JP3376919B2 - Subscriber side optical receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber side optical receiver in an optical subscriber access system, and more particularly to a subscriber side optical receiver capable of receiving digital broadcasting service.

[0002]

2. Description of the Related Art In recent years, a satellite having a large capacity downlink has attracted attention as a broadcasting infrastructure, and broadcasting services for distributing digital video and data using communication satellites are being developed one after another. These data distributions are basically performed using TS packets. On the other hand, GTTH (Gigabit
Incorporation of digital broadcasting into optical access systems such as the To The Home system is drawing attention. The GTTH system is described in detail in, for example, "Shibuya et al.," GTTH-Ultra-wide band flexible optical access system- ", 1996 IEICE Communications Society Conference SB-7-1" and the like.

[0003]

Satellite digital broadcasting has a very large number of channels, and contents are delivered according to hobbies and tastes. Therefore, it is expected that there will be demands for viewing by multiple users in the subscriber's home in the future. Also, as digital broadcasting becomes multi-service, it is necessary to support a plurality of services. However, in the case of the conventional satellite digital broadcasting system, an antenna or an IRD (Integrated) is provided for each service and user.
There was a problem that a Receiver Decoder was required. The present invention has been made to solve the above problems, and an object of the present invention is to provide a subscriber-side optical receiving device that enables simultaneous viewing of a plurality of users and support of a plurality of services.

[0004]

According to a first aspect of the present invention, there is provided an optical receiver for a subscriber, the optical receiver (10) for converting an input signal light into a data multiplexed signal, and a subscriber's house. Yu
Corresponding decor among multiple decoders provided for each user
Connected to the decoder and sent from this corresponding decoder.
Channel selection for the user to select the desired program
According to the signal, from the data multiplexed signal to the program
After selecting the corresponding signal and after interface conversion
A plurality of interface sections for outputting to corresponding decoders , a plurality of unit channel signals are time-division multiplexed in the data multiplexed signal, and a plurality of transport stream multiplexed signals are time-division multiplexed in each unit channel signal. Is
A plurality of transport stream signals are packet-multiplexed in each transport stream multiplexed signal. In this way, by providing the subscriber-side optical receiving device with a plurality of interface units, it is possible for a plurality of users to simultaneously view and listen. Further, as described in claim 2, the data multiplexed signal output from the optical receiver is distributed to all the interface units (2c, 3c), and the interface unit time-division demultiplexes the data multiplexed signal. Multiple signal separator (2
7) and the multiplexed signal according to the channel selection signal
From multiple unit channel signals output from the separator
Select and output the unit channel signal corresponding to the program.
And a switch circuit (26). In this way, by inputting all the signals received by the optical receiver on the subscriber side to each interface unit, each interface unit can select an arbitrary signal from the received signals. Further, as described in claim 3, a multiple signal separator (11) for time-division demultiplexing the data multiplexed signal output from the optical receiver is provided, and a plurality of units output from the multiple signal separator. The channel signal is distributed to all the interface units (2b, 3b), and the interface unit according to the channel selection signal.
A unit channel corresponding to the program from among the channel signals
A switch circuit (20) for selecting and outputting a digital signal . In this way, by inputting all the signals received by the optical receiver on the subscriber side to each interface unit, each interface unit can select an arbitrary signal from the received signals. In addition, claim 4
As described, the multiplexed signal separator for time division demultiplexing the data multiplexed signal output from the optical receiver (11), before
From the demultiplexer according to the channel selection signal
From the output multiple unit channel signals to the program
By selecting the corresponding unit channel signal and a switch circuit for outputting (12, 12a), a unit of channel signal output from the switching circuit is obtained so as to distribute to said interface unit. As described above, since the desired unit channel signal is selected from the signals received by the optical receiver on the subscriber side and input to the interface section, the circuit scale of each interface section can be reduced.

