KR100317801B1 - Apparatus and method for saving/reviving of broadcasting signal for digital television - Google Patents

Abstract

The present invention relates to a device for storing or reproducing a digital TV signal and a method thereof, comprising an input / output unit for inputting or outputting a digital TV signal, an operation signal input unit for inputting an external operation signal of a user, and a digital TV signal. A storage unit for storing and comparing a signal input or output through the input / output unit with a DTV signal selected by the user through the manipulation signal input unit, and comparing and selecting only a signal whose result matches the output unit; A time information processing unit for generating time information on the transmission time interval between packets generated according to the standard of the digital TV signal, or deleting the time information, and a digital input through the input / output unit to be stored in the storage unit; Temporarily storing a digital TV signal read by means in the storage unit for output via a TV signal or the input / output unit Is a buffer unit, a buffer controller for monitoring a state of the buffer unit and generating a control signal informing the input / output time of the buffer unit, and the comparison unit and time information by a user's operation signal input through the operation signal input unit. The main control unit controls the operation of the processing unit and controls the operation of the storage means by the control signal of the buffering control unit. The digital control unit freely selects the desired digital TV signal and stores it in a separate storage device. To play back at the desired time.

Description

Apparatus and method for saving / reviving of broadcasting signal for digital television}

The present invention relates to a device for storing or reproducing a digital TV signal and a method thereof, and more particularly, to freely select and store a digital TV signal transmitted with a packet-specific number as a packet unit data in a separate storage device, An apparatus and method for storing or reproducing a digital TV signal, characterized by enabling a digital TV signal to be reproduced at a desired time.

Digital television (DTV), such as the Digital High Definition Televesion (HDTV) system used for U.S. terrestrial broadcasting under the ATSC (Advanced Television Sub-Committee) standard, has a higher resolution than the current analog TV. Much higher (e.g. 1080 * 1920) wider in the horizontal direction (determined 16: 9 to accommodate the movie's aspect ratio 4: 3.5: 3.1.85: 1.2.4: 1, etc.) The advantage is that it is supplied in multiple channels (up to 5.1 channels).

Such digital TVs are being standardized by the US, Europe, and Japan in their own broadcasting methods and standards. In the United States, the transmission format adopts the residual sideband (VSB) method proposed by Zenith in the United States, MPEG (Moving Picture Expert Group) for video compression, and Dolby AC-3 for audio compression. The display format is defined to be compatible with existing display methods.

At this time, the MPEG transmits data in packet units, and the packet has a unique packet identifier (ID) for each packet and is a 188 byte transport stream (TS). It is composed.

Currently, such a DTV signal is generally received through an indoor receiver such as a set-top box, and then converted into an analog form and output through a general TV.

However, when receiving a DTV signal through such a set-top box, there is a disadvantage in that a desired program cannot be stored or played at a desired time.

Accordingly, in the present invention, in order to solve the above problems, a desired DTV signal may be freely selected and stored in a separate storage device, and the stored DTV signal may be reproduced at a desired time. It is an object of the present invention to provide a reproducing apparatus and a method thereof.

In order to achieve the above object, a digital TV signal storage and reproducing apparatus provided by the present invention is input / output means for inputting or outputting a digital TV signal transmitted with a unique number for each packet as packet data, and a user. An operation signal input means for inputting an external operation signal of a signal, a storage means for storing the digital TV signal, and a signal input or output through the input / output means matches a signal selected by the user through the operation signal input means; Comparison time for selecting and outputting only signals whose results match, and time for generating time information on the transmission time interval between packets generated according to the standard of the digital TV signal, or deleting the time information. A digital TV signal or the input / output to be inputted through the information processing means and the input / output means to be stored in the storage means. Buffering means for temporarily storing the digital TV signal read out from the storage means for output through the output means, and buffering control means for monitoring a state of the buffering means and generating a control signal informing the input / output timing of the buffering means. And a main control for controlling the operation of the comparison means and the time information processing means by the user's operation signal input through the operation signal input means, and controlling the operation of the storage means by the control signal of the buffering control means. It is characterized by consisting of means.

On the other hand, in order to achieve the above object, the method for storing and reproducing a digital TV signal provided by the present invention is a signal to be stored by a unique number for each packet of the digital TV signal when the user selects storage of a desired signal by an external operation. And storing the time information about the transmission time interval between packets of the digital TV signal in the packet, and storing the time signal when the user selects reproduction of a desired signal by an external operation. And extracting a unique number of the data to identify a corresponding signal, delaying the transmission time interval between packets included in the time information, and deleting and outputting the time information.

