Vehicle Data Synchronization via Playback Timing Feedback

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Solution Overview

Problem

In vehicles, the transmission and decoding of audiovisual data streams by different processing units can result in asynchronous output of audio and video information, leading to lip-synchronous issues, as the time taken for data transmission and decoding can vary between units.

Innovation Solution

A method where the first processing unit decodes data and transmits playback information, including output time and synchronization details, to the second processing unit, ensuring synchronized output across multiple units by accounting for network transit and processing times, using protocols like IEEE 1722 and PTP for precise timing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If audiovisual data stream is transmitted and decoded by different processing units, then system flexibility and distributed processing capability are improved, but lip synchronization between audio and video output deteriorates

Engineering Contradiction:

Improvedistributed processing capabilityVSAvoidlip synchronization accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The first processing unit transmits playback information including output time to the second processing unit, creating a feedback mechanism that enables the second unit to adjust its decoding and output timing to match the first unit, thereby maintaining lip synchronization across distributed processing units

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Playback information serves as an intermediary carrier that conveys timing synchronization data between the first and second processing units, enabling coordinated operation without requiring direct complex interaction between the units

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If transmission and decoding times are allowed to vary between processing units, then processing efficiency is improved, but output synchronization deteriorates

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidoutput synchronization timing

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The first processing unit determines the output time in advance and transmits this timing information to the second processing unit before actual playback, allowing the second unit to pre-adjust its processing schedule and ensure synchronized output without compromising processing efficiency

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system allows dynamic variation in transmission and decoding times between units while maintaining synchronization through continuous timing adjustment based on the transmitted playback information, enabling both efficiency and synchronization

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP2572463B1Method and device for synchronizing data in a vehicle

Publication Date: 2018.04.18 BAYERISCHE MOTOREN WERKE AG

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AI summary

The invention proposes a method for processing data in a vehicle in which the data are received by a first processing unit via a network; in which the data are decoded by the first processing unit; and in which a piece of reproduction information comprising an output time or a piece of synchronization information is transmitted to the second processing unit. In addition, an appropriate apparatus is specified.