Further, as described in claim 5, the interface section (2c, 3c) is provided with the switch circuit (2).
An interface converter (23) for performing interface conversion of the output unit channel signals from 6), to the corresponding unit channel signal interface conversion
Output to the decoder . In this way, since each interface unit in the optical receiver on the subscriber side outputs a desired unit channel signal to the outside (decoder), the circuit scale of each interface unit can be reduced. Further, as described in claim 6, the interface unit (2b, 3b) is configured to receive the channel selection signal.
According No. selector circuit (2 to select a transport stream multiplexed signal corresponding to the program from the outputted unit channel signal from the switch circuit (26)
0) and an interface conversion circuit (23) for performing interface conversion of the transport stream multiplex signal output from the selector circuit, and the interface converted transport stream multiplex signal corresponds to the above.
Output to the decoder . In this way, each interface unit in the optical receiver on the subscriber side selects a desired transport stream multiplexed signal from the unit channel signals and outputs it to the outside (decoder). It is possible to reduce the scale and effectively use the resources of in-home wiring. Further, the current IRD (Integrated Receiver Decoder) has an input / output port for a transport stream multiplexed signal, and therefore has excellent compatibility. In addition, as described in claim 7, the interface unit (2, 3, 2a, 3
a, 2d, 3d), according to the channel selection signal,
A selector circuit (20) for selecting a transport stream multiplex signal corresponding to the program from the unit channel signals, and a transport stream multiplex signal output from the selector circuit according to the channel selection signal. A TS selection circuit (22) for selecting a transport stream signal corresponding to the program from the inside, and an interface conversion circuit (23) for performing interface conversion of the transport stream signal output from the TS selection circuit. The converted transport stream signal is output to the corresponding decoder . In this way, each interface unit in the optical receiver on the subscriber side selects a desired transport stream signal from the unit channel signals and outputs it to the outside (decoder). The bandwidth can be minimized and the resource utilization efficiency can be improved.

Further, as described in claim 8, the subscriber-side optical receiving device has an encryption storage device (13) for storing encryption information necessary for decryption of a transport stream multiplexed signal, The interface part (2, 3)
Between the selector circuit (20) and the TS selection circuit (22), there is provided a decryption circuit (21) for decrypting the transport stream multiplexed signal output from the selector circuit based on the encryption information. In this way, all the interface units in the optical receiver on the subscriber side share one cryptographic storage device, so that the circuit scale of the optical receiver on the subscriber side can be reduced. Further, as described in claim 9, the interface unit (2a, 3
a) is a cipher storage device (24) for storing cipher information necessary for descrambling the transport stream multiplexed signal;
A deciphering circuit (21) provided between the selector circuit (20) and the TS selection circuit (22) for deciphering the transport stream multiplexed signal output from the selector circuit based on the cipher information. Is. As described above, by providing the cryptographic storage device in each interface unit, the circuit scale of the subscriber side optical receiving device main body can be reduced. Further, as described in claim 10, the interface unit (2d, 3d) is arranged between the selector circuit (20) and the TS selection circuit (22) to detect the transport stream multiplexed signal output from the selector circuit. Decryption circuit (2 that performs decipherment based on cryptographic information
1), and the cipher information necessary for the descrambling circuit is sent from the outside of the optical receiver on the subscriber side through the interface conversion circuit. in this way,
Since the cryptographic information necessary for the descrambling circuit is sent from the outside (decoder) of the subscriber side optical receiving device, it is not necessary to provide a cryptographic storage device in the subscriber side optical receiving device. The circuit scale of the receiving device can be significantly reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram of an optical subscriber access system showing a first embodiment of the present invention. The optical receiver 1 on the subscriber side according to the present embodiment includes an optical receiver (O / E) 10, a multiplex signal demultiplexer (DMUX) 11, a switch circuit 12, a cipher memory device 13, a control circuit 14, decoders 4 and 5. It has interface sections 2 and 3 respectively corresponding to.

The subscriber side optical receiver 1 is connected to decoders 4 and 5 provided for each user by in-house wirings 6 and 7, and receives an input optical signal LI sent from a center station (not shown). It receives and sends to the decoders 4 and 5 via the interface units 2 and 3, respectively.

The optical signal LI sent from the center station is
The signal is detected by the optical receiver 10 in the subscriber side optical receiver 1, converted into a data multiplex signal DA, and output to the multiplex signal separator 11. In this embodiment, the code rate of the data multiplexed signal DA is 622.08 Mbps. In this data multiplexed signal DA, unit channel signals having a code rate of 155.52 Mbps are bit-multiplexed for four channels.

Further, each unit channel signal corresponds to five lines of satellite digital broadcasting, 29.16.
A transport stream (hereinafter abbreviated as TS) multiplexed signal having a code rate of 2 Mbps is time-division multiplexed. The time division multiplexing of the TS multiplex signal is described, for example, in “Domon et al.,“ Gigabit To The Home ”.
Examination of accommodation method of digital satellite broadcasting signal in e ”,
1997, IEICE General Conference B-8-58 ”and the like.

The multiplex signal separator 11 bit-separates the input data multiplex signal DA and outputs the unit channel signals UC1, UC2, UC3, UC4 for four channels to the switch circuit 12. The switch circuit 12 is the control circuit 1
According to the channel selection control signal C1 output from 4,
Two unit channel signals are selected and output from the unit channel signals UC1, UC2, UC3, UC4.

