Television – Nonpictorial data packet in television format – Data separation or detection
Reexamination Certificate
1999-12-30
2002-10-29
Miller, John (Department: 2614)
Television
Nonpictorial data packet in television format
Data separation or detection
C348S558000, C348S563000, C348S569000, C348S901000, C725S050000, C725S054000, C725S056000
Reexamination Certificate
active
06473129
ABSTRACT:
BACKGROUND OF THE INTENTION
1. Field of the Invention
The present invention relates to a TV, and more particularly, to a method for parsing an Event Information Table(hereinafter, referred to as ‘EIT’) and a TV using the same method.
2. Discussion of Related Art
A general digital TV receiver, as shown in
FIG. 1
, includes: a tuner
10
to which a broadcasting signal is received; an A/D converter
11
for converting the received broadcasting signal from the tuner
10
into a digital broadcasting data; a channel decoder
12
for detecting a pilot signal from the digital broadcasting data to detect a baseband signal and for performing an error correction for the detected signal; a microcomputer
20
for outputting a control signal in accordance with manipulation of a user; a TP analyzer
13
for analyzing a TP signal in the digital broadcasting signal outputted from the A/D converter
11
to detect audio/video signals under control of the microcomputer
20
; an MPEG audio decoder
24
for decoding the audio signal analyzed in the TP analyzer
13
; an MPEG video decoder
25
for decoding the video signal analyzed in the TP analyzer
13
; a digital to analog converter(DAC)
30
for converting the digital audio signal decoded in the MPEG audio decoder
24
into an analog signal; a flash ROM
40
where channels and programs are stored; a RAM
41
where a temporary data is stored by the operation of the microcomputer
20
; and an NTSC encoder
31
for converting the video signal decoded in the MPEG video decoder
25
into an image signal which is displayed on a TV or monitor. Further, an SDRAM
23
is necessary for data processing in the MPEG audio decoder
24
and the MPEG video decoder
25
, and a user interface
21
and a CAS interface
22
are necessary for generation from the outside of an operation signal for the microcomputer
20
.
Generally, the digital broadcasting processes the video signal and the audio signal under the standard of MPEG. Particularly, the MPEG standard number for the broadcasting system is ISO/IEC 13818-1, that for the video signal is ISO/IEC 13818-2, and that for the audio signal is ISO/IEC 13818-3. However, the digital TV receiver in U.S.A. does not use the audio signal under the MPEG system and processes it under the standard of DOLBY AC-3.
The tuner
10
receives a Quadrature Phase Shift Keying(QPSK) signal or a Quadrature Amplitude Modulation(QAM) signal from an antenna and detects and outputs the received signal. The detected signal in the tuner
10
is converted into an intermediate frequency band signal by means of an IF converter(not shown). This is because the detected signal in the tuner
10
is a high frequency signal in a great high frequency band, with which a driving circuit in the digital TV does not deal.
The channel decoder
12
detects the pilot signal in the intermediate frequency signal to detect the baseband signal and converts the baseband signal into a digital signal. Next, it performs a timing recovery appropriate to a symbol rate and then performs the error correction. The output signal of the channel decoder
12
is a transport stream packet type of signal sequence in a byte unit.
FIG. 2
shows an exemplary view of a transport stream packet structure.
The transport signal sequence, which is standardized in the MPEG-
2
system, is a time-multiplexed signal sequence, which is called “transport stream packet”. The transport signal sequence contains a header on which a packet identifier(PID) number is recorded, on the starting of the packet. The PID number is utilized as the information with which the time-multiplexed signal is demultiplexed. Also, the PID number means the type of a current packet, and if the PID number is analyzed, it is checked whether the current packet is a video packet, an audio packet, or program specific information. Particularly, the digital TV standard in U.S.A. includes the program specific information, that is, a program and system information protocol(hereinafter, referred to as ‘PSIP’).
The PSIP is comprised of: a master guide table(MGT) where the versions of all broadcasting program tables are controlled; a terrestrial virtual channel table(TVCT) where the information for channels is stored; a rating region table(RRT) where a rating table of each program is listed; an event information table(EIT) for providing the information on the current broadcasting programs and future broadcasting programs; an extended text table(ETT) for providing the detailed information on the current broadcasting programs and future broadcasting programs; and a system time table(STT) for sending a current time.
The video and audio standard in the MPEG-
2
system are in connection with the signal sequences of the compressed video and audio. Under the MPEG-
2
standard, the video signal, the audio signal and the program specific information are all time-multiplexed and transmitted in several transport stream packets. And, the signal sequences thereof are all discriminated with the PID number.
The TP analyzer
13
analyzes the signal sequence in the transport stream packet with the PID number and applies the analyzed results to each decoders
24
and
25
. In more detail, the TP analyzer
13
receives the transport signal sequence received in the tuner
10
and senses the PID number contained on the header of the corresponding signal sequence. Thus, the TP analyzer
13
performs demultiplexing through which the received transport signal sequence is divided into a video signal sequence, an audio signal sequence and a program specific information sequence in accordance with the sensed PID number. Thereby, the TP analyzer
13
applies the video signal sequence to the MPEG video decoder
25
, the audio signal sequence to the MPEG audio decoder
24
, and the program specific information sequence to the microcomputer
20
.
The MPEG video decoder
25
decodes the video signal sequence applied from the TP analyzer
13
and outputs the decoded result to the NTSC encoder
31
. The video signal sequence applied from the TP analyzer
13
is the compressed data in the MPEG-
2
system. Therefore, the MPEG video decoder
25
uncompresses the video signal sequence to return to an original digital video data.
The MPEG audio decoder
24
decodes the audio signal sequence applied from the TP analyzer
13
and outputs the decoded result to the DAC
30
. The audio signal sequence applied from the TP analyzer
13
is the compressed data in the MPEG-
1
system. Therefore, the MPEG audio decoder
24
uncompresses the audio signal sequence to return to an original digital audio data.
The DAC
30
converts the digital audio signal applied from the MPEG audio decoder
24
into analog audio signals(R and L) which are processed in an amplifier or speaker. The analog audio signal is outputted as voice or sound by means of a stereo speaker(not shown)
The NTSC encoder
31
converts the digital video signal applied from the MPEG video decoder
25
into luminance and chrominance signals(Y and C) which are displayed on a general TV or monitor. The luminance and chrominance signals are displayed as video by means of a CRT(not shown).
The microcomputer
20
controls the operation of the digital TV receiver. The flash ROM
40
stores the program necessary for the control of the microcomputer
20
, and the DRAM
41
stores the temporary information or data necessary upon the execution of the control operation of the microcomputer
20
.
The digital TV under the above construction receives the program specific information signal sequence to provide various kinds of program specific information which is not obtained in an analog TV to a viewer. Particularly, the EIT is a very important information table containing various kinds of information such as starting time and broadcasting hour, title and grade, caption and the like in connection with programs currently broadcast and programs scheduled in the future. An example where such the EIT is embodied in the digital TV is shown in FIG.
2
.
The EIT as shown in
FIG. 2
is a kind of broadcasting program guide and is compri
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Miller John
Natnael Paulos M.
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