Packet multiplexing system

• US 6,014,368 A
• Filed: 03/10/1997
• Issued: 01/11/2000
• Est. Priority Date: 03/11/1996
• Status: Expired due to Term

• Current Assignee: Hanger Solutions, LLC (IP Investments Group LLC)
• Original Assignee: OKI Electric Industry Company Limited
• Inventors: Sanami, Jun
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US08/813,306
• Time in Patent Office: 1,037 Days
• Field of Search: 370/242, 370/244, 370/249, 370/389, 370/470, 370/471, 370/474, 348/461, 348/466, 348/467, 348/469, 348/487, 348/423, 348/441, 714/798, 714/799, 714/819, 714/820, 714/821, 714/824
• US Class Current: 370/242
• CPC Class Codes: H04N 21/236 Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream multiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00

Abstract

A multiplexing system which detects multiplexing errors, includes PES packetizing modules that packetize elementary streams (ES) to produce packetized elementary streams (PES), and a TS/PS packetizing module that multiplexes packetized elementary streams (PES) to produce transport streams (TS) or program streams (PS). Comparators are provided each to compare a non-packetized elementary stream (ES) or a packetized elementary stream (PES) stored in a FIFO memory with the packetized elementary stream (ES) or packetized elementary stream (PES) from the packetizing modules. Based on the comparison result, a control module detects errors in the packetizing modules.

Claims

1. A packet multiplexing system, comprising:

a plurality of input data packetizing modules for packetizing input data;

an output data packetizing module for multiplexing and packetizing data output from the input data packetizing modules, and outputting the multiplexed and packetized data as output data;

a plurality of comparators corresponding respectively to each of the input data packetizing modules, for comparing the output from the input data packetizing modules and the output data; and

a plurality of memories, corresponding respectively to each of the input data packetizing modules, each of the memories for delaying the data output from the input data packetizing module to which the memory corresponds, by a time equal to the sum of a time required by the input data packetizing module to create a header of the packetized input data and a time required by the output data packetizing module to packetize the output from the input data packetizing modules.

2. A packet multiplexing system according to claim 1, wherein each of the memories is a first in-first out memory.

3. A packet multiplexing system, comprising:

a plurality of input data packetizing modules for packetizing input data;

an output data packetizing module for multiplexing and packetizing data output from the input data packetizing modules, and outputting the multiplexed and packetized data as output data, wherein each input data packetizing module is a PES packetizing module that packetizes an elementary stream and the output data packetizing module is a TS/PS packetizing module generates a transport stream or a program stream from data output by each of the input data packetizing modules; and

a plurality of comparators corresponding respectively to each of the input data packetizing modules, for comparing the output from the input data packetizing modules and the output data.

4. A packet multiplexing system according to claim 3, wherein the PES packetizing modules output the packetized input data as respective individual non-multiplexed elementary streams and the comparators compare the individual elementary streams output by the PES packetizing modules with the respective multiplexed packetized elementary streams output by the TS/PS packetizing module.

5. A packet multiplexing system according to claim 3, further comprising a plurality of memories, corresponding respectively to each of the PES packetizing modules, wherein the PES packetizing modules output the packetized input data as respective individual non-multiplexed packetized elementary streams, wherein each of the memories temporarily store and thereby delay the non-multiplexed packetized elementary stream output from the PES packetizing module to which the memory corresponds, for a time equal to the sum of a time required by the PES packetizing module to create a header of the PES stream and a time required by the TS/PS packetizing module to multiplex the PES streams output from the PES packetizing modules, and each comparator extracts a part of the transport stream or program stream output by the TS/PS packetizing module corresponding to the packetized elementary stream and compares said part with the individual non-multiplexed packetized elementary stream stored in the memory corresponding to the PES packetizing module.

6. A packet multiplexing system, comprising:

a plurality of input data packetizing modules for packetizing non-packetized input data;

an output data packetizing module for multiplexing and packetizing data output from the input data packetizing modules, and outputting the multiplexed and packetized data as output data;

a first plurality of comparators corresponding respectively to each of the input data packetizing modules, for comparing the output from the input data packetizing modules and the output data; and

a second plurality of comparators, corresponding respectively to each of the input data packetizing modules, each of the second plurality of comparators for comparing the non-packetized input data input thereto to the packetized data output therefrom, and checking for errors in the packetized data.

7. A packet multiplexing system, comprising:

a first multiplexing module and a second multiplexing module, each for in parallel packetizing and multiplexing a same plurality of non-packetized data streams, wherein

the first multiplexing module includes first input data packetizing modules for receiving and packetizing the non-packetized data streams to obtain first packetized data streams, and first comparators for comparing the non-packetized data streams prior to packetizing and the first packetized data streams, and

the second multiplexing module includes second input data packetizing modules for packetizing the non-packetized data streams to obtain second packetized data streams, and second comparators for comparing the non-packetized data streams and the second packetized data streams;

first and second checking control modules that receive results of the comparing respectively by the first and second comparators, and error check the results for errors in the first and second packetized data streams; and

a selection control module that receives error checking results from the checking control modules, and that selects one of the first and second multiplexing modules based on the received error checking results.

8. A packet multiplexing system according to claim 7, wherein the first checking control modules detect respective numbers of errors in the packetized data streams respectively received by the first and second comparators, and the selection control module selects the one of the first and second multiplexing modules obtaining the packetized data streams with the least number of errors.