Storage digital broadcasting apparatus and storage digital broadcasting receiver

• US 20030070172A1
• Filed: 09/09/2002
• Published: 04/10/2003
• Est. Priority Date: 01/18/2001
• Status: Abandoned Application

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Matsuzaki, Kazuhrio, Kato, Yoshiaki
• Application Number:
  US10/221,104
• Publication Number:
  US 20030070172A1
• Time in Patent Office: Days
• US Class Current: 725/87
• CPC Class Codes: H04H 20/38 Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast
• CPC Class Codes: H04H 20/76 Wired systems
• CPC Class Codes: H04H 60/11 Arrangements for counter-measures when a portion of broadcast information is unavailable
• CPC Class Codes: H04H 60/12 wherein another information is substituted for the portion of broadcast information
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/25816 involving client authentication restricting access to computer systems by authenticating users using a predetermined code G06F21/33; cryptographic authentication protocols H04L9/32; networks authentication protocols H04L63/08; authentication in wireless network security H04W12/06
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/44209 Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896
• CPC Class Codes: H04N 21/4623 Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/6375 for requesting retransmission , e.g. of data packets lost or corrupted during transmission from serverARQ protocols H04L1/18; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04N 21/6377 directed to server one-way streaming services wherein the source is controlled by the destination H04L65/613
• CPC Class Codes: H04N 21/658 Transmission by the client directed to the server
• CPC Class Codes: H04N 7/173 with two-way working, e.g. subscriber sending a programme selection signal

Abstract

A stored type digital broadcasting receiver includes a channel decoding unit (43r) that detects apart of broadcasting contents which cannot be received correctly because of an transmission path error from the received broadcasting contents based on results of Viterbi decoding or error correction processing. When the channel decoding unit (43r) detects a transmission path error which cannot be corrected, the stored type digital broadcasting receiver makes a request of a broadcast service provider for the transmission of a complement to the received broadcasting contents. When receiving the requested complement to the broadcasting contents from the broadcast service provider, the stored type digital broadcasting receiver refers to identification information (d13) of an FEC frame (d10) included in the complement to the broadcasting contents and writes the complement to the broadcasting contents over a corresponding file stored in a storage medium of a received bitstream storing and reproducing unit (30rd), or creates a new file and stores the complement to the broadcasting contents in the new file.

Claims

1. A stored type digital broadcasting transmitter for transmitting broadcasting contents stored therein, characterized in that said transmitter comprises:

a means for receiving a request for retransmission of broadcasting contents from a viewer;

a means for identifying the viewer who made the request for the retransmission of the broadcasting contents; and

a means for transmitting the broadcasting contents which have been requested for the retransmission to the viewer.

2. The stored type digital broadcasting transmitter according to claim 1, characterized in that said stored type digital broadcasting transmitter transmits the broadcasting contents, which have been requested for the retransmission by the viewer, to the viewer by using a data broadcasting channel.

3. The stored type digital broadcasting transmitter according to claim 1, characterized in that said stored type digital broadcasting transmitter transmits the broadcasting contents, which have been requested for the retransmission by the viewer, to the viewer by storing the broadcasting contents in an EMM (entitlement management message).

4. The stored type digital broadcasting transmitter according to claim 1, characterized in that said stored type digital broadcasting transmitter transmits the broadcasting contents, which have been requested by the viewer so that they are retransmitted, to the viewer by way of a cable transmission line.

5. The stored type digital broadcasting transmitter according to claim 1, characterized in that said stored type digital broadcasting transmitter receives a request for the retransmission of the broadcasting contents from the viewer as well as identification information on identification of the viewer, and then transmits the broadcasting contents, which have been requested for the retransmission, to the viewer according to the identification information.

6. The stored type digital broadcasting transmitter according to claim 1, characterized. in that when transmitting the broadcasting contents, said stored type digital broadcasting transmitter adds identification information used for identifying either each error correction frame or each error detection frame, or each frame which is constructed when transmitting the broadcasting contents, to the target to be identified.

7. The stored type digital broadcasting transmitter according to claim 1, characterized in that said stored type digital broadcasting transmitter broadcasts the broadcasting contents having time information added thereto, receives a request for the retransmission of the broadcasting contents specified by the viewer using time information, and retransmits a specified part of the broadcasting contents to the viewer.

