JP2001238180A - Recording and reproducing apparatus of digital data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital TV broadcasting receiver which can add the index information on programs of high operability when the digital data are recorded on a data storage media. SOLUTION: A static image is extracted according to the image decoding result and used as an index image. The index image is processed into the section data and then packetized. Then the packet is superimposed on or replaced with its original stream and recorded on the data storage media.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital television broadcast receiving apparatus.

[0002]

2. Description of the Related Art MPEG (Moving Picture Experts)
Group), etc., in a digital TV broadcast system that encodes and distributes a television signal using a compression encoding method of video and audio signals, in addition to video and audio signals,
It is also possible to transmit system control signals and data signals. A typical application that uses data signals is EPG (Electronic Program Guide).
2. Description of the Related Art A program guide is displayed on a TV monitor screen, and is widely used in multi-channel digital broadcasting to facilitate user's channel selection. EPG display methods include start / end times in text, descriptions of program contents, and graphics data such as icons, but recording of digital broadcast contents is also an essential function for video systems that constitute receivers. It is. For example, Japanese Patent Application Laid-Open No. H11-155122 discloses a method in which a digital compressed signal is decoded into analog video and audio, and then an index is automatically generated when recording on an analog VTR and the video and audio signals are recorded together.

[0003]

In recent years, however, there has been a digital VTR capable of recording a data stream distributed by digital broadcasting as digital data, and it has been difficult to generate and record an index corresponding to the digital VTR. Desired. Furthermore, indices written in letters lack intuition.

[0004]

In order to intuitively grasp the contents of a program, the present invention uses a still image extracted from a video signal as an index so that system data can be recorded on an external recording medium such as a digital VTR. Format.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a digital TV receiver according to an embodiment of the present invention. A packet including a plurality of sets of video and audio multiplexed in the transport stream (TS) format of the MPEG system and system information is input via the stream input interface 1. The stream is input from the data storage medium 11 to the IE
It is also possible through a data storage media interface 5 such as EE1394 to select one of the two inputs with the switch 2 and supply it to the TS demultiplexer (DEMUX) 3. The DEMUX 3 extracts a packet including one set of video and audio and system information according to a program (program) selected by the user, and sends one of the outputs to the subsequent decoder and the other to the data storage media interface 5. The extraction of the packet follows the packet ID (PID) information from the system decoder 9.

FIGS. 5 and 6 show the structure of a TS packet. The TS packet includes a TS header including a PID and a payload. As shown in FIG. 5, when the payload includes elements such as video and audio, the format is a variable-length PES packet format. When the payload includes system information such as control and service information, an error detection code is added by CRC. Section format.

Returning to FIG. 1, packets including video, audio and system information classified by the PID by the switch 4 are respectively transmitted to the video decoder 7, the audio decoder 8 and the Sy.
It is supplied to the stem decoder 9. The video decoder 7 analyzes the video TS packet and supplies a video PES packet. A
The udio decoder 8 analyzes the audio TS packet to obtain an audio PES packet, and further decodes the MPEG Audio ES to obtain an audio output. The system decoder 9 analyzes the system data TS packet to obtain section data, analyzes the contents, and performs processing such as system control or image data construction for OSD (On Screen Display). The OSD image data is superimposed on the video signal from the video decoder 7 by the mixing circuit 10 and becomes the output of the receiving device. FIG. 2 shows an internal block of the index image encoding circuit 6. The video output image input from the video decoder 7 is taken in as an index image by the image editing / compression circuit 601 and the data amount is reduced by trimming and filtering the image size and encoding by a compression method such as JPEG. The data segmenting circuit 602 converts the created index image into a section data format. At this time, the index image is associated with the program using the system information analyzed by the system decoder 9. When the user selects a program and records only one set of video and audio, the index image is extracted from the selected video. On the other hand, when recording the entire stream, the program included in the stream is covered, and the setting is made so that an index image is extracted from those including video. The index image converted into the section data is reorganized into TS packets by the packetizing circuit 603 and sent to the data storage media interface 5.

FIG. 3 shows an internal block diagram of the data storage media interface 5. Index image TS buffer
Reference numeral 504 receives the index image in the form of a TS packet from the index image encoding circuit 6 and temporarily stores the index image. The system information TS generating circuit 505 receives the system information data obtained by the system decoder 9 and reorganizes the data necessary for system control, such as program mapping information, as section data as necessary when recording the data on a data storage medium. And at the same time, make TS packets. Index image TS
TS from the buffer 504 and the system information TS generation circuit 505
The packet output is output by PID replacement circuits 508 and 509, respectively.
Replace IDs as needed. Further, the PID of the video / audio TS packet is also replaced by the PID replacement circuit 501 as necessary. S
The ystem decoder 9 stores the PID in the PID buffer 507,
The data is supplied from the buffer 507 to each replacement circuit. The PID of the TS stream recorded on the data storage medium 11 can be set independently of the one attached at the time of broadcasting.
By replacing PID, for example, P
You can arbitrarily set continuous / discontinuous IDs. Each TS packet in which the PID has been replaced is multiplexed on the time axis by the multiplexing circuit 502 and sent to the data storage medium 11 via the transmission path interface 503.

