JPH10112724A - Home-use av-lan system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the convenience and the extension performance by building up outgoing and incoming channels between a media terminal and a display section with a coaxial cable or an optical fiber cable or a twisted pair wire. SOLUTION: A media terminal 1 totally manages functions of reception, recording and reproduction of various media information of broadcast/ communication/package, receives command data information from a display section 3 through an incoming channel of a LAN cable 4 and sends the data information through an outgoing channel of the LAN cable 4 accordingly. The LAN cable 4 is built up with a coaxial cable or an optical fiber cable or a twisted pair wire and the data information is sent in the form of time division multiplex serial transmission or the like. An information receptacle 2 extracts corresponding data information among the transmission data information of the outgoing channel and sends request information from the display section 3 through the incoming channel. The display section 3 decodes the received data information to reproduce image and audio data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home LAN (Loc
al Area Network) system, particularly, a home AV device suitable for home information terminals such as AV devices and various information devices.
-For LAN systems.

[0002]

2. Description of the Related Art Conventionally, home television receivers, V
Most AV devices such as CRs and audio devices have an independent configuration. Therefore, complicated connection operations and a large number of cables are required for interconnecting these AV devices.

In the future information society, various information terminal devices will be introduced into homes, and these information terminal devices will be
It is expected that various services will be enjoyed by connecting to V-devices.

For this reason, cableless and single cable
A home AV-LAN system for realizing connection between home AV devices and information terminal devices using a cable has been studied. In this home AV-LAN system, it is particularly important to construct a system with excellent convenience and expandability.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a home AV-LAN system which is excellent in convenience and expandability.

[0006]

A media terminal having a function of integrally managing the reception, recording, and reproduction of various media information of broadcast, communication, and package, a media terminal and a LAN (media terminal). Downlink for transferring data from the terminal to the display unit and media data from the display unit
(It has an upstream line for transferring command data to the terminal)
To construct a home AV-LAN system having a plurality of display units for reproducing images and sounds connected by the system.

[0007] In particular, a LAN realizes a convenient function by being constructed in the following manner.

(1) Both the downlink and the uplink are constructed with a coaxial cable or an optical fiber cable or a twisted pair, and (2) Both the downlink and the uplink are wireless LANs of a wireless cable. (3) The main bus of the downlink and the uplink is constructed with a coaxial cable or an optical fiber cable or a twisted pair line, and the sub-bus is constructed with a wireless cable. The upstream line is constructed with a coaxial cable or an optical fiber cable or a twisted pair line, the downstream sub-bus is constructed with a wireless cable, and (5) the downstream line is constructed with a main bus using a coaxial cable or an optical cable. Fiber cables or twisted pair lines and sub-buses are constructed with wireless cables, and uplinks are constructed with power lines.
(6) The downlink can be constructed with a wireless LAN of a wireless cable, and the uplink can be constructed with a power line.

In data transfer on the downlink, as shown in FIG. 19A, data of a plurality of display units packetized in a predetermined byte unit (P1, P2, …, P
N) is time-division multiplexed, or as shown in FIG. 19 (b), as shown in FIG. Frequency band (D-1, D-2,…, DN in the figure)
), Any one of the transmission forms of the frequency division multiplexing transmission arranged in each of the areas is adopted.

Further, in the technical means of the media terminal, the main signal processing section employs a mechanism of modularization or softwareization, and flexibility is expanded by adding modules or downloading software. Implement the function of

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in the block diagram of FIG. This embodiment is suitable for constructing both the down line and the up line of the LAN with a coaxial cable, an optical fiber cable, or a twisted pair line. In the figure, 1 is a media terminal, 2 is an information outlet, 3 is a display unit, and 4 is a LAN cable.

The media terminal 1 collectively manages the functions of receiving, recording, and reproducing various types of media information of broadcasting, communication, and package, and transmits command data information from the display unit 3 to a LAN cable. Receiving the data on the up line of the cable 4 and transmitting the data information according to the data on the down line of the LAN cable 4;

The LAN cable 4 is constructed of a coaxial cable, an optical fiber cable, or a twisted pair line, and data information is transmitted in the form of time division multiplex serial transmission or frequency division multiplex transmission.

The information outlet 2 is used for transmitting transmission data of a downlink.
The relevant data information is extracted from the data information, and the request information from the display unit is sent out as command data information to the uplink.

