JP2003163852A - Digital broadcast reception system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for simultaneously receiving a plurality of digital broadcast programs at low costs. <P>SOLUTION: A tuner 1 receiving a plurality of channels is provided with a stream re-multiplexer 23 and a stream re-multiplexer 24 that correspond one to one to decoders 2, 3, select a plurality of required programs and apply re-multiplexing to them on request from the decoders 2, 3, transmit each stream subjected to re-multiplexing to the decoders 2, 3, and the decoders 2, 3 use descramblers 28, 33, respectively, to descramble the stream and apply simultaneous processing to the plurality of the programs. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiving system capable of simultaneously receiving a plurality of channels, simultaneously decoding a plurality of programs and expanding the network.

[0002]

2. Description of the Related Art As a conventional digital receiver, the one described in Japanese Patent Laid-Open No. 2000-244841 is known.

The conventional digital receiving apparatus will be described below with reference to FIG.

FIG. 4 shows a system configuration diagram of a conventional digital receiving apparatus, which includes three tuner sections 11, a tuner section 12, a tuner section 13, three digital demodulation sections 14,
Digital demodulation unit 15, digital demodulation unit 16, two stream selection units 41, 42, two descrambler units 4
3, 44, stream processing unit 45, AV decoder unit 4
6 and an interface unit 47.

First, the tuner section 11, the tuner section 12,
The tuner unit 13 selects a channel that matches the band of each broadcast wave, and the digital demodulation unit 14 and the digital demodulation unit 1 are selected.
5. The digital demodulation unit 16 performs digital demodulation and error correction processing by a method that matches each broadcast wave, and outputs one transport stream from each.

Next, the stream selection section 41 selects one of the three transport streams output from the digital demodulation section 14, the digital demodulation section 15, and the digital demodulation section 16, and the descrambler section 43 scrambles the stream. Then, the stream processing unit 45 extracts the compressed video / audio data of the required program, and the AV decoder unit 46 combines the video / audio data and outputs it to an external television or the like.

On the other hand, the stream selector 42 selects one of the three transport streams output from the digital demodulator 14, digital demodulator 15, and digital demodulator 16, and the descrambler 44 descrambles it. Then, the descrambled transport stream is output to an external storage device or the like via the interface unit 47.

[0008]

In order to process a plurality of programs in this conventional digital broadcast receiving apparatus, it is necessary to prepare a plurality of stream selection sections corresponding to the number of programs and a plurality of descrambler sections corresponding to the number of programs. there were. Therefore, it is required to provide a plurality of decoder functions that simultaneously process a plurality of programs at a low cost, and at the same time, to provide a system that can expand the decoder function by adding a decoder function to each room at a low cost.

[0009]

In order to solve this problem, the present invention has a one-to-one correspondence for each decoder device (or function) in a tuner device that receives a plurality of channels or in a digital broadcast receiving device. An existing stream re-multiplexing unit is provided, a plurality of required programs are selected and re-multiplexed in response to a request from each decoder device (or function), and each re-multiplexed stream is provided to each decoder device (or function). ), And a plurality of programs can be simultaneously processed in each decoder device (or function). It is also possible to share one descrambler unit in each decoder device (function).

As a result, it is possible to inexpensively provide a plurality of decoder functions for simultaneously processing a plurality of programs, and
It is also possible to provide at low cost a system that can be expanded by adding a decoder function to each room via a network.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A digital broadcast receiving system according to the present invention includes n (n is an integer of 2 or more) tuners,
Signals of different bands are received and demodulated, and only the requested programs are selected from the generated n streams and re-multiplexed into m (m is an integer of 1 or more) streams to reconstruct m. A tuner device for transmitting a stream of a book, and one stream of m streams transmitted from the tuner device, and a plurality of programs in the stream are simultaneously decoded into video and audio, or The storage unit is provided with m decoder devices for record processing, and one tuner device having n tuners to m decoder devices each has a plurality of programs.
This has the effect of transmitting a stream of a book and simultaneously processing a plurality of programs in each decoder device.

