KR100200048B1 - System and method for automatically separating and processing mpeg-2 transmission stream and mpeg-1 system stream - Google Patents

Abstract

According to the present invention, when the MPEG-1 data and general data are provided to the user through a communication network, the data is transmitted through the same communication line using the MPEG-2 transport stream or the MPEG-1 system stream, and then the receiver receives the data. It is a system for automatic detection, classification and processing. Even though the MP-1 transport stream and MP-1 system stream are transmitted through the same communication channel, the receiver side depends on the data to be transmitted. Are automatically classified to detect the data, and the transmitted signal is 0, which is a synchronization word of the MPEG-2 transport stream and the MPEG-1 system stream, so that the data can be properly processed. 47 and 0 000001BA distinguishes between MPEG-2 and MPEG-1 using the periodicity of the sync word of the Amp-2 transport stream and overcomes the transmission error.

Description

MPEG-2 Transport Stream and MPEG-1 System Stream Automatic Classification / Processing System and Method

1 is a schematic diagram of the MPEG-2 transmission stream and MPEG-1 system stream of the present invention.

2 is a control block diagram of the MPEG-2 transport stream and MPEG-1 system stream automatic classification / processing system of the present invention.

3 shows zero of the present system. 47 State Diagram Diagram at Detection.

4 is an operational flowchart of the overall system of the present invention.

Figure 5 (a) is a flow diagram of automatic synchronization word classification of the main processing unit main routine of the present invention.

(b) is a data processing flowchart of the central processing unit main routine of the present invention.

* Explanation of symbols for main parts of the drawings

100: network portion 10: connector portion

20: network interface unit 30: serial / parallel conversion and latch unit

40: control unit 41: network interface control block

42: buffer control block 43: byte alignment block

44: MPEG-1 / MP-2 priority decision block 45-1: 0 47 Control Block

45-2: 0 000001BA detection unit control block 46: EMPAC-2 state machine block

47: 188 byte counter block 48: status register control block

49: connection logic control block 50: buffer

60: 0 47 Detector 70: 0 000001BA detector

80: status register part 200: main memory part

300: central processing unit 400: data processing unit

401: MPEG-1 data decoder 402: general data processor

500: connection logic section

According to the present invention, when the MPEG-1 data and general data are provided to the user through a communication network, the data is transmitted through the same communication line using the MPEG-2 transport stream or the MPEG-1 system stream, and then the receiving end is transmitted. It is about a system that automatically detects it, classifies it, and processes it.

The existing MPEG-1 is an audio / video data compression and interface technology suitable for systems with few errors. The application was not suitable for wireless communication systems. The audio / video data compression technology can design a system corresponding to an error occurrence by using the MPEG-2 transport stream when constructing a system having a high error probability while using an MPEG-1.

Therefore, all data can be processed using the communication line by sending data in the MPEG-2 transmission stream format to cope with a large error rate when transmitting using the communication line. This is to mix the stream with the MPEG-2 transport stream.

In other words, the current communication network integrates audio / video signals, communication and other information to the subscriber, and when providing a service to the subscriber using a telephone network (communication network), the general service does not require a communication concept. In the process of loading the data from the memory, the data is transmitted in the format of the MPEG-1 system stream, and the data requiring the communication concept transmits the data in the format of the MPEG-2 transport stream, even though it is transmitted through the same communication channel. Since the MPEG-1 system stream and the MPEG-2 transport stream can be automatically classified according to the data to be transmitted, appropriate processing for each data can be performed to detect the data. 0, the sync word of the transport stream 47 and 0 000001BA, and distinguishes each sync word by using the periodicity of the sync words of the MPEG-2 transport stream to distinguish and process the MPEG-2 and MPEG-1.

That is, MPEG-2 transmission including a connector unit, a control unit, a synchronization word detection unit, a status register unit, a connection logic unit, a main memory unit, a central processing unit, an MPEG-1 decoder unit, a general data processing unit, etc. By installing the stream and MPEG-1 system stream automatic classification / processing system, whether the MPEG-1 data and general data transmitted through the transmission path in the MPEG-2 transport stream and the MPEG-1 system stream format are the MPEG-2 transport stream. By distinguishing whether it is a system stream with a sync word, it distinguishes MP-2 and MP-1 and determines whether the synchronization data is detected correctly using the existence period of the synchronization data, thereby overcoming transmission error. In the -1 decoder unit, the general data is processed by the general data processor to provide a service.

