External Speaker Latency Detection for Audiovisual Synchronization
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Solution Overview
Problem
Peripheral audio devices introduce delays in audio playback, leading to unsynchronized audiovisual media due to inadequate user-adjustment methods lacking granularity and requiring user intervention, which is cumbersome and unsuitable for various media formats.
Innovation Solution
A display device transmits signals to both internal and external speakers, determining latency by comparing reception times to synchronize audiovisual content automatically without user intervention, using spread spectrum signals if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If user-adjustment methods are used to synchronize audiovisual content, then synchronization can be achieved, but the method requires user intervention which is cumbersome and lacks granularity
Solution Approach 1:
The system automatically measures latency by transmitting test signals through the audio chain and detecting their arrival time, then self-adjusts playback timing without user intervention. The electronic device performs the entire synchronization process autonomously by comparing measured latency against threshold values and applying appropriate timing adjustments.
Solution Approach 2:
The system implements a feedback mechanism where test signals are transmitted through the audio output chain and their reception time is detected and compared against expected timing. This feedback loop enables the system to automatically determine latency values and adjust playback timing accordingly, eliminating the need for manual user adjustment while achieving precise synchronization.
2Adaptability or versatility
If peripheral audio devices are used to provide audio output, then audio versatility is improved, but latency is introduced that desynchronizes audiovisual content
Solution Approach 1:
The system performs preliminary latency measurement by transmitting test signals through the audio chain before actual media playback. Based on the measured latency and predetermined thresholds, the system pre-adjusts playback timing parameters to compensate for the expected delay, ensuring synchronization is established in advance rather than requiring real-time correction.
3Measurement precision
If automatic latency detection is implemented, then synchronization precision is improved, but device complexity increases
Solution Approach 1:
The system uses an intermediary test signal as a carrier to measure latency through the audio chain. This test signal acts as a mediator between the electronic device and peripheral audio device, enabling precise timing measurement without requiring complex synchronization protocols or additional hardware components. The test signal simplifies the measurement process while maintaining accuracy.
Data Source
AI summary
Disclosed herein are system, apparatus, article of manufacture, method and/or computer program product embodiments, and/or combinations and sub-combinations thereof, for synchronizing playback of audiovisual media. An example process includes receiving, via at least one microphone, a first signal that is outputted from at least one external speaker that is coupled to a display device; determining, based on the first signal, a latency associated with the at least one external speaker, wherein the latency corresponds to a difference between a transmission time of the first signal by the display device to the at least one external speaker and an output time of the first signal by the at least one external speaker; and providing the latency to the display device, wherein the display device is configured to adjust at least one of a video playback timing and an audio playback timing of an audiovisual media content item based on the latency.