Further, in the digital broadcast receiving system of the present invention, the tuner device selects n signals in different bands according to a request from each external decoder device, and receives n tuner parts, and n digital demodulators that digitally demodulate the signals input from the n tuner units according to each modulation method and output as a transport stream, and n transformers input from the n digital demodulators. M stream re-multiplexing units for selecting a requested program from each transport stream from the port streams, re-multiplexing the selected multiple programs into one transport stream, and outputting the same. Or a stream transmission unit for transmitting m transport streams input from the stream re-multiplexing unit to each external decoder device. It is configured, and for n streams processed by n digital demodulation sections, m stream re-multiplexing sections select necessary plural programs according to requests from external decoder devices. And re-multiplexing, and each re-multiplexed stream is transmitted from the stream transmitting unit to each external decoder device (or function).

Further, in the digital broadcast receiving system of the present invention, the tuner device selects n signals in different bands in response to a request from each external decoder device and receives the tuner parts, and the n tuner parts. The signals input from the tuner units are digitally demodulated corresponding to the respective modulation methods, and the n digital demodulation units that output as a transport stream and the signals input from the n tuner units are respectively analog-demodulated. , N analog demodulators that output analog video / audio signals, and n that digitally encodes the analog video / audio signals input from the n analog demodulators and output as a transport stream.
N digital encoder units, n transport streams input from the n digital demodulation units, and n transport streams input from the n digital encoder units, respectively. After selecting digital or analog for each tuner section, select the required program from each of the selected n transport streams, and select one of the selected multiple programs. M re-multiplexing units for re-multiplexing and outputting
And n stream processed by the n digital demodulation sections. The stream transmission section transmits m transport streams input from the stream re-multiplexing section to each external decoder device. Re-multiplexing m streams with n streams after selecting digital broadcasting or analog broadcasting from n streams generated by n digital decoder sections via n analog demodulation sections Section selects and re-multiplexes multiple required programs according to the request from each external decoder device, and re-multiplexes each one stream from the stream transmitter to each external decoder device (or function). It has the function of transmitting.

The digital broadcast receiving system according to the present invention is n
(N is an integer of 2 or more) tuners are built in, signals of different bands are received and demodulated, and only required programs are selected from the generated n streams and re-multiplexed.
(M is an integer greater than or equal to 1) Reconstruction into only one requested stream from among m streams, and decoding or recording of multiple programs in the stream into video / audio at the same time Of the remaining (m-1) streams and the (m-1) streams transmitted from the digital broadcast receiving apparatus. Received,
This is a digital broadcast that has (m-1) decoder devices for decoding a plurality of programs in a stream into video / audio at the same time or for recording processing in a storage unit, and has n tuners. Simultaneous processing of a plurality of programs is performed in the receiving device, and (m-
1) It has an effect that one stream having a plurality of programs is transmitted to each of the decoder devices, and the plurality of programs are simultaneously processed by each decoder device.

The embodiment of the present invention will be described below with reference to FIG.
3 to FIG. 3 will be described.

(Embodiment 1) FIG. 1 is a digital broadcast receiving system in which n = 3 and m = 2 corresponding to claim 1 of Embodiment 1 of the present invention, and n = 3 corresponding to claim 2. 2 is a system configuration diagram of a tuner device of the above example, and the digital broadcast receiving system includes a tuner device 1, two decoder devices 2 and a decoder device 3.

Further, the tuner device 1 includes three tuner sections 11, a tuner section 12, a tuner section, three digital demodulation sections 14, a digital demodulation section 15, a digital demodulation section 16, two stream remultiplexing sections 23, and streams. It includes a remultiplexing unit 24 and a stream transmission unit 25, and among these components, a tuner unit 11, a tuner unit 12, a tuner unit 13, a digital demodulation unit 14, and a digital demodulation unit 1
5. The digital demodulation unit 16 has the same configuration as that of the conventional example shown in FIG.

