Digital Video Receiver Synchronization Using Preliminary Parameter Sets

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Solution Overview

Problem

Conventional digital video broadcasting systems face delays in decoding and demodulation due to the slow process of synchronizing with transmission parameter blocks, which can take up to 150 ms or more, affecting the timely recovery of digital video signals.

Innovation Solution

A method that involves providing an initial set of video transmission parameters, matching bits of the transmission parameter signal to a predetermined pattern to find synchronization blocks, and updating these parameters with decoded information, allowing for faster synchronization and decoding of digital video signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If conventional synchronization methods are used to synchronize with transmission parameter blocks, then accurate parameter recovery is achieved, but synchronization time exceeds 150 ms

Engineering Contradiction:

Improvesynchronization timeVSAvoidparameter recovery accuracy

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The system performs preliminary actions by using preliminary parameter sets and prediction mechanisms to enable decoding before complete synchronization is achieved. The receiver can start decoding using predicted parameters and then update them once synchronization is completed, thereby reducing the effective time loss during synchronization.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the parameter sets based on synchronization status. It maintains multiple parameter sets (e.g., first and second parameter sets) and switches between them depending on whether the receiver is in synchronization or resynchronization mode, allowing flexible adaptation to different operational states and reducing overall synchronization time.

Inventive Principle:

Principle #15Dynamics

2Productivity

If complete transmission parameter blocks are decoded before starting video decoding, then parameter accuracy is ensured, but video decoding is delayed

Engineering Contradiction:

Improvevideo decoding speedVSAvoidparameter decoding accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system applies preliminary action by initiating video decoding before complete parameter blocks are received. It uses preliminary parameter sets to start the decoding process and then updates the parameters as they become available, ensuring both speed and accuracy are achieved without waiting for complete parameter decoding.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses partial parameter sets to enable decoding operation. Instead of waiting for complete parameter blocks, it utilizes available partial parameters (such as modulation scheme and code rate) to perform video decoding, and then refines the parameters as more information becomes available, achieving productive early decoding.

Inventive Principle:

Principle #16Partial or excessive action

3Speed

If transmission parameters are updated frequently during signal acquisition, then adaptation speed increases, but processing complexity increases

Engineering Contradiction:

Improveparameter update speedVSAvoidprocessing complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The system dynamically manages parameter updates by differentiating between operational modes (synchronization vs. resynchronization). During synchronization, it uses a limited set of parameters to reduce processing complexity, while during resynchronization, it updates parameters more frequently. This dynamic approach balances speed and complexity based on actual operational needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes parameters based on operational state, maintaining simpler parameter sets during initial synchronization and expanding to more comprehensive parameter updates during resynchronization. This selective parameter management reduces processing complexity while maintaining adequate update speed for each operational phase.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8208533B2Methods and apparatus for fast signal acquisition in a digital video receiver

Publication Date: 2012.06.26 MEDIATEK INC

AI summary

Methods and systems for receiving, processing and/or decoding digital video signal and acquisition of transmission parameters encoded therein. The method generally includes providing an initial set of parameters for decoding the digital video signal, finding a synchronization block position by matching bits of the transmission parameter signal to a predetermined pattern, obtaining raw transmission parameter bits from the transmission parameter signal based on the synchronization block position, storing the raw transmission parameter bits, and updating at least one of the initial set of parameters with at least one updated transmission parameter value from the raw transmission parameter bits. Embodiments of present invention advantageously provide a faster approach for synchronizing with the frame boundaries of transmission parameter blocks to decode digital video signals.