1 is a block diagram of a digital TV signal output apparatus to which the present invention is applied;

2 is a block diagram of an apparatus for storing and reproducing a digital TV signal according to an embodiment of the present invention;

3 is a block diagram showing an operating state of a FIFO according to an embodiment of the present invention;

4 is a timing diagram showing general TS packet data and a TS valid signal;

5 is a data format of TS packet data reconstructed by the present invention;

6 is a flowchart illustrating a method of storing and reproducing a digital TV signal according to an embodiment of the present invention;

7 is a flowchart illustrating a method of storing a digital TV signal according to an embodiment of the present invention;

8 is a flowchart illustrating a method of reproducing a digital TV signal according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: Settop box 200: Recording and Playback Device

210: TS data input / output unit 220: PID comparator

230: time information processor 240: FIFO

241: first FIFO 242: second FIFO

250: HDD 260: FIFO control unit

270: operation signal input unit 280: CPU

Hereinafter, an apparatus and method for storing and reproducing a digital TV signal provided by the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram of a digital TV signal output apparatus to which the present invention is applied. Referring to FIG. 1, a digital TV signal output apparatus to which the present invention is applied is a set-top box generally used to receive a DTV or satellite broadcast. (Set-Top Box) 100 and the recording and reproducing apparatus 200 of the present invention capable of selecting and storing or playing a desired signal among TS (Transport Stream) data received through the set-top box 100. It consists of.

In this case, the recording and reproducing apparatus 200 may be configured separately from the set-top box 100 as shown in FIG. 1 or may be embedded in the set-top box 100.

FIG. 2 is a block diagram of the recording and reproducing apparatus 200, that is, the digital TV signal storing and reproducing apparatus according to an embodiment of the present invention. Referring to FIG. 2, the DTV signal storing and reproducing apparatus of the present invention. TS data input / output unit 210, PID comparator 220, time information processing unit 230, FIFO (First Input First Output) 240, HDD 250, FIFO control unit 260, operation signal input unit ( 270 and the CPU 280.

The TS data input / output unit 210 is a device for exchanging information with the set-top box, and inputs a DTV signal that is transmitted with a packet-specific unique number (PID), that is, TS (Transport Stream) data. The control signal input unit 270 inputs the user's external control signal related to the storage and reproduction of the DTV data into the DTV storage and reproducing apparatus.

The HDD 250 stores a DTV signal selected by an external manipulation of a user, and outputs a signal that the user wants to reproduce among the stored DTV signals by external control.

The PID comparator 220 compares PID of each signal to compare whether a signal input or output through the TS data input / output unit 210 matches a signal selected by a user, and a signal whose result is identical. Select only to print.

The time information processing unit 230 is a device for processing time information according to the standard of the digital TV signal, when the data received from the TS data input / output unit 210 to store the data transmission time interval between the packets Generates time information on the packet and includes it in a predetermined position of the packet, and deletes the included time information when the data stored in the HDD 250 is to be output through the TS data input / output unit 210. .

On the other hand, the FIFO 240 is a type of a queue, the DTV signal to be input through the TS data input / output unit 210 and stored in the HDD 250 or the TS data input / output unit 210. The DTV signal read from the HDD 250 to be output through the temporary storage), and the FIFO control unit 260 monitors the state of the FIFO 240 to inform the input / output time of the FIFO 240 Generate a signal.

The CPU 280 controls the operations of the PID comparator 220 and the time information processor 230 according to a user's operation signal input through the operation signal input unit 270, and controls the FIFO controller 260. The operation of the HDD 250 is controlled by the signal.

3 is a block diagram illustrating an operation state of the FIFO 240 according to an embodiment of the present invention, wherein the areas of the FIFO 240 are divided into two areas of the first FIFO 241 and the second FIFO 242. After dividing into, the area is divided into a write or read area by a control signal transmitted from the FIFO control unit 260.

3 illustrates an example in which the first FIFO 241 operates in the write area and the second FIFO 242 operates in the read area, in which data (TS data + N) including time information in the TS packet is external Is applied, the data is stored in the first FIFO 241 and the second FIFO 242 operates as a read area while information is written to the first FIFO 241 to retrieve previously recorded information. It transfers to the HDD 250 side.

On the other hand, the FIFO control unit 260 monitors the state of the first FIFO 241, when a certain amount of information is stored in the first FIFO 241, the first and second FIFO (241, 242) Switch the operation status of That is, the first FIFO 241 controls to operate in the write state, and the second FIFO 242 controls to operate in the read state.

4 is a timing diagram illustrating general TS packet data and a TS valid signal, and illustrates TS packet data and a TS valid signal input through the TS data input / output unit 210. FIG. 4A illustrates a data format of TS packet data. 4B illustrates a TS valid signal input together with the TS packet data to indicate an effective area of the TS packet data.

Referring to FIG. 4A, the general TS packet data is composed of 188 bytes, of which the upper three bytes serve as PID identifiers. The first one byte is an identifier indicating that the TS packet is a TS packet. Has the value '0100 0111'. A 13-bit packet identifier (PID) is stored in the two-byte (16-bit) region connected after the TS packet region. Accordingly, the PID comparator 220 may extract the packet unique number (PID) by the value stored in the upper 3 bytes of the TS data input from the outside.

That is, the packet identification number of the signal input through the TS data input / output unit 210 or the buffering means is identified in the above manner, and the user identifies the packet identification number and the operation signal input unit 270 through the operation signal input unit 270. Compares the packet identification number of the selected image and outputs only the digital image matching the packet identification number to the outside.

On the other hand, the above 188 bytes of TS packet data are delivered at a predetermined time interval, which is a value specified in the DTV signal transmission standard, and is applied to a TS valid signal input simultaneously with the packet data (see FIG. 4B). The effective section is set by this. That is, TS packet data is valid in a section in which the TS valid signal is 'high'.

In the case of DTV signals currently used in Korea, the effective area is 72 ms, the time gap between these valid regions is 4 ms, and a period for transmitting one packet is generally 76 ms.

That is, in the case of the DTV signal, it must have a constant transmission time interval as described above in order to be transmitted over the air in accordance with the standard, but generally used storage means (eg HDD) does not include this interval, and stores only necessary data It is supposed to.

Accordingly, in order to overcome the difference, the time information processor 230 may store the DTV signal received through the TS data input / output unit 210, and transmit time between packets according to the standard of the DTV signal. After counting the intervals to generate the time information as an n-byte signal, the n-byte signal is inserted into a portion of the received packet data and stored in the HDD 250.

On the other hand, when the packet data stored in the HDD 250 is to be reproduced, the packet data including n-byte time information is received from the FIFO 240, the time information is deleted, and the packet data is entered into the TS data. Output through the output unit 210, but at a time interval included in the time information.

FIG. 5 is a diagram illustrating a data format of TS packet data reconstructed by adding n-byte time information to the received packet data. Referring to FIG. 5, the data format of reconstructed TS packet data is in units of 188 bytes. By adding n bytes of data including time information at the beginning of the packet, the unit packet is reconstructed as packet data of (188 + N) bytes.

Referring to Fig. 5, a three byte signal for identifying the packet is concatenated after n bytes including the time information. That is, information from the N th data to the N + 2 th data becomes information including packet identification information.

Therefore, in order to identify the PID of any data among the packet data stored in the HDD 250 in the PID comparator 220, the packet identification information starts with a value of '47h (0100 0111)'. The region including the information is first extracted, and then the PID is extracted by reading the value of the portion corresponding to two bytes after the identification information.

The data corresponding to n bytes before the packet identification information area is time information indicating a transmission time interval between packets, and after reading the transmission time interval by the value, the transmission time interval of the packet data output to the outside is determined. Adjust it.

On the other hand, the CPU 280 classifies the signals into a certain group by the unique number of the packet data, and regularly divides the storage area of the HDD 250, and then assigns the signals of the group to the divided storage areas. Control to save.

That is, after classifying the packet data into a predetermined group according to the type of the received DTV signal, the packet data included in the same group is stored in the same storage area, thereby facilitating retrieval of packet data to be reproduced later.

FIG. 6 is a flowchart illustrating a method for storing and reproducing a digital TV signal according to an embodiment of the present invention. Referring to FIG. 6, the method for storing and reproducing a DTV signal according to the present invention may be performed by an external command. In operation S610, the type of the command is determined (S620). If the user selects the recording function according to the type of the command, the recording routine is performed (s700). If the user selects the playback function, the playback routine is performed (s800).

At this time, the recording routine s700 identifies a signal to be stored by the packet-specific number of the digital TV signal when the user selects storage of a desired signal by an external operation, and transmits the packet between the digital TV signals. A process of adding time information about a time interval to the packet is performed, and the reproducing routine s800 performs a process of reconstructing packet data stored with the time information when the user selects reproduction of a desired signal by an external operation. After extracting the unique number to identify the corresponding signal, and delays by the transmission time interval between packets included in the time information, and performs a series of processes to delete and output the time information.

The recording routine s700 and the reproduction routine s800 will be described below with reference to FIGS. 7 and 8.

FIG. 7 is a flowchart illustrating a method for storing a digital TV signal according to an embodiment of the present invention. Referring to FIG. 7, when a user selects a recording function by an external operation, the user inputs externally transmitted TS data ( S701), the PID of the input TS data is identified, and it is checked whether the PID matches the PID of the DTV signal to be recorded by the user (s702).

As a result of the checking (s702), the user selects TS data whose PID matches the PID of the DTV signal to be recorded from among the received TS data. Then, time information on the transmission time interval between the TS packets is generated, and the time information is inserted into a predetermined region of the selected TS data (s703).

If time information is inserted into the TS data as described above, the packet data into which the time information is inserted is stored in the FIFO (s704).

