MXPA98006727A - Digi video reception device - Google Patents

Abstract

The present invention provides a digital video reception apparatus for presenting a plurality of digital TV images on a plurality of reception terminal apparatuses. The digital video reception apparatus includes a tuner (103) for extracting the received digital TV multiplexed signal, a demodulator (104) for decoding the digital signals coming from the synthesizer, a demultiplexer (105) for multiplexing multiplexed signals that output of the demodulator to obtain a bitstream including a video signal, an audio signal and a data signal. The digital video reception apparatus further includes a video decoder (106), an audio decoder (107) and a data decoder (108) for decoding signals output from the demultiplexer. The digital video reception apparatus decodes the multiplexed digital TV signal of input and output to a video signal, an audio signal and a data signal corresponding to respective programs.

Description

DIG ITAL VIDEO RECEPTION DEVICE Field of the Invention The present invention relates to a digital video reception apparatus for receiving a digital video signal in relation to a digital TV device, digital CATV and digital broadcasting device.

Description of the Invention Figure 14 shows a multimedia information processing apparatus described in "an encoder-decoder having broadcast quality for satellite communication", Hattori, Tanaka, Asano, Asai and Sakadi, Mitsubishi Denki Technical Gazette, Vol 67, No. 7, p. 33-38 (1993). A conventional digital video reception apparatus can be explained using Figure 13 and Figure 14. Figure 13 shows an example of a signal frequency presentation on a satellite repeater having a two wave transmission mode. In Figure 13, a high image quality mode represents a way to transmit two waves in a repeater and a higher quality video and audio. The SNG multiple mode ("Satellite News Gathering") represents a mode to simultaneously transmit or multiplex two programs of SNG mode, which can transmit four waves at most via a repeater of a communication satellite, "Super Bird" (Super Bird), and to transmit two video programs via a wave. In Figure 13, the two waves are transmitted simultaneously and each wave simultaneously transmits two programs. When the two waves shown in Figure 13 are demultiplexed and received simultaneously, four digital program video reception devices 400 (two apparatuses x two apparatuses) (shown in Figure 14), are necessary. In high-quality image mode, a wave carries a program, but in the SNG multiple mode, two programs are carried on a wave as shown in Figure 14. The SNG multi-mode decoding operation is more ahead. In Figure 14, a reducing converter 402 selects any of the SNG multiplexed waves 51 1 or 512 in Figure 13 from a received I F (Intermediate Frequency) signal 401. The QPSK 403 demodulator digitally demodulates the wave selects. A Viterbi 404 decoder corrects errors and a 2CH demultiplexer 410 demultiplexes a wave signal in two programs. One of the program signals is corrected through a de-interleaver portion 411, a cable solomonic decoder 412 and a decoding portion 413 and output to a demultiplexer 430. The other program signal is demultiplexed through the demultiplexer 2CH 410 in a digital video output 422, which is input to the demultiplexer 2CH 410 of the other digital program video reception apparatus 400 as a digital video output 421. The output signal of the demultiplexer 2CH 410 of the other video reception apparatus program digital 400 is also corrected through circuits 411, 412 and 413 and output to demultiplexer 430 in the same manner as described above. Conventionally, a multiplexed SNG wave includes two programs. The respective multiplexed SNG wave is demultiplexed in a program through the demultiplexer 2CH 410 and output to the demultiplexer 430. A video decoder 432 receives a VBI (vertical blank line interval) signal 431 from the demultiplexer 430 and outputs the a video signal 441 to a terminal. An audio decoder 433 decodes an audio encoded signal received from demultiplexer 430 to output as an audio signal 422. Similarly, a command line interface 434 outputs a communication signal 443 and a data interface 435 outputs to a terminal data signal 444. Conventionally, only digitally coded programs can be received. Therefore, an analog video image and a digital video image can not be received by the same receiving terminal apparatus. A conventional digital video reception terminal apparatus can only receive a digital video program, but can not display a digital video image of multiple channels. Also, the conventional digital video reception terminal apparatus can not display different respective digital video images on a plurality of terminals (monitors). A data demultiplexer of the conventional digital video reception terminal apparatus can only demultiplex data accompanied by a program, but can not demultiplex data corresponding to a plurality of digital video programs. For example, when the amount of calculation to decode HDTV (High Definition Television, "High Resolution Television") of a digital television of high image quality is as much as six times that of SDTV (Standard Definition Television, "Resolution Television"). Normal ") of a normal digital television, a data decoder of the conventional digital video receiving terminal apparatus can decode an HDTV image or an SDTV image, but can not decode a plurality of SDTV images, simultaneously, or a plurality of SDTV images plus an H DTV image, simultaneously.

