HDMI Network Device Echo Interference Avoidance
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Solution Overview
Problem
In HDMI version 1.4, echo interference occurs due to signal reflection, causing connection failures and unnecessary power consumption as the receiving end cannot distinguish between the signal from another network device and the echo signal, leading to incorrect connection establishment and increased power usage.
Innovation Solution
A network device with a scrambler, descrambler, comparator, and control unit generates and compares a first seed for the transmission signal with a second seed from the receiving signal, determining if the signal is an echo or from another device, and controls the network connection accordingly, allowing for echo interference avoidance and power-saving by temporarily halting transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting end continuously sends transmission signals to maintain network connection, then the network connection reliability is improved, but the power consumption increases and echo interference occurs
Solution Approach 1:
The transmitting end sends transmission signals periodically rather than continuously. The control unit determines whether to send signals based on periodic detection of receiving signals, creating intervals of transmission and non-transmission that reduce power consumption while maintaining connection reliability.
Solution Approach 2:
The system uses feedback mechanisms where the receiving end sends receiving signals back to the transmitting end. The control unit at the transmitting end detects these feedback signals and adjusts transmission behavior accordingly, stopping transmission when feedback indicates successful connection establishment, thereby reducing unnecessary power consumption.
2Reliability
If the transmitting end continuously sends transmission signals, then the network connection is maintained, but echo interference causes connection failures
Solution Approach 1:
The patent extracts and identifies the echo signal separately from the receiving signal by comparing seed values. The comparison unit detects when a received signal matches the transmitted signal's seed, identifying it as an echo, and the control unit then stops transmission to eliminate the harmful echo interference.
Solution Approach 2:
The system takes preliminary action by comparing seed values before fully establishing connection. When an echo is detected through seed comparison, the control unit preemptively stops transmission to prevent echo interference from causing connection failures, rather than waiting for the interference to manifest.
3Reliability
If the receiving end continuously detects signals to ensure connection, then the connection reliability is improved, but unnecessary power consumption occurs when connection is already established
Solution Approach 1:
The receiving end performs periodic signal detection rather than continuous detection. Once connection is established and confirmed through seed comparison, the detection frequency is reduced or stopped, maintaining reliability while reducing power consumption during the connected state.
Solution Approach 2:
The system uses feedback from successful connection establishment to adjust detection behavior. When the receiving end successfully decodes a transmission signal and confirms connection through seed matching, it sends feedback to the transmitting end and can reduce or stop further detection activities, saving power while maintaining the connection.
Data Source
AI summary
A network device for building up a network connection via a high-definition multimedia interface, includes a scrambler, a descrambler, a comparator and a control unit. The scrambler is utilized for generating a transmission signal according to a first seed. The descrambler is for decoding a receiving signal to generate a second seed. The comparator is for generating a comparing result according to the first seed and the second seed. The control unit is for controlling the network connection according to the comparing result.