KR20010036732A - apparatus for interfacing channel in digital broadcasting receiver - Google Patents

Abstract

PURPOSE: A channel interface device for a digital broadcasting receiver is provided to detect a sync byte before writing decoded data from a channel decoding unit in a storing unit and writes data by a packet. CONSTITUTION: A tuner(100) tunes a signal received from an antenna as a certain band. A channel decoding unit(200) decodes a channel from the signal tuned in the tuner(100). A channel interfacing unit(300) detects a sync byte from the signal decoded in the channel decoding unit(200) and writes data from a certain position of a storing unit(400). A transport demultiplexing unit(500) reads a signal stored in the storing unit(400) from the certain position and demultiplexes the read signal.

Description

Channel interface device of digital broadcasting receiver {apparatus for interfacing channel in digital broadcasting receiver}

The present invention relates to a digital broadcast receiver, and more particularly, to a channel interface device of a digital broadcast receiver.

The transport demultiplexer (hereinafter abbreviated as TP) for digital TVs uses a channel clock (chclk), channel data (chdata), channel start of packet (chsop) signals, error signals, and channels from a channel decoder. A valid signal is received.

In this case, the transport stream, which is channel data, has a sync field indicating the start of a packet, and thus a channel start-off packet (chsop) signal may be omitted.

All of these signals have a stable value at the rising of the channel clock, and therefore, to be used as the operation clock tpclk of the transport demultiplexer, it is necessary to solve the async generated between chclk and tpclk.

Hereinafter, a channel interface apparatus of a digital broadcast receiver according to the prior art will be described with reference to the accompanying drawings.

1 is a diagram illustrating an example of a channel interface apparatus of a digital broadcast receiver according to the prior art, and includes a channel interface unit 1 for interfacing and outputting a signal output from a channel decoder (not shown), and the channel interface unit 1. It consists of an input buffer (2) for storing the signal output from the ().

The channel interface unit 1 includes a first flip-flop 1a for delaying the channel data chdata output from the channel decoder by a predetermined time according to a channel clock chclk, and a write address write_addr of the input buffer. A second flip-flop 1c for delaying the generated address generator 1b, the channel data chdata output from the channel decoder, by a predetermined time according to the operation clock tpclk of the transport demultiplexer, and the second flip A third flip-flop 1d for delaying the channel clock 1 delay (chclk_1d) signal output from the flop 1c for a predetermined time according to the transport clock, and a channel clock 2 delay output from the third flip-flop 1d ( a fourth flip-flop 1e for delaying the chclk_2d signal by a predetermined time according to the transport clock, a channel clock 2-delay (chclk_2d) signal output from the third flip-flop 1d, and the fourth flip-flop 1e The first AND gate 1f for ANDing the channel clock 3-delay (chclk_3d) signal output from the < RTI ID = 0.0 > 1) < / RTI > and the channel channel valid signal output from the channel decoder is delayed for a predetermined time in accordance with the channel clock chclk. A fifth flip-flop 1g, a sixth flip-flop 1h for delaying a channel error signal output from the channel decoder for a predetermined time according to a channel clock, and a channel start of packet chsop output from the channel decoder. ) A seventh flip-flop 1i for delaying a predetermined time according to the channel clock chclk, a channel clock latch (chclk_latch) signal output from the first and gate 1f, and the fifth flip-flop 1g. And a second AND gate 1j that logically multiplies the channel valid delay (chvalud_d) signal outputted from the channel error signal and the channel error signal outputted from the sixth flip-flop 1h.

The operation of the channel interface apparatus of the conventional digital broadcast receiver configured as described above will be described in detail with reference to the accompanying drawings.

First, the channel interface unit 1 interfaces and outputs a signal output from a channel decoder (not shown).

That is, the first flip-flop 1a in the channel interface unit 1 delays the channel data chdata output from the channel decoder according to the channel clock chclk for a predetermined time and then outputs the resultant signal.

The address generator 1b also generates a write address write_addr of the input buffer 2.

Here, the address generator 1b increases the write address write_addr by one each time the write enable is '1' starting from '0'.

The second flip-flop 1c delays the channel data chdata output from the channel decoder according to the operation clock tpclk of the transport demultiplexer for a predetermined time and then outputs a channel clock 1 delay chclk_1d signal.

Accordingly, the third flip-flop 1d delays the channel clock 1 delay (chclk_1d) signal output from the second flip-flop 1c by a predetermined time according to the operation clock tpclk of the transport demultiplexer. A delay (chclk_2d) signal is output.

