line. The transmission format of the, the result of the examination, if the transmission format is a predetermined first format, the transmission format of the data packet is converted into a predetermined second format to generate a second data packet, The data conversion device is characterized by outputting the second data packet on the real-time transmission track.

A second aspect of the present invention is intended to connect at least a data packet among the processing devices connected to the real-time transmission line by connecting the packet-type data to the real-time transmission line for transmitting the data with a constant delay time. An output device that is a processing device or a processing device that is outputting,
The type of each of the input device which is the processing device which is about to input the data packet or the input device which is being input is checked, and the output transmission type which is the transmission type of the data packet output from the output device according to the type checked Knowing the input transmission format which is the transmission format of the data packet to be input to the input device, and when the input transmission format and the output transmission format are respectively predetermined formats, first data output from the output apparatus The data conversion device is characterized in that a transmission format of a packet is converted into the input transmission format to generate a second data packet, and the second data packet is output to the input device.

According to a third aspect of the present invention, as a format of the second data packet, for each sector having a predetermined length, data type information indicating the type of data arranged in the data area in the sector and a copy relating to the data. If there is an attached information area for arranging management information and there is no attached information area for arranging the first data packet the data type information and the copy management information, the data in the first data packet The data conversion device is characterized in that the data type information and the copy management information are generated from, and are added to the first data packet and output as a second data packet format.

In a fourth aspect of the present invention, as a first data packet format, for each sector having a predetermined length, data type information indicating the type of data arranged in a data area in the sector and a copy relating to the data. If there is an attached information area for arranging management information, and the second data packet does not have the attached information area for arranging the data type information and the copy management information, the data in the second data packet A portion in which information corresponding to the data type information and the copy management information is written is rewritten corresponding to the current data type information and the copy management information, and the data type information and A data conversion device, characterized in that the copy management information is removed and output as a second data packet format.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram of a first embodiment of the present invention. Various data processing devices are connected to the IEEE 1394 bus 1. In this embodiment, 2 is a data recording / reproducing device, 11 is a recording / reproducing unit,
Reference numeral 12 is a controller, and 13 is an interface circuit. Reference numeral 3 denotes a digital broadcast receiver as a data output device, 15 is a receiving unit, 16 is a decoding / reproducing unit, and 14
Is an interface circuit.

Reference numeral 4 denotes a data processor (PC), 5 a data converter, 17 an interface circuit,
18 is a HDD, 19 is a memory, 20 is a CPU, and 21 is an internal bus. In the data converter 5, 30 is a signal type acquisition device, 31 is a controller, 32 is a conversion processing device,
33 is a memory.

Regarding the digital data bus to which the data processing device and the like configured as above are connected,
The operation will be described. The data flow here is isoch
It is assumed that the transmission is based on the Ronus transmission.

In the digital broadcast receiver 3, the receiving section 15 receives and demodulates the broadcast signal and sends it to the interface circuit 13 and the decoding / reproducing section 16 in the MPEG2 transmission packet format. The decoding / reproducing unit 16 separates and decodes the input data and outputs it to a display or the like. The interface circuit 13 adds a header of a prescribed format of IEEE 1394 for each packet and sends it out on the bus.

Signal type acquisition unit 30 in data converter 5
Monitors the data flowing on the digital bus for each transmission packet. Specifically, the transmission packet header of each real-time transmission packet is read, and a bit string called FMT that indicates the type of signal at a predetermined position in the packet is extracted and compared by the controller 31. When this value can be converted by the data converter 5, the conversion processing device 32 sequentially performs conversion processing.

First, FIG. 2 shows a conversion method when the data is an MPEG2 transmission packet. Digital broadcast receiver 2
In the MPEG2 transmission packet output from, for example, a transmission packet 188 Byte (or an integral fraction thereof, an integral multiple thereof) is used as a transmission unit, and a predetermined 1394 transmission packet header is added and transmitted.

