Stream Synthesizing Unit Encoding Sync Words for Time-Division Multiplexing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

When two transport streams are time-division multiplexed to be transmitted as one stream, the reception side faces challenges in separating the original streams due to the absence of distinct Packet IDs (PIDs) in the combined stream, making it difficult to accurately separate the individual streams.

Innovation Solution

A transmission device that inputs multiple streams, synthesizes them by encoding the typical pattern portions of each packet using intrinsic keys for separation, and performs time-division multiplexing to create a single stream, which can be reliably decoded and separated at the reception side.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple streams are time-division multiplexed to be transmitted as one stream, then transmission efficiency is improved, but the ability to separate original streams at reception deteriorates

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidstream separation accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The invention segments the single multiplexed stream into multiple original streams by inserting unique identification patterns (sync words) into each packet. These segmentation markers enable the reception device to identify and separate packets belonging to different original streams, resolving the contradiction between transmission efficiency and stream separation accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces an intermediary element - the unique identification pattern (sync word) - that mediates between the multiplexed stream and the separation process. This intermediary marker allows the reception device to reliably identify packet boundaries and stream identities without requiring complex separation logic, thus maintaining both transmission efficiency and separation reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If Packet IDs are used for stream separation, then stream identification is simplified, but Packet IDs are absent in time-division multiplexed streams making separation difficult

Engineering Contradiction:

Improvestream identification simplicityVSAvoidPacket ID availability

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

Instead of relying on the original Packet ID system that is lost in time-division multiplexing, the invention creates a copy of identification information in the form of unique sync words inserted into each packet. This copied identification mechanism restores the ability to identify and separate streams without requiring the original Packet ID structure to be preserved through multiplexing.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS9954925B2Transmission device, transmission method, reception device, reception method, program, stream transmission and reception system, and electronic apparatus

Publication Date: 2018.04.24 SATURN LICENSING LLC

AI summary

Provided is a transmission device including a stream input unit configured to input a plurality of streams each constituted of continuous packets, a stream synthesizing unit configured to synthesize the plurality of input streams to obtain one stream, and a stream transmission unit configured to transmit the one obtained stream. The stream synthesizing unit encodes at least a typical pattern portion of each packet of the plurality of streams using keys that are intrinsic to the respective streams for separation of packets of each stream on a reception side, and thereafter performs time-division multiplexing on the packets of the plurality of streams to obtain the one stream.