Digital Signal Processing Device Hot-Plug Detection
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Solution Overview
Problem
Digital signal processing devices face delays in determining the absence of a digital signal input via a digital signal cable, leading to a poor user experience due to the time it takes to detect the absence of a Transition Minimized Differential Signaling (TMDS) signal after a High-bandwidth Digital Content Protection (HDCP) certification, often resulting in a five-second delay before notifying the user of a no signal state.
Innovation Solution
The implementation of a digital signal processing device with a TMDS signal input section, a hot-plug signal input section, and determination sections that differentiate between the presence and absence of TMDS and hot-plug signals by setting distinct threshold numbers and times for determining the absence of digital signal input, allowing for quicker detection of signal absence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device waits for TMDS signal to determine digital signal presence, then detection accuracy is improved, but detection time increases causing user anxiety
Solution Approach 1:
The patent applies preliminary action by detecting the hot-plug signal before the TMDS signal becomes available. The hot-plug signal is detected during the HDCP certification process, which occurs before the actual digital signal transmission. This allows the device to anticipate signal presence/absence earlier, reducing the 5-second delay while maintaining accurate detection through subsequent TMDS signal verification.
2Reliability
If the device uses only TMDS signal for detection, then detection reliability is improved, but response speed deteriorates due to HDCP certification delay
Solution Approach 1:
The patent uses the hot-plug signal as an intermediary indicator to predict digital signal presence. Instead of directly relying on the TMDS signal which is delayed by HDCP certification, the system uses the hot-plug signal as an early warning indicator. This intermediary approach allows faster initial detection while the TMDS signal provides ultimate confirmation, thus improving response speed without sacrificing reliability.
Data Source
AI summary
In at least one embodiment of the disclosure, a digital signal processing device is configured to receive a TMDS signal and a hot-plug signal via a digital signal cable. A TMDS signal determination section is configured to determine whether the TMDS signal has been received. A hot-plug signal determination section is configured to determine whether the hot-plug signal has been received every t seconds when the TMDS signal has not been received. A digital signal determination section is configured to determine that a digital signal is present if the TMDS signal is received. A digital signal is determined absent if (a) the hot-plug signal has not been received n times (n being an integer equal to or greater than one), or (b) the hot-plug signal has been received m times (m being an integer equal to or greater than two and m being greater than n).