The display unit 3 decodes the received data information and reproduces images and sounds. Note that this image display unit is, for example, a PDP, an
A flat display such as is preferred.

Hereinafter, these blocks will be described.

FIG. 2 shows an example of the configuration of the media terminal. IF unit 5 includes terrestrial broadcast waves VS1, BS
/ CS satellite broadcast wave VS2, CATV video signal VS3, image information VS4 transmitted via communication line, surveillance camera video signal V
The input signals of S5 are demodulated, and the digital video signal and the analog video signal demodulated to the base band are output to the digital bus 7 and the analog bus 8, respectively. The package unit 6 reproduces and records a video signal from a VCR, and reproduces a video signal from a DVD, a CD-ROM, or the like.

The decode unit 9 digitizes the video signal and performs a predetermined demodulation process, and outputs the demodulated luminance signal and color difference signals U and V to the YUV bus 10.

The run control unit 11 generates data information to be transmitted on the down line of the LAN cable 4 and decodes command data information received on the up line.

The DVE unit 12 performs frame conversion for converting various frame rate images into fixed frame rate images, and IP for converting interlaced scanning signals into progressive scanning signals. Conversion, SR to convert to image of any size
Performs signal processing such as C (Sampling Rate Convert) conversion.

The memory bank 13 performs signal processing for storing and reproducing necessary image information, and realizes a function of an electronic image freezer.

The system control unit 14 is constituted by a microprocessor or the like, performs processing for controlling the operation of the entire media terminal in response to request information from the display unit, and outputs control signals necessary for the operation of each unit. Supply on control bus 15.

FIG. 3 is a structural example of the IF unit. The terrestrial wave VS1 is demodulated by a tuner 16 into a baseband analog video signal. Note that a plurality of tuners (M in the figure) are used to realize a function of receiving images of different channels on a plurality of display units and simultaneously displaying video signals of a plurality of channels on a guide image or the like. use.

The satellite tuner 17 demodulates an analog broadcast signal of the satellite broadcast wave VS2 into a baseband analog video signal. The satellite digital tuner 18 performs digital demodulation of a digital broadcasting signal and decodes a digital data stream signal. Although not explicitly shown in the drawing, different C
A plurality of tuners are provided so that an H image can be received.

The front end 19 demodulates the CATV video signal VS3 into a baseband video signal of a predetermined channel.

The image information VS4 (for example, various information of FAX, videophone, PC communication, Internet, etc.) transmitted through the communication line is subjected to a predetermined demodulation process by the modem 20, and is converted into a digital image data signal. Is decrypted. The video signal VS5 from the surveillance camera is input to the analog bus 8.

The control bus 15 supplies signals for controlling the operation of each section.

The satellite digital tuner 18, the front end 19 and the modem 20 are constituted by a module board or the like. By adding these module boards, an extended function to diversify the source is realized.

FIG. 4 shows an example of the structure of the package unit. The analog VCR 21 and the digital VCR 22 have a function of recording and reproducing video signals, a DVD 23 and a CD-RO.
M24 realizes a function of reproducing image data. In addition,
The digital VCR 22 can use mutual signals supplied by the digital bus 7 or the analog bus 8 as video signals for recording. The control bus 15 supplies signals for controlling these operations.

The digital VCR 22 and the DVD 23 adopt a configuration in which drive units are modularized. By adding these drive units, an extended function to diversify the package is realized.

FIG. 5 shows an example of a configuration of the decode unit. Among the analog video signals supplied by the analog bus 8, the NTSC video signal is subjected to predetermined AD conversion, YC separation, and color demodulation signal processing in the SD demodulation unit 25, and the luminance signal Y and the color difference signals U, V Is demodulated. In addition, a non-standard SD demodulation unit 26 outputs a reproduced signal of an analog VCR to the
Signal processing such as D conversion, jitter removal, and color demodulation is performed to demodulate the luminance signal Y and the color difference signals U and V. On the other hand, MUSE
The decoder 27 performs demodulation processing of a MUSE signal. Although not explicitly shown in the figure, a plurality of SD demodulation units are provided.

The digital data supplied by the digital bus 7
Of digital broadcasts, digital broadcast signals
The decoder 28 performs a predetermined decoding process to demodulate the luminance signal Y and the color difference signals U and V. The data broadcast signal is subjected to a predetermined decoding process by a data broadcast decoder 29 to demodulate image data such as program information, news, and weather forecasts. Also,
The control bus 15 supplies signals for controlling these operations.