COMPENDIUM OF THE INVENTION It is an object of the present invention to be able to view different programs independently on a plurality of monitors using a digital video reception apparatus. It is another object of the present invention to be able to view a H DTV program as well as a plurality of SDTV programs at the same time on a monitor using a digital video reception apparatus. It is a further object of the present invention to be able to watch digital TV programs sent through a digital signal as well as analog TV programs sent through a digital signal at the same time on a monitor using a digital video reception apparatus. According to one aspect of the invention, a digital video reception apparatus receives digital broadcast programs including a plurality of multiplexed media such as video, audio and data, and provides the programs to the subscribers. The apparatus includes a tuner for receiving a multiplexed signal and converting it to a digital baseband signal and a demodulator for decoding the digital baseband signal provided with the tuner. The apparatus further includes a demultiplexer for selecting one or more programs of the multiplexed programs including a plurality of means such as a video signal, an audio signal and a data signal according to a program selection signal provided from outside, and for demultiplexing respective bitstreams including a video signal, an audio signal or a data signal. The apparatus further includes a video decoder for decoding the demultiplexed video signal by the demultiplexer, an audio decoder for decoding the demultiplexed audio signal by the demultiplexer, and a data decoder for decoding the demultiplexed data signal by the demultiplexer. According to another aspect of the invention, the video decoder in the digital video reception apparatus includes a bitstream splitter and a plurality of video decoding units, each of the video decoding units including a decoder partial video and a memory. The bitstream divider generates video streams including a video signal, an audio signal and a data signal for each channel, using a clock and a current identification signal. Each video decoding unit decodes the respective video stream for each channel using the partial video decoder and the memory, and outputs the decoded signal as a video output signal. According to a further aspect of the invention, the digital video reception apparatus further includes a channel demultiplexer for generating a video current, a clock signal and a current identification signal for each channel, using a stream of bits including a video signal, an audio signal and a data signal, a clock signal and a current identification signal each of which is output from the demultiplexer. The video decoder, the audio decoder and the data decoder process the respective signals for each channel, decode and output the video signal, the audio signal and the data signal for each program. According to still another aspect of the invention, the video decoder in the digital video reception apparatus includes a plurality of video decoder units, each of the decoder units including a partial video decoder and a memory. Each video decoder unit decodes the bitstream including a video signal, an audio signal and a data signal taken from the channel demultiplexer, using a clock signal and a current identification signal, and outputs a signal decoded as a video output signal. According to another additional aspect of the invention, a digital video receiving apparatus receives digital broadcasting programs including a multiplicity of multiplexed media such as video, audio and data, and provides the program to the subscribers. The digital video reception apparatus includes a tuner for receiving a multiplexed signal and converting it to a digital baseband signal and a demodulator for decoding the digital baseband signal provided with the tuner. The digital video reception apparatus further includes a demultiplexer for demultiplexing and outputting a bit stream including a video signal, an audio signal and a data signal, a clock signal and a current identification signal for each channel according to a selection signal, when a multiplexed signal is SDTV, and to demultiplex and output a bit stream including a video signal, an audio signal and a data signal, a clock signal and an identification signal of current for each partial image according to a selection signal, when the multiplexed signal is H DTV. The digital video reception apparatus further includes a video decoder for decoding the demultiplexed video signal by the demultiplexer, an audio decoder for decoding the demultiplexed audio signal by the demultiplexer, a data decoder for decoding the demultiplexed data signal. by the demultiplexer, a presentation synthesizer for synthesizing a plurality of the signals output from the video decoder and generating a video signal for presentation on a monitor, an audio selector for selecting one of the audio signals output from the audio decoder, and a data selector for selecting one of the data signals coming out of the data decoder. According to a further aspect of the invention, the video decoder in the digital video reception apparatus includes a bitstream splitter and a plurality of video decoder units, each of the video decoder units including a video decoder. partial video and a memory. The bitstream divider generates video streams for each channel from the video signal output from the demultiplexer, according to the switching signal and each of the video decoder units decodes the video stream for each channel to output a video signal, when the multiplexed signal is SDTV. The bitstream divider also generates video streams for each partial image of the video signal output from the demultiplexer, in accordance with the switching signal and each of the video decoder units decodes the video stream for each partial image to output a video signal, when the multiplexed signal is H DTV. According to another aspect of the invention, the display synthesizer in the digital video reception apparatus includes a plurality of enlarger / reducer units and a display unit. The presentation synthesizer expands or reduces the sizes of the decoded and introduced signals of the video decoder, superimposes a plurality of the enlarged or reduced video signals and generates a video signal to be displayed on a monitor in the case of SDTV. According to a further aspect of the invention, the digital video reception apparatus further includes an NTSC / PAL decoder. The tuner spreads a received multiplexed signal towards an analog baseband signal and a digital baseband signal. The NTSC / PAL decoder decodes the analog baseband signal provided from the tuner to generate a decoding video signal. The presentation synthesizer synthesizes the analog video signal of the NTSC / PAL decoder and the digital video signal of the video decoding., and generates a video signal to present the analog video signal and the digital video signal in a monitor. According to yet another aspect of the invention, the presentation synthesizer in the digital video reception apparatus includes a screen regenerator and a screen display unit. When no analog TV signal is input from the NTSC / PAL decoder, the presentation synthesizer synthesizes the digital HDTV video signal received from the video decoder to generate a video signal for display on a monitor. When the analog TV signal is input from the NTSC / PAL decoder, the display unit superimposes the H DTV video signal and the analog TV signal generates a video signal to be displayed on a monitor.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be more readily understood through the accompanying drawings, which are given by way of illustration only, and are thus not limiting of the present invention, wherein: Figure 1 shows a digital video reception apparatus of a first embodiment of the present invention; Figure 2 shows a video decoder used in the digital video reception apparatus of the first embodiment of the present invention; Figure 3 shows a plurality of monitors connected to the digital video reception apparatus of the first embodiment of the present invention; Figure 4 shows a digital video reception apparatus of a second embodiment of the present invention; Figure 5 shows a video decoder in the digital video reception apparatus of the second embodiment of the present invention; Figure 6 shows a digital video reception apparatus of a third embodiment of the present invention; Figure 7 shows a video decoder used in the digital video reception apparatus of the third embodiment of the present invention; Figure 8 shows a monitor, which presents a plurality of SDTV images of the digital video reception apparatus of the third embodiment of the present invention; Figure 9 shows a monitor, which presents HDTV images of the digital video reception apparatus of the third embodiment of the present invention; Figure 10 shows a digital video reception apparatus of a fourth embodiment of the present invention; Figure 1 1 shows a monitor, which presents an SDTV image and an HDTV image of the digital video reception apparatus of a fourth embodiment of the present invention on a monitor; Figure 12 shows an example of multiplexed signals in the embodiments of the present invention; Figure 13 shows an example of a conventional signal frequency presentation on a satellite repeater; and Figure 14 shows an example of a digital video reception terminal apparatus. The present invention will be more fully understood from the detailed description presented below and the accompanying drawings, which are given by way of illustration only, and are thus not limiting of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES A broader aspect of the applicability of the present invention will be apparent from the following detailed description. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will be apparent to those skilled in the art. the technique from this detailed description.

