Variable Burst Signal Transmission Frame Synchronization
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Solution Overview
Problem
Existing transmission apparatuses face challenges in maintaining high-quality video or audio streaming due to fluctuations in data input period and clock frequency deviations, leading to data loss or frame discontinuity, and require large buffer memory capacities to prevent overflow or underflow during external device switching, resulting in unnecessary transmission delays.
Innovation Solution
The technique involves a transmission method and apparatus that adjusts the length of a burst signal portion within a transmission frame to match fluctuations in the data input period, reducing the necessary buffer memory capacity and minimizing transmission delays while maintaining transmission quality, even during operation mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer memory with large capacity is used to prevent overflow or underflow during external device switching, then the reliability of data transmission is improved, but the transmission delay increases
Solution Approach 1:
The patent applies dynamics by making the buffer memory capacity adjustable rather than fixed. The transmission apparatus dynamically changes the buffer capacity based on the operational state (normal operation vs. external device switching), allowing the system to use minimal buffer space during normal operation and expand only when needed during switching transitions, thus resolving the contradiction between reliability and transmission delay
Solution Approach 2:
The patent applies preliminary action by preparing the buffer memory in advance during normal operation with a minimal capacity setting. When external device switching is detected, the system has already positioned data in the buffer and is in the process of changing the buffer capacity to accommodate the switching requirement, thereby preventing overflow or underflow without requiring the buffer to be constantly oversized
2Reliability
If the buffer memory capacity is increased to accommodate data fluctuations during external device switching, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the buffer memory capacity parameter dynamically based on operational conditions. The transmission apparatus changes the buffer capacity parameter from a minimal value during normal operation to a larger value when external device switching is required, thereby preventing data overflow or underflow without permanently increasing device complexity
Solution Approach 2:
The patent applies the intermediary principle by introducing a control mechanism that mediates between the data input apparatus and the buffer memory. This control mechanism (the transmission apparatus) monitors operational states and adjusts buffer capacity accordingly, acting as an intermediary that simplifies the overall system management by centralizing the buffer configuration decisions
Data Source
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AI summary
A burst signal generator (104) generates a burst signal that is a variable length portion whose length changes in accordance with fluctuations in data input at a predetermined period. An OFDM modulator (102) generates an OFDM signal (including a guard interval portion and an effective symbol portion) that is a fixed length portion containing data corresponding to n (n is a positive integer) times or 1/n of the predetermined period. A frame includes the variable length portion and the fixed length portion. This makes a transmission signal (TX) actually have a frame period almost equal to the period of a signal (WS) synchronized with the clock of a player, including the fluctuations.