Hereinafter, a configuration of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a network unit 100 is connected to a network such as a telephone line or a local area network to process transmission data and transmit data through a data line to a main memory unit and a central processing unit; A main memory unit 200 for accessing and storing a data format of 188 bytes inputted after the synchronization word at a high speed; A central processing unit (300) for interfacing with the network unit (100), the main memory unit (200), and the data processing unit (400) while adjusting the whole system; Comprising a data processing unit 400 for processing the data stored in the main memory unit 200 according to the characteristics of each data and the connection logic unit 500 for the interface between the network unit 100 and the central processing unit 300 The network unit 100 includes a connector unit 10 for performing an interface function with a signal transmitted through a transmission path; A network interface unit 20 for interfacing with a network such as a telephone line or a local area network; A serial / parallel conversion and latch unit (30) for converting the serial output of the network interface unit (20) in parallel and maintaining the input data at the output terminal until the next clock; A control unit 40 for controlling operations of the network interface unit 20, the buffer unit 50, the sync word detection unit 60, 70, the state register unit 80, and the connection logic unit 500; A buffer unit (50) for temporarily storing the output of the serial / parallel conversion and latch unit (30) and the output of the control unit (40) and transmitting the value to the sync word detection unit (60, 70); 0, which is a sync word of MPEG-2 transport stream, from the data of the buffer unit 50 0 to detect 47 47 detection unit 60; 0, which is a sync word of MPEG-1 system stream, from the data of the buffer unit 50 0 to detect 000001BA 000001BA detection unit 70; 0 above 47 detector 60 and 0 The 000001BA detection unit 70 comprises a status register unit 80 which stores which synchronization word is detected and indicates the overall state of the network interface unit 20. The data processing unit 400 includes the MPACK-1. An MPEG-1 decoder unit 401 for decoding audio / video data encoded in a format; A general data processing unit 402 is configured to process various general data other than data input to the MPEG-1 decoder unit 401, such as general information or graphic data of a bitmap.

In addition, as shown in FIG. 2, the controller 40 receives the transmission data from the network interface 20 and receives the signal of the MPEG-2 state machine block 46 to detect the synchronization detected by the state register control block 48. A network interface control block 41 for sending a signal to transmit a word; A buffer unit control block 42 which receives a signal every 188 bytes is counted and controls writing and reading of data to and from the buffer unit 50; The starting point is detected so that the serial data inputted continuously can be divided by 8 bits, and the data of the desired size can be detected in the buffer control block 42 and the MPEG-2 state machine block 46 from the starting point. A byte align block 43; An MPEG-1 / EMP-2 priority decision block 44 which controls to accept MPEG-2 synchronization words first; 0 47 The signal detected by the detector 60 is zero to the status register control block 48. 0 indicating 47 was detected 47 detection block control block 45-1; 0 The signal detected by the 000001BA detector 70 is zero to the status register control block 48. 0 indicating 000001BA was detected 000001BA detection unit control block 45-2; 0 An MPEG-2 state machine block 46 for checking whether the detection is a sync word or general data of the transport stream and adjusting the system in case of an error; 0 above 47 Detector block 45-1 and 0 A 188-byte counter block 47 for counting 188 bytes of one data format from the sync word when the 000001BA detector control block 45-2 detects the sync word; Network interface control block (41), 0 47 Detection block control block 45-1, 0 A state register control block 48 for receiving a signal from the 000001BA detector control block 45-2 and the MPEG-2 state machine block 46 to control a state register; Connection logic section control block 49 for controlling the interface between the central processing unit 300 and the network unit 100.

Referring to the MPEG-2 transport stream and the MPEG-1 system stream automatic classification / processing operation configured as described above are as follows.