Modality 1. Using Figures 1 -3, a digital video reception apparatus of a first embodiment of the present invention is explained. Figure 1 shows a schematic diagram of a digital video reception apparatus of the first embodiment of the present invention. The digital video reception apparatus of Figure 1 includes an input terminal 1 1 1, a tuner 1 03, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a received input signal 1049, a multiplexed signal 185, a program selection signal 150, a video stream 153, a clock signal 154, a current identification signal 155, video output signals (156 a , 156b, ... 156n), audio output signals (157a, 157b, ... 157n), and data output signals (160a, 160b, ... 160n). The operation of the digital video reception apparatus of the first embodiment of the present invention is now explained. The received input signal is input to the input terminal 111 and the necessary signal elements thereof are extracted in the tuner 103. After, the extracted signals are demodulated in the demodulator 104 and exit as the multiplexed signal 185 to the demultiplexer 105. The multiplexed signal 185 input to the demultiplexer 105 is a multiplexed signal in which a plurality of programs is coded and multiplexed to a stream. The multiplexed signal 185 includes a bitstream comprised of a plurality of programs as shown in Figure 12. The multiplexed signal 185 in Figure 12 includes n-channel video signals, n-channel audio signals, and channel data signals n. The initiators of each of the video signals, audio signals and data signals include accompanying data such as a clock necessary for each channel. The demultiplexer 105 demultiplexes a video signal, an audio signal and a data signal from the multiplexed signal 185 and extracts only encoded data from a desired program through the program selection signal 150. For example, the signal The demultiplexed video includes a video stream 153, a clock signal 154 corresponding to a program and a current identification signal 155, which is a control signal for extracting programs. These demultiplexed video signals are output to the video decoder 106. The demultiplexed audio signal includes an audio current signal 170, a clock signal 171 corresponding to a program, and a current identification signal 172, which is a control signal to extract a program. These demultiplexed audio signals are output to an audio decoder 107. On the one hand, the demultiplexed data signal includes a demultiplexed data signal 180, a clock signal 181 corresponding to a program, and a current identification signal 182, which is a control signal to extract a program. The demultiplexed data signals are output to the data decoder 108. The video decoder 106 decodes each video stream using the input clock signal 154 corresponding to the program and the current identification signal 155, and output signals from decoded video (156a, 156b ... 156n) for each program as video output signals. The video decoder 106 in the digital video reception apparatus of the first embodiment of the present invention is explained using Figure 2. The video decoder of Figure 2 includes a bitstream divider 201 for dividing the bit streams input for each program, video decoders (202a, 202b ... 202n) for each channel, partial video decoders (203a, 203b ... 203n) to decode video signals for each channel, memories (204a, 20b. .. 204n) for each channel, which are used to decode video signals and video bis streams (250a, 250b ... 250n) for each channel. The video decoder 106 is explained using Figure 2. The video stream 153 that enters the video decoder 106 is divided into bit streams for each channel corresponding to programs using the current identification signal 155. A current of bits 250a of a channel a (CHa) is sent to the video decoding unit 202a, a bit stream 250b of a channel b (CHb) is sent to the video decoding unit 202b, a bitstream 250c of a channel c (CHc) is sent to the video decoding unit 202c, and a bit stream 250n of a n channel (CHn) is sent to the video decoding unit 202n. The video decoders (202a, 202b ... 202n) respectively have a video decoding ability of a conventional SDTV (Normal Resolution Television) class. The video decoders (202a, 202b, ... 202n) respectively decode respective video bitstreams (250a, 250b, ... 250n) divided for each channel, and output as video output signals (156a), 156b, ... 156n) for each channel. The video decoders (202a, 202b, ... 202c) perform the video decoding according to the video clock 154, which is provided as a master clock. The video decoders (202a, 202b, ... 202n) respectively decode video signals using respective internal partial video decoders (203a, 203b, ..203n) and memories (204a, 204b, ... 204n), and give output to respective video output signals (156a, 156b, ... 156n). The audio decoder 107 decodes the input audio current signal 170 and outputs decoded audio signals (157a, 157b, ... 157n) for each program as audio output signals. The data decoder 108 similarly decodes the input data stream 180 and outputs decoded data signals (160a, 160b, ... 160n) for each program as data output signals. Figure 3 shows a plurality of monitors (332a, 332b, ... 332n) connected to the digital video reception apparatus of the first embodiment of the present invention. In Figure 3, video output terminals (330a, 330b, ... 330n) are shown. The video output terminal 330a includes a video output signal 156a, the audio output signal 157a and the data output signal 160a, shown in Figure 1. The video output terminal 330b includes the video output signal 156b, the audio output signal 157b and the data output signal 160b, shown in FIG. 1. The video output terminal 330n includes the output signal 156n video, the audio output signal 157n and the data output signal 160n, shown in Figure 1. In this way, each group of signals from the video decoder 106, the audio decoder 107 and the data decoder 108 leaves each monitor. Each video, audio and data can be played on each monitor. The decoded video signals (15a, 156b, ... 156n) coming out of the video decoder 106, the decoded audio signals (157a, 157b, ... 157n) coming out of the audio decoder 107 and the data signals decoded (160a, 160b, ... 160n) that leave the data decoder 108 leave the digital video reception terminals as independent signals. Accordingly, different images can be presented on different monitors by connecting the different monitors to the corresponding terminals of the digital video reception apparatus.

