Multistream distributor and multi-descrambler
AssigneeMitsubishi Electric Corporation
InventorsHideki Kawano, Hideaki Kosaka
Life of this patent
Estimating the term…
Abstract
A multistream distributor and a multi-descrambler are provided at low cost, which are capable of displaying a plurality of transport streams corresponding respectively to a plurality of channels on a plurality of receivers or the like. Three first scrambled transport streams received via tuners are time-multiplexed by a multiplexer into one second scrambled transport stream. A multi-descrambler descrambles and encrypts each of the three first scrambled transport streams forming one second scrambled transport stream in correspondence with each of receivers.
Claims14
A multistream distributor comprising:
- a multiplexer time-multiplexing a plurality of first scrambled transport streams corresponding respectively to a plurality of receivers into one second scrambled transport stream;
- a multi-descrambler descrambling and encrypting each of said plurality of first scrambled transport streams forming said one second scrambled transport stream in correspondence with each of said plurality of receivers, to generate one second encrypted transport stream consisting of a plurality of first encrypted transport streams;
- and
- a stream transfer interface time-demultiplexing said one second encrypted transport stream into said plurality of first encrypted transport streams and inputting each of said plurality of first encrypted transport streams into a corresponding one of said plurality of receivers.
A multi-descrambler comprising:
- a demultiplexer time-demultiplexing one second scrambled transport stream, which has been obtained by time-multiplexing a plurality of first scrambled transport streams corresponding respectively to a plurality of receivers, into said plurality of first scrambled transport streams;
- a descramble circuit descrambling each of said plurality of first scrambled transport streams in correspondence with each of said plurality of receivers, to generate a plurality of descrambled transport streams;
- a cipher circuit encrypting each of said plurality of descrambled transport streams in correspondence with each of said plurality of receivers, to generate a plurality of first encrypted transport streams;
- and
- a multiplexer time-multiplexing said plurality of first encrypted transport streams into one second encrypted transport stream.
Dependencies are inferred from the claim text.