METHOD FOR ARRANGING ZAPPING STREAMS IN MPE-FEC FRAME AND RECEIVER
In the invention, zapping streams respectively relating to a plurality of normal service are set in one burst, and the burst is transmitted as a zapping burst. The zapping burst is transmitted in a cycle of one second or less. A PID dedicated to a zapping burst is added to the zapping burst. Association between the zapping burst and the normal service is designated by an IP source address, an IP destination address, or a port number. The transmission performed in this manner make it possible to perform a zapping process without considerably changing an IP encapsulator on a transmission side and an existing receiver.
1 . A burst transmitting method in which burst transmission of compressing and transmitting contents of each of services in a short time period at a transmission rate sufficiently higher than a reproduction rate of the contents of each service is performed, the method comprising:
concentrating data relating to the each service as zapping data;
arranging the zapping data in a burst for zapping; and
transmitting the burst as zapping burst.
2 . The burst transmitting method according to claim 1 ,
wherein a transmission frame of the zapping burst constitutes a zapping MPE-FEC frame, the zapping MPE-FEC frame is constituted by a zapping application data table and a zapping RS data table, and
wherein the zapping application data table is buried with a zapping IP datagram, and the zapping IP datagram carries a zapping stream.
3 . The transmitting method according to claim 2 , further comprising:
calculating redundant data for error correction for the normal stream from the table in which the normal stream is arranged;
arranging the calculated redundant data of the normal stream in a data table for error correction data;
calculating redundant data for error correction for the zapping stream from a table in which the zapping stream is arranged; and
arranging the calculated redundant data for zapping in a second data table for error correction data.
4 . The transmitting method according to claim 1 , further comprising:
arranging zapping streams corresponding to a plurality of normal services in one frame for zapping; and
setting the zapping stream in a unique PID different from that of a TS of the normal service to transmit.
5 . The transmitting method according to claim 1 , further comprising:
setting a value such as “no power off” or “10 ms” as small as possible in a Δt field representing a burst interval of the zapping service.
6 . The transmitting method according to claim 4 , further comprising:
designating a specific zapping stream extracted from all the zapping streams in the same frame for zapping by an IP source address, an IP destination address, or a port number.
7 . The transmitting method according to claim 4 , further comprising:
designating an association between the stream for zapping in the frame for zapping and a normal service related thereto by an IP source address, an IP destination address, or a port number.
8 . A receiver which receives a signal transmitted by multiplexing and transmitting a plurality of normal streams and zapping streams relating to the plurality of normal stream that are compressed and burst-transmitted in a short time period at a transmission rate sufficiently higher than a reproduction rate of the contents of each service is performed, the receiver comprising:
a first set, which are used for processing the normal stream, comprising:
a first section filter/buffer unit;
a first CRC-32 or a checksum calculating unit;
a first MPE-decapsulator unit;
a first MPE-FEC frame unit; and
a first reliability frame unit; and
a second set, which are used for processing a stream for zapping operated in parallel to the normal stream, comprising:
a second section filter/buffer unit;
a second CRC-32 or checksum calculating unit;
a second MPE-decapsulator unit;
a second MPE-FEC frame unit; and
a second reliability frame unit.
9 . A receiver which receives a signal transmitted by multiplexing and transmitting a plurality of normal streams and zapping streams relating to the plurality of normal stream that are compressed and burst-transmitted in a short time period at a transmission rate sufficiently higher than a reproduction rate of the contents of each service is performed, the receiver comprising:
a first set, which are used for processing the normal stream, comprising:
a first section filter/buffer unit;
a first CRC-32 or a checksum calculating unit;
a first MPE-decapsulator unit;
a first MPE-FEC frame unit; and
a first reliability frame unit,
a second set, which are used for processing a stream for zapping operated in parallel to the normal stream, comprising:
a second section filter/buffer unit;
a second CRC-32 or checksum calculating unit;
a second MPE-decapsulator unit;
a second MPE-FEC frame unit; and
a second reliability frame unit,
a firmware for executing the second set to process a stream for zapping.
10 . The receiver according to claim 8 , which receives a signal transmitted by multiplexing and transmitting a plurality of normal streams and zapping streams relating to the plurality of normal stream that are compressed and burst-transmitted in a short time period at a transmission rate sufficiently higher than a reproduction rate of the contents of each service is performed, further comprising:
a storing unit operable to store the normal streams in a buffer;
a detecting unit operable to detect that preparation for outputting from the buffer is completed; and
an interrupting unit operable to interrupt a process of zapping stream when it is detected that the preparation for outputting is completed.
11 . The receiver according to claim 8 , further comprising:
a storing unit operable to store the zapping streams; and
a showing unit operable to show all or some of the stored zapping streams depending on a request from a user.
12 . A receiver which receives a signal transmitted by multiplexing and transmitting a plurality of normal streams and zapping streams relating to the plurality of normal stream that are compressed and burst-transmitted in a short time period at a transmission rate sufficiently higher than a reproduction rate of the contents of each service is performed, comprising:
a first section filter/buffer unit;
a first CRC-32 or a checksum calculating unit;
a first MPE-decapsulator unit;
a first MPE-FEC frame unit; and
a first reliability frame unit,
wherein each unit are commonly used in a process for the normal streams and a process for the zapping streams.
13 . The receiver according to claim 9 , which receives a signal transmitted by multiplexing and transmitting a plurality of normal streams and zapping streams relating to the plurality of normal stream that are compressed and burst-transmitted in a short time period at a transmission rate sufficiently higher than a reproduction rate of the contents of each service is performed, further comprising:
a storing unit operable to store the normal streams in a buffer;
a detecting unit operable to detect that preparation for outputting from the buffer is completed; and
an interrupting unit operable to interrupt a process of zapping stream when it is detected that the preparation for outputting is completed.
14 . The receiver according to claim 9 , further comprising:
a storing unit operable to store the zapping streams; and
a showing unit operable to show all or some of the stored zapping streams depending on a request from a user.