Modality 2. Using Figure 4, a digital video reception apparatus of a second embodiment of the present invention can be explained. Figure 4 shows a schematic diagram of the digital video reception apparatus of the second embodiment of the present invention. In the second embodiment, a multiplexed video stream is demultiplexed through a demultiplexer and also demultiplexed for each channel through a channel demultiplexer 1 15. The demultiplexed signal for each channel is provided to a video decoder 106. The The digital video reception apparatus of Figure 4 includes an input terminal 1 1 1, a tuner 103, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a channel demultiplexer 1 15, a multiplexed signal 185, demultiplexed channel video streams (153a, 153b, ... 153n), demultiplexed cabal clock signals (154a, 154b, ... 154n), video output signals (156a, 156b, ... 156n), audio streams (170a, 170b, ... 170n), audio output signals (157a, 157b, ... 157n), demultiplexed data signals (180a, 180b, ... 180n), and data output signals (160a, 160b, ... 160n). The operation of the digital video reception apparatus of the second embodiment of the present invention is explained using Figure 4. A multiplexed digital signal is input to an input terminal 1 1 1 of the digital video reception apparatus and the signal elements The signals needed are demodulated in the demodulator 104 and output as a multiplexed signal 185 to the demultiplexer 105. The demultiplexed signal 185 entering the demultiplexer 105 has the same construction as that of the stream of the first embodiment of the present invention. The demultiplexer 105 generates a current identification signal (not shown) for demultiplexing a video stream, a clock signal and a channel of the multiplexed signal 185. The channel demultiplexer 1 generates demultiplexed channel video streams (153a, 153b ... 153n) for each channel and demultiplexed channel clock signals (154a, 154b ... 154n) for each channel using the current identification signal (not shown) generated by the demultiplexer 105. The video decoder 106 it receives the demultiplexed channel video streams (153a, 153b ... 153n) corresponding to the programs and decodes them using the demultiplexed channel clock signals (154a, 154b ... 154n). The video decoder 106 outputs the decoded video signals (156a, 156b ... 56n) as video output signals. The audio decoder 107 receives audio streams (170a, 170b ... 170n) corresponding to the programs and decodes them. The audio decoder 107 outputs decoded audio signals (157a, 157b, ... 157n) for each program as audio output signals. The data decoder 108 similarly receives data streams (180a, 180b, ... 180n) corresponding to the programs and decodes them. The data decoder 108 outputs decoded data signals (160a, 160b, ... 160n) for each program as data output signals.