8. The stored type digital broadcasting transmitter according to claim 1, characterized in that said stored type digital broadcasting transmitter stores digital broadcasting contents defined by an MPEG-2 system standard in PES packets, multiplexes the PES packets into a transport stream so as to transmit the transport stream, and retransmits predetermined PES packets in response to a request for the retransmission of the broadcasting contents from a viewer.

9. The stored type digital broadcasting transmitter according to claim 1, characterized in that said stored type digital broadcasting transmitter multiplexes and transmits digital broadcasting contents by using a transport stream defined by an MPEG-2 system standard, and retransmits transport packets specified by a PCR (program clock reference) value in response to a request for the retransmission of the broadcasting contents from a viewer.

10. A stored type digital broadcasting receiver for storing and reproducing a broadcast program, characterized in that said stored type digital broadcasting receiver comprises:

a means for detecting a part of broadcasting contents which cannot be received correctly because of a transmission path error; and

a means for making a request of a digital broadcasting service provider for the retransmission of the broadcasting contents which cannot be received correctly, and characterized in that said stored type digital broadcasting receiver reproduces the broadcasting contents from which an influence of the transmission path error is removed by receiving and storing a complement to the broadcasting contents which is sent from the digital broadcasting service provider.

11. The stored type digital broadcasting receiver according to claim 10, characterized in that said stored type digital broadcasting receiver automatically detects an invalid data portion in the received broadcasting contents based on an error correction result or error detection result, which is obtained during channel decoding, and delivers either an FEC (forward error correction) frame or CRC (cyclic redundancy check) frame including the invalid data portion or a frame which is constructed when transmitted to the digital broadcasting service provider so as to make a request for the retransmission of the complement to the broadcasting contents.

12. The stored type digital broadcasting receiver according to claim 10, characterized in that said stored type. digital broadcasting receiver automatically detects an invalid data portion in the received broadcasting contents based on an error correction result or error detection result, which is obtained when demultiplexing the received broadcasting contents into plural pieces of media information.

13. The stored type digital broadcasting receiver according to claim 10, characterized in that said stored type digital broadcasting receiver receives the complement to the broadcasting contents by way of a data broadcasting channel.

14. The stored type digital broadcasting receiver according to claim 10, characterized in that said stored type digital broadcasting receiver receives the complement to the broadcasting contents by way of a line interface with a public network.

15. The stored type digital broadcasting receiver. according to claim 10, characterized in that when detecting an invalid data portion from the received broadcasting contents, said stored type digital broadcasting receiver makes a request of the digital broadcasting service provider for the retransmission of the missing portion of the broadcasting contents while adding viewer identification information to the request.

16. The stored type digital broadcasting receiver according to claim 10, characterized in that said stored type digital broadcasting receiver receives broadcasting contents having time information added thereto, and, when detecting an invalid data portion from the received broadcasting contents, makes a request of the digital broadcasting service provider for the retransmission of the missing portion of the broadcasting contents while adding time information associated with the error detected portion to the request.

17. The stored type digital broadcasting receiver according to claim 10, characterized in that in a stored type digital broadcasting service by which digital broadcasting contents are multiplexed and transmitted by using a transport stream defined by an MPEG-2 system standard, when detecting a transmission path error in the received broadcasting contents, as for a media stream to which PTSs (presentation time stamps) are added when PES packetized, said stored type digital broadcasting receiver makes a request for the retransmission of a part of the media stream corresponding to a series of PES packets including a PES packet carrying a PTS generated immediately before appearance of the error through another PES packet carrying a PTS generated immediately behind disappearance of the error.

18. The stored type digital broadcasting receiver according to claim 10, characterized in that in a stored type digital broadcasting service by which digital broadcasting contents are multiplexed and transmitted by using a transport stream defined by an MPEG-2 system standard, when detecting a transmission path error in the received broadcasting contents, said stored type digital broadcasting receiver makes a request for the retransmission of a part of the received broadcasting contents corresponding to a series of transport packets including a transport packet carrying a PCR (program clock reference) generated immediately before appearance of the error through another transport packet carrying a PCR generated immediately behind disappearance of the error.