UC5 is a unit channel signal addressed to the interface unit 2 (decoder 4) selected according to the channel selection control signal C1. Similarly, UC6 is a unit channel signal addressed to the interface unit 3 (decoder 5). Is. The unit channel signals UC5 and UC6 output from the switch circuit 12 are input to the interface units 2 and 3, respectively.

The interface unit 2 includes a selector circuit (S
EL) 20, decryption circuit (DSCR) 21, TS selection circuit (DMUX) 22, and interface conversion circuit (I
/ F) 23. The configuration of the interface unit 3 is also the same. As described above, the unit channel signal is time-division-multiplexed with the TS multiplex signals corresponding to five lines of satellite digital broadcasting.
MPEG2-TS signals for 5 programs are packet-multiplexed.

A selector circuit 20 in the interface section 2
Is a desired TS from the unit channel signal UC5 according to the channel selection control signal C2 output from the control circuit 14.
The multiplex signal STM is selected and output to the descrambling circuit 21.

The descrambling circuit 21 receives the TS multiplexed signal S based on the cipher information signal K output from the cipher storage device 13.
Decryption of TM is performed, and the decrypted TS multiple signal T
Output M. The TS selection circuit 22 responds to the channel selection control signal C3 output from the control circuit 14 to extract a desired MPEG2-TS from the decrypted TS multiplex signal TM.
The signal PE is selected, and this is selected by the interface conversion circuit 23.
Output to.

In the present embodiment, IEEE 1394 is used as the transmission method for the home wirings 6 and 7, and the interface conversion circuit 23 sends the MPEG2-TS signal PE to the IE.
The signal is converted into a signal conforming to the EE1394 synchronous (Isochronous) transfer mode, and this signal is sent to the in-home wiring 6 as an in-home downlink signal HD.

The IEEE 1394 is described in detail in, for example, "Nyu et al.," IEEE 1394 POF home network ", 1996 IEICE Communications Society Conference SB-7-4" and the like.

The interface conversion circuit 23 terminates the in-house upstream signal HU transmitted from the decoder 4 via the in-house wiring 6, takes out the channel selection signal CS from this in-house upstream signal HU, and sends it to the control circuit 14. .

Next, the exchange of control signals in the optical receiver 1 on the subscriber side will be described. The switch circuit 12, the interface units 2 and 3, the encryption storage device 13, and the control circuit 14 are connected by a control line 80. First, the control circuit 1
Reference numeral 4 controls the control line 80, processes the channel selection signal CS input from the interface conversion circuit 23, and then switches the channel selection control signals C1, C2, C3 corresponding to the channel selection signal CS to a switch circuit. 12, the selector circuit 20, and the TS selection circuit 22 respectively.

That is, the control circuit 14 follows the channel selection signal CS for each user to select a desired service (program), and the MPEG2-TS corresponding to the service.
A channel selection control signal C3 for selecting the signal PE,
TS multiple signal ST including this MPEG2-TS signal PE
Channel selection control signal C2 for selecting M, this T
The channel selection control signal C1 for selecting the unit channel signal UC5 including the S multiplex signal STM is generated.

The encryption storage device 13 is a TS multiplex signal STM.
The cryptographic information necessary for decryption is stored, and the cryptographic information signal K indicating this cryptographic information is sent to the decryption circuit 21.
Next, the operation of the decoders 4 and 5 will be described. The decoder 4 includes an interface conversion circuit 40 and a decoding circuit 41. The configuration of the decoder 5 is similar.

Interface conversion circuit 4 in the decoder 4
0 terminates the in-home downlink signal HD transmitted from the optical receiver 1 on the subscriber side.
The PEG2-TS signal PE is taken out and output to the decoding circuit 41. In addition, the interface conversion circuit 40 receives the channel selection signal CS input from the outside by IEEE1394.
The signal is converted into a signal conforming to the Asynchronous transfer mode of and is sent to the in-home wiring 6 as an in-home upstream signal HU.

The decoding circuit 41 uses the MPEG2-TS signal P.
E is decoded, and the video signal VI obtained as a result of this decoding is output. In this way, the desired service is provided to the user, and the image is displayed on the display device (not shown) or the like that receives the video signal VI.

Although the operation of the decoder 4 and the interface section 2 has been described in the present embodiment, it goes without saying that the decoder 5 and the interface section 3 also perform the same operation.

[Second Embodiment] FIG. 2 is a block diagram of an optical subscriber access system showing a second embodiment of the present invention. The same components as those in FIG. 1 are designated by the same reference numerals. is there. In the first embodiment, the cryptographic storage device 13 and the control circuit 14 are provided in the main body of the optical receiver of the subscriber side, and the signal selection of all the interface units 2 and 3 is controlled by this. Subscriber-side optical receiver 1 according to the present embodiment
In a, the interface units 2a and 3a are provided with a cryptographic storage device 24 and a control circuit 25, and
The signal selection is controlled for each a.

