TMDS Decode Receiver Power-Down for Undecodable Video Formats
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Solution Overview
Problem
Conventional high-speed digital interface decode receivers can operate beyond specified speeds when receiving undecodable digital signals, leading to abnormalities such as thermal runaway, increased power consumption, and circuit destruction.
Innovation Solution
A digital interface decode receiver comprising a decoder circuit, a processing circuit, and a controlling device that determines if the input signal is decodable, stopping the processing circuit's operation when it is not, and optionally notifying the user through display or voice outputs, to prevent abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the processing circuit operates continuously to process all incoming digital signals, then the device can handle various signal formats, but thermal runaway and circuit destruction occur when undecodable signals are received
Solution Approach 1:
The controlling device performs format verification on the incoming digital signal before the processing circuit processes it. This preliminary check determines whether the signal has a decodable format, and only if it does, the processing circuit is activated. This prevents undecodable signals from causing thermal runaway or circuit destruction while still allowing the device to handle various signal formats safely.
Solution Approach 2:
The controlling device acts as an intermediary between the decoder circuit and the processing circuit. It verifies the signal format and controls the operation of the processing circuit based on the verification result. This intermediary function ensures that the processing circuit only operates on valid signals, preventing abnormalities while maintaining signal format compatibility.
2Reliability
If the processing circuit stops operation when undecodable signals are detected, then circuit safety is improved, but processing capability is reduced
Solution Approach 1:
The controlling device performs format verification before activating the processing circuit. This preliminary check ensures that only signals with decodable formats are processed, preventing circuit safety issues while maintaining full processing capability for valid signals. The processing circuit remains fully functional when needed but is protected from undecodable signals.
3Reliability
If format verification is performed before processing, then circuit safety is improved, but device complexity increases
Solution Approach 1:
The controlling device performs multiple functions: it verifies the signal format, determines decodability, and controls the processing circuit operation. By consolidating these control functions into a single device, the patent achieves circuit safety through format verification without significantly increasing overall device complexity. The controlling device acts as a multi-functional controller that manages the entire signal processing workflow.
Data Source
AI summary
A power-down determination circuit calculates the horizontal frequency and vertical frequency, respectively, employing a clock signal obtained from a multiplier circuit and horizontal synchronization signal and vertical synchronization signal obtained from a TMDS decode circuit. The power-down determination circuit then determines whether an input digital signal does or does not have a decodable video format by comparing the calculated horizontal frequency and vertical frequency with horizontal frequencies and vertical frequencies stored beforehand, for output of a power-down control signal indicative of the determination. Thus, in the case where the input digital signal does not have a decodable format, the power-down control signal controls a video/audio processing circuit to enter a power-down mode.