Then, the fourth flip-flop 1e delays the channel clock 2-delay (chclk_2d) signal output from the third flip-flop 1d according to the operation clock tpclk of the transport demultiplexer and then delays the channel clock by 3 delays. Outputs the (chclk_3d) signal.

Accordingly, the first AND gate 1f outputs the channel clock 2-delay (chclk_2d) signal output from the third flip-flop 1d and the channel clock 3-delay (chclk_3d) signal output from the fourth flip-flop 1e. Multiply by and outputs the channel clock latch chclk_latch) signal.

The channel clock latch (chclk_latch) signal finds a section in which the channel data delay (chdata_d) signal is synchronized with the operation clock (tpclk) of the transport demultiplexer in a stable section and goes high only during the section. It is a signal to keep.

In addition, the fifth flip-flop 1g delays a channel valid signal output from the channel decoder by a predetermined time according to the channel clock chclk, and then outputs a channel valid delay signal.

The sixth flip-flop 1h delays a channel error signal output from the channel decoder by a predetermined time according to the channel clock chclk and then outputs a channel error delay signal cherror_d.

In addition, the seventh flip-flop 1i delays a start of packet (chsop) signal output from the channel decoder according to the channel clock (chclk) for a predetermined time and then outputs a channel start of packet delay (chsop_d) signal.

Accordingly, the second AND gate 1j includes the channel clock latch (chclk_latch) signal output from the first and gate 1f, the channel valid delay signal output from the fifth flip-flop 1g, and the sixth The channel error cherror signal output from the flip-flop 1h is ANDed and the write enable signal is output.

The input buffer 2 then stores the signal output from the channel interface unit 1 and the stored signal is drawn out to the TP.

When the channel start of packet (chsop) signal is present, the channel data (chdata), that is, the write address (write_addr) in which the sync byte is stored, is stored when the channel start of packet (chsop) signal occurs. When the TP reads data at that address, it emits an internal start of packet (internal sop) signal.

When the channel start of packet (chsop) signal does not exist, the internal start of packet (internal sop) signal is displayed by searching for the sync byte (sync byte) by the sync detection (sync detection) algorithm in the TP.

However, the channel interface apparatus of the digital broadcasting receiver according to the prior art detects the sync field of the packet when the decoded signal is sequentially written to the input buffer by the channel decoder and then the signal written to the TP is fetched. Therefore, there is a problem in that async occurs between the write clock of the input buffer and the draw clock of the TP.

In addition, when a channel start of packet (chsop) signal is present, it is difficult to correctly respond to the channel error (cherror) signal.

That is, when a channel start of packet signal exists, the channel error signal may come in two ways.

The first means that if a packet is broken, the channel start of packet (chsop) signal will float at the same time while discarding the packet, and the second will tell you to drop the packet while continuing to float while data from the broken packet comes in. Will be.

When the conventional method is applied, the latter responds correctly to the channel error signal such as the latter, but in the former case, the sync byte is discarded and the internal sop signal is floated to the next byte of the sink. There is also a problem.

Accordingly, the present invention has been made to solve the above problems, and to write the data in packet units after detecting the sync byte before writing the decoded data from the channel decode unit to the storage unit. It is an object of the present invention to provide a channel interface device of a digital broadcast receiver.

1 is a diagram illustrating an example of a channel interface apparatus of a digital broadcast receiver according to the prior art.

2 is a view showing an embodiment of a channel interface apparatus of a digital broadcast receiver according to the present invention.

3 is a diagram illustrating a detailed configuration of a channel interface unit of FIG. 2.

4 is a diagram illustrating a detailed configuration of a timing adjusting unit of FIG. 2;

5 is a diagram illustrating an operating state of the sink detect / write address generator of FIG. 3;

FIG. 6 is a diagram illustrating a detailed configuration of the write enable controller of FIG. 3. FIG.

FIG. 7 is a diagram illustrating a detailed configuration of a valid signal generator of FIG. 6. FIG.

8 is a diagram illustrating a detailed configuration of an error signal generator of FIG. 6;

FIG. 9 is a diagram illustrating a detailed configuration of a channel clock stabilizer of FIG. 6.