The decoder apparatus 2 is composed of a stream receiving section 27, a descrambler section 28, a stream processing section 29 with storage control, an AV decoder section 30, and a storing section 31, and the decoder apparatus 3 is a stream receiving section 32. It is composed of a descrambler unit 33, a stream processing unit 34, and an AV decoder unit 35.

The operation of the digital broadcast receiving system and the tuner device 1 configured as described above will be described below.

First, the tuner device 1 will be described. Channel selection of tuner unit 11, tuner unit 12, tuner unit 13, stream re-multiplexing unit 23, stream re-multiplexing unit 2
It is assumed that the control for selecting and re-multiplexing the plurality of four programs is performed according to the requests from the two external decoder devices 2 and 3 input via the stream transmitting unit 25. Tuner part 1
1, the tuner unit 12 and the tuner unit 13 select a channel that matches the band of each broadcast wave, and the digital demodulation unit 1
4. Digital demodulation section 15 and digital demodulation section 16 perform digital demodulation and error correction processing by a method that matches each broadcast wave, and output one transport stream from each. In the stream multiplexing unit 23, the digital demodulating unit 14, in accordance with the request from the external decoder device 2, and in the stream remultiplexing unit 24, according to the request from the external decoder device 3,
Of the three transport streams output from the digital demodulation unit 15 and the digital demodulation unit 16, two programs required for the respective external decoder devices 2 and 3 are selected, re-multiplexed, and re-multiplexed respectively. The transport stream is output to the stream transmission unit 25. Stream transmitter 25
Then, the re-multiplexed two transport streams are packetized, and the IEEE 1394 wired or IEEE 802.
One transport stream is transmitted to each of the external decoder devices 2 and 3 in accordance with the communication system such as the wireless communication of 11a.

Next, the decoder device 2 will be described. The stream receiving unit 27 depacketizes and outputs one transport stream, the descrambler unit 28 descrambles, and the storage control stream processing unit 29 compresses the two programs required for the video and audio data. Pull out as. One extracted program is stored in the storage unit 31, the storage control-equipped stream processing unit 29 time-shifts and reads it again, and the AV decoder unit 30 combines the video and audio and outputs them to an external television or the like. The other extracted program is stored in the storage unit 31 and back-recorded.

Finally, the decoder device 3 will be described. The stream receiving unit 32 depacketizes and outputs one transport stream, the descrambler unit 33 descrambles the stream, and the stream processing unit 34 performs the necessary 2
Extract one program as compressed video / audio data. The AV decoder unit 30 combines the two extracted programs with video and audio, and outputs them to an external television on a split two-screen or a picture-in-picture screen.

In the above description, n =
Although 3 and m = 2 have been described as an example, the decoder devices 2 and 3 simultaneously process two programs, respectively, so that n = 4 and m = 2 are originally desirable.

In the above description, the decoder device 2,
Although the descrambler units 28 and 29 are provided in each of the three demodulators 3, the descrambler units may be deleted, or the digital demodulation unit 14 in the tuner device 1 may be replaced with the decoder devices 2 and 3. A descrambler unit may be provided behind the digital demodulation unit 15 and the digital demodulation unit 16.

FIG. 2 is a system configuration diagram of a tuner device corresponding to claim 3 of the example of n = 2 in the second embodiment of the present invention. The tuner device 4 is replaced with the tuner device 1 in the digital receiving system of FIG. It is possible.

The tuner device 4 includes two tuner units 1.
1, 12, two digital demodulation units 14, 15, two analog demodulation units 17, 18, two digital encoder units 19, 20, two switches 21, 23, two stream remultiplexing units 23, stream remultiplexing units 24, a stream transmission unit 25, among these components, the tuner units 11 and 12, the digital demodulation units 14 and 15, the stream re-multiplexing unit 23, the stream re-multiplexing unit 24, and the stream transmission unit 25 embody the present invention. 1 has the same configuration as in FIG.

The operation of the tuner device 4 configured as described above will be described below.