First, the bitstream is input to the connector unit 10 in a format suitable for network characteristics, and the state of the signal input from the network interface unit 20 is checked, and pure data and this data are separated by separating data for network transmission and pure data. The control data indicating the existing period is sent to the serial / parallel conversion and latch unit 30, and the control unit 40 controls only the period in which the data exists or is inputted for the accuracy of data conversion. This is sent to the status register unit 80 is transmitted to the central processing unit 300 and the central processing unit 300 sends a signal to the control unit 40 for controlling the associated unit through the control unit 40, the network unit The 100 may be reset and enabled from the central processing unit 300, and the serial / parallel conversion and latch unit 30 composed of 32 bits may be 0. 47 and 0 Automatically detect 000001BA, and the converted data is shifted by 1 bit and 0 47 1 byte is 0 in detection unit 60 4 bytes are connected to 000001BA detection unit 70 and 0 to buffer unit 50. 47 or 0 When 000001BA is detected, it is written in byte units, which is adjusted by the byte alignment block 43 of the controller 40, and 0 When 47 is detected, the detected information is transmitted to the control unit 40, and the byte alignment block 43, the MPEG-2 state machine block 46, and the 188 byte counter block 47 are activated from this point in time. The register control block 48 is set to zero in the status register section 80. 47 is detected and the connection logic control block 49 accesses the connection logic 500 to 0. Recognize that 47 is detected, and if 0 When 000001BA is detected, this information is transmitted to the control unit 40. From this point of time, the byte alignment block 43 and the 188 byte counter block 47 are activated, and the state register control block 48 is connected to the state register unit ( 0 to 80) The connection logic unit control block 49 interrupts the central processing unit 300 through the connection logic unit 500 and sets the detection unit 000001BA, and the central processing unit 300 accesses the status register unit 80. 0 Recognizing that 000001BA has been detected, the internal MPEG-1 / MPAC-2 priority decision block 44 of the controller 40 is zero. 0 only when 000001BA is not detected The control unit 40 is controlled to accept 47 detection information.

When the sync word is detected and stored in the buffer unit 50 and stored in the buffer unit 50 and sent to the main memory unit 200 in units of 188 bytes, the buffer input / output is adjusted. 47 (0100 0111) may exist as general data, or it may be input as a different value due to a transmission error at the time when it should exist as a sync word.In order to operate the system normally and stably in case of such a case, From the time of detection of 0111 ', the state diagram as shown in FIG. 3 is activated. That is, when the state diagram detects '0100 0111' in hunt mode waiting for '0100 0111' to be detected, it goes to the win mode and counts 188 bytes of data and checks whether '0100 0111' is detected again. If it is in continuous mode and cannot be detected, it switches to sewing mode and waits for a signal that '0100 0111' is detected by counting 188 bytes in the sewing mode again. In the sewing mode, when '0100 0111' is detected due to a transmission error. In addition, as a mode for operating the system normally, the sewing mode may be set in several stages in consideration of the characteristics of the transmission path, and the win mode is the most normal mode when the sync word is detected and the sync word is normally detected every 188 bytes. The central processing unit 300 is notified of the point of time when the sync word is detected and the state of the bitstream by the point of change. To control the operation of the teeth 300, the control unit 40 sends a signal to the central processing unit 300 to send the data stored in the buffer unit 50 to the main memory unit 200, wherein the central processing unit 300 The controller 40 operates at a higher speed to transfer data, and the central processing unit 300 analyzes the transport stream when the data is inputted into the main memory 200 to analyze the MPEG-1 video / audio and general data. The MPEG-1 data is sent to the MPEG-1 decoder 401 and the general data is sent to the general data processor 402 at the appropriate time.

In addition, the AMP-2 state machine block (46) is 0 Check if 47 is the sync word of the transport stream or normal data and 0 Even if 47 is lost, the system is adjusted to operate normally. As shown in FIG. 0 on the assumption that 000001BA is not detected If the information that 47 is detected is inputted, the EMPAC-2 state machine block 46 enters the WIN mode, and then 0 again at the 188th byte. If the information that 47 is detected is entered, it is in win mode again, otherwise it is in missing mode. If the information that 47 has been detected is entered, it is in win mode again, otherwise it is in hunt mode. Interrupt to CPU 300 is zero From the time point 47 is detected, every 188 bytes high, the central processing unit 300 accesses the data in the status register unit 80 to determine the state of the data. In the win mode and the sewing mode, the central processing unit ( 300, the data is normal. In the hunt mode, an error message is transmitted to the CPU 300, and the 188-byte counter block 47 transmits 188-byte data from the buffer unit 50 to the main memory unit 200. In this case, the data transfer uses a high-speed data transfer method such as data memory access (DMA).