10 is a diagram illustrating a detailed configuration of a light enable generation unit of FIG. 6;

11 is a view showing the waveform of each part according to the present invention

Explanation of symbols for main parts of the drawings

100: tuner 200: channel decode unit

300: channel interface unit 310: timing adjustment unit

320: Sink detect / write address generator

330: light enable control unit 400: storage unit

500: Transport demultiplex unit (TP)

A channel interface apparatus of a digital broadcast receiver according to the present invention for achieving the above object is characterized in that, in a channel interface apparatus of a digital broadcast receiver having a channel decode unit and a storage unit, the signal is decoded by the channel decode unit. And a channel interface unit controlling to write data from a predetermined position of the storage unit after detecting the sync byte, and a transport demultiplex unit which demultiplexes a signal stored in the storage unit from a predetermined position. It is composed.

The channel interface unit may adjust a timing of the channel data chdata decoded by the channel decode unit according to a channel data chdata_ok, and output a data. The channel interface decoded by the channel decode unit. (chdata), the channel start of packet (chsop) signal and the start of packet type (sop_type) signal set by the user to the channel data chdata_ok signal, error (error) and channel data table (chdata_stable) signal The sync detect / write address generator for outputting a write address (write_addr) and a write enable temp (wen_temp) signal for storing data in units of packets after detecting the sync, and the sync detect / write address generator Enable enable temp (wen_temp) signal, channel error (cherror) signal, channel valid signal (chvalid) and channel clock (chclk) And a write enable control unit for outputting a ride enable signal write_en according to a valid_active signal and a start of packet type set by the user.

According to an embodiment of the present invention, before the data decoded in the channel decoder is written to the storage, the sync byte is searched and the data is written in packet units so that the error signal can be responded to according to whether a start of packet is performed. Can be.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, a preferred embodiment of a channel interface apparatus of a digital broadcast receiver according to the present invention will be described with reference to the accompanying drawings.

2 is a diagram illustrating an embodiment of a channel interface apparatus of a digital broadcast receiver according to the present invention, and includes a tuner 100 for tuning a signal received from an antenna to a predetermined band and a signal tuned from the tuner 100. A channel decode unit 200 for decoding a channel, and a channel interface controlling to write data from a predetermined position of the storage unit 400 after detecting a sync byte from a signal decoded by the channel decode unit 200. A unit 300 and a transport demultiplex unit (TP) 500 for demultiplexing a signal stored in the storage unit 400 from a predetermined position.

The storage unit 400 has a size capable of storing two packet units.

3 is a diagram illustrating a detailed configuration of the channel interface of FIG. 2. The timing of outputting data by adjusting the timing of the channel data chdata decoded by the channel decoding unit 200 according to the channel data ok data chch_ok signal. The control unit 310 and the channel data decoded by the channel decoder 200, the channel start of packet (chsop) signal, and the start of packet type (sop_type) signal set by the user are converted into channel data ok ( Sink that detects sync according to chdata_ok, error signal, and chdata_stable signal, and then outputs write address (write_addr) and write enable temp (wen_temp) signal for storing data in packet units. The detect / write address generator 320 and the write enable temp (wen_temp) signal and channel output from the sync detect / write address generator 320 are output to the channel. Outputs a write enable signal according to a cherror signal, a channel valid signal, a channel clock chclk, a valid_active signal, and a start of packet type set by a user. The light enable control unit 330 is configured.

FIG. 4 is a diagram illustrating a detailed configuration of the timing controller of FIG. 2. The first flip-flop 311 delays a decoded channel data chdata in the channel decoder 200 by a predetermined time according to a channel clock chclk. And a mux 312 for muxing the channel data delay (chdata_d) signal output from the first flip-flop 311 according to the channel data ok data (chdata_ok) signal, and transporting the mux signal from the mux 312. It consists of a second flip-flop 313 delaying a predetermined time according to the operation clock tpclk of the demultiplexer.

FIG. 5 is a diagram illustrating an operation state of the sink detect / write address generator of FIG. 3, and FIG. 6 is a diagram illustrating a detailed configuration of the write enable controller of FIG. 3. The valid_active signal set by a user is illustrated. And a valid signal generator 331 for generating a valid signal from the channel valid signal according to the valid watch signal, an error active signal and an error watch set by the user. The transport demultiplexer includes an error signal generator 332 for outputting an error signal from a channel error signal according to an error_watch signal, and a channel clock chclk decoded by the channel decoder 200. The channel clock chclk stabilizer 333 stabilizes and outputs the stabilized signal according to the operation clock tpclk, and the valid signal and error signal generator 332 generated by the valid signal generator 331. From) An error signal, a channel clock latch (chclk_latch) signal output from the channel clock (chclk) stabilizer 333, and a start of packet type (sop_type) signal set by the user are written to the write enable temp (wen_temp) signal. The write enable generator 334 outputs a channel data ok data, a chdata_stable signal, and a write enable signal write_en.