That is, the interface unit 2a of the present embodiment includes a selector circuit (SEL) 20, a descrambling circuit (DSCR) 21, a TS selection circuit (DMUX) 22, an interface conversion circuit (I / F) 23, and a cipher memory. It is composed of a device 24 and a control circuit 25. The configuration of the interface unit 3a is similar.

The control circuit 25 processes the channel selection signal CS input from the interface conversion circuit 23 and then outputs the channel selection control signals C21, C22, C23 corresponding to the channel selection signal CS to the switch circuit 12
a, selector circuit 20, and TS selection circuit 22, respectively.

That is, the control circuit 25 follows the channel selection signal CS for each user to select a desired service, and the MPEG2-TS signal PE corresponding to the service.
Channel selection control signal C23 for selecting
A channel selection control signal C22 for selecting the TS multiplex signal STM including the PEG2-TS signal PE and a channel selection control signal C21 for selecting the unit channel signal UC5 including the TS multiplex signal STM are generated.

The cryptographic storage device 24 is a TS multiplex signal STM.
The cryptographic information necessary for decryption is stored, and the cryptographic information signal K indicating this cryptographic information is sent to the decryption circuit 21.
In the first embodiment, the switch circuit 12, the interface units 2 and 3, and the cryptographic storage device 13 and the control circuit 14 are connected by the control line 80. However, in the present embodiment,
The switch circuit 12a and the interface unit 2a are connected by a control line 81, and the switch circuit 12a and the interface unit 3a are connected by a control line 82.

Therefore, the switch circuit 12a has a plurality of control input ports and controls one output port for each control input port. That is, the switch circuit 12a is responsive to the channel selection control signal C21 sent from the interface section 2a.
The unit channel signal UC5 addressed to a is selected, and the channel selection control signal C31 sent from the interface unit 3a.
According to the unit channel signal U addressed to the interface unit 3a
Select C6.

The channel selection control signal CS1 used in the first embodiment is the channel selection control signals C21 and C21.
This corresponds to the one obtained by multiplexing 31. Other configurations are the same as those in the first embodiment. In this way, the same function as that of the first embodiment can be realized.

[Third Embodiment] FIG. 3 is a block diagram of an optical subscriber access system showing a third embodiment of the present invention. The same components as those in FIGS. 1 and 2 are designated by the same reference numerals. It is attached. In the first and second embodiments, the unit channel signal U selected by the switch circuits 12 and 12a is used.
C5 and UC6 are input to the interface units 2, 3, 2a and 3a, and the in-home downlink signal HD obtained by interface-converting the MPEG2-TS signal PE is transmitted from each interface unit.

On the other hand, in this embodiment, all the unit channel signals UC are supplied to the respective interface units 2b and 3b.
1, UC2, UC3, UC4 are input, and the in-home downlink signal HD obtained by interface-converting the TS multiplex signal STM is transmitted from each interface unit 2b, 3b.

That is, in this embodiment, the unit channel signals UC1 and UC output from the multiplex signal separator 11 are output.
2, UC3 and UC4 are branched, and all of them are input to the respective interface units 2b and 3b. Interface part 2
b is composed of a switch circuit 26, a selector circuit 20, an interface conversion circuit 23, and a control circuit 25b. The configuration of the interface unit 3b is also the same.

In the interface section 2b, the switch circuit 26 first responds to the channel selection control signal C21 output from the control circuit 25b in accordance with the unit channel signal UC.
One unit channel signal is selected from among 1, UC2, UC3, and UC4, and this is output to the selector circuit 20 as a unit channel signal UC5.

The selector circuit 20 selects a desired TS multiplex signal STM from the unit channel signal UC5 according to the channel selection control signal C22 output from the control circuit 25b and outputs it to the interface conversion circuit 23.

The interface conversion circuit 23 synchronizes the input TS multiplex signal STM with the IEEE1394 synchronization (Isoc).
hronous) A signal conforming to the transfer mode is converted, and this is sent to the in-home wiring 6 as an in-home downlink signal HD. Further, the interface conversion circuit 23 terminates the in-home upstream signal HU transmitted from the decoder 4a via the in-home wiring 6 and uses the in-home upstream signal HU to select the channel selection control signal C.
44 is taken out and sent to the control circuit 25b.

Next, the exchange of control signals in the optical receiver 1b on the subscriber side will be described. Switch circuit 26,
The selector circuit 20, the interface conversion circuit 23, and the control circuit 25b are connected by a control line 83. The control circuit 25b sends the channel selection control signals C21 and C22 to the switch circuit 26 and the selector circuit 20, respectively, according to the channel selection control signal C44 input from the interface conversion circuit 23.

