Broadcast Transmission Device Clock Synchronization Fragmentation

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Solution Overview

Problem

There is a growing need for standardization and integration of delivery specifications between broadcasting and communication, particularly in achieving clock synchronization and presentation synchronization when transmitting fragmented video and audio media packets over broadcast signals.

Innovation Solution

A transmission device and reception device are designed to generate and synchronize clocks with time information from a time information server, fragmenting media into packets that include time information and control signals, allowing for clock and presentation synchronization by transmitting these packets on a broadcast wave, using components like clock generation units, time information generation units, encoding units, and packetizers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If transmission media packets are fragmented and transmitted on broadcast signals, then delivery integration between broadcasting and communication is achieved, but clock synchronization and presentation synchronization become difficult to maintain

Engineering Contradiction:

Improvedelivery integrationVSAvoidsynchronization accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The transmission medium is divided into multiple transmission media packets, each containing fragmented media data along with embedded time information and control signals. This segmentation enables broadcast delivery of communication-based media while maintaining synchronization through distributed timing data in each packet segment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Time information packets and control signal packets act as intermediaries between the broadcast transmission channel and the receiving device. These intermediary packets carry synchronization data that mediates the relationship between fragmented media packets and the receiver's clock, enabling accurate reconstruction and playback timing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If time information is embedded in each transmission media packet, then synchronization accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidpacket structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The transmission packet structure is designed to serve multiple functions simultaneously: it carries fragmented media data, embedded time information for synchronization, and control signals for playback management. This multi-functionality reduces the need for separate synchronization channels and simplifies the overall system architecture.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Time information and control signals are merged directly into the transmission media packet structure rather than being transmitted through separate channels. This consolidation simplifies the packetization process and reduces the number of separate transmission streams required, thereby reducing device complexity while maintaining synchronization accuracy.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10231007B2Transmission device, transmitting method, reception device, and receiving method

Publication Date: 2019.03.12 SATURN LICENSING LLC

AI summary

Clock synchronization and presentation synchronization are appropriately achieved in the case where transmission is performed by carrying, on a broadcast signal, a transmission media packet obtained by fragmenting transmission media such as video and audio.A clock of 27 MHz synchronized with time information acquired from a time information server is generated. Time information including frequency information of the clock of 27 MHz and synchronized with the time information acquired from the time information server is generated. A transmission medium is encoded. The encoded transmission medium is fragmented in a predetermined unit, and a transmission media packet including each fragment is generated. A stream that includes, on time division basis, the transmission media packet, a packet including the time information, and a packet having a control signal is carried on a broadcast wave and transmitted.