In this case, the copy management information is MPEG2.
Although it is present in the signal, it is not added to the sector unit used for recording / reproducing processing. For this reason, the MPEG2 signal is divided into predetermined sector sizes of 2048 Bytes, and in the MPEG2 signal, specifically, the header of the transmission packet and the PES packet which is the lower layer thereof, and the copy management information described in the information table. And copy management information for each sector is generated according to the contents of the M
It is added to the outside of the sector together with the data type information indicating that it is a PEG signal. Dummy data is inserted as necessary so that one MPEG2 transmission packet does not extend over two recording sectors.

On the contrary, when an MPEG2 transmission packet to which copy management information is added for each sector is transmitted, the copy management information outside the sector is extracted and deleted to disassemble the sector structure, and the transmission packet and The header of the PES packet and the copy management information described in the information table are rewritten as necessary.

Next, FIG. 2 shows a case where the data is a transmission packet of a digital VCR. The data from the digital VCR is transmitted by adding a predetermined 1394 transmission packet header with the recording packet 80 Byte (an integral multiple thereof) as a transmission unit.

In this case, the copy management information is present in the digital VCR, but is not added to the sector unit used in the recording / reproducing process or the like. Therefore, the digital V
3 for each recording packet that is redundant in CR signal transmission
While removing the fixed header of Bytes and the like, the data is divided into predetermined sector sizes of 2048 Bytes, and the copy management information described in the digital VCR signal, specifically, the video information recording packet is extracted, and the contents are extracted. Correspondingly, the copy management information for each sector is generated and added to the outside of the sector together with the data type information indicating the digital VCR data. One digital VCR
Dummy data is inserted as necessary so that the recording packet does not extend over two recording sectors.

On the contrary, when the digital VCR signal to which the copy management information is added for each sector is transmitted, the copy management information outside the sector is extracted and deleted, and the reduced fixed header or the like is restored to restore the sector. The structure is dismantled, and the copy management information described in the video information recording packet is rewritten as necessary.

The data converted as described above is output separately after securing a transmission band separately from the input data. The timing of transmitting the data on the bus is the timing of the data before conversion plus a certain delay corresponding to the attached information. On the bus, types of packets corresponding to copy management information and those of other types flow almost simultaneously. Each processing device fetches the corresponding packet according to an instruction given to each device and performs processing.

In the data recording / reproducing apparatus 2, only the input data having the format of the recording sector 2048 Byte + copy management information is selected, and the interface circuit 13 records the data with the predetermined header of IEEE 1394 removed. Controller 1 as needed when recording
2, the number of copies of the copy management information is changed.
2048B by interface circuit 13 during playback
A predetermined header of IEEE 1394 is added to the sector of yte and output.

Similarly, the data processing device 3 selects only the input data having the format of the recording sector 2048 Byte + copy management information, and records it in the interface circuit 17 with the predetermined header of IEEE 1394 removed. . Data that does not have copy management information is prevented from flowing directly to the internal bus in the PC.
As described above, by providing the data converter 5 separately, each processing device does not need to have a conversion function,
All you have to do is judge whether or not the data that you can handle is flowing.

FIG. 4 shows a block diagram of the second embodiment of the present invention. Various data processing devices are connected to the IEEE 1394 bus 1. In this embodiment, 2 is a data recording / reproducing apparatus, 11 is a recording / reproducing unit, 12 is a controller, and 13 is an interface circuit. Reference numeral 3 denotes a digital broadcast receiver as a data output device, and 1
Reference numeral 5 is a receiving unit, 16 is a decoding / reproducing unit, and 14 is an interface circuit.

Reference numeral 4B represents a data processor (PC), 6 is a data converter, 17 is an interface circuit,
18 is a HDD, 19 is a memory, 20 is a CPU, and 21 is an internal bus. In the data converter 6, 34 is a device type acquisition device, 31 is a controller, 32 is a conversion processing device,
33 is a memory.

Regarding the digital data bus to which the data processing device and the like configured as described above are connected,
The operation will be described. The device type acquisition unit 34 in the data converter 6 stores the inquiry result about the type of the processing device connected on the bus when it is connected to the digital bus and immediately after the bus reset occurs. In particular,
Each interface circuit has its own processing device type as an IEEE 1394 device name and sub device name, and the type can be inquired by a command.

