Video Transmitting Apparatus CEC Connection Detection
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Solution Overview
Problem
Existing video signal transmitting systems face challenges in accurately detecting the connection of a video signal source and displaying apparatus for wireless transmission, leading to reduced video compression ratios and potential picture quality deterioration, especially when using CEC messages over wireless channels.
Innovation Solution
A video transmitting apparatus that utilizes a first register to read EDID information from a video signal source and a second register to read EDID information from a displaying apparatus, determining direct connection only when both are set, with mechanisms for storing states in nonvolatile memory and controlling CEC message transmission to prevent interference and ensure high picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless transmission is used for video signal transmission, then installation flexibility is improved, but transmission speed deteriorates
Solution Approach 1:
The system performs preliminary actions by detecting device connections and reading EDID information before initiating video compression and transmission. This ensures that all necessary device specifications are known in advance, allowing optimization of compression parameters suited for wireless transmission constraints.
Solution Approach 2:
The system changes transmission parameters dynamically based on detected device capabilities. By reading EDID information from connected devices, the system adjusts video compression ratios, resolution, and other parameters to optimize wireless transmission performance while maintaining acceptable picture quality.
2Productivity
If video compression is increased to compensate for lower transmission speed, then transmission efficiency is improved, but picture quality deteriorates
Solution Approach 1:
The system dynamically adjusts compression parameters based on EDID information from the displaying apparatus. By understanding the capabilities of the display device, the system optimizes the balance between compression ratio and picture quality, applying higher compression only when the display device can adequately render the reduced quality.
Solution Approach 2:
The system uses EDID information as feedback about the displaying apparatus capabilities to adjust compression parameters. This feedback mechanism allows the system to tailor the compression level to match the actual performance requirements of the connected display device.
3Measurement precision
If CEC message transmission is enabled for device detection, then device identification accuracy is improved, but wireless communication complexity increases
Solution Approach 1:
The system uses CEC messages as an intermediary mechanism for device detection and identification. By leveraging the existing CEC protocol infrastructure, the system can accurately identify connected devices and their capabilities without building a complex custom communication protocol from scratch.
Solution Approach 2:
The system utilizes the CEC protocol's multi-functionality for both device detection and capability identification. This universal approach allows a single communication mechanism to handle multiple tasks, reducing overall system complexity compared to implementing separate dedicated protocols for each function.
4Manufacturing precision
If advanced video processing is performed before compression to maintain quality, then picture quality is improved, but processing time increases
Solution Approach 1:
The system performs advanced video processing operations before compression as preliminary actions. By preparing the video signal in advance with deinterlacing, noise reduction, and other enhancement operations, the system ensures high picture quality is achieved before the time-constrained wireless transmission begins.
Data Source
AI summary
A video transmitting apparatus including: a first register that is set when receiving a CEC (Consumer Electronics Control) message which is transmitted by a video signal source and is reset in response to a leading edge of a predetermined voltage that is supplied from said video signal source; and a second register which reads an EDID (Extended Display Identification Data) of a video displaying apparatus, is set when a decision is made that said video displaying apparatus is a predetermined video displaying apparatus, and is reset when a state where an HPD (Hot Plug Detect) is in a state of low has continued for a predetermined period of time or longer, wherein when both of said first and second registers have been set, a determination is made that said video signal source, said video transmitting apparatus, and said video displaying apparatus have been connected.