KR20020073034A - A apparatus for transmitting and receiving transport stream - Google Patents

Abstract

PURPOSE: A device for receiving and transmitting transmission streams is provided to effectively receive or transmit transmission streams regardless of the equipment in the ATSC(Advanced Television System Committee) or DVB(digital Video Broadcasting-terrestrial) standards by using a common input/output terminal, and reduce the space for a rear panel of the equipment. CONSTITUTION: A device for receiving and transmitting transmission streams includes a first storing unit(30) for storing modulated transmission streams of different broadcasting standards, a signal processing unit(31) for serial-processing valid data among the transmission streams stored in the first storing unit in the synchronous or asynchronous manner according to the broadcasting standards to output to the outside, and parallel-processing valid data among the transmission streams input from the outside in the synchronous or asynchronous manner according to the transmission standards, a second storing unit(34) for storing the asynchronous transmission streams parallel-processed by the signal processing unit, and a selecting unit(35) for selecting the synchronous transmission streams parallel-processed in the signal processing unit or the asynchronous transmission streams parallel-processed and stored in the second storing unit.

Description

A apparatus for transmitting and receiving transport stream

The present invention relates to a digital broadcasting apparatus, and more particularly, to an apparatus for efficiently transmitting and receiving a transport stream by sharing a broadcast standard used for SMPTE310 and DVB-ASI.

A standard for transmitting serial or synchronous asynchronous transmission streams between broadcasting equipment related to digital television broadcasting.The ATSC (Advanced Television System Committee) region uses the SMPTE310 (Society of Motion Picture and TelevisionEngineers 310) method and DVB (Digital). The Video Broadcasting-terrestrial region prefers Digital Video Broadcasting-terrestrial Asynchronous Serial Interface (DVB-ASI). Most broadcasting equipment is equipped with SMPTE310 board and DVB-ASI board separately to transmit and receive different broadcasting standards according to the region.

1 is a block diagram showing a configuration of a conventional SMPTE310 transport stream transmission and reception apparatus, 8VSB (Vestigial SideBand) decoder 10, FIFO (Fifst In First Out) 11, SMPTE310 block 12, LPF (Low Pass) Filter (13), Voltage Controlled Oscillator (VCO), among which SMPTE310 block 12 is P / S (Parallel to Serial) converter 12-1, Bi-phase coding unit 12 -2), a bipolar phase decoding unit 12-3, a serial to parallel (S / P) conversion unit 12-4, and a phase locked loop control unit 12-5.

Referring to the operation of the apparatus shown in FIG. 1, the 8VSB decoder 10 demodulates the On-Air 8VSB modulated signal and the final output outputs 8 bit parallel data of 2.69 MHz. The FIFO 11 is a memory serving as a buffer. The output of the 8VSB decoder 10 outputs an 188-byte Valid transport stream, a 20-byte Invalid stream, and an Invalid transport stream in the 313th field segment section. The FIFO 11 serves as a buffer for transmitting only 188 bytes of data components of the output of the 8VSB decoder 10 to the SMPTE310 block 12. The P / S converter 12-1 converts 8-bit parallel data output from the FIFO 11 into serial data. The bipolar phase coding unit 12-2 bipolar phase codes the serial data output from the P / S converter 12-1 to output final SMPTE310 data. The bipolar phase decoding unit 12-3 decodes bipolar phase coded serial SMPTE310 data input from the outside. The S / P converter 12-4 converts the decoded serial data output from the positive voltage decoder 12-3 into parallel data. Since the SMPTE310 standard is a serial transmission standard of a synchronous transport stream, it must be synchronized with a channel modulator. The PLL control unit 12-5 controls all blocks for synchronizing with the 8VSB decoder 10. The LPF 13 is a filter for changing the phase shift of the PLL control unit 12-5, which is output as a pulse width modulation (PWM) waveform, to a DC component. The transmission rate of 8VSB data is 19.392 Mbps, and a 38.785 MHz clock is required for the SMPTE310 block 12 to operate smoothly. VCO 14 generates a clock to smoothly operate SMPTE310 block 12.

Figure 2 is a block diagram showing the configuration of a conventional DVB-ASI transport stream transmission and reception apparatus, COFDM / QPSK / QAM (Coded Orthogonal Frequency Division Multiplexing / Quadrature Phase-Shift Keying / Quadrature Amplitude Modulation) decoder 20, input FIFO 21, a DVB-ASI block 22, a 27 MHz OSC (Oscillator) 23, a P / S converter 24, an S / P converter 25, and an output FIFO 26. The DVB-ASI block 22 includes a data / sink stuffing unit 22-1, an 8-bit / 10-bit converter 22-2, a sink detector 22-3, and a frame generator 22-. 4) a frame control section 22-5 and a 10-bit / 8-bit conversion section 22-6.

Referring to the operation of the apparatus shown in Figure 2, the COFDM / QPSK / QAM decoder 20 demodulates the On-Air COFDM / QPSK / QAM modulated signal, it can be configured in any of three forms. The input FIFO 21, like the SMPTE310 block 12, serves as a buffer for extracting only pure 188 byte data components and sending them to the DVB-ASI block 22. The bit rate of DVB-ASI is 270Mbps, which transmits and receives 10 bits of data serially. Therefore, the frequency of the 10-bit parallel data is 27 MHz, and the clock for recording data from the COFDM / QPSK / QAM decoder 20 to the input FIFO 21 is about 6 MHz or less. In addition, since the clock reading data from the input FIFO 21 is 27 MHz, the input FIFO 21 frequently generates underflow. When the underflow occurs, the DVB-ASI block 22 converts the sync byte to the data. Will be sent). The data / sink stuffing unit 22-1 transmits a sync byte when an underflow occurs in the input FIFO 21, and serves as a kind of multiplexer that transmits data otherwise. The 8-bit / 10-bit converter 22-2 converts the parallel 8-bit data output from the data sink stuffing unit 22-1 into parallel 10-bit data. The P / S converter 24 converts the parallel data converted into 10 bits into serial data and outputs the serial data. The S / P converter 25 converts serial 10-bit data input from the outside into parallel 10-bit data. The sink detector 22-3 detects the sink component from the parallel converted 10 bit data. The frame generator 22-4 reconstructs the frame with respect to the parallel 10-bit data according to the sync detection result. The frame controller 22-5 controls the frame generator 22-4. The 10-bit / 8-bit converter 22-6 converts the parallel 10-bit data into 8-bit data. When 270 MHz serial data is converted into parallel data, it becomes 27 MHz. Typically, however, a transmission demultiplexer (not shown) can only receive a clock rate of less than 7.5 MHz for parallel transport stream data. Except for the actual sync stuffed data among the 27 MHz data, the actual pure data is about 6 MHz or less. Therefore, the output FIFO 26 serves as a buffer to remove the sync byte and drop only pure data components below about 6 MHz for transmission to the transmit demultiplexer.

As described above, the SMPTE310 board and the DVB-ASI board exist separately due to the polarization of the ATSC standard and the DVB standard. Therefore, broadcasting equipment is incurring a price burden for consumers by installing each of the SMPTE310 board and DVB-ASI board that satisfy both of these standards for smooth transmission and reception of a transport stream.

The technical problem to be achieved by the present invention is to ASIC each of the SMPTE310 board and DVB-ASI board in one chip, and to share the input and output terminals to efficiently transmit and receive the transport stream regardless of the equipment conforming to the ATSC standard and DVB standard To provide a device.

1 is a block diagram showing the configuration of a conventional SMPTE310 type transport stream transmission and reception apparatus.

2 is a block diagram showing the configuration of a conventional DVB-ASI transport stream transceiver.

3 is a block diagram showing the configuration of a transport stream transmission and reception apparatus according to the present invention.

According to an aspect of the present invention, there is provided a transport stream transmitting and receiving apparatus comprising: first storage means for storing a modulated transport stream having a different broadcast standard; In the first storage means, valid data in a transport stream is serially processed in a synchronous manner or asynchronously in accordance with a broadcast standard and output to the outside, and valid data in a transport stream input from the outside is synchronized in a synchronous manner according to a transmission standard. Signal processing means for parallel processing or asynchronous processing in parallel; Second storage means for storing the asynchronous transport stream processed in parallel in the signal processing means; And a selector for selecting a synchronous transport stream processed in parallel in the signal processing means or a parallel processed asynchronous transport stream stored in the second storage means according to a broadcast standard to separate the video signal and the audio signal. It is preferable.

The invention further includes switching means for switching the transport stream input and output to the signal processing means in accordance with the broadcast standard.

In the present invention, the signal processing means includes control means for determining a broadcast standard of the transport stream output from the first storage means and the outside and controlling signal processing of the transport stream according to the broadcast standard; A SMPTE310 block for serially / parallel processing a transmission stream of a synchronous method input through the control means and the outside when the broadcast standard is a synchronous method; And a DVB-ASI block for serially / parallel processing the asynchronous transport stream input through the control means and the external device when the air transport standard is asynchronous. The switching means comprises a relay and controls the control means. The SMPTE310 block or the DVB-ASI block is switched to input and output respective transport streams.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

3 is a block diagram showing the configuration of a transport stream transmission and reception apparatus according to the present invention.

The apparatus shown in FIG. 3 includes an input FIFO 30 that stores and outputs a modulated 8VSB broadcast signal (synchronous, broadcast signal of SMPTE310 standard) and a modulated COFDM broadcast signal (asynchronous, broadcast signal of DVB-ASI standard). Signal processing means 31 implemented in one chip to serially / parallel the SMPTE310 and DVB-ASI broadcast signals output from the input FIFO 30 and the SMPTE310 and DVB-ASI broadcast signals input from the outside; First switching means 32 for switching the SMPTE310 and DVB-ASI broadcast signals to the outside, second switching means 33 for switching the SMPTE310 and DVB-ASI broadcast signals input from the outside to the signal processing means 31, and the signal An output FIFO 34 for storing and outputting the processed DVB-ASI broadcast signal, a multiplexer 34 for selecting a SMPTE310 broadcast signal or a DVB-ASI broadcast signal output from the output FIFO 34 according to a selection control signal It consists of.

In the present invention, the signal processing means 31 is the control means (31-1) and the control means (31-1) of judging and controlling the specifications of the input FIFO 30 and the SMPTE310 and DVB-ASI broadcast signals output from the outside. When the broadcast standard is a synchronous method under the judgment, the broadcast is determined under the judgment of the control means 31-1 and the SMPTE310 block 31-2 and the control means 31-1 which process the SMPTE310 broadcast signal input through the outside. When the standard is asynchronous, the control means 31-1 and a DVB-ASI block 31-2 for serially / parallel processing the DVB-ASI broadcast signal input through the outside.

Next, the present invention will be described in detail with reference to FIG. 3.

The input FIFO 30 stores and outputs a modulated 8VSB broadcast signal (synchronous method, SMPTE310 broadcast signal) and a modulated COFDM broadcast signal (asynchronous method, DVB-ASI broadcast signal). The SMPTE310 and DVB-ASI broadcast signals (hereinafter referred to as transport streams) modulated by the broadcast signal receiving end are divided into data and valid clocks, and the input FIFO 30 processes only pure 188-byte data components among them. It serves as a buffer for transmission to the means 31. Unlike the prior art, the present invention shares the input FIFO 30 regardless of the SMPTE310 or DVB-ASI scheme.

The control means 31-1 determines the broadcast rate from the transport stream input from the input FIFO 30. The transport stream consists of 188 bytes and is divided into header, video and video signals. The control unit 31-1 searches the header portion of the transport stream to determine whether the currently input transport stream is the synchronous SMPTE310 standard or the asynchronous DVB-ASI ??. When the header search result of the control means 31-1 is the SMPTE310 standard of the synchronous method, the transport stream input from the input FIFO 30 is transmitted to the SMPTE310 block 31-2, and the control means 31-1. When the transport stream of the header search result is asynchronous DVB-ASI standard, the transport stream input from the input FIFO 30 is transmitted to the DVB-ASI block 31-3.

The control means retrieves the header of the transport stream input from the outside (a broadcast signal storage medium such as a hard disk or a CD-ROM), and if the header search result indicates that the transport stream is the synchronous SMPTE310 standard, The transport stream inputted from the input FIFO 30 when the transport stream inputted is transmitted to the SMPTE310 block 31-2 and the header search result of the control means 31-1 is the asynchronous DVB-ASI standard. Is transmitted to the DVB-ASI block 31-3.

In addition, the control means 31-3 controls the switching of the first and second switching means 32-33 described below, and controls the selection of the multiplexer 35.

The SMPTE310 block 31-2 serially / parallelizes the SMPTE310 transport stream input through the control unit 31-1 and the outside. Although not shown, the SMPTE310 block 31-2 includes a P / S converter, a bipolar phase coding unit, a bipolar phase decoding unit, an S / P converter, and a PLL control unit to perform parallel processing on an input SMPTE310 transport stream. An anode phase coding / decoding process is performed and a synchronization operation is performed.

The DVB-ASI block 31-3 serially / parallelly processes the DVB-ASI transport stream input through the control means 31-1 and the outside. Although not shown, the DVB-ASI block 31-3 includes a data / sink stuffing unit, an 8-bit / 10-bit converter, a P / S converter, an S / P converter, a sink detector, a frame generator, and a frame controller. It consists of a 10-bit / 8-bit converter that transmits a transport stream, performs bit conversion, performs parallel processing, detects sync, and regenerates a frame whenever an underflow occurs.

In the signal processing means 31 of the present invention, since the control means 31-1, the SMPTE310 block 31-2, and the DVB-ASI block 31-3 are one-chip, broadcasting equipment is compared with the prior art. It can reduce the space of rear panel and reduce the burden of consumer's expense in purchasing equipment.

The first switching means 32 is configured as a relay to externally switch the transport stream signaled by the SMPTE310 block 31-2 or the DVB-ASI block 31-3 under the control of the control means 31-1. . When the header search result broadcast standard of the control means 31-1 is SMPTE310, the first switching means 32 switches the SMPTE310 block 31-2 to output the signal-processed synchronous transport stream to the outside. When the broadcast search result of the header search result of the control means 31-1 is DVB = ASI standard, the DVB-ASI block 31-3 is switched to output the signal-processed asynchronous transport stream to the outside.

The second switching means 33 is also configured as a relay to switch the transport stream input externally under the control of the control means 31-1 to the SMPTE310 block 31-2 or the DVB-ASI block 31-3. . When the broadcast standard of the transport stream input from the outside of the header search result of the control means 31-1 is SMPTE310, the second switching means 33 switches the SMPTE310 block 31-2 to SMPTE310 block 31-2. Signal processing of the synchronous transport stream, and when the broadcast standard of the transport stream inputted from the outside of the header search result of the control unit 31-1 is DVB = ASI standard, the DVB-ASI block 31-3 Switch so that the DVB-ASI block 31-3 signals the asynchronous transport stream.

The output FIFO 34 stores and outputs the DVB-ASI broadcast signal processed in the DVB-ASI block 31-3.

The multiplexer 35 selects a synchronous transport stream signal-processed in the SMPTE310 block or an asynchronous transport stream output from the output FIFO 34 under the control of the control unit 31-1 to separate the video and audio signals. Output to a transport stream demultiplexer (not shown).

The present invention is not limited to the above-described embodiments and can be modified by those skilled in the art within the spirit of the invention.

As described above, according to the present invention, each SMPTE310 board and DVB-ASI board can be ASIC into one chip, and input / output terminals can be shared to efficiently transmit and receive a transport stream regardless of equipment conforming to the ATSC standard and the DVB standard. In addition, it can reduce the space of the rear panel of the equipment, and it can reduce the burden on the consumer according to the equipment purchase.

Claims (4)

First storage means for storing a modulated transport stream having a different broadcast standard; In the first storage means, valid data in a transport stream is serially processed in a synchronous manner or asynchronously in accordance with a broadcast standard and output to the outside, and valid data in a transport stream input from the outside is synchronized in a synchronous manner according to a transmission standard. Signal processing means for parallel processing or asynchronous processing in parallel; Second storage means for storing the asynchronous transport stream processed in parallel in the signal processing means; And A transmission including a selector for selecting a synchronous transport stream processed in parallel in the signal processing means or a parallel processed asynchronous transport stream stored in the second storage means according to a broadcast standard to separate the video signal and the audio signal. Stream transceiver. The method of claim 1, And a switching means for switching a transport stream input and output to the signal processing means according to the broadcast standard. The method of claim 1, wherein the signal processing means Control means for determining a broadcast standard of the first storage means and a transport stream output from the outside and controlling signal processing of the transport stream according to the broadcast standard; A SMPTE310 block for serially / parallel processing a transmission stream of a synchronous method input through the control means and the outside when the broadcast standard is a synchronous method; And And a DVB-ASI block for serially / parallel processing the asynchronous transport stream inputted through the control means and the outside when the air transport standard is asynchronous. The method of claim 3, wherein the switching means And a relay, wherein the SMPTE310 block or the DVB-ASI block is switched under the control of the control means to input and output each transport stream.