0 when data is stored in main memory 200 If 47 is detected, the central processing unit 300 analyzes the transport stream, converts the MPEG-1 data plane into the MPEG-1 system stream, stores it in the main memory unit 200 in a format specified by other general data, and then processes each of the processing units. 401, 402, where the MPEG-1 data is usually audio / video data, and the generic data refers to graphics and the like rather than MPEG-1 data.

The MPEG-1 dincoder 401 receives the MPEG-1 bitstream, decodes it, and outputs the MPEG-1 bitstream. The general data processor 402 processes and outputs the MPEG-1 bitstream.

0 If 000001BA is detected, the CPU 300 is stored in the main memory unit 200 as it is and then 0. After grasping the time when 000001BA is input, it is determined whether it is input. If not, the controller 40 resets and waits for detection of the next sync word.

The central processing unit 300 internally synchronizes word 0 when the input data is the system stream of MPEG-1. The authenticity of 000001BA is determined and the authenticity of the data is determined by accessing the data in the status register unit 80 in the case of the MPEG-2 transport stream.

Referring to the above operation in a flow chart as follows.

First of all, referring to the operation flowchart of the entire system, as illustrated in FIG. 4, a first step S1 of determining whether an MPEG-1 system stream is performed; A second step (S2) of enabling the byte align block (43), the 188 byte counter block (47), and the interrupt request and setting a status register in the case of the MPEG-1 system stream in the first step; A third step S3 of determining whether the MPEG-2 transport stream is not the MPEG-1 system stream in the first step; In the third step, in the case of the MPEG-2 transport stream, the byte alignment block 43, the 188byte counter block 47, the MPEG-2 state machine block 46, and the interrupt request are enabled, and the status register is set. A fourth step (S4) of jumping back to the first step if the MPEG-2 transport stream is not present; A fifth step S5 of jumping to an interrupt routine to read data of the status register unit 80 after the second and fourth steps; A sixth step S6 of determining whether the data read in the fifth step is an MPEG-1 system stream, an MPEG-2 transport stream, or an error; In the sixth step, in the case of the MPEG-2, jumping to the MPEG-2 routine to delay 188 bytes, enable the data memory access request, and transmit the transmitted data to the main memory 200, and analyze the MPEG-2 transport stream. A seventh step (S7) of converting the transport stream into a system stream; In the sixth step, in the case of the MPEG-1 system stream, jump to the MPEG-1 routine to delay 188 bytes, enable the data memory access request, transmit the transmission data to the main storage unit 200, and analyze the system stream header. An eighth step S8 to be performed; A ninth step S9 of determining whether a sync word of the header analyzed in the eighth step is correct; In case of an error in the sixth step and in the case of the synchronous word not matching in the ninth step, the controller 40 is reset, the data of the main memory unit 200 is cleared, and then the tenth step (S10) is jumped to the first step. Wow; After the conversion in the seventh step and when the sync word is correct in the ninth step, the operation is sequentially performed in the eleventh step S11 of transmitting data to each device, decoding, processing and outputting the data.

In addition, referring to the automatic word automatic classification operation of the main routine of the central processing unit, as shown in FIG. In case of an interrupt state in the first step, the data of the state register unit 80 is read to determine whether it is an MPEG-1 system stream, an MPEG-2 transport stream, or an error. Performing a second step T2 again; A third step (T3) of jumping to the MPEG-2 routine when the MPEG-2 transport stream is performed in the second stage; A fourth step (T4) of jumping to the MPEG-1 routine when the MPEG-1 system stream is the second stage; A fifth step (T5) of determining whether an error of the network interface unit 20 is an error in the second step; In the fifth step, if the error is not an error, jumps to the first step, if an error is reset, and then jumps to the first step again to the sixth step (T6) to execute the step again. The data processing operation of the main routine of the central processing unit may include a first step P1 of determining whether new data is present as shown in (b) of FIG. 5; A second step (P2) of clearing data of the main memory unit (200) and performing the first step again if it is not new data in the first step; If the data is new in the first step, the transport stream may be analyzed to store the data transmitted to the main memory 200, and then distributed to the MPEG-1 decoder 401 and the general data processor 402. Sequential operation

