Video Latency Measurement Using Reflected Light Signals
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Solution Overview
Problem
Current multimedia installations face challenges in synchronizing video and audio signals from independent equipment, with existing methods being either poorly implemented, costly, or complex, particularly in measuring and adjusting for video latency.
Innovation Solution
A method utilizing a photosensitive sensor integrated into the decoder equipment to measure video latency by emitting test light signals and analyzing reflected light, allowing for automatic and cost-effective synchronization without requiring user interaction or external equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external audio/video acquisition equipment is used to measure video latency, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The decoder equipment uses its own integrated photosensitive sensor to measure video latency, eliminating the need for external measurement equipment. The system performs self-diagnosis by emitting test light signals through the video reproduction equipment and capturing the reflected light with its built-in sensor, thereby achieving precise measurement without adding external devices.
Solution Approach 2:
The photosensitive sensor integrated in the decoder equipment serves multiple functions: it is used for both capturing video content during normal operation and for measuring video latency through emitted test light signals. This multi-functionality eliminates the need for dedicated external measurement equipment while maintaining measurement precision.
2Measurement precision
If external audio/video acquisition equipment is used to measure video latency, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The measurement process is fully automated through the decoder equipment's self-service capability. The system automatically emits test light signals, captures the reflected light with the integrated photosensitive sensor, processes the captured signals, and calculates video latency without requiring user installation of applications or manual audio capture operations.
Solution Approach 2:
The measurement function is extracted and integrated into the decoder equipment itself, removing the need for external measurement tools and complex user operations. The system extracts only the necessary test light emission and capture functions needed for latency measurement, simplifying the overall operation.
3Ease of operation
If the photosensitive sensor captures reflected light from the environment, then ease of operation is improved, but measurement precision may worsen
Solution Approach 1:
The system emits test light signals in periodic flashes with specific temporal patterns. By using periodic emission rather than continuous light, the system creates distinct, time-separated signals that are easier to detect and measure accurately, even when captured indirectly through environmental reflection.
Solution Approach 2:
The test light signals use specific color characteristics that can be distinguished from ambient environmental light. By utilizing particular wavelength ranges or color patterns for the test signals, the system maintains measurement precision even when the sensor captures reflected light from the environment rather than direct light.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simple, automatic, and cost-effective measurement of video latency, facilitating synchronization between video and audio reproduction equipment without additional hardware or user complexity, improving the multimedia experience.
Implementation Method 1
acquiring, using the photosensitive sensor, captured light signals comprising test light signals received which result from a reflection of the test light signals emitted
Implementation Method 2
captured light signals comprising test light signals received which result from a reflection of the test light signals emitted on at least one surface of an environment of the video reproduction equipment
Data Source
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AI summary
A method for measuring video latency induced by a video playback device (2) connected to a decoder device (1) in which a photosensitive sensor (8) is integrated, comprising the steps of: - generating test light signals from a screen of the video playback device (2); - acquiring, using the photosensitive sensor (8), captured light signals including received test light signals resulting from a reflection of the emitted test light signals on at least one surface of an environment of the video playback device (2); - acquiring measurement signals produced by the photosensitive sensor (8) from the captured light signals, and analyzing the measurement signals to obtain a video latency measurement.