If the FIFO is not full, the series of steps s701 to s705 are repeated until the FIFO is full, and if the FIFO is full, the data of the FIFO is HDD. In step S706, the packet is classified into a predetermined group based on the packet unique number and stored.

In addition, all the above processes are repeated until the recording is completed (s707).

FIG. 8 is a flowchart illustrating a method of reproducing a digital TV signal according to an embodiment of the present invention. Referring to FIG. 8, when a user selects a playback function by an external operation, the packet is stored in the HDD with the time information. Among the data, data classified into any group by the packet unique number are stored in the FIFO (s801).

After the unit data is fetched from the FIFO (s802), the PID of the packet data is compared with the PID of the DTV selected by the user to select the DTV signal to be reproduced by the user (s803).

When the user selects the desired DTV signal as described above, time information added for each packet to the selected signal is extracted (s804), the time is delayed by the corresponding time, the time information is deleted, and then TS data input / output is performed. The selected DTV signal is output through the output unit (s805).

On the other hand, it is checked whether the FIFO is empty (empty) and whether playback is finished (s806, s807), and if the FIFO is empty before playback is finished, repeating the series of processes (s801 to s805) When the playback is finished (s807), the playback routine ends (s808).

As described above, the present invention provides a set-top box by freely selecting a DTV signal by a PID signal included in the DTV and storing the same in a separate storage device, and reproducing the stored DTV signal at a desired time. ), There is an advantage that the DTV signal received through the indoor receiver such as) can be freely recorded or reproduced through a general TV.

Claims (8)

Input / output means for inputting or outputting a digital TV signal transmitted with a packet-specific number as a packet unit data; Operation signal input means for inputting an external operation signal of a user; Storage means for storing the digital TV signal; Comparison means for comparing whether a signal input or output through the input / output means matches a signal selected by the user through the manipulation signal input means, and selecting and outputting only a signal whose result matches the output signal; Time information processing means for generating time information on the transmission time interval between packets generated according to the standard of said digital TV signal, or deleting said time information; Buffering means for temporarily storing a digital TV signal input through said input / output means and to be stored in said storage means or a digital TV signal read from said storage means for output through said input / output means; Buffering control means for monitoring a state of the buffering means and generating a control signal informing the input / output time of the buffering means; Main control means for controlling the operation of the comparison means and the time information processing means by the operation signal of the user input through the operation signal input means, and the operation of the storage means by the control signal of the buffering control means; Device for storing and reproducing digital TV signal, characterized in that it comprises a. The method of claim 1, wherein the comparison means Identify the packet unique number of the signal input through the input / output means or the buffering means, and compares the packet unique number and the packet unique number of the image selected by the user through the operation signal input means to match the packet unique number And a digital TV signal outputting only a digital image. The method of claim 1, wherein the time information processing means Counting the transmission time interval between packets according to the standard of the digital TV signal, the time information is generated as a signal of n bytes, inserted into a predetermined portion of the packet data input through the input / output unit and transmitted to the buffering means , Receive packet data including n-byte time information from the buffering means, delete the time information, output the packet data through the input / output unit, and output at intervals of time included in the time information. Apparatus for storing and reproducing digital TV signals. The method of claim 1, wherein the buffering means Consisting of two divided first and second storage areas, Under the control of the buffering control means, when the first storage area is in a write state, the second storage area is in a read state, and when the first storage area is in a read state, the second storage area is in a write state. A device for storing and reproducing digital TV signals. The method of claim 1, wherein the control means The signals are classified into a predetermined group by the unique number of the packet data, and the storage area of the storage means is regularly divided, and the digital TV is controlled to store the signals for each group in the divided storage area. Device for storing and reproducing signals. In the method of storing or reproducing digital TV signal transmitted with a packet-specific number as a packet unit data, When the user selects the storage of the desired signal by external operation, the signal to be stored is identified by the unique number for each packet of the digital TV signal, and time information about the transmission time interval between packets of the digital TV signal is stored in the packet. Add and save, When the user selects the reproduction of the desired signal by an external operation, the unique number of the packet data stored together with the time information is extracted, the corresponding signal is identified, and the delay is delayed by the interval between packet transmissions included in the time information. And a reproduction process of deleting and outputting time information. The method of claim 6, wherein the storing process A first step of selecting a signal that a user wants to store based on a unique number of each packet among digital TV signals transmitted in a packet unit at regular transmission time intervals; A second step of generating time information on the inter-packet transmission time interval in the signal selected in the first step and inserting the time information into a predetermined region of the packet data; And a third step of classifying and storing the packet data into which the time information is inserted into a predetermined group by the packet unique number. The method of claim 6, wherein the regeneration process A first step of selecting a signal to be reproduced by a user by extracting a packet unique number of the packet data stored with the time information; Extracting time information added for each packet to the selected signal; After a delay by the extracted time, And a third step of deleting and outputting the time information.