Reception Apparatus Network Delay Compensation
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Solution Overview
Problem
Existing technologies face challenges in achieving initial synchronization of media data presentation across networks without relying on fluctuations in transmission packet delay times, leading to issues like buffer underflow and overflow, which degrade media presentation quality.
Innovation Solution
A reception apparatus and system that receive IP packets with multiplexed transport packets containing media data, using a presentation controller to control presentation timing based on network delay time, achieved through time-of-day synchronization using protocols like PTP, ensuring synchronized media presentation across multiple receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If presentation timing is controlled based on packet arrival time without network delay compensation, then the system is simpler to operate, but initial synchronization cannot be achieved and buffer underflow/overflow occurs
Solution Approach 1:
The patent applies preliminary action by measuring the network delay time in advance through time-of-day synchronization between transmission and reception apparatus. This pre-measured delay information is then used to compensate for packet transfer delays, enabling accurate presentation timing without requiring complex real-time adjustments during media playback
Solution Approach 2:
The patent implements feedback by using time-of-day synchronization to continuously monitor and measure network delay time. This feedback mechanism provides real-time delay information that the presentation controller uses to adjust presentation timing dynamically, ensuring synchronized playback despite network fluctuations
2Reliability
If buffer size is increased to prevent underflow, then reliability improves, but latency increases and memory usage increases
Solution Approach 1:
The patent replaces the mechanical buffer-based delay compensation mechanism with a timing-based control system. Instead of using large buffers to absorb network delay variations, the system uses measured network delay time to calculate and apply precise presentation timing adjustments, thereby achieving reliability without increasing latency or memory requirements
3Device complexity
If network delay time is not compensated, then device complexity is reduced, but media presentation quality deteriorates due to desynchronization
Solution Approach 1:
The patent applies parameter changes by measuring network delay time as a key parameter and using this parameter to dynamically adjust presentation timing. The system changes the presentation time parameter based on the measured network delay, ensuring that media data is presented at the correct time despite variations in network transmission conditions
Data Source
AI summary
Initial synchronization is achieved without depending on fluctuations of a transmission packet transfer delay time in a network.An IP packet having a multiplexed transport packet containing media data is received via a network. The IP packet is processed, and media presentation by the media data is controlled. A presentation timing is controlled on the basis of a network delay time in communication between a transmission side and a reception apparatus via the network. For example, the multiplexed transport packet is a TS packet making up an MPEG-2 transport stream.