FIG. 4 shows an example of multiplexing in the multiplexing circuit 502. (a) is a packet including video and audio data input from the Demux 3 via the PID replacement circuit 501. Length
Due to the fixed length of 188 bytes, the arrival timing follows virtual equally-spaced packet slots. If the user selects a program and only records that program,
(a) shows a set of video (V1-4) and audio (A1) and essential system information packets (S1-3) for system control.
Only included. Conversely, when the entire stream is recorded, a set of a plurality of programs is included. (b) is a reorganized system information packet (X1-2), which is supplied from the PID replacement circuit 509. (c) is an index image packet generated by the index image encoding circuit 6. (d)
Indicates the output of the multiplexing circuit 502. Timing control circuit 506
Controls the multiplexing process so that the packets of (b) and (c) are inserted into the empty slot of (a), or an appropriate system packet is replaced with the packet of (b) and (c).

[0010]

As described above, according to the present invention, a still image extracted from a video signal can be converted into a system data section format, and further TS-packeted and inserted into the original video and audio TS. If the stream into which the still image is inserted is recorded on a data storage medium, the contents of the program can be more intuitively provided to the user by referring to the program-related index data during reproduction.

When the user records all packets of a stream on a data storage medium without selecting a specific program, it is effective as means for supporting program selection.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of the present invention.

FIG. 2 is an internal block diagram of an index image encoding circuit.

FIG. 3 is an internal block diagram of a data storage media interface.

FIG. 4 is a timing chart of packet insertion / replacement.

FIG. 5 is a structural diagram of a TS packet (in the case of a PES packet).

FIG. 6 is a structural diagram of a TS packet (for a section).

[Explanation of symbols]

1. Stream input interface, 3. TS demultiplexer, 5. Data storage media interface, 6.
Index image coding circuit, 7 Video decoder, 8 A
udio decoder, 9: System decoder, 11: Data storage media.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keisuke Inada 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Masahiko Kitamori 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Address: Hitachi, Ltd. Digital Media Development Division (72) Inventor: Taku Nakamura 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (Reference) 5C053 FA07 FA14 GB11 GB36 GB37 HA27 HA29 JA03 JA12 LA06 LA14 5D044 AB05 AB07 AB08 BC01 CC03 DE03 DE22 DE49 EF02 EF05 GK08 GK11 HL11 5D045 DA20 9A001 EE04 HH15 HH30

Claims (6)

[Claims] 1. A data stream comprising multiplexed data including compression-encoded video and audio, and a partial stream comprising a set of video data and audio data, and accompanying system data from the data stream. Extracting a still image from the decoded video data and generating an index image, wherein the device extracts the still image from the decoded video data and generates an index image. Means for multiplexing the stream into a stream, means for outputting the multiplexed stream to an external data storage medium, and the content of the video signal of the stream stored in the external data storage medium is indicated by the index image. Digital data reproducing and recording apparatus. 2. The apparatus according to claim 1, wherein the means for multiplexing the index image into the partial stream is such that the index image is multiplexed with the video data and the audio data so as not to temporally overlap. An apparatus for reproducing and recording digital data. 3. The apparatus according to claim 1, wherein the data stream is composed of a plurality of fixed-length packets, and the means for multiplexing the index image into the partial stream includes the index image. Digital data characterized by being inserted into an empty packet slot so that a packet containing the video data and the audio data do not overlap with each other in time, or by replacing a packet containing system information with a packet containing the index image. Playback and recording device. 4. The apparatus according to claim 3, wherein the data stream is composed of a plurality of fixed-length packets, and the means for multiplexing the index image into the partial stream replaces each packet identifier. Digital data reproducing and recording apparatus, characterized in that a unique identifier is given to a packet including the index image. 5. The apparatus according to claim 1, wherein a means for inputting a data stream from an external data storage medium is provided, wherein one of the data stream from the external data storage medium and the received data stream is used. A digital data reproducing / recording apparatus, comprising: a switch for selecting the digital video signal; a means for restoring the index image; and a means for superimposing or switching the restored index image on the decoded video signal. 6. The apparatus according to claim 1, wherein an output data stream to the external data storage medium is partially composed of a plurality of sets of video data and audio data, and associated system data. In the case of a stream, each set is automatically scanned, each set of video data is decoded, still images are respectively extracted, and index images corresponding to a plurality of sets are generated. Digital data reproducing and recording device.