The tuners 11 and 12 select a channel that matches the band of each broadcast wave, and if the selected channel is a digital broadcast channel, the digital demodulator 1
In 4 and 15, digital demodulation and error correction processing are performed by a method that matches each broadcast wave, and one transport stream is output from each. On the other hand, if the selected channel is an analog broadcast channel, the analog demodulation unit 17,
Analog demodulation at 18, digital encoder unit 19,
It is encoded by 20 and outputs one transport stream from each. The switches 21 and 22 select and output respective transports depending on whether the selected channel of the tuner units 11 and 12 is digital broadcasting or analog broadcasting.
In the stream re-multiplexing unit 23 and the stream re-multiplexing unit 24, two programs, which are required by the external decoder device, of the two transport streams output from the switches 21 and 22 are required according to the requirements of the external decoder device. Are selected and re-multiplexed, and the re-multiplexed transport streams are output to the stream transmission unit 25. The stream transmitting unit 25 packetizes the two re-multiplexed transport streams and transmits one transport stream to each external decoder device in accordance with a communication system such as IEEE 1394 wired or IEEE 802.11a wireless.

In the above description, the digital encoder sections 19 and 20 are configured to output two transports separately, but this is combined into one digital encoder section and two analog programs are multiplexed. It may be configured to output as one transport stream.

FIG. 3 shows a system configuration diagram of a digital broadcast receiving system of an example of n = 3 and m = 2 corresponding to claim 4 of the third embodiment of the present invention. The digital broadcast receiving system receives digital broadcast. It is composed of a device 5 and a decoder device 3, and among these components, the decoder device 3 has the same configuration as that of FIG. 1 of the first embodiment of the present invention.

Further, the digital broadcast receiving apparatus 5 has three tuner sections 11, a tuner section 12, a tuner section 13, and three tuner sections 11.
One digital demodulator 14, digital demodulator 15, digital demodulator 16, two stream remultiplexers 23, stream remultiplexer 24, stream transmitter 26, descrambler 28, accumulation control stream processor 29, AV
It is composed of a decoder unit 30 and a storage unit 31, and of these components, except for the stream transmission unit 26, the configuration is the same as that of FIG.

The operation of the digital broadcast receiving system configured as described above will be described below.

Since the operation of the decoder device 3 has been described in the first embodiment of the present invention, only the digital broadcast receiving device 5 will be described here. Tuner unit 11, tuner unit 1
2. The tuner unit 13 selects a channel that matches the band of each broadcast wave, and the digital demodulation unit 14, the digital demodulation unit 15, and the digital demodulation unit 16 perform digital demodulation and error correction processing by a method that matches each broadcast wave. And outputs one transport stream from each.

In the stream multiplexing unit 23, in accordance with the request of the storage control-equipped stream processing unit 29, of the three transport streams output from the digital demodulation unit 14, the digital demodulation unit 15 and the digital demodulation unit 16, the storage control unit is provided with storage control. Two required programs are selected and re-multiplexed in the stream processing unit 29, and one re-multiplexed transport stream is output. The descrambler unit 28 descrambles the data, and the storage control stream processing unit 29 extracts the two required programs as compressed video / audio data. One extracted program is stored in the storage unit 31, the storage control-equipped stream processing unit 29 time-shifts and reads it again, and the AV decoder unit 30 combines the video and audio and outputs them to an external television or the like. The other extracted program is stored in the storage unit 31 and back-recorded.

In the stream multiplexer 24, the digital demodulator 1 is operated in accordance with the request of the external decoder device 3.
4. Of the three transport streams output from the digital demodulation unit 15 and the digital demodulation unit 16, two programs necessary for the external decoder device 3 are selected and re-multiplexed,
The re-multiplexed transport streams are output to the stream transmission unit 25. The stream transmitting unit 25 packetizes the two re-multiplexed transport streams, and uses IEEE 1394 wired or IEEE 802.11a.
One transport stream is transmitted to the external decoder device 3 in accordance with the wireless or other communication method.

In the above description, the descrambler unit 28 is provided after the stream re-multiplexing unit 23 in the digital broadcast receiving device 5, and the descrambler unit 3 is provided in the decoder device 3.
3 is provided, the descrambler section may be removed, or the descrambler section may be provided behind the digital demodulation section 14, the digital demodulation section 15, and the digital demodulation section 16 in the digital broadcast receiving apparatus 5. May be.