That is, the control circuit 25b responds to the channel selection control signal C44 with M corresponding to the desired service.
A channel selection control signal C22 for selecting the TS multiplex signal STM including the PEG2-TS signal PE and a channel selection control signal C21 for selecting the unit channel signal UC5 including the TS multiplex signal STM are generated.

Next, the operation of the decoders 4a and 5a will be described. The decoder 4a includes the interface conversion circuit 4
0, decryption circuit 41, decryption circuit 42, TS selection circuit 4
3, a cryptographic storage device 44, and a control circuit 45.
The decoder 5a has the same configuration.

The interface conversion circuit 40 in the decoder 4a terminates the home downlink signal HD transmitted from the subscriber side optical receiver 1b, extracts the TS multiple signal STM from the home downlink signal HD, and deciphers the circuit. To 42. Further, the interface conversion circuit 40 converts the channel selection control signal C44 output from the control circuit 45 into a signal conforming to the Asynchronous transfer mode of IEEE 1394, and sends this to the in-home wiring 6 as an in-home upstream signal HU. .

The cryptographic memory device 44 is a TS multiple signal STM.
The encryption information necessary for decryption is stored, and an encryption information signal K indicating this encryption information is sent to the decryption circuit 42.
The decryption circuit 42 decrypts the TS multiple signal STM based on the encrypted information signal K output from the encryption storage device 44, and outputs the decrypted TS multiple signal TM.

The TS selection circuit 43, in accordance with the channel selection control signal C43 output from the control circuit 45, selects the desired MPEG2-TS from the decrypted TS multiple signal TM.
The signal PE is selected and output. The decoding circuit 41 uses the MPE
The G2-TS signal PE is decoded and the video signal VI obtained as a result of this decoding is output.

Next, the exchange of control signals between the decoders 4a and 5a will be described. Control circuit 45, interface conversion circuit 40, deciphering device 42, TS selection circuit 43,
The decryption circuit 41 and the encryption storage circuit 44 are connected by a control line 84.

The control circuit 45 processes the channel selection signal CS inputted from the outside, and thereafter, the channel selection control signals C43 and C44 corresponding to the channel selection signal CS.
To the TS selection circuit 43 and the interface conversion circuit 40, respectively.

That is, the control circuit 45 follows the channel selection signal CS for each user to select a desired service, and the MPEG2-TS signal PE corresponding to the service.
Channel selection control signal C43 for selecting
A channel selection control signal C44 for selecting the TS multiplex signal STM including the PEG2-TS signal PE and the unit channel signal UC5 including this TS multiplex signal STM is generated. In this way, the same function as that of the first embodiment can be realized.

[Fourth Embodiment] FIG. 4 is a block diagram of an optical subscriber access system according to a fourth embodiment of the present invention. The same components as those in FIGS. It is attached. In the third embodiment described above, all the unit channel signals UC1 and UC are provided to the interface units 2b and 3b.
2, UC3, UC4 are input, and each interface unit 2
An in-home downlink signal HD obtained by interface conversion of the TS multiplex signal STM is transmitted from b and 3b.

On the other hand, in the present embodiment, the data multiplexed signal DA is input to each of the interface units 2c and 3c, and the in-home downlink signal HD obtained by interface conversion of the unit channel signal UC5 is transmitted from each of the interface units 2c and 3c. It

That is, in the present embodiment, the data multiplexed signal DA output from the optical receiver 10 is branched in the optical receiver 1c on the subscriber side, and each interface unit 2c,
Sent to 3c. The interface unit 2c includes a multiplex signal separator 27, a switch circuit 26, an interface conversion circuit 23, and a control circuit 25c. The configuration of the interface unit 3c is also the same.

In the interface section 2c, the multiplex signal separator 27 first performs bit separation of the input data multiplex signal DA, and unit channel signals UC for four channels.
1, UC2, UC3, UC4 are output to the switch circuit 26. The switch circuit 26 selects one unit channel signal from the unit channel signals UC1, UC2, UC3, UC4 in accordance with the channel selection control signal C21 output from the control circuit 25c, and selects it as the unit channel signal UC.
5 to the interface conversion circuit 23.

The interface conversion circuit 23 converts the input unit channel signal UC5 into a signal conforming to the IEEE1394 synchronous (Isochronous) transfer mode, and sends this to the in-home wiring 6 as an in-home downlink signal HD. Further, the interface conversion circuit 23 terminates the in-home upstream signal HU transmitted from the decoder 4b through the in-home wiring 6, takes out the channel selection control signal C41 from the in-home upstream signal HU, and sends it to the control circuit 25c.

Next, the exchange of control signals in the optical receiver 1c on the subscriber side will be described. The switch circuit 26, the interface conversion circuit 23, and the control circuit 25c are connected by a control line 85. The control circuit 25c outputs the channel selection control signal C21 to the switch circuit 26 in response to the channel selection control signal C41 input from the interface conversion circuit 23.

Next, the operation of the decoders 4b and 5b will be described. The decoder 4b is the interface conversion circuit 4
0, selector circuit 46, decryption circuit 41, deciphering circuit 4
2, TS selection circuit 43, encryption storage device 44, control circuit 4
5b. The decoder 5b has the same configuration.

The interface conversion circuit 40 in the decoder 4b terminates the home downlink signal HD transmitted from the subscriber side optical receiver 1c, extracts the unit channel signal UC5 from the home downlink signal HD, and selects the selector circuit 4
Output to 6. In addition, the interface conversion circuit 40
Channel selection control signal C output from the control circuit 45b
41 is converted into a signal conforming to the IEEE1394 Asynchronous transfer mode, and this is converted into a home upstream signal HU.
Is sent to the house wiring 6.

The selector circuit 46 selects a desired TS multiplex signal STM from the unit channel signal UC5 according to the channel selection control signal C42 output from the control circuit 45b and outputs it to the descrambling circuit 42. The decryption circuit 42 decrypts the TS multiple signal STM based on the encryption information signal K output from the encryption storage device 44,
The decrypted TS multiple signal TM is output.

The TS selection circuit 43 receives the desired MPEG2-T from the decrypted TS multiplex signal TM according to the channel selection control signal C43 output from the control circuit 45b.
The S signal PE is selected and output. The decoding circuit 41 uses MP
The EG2-TS signal PE is decoded, and the video signal VI obtained as a result of this decoding is output.

Next, the exchange of control signals between the decoders 4b and 5b will be described. Control circuit 45b, interface conversion circuit 40, selector circuit 46, descrambling device 4
2, TS selection circuit 43, decryption circuit 41 and cipher storage circuit 4
4 are connected by a control line 86.

The control circuit 45b processes the channel selection signal CS inputted from the outside, and thereafter, the channel selection control signals C41 and C4 corresponding to the channel selection signal CS.
2, C43 are sent to the interface conversion circuit 40, the selector circuit 46, and the TS selection circuit 43, respectively.

That is, the control circuit 45b follows the channel selection signal CS for each user to select a desired service, and the MPEG2-TS signal P corresponding to the service.
A channel selection control signal C43 for selecting E, a channel selection control signal C42 for selecting a TS multiplex signal STM including this MPEG2-TS signal PE, this TS
A channel selection control signal C41 for selecting the unit channel signal UC5 including the multiplex signal STM is generated. In this way, the same function as that of the first embodiment can be realized.

[Fifth Embodiment] FIG. 5 is a block diagram of an optical subscriber access system according to a fifth embodiment of the present invention. The same components as those in FIGS. 1 to 4 are designated by the same reference numerals. It is attached. In the first and second embodiments described above, the encryption storage device and the decryption circuit are provided in the optical receiver on the subscriber side, whereas in the present embodiment, the encryption storage device 44 is provided in each of the decoders 4c and 5c. The encryption information is provided to the descrambling circuit in the subscriber side optical receiver 1d via the in-house wirings 6 and 7.

The interface section 2d includes the selector circuit 2
0, a decryption circuit 21, a TS selection circuit 22, an interface conversion circuit 23, and a control circuit 25d. The configuration of the interface unit 3d is similar.

The control circuit 25d processes the channel selection signal CS input from the interface conversion circuit 23 and then outputs the channel selection control signals C21, C22, C23 corresponding to the channel selection signal CS to the switch circuit 12
a, selector circuit 20, and TS selection circuit 22, respectively. Further, the interface conversion circuit 23 extracts the cipher information signal K from the in-home upstream signal HU and sends it to the cipher removal circuit 21.

The decoder 4c comprises an interface conversion circuit 40, a decryption circuit 41, and an encryption storage device 44. The configuration of the decoder 5c is also the same. In the decoder 4c, the interface conversion circuit 40 first terminates the home downlink signal HD transmitted from the optical receiver 1d on the subscriber side, and the MPEG2-T from the home downlink signal HD is terminated.
The S signal PE is taken out and output to the decoding circuit 41.

Further, the interface conversion circuit 40 receives the channel selection signal CS input from the outside in IEEE13.
In addition to converting into a signal conforming to the Asynchronous transfer mode of 94, the cipher information signal K output from the cipher storage device 44 is also converted into a signal conforming to the Asynchronous transfer mode of IEEE 1394,
These are sent to the home wiring 6 as the home upstream signal HU.

