Television – Basic receiver with additional function – Multimode
Reexamination Certificate
1998-03-13
2002-04-30
Lee, Michael (Department: 2614)
Television
Basic receiver with additional function
Multimode
C348S555000, C348S571000
Reexamination Certificate
active
06380983
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to a TV receiver with selectable signal processing systems.
BACKGROUND OF THE INVENTION
In recent years, as the progress of the digital technique, digital technique application products have been widely spread in consumer goods. The TV receiver is not exception to such consumer goods. That is, the digital techniques are used in various picture processing systems dedicated to the TV receiver beginning with a teletext decoder and a high picture quality three-dimensional Y/C separator.
Further, multimedia technique application products based on an MPEG or an Internet architecture are on their way of developing.
FIG. 10
shows a block diagram of a conventional TV receiver having such various functions as described above. While
FIG. 11
shows a display example obtained by such a TV receiver. The configuration of the conventional TV receiver will be described hereinafter in reference to
FIGS. 10 and 11
.
A video signal is input to an input terminal
1001
. The input video signal is decoded in an NTSC video decoder
1002
, so that three of Y, I and Q signals are supplied to a picture size compressor
1011
.
In the NTSC video decoder
1002
, first, a signal is divided into the luminance signal and the chrominance signal in a three-dimensional Y/C separator
1004
. A RAM
1003
is used for causing a three-dimensional frame delay.
A color signal is decoded by a color decoder
1005
, then two chrominance signals I and Q are obtained from the color decoder
1005
.
Further, a separation of horizontal and vertical synchronizing signals are implemented by a synchronous separation circuit (not shown).
And, not shown in
FIG. 10
, the conventional TV receiver further includes fine adjustment control arrangements comprising an ACC, a hue control and a picture quality control etc, which are commonly comprised in ordinary TV receivers.
The decoded NTSC signal is compressed or expanded to a proper picture size in the picture size compressor
1011
. For a full screen picture display the picture size may be compressed or expanded in a nonlinear manner to change compression rates at the center or the sides of the screen.
A RAM
1012
is used for aligning time of signals before and after the compression. For compressing to, e.g., one half, the number of pixels during one horizontal scanning period are reduced to one half, so that the RAM
1012
operates to output two same pixels.
To an input terminal
1006
, a video signal for a second channel is input. The second input video signal is decoded to three of Y, I, Q signals as described above in an NTSC video decoder
1007
.
The decoded signal is then compressed to a proper picture size in a picture size compressor/frame synchronizer
1010
wherein the decoded signal is further phase-synchronized with the video signal on the first channel supplied through the input terminal
1001
.
In more detail, the decoded signal may be written into a RAM
1009
by being synchronized with the second video signal from the input terminal
1006
for a write-in in time. The decoded signal may also be read out from the RAM
1009
by the clock which is phase-synchronized with the video signal on the first channel input through the input terminal
1001
for a read out time.
To an input terminal
1013
, still another video signal is input. The third input video signal is decoded in a teletext decoder
1014
to extracts a teletext data therefrom. An input processor
1015
extracts the teletext data multiplexed on the
10
th horizontal scanning line of the input video signal, and then stores the extracted data in a RAM
1017
. The input processor
1015
often includes an error corrector or a waveform equalizer to improve an anti-ghost performance or an anti-noise performance.
The stored data are decoded using a CPU
1016
, the RAM
1017
and a ROM
1018
, and thus then picture data are formed and stored in the RAM
1017
.
A memory controller
1036
reads out the picture data properly. Accordingly, the RAM
1017
is used not only for temporary data storage but for graphic memory.
The ROM
1018
stores the programs for processing and the data for character display, so-called a character font.
For the teletext receiver, the display data has a non-real time property. Thus the picture size compressor/frame synchronizer
1010
used for NTSC signal processing as described above is not necessary. Signals are usually processed by a software because of its non-real time property.
It is possible to synchronize the display data with the data on the first channel by synchronizing the read out operation of the memory controller
1036
with the synchronizing signal of the data on the first channel.
Here, the input terminal
1013
is described to be independent of the input terminals
1001
and
1006
. However, this video signal is not necessary to be independent of the signals input to the input terminals
1001
and
1006
.
On the other hand, to an input terminal
1019
an MPEG bit stream is input. The digital broadcast has started since 1996 in this country, so that the digital video stream has begun to take the place of the analog signal.
The MPEG can be classified into a MPEG-1 represented as a video DC and a MPEG-2 represented by the digital broadcast as described above. Further, the MPEG-2 bit stream is classified into a TS (transport stream) and a PS (program stream).
Generally, devices capable of decoding the MPEG-2 pictures are capable of decoding the MPEG-1 pictures too.
The TS is basically applied for broadcast uses, while the PS is applied for package media such as a DVD.
Here, it is assumed that the PS is input to the input terminal
1019
. An MPEG decoder
1020
, as same as the teletext receiver, generally tends to process the high-speed processing part such as a CDT (discrete cosine transform) in its dedicated circuit, and to process others in the software such as a CPU.
Accordingly, not shown in the drawings, the MPEG decoder
1020
often includes a CPU. The decoded MPEG signal is implemented the synchronizer or the picture size compression processing in a picture size compressor/frame synchronizer
1038
and a RAM
1039
to establish the synchronization with the first channel as same as the NTSC picture decoder.
An input terminal
1022
is coupled to a telephone line, and thus an Internet terminal unit/graphic engine designated by
1023
is able to access Internets. The signal from the telephone line is converted into the digital signal in a modem
1024
. In the modem
1024
the processing related to the modulation such as a flow control and error correction not only the signal conversion.
The processing after this process is similar to the operation of the teletext decoder
1014
.
The digital signal from the modem
1024
is stored in a RAM
1027
via a CPU
1025
and a memory controller
1026
. Then, according to the processing program stored in an ROM
1028
the digital signal is decoded by the RAM
1027
and the CPU
1025
, so that the picture display data is formed and then stored in the RAM
1027
.
The memory controller
1026
reads out the picture display data property from the RAM
1027
to output the picture. Accordingly, the RAM
1027
is used not only for the temporary data storage for processing but for the graphic memory.
The ROM
1028
stores the program for processing and the character display data, so-called the character font.
The display data has a non-real time property in similar to the teletext data. Thus it is possible to process the most of the display data based on software, and also possible to synchronize with the first channel by aligning the read-out operation of the memory controller
1026
with the synchronizing signal of the data on the first channel.
A timing controller
1033
controls the read out timings of each picture in the picture size compressor
1011
, the picture size compressor/frame synchronizer
1010
, the teletext decoder
1014
, the MPEG decoder
1020
and the Internet terminal apparatus unit/graphic engine
1023
.
A main controller
1029
provides processing instruct
Miyazaki Toru
Yasuki Seijiro
Kabushiki Kaisha Toshiba
Lee Michael
Pillsbury & Winthrop LLP
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