Each group of output signals from the video decoder 106, the audio decoder 107, and data decoder 108 is output to each monitor. Each video, audio and data can be produced on each monitor in the same manner as shown in the first embodiment of Figure 3. The decoded video signals (156a, 156b, ... 156n) that come out of the video decoder 106 , the decoded audio signals (157a, 157b, ... 157n) leaving the audio decoder 107 and the decoded data signals (160a, 160b, ... 160n) leaving the data decoder 108 exit the terminals of digital video reception as independent signals. Accordingly, different images can be presented on different monitors by connecting the different monitors to the corresponding terminals of the digital video reception apparatus. The video decoder 106 in the digital video reception apparatus of the second embodiment of the present invention is explained using Figure 5. In Figure 5, the input signal to the video decoder 106 is not a multiplexed video signal of channel n, but rather it is a demultiplexed video signal for each channel, which is different from the video decoder 106 of the first mode of the present invention. The video decoder 106 of Figure 5 includes video decoders (202a, 202b, ... 202n), video decoders (203a, 203b, ... 203n) for each channel and memories (204a, 204b, ... 204n), each corresponding to the video decoders (202a, 202b, ... 202n). The video stream 153a, the clock signal 154a and the current identification signal 155a are input to the video decoding unit 202a and decoded therein. Since the operation of the video decoding unit 202a is the same as that of the first mode shown in Figure 3, the detailed description thereof is omitted. Similarly, other video decoders (202a, 202b, ... 202n) also output decoded video signals (156a, 156b, ... 156n), respectively. The different images for each channel can be reproduced by connecting the decoded video signals (156a, 156b, ... 156n) to the respective monitors.Mode 3. Figure 6 is used to explain a digital video reception apparatus of a third embodiment of the present invention. Figure 6 shows a schematic diagram of the digital video reception apparatus of the third embodiment of the present invention. The digital video reception apparatus of Figure 6 includes an input terminal 1 11, a tuner 103, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a presentation synthesizer 109, an audio selector 1 10, a data selector 1 16, a selection signal 148, a video current 153, a clock signal 154, a current identification signal 155, decoded video signals ( 156a, 156b, ... 156n), decoded audio signals (157a, 157b, ... 157n), a video output signal 158, an audio output signal 159, decoded data signals (160a, 160b, ... 160n), a data output signal 161 and a demultiplexed signal 185. The operation of the digital video reception apparatus of the third embodiment of the present invention is explained using Figure 6, A multiplexed digital signal is input to the end of ent 1 1 of the digital video reception apparatus and the desired signal elements thereof are extracted in the tuner 103. The extracted digital signals are demodulated by the demodulator 104 and are input to the demultiplexer 105. In the video reception apparatus In the first and second embodiments of the present invention, only normal SDTV signals are input to the input terminal 1 1 1. On the one hand, in the digital video reception apparatus of the third embodiment of the present invention, a signal HDTV or both SDTV signals and an HDTV signal are input to the input terminal 11 1. In the case of SDTV, the processing of the tuner 103 to the video decoder 106 is similar to that of the digital video reception apparatus described in FIG. first embodiment of the present invention. However, in H DTV, since the bandwidth of the signal is very wide, each video decoder 106 can not decode the entire bandwidth of the HDTV signals at the same time. Therefore, the HDTV signal is divided into a plurality of partial signals corresponding to a plurality of images. The partial video decoders (203a, 203b, ... 203n) in the video decoder 106 decode the respective split-part signals (250a, 250b, ... 250n) and regenerate HDTV by synthesizing the decoded signals (156a, 156b,. ..156n). The partial video decoders (203a, 203b, ... 203n) operate in the same manner as the partial video decoders (203a, 203b, ... 203n) in the first mode. The operation of the video decoder 106 is explained in the case that the SDTV signals and an HDTV signal are input to it using Figure 7. A switching signal 205 switches to split mode according to the bitstream 153 introduced to a bitstream divider 201 is conventional SDTV (Normal Resolution Television) or HDTV (High Resolution Television). The switching signal 205 may be generated within the bitstream divider 201 according to the video stream type 153.

In the case of SDTV: The operation of the video decoder 106 is explained in the case of SDTV signals being input to it. In the bitstream divider 201, the video stream 153, the clock signal 154 and the current identification signal 155 are divided for each channel and sent to respective video decoders (202a, 202b, ... 202n ). The respective video decoders (202a, 202b, ... 202n) output respective decoded video signals (156a, 156b, ... 156n). Since the method for generating the decoded video signals is similar to that of the first mode, the explanation thereof is omitted. i In the case of HDTV: The operation of the video decoder 106 is explained in the case of HDTV being entered in it. The HDTV signal input to the video decoder 106 is divided into each corresponding partial video signal for each partial image based on the video current 153, the clock signal 154 and the current identification signal 155, and the signal of respective divided partial video are sent to the respective video decoders (202a, 202b, ... 202n). The partial video decoders (203a, 203b, ... 203n) in the respective video decoders (202a, 202b, ... 202n) decode each partial video signal. If the data of the adjacent video decoders (202a, 202b, ... 202n) are needed to decode, the respective video decoders (202a, 202b, ... 202n) decode signals using decoder connection lines between video ( 255a, 255b, ... 255n) and memories (204a, 204b, ... 204n), and decoded output signals (156a, 156b, ... 156n). The decoded signals (156a, 156b, ... 156n) exiting the video decoder 106 are input to the presentation synthesizer 109, as shown in Figure 6. The presentation synthesizer 109 synthesizes the video output signals (156a) , 156b, ... 156n) and a plurality of partial images is displayed on a monitor. Examples thereof are shown in Figure 8 and Figure 9.

In the case of a plurality of SDTV signals: Figure 8 shows an example for displaying a plurality of decoded SDTV signals on a monitor. A presentation synthesizer 109 of Figure 8 includes magnifying / reducing units (310a, 310b, ... 310n), and a screen display unit 302. In Figure 8, the respective decoded video signals (156a, 156b, ... 156n) received from the video decoder 106 are input to the magnifying / reducing units (310a, 310b, ... 310n) for each channel. The respective decoded video signals (156a, 156b, ... 156n) are enlarged or reduced to the desired sizes according to a plurality of screen sizes on the monitor 332. Then, the extended or reduced signals are synthesized in the unit. screen display 302 and output to the monitor 332 as a synthesized signal 352. As a result, a plurality of images corresponding to respective channels are presented on a monitor 332. [0046] In the case of an HDTV signal: The Figure 9 shows an example for enlarging / reducing the divided decoded video signals, and synthesizing them to present an HDTV image on a monitor. A presentation synthesizer 109 of Figure 9 includes magnifying / reducing units (310a, 310b, ... 310n), and a screen display unit 302. In Figure 9, the respective decoded video signals (156a, 156b, ... 156n) received from the video decoder 106 are input to the enlarging / reducing units (310a, 310b, ... 310n) for each part. The respective decoded video signals (156a, 156b, ... 156n) are enlarged or reduced to the desired sizes according to screen size positions on the monitor 332. Then, the extended or reduced signals are synthesized in the unit. screen display 302 and output to monitor 332 as a synthesized signal 352. As a result, a combined HDTV image is presented by the respective portions on monitor 332. [0047] Audio decoder 107 in Figure 6 decodes currents of audio 170 including a plurality of audio signals and sends them to audio selector 110. Audio selector 1 10 selects a desired audio signal (in this case HDTV, only 157a is selected) according to a selection signal of audio 17 and outputs the selected audio signal as an audio output signal 159. The data decoder 108 similarly decodes the data stream 180 and sends the signal d screened to a data selector 1 16. The data selector 1 16 selects a desired data signal (in this case of HDTV, only 160 a is selected) according to a data selection signal 1 18 and outputs the signal of data selected as a data output signal 161.

Modality 4. A digital video reception apparatus of a fourth embodiment of the present invention is explained using Figures 10 and 1 1. Figure 10 shows a schematic diagram of the digital video reception apparatus of the fourth embodiment of the present invention , The digital video reception apparatus of Figure 10 includes a tuner 101, a NTSC / PAL 102 decoder, a demodulator 104, a demultiplexer 105, a video decoder 106, an audio decoder 107, a data decoder 108, a presentation synthesizer 109, an audio selector 1 10, a data select 1 16, a selection signal 148, a digital baseband signal 149, a multiplexed signal 185, a baseband signal 151, a signal analog video 152, a video stream 153, a clock signal 154, a current identification signal 155, decoded video signals (156a, 156b, ... 156n), decoded audio signals (156a, 157b, ... 157n), an audio selection signal 117, a data selection signal 118, a video output signal 158, an audio output signal 159, decoded data signals (160a) , 160b, ... 160n), and a data output signal 161. The operation of the digital video receiving apparatus shown in Figure 10 of a fourth embodiment of the present invention is explained. The signals received through a satellite communication or a terrestrial wave communication are streched to an analog baseband signal 151 and a digital baseband signal 149 through the tuner 101. The analog baseband signal 151 is converted to an analog video signal 152 via the NTSC / PAL 102 decoder. The digital baseband video signal 149 is demodulated through the demodulator 104 and the demodulated multiplexed signal 185 is sent to the demultiplexer 105. The multiplexed signal demodulated 185 is a demultiplexed bit stream that includes a plurality of SDTV programs or a bit stream that includes an HDTV program. Figure 12 shows a bit stream comprising a plurality of SDTV programs. Attached data such as clock are included in the initiator of each packet. The demultiplexer 105 receives the multiplexed input signal 185 and demultiplexes a video signal, an audio signal and a data signal. The respective signals are divided into a current signal, a clock signal and a current identification signal in the case of SDTV. For example, as for the video signal, the demultiplexer 105 outputs the video current 153, the clock signal 154, and the current identification signal 155 to the video decoder 106. The clock signal 154 corresponds to a plurality of programs, and the current identification signal 155 is a control signal for selecting a desired program. As for the audio signal, the demultiplexer 105 outputs the audio signal and outputs the audio stream 170, the clock signal 171, and the current identification signal 172 to the audio decoder 107. The signal clock 171 corresponds to a plurality of programs, and current identification signal 172 is a control signal for selecting a desired program. As for the data signal, the same process is carried out. In the case of SDTV, the demultiplexer 105 extracts only necessary programs and outputs video streams 153 based on the selection signal 148 inputted from the outside. In the case of H DTV, the demultiplexer 105 outputs a partial signal current 153, a clock signal 154, and a current identification signal 1 55. The clock signal 154 corresponds to a plurality of programs, and the current identification signal 1 55 is a control signal for selecting a desired partial signal from the multiplexed signal 185. In the case of S DTV, the video decoder 1 06 outputs the decoded video signals (156a), 156b, ... .1 56n) that corresponds to each program. In the case of H DTV, the video decoder 106 outputs the decoded video signals (1 56a, 156b, ... 156n) corresponding to each part. Since the decoding method in the video decoder 106 is the same as that of the third mode, the explanation thereof is omitted. The presentation synthesizer 109 in the fourth embodiment synthesizes a plurality of decoded H DTV partial video signals (156a, 1 56b, ... 156n) which exit from the video decoder 1 06. When the analog video 1 52 leaves the decoder NTSC / PAL 102, the presentation synthesizer 109 synthesizes the analog SDTV and the digital H DTV and outputs the video signal 1 58 for presentation on a monitor. An example of synthesized analog SDTV image and digital HDTV image is shown in Figure 1 1. In Figure 11, the screen regenerator 301 synthesizes the decoded HDTV video signals (156a, 156b, ... 156n) which exit the video decoder 106 and regenerates an HDTV 350 video signal. When one of the HDTV image and the SDTV image is displayed on the image-in-picture system on a monitor, a display unit 302 presents the HDTV signal and the SDTV signal and outputs a video signal 158 to a monitor 332. The monitor 332 can display the analog image and the digital image on a monitor, as shown in Figure 11, in the image-in-picture system. When the multiplexed signal 185 is an SDTV signal, as established in the third embodiment, the screen regenerator 301 synthesizes a plurality of the SDTV video signals. Then, the screen display unit 302 can present a plurality of the SDTV images and an analogous image on a monitor. The invention being thus described, it will be apparent that it can vary in many ways. Said variations are not considered as a departure from the spirit and scope of the invention, and all these modifications, since they may be obvious to one skilled in the art, are intended to be included in the scope of the following claims.

Claims (9)

REVIVAL DICTION EN

1 .- A digital video reception apparatus for receiving digital broadcast programs including a multiplicity of multiplexed media including video, audio and data, and for providing the programs to subscribers, the apparatus comprises: a hoist sinker (103) for receiving a multiplexed signal and converting the multiplexed signal to a digital baseband signal; a demodulator (104) for decoding the digital baseband signal provided with said tuner (103); a demultiplexer (105) for selecting one or more programs from the digital broadcast programs including a plurality of multiplexed means including a video signal, an audio signal and a data signal according to a program selection signal, and for demultiplexing respective bitstreams including a video signal, an audio signal and a data signal; a video decoder (106) for decoding a demultiplexed video signal by the demultiplexer (1 05); an audio decoder (1 07) for decoding an undemixed audio signal by the demultiplexer (1 05); and a data decoder (1 08) for decoding a demultiplexed data signal by said demultiplexer (1 05).

2. The digital video reception apparatus according to claim 1, wherein said video decoder (1 06) includes a bitstream divider (201) and a plurality of video decoder units (202a-202n) , each of the video decoder units (202a-202n) including a partial video decoder (203) and a memory (204), said bitstream divider (201) generates video streams including a video signal, a audio signal and a data signal for each channel, using a clock signal and a current identification, said video decoder unit (202) decodes the respective video stream for each channel using said partial video decoder (203) and said memory (204), and outputs the decoded signal as a video output signal.

3. The digital video reception apparatus according to claim 1, further comprising: a channel demultiplexer (115) for generating a video current, a clock signal, and a current identification signal for each channel , using a bitstream including a video signal, an audio signal and a data signal, a clock signal and a current identification signal, each of which leaves the demultiplexer (105), wherein said decoder of video (106), said audio decoder (107) and said data decoder (108) process the respective signals for each channel, decode and output the video signal, the audio signal and the data signal for each Program.

4. - The digital video reception apparatus according to claim 3, wherein said video decoder (106) includes a plurality of video decoder units (202a-202n), each of said video decoder units including a decoder of partial video (203) and a memory (204), each video decoder unit (202) decodes the bit stream including a video signal, an audio signal and a data signal exiting the channel demultiplexer (1). ), using a clock signal and a current identification signal, and outputs a decoded signal as a video output signal.

5. A digital video reception apparatus for receiving digital broadcast programs including a plurality of multiplexed means including video, audio and data, and for providing the programs to subscribers, the apparatus comprising: a tuner (101) for receiving a multiplexed signal and converting the multiplexed signal to a digital baseband signal; a demodulator (104) for decoding the digital baseband signal provided with said tuner (101); a demultiplexer (105) for demultiplexing and outputting a bitstream including a video signal, an audio signal and a data signal, a clock signal and a current identification signal for each channel according to a signal of selection, when a multiplexed signal is from SDTV, and to demultiplex and output a bit stream including a video signal, an audio signal and a data signal, a clock signal and a current identification signal for each image partial according to a selection signal, when the multiplexed signal is HDTV; a video decoder (106) for decoding the demultiplexed video signal by the demultiplexer (105); an audio decoder (107) for decoding the demultiplexed audio signal by the demultiplexer (105); a data decoder (108) for decoding the demultiplexed data signal by said demultiplexer (105); a presentation synthesizer (109) for synthesizing a plurality of the signals coming out of the video decoder (106) and generating a video signal to be presented on a monitor; an audio selector (1 10) for selecting one of the audio signals output from the audio decoder (107); and a data selector (1 16) for selecting one of the data signals coming out of the data decoder (108).

6. The digital video reception apparatus according to claim 5, wherein said video decoder (106) includes a bitstream splitter (201) and a plurality of video decoder units (202a-202n), each of the video decoder units (202a-202n) including a partial video decoder (203) and a memory (204), said bitstream divider (201) generates video streams for each channel from the signal video output from the demultiplexer (105), according to a switching signal, each of the video decoder units (202a-202n) decodes said video stream for each channel to output a video signal, when the multiplexed signal is from SDTV, and said bitstream divider (201) also generates video streams for each partial image of the video signal output from the demultiplexer (105), in accordance with the switching signal, e each of the video decoding units (202a-202n) decodes said video stream for each partial image to output a video signal, when the multiplexed signal is H DTV.

7. The digital video reception apparatus according to claim 5, wherein said presentation synthesizer includes a plurality of enlarging / reducing units (310a-31 0n) and a screen display unit (302), said presentation synthesizer (109) enlarges or sizes the decoded signals introduced from the video decoder (203), superimposes a plurality of enlarged or reduced video signals and generates a video signal to be displayed on a monitor when A multiplexed signal is from SDTV.

8. The digital video reception apparatus according to claim 5, further comprising: a NTSC / PAL decoder (1 02); wherein said tuner (01) spreads a received multiplexed signal to an analog baseband signal and a digital baseband signal, said NTSC / PAL decoder (102) decodes the analog baseband signal provided with the tuner (101) to generate a decoding video signal, said display synthesizer (109) synthesizes the analog video signal of the NTSC / PAL decoder (1 02) and the digital video signal of the video decoder (203) and generates a video signal to present the analog video signal and the digital video signal to a monitor.

9. The digital video reception apparatus according to claim 8, wherein said display synthesizer (109) includes a screen regenerator (301) and a screen display unit (302), and when not introduced no decoder TV signal NTSC / PA L (102), said presentation synthesizer (1 09) synthesizes the digital HDTV video signal received from the video decoder (203) to generate a video signal to be presented on a monitor, when the analog TV signal is introduced from the NTSC / PAL decoder (102), said screen display unit superimposes the HDTV video signal and the analog TV signal and generates a video signal to be displayed on a monitor. SUMMARY The present invention provides a digital video reception apparatus for presenting a plurality of digital TV images on a plurality of reception terminal apparatuses. The digital video reception apparatus includes a tuner (103) for extracting the received digital TV multiplexed signal, a demodulator (104) for decoding the digital signals coming from the synthesizer, a demultiplexer (105) for demultiplexing the multiplexed signals that output of the demodulator to obtain a bit stream including a video signal, an audio signal and a data signal. The digital video reception apparatus further includes a video decoder (106), an audio decoder (107) and a data decoder (108) for decoding signals output from the demultiplexer. The digital video reception apparatus decodes the input multi-duplex digital TV signal and outputs a video signal, an audio signal and a data signal corresponding to respective programs.