The decoding circuit 41 uses the MPEG2-TS signal P
E is decoded, and the video signal VI obtained as a result of this decoding is output. In this way, the same function as that of the first embodiment can be realized.

Although the five embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments and can be modified within the scope of the present invention. Nor. The IE is used as the transmission method of the home wiring of the present invention.
Although EE1394 is used, it is also possible to apply another transmission method, for example, Ethernet.

As the data multiplexed signal of the present invention, 1
622.08 Mbps, which is a bundle of four unit channel signals of 55.52 Mbps, is used.
It is also possible to apply 16 channels of 52 Mbps unit channel signals or 2.488 Gbps in which 4 channels of 622.08 Mbps unit channel signals are bundled. Furthermore, although bit multiplexing is used as the multiplexing method of the present invention, other time division multiplexing methods, for example, byte multiplexing, can be applied.

[0068]

According to the present invention, as described in claim 1, by providing a plurality of interface units in the optical receiver on the subscriber side, the service (program) is selected independently for each interface unit. Therefore, it becomes possible for a plurality of users to simultaneously view and support a plurality of services.

Further, as described in claim 4, the desired unit channel signal is selected from the signals received by the optical receiver on the subscriber side and input to the interface section. It is not necessary to provide a multiplex signal separator and a switch circuit, and the circuit scale of each interface unit can be reduced.

Further, as described in claim 5, since each interface section in the optical receiver on the subscriber side outputs a desired unit channel signal to the outside (decoder),
The circuit scale of each interface unit can be reduced.

Further, as described in claim 6, each interface section in the optical receiver on the subscriber side selects a desired transport stream multiplexed signal from the unit channel signals and outputs it to the outside (decoder). Since this is done, the circuit scale of each interface unit can be reduced, and the resources of the in-home wiring can be effectively used. Also, the current I
The RD (Integrated Receiver Decoder) has excellent compatibility because it has an input / output port for transport stream multiplexed signals.

Further, as described in claim 7, each interface section in the optical receiver on the subscriber side selects a desired transport stream signal from the unit channel signals and outputs it to the outside (decoder). As a result, the bandwidth of the signal transmitted through the home wiring can be minimized, and the resource utilization efficiency can be improved.

Further, as described in claim 8, since all the interface units in the optical receiver of the subscriber share one cryptographic storage device, the circuit scale of the optical receiver of the subscriber is reduced. Can be reduced.

Further, as described in claim 10, the encryption information necessary for the descrambling circuit is sent from the outside (decoder) of the subscriber side optical receiving apparatus, so that the subscriber side optical receiving apparatus can receive it. Since there is no need to install a cryptographic storage device,
The circuit scale of the optical receiver on the subscriber side can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an optical subscriber access system showing a first embodiment of the present invention.

FIG. 2 is a block diagram of an optical subscriber access system showing a second embodiment of the present invention.

FIG. 3 is a block diagram of an optical subscriber access system showing a third embodiment of the present invention.

FIG. 4 is a block diagram of an optical subscriber access system showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram of an optical subscriber access system showing a fifth embodiment of the present invention.

[Description of Reference Signs] 1, 1a, 1b, 1c, 1d ... Subscriber-side optical receiver,
2, 3, 2a, 3a, 2b, 3b, 2c, 3c, 2d,
3d ... Interface unit 4, 5, 4a, 5a, 4b,
5b, 4c, 5c ... Decoder, 6, 7 ... Home wiring, 10
... Optical receiver, 11, 27 ... Multiple signal demultiplexer, 12, 12
a, 26 ... Switch circuit, 13, 24, 44 ... Cryptographic storage device, 14, 25, 25b, 25c, 25d, 45, 4
5b ... Control circuit, 20, 46 ... Selector circuit, 21, 4
2 ... Decryption circuit, 22, 43 ... TS selection circuit, 23,
40 ... Interface conversion circuit, 41 ... Decoding circuit, 80
-86 ... Control line, LI ... Optical signal, DA ... Data multiplexed signal, UC1, UC2, UC3, UC4, UC5, UC6
... Unit channel signal, CS ... Channel selection signal, C1,
C2, C3, C21, C22, C23, C31, C4
1, C42, C43, C44 ... Channel selection control signal,
K ... Encryption information signal, STM, TM ... TS multiple signal, PE
... MPEG2-TS signal, HD ... Home downlink signal, HU ...
In-house upstream signal, VI ... video signal.