The demodulation unit and the decoder employ a configuration in which all or a part of the signal processing is also performed by a software control processing under program control, and the expandability of the function is realized by downloading the program. .

FIG. 6 is a structural example of the DVE unit. The SRC 30 performs a scaling conversion for changing the size of the image, the frame conversion 31 converts the frame rate,
The IP conversion 32 performs signal processing such as interlaced scanning conversion, and the image synthesis 33 performs signal processing such as PIP or POP image synthesis. The work RAM 34 records and reproduces signals necessary for the signal processing.

The controller 35 controls the operation of each of these units according to a control signal supplied through the
The input / output control of signals supplied by the V bus 10 is performed.

Next, FIG. 7 shows an example of a configuration of a memory bank. The image compression unit 36 performs high-efficiency encoding (for example, JPEG and MPEG encoding) on the signal supplied through the YUV bus 10, and compresses the information amount from a fraction to several tens.

The memory section 37 includes a plurality of types of storage media having different forms, that is, a DVD-SRAM 38 and an HDD 39.
And a semiconductor memory 40. Then, the signal is stored in an optimum medium according to the intended use. For example, information on a broadcast program for one day is stored in a DVD-SRAM 38, and information with a low access frequency (cooking recipe, electronic mail, etc.) is stored in an HDD
The information of the hard disk 39, the replay function and the time shift function is stored in the semiconductor memory 40.

The image decompression unit 41 performs a decoding process on the reproduced signal from the memory unit 37, and outputs the decoded signal to the YUV bus 10.

The control section 42 controls the operation of each section according to the control signal supplied through the control bus 15.

FIG. 8 shows a first configuration example of the run control unit, which is suitable for time-division multiplex serial transmission of high-bit-rate data information on the down line of the LAN. As shown in FIG. 19A, the packetizing units 43-1 to 43-N convert the signals supplied from the YUV bus 10 into the display units 1 to N.
Is extracted and a packet in a predetermined byte unit is generated. Then, a predetermined header code (synchronous code)
(Data SYNC, display code ID, image sequence code VIF) to form one packet. This operation is controlled by a control signal supplied through the control bus 15.

The time division multiplexing unit 44 multiplexes these packets by STM (Synchronous Transfer Mode),
It forms a bit stream signal of data information.

The line I / O unit 45 is provided with the bit stream
A LAN signal is sent to the lower line of the LAN cable 4. Also, it performs processing for receiving and decoding command data information sent on the uplink, and decodes the request information RQ. This information is supplied to the system control unit 14 in FIG.

Note that time division multiplexing is performed by using an ATM (Asynchronous
s Transfer Mode). Further, in packetization, in some cases, adoption of a measure against a code error in LAN transmission (addition of an error detection code or an error correction code) can be considered.

FIG. 9 shows a second example of the configuration of the run control unit, which is suitable for time-division multiplex serial transmission of low bit rate data information on the down line of the LAN. Before the packetizer 43, the compression units 46-1 to 46-
The point that N is provided is different from the first configuration example of FIG. The compression unit 46 extracts information corresponding to the display units 1 to N from the signal supplied through the YUV bus 10, performs high-efficiency encoding processing, and generates data in which the amount of information is compressed. The packetizing unit 43 generates a packet in a predetermined byte unit for the compressed data.

FIG. 10 shows a third example of the configuration of the run control unit, which is suitable for transmitting high bit rate data information in the form of frequency division multiplex transmission on the down line of the LAN.

The digital modulators 47-1 to 47 -N have Y
The information corresponding to the display units 1 to N is extracted from the signal supplied by the UV bus 10 and is subjected to predetermined digital modulation (for example, 64
QAM, etc.). This operation is controlled by a control signal supplied through the control bus 15.

The RF modulating sections 48-1 to 48-N correspond to FIG.
As shown in (b), the signal of the display unit 1 is a signal in the frequency band of f1 to f2, and the signal of the display unit N is f2n-1.
The frequency conversion processing is performed so that the signal is in the frequency band of f2n. This output signal is mixed by the mixing unit 49 to form a frequency division multiplexed signal.

The line I / O unit 45 sends out the frequency division multiplexed signal to the lower line of the LAN cable 4. Also, it performs processing for receiving and decoding command data information sent on the uplink, and decodes the request information RQ. This information is supplied to the system control unit 14 in FIG.

In the digital modulation, adoption of a measure against a code error in LAN transmission (addition of an error detection code or an error correction code) may be considered in some cases.

FIG. 11 shows a fourth example of the configuration of the run control unit, which is suitable for transmitting low bit rate data information in the form of frequency division multiplex transmission on the down line of the LAN. The third configuration example is different from the third configuration example in FIG. Compression section 46-1
46-N extracts the information corresponding to the display units 1 to N from the signal supplied through the YUV bus 10, performs high-efficiency encoding processing, and generates data in which the amount of information is compressed. Then, the digital modulators 47-1 to 47-N perform predetermined digital modulation (for example, 64QAM).

Next, FIG. 12 shows a configuration example of an information outlet. The input unit 50 extracts data information of the corresponding display unit from the down line of the LAN cable 4. That is, in the time-division multiplex serial transmission, the synchronization code SYNC of the header code of the packet and the display code ID are detected from the bit stream signal, and the packet data of the corresponding display is detected.
Extract data information. In the frequency division multiplexing, a signal of a frequency band assigned to a corresponding display unit (display unit 1).
Then, a signal having a frequency band of f1 to f2 is extracted.

In a predetermined decoding process, that is, in time-division multiplex serial transmission, the decoding unit 51 separates a signal of a data portion of packet data information and outputs a decoded signal DATA.
In frequency division multiplexing, signal processing of RF demodulation and digital demodulation is performed, and a decoded signal DATA is output. In addition,
If the countermeasure against the code error is taken, the operation of detecting and correcting the code error is also performed.

On the other hand, various command signals C from the display unit
In the MD, the output unit 52 performs a predetermined coding process such as coding and adding a display unit code, and sends out the output to the upstream line of the LAN cable 4.

Next, an example of the configuration of the display unit will be described with reference to FIGS.

FIG. 13 is suitable for a case where the decoded signal DATA is not subjected to compression processing such as high efficiency coding.

The separating section 53 separates the image information data DV and the audio information data DA from the decoded signal DATA.

The image processing section 54 performs processing for converting the image information data DV (the luminance signal Y and the color difference signals U, V) into three primary color RGB signals. The image display unit 55 has a display device P
It is composed of DP or LCD flat display,
An image of the input three primary color signals VD is displayed on a display.

The audio processing section 56 performs signal processing such as sound quality improvement and volume adjustment, and outputs the output signal AD to the audio reproduction section 57.
To play.

On the other hand, remote control receiving section 58 receives viewer request information from a remote control terminal (not explicitly shown). Command detector 59 determines the content of the received information and outputs a corresponding command signal CMD.

FIG. 14 is suitable for a decoded signal DATA that has been subjected to a compression process such as high-efficiency encoding. 13 differs from the configuration example of FIG. 13 in that an image decompression composite unit 60 and an audio composite unit 61 are provided to decompress the compressed data.

The image decompression / decoding section 60 is provided with the image information data DV.
Of the luminance signal Y and the color difference signals U, V
Is decrypted. Then, the image processing unit 54 outputs the three primary colors RGB.
Performs processing to convert to a signal.

The audio decoding section 61 performs a predetermined decoding process of the audio information data DA. The combined audio information is subjected to signal processing such as sound quality improvement and volume adjustment in the audio processing unit 56.

As described above, according to the present embodiment, a home AV-LAN system having excellent convenience and expandability can be realized.

Next, a second embodiment of the present invention will be described with reference to the block diagram of FIG. In this embodiment, the LAN
The main bus of the downstream line and the upstream line is preferably constructed with a coaxial cable, an optical fiber cable, or a twisted pair line, and the sub-bus is preferably constructed with a wireless cable. In the figure, blocks denoted by the same reference numerals as those in FIG. 1 have the same functions as those in FIG. In the second embodiment, the gateway 62 is connected to the information outlet 2, and information transmission with the display unit 3 is performed by radio signals.

The gateway 62 performs communication when connecting the main bus and the sub bus. That is, the downlink data information extracted by the information outlet is converted into a radio signal and transmitted to the sub-bus of the wireless cable. Also,
A radio signal from the display unit 3 is received, converted into command data information, and transmitted to an information outlet.

The display unit 3 receives the radio signal of the sub bus from the gateway, converts the signal into data information, and decodes the data to reproduce the image and audio signals obtained by the image display unit and the audio reproduction unit. I do. Also, it converts the viewer's request information and the like into a radio signal and sends it out to the gateway. The transmission / reception unit of the radio wave signal can be realized by the conventional technology, and the others can be realized by the same configuration as that of the above-described first embodiment.

Next, a third embodiment of the present invention will be described with reference to the block diagram of FIG. In this embodiment, the LAN
The downstream main bus and the upstream line are preferably constructed with a coaxial cable, an optical fiber cable, or a twisted pair line, and the downstream sub-bus is preferably constructed with a wireless cable. In this embodiment, 2
Two gateways are provided.

The gateway 63 performs communication when connecting the main bus and the sub bus. That is, the downlink data information extracted by the information outlet is converted into a radio signal and transmitted to the sub-bus of the wireless cable. The radio signal from the sub-bus is received by the display unit 3, converted into data information, and the image and audio signals obtained by decoding the data are reproduced by the image display unit and the audio reproduction unit.

A signal such as viewer request information is sent to the gateway 64 via a twisted pair line or the like. The gateway 64 converts the request information from the display unit 3 into command data information and sends it to the information outlet.

Next, a fourth embodiment of the present invention will be described with reference to the block diagram of FIG. In this embodiment, the LAN
The downstream line is suitable for constructing a main bus with a coaxial cable, an optical fiber cable, or a twisted pair line, and the sub-bus with a wireless cable, and the upstream line with a power line. 1 in the figure is a media terminal, 2
Is an information outlet, 3 is a display section, 4 is a LAN cable,
63 and 65 are gateways, 66 is a blocking filter, and 67 and 68 are power lines.

The media terminal 1 transmits data information via a LAN cable 4 which is a main bus of a LAN. The command data from the display unit 3
The data is received via the upper power line 67 of the LAN.

The LAN cable 4 is a coaxial cable, an optical fiber cable, or an LA cable with a twisted pair.
A main bus of N downlinks is constructed, and data information is transmitted in the form of time division multiplex serial transmission or frequency division multiplex transmission.

The information outlet 2 is used for transmitting transmission data of the downlink.
The relevant data information is extracted from the data information.

The gateway 63 performs communication when connecting the main bus and the sub bus. That is, the downlink data information extracted by the information outlet is converted into a radio signal and transmitted to the sub-bus of the wireless cable.

The display unit 3 receives the radio signal of the sub-bus from the gateway 63, converts the signal into data information, and decodes the data to produce an image and audio signal. Reproduce. Further, a signal such as viewer request information is transmitted to the gateway 65 via a twisted pair line or the like. The gateway 65 converts the request information from the display unit 3 into command data information, and sends out the command data information to the power line 67, which is the upstream line of the LAN.

The blocking filter 66 prevents the command data information from leaking outside through the power line 68.

Next, a fifth embodiment of the present invention will be described with reference to the block diagram of FIG. In this embodiment, the wireless LA of the wireless cable is used for both the downlink and the uplink.
It is suitable for building with N. In the figure, 1 is a media terminal, 3 is a display unit, 62 is a gateway, and 69 is a wireless LAN.

In this embodiment, the reception of command data information from the display unit 3 and the transmission of data information according to the command data are performed by radio signals via the wireless LAN 69. For example, the data information signal is transmitted as an SS (Spread Spectrum) signal or a radio wave signal converted into a frequency division multiplexed signal.
Further, the gateway 62 performs an operation of a radio wave relay function in the wireless LAN 69.

The display unit 3 receives the signal of the corresponding data information from the radio wave of the gateway 62, converts the signal into the data information, decodes the data information, and displays the image and sound signals obtained by decoding the signal. Is played back by the audio playback unit. Also, it converts the request information of the viewer into a radio signal and sends it to the gateway 62.

In the embodiment of the present invention described above,
AV devices have been described as examples of devices connected to the LAN. However, the present invention is not limited to this.
An AV-LAN system can be constructed by connecting various information devices such as a personal computer and a telephone to N.

The AV-LAN system of the present invention
It can also be realized in a form incorporating security functions such as a gas leak alarm, a fire alarm and a security alarm.

[0082]

According to the present invention, it is possible to construct a system that does not require a complicated connection operation between AV devices, and enables viewing and information collection at any place in the home. The function can be improved by adding a module to the media terminal. For this reason, a remarkable effect is obtained for improving convenience and expandability.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating a configuration example of a media terminal.

FIG. 3 is a configuration example diagram of an IF unit.

FIG. 4 is a configuration example diagram of a package unit.