As described in detail above, the present invention encodes general data and MPEG-1 data transmitted without distinction through the same transmission path into MPEG-1 system stream and MPEG-2 transport stream formats, and then automatically classifies the data into each data. By decode and receive properly, the concept of communication concept Regardless of whether it is present, it is possible to transmit MPEG-1 data, which is audio / video data, to a user using a network currently available for general data.

Claims (8)

Using the same transmission path, the MP-1 system stream and the MPEG-2 transmission stream are mixed at the receiving end of the transmission path that transmits the MPEG-1 data and general data in the MPEG-1 system stream and the MPEG-2 transport stream format. EMPAK-1 and EMPAK-2 sync word automatic classification system, which transmits data, is connected to a network such as a telephone line or a local area network to process transmission data, and transmits the data to the main memory unit and the central processing unit via data lines. A network unit 100; A main memory unit 200 for accessing and storing the data format of 188 bytes inputted after the synchronization word at a high speed; The data stored in the central processing unit 300 and the main memory unit 200 to determine whether the transmitted data is an MPEG-1 system stream or an MPEG-2 transport stream and perform processing accordingly are determined according to the characteristics of each data. A data processor 400 for processing accordingly; And a connection logic unit (500) for interface between the network unit (100) and the central processing unit (300). The method of claim 1, wherein the network unit 100 includes a connector unit 10 for performing an interface function with a signal transmitted through a transmission path; A network interface unit 20 for interfacing with a network such as a telephone line or a local area network; A serial / parallel conversion and latch unit (30) which converts the serial output of the network interface unit (20) in parallel and keeps the input data at the output terminal until the next clock; A control unit 40 for controlling operations of the network interface unit 20, the buffer unit 50, the sync word detection unit 60, 70, the state register unit 80, and the connection logic unit 500; A buffer unit (50) for temporarily storing the output of the serial / parallel conversion and latch unit (30) and the output of the control unit (40) and transmitting the value to the sync word detection unit (60, 70); 0, which is a sync word of MPEG-2 transport stream, from the data of the buffer unit 50 0 to detect 47 47 detection unit 60; 0, which is a sync word of MPEG-1 system stream, from the data of the buffer unit 50 0 to detect 000001BA 000001BA detection unit 70; 0 above 47 detector 60 and 0 MPEG-2 transmission system and MPA, characterized in that it consists of a state register unit 80 for storing the synchronization word of the data detected from the 000001BA detection unit 70 and indicates the overall state for the network interface unit 20 -1 system stream automatic classification / processing system. The data processing unit of claim 1, further comprising: an MPEG-1 decoder unit 401 for decoding audio / video data encoded in MPEG-1 format; MPP, characterized in that it consists of a general data processing unit 402 for processing graphics data, such as various bit 뱁 other than the data input to the MPEG-1 decoder unit 401 and information data transmitted through the connection port when connected to the PC. -2 transmission system and MPEG-1 system stream automatic classification / processing system. The synchronization word of claim 2, wherein the control unit 40 receives the transmission data from the network interface unit 20, receives the clock signal of the MPEG-2 state machine block 46, and detects the synchronization word detected by the state register control block 48. A network interface control block 41 for sending a signal to transmit the signal; A buffer unit control block 42 which receives a signal every 188 bytes is counted and controls writing and reading of data to and from the buffer unit 50; The starting point is detected so that the serial data inputted continuously can be divided by 8 bits, and the data of the desired size can be detected in the buffer control block 42 and the MPEG-2 state machine block 46 from the starting point. A byte align block 43; An MPEG-1 / EMP-2 priority decision block 44 which controls to accept MPEG-2 synchronization words first; 0 47 The signal detected by the detector 60 is zero to the status register control block 48. 0 indicating 47 was detected 47 detection block control block 45-1; 0 The signal detected by the 000001BA detector 70 is zero to the status register control block 48. 