CATV Entry Adapter Signal Isolation and Privacy
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Solution Overview
Problem
CATV networks face challenges in maintaining privacy and security of In-Home Entertainment (IHE) signals, as they can leak into adjacent subscriber premises, causing interference and compromising network functionality, and existing solutions for IHE signal rejection are prone to unauthorized removal, tampering, and physical exposure.
Innovation Solution
The development of a CATV entry adapter with a signal attenuation and communication device using directional couplers and IHE frequency rejection filters, which blocks IHE signals from entering the CATV network while allowing CATV signals to pass, ensuring secure and private IHE network operations within each subscriber's premises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IHE signals are allowed to pass through the CATV network infrastructure, then in-home entertainment functionality is enabled, but signal privacy is compromised and interference with adjacent premises occurs
Solution Approach 1:
The patent introduces an entry device as an intermediary component between the CATV network infrastructure and the subscriber premises. This device includes IHE signal rejection filters that selectively block IHE signals from entering the CATV network while allowing CATV signals to pass through. The entry device acts as a mediator that enables IHE functionality within the premises while preventing signal leakage into the broader network, thus resolving the contradiction between IHE versatility and signal privacy protection.
Solution Approach 2:
The patent implements location-specific signal filtering by placing IHE rejection filters at the entry point of each subscriber premises. The filtering characteristics are tailored to the specific needs of each location, allowing IHE signals to be confined to individual premises while maintaining CATV service. This local quality approach enables IHE functionality to be preserved within each home while preventing harmful signal propagation to adjacent premises.
2Object-affected harmful factors
If existing IHE signal rejection solutions are implemented, then signal privacy is improved, but the solutions are prone to unauthorized removal and tampering
Solution Approach 1:
The patent combines the IHE signal rejection functionality with the existing CATV entry device infrastructure. Rather than using separate, externally attachable filters that can be easily removed, the rejection filters are integrated into the entry device that is already part of the CATV installation. This merging approach makes the signal privacy protection more reliable and difficult to unauthorizedly remove, as it becomes part of the established infrastructure rather than an add-on component.
Solution Approach 2:
The patent embeds the IHE rejection filters within the existing CATV entry device structure. The filters are nested inside the entry device housing, which itself is integrated into the CATV network infrastructure. This nested arrangement provides physical protection and makes unauthorized access or removal difficult, while still allowing the filters to perform their signal privacy protection function effectively.
3Reliability
If IHE signals are blocked from entering the CATV network, then network security is improved, but signal attenuation devices may interfere with CATV signal transmission
Solution Approach 1:
The patent utilizes frequency-based parameter differentiation to resolve the contradiction. The IHE rejection filters are designed to attenuate signals specifically in the IHE frequency range while maintaining transparency to CATV signals in their designated frequency bands. By changing the filtering parameters to be frequency-selective rather than broad-spectrum, the system achieves network security through IHE signal blocking without interfering with legitimate CATV signal transmission.
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
The solution effectively confines IHE signals within the subscriber's premises, preventing interference and maintaining network security and functionality, while being resistant to unauthorized removal and physical exposure, thus enhancing the privacy and security of IHE content.
Implementation Method 1
a signal attenuation and communication device comprising one or more directional couplers. The signal attenuation and communication device is configured to permit upstream and downstream external network signals to communicate between the entry port and a first network port, and between the entry port and a second network port
Implementation Method 2
an in-home network signal blocking device that is upstream of the first splitter and downstream of the entry port. The in-home network rejection device is configured to permit the external network signals to pass therethrough depending on the external network signals being in a first frequency band, and to block the in-home network signals from passