HDMI Data Conversion Device with Dynamic Pixel Clock Tuning
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Solution Overview
Problem
Conventional HDMI receiving devices face challenges in adjusting the pixel clock to prevent input overflow or output underflow, leading to inefficiencies in data conversion and storage.
Innovation Solution
A data conversion device comprising a storage circuit and a frequency tuning circuit that adjusts the pixel clock based on the accumulated volume of stored and outputted data, using a phase-locked loop and error generator to maintain an optimal storage volume range, thereby preventing overflow or underflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HDMI receiving device uses a fixed receiving clock domain, then the device structure is simple, but input overflow or output underflow occurs due to mismatched data rates
Solution Approach 1:
The patent applies dynamics by making the receiving clock domain adjustable rather than fixed. The frequency tuning circuit dynamically adjusts the second clock frequency based on feedback from the storage circuit's data volume, allowing the system to adapt to varying data rates and prevent overflow/underflow conditions while maintaining operational reliability.
Solution Approach 2:
The patent implements feedback through the error generator that continuously monitors the data volume in the storage circuit and generates control signals to adjust the second clock frequency. This closed-loop feedback mechanism ensures the receiving device maintains optimal data flow by comparing actual storage levels against target ranges and automatically correcting deviations.
2Productivity
If the HDMI receiving device increases data output rate, then productivity improves, but output underflow occurs due to excessive data output rates
Solution Approach 1:
The feedback mechanism monitors storage circuit data volume and adjusts the second clock frequency to maintain optimal output rates. When data volume indicates approaching underflow conditions, the system automatically reduces the output rate, preventing reliability issues while maximizing productivity within safe operational limits.
Solution Approach 2:
The system maintains a target data volume range in the storage circuit, effectively creating a buffer or cushion against underflow conditions. By keeping data volume within optimal bounds before problems occur, the system prevents underflow rather than reacting after it happens, ensuring both productivity and reliability.
3Reliability
If the HDMI receiving device decreases data output rate, then output underflow is prevented, but input overflow occurs due to excessive data accumulation
Solution Approach 1:
The feedback control system prevents overflow by monitoring storage circuit data volume and adjusting the second clock frequency downward when accumulation exceeds target levels. This dynamic adjustment maintains reliability by preventing overflow while minimizing impact on productivity through controlled, gradual rate reductions.
Solution Approach 2:
The system dynamically adjusts the data output rate based on real-time storage conditions rather than operating at a fixed rate. This allows the system to optimize productivity by running at higher rates when storage capacity is available and reducing rates only when necessary to prevent overflow, achieving both reliability and productivity goals.
4Productivity
If the HDMI receiving device uses fixed clock domain conversion, then device complexity is low, but data conversion efficiency deteriorates due to input overflow or output underflow
Solution Approach 1:
The frequency tuning circuit provides dynamic clock domain conversion, adjusting the second clock frequency based on actual data flow conditions. This dynamic approach significantly improves data conversion efficiency by preventing overflow and underflow, justifying the increased device complexity through substantial gains in operational efficiency and reliability.
Solution Approach 2:
The feedback mechanism enables the frequency tuning circuit to operate efficiently by using information from the storage circuit's data volume to make precise adjustments to the clock frequency. This feedback-driven approach ensures that the additional complexity of the frequency tuning circuit translates directly into improved data conversion efficiency by maintaining optimal operating conditions.
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
Effectively adjusts the pixel clock to prevent overflow or underflow, ensuring timely and efficient output of image data, thereby maintaining optimal storage and output rates.
Implementation Method 1
using a phase-locked loop and error generator to maintain an optimal storage volume range
Data Source
AI summary
A data conversion device includes a storage circuit and a frequency tuning circuit. The storage circuit is configured to store a pixel data in a high definition multimedia interface (HDMI) signal according to a first clock, and output an image data according to a second clock. The frequency tuning circuit is configured to adjust the second clock according to a control signal and the second clock in the HDMI signal, and transmit the adjusted second clock to the storage circuit.