FIG. 5 is a diagram illustrating a configuration example of a decode unit.

FIG. 6 is a configuration example diagram of a DVE unit.

FIG. 7 is a diagram illustrating a configuration example of a memory bank;

FIG. 8 is a first configuration example of a run control unit.

FIG. 9 is a second configuration example of the run control unit.

FIG. 10 is a third configuration example of the run control unit.

FIG. 11 is a fourth configuration example of the run control unit.

FIG. 12 is a configuration example diagram of an information outlet.

FIG. 13 is a first configuration example of a display unit.

FIG. 14 is a second configuration example of the display unit.

FIG. 15 is a block diagram of a second embodiment of the present invention.

FIG. 16 is a block diagram of a third embodiment of the present invention.

FIG. 17 is a block diagram of a fourth embodiment of the present invention.

FIG. 18 is a block diagram of a fifth embodiment of the present invention.

FIG. 19 is a schematic diagram of a transmission form of digital data.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Media terminal, 2 ... Information outlet, 3 ... Display part, 4 ... LAN cable, 5 ... IF unit, 6 ... Package unit, 7 ... Digital bus, 8 ... Analog bus, 9 ... Deco- Unit, 10 ... YUV bus, 11 ...
Run control unit, 12: DVE unit, 13: memory bank, 14: system control unit, 15: control bus, 1
6 tuner, 17 satellite tuner, 18 satellite digital tuner, 19 front end, 20 modem, 2
1: Analog VCR, 22: Digital VCR, 23: D
VD, 24 ... CD-ROM, 25 ... SD demodulation unit, 26 ...
Non-standard SD demodulator, 27: MUSE decoder, 28: Digital broadcast decoder, 29: Data broadcast decoder, 30
... SRC, 31 ... frame conversion, 32 ... IP conversion, 3
3 Image synthesis, 34 Work RAM, 35 Control
La, 36: Image compression unit, 37: Memory unit, 38: DVD
-SRAM, 39 ... HDD, 40 ... Semiconductor memory, 41
... image decompression unit, 42 ... control unit, 43 ... packetization unit, 4
4 time division multiplexing unit, 45 line I / O unit, 46 compression unit,
47 digital modulation section, 48 RF modulation section, 49 mixing section, 50 input section, 51 decoding section, 52 output section, 53
... Separation unit, 54 ... Image processing unit, 55 ... Image display unit, 56
... voice processing unit, 57 ... voice reproduction unit, 58 ... remote control reception unit, 59 ... command detection unit, 60 ... image expansion decoding unit, 6
1 ... Voice decoding unit, 62, 63, 64, 65 ... Gateway, 66 ... Blocking filter, 67, 68 ... Power line, 69 ... Wireless LAN.

Continued on the front page (72) Inventor Noboru Nojima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the multimedia system development headquarters of Hitachi, Ltd. (72) Masato Sugiyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi, Ltd. Multimedia System Development Division (72) Inventor Kentaro Teranishi 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Ltd. Hitachi, Ltd. Multimedia System Development Division (72) Inventor Takaaki Nishiseto Yokohama, Kanagawa Prefecture 292 Yoshida-cho, Totsuka-ku, Hitachi, Ltd.Video and Media Division, Hitachi, Ltd. (72) Inventor Yasuhiro Kasahara 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Japan Hitachi, Ltd. Video and Media Division (72) Inventor Satoshi Takahashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Hitachi, Ltd.

Claims (3)

[Claims] 1. A media terminal having a function of integrally managing reception, recording, and reproduction of various types of media information of broadcast, communication, and package, and images and sounds connected to the media terminal by a LAN. A home AV-LAN system having a plurality of display units for reproducing data from the media terminal, a downlink for transferring data from the media terminal to the display unit, and command data from the display unit to the media terminal. A home A characterized in that the upstream line for transferring data is constructed by a wired LAN of a coaxial cable, an optical fiber cable, or a twisted pair line.
V-LAN system. 2. The home AV-LAN system according to claim 1, wherein said LAN is constructed by a wireless LAN of a wireless cable instead of said wired LAN. 3. A domestic AV-L according to claim 1 or 2.
In the AN system, in the data transfer on the downlink, the data to be transferred is packetized in a predetermined byte unit and multiplexed in a time division manner for transmission, or the packetized data is digitalized. An in-home AV-LAN system using any one of frequency division multiplexing transmission modes in which modulation is performed and arranged in a predetermined frequency band.