Audio Output Delay Feedback for Multimedia Playback Synchronization
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Solution Overview
Problem
Synchronizing multimedia playback across different devices, particularly when audio and video are output by separate devices, is challenging due to varying delays introduced by audio output devices, which can lead to desynchronization.
Innovation Solution
A host device communicates with audio output devices to obtain output delay data, uses this data along with host delay data to determine a synchronization delay, and adjusts the playback of video and audio accordingly to ensure synchronized output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If audio data is sent to an external audio output device, then audio output quality is improved, but synchronization between audio and video deteriorates due to unaccounted processing delays
Solution Approach 1:
The audio output device provides feedback about its processing delay characteristics to the host device. The host device uses this feedback information to calculate appropriate synchronization delays, ensuring that audio and video remain synchronized despite the external audio processing pipeline.
Solution Approach 2:
The host device performs preliminary calculations of synchronization delays based on the audio output delay data received from the audio output device. This preliminary action allows the host device to pre-compensate for the audio processing delay, ensuring proper synchronization before playback begins.
2Adaptability or versatility
If video is output locally while audio is sent externally, then device functionality is improved, but synchronization control becomes more difficult
Solution Approach 1:
The host device acts as an intermediary that receives delay information from the external audio output device and uses this information to coordinate the timing of video output. This intermediary role simplifies the synchronization control by centralizing the delay compensation logic in the host device.
Solution Approach 2:
The system dynamically adjusts video playback timing based on real-time or pre-calculated delay characteristics of the external audio output device. This dynamic adaptation allows the system to maintain synchronization across different audio devices and operating conditions without requiring complex manual configuration.
3Adaptability or versatility
If audio processing delay is introduced by external devices, then audio output capability is improved, but playback synchronization accuracy deteriorates
Solution Approach 1:
The system implements a feedback mechanism where the audio output device communicates its processing delay characteristics to the host device. This feedback loop enables the host device to accurately measure and compensate for synchronization deviations, maintaining high synchronization accuracy despite the presence of external audio processing delays.
Data Source
AI summary
A device includes one or more processors configured to obtain output delay data based on a transmission from an audio output device. The output delay data indicates a playback delay associated with audio output by the audio output device. The one or more processors are further configured to determine, based on the output delay data and host delay data, a synchronization delay to coordinate audio output by the audio output device and video output at a display. The one or more processors are further configured to initiate sending of audio data to the audio output device and to send video data to the display. The video data is delayed, based on the synchronization delay, relative to the sending of the audio data.