0 indicating 000001BA was detected 000001BA hiding part control block 45-2; 0 An MPEG-2 state machine block 46 for checking whether the detection is a sync word or general data of the transport stream and adjusting the system in case of an error; 0 above 47 Detector block 45-1 and 0 A 188-byte counter block 47 for counting 188 bytes of one data format from the sync word when the 000001BA detection block control block 45-3 detects the sync word; Network interface control block (41), 0 47 Detection block control block 45-1, 0 A state register control block 48 for receiving a signal from the 000001BA detector control block 45-2 and the MPEG-2 state machine block 46 to control a state register; MPAC-2 transmission system and MPEG-1 system stream automatic classification / processing system, characterized in that consisting of a control logic block 49 for controlling the interface between the central processing unit 300 and the network unit 100. Using the same transmission path, the MP-1 system stream and the MPEG-2 transmission stream are mixed at the receiving end of the transmission path that transmits the MPEG-1 data and general data in the MPEG-1 system stream and the MPEG-2 transport stream format. An MPEG-1 and MPEG-2 sync word automatic classification method for transmitting may include a first step of determining whether an MPEG-1 system stream or an MPEG-2 transmission stream is present; A second step of enabling a byte alignment block, a 188 byte counter, and an interrupt request in the case of the MPEG-1 system stream in the first step, and setting a status register; A third step of enabling a byte alignment block, an MPEG-2 state machine block, a 188 byte counter block, and an interrupt request in the case of the MPEG-2 transport stream and setting a status register; A fourth step of performing a central processing unit main routine after the third step to store the MPEG-1 routine and the MPEG-2 routine according to the data of the status register; In the fourth step, when jumping to the MPEG-1 routine, a delay of 188 bytes is enabled, and then a data memory access request is enabled. Steps; When jumping to the MPEG-2 routine in the fourth step, delay the 188 bytes, enable the data memory access request, transmit data to the main memory, analyze the MPEG-2 transmission system, and convert the transport stream into a system stream. A sixth step; An MPEG-2 transmission system, characterized in that the sequential operation is performed in a seventh step of decoding, processing and outputting data in accordance with each data after the synchronization word of the fifth step and the conversion to the transport stream of the sixth step; MPEG-1 System Stream Automatic Classification / Processing Method. The method of claim 5, wherein the execution of the CPU processor's main routine in the fourth step automatically determines whether the synchronization word is an interrupt state. -2 a first step of determining whether a transport stream or an error has occurred; In the first step, if the MPEG-1 system stream jumps to the MPEG-1 routine, if the MPEG-2 transport stream jumps to the MPEG-2 routine, and if an error occurs, determining whether an error has occurred in the network interface unit. A second step; In the second step, if an error of the network interface jumps to the first step, and if it is not an error of the network interface, the controller sequentially resets the control unit to the third step of jumping to the first step. Transmission system and MPEG-1 system stream automatic classification / processing method. 6. The method of claim 5, further comprising: a first step of determining whether the performing of data processing in the central processing unit main routine of the fourth step is new data; A second step of clearing data of the main memory unit 200 and performing the first step again if it is not new data in the first step; If the data is new in the first step, the transport stream is sequentially analyzed, and the data stored in the main memory unit 200 are stored and distributed to the MPEG-1 decoder 401 and the general data processor 402. MPEG-2 transmission system and MPEG-1 system stream automatic classification / processing method characterized in that. As a method for distinguishing '0100 0111' as a transmission error and a sync word from '0100 0111' as general data, when '0100 0111' is detected, the state diagram is operated to operate in the hunt mode to detect '0100 0111'. A first step of waiting; A second step of determining whether '0100 0111' is detected by transiting to win mode and counting data when '0100 0111' is detected; In step 2, if '0100 011' is detected every 188 bytes, the win mode is maintained. If not, transition to the hunt mode waits for a signal indicating that a sync word has been detected from the sync detector. MPEG-2 transmission system and MPEG-1 system stream automatic classification / processing method characterized in that it operates in sequence.