[0037]

As described above, according to the present invention, there is a one-to-one correspondence for each decoder device (or function) within a tuner device that receives a plurality of channels or within a digital broadcast receiving device.
By providing a stream re-multiplexing unit existing in the above, a plurality of required programs are selected and re-multiplexed according to a request from each decoder device (or function), and each re-multiplexed stream is provided to each decoder device. (Or function)
It is possible to simultaneously process a plurality of programs in each decoder device (or function), and at the same time, by sharing one descrambler unit in each decoder device (function), an inexpensive decoder device can be provided, and easily. The advantage is that it can be expanded to another room.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a tuner device and a digital broadcast receiving system according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram of a tuner device according to an embodiment of the present invention.

FIG. 3 is a system configuration diagram of a digital broadcast receiving system according to an embodiment of the present invention.

FIG. 4 is a system configuration diagram of a conventional digital broadcast receiving device.

[Explanation of symbols]

1, 4 tuner device A few decoders 5 Digital broadcasting receiver 11, 12, 13 tuner section 14, 15, 16 Digital demodulator 17, 18 Analog demodulator 19, 20 Digital encoder section 23, 24 Stream re-multiplexer 25, 26 Stream transmitter

Claims (4)

[Claims] 1. An n (n is an integer of 2 or more) tuner is built in, a signal of a different band is received and demodulated, and only a requested program is selected from n generated streams and replayed. A tuner device that reconfigures m (m is an integer of 1 or more) streams to transmit m streams, and one stream of each of the m streams transmitted from the tuner device. , And decodes multiple programs in the stream into video and audio at the same time, or
A digital broadcast receiving system characterized in that a storage section is provided with m decoder devices for performing record processing. 2. A tuner device selects n signals in different bands in response to a request from each external decoder device, receives n tuner parts, and signals input from the n tuner parts. Is digitally demodulated corresponding to each modulation method and output as a transport stream n
Number of digital demodulation units and n transport streams input from the above n digital demodulation units, a requested program is selected from each transport stream, and the selected plurality of programs are each converted into one transport stream. From m stream remultiplexing units for remultiplexing and outputting to the port stream, and a stream transmitting unit for transmitting m transport streams input from the m stream remultiplexing units to each external decoder device. The digital broadcast receiving system according to claim 1, wherein the digital broadcast receiving system is configured. 3. The tuner device selects n signals in different bands in response to a request from each external decoder device, receives n tuner parts, and signals input from the n tuner parts. Is digitally demodulated corresponding to each modulation method and output as a transport stream n
N digital demodulation units, n analog demodulation units that respectively demodulate the signals input from the n tuner units, and output as analog video / audio signals, and analog input from the n analog demodulation units. N digital encoder units that digitally encode video / audio signals and output as transport streams, n transport streams input from the n digital demodulation units, and input from the n digital encoder units After selecting the digital or analog for each of the above n tuner parts from the selected n transport streams, the program requested from each transport stream among the selected n transport streams And re-multiplex the selected multiple programs into one transport stream each. And a stream transmitting unit for transmitting m transport streams input from the m stream remultiplexing units to respective external decoder devices. The digital broadcast receiving system according to claim 1. 4. An n (n is an integer of 2 or more) tuner is built in, a signal of a different band is received and demodulated, and only a requested program is selected and replayed from the generated n streams. It is reconfigured into multiple m (m is an integer of 1 or more) streams, and only one requested stream among m streams is used to simultaneously display a plurality of programs in the stream.
A digital broadcast receiving apparatus that performs decoding processing or record processing on audio and transmits the remaining (m-1) streams, and (m) transmitted from the digital broadcast receiving apparatus.
-1) A decoder device is provided which receives one requested stream from each stream and decodes a plurality of programs in the stream into video / audio at the same time, or performs record processing in a storage unit (m- 1) A digital broadcast receiving system characterized by being provided.