Audio Video Recording Apparatus Seamless Connection Method
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Solution Overview
Problem
Conventional audio/video recording and reproducing methods face challenges in seamlessly connecting audio and video data recorded on optical discs, leading to gaps and noise during reproduction due to mismatched frame periods and lack of synchronization.
Innovation Solution
An audio/video recording and reproducing apparatus that performs encoding with a window function multiplying process and orthogonal transformation, adjusts video and audio frame periods for seamless connection, and records management information to synchronize audio and video data, preventing buffer overflow and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If video data and audio data are recorded with different frame periods to optimize各自 encoding efficiency, then encoding efficiency is improved, but seamless connection and reproduction become difficult due to frame period mismatch
Solution Approach 1:
The patent applies preliminary action by pre-calculating and recording management information (GOP period, audio frame period, connection point timing) during the encoding phase. This allows the reproduction apparatus to anticipate and prepare for seamless connection points before actual reproduction, enabling frame period mismatch compensation without real-time complex calculations.
Solution Approach 2:
The patent changes parameters by introducing management information structures that record GOP periods, audio frame periods, and connection point timestamps. These parameter changes enable the reproduction system to dynamically adjust playback timing based on the recorded metadata, achieving seamless connection despite different encoding frame periods.
2Adaptability or versatility
If audio frames are connected at arbitrary connection points in video objects, then reproduction flexibility is improved, but gaps and noise occur due to asynchronization between audio and video frames
Solution Approach 1:
The patent implements feedback by recording management information that includes connection point timestamps and frame period data. The reproduction apparatus uses this feedback information to calculate appropriate PTS offsets and adjust audio playback timing, ensuring synchronized connection at arbitrary points without gaps or noise.
Solution Approach 2:
The patent introduces management information as an intermediary between video and audio streams. This intermediary structure contains synchronization data that mediates the connection between audio and video frames with different period structures, enabling flexible splicing while maintaining synchronization.
3Manufacturing precision
If video frames are seamlessly connected by resetting system time clock, then video connection quality is improved, but audio-visual synchronization deviations occur due to clock reset
Solution Approach 1:
The patent applies preliminary action by pre-calculating PTS offsets for audio frames at connection points based on the video GOP structure and audio frame period recorded in management information. This allows audio synchronization to be maintained across clock resets without real-time adjustment complexity.
4Productivity
If audio and video data are multiplexed with different frame periods, then data compression efficiency is improved, but buffer overflow risks increase during reproduction
Solution Approach 1:
The patent applies preliminary action by recording management information that includes GOP periods and audio frame periods during encoding. This allows the reproduction apparatus to pre-calculate buffer requirements and PTS offsets, enabling efficient buffer management that prevents overflow while maintaining compression efficiency.
Data Source
AI summary
At the time of recording, only an edition point is recorded (step S4). At the time of reproduction, overlap time (A_overlap) between an audio frame to be reproduced last and an audio frame to be reproduced first, each including a video connection point is calculated and, further, offset time is calculated on the basis of the overlap time (step S12). Reproducing audio data by using the calculated offset time (step S14) enables reproduction be performed without a gap between audio frames around a connection point. Around connection points, by performing a window function multiplying process on audio data, audio samples are seamlessly connected to each other.