When a request for transmission from one processing device to another processing device is issued, the controller determines whether the data needs to be converted or the corresponding conversion depending on the type of the device. Judge by 35. If the result of the determination is that the data can be converted, the data converter 6 once obtains the data, and after the data is converted, the data flow is made so that the processing unit on the input side receives the output from the data converter 6. To control. The specific data conversion method of the conversion processing device 32 is the same as that described in the first embodiment.

Although the IEEE 1394 bus is used as the digital data bus in each of the above embodiments, other buses may be used as long as they meet the timing accuracy required for digital image data transmission and the like. . The data conversion method shown in FIGS. 2 and 3 is an example, and similar processing can be performed in the case of other digital image signals such as JPEG data.

[0039]

As described above, according to the present invention, when data is transferred through the digital data bus, in the first invention, the data converter determines the type of data for each flowing transmission packet, and By applying the conversion accordingly,
The load on other processing devices can be reduced.

In the second aspect of the present invention, the data converter determines the data type for each flowing transmission packet and performs conversion according to the data type, thereby reducing the load on other processing devices.

In the third and fourth aspects of the present invention, the data type information and the copy management information are generated and added to the data to be reproduced for each sector having a predetermined length, and conversely the added data type information and Copyright management can be performed by rewriting the internal data from the copy management information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a data conversion device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the operation of the data converter in the data converter of the first embodiment of the present invention.

FIG. 3 is a diagram showing the operation of the data converter in the data converter of the first embodiment of the present invention.

FIG. 4 is a block diagram showing a data conversion device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional data converter.

[Explanation of symbols]

 1 IEEE 1394 Digital Bus 2, 2C Digital Recording / Reproducing Device 3 Digital Broadcast Receiver 4 Data Processing Device (PC) 5, 6 Data Converter 10 Data Type Information Extractor 11 Recording / Reproducing Unit 12 Controller 13, 13C, 14, 17, 17C D-IF 15 receiver 16 decoding / reproducing unit 18 HDD 19 memory 20 CPU 21 internal bus 30 signal type acquirer 31, 35 controller 34 device type acquirer 32 conversion processor 33 memory 50, 51 data converter

Claims (5)

[Claims] 1. A transmission format of a data packet flowing on the real-time transmission path is checked by connecting to a real-time transmission path for transmitting packet format data with a constant delay time.
As a result of the examination, when the transmission format is the predetermined first format, the transmission format of the data packet is converted into the predetermined second format to generate the second data packet, and the second data packet is generated. Is output on the real-time transmission track. 2. A processing device which is connected to a real-time transmission line for transmitting packet format data with a fixed delay time and which is at least outputting a data packet among the processing devices connected to the real-time transmission line or during output. Of each of the output device which is the processing device and the input device which is the processing device which is trying to input the data packet or the input device which is being input, and the data packet which is output from the output device according to the checked type The output transmission format which is the transmission format of and the input transmission format which is the transmission format of the data packet input to the input device, and when the input transmission format and the output transmission format are respectively predetermined formats, the output The transmission format of the first data packet output from the device is converted into the input transmission format, and the second It generates a data packet, the data conversion device and outputs the second data packet to the input device. 3. As a second data packet format, for each sector having a predetermined length, data type information indicating the type of data placed in a data area in the sector and copy management information relating to the data are placed. In the case of having an attached information area and not having the attached information area for arranging the first data packet the data type information and the copy management information, the data type information from the data in the first data packet And a data conversion device that generates the copy management information, adds the copy management information to the first data packet, and outputs the second data packet format. 4. As a first data packet format, for each sector having a predetermined length, data type information indicating the type of data placed in a data area in the sector and copy management information about the data are placed. When the second data packet has an attached information area and does not have the attached information area for arranging the data type information and the copy management information, the data type in the data in the second data packet. The portion in which the information and the information corresponding to the copy management information are written is rewritten corresponding to the current data type information and the copy management information, and the data type information and the copy management information are written from the first data packet. A data conversion device, characterized in that the data is removed and output as a second data packet format. 5. When the first data packet is divided into sectors of a predetermined length in the second data packet, data at a predetermined position in the predetermined first data packet is increased or decreased. The data conversion device according to claim 3 or 4.