Continuation of the front page (56) References JP-A-8-274711 (JP, A) JP-A-9-284219 (JP, A) edited by The Television Society, MPEG, Ohmsha, April 20, 1996, first edition , P. 55-58 Hiroshi Fujiwara, Practical MPEG textbook, ASCII Corporation, November 1, 1995, first edition, p. 211-214 (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 7/10 H04N ⁷ /16-7/173 H04N 7/22 H04J 14/00-14/08

Claims (10)

(57) [Claims] 1. An optical receiver for converting an input signal light into a data multiplexed signal, and a plurality of decoders provided for each user at a subscriber's house
Connected to the corresponding decoder,
Sent by the user to select the desired program.
According to the channel selection signal, from the data multiplexed signal
Interface conversion by selecting the signal corresponding to the program
And a plurality of interface sections for outputting to the corresponding decoder after that , a plurality of unit channel signals are time-division multiplexed in the data multiplexed signal, and a plurality of transport stream multiplexed signals are time-division multiplexed in each unit channel signal. An optical receiving device on the subscriber side, which is divided and multiplexed, wherein a plurality of transport stream signals are packet-multiplexed in each transport stream multiplexed signal. 2. The subscriber side optical receiving device according to claim 1, wherein the data multiplexed signal output from the optical receiver is distributed to all the interface units, and the interface unit transmits the data multiplexed signal. A multiplex signal separator for dividing and outputting a plurality of unit channel signals, and the multiplex signal separator according to the channel selection signal.
From the plurality of unit channel signals output from the program
And a switch circuit for selecting and outputting a unit channel signal corresponding to the subscriber side optical receiving device. 3. The optical receiver of the subscriber side according to claim 1, further comprising a multiplex signal separator for time division demultiplexing the data multiplex signal output from said optical receiver, and outputting from this multiplex signal separator. A plurality of unit channel signals to all the interface units, and the interface units follow the channel selection signal.
The program from among the plurality of unit channel signals.
A subscriber-side optical receiver comprising a switch circuit for selecting and outputting a corresponding unit channel signal . 4. The subscriber-side optical receiving device according to claim 1, wherein the multiplexed signal demultiplexer performs time division demultiplexing on the data multiplexed signal output from the optical receiver, and the demultiplexed signal demultiplexer according to the channel selection signal. A vessel
From the plurality of unit channel signals output from the program
And a switch circuit for selecting and outputting a unit channel signal corresponding to the subscriber-side optical receiving apparatus characterized by distributing the units of channel signal output from the switch circuit to the interface unit. 5. The subscriber-side optical receiving device according to claim 2, wherein the interface section includes an interface conversion circuit that performs interface conversion of a unit channel signal output from the switch circuit, and the interface-converted unit is included. An optical receiving device on the subscriber side, which outputs a channel signal to the corresponding decoder . 6. The subscriber-side optical receiving device according to claim 3, wherein the interface unit follows the channel selection signal.
Te, a selector circuit for selecting a transport stream multiplexed signal corresponding to the program from the outputted unit channel signal from said switching circuit, interface converter for interfacing conversion of the transport stream multiplex signal output from the selector circuit And a circuit for outputting an interface-converted transport stream multiplexed signal to the corresponding decoder . 7. The subscriber-side optical receiver according to claim 4, wherein the interface unit follows the channel selection signal.
Te, a selector circuit selecting <br/> transport stream multiplex signal corresponding to the program from the unit channel signal, according to the channel selection signal, from the transport stream multiplex signal output from the selector circuit The above
A TS selection circuit for selecting a transport stream signal corresponding to a program and an interface conversion circuit for performing interface conversion of the transport stream signal output from the TS selection circuit are provided, and the interface-converted transport stream signal is described above. An optical receiving device on the subscriber side, which outputs to a corresponding decoder . 8. The optical receiver on the subscriber side according to claim 7, wherein the optical receiver on the subscriber side has a cipher storage device for storing cipher information necessary for descrambling a transport stream multiplexed signal, The interface section includes a descrambling circuit for descrambling the transport stream multiplexed signal output from the selector circuit between the selector circuit and the TS selection circuit, based on the cipher information. Optical receiver. 9. The subscriber-side optical receiving device according to claim 7, wherein the interface section stores a cryptographic storage device that stores cryptographic information necessary for decrypting a transport stream multiplex signal, the selector circuit, and a TS selection. An optical receiving device on the subscriber side, which is provided between the circuits, and which performs a decryption circuit for decrypting the transport stream multiplexed signal output from the selector circuit based on the encryption information. 10. The optical receiver on the subscriber side according to claim 7, wherein the interface section encrypts the decryption of the transport stream multiplexed signal output from the selector circuit between the selector circuit and the TS selection circuit. An optical receiving device on the subscriber side, characterized in that it has a deciphering circuit for performing information-based deciphering, and the cipher information necessary for this deciphering circuit is sent from outside the optical receiving device on the subscriber side via the interface conversion circuit. apparatus.