Television – Basic receiver with additional function – Multimode
Reexamination Certificate
1999-04-08
2001-09-04
Hsia, Sherrie (Department: 2614)
Television
Basic receiver with additional function
Multimode
C348S554000, C348S565000
Reexamination Certificate
active
06285408
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a digital Audio/Video (A/V) system, and more particularly to a digital A/V system and method which can support digital systems including digital TV (DTV), digital VCR (DVCR), and digital versatile disk (DVD) player.
2. Background of the Invention
An A/V system is generally an integration of appliances such as TV, VCR and audio system for the purpose of storing and reproducing a variety of media. Currently, the A/V system primarily supports analog forms of video and audio. Accordingly, the A/V system interchanges an NTSC video signal and a digital-to-analog converted audio signal in the appropriate input/output format to support the operation of appliances.
However, with the rapid development of digital multimedia, the image resolution and the number of music channels increased significantly without affecting the functions of the TV, VCR and audio system. Thus, watching an image and listening to voice or music have been greatly enhanced by the development of the digital multimedia. Consequently, the methods for providing and implementing the images and audio for viewing and listening have also changed.
FIG. 1
is a block diagram of a High Definition TV (HDTV) receiver system in the related art;
FIG. 2
is a block diagram of a DVCR system in the related art; and
FIG. 3
is a block diagram of a DVD player system in the related art. Generally, in every system shown in the figures, the A/V signals are converted from analog to digital signals before processing in the respective systems and compression/expansion techniques are utilized for efficient storage and transmission of substantial amount of digital data. The HDTV receiver, DVCR and DVD player systems will next be described.
Referring to the HDTV in
FIG. 1
, a TV signal selected by a tuner
11
is forwarded to a Vestigial Sideband (VSB) demodulator
12
. Because the TV signal is VSB modulated before transmission, the VSB demodulator
12
demodulates the TV signal to provide a transport stream of a program desired by a user. The transport stream obtained at the VSB demodulator
12
is separated into an audio stream and a video stream through a Transport TS demux (transport demultiplexer)
13
, and decoded through an audio decoder
16
and a HD-video decoder
14
respectively. Upon completion of the decoding, the video stream is displayed on an HD monitor
17
through a Video Display Processor (VDP)
15
and the audio stream is played through a speaker
18
.
Referring to the DVCR in
FIG. 2
, a VSB modulated signal is received through a tuner
21
, is converted into a transport stream through a VSB demodulator
22
and is forwarded to a Transport TS demux
23
. The obtained transport streams is recorded on a tape through a tape recording/reproducing unit
29
through the Transport TS demux
23
. However, if a user wants to display the received signals while recording, the signals obtained at the Transport TS demux
23
are separated into a video and audio streams as in the HDTV, and output to a HD-video decoder
24
and an audio decoder
26
for display on a HD monitor
27
through a VDP
25
and speaker
28
. To reproduce the signal recorded on the tape, the transport stream is read out from the tape at the tape recording/reproducing unit, separated at the Transport TS demux
23
into the audio and video streams, and output to the respective decoders
24
and
26
, thereby facilitating the reproduction of the tape.
Referring to
FIG. 3
, a DVD disc is read using a DVD ROM
31
, and a program stream read from the DVD ROM
31
is separated into a video stream, an audio stream and a sub picture at a Transport Program Stream (Transport PS) demux
32
. The video stream and the sub picture are decoded by a SD-video decoder
33
, and displayed on an SD monitor
36
through a VDP
34
. Also, the audio stream is decoded through an audio decoder
35
and played through a speaker
37
.
Unlike an analog system, the digital A/V system utilizes digital forms of input/output data streams defined by set standards. Namely, the input data form for the DTV and DVCR is the transport streams while the input data form for the DVD player is the program stream, as defined by the Motion Picture Expert Group (MPEG) standards (ISO/IEC 13818-1). The data streams are appropriately error correction coded and modulated for transmission and storage according to the transmission paths and storage media. Thus, the streams can be obtained by demodulating and error correction decoding at the respective system. Moreover, each stream contains the compressed video and audio streams as well as additional information such as a timing information for matching A/V synchronization.
Although an analog system utilizes an NTSC composite video signal and two channels of digitized audio signals as input/output signals, the approach to an implementation of the digital A/V system would necessarily differ from the analog system because the digital system utilizes input/output streams defined by standards set by MPEG.
FIG. 4
shows an A/V system in the related art which integrates the aforementioned digital systems of
FIGS. 1-3
, for facilitating the interchange of the aforementioned data streams. The integration shown in
FIG. 4
is a simple combination of the digital systems with only a monitor and a speaker in common, using a set interface standard (IEEE 1394). The IEEE 1394 standard is for an effective connection of various domestic appliances, which also allows an interface of general digital A/V.
The IEEE 1394 standard works well for connecting various appliances. However, the combination according to the standard is complicated for interfacing digital A/V appliances, requiring many hardware. Moreover, the cost for implementing even the simple combination of
FIG. 4
for interfacing the digital A/V appliances is substantially high.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to solve at least the problems and disadvantages of the related art.
An object of the present invention is to optimize the integration of a digital A/V system.
Another object of the present invention is to provide a simplified method for integrating a digital A/V system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and advantages of the invention may be realized and attained as particularly pointed out in the appended claims.
To achieve the objects and in accordance with the purposes of the invention, as embodied and broadly described herein, the digital audio/video system includes a signal reception unit receiving signals; a processing unit processing the received signals and/or reading signals stored in a storage media; a transport demux processing the signals to standardize each received signal, to selectively decode the signals desired by a user, and to output a video stream and audio stream separately; a decoding unit decoding the video stream and the audio stream from the transport demux; an image display unit receiving and processing the signal processed by the decoding unit to display the signal according to a function requested by the user; an audio unit playing sound; a control signal application unit executing the function desired by the user; and a control unit detecting the control signals from the control signal application unit to overall control each of the units.
REFERENCES:
patent: 5463619 (1995-10-01), van Steenbrugge et al.
patent: 5973748 (1999-10-01), Horiguchi
patent: 6005640 (1999-12-01), Strolle
IEEE Computer Society, “IEEE Standard for a High Performance Serial Bus”, http://www.1394ta.org/Technology/Specifications.
Choi Seung-Jong
Kim Jin-Kyeong
Lyu Hwa-Young
Hsia Sherrie
LG Electronics Inc.
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