Divicom Inc.

Divicon, Inc.

Nolan Daines

Brian W Johnson

Mark Magee

Tom Lookabaugh

Stephen How

Tom Ayers

Mike Perkins

Emanuel Washington

Keith Vertrees

A remultiplexer is disclosed for communicating plural programs. Each program comprises one or more elementary streams that are encoded in relation to a single common time base corresponding to the respective program. The communicated programs originate from plural input transport streams that each comprises plural transport packets. Each transport packet contains a packet identifier indicating the data contained therein. Within each transport stream, unique packet identifiers are assigned to each elementary stream of each program. The data of each elementary stream is only contained in transport packets having a corresponding packet identifier. Each input transport stream contains time stamps for reconstructing the single program time base corresponding to each program conveyed therein. The remultiplexer has a data link module which receives the plural input transport streams. The data link module also selectively extracts transport packets from the received input transport streams. The remultiplexer has a downstream bus on which the data link module sequentially transfers at least some of the extracted transport packets. The remultiplexer selects which of the extracted transport packets to transfer on the downstream message bus depending on the packet identifiers of the transport packets. The remultiplexer also has a scheduler which assembles the transport packets transferred on the downstream bus into a single output transport stream.

MPEG transport stream remultiplexer

A transport stream decoder/demultiplexer is provided which includes a program clock recovery circuit for recovering a program clock from program clock reference (PCR) values contained in selected transport packets. A processor is provided for extracting elementary stream data from transport packets labeled with packet identification codes (PIDs) that are specified by a host processor. The processor separately stores the elementary stream data of each stream. A host processor interface is also provided for transferring data between an external host processor and the program clock recovery circuit. A memory manager may be provided for storing the data extracted by the processor for each elementary stream in a corresponding queue. The queues may be maintained by the memory manager in an external RAM. A descrambler interface may be provided for transferring scrambled data and data derived from conditional access information between the processor and an external descrambler. In addition, at least one elementary stream interface, such as a video interface or audio interface, may be provided for outputting extracted elementary stream data for a particular elementary stream from a corresponding queue. Furthermore, a high speed interface may be provided for outputting transport packet data prior to data extraction by the processor.

Transport stream decoder/demultiplexer for hierarchically organized

Growing community of inventors

Fremont, CA, United States of America

Nolan Daines