FIG. 7 is a diagram illustrating a detailed configuration of a valid signal generator of FIG. 6, wherein a channel valid delay signal and a user whose channel decoded signal is decoded by the channel decoder 200 are delayed by a predetermined time. The first exclusive or gate 331a which exclusively ORs the valid_active signal set by the second signal, the signal output from the first exclusive or gate 331a and the valid watch set by the user. and a NAND gate 331b that negatively multiplies the (valid_watch) signal.

FIG. 8 is a diagram illustrating a detailed configuration of the error signal generator of FIG. 6. The channel error delay (cherror_d) signal obtained by delaying a channel error signal decoded by the channel decoder 200 by a predetermined time and set by a user is shown in FIG. A second exclusive or gate 332a which exclusively ORs the received error active signal and an error watch set by the user and a signal output from the second exclusive or gate 332a And a first or gate 332b for ORing the signals.

FIG. 9 is a diagram illustrating a detailed configuration of a channel clock chclk stabilizer of FIG. 6, wherein a channel clock chclk decoded by the channel decoder 200 is predetermined according to an operation clock tpclk of the transport demultiplexer. A third flip-flop 333a for delaying and a fourth flip-up delay for a predetermined time from the channel clock one delay chclk_1d signal output from the third flip-flop 333a according to the operation clock tpclk of the transport demultiplexer. A fifth flip-flop 333c for delaying the flop 333b and the channel clock 2-delay chchk_2d signal output from the fourth flip-flop 333b according to the operation clock tpclk of the transport demultiplexer; And a logic signal of the channel clock 3-delay (chclk_3d) signal output from the fifth flip-flop 333c and the channel clock 2-delay (chclk_2d) signal output from the fourth flip-flop 333b. The first consists of the AND gate (333d) to.

FIG. 10 is a diagram illustrating a detailed configuration of the write enable generation unit of FIG. 6, wherein the channel clock latch chclk_latch output from the channel clock chclk stabilizer 330 and the validity output from the channel decoder 200 are valid. a second AND gate 334a for ANDing the signal, and a second OR for ANDing the error signal outputted from the channel decoder 200 and the start of packet type signal set by the user. Or gate 334b, a third AND gate 334c that logically multiplies the channel data chdata_stable signal output from the second and gate 334a, and the signal output from the second or gate 334b; And a sixth flip-flop 334d for delaying the channel data chdata_ok signal output from the third and gate 334c by a predetermined time according to the operation clock tpclk of the transport demultiplexer, and the sink detect / To the fourth AND gate 334e that logically multiplies the write enable temp signal wen_temp signal output from the write address generator 320 and the channel data ok delay chdata_ok_d signal output to the sixth flip-flop 334d. It is composed.

11 is a view showing the waveform of each part according to the present invention

The operation of the channel interface apparatus of the digital broadcast receiver according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the tuner 100 tunes the signal received from the antenna to a predetermined band.

Then, the channel decode unit 200 decodes a channel from the signal tuned by the tuner 100, thereby channel clock (chclk), channel data (chdata), and channel start of packet (chsop) signal, FIG. 11. An error signal and a valid signal are output as shown in FIG.

Subsequently, the channel interface unit 300 detects the sync byte from the signal decoded by the channel decoder 200 and then controls to write data from a predetermined position of the storage unit 400.

That is, as shown in FIG. 3, the timing adjusting unit 310 in the channel interface unit 300 determines the timing of the channel data chdata decoded in the channel decoding unit 200 as shown in FIG. 11. The channel data 2 delay (chdata-2d) as shown in FIG. 11 is output by adjusting according to the (chdata_ok) signal.

The channel data ok data is a data transport stream TS, and an error signal does not occur regardless of the start of packet type during a stable period, such as when there is no start of packet signal. It is the value which selected the notation line.

That is, as shown in FIG. 4, the first flip-flop 311 in the timing adjusting unit 310 stores the channel data chdata decoded in the channel decoding unit 200 as shown in FIG. 11. According to chclk, a predetermined time delay is outputted as a result signal. The mux 312 muxes the channel data delay chdata_d signal output from the first flip-flop 311 according to the channel data chdata_ok signal as shown in FIG. 11 and outputs the result signal. Subsequently, the second flip-flop 313 delays the mux signal from the mux 312 by a predetermined time according to the operation clock tpclk of the transport demultiplexer as shown in FIG. 11 and outputs the resultant signal data. .

The sink detect / write address generator 320 in the channel interface 300 is set by the channel data (chdata) signal, the channel start of packet (chsop) signal, and the user decoded by the channel decoder 200. A write address for storing data in packet units after detecting a sync according to the start_pack type (sop_type) signal according to the channel data chdata_ok signal, the error signal and the channel data table data chdata_stable signal. addr) and a write enable temp (wen_temp) signal.

The start of packet type (sop_type) signal determines whether the start off packet (sop) signal is valid ('1') or not ('0').

Here, the sink detect / write address generator 320 searches for the start of packet type signal set by the user in the reset state, and then the start off packet type signal set_so_type signal is '0'. If not, it determines that the signal is not a valid signal and transitions to a state for searching for sync bytes (S1, S2).

If the channel data chdata_ok signal is '1' and the channel data delay (chdata_d) signal is 'Ox47', the write address is set to '0' or '188' and the write enable temp is wen_temp. The signal is set to '1' to transition to a state for locking sync (S3).

The channel data chdata_ok signal is '1' and the write address (write_addr) is '187' or '375' after the channel data 2 delay (chdata_2d) signal is locked to the storage unit 400 in the S3 state. If the channel data delay (chdata_d) signal is Ox47 and the write enable temp signal (wen_temp) is '0', the state transitions to the S2 state. If the channel data delay (data_ok) signal is '1', the previous write address (write_addr) is performed. Set the write address (write_addr) to the value of '1'.

In addition, if the start_of_pack type (sop_type) signal is '1', it is determined to be a valid signal and then transitions to a state for searching for the start of packet SOP (S4).

In the S4 state, if the channel data table data chch_stable signal is '1', the channel start of packet delay signal chdata_d is '1', and the error signal is '1', the start of packet normal ( After the transition to the SOP_normal state (S5), if the channel data table (chdata_stable) signal is '1', the channel start of packet delay (chdata_d) signal is '1', and the error signal is '0', the start is performed. Transition to the SOP_error state.

In the S4 state, if the channel data table data (chdata_stable) signal is '1', the channel start of packet delay (chdata_d) signal is '1', and the error signal is '0', the start of packet error ( After the transition to the SOP_error state (S6), if the channel data chdata_stable signal is '1', the channel start of packet delay (chdata_d) signal is '1', and the error signal is '1', the start of Transition to the packet normal state (SOP_normal) (S6).

Accordingly, the write enable controller 330 may write a write enable temp signal wen_temp signal, a channel error signal, a channel valid signal, and a channel clock output from the sync detect / write address generator 320. The write enable signal write_en is output according to a chclk, a valid_active signal, and a start of packet type signal set by the user.

That is, the valid signal generator 331 in the write enable control unit 330 has a channel according to a valid_active signal and a valid watch signal set by a user as shown in FIG. 6. A valid signal is generated from the valid signal.

The valid signal is processed by the user by setting a register called active and a watch, and the active is low active ('0') or high active. register that determines whether it is high active ('1'), and the watch determines whether to view valid and error signals ('1') or ignore it ('0'). Is a register.

That is, as shown in FIG. 7, the first exclusive or gate 331a in the valid signal generator 331 receives the channel valid signal decoded by the channel decoder 200 for a predetermined time. An exclusive negative OR is performed on the delayed channel data delay (chvalid_d) signal and a valid_active signal set by the user, and the resultant signal is output. Then, the NAND gate 331b negatively multiplies the signal output from the first exclusive or gate 331a and the valid watch_set signal set by the user and outputs the resultant signal.

In addition, the error signal generator 332 in the write enable controller 330 may receive an error signal from a channel error signal according to an error active signal and an error watch signal set by a user. Output

The error signal is processed by the user by setting registers called active and watch, and active is low active ('0') or high active. register that determines whether it is high active ('1'), and the watch determines whether to view valid and error signals ('1') or ignore it ('0'). Is a register.

That is, as shown in FIG. 8, the second exclusive or gate 332a in the error signal generator 332 delays the cherror decoded by the channel decoder 200 by a predetermined time (cherror_d). The signal and the error active (error_active) set by the user are exclusively negated and output the resultant signal. Then, the first or gate 332b logically combines the signal output from the second exclusive or gate 332a with the error watch (error_watch) set by the user and outputs the resultant signal.

The channel clock chclk stabilizer 333 in the write enable controller 330 stabilizes the channel clock chclk decoded by the channel decoder 200 according to the operation clock tpclk of the transport demultiplexer. Output

That is, as illustrated in FIG. 9, the third flip-flop 333a in the channel clock chclk stabilization unit 333 performs operation of the transport demultiplexer on the channel clock chclk decoded by the channel decode unit 200. The predetermined time is delayed according to the clock tpclk, and the resultant signal is output. Then, the fourth flip-flop 333b delays the channel clock 1 delay (chclk_1d) signal output from the third flip-flop 333a by a predetermined time according to the operation clock tpclk of the transport demultiplexer and outputs the resultant signal. do. Next, as shown in FIG. 11, the fifth flip-flop 333c receives a channel clock 2-delay chchk_2d signal outputted from the fourth flip-flop 333b according to the operation clock tpclk of the transport demultiplexer. Delay and output the result signal. Then, the first AND gate 333d is output from the negated signal of the channel clock 3-delay chchk_3d signal output from the fifth flip-flop 333c and the fourth flip-flop 333b as shown in FIG. 11. The resultant signal is multiplied by the channel clock 2-delay (chclk_2d) signal.

Then, the write enable generator 334 may include a valid signal generated by the valid signal generator 331, an error signal output from the error signal generator 332, and a signal of FIG. 11. As described above, the channel clock latch (chclk_latch) signal output from the channel clock (chclk) stabilization unit 333 and the start of packet type (sop_type) signal set by the user according to the write enable temp (wen_temp) signal channel data. A ok data (chdata_ok) signal, a channel data table (chdata_stable) signal, and a write enable signal (write_en) signal are output.

The channel data chtable_stable signal considers a valid value for the channel clock latch chclk_latch signal.

That is, as shown in FIG. 10, the second AND gate 334a in the write enable generation unit 334 is the channel clock latch (chclk_latch) signal output from the channel clock chclk stabilizer 330 and the channel clock latch (chclk_latch) signal. The valid signal output from the channel decoder 200 is ANDed and the resultant signal is output. Then, the second or gate 334b logically combines the signal (error) output from the channel decoder 200 with the start of packet type (sop_type) signal set by the user and outputs the resultant signal. Subsequently, the third AND gate 334c multiplies the channel data chdata_stable signal output from the second and gate 334a and the signal output from the second or gate 334b and outputs the resultant signal. . Then, the sixth flip-flop 334d delays the channel data ok data output from the third and gate 334c by a predetermined time according to the operation clock tpclk of the transport demultiplexer and outputs the resultant signal. . Accordingly, the fourth AND gate 334e is output to the write enable temp signal wen_temp signal output from the sink detect / write address generator 320 and to the sixth flip-flop 334d as shown in FIG. 11. The received channel data ok delay (chdata_ok_d) signal is ANDed and output.

The channel data ok data (chdata_ok) is an error in consideration of the channel data chdata_stable signal.

Then, the transport demultiplexer (TP) 500 extracts a signal stored in the storage unit 400 from a predetermined position, demultiplexes the signal, and outputs the demultiplexed signal to an audio / video decode unit (not shown).

As described above, the channel interface apparatus of the digital broadcast receiver according to the present invention may write the data in packet units after searching for the sync byte before writing the decoded data in the channel decoder to the storage unit. Therefore, there is an effect that the error signal can be responded to according to whether the start of packet (sop).

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (2)

A channel interface apparatus of a digital broadcast receiver having a channel decode unit and a storage unit, A channel interface unit controlling to write data from a predetermined position of the storage unit after detecting the sync byte from the signal decoded by the channel decoder; And a transport demultiplex unit configured to extract and demultiplex the signal stored in the storage unit from a predetermined position. The method of claim 1, The channel interface unit A timing adjusting unit for adjusting the timing of the channel data chdata decoded by the channel decoding unit according to a channel data ok data and outputting data; Channel data (chdata) signal, channel start of packet (chsop) signal decoded by the channel decoder, and start of packet type (sop_type) signal set by the user. A write enable temp signal wen_temp signal, a channel error signal, a channel valid signal, an operation clock of the transport demultiplexer, and a valid_active signal output from the sink detect / write address generator. And a write enable control unit for outputting a write enable signal according to a signal and a start of packet type (sop_type) signal set by the user.