Media Center PC Channel Change Error Correction
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Solution Overview
Problem
Media center personal computers experience channel change errors due to system delays causing external tuners to miss proper channel information, particularly with the first digit of the channel not being properly sent or received, leading to recording of blank screens.
Innovation Solution
A method that monitors channel change instructions sent by an IR remote control device to an external tuner, resending instructions if the tuner output does not change, and providing redundancy by switching to alternative IR remote control devices and tuner cards if initial ones fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission rate of the IR remote device is slowed down, then subsequent digits of the channel are properly transmitted, but the first digit of the channel is still not properly sent or received
Solution Approach 1:
The system performs preliminary verification by monitoring the tuner output immediately after channel change instructions are sent. By detecting whether the output is actually changing, the system can identify transmission failures before they result in blank screen recordings, allowing for corrective action to be taken proactively
Solution Approach 2:
The system implements a feedback mechanism by continuously monitoring the tuner output signal after sending channel change instructions. If the output does not change as expected, the system resends the instructions, creating a closed-loop control system that ensures reliable channel changes while maintaining normal transmission speeds
2Productivity
If the PC sends channel change instructions quickly, then channel changing is efficient, but system delays cause the external tuner to miss proper channel information
Solution Approach 1:
The monitoring mechanism provides real-time feedback on whether the tuner output is actually changing in response to channel change instructions. This allows the system to maintain high transmission speeds while verifying successful delivery, compensating for system delays through active verification rather than passive assumption
Solution Approach 2:
The system dynamically adjusts its approach by monitoring the actual tuner output response rather than relying on fixed timing assumptions. This dynamic verification adapts to varying system delays and ensures reliable channel information delivery regardless of timing variations in the system
3Speed
If the IR remote control device transmits channel digits rapidly, then channel changes occur quickly, but digits are dropped during transmission
Solution Approach 1:
The system performs preliminary verification by monitoring the tuner output immediately after transmission to detect whether all channel digits were successfully received. This early detection allows for rapid retransmission of incomplete data without significantly impacting overall channel change speed
Solution Approach 2:
By implementing feedback through output monitoring, the system can detect incomplete channel digit transmission and trigger corrective retransmission. This maintains high transmission speeds while preventing information loss through active verification and correction
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 corrects channel change errors by ensuring accurate channel changes and providing a redundant path for error handling, preventing blank screen recordings and improving system reliability.
Implementation Method 1
The external tuners are configured to responds to IR signals and the media center PC has one or more IR remote control device devices that transmits IR signals to one or more external tuners
Data Source
AI summary
A method corrects channel change errors in a media center personal computer system. The media center personal computer system has a personal computer coupled to an infrared (IR) remote control device and a tuner card coupled to an output of an external tuner. The method determines when channel change instructions have been sent from the IR remote control device to the external tuner. It then determines whether an output from the external tuner is changing and if not, resends the channel change instructions from the IR remote control device to the external tuner upon determining that the output from the external tuner is not changing.