Time Shifter and Tone Adapter for Video-Audio Synchronization
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Solution Overview
Problem
Current packet switched infrastructure for video stream transmission faces limitations in processing and buffering capabilities of recipient devices, leading to issues like packet loss, delay, and synchronization problems between audio and video data, resulting in poor video quality and synchronization issues.
Innovation Solution
The implementation of a video quality adapter and time shifter/tone adapter system that dynamically adjusts frame rates, pixel and color resolutions, and applies compensative sound effects to maintain synchronization and quality, even during packet loss or frame drops, by identifying dropped frames and performing gradual frequency shifts to minimize disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If video streams are compressed and packetized for Internet transmission, then bandwidth efficiency is improved, but packet loss and delay occur leading to poor video quality
Solution Approach 1:
The system performs preliminary actions by creating multiple reference frames and storing them in advance before transmission. When packets are lost during transmission, the recipient device can use these pre-prepared reference frames to reconstruct missing video frames without requiring the original packets, thus maintaining video quality despite bandwidth constraints and packet loss.
Solution Approach 2:
The system provides beforehand cushioning by generating and storing multiple reference frames that serve as backup data. These reference frames act as a cushion against packet loss, allowing the recipient device to recover from transmission errors without significant quality degradation, effectively protecting against the unreliable nature of Internet transmission.
2Ease of operation
If recipient devices perform decoding and reassembly of video packets, then video playback is enabled, but processing and buffering capability limitations cause synchronization issues and frame skipping
Solution Approach 1:
The system introduces an intermediary approach by using reference frames as a mediator between the transmitted video packets and the final decoded output. When packets are lost or delayed, the reference frames serve as a substitute that allows the decoding process to continue smoothly without synchronization issues, reducing the processing burden on recipient devices while maintaining reliable playback.
Solution Approach 2:
The system applies parameter changes by dynamically adjusting the use of reference frames based on transmission conditions. When packet loss is detected, the system changes the decoding parameters to rely more heavily on reference frames rather than missing packets, thereby maintaining synchronization and reducing the complexity of real-time processing at the recipient device.
3Quantity of substance
If audio and video packets are transmitted separately, then bandwidth utilization is improved, but synchronization between audio and video is lost when packets are delayed or lost
Solution Approach 1:
The system implements feedback mechanisms by continuously monitoring the arrival status of video packets and comparing it against the reference frames. When packet loss or delay is detected, the system provides feedback to adjust the synchronization of audio and video playback, using the reference frames as a stable reference point to maintain proper timing relationships despite separate transmission of audio and video streams.
Data Source
AI summary
A digital electronic device includes a time shifter/tone adapter that eliminates unwanted audio effects at recipient device, that includes stutter and loss of audio synchronization, as a result of video quality adaptation (the video quality adapter varies frame rate, pixel and color resolutions without having a discernable difference in picture quality, that is, drops many frames in every frame set). The tone adaptation involves gradual frequency shifting, that is, gradual up shifting until synchronization with video is obtained (time shifting), then gradual down shifting. The recipient device (or a set top box) may contain a time shifter/tone adapter that eliminates unwanted audio effects at the recipient devices that may include stutter and loss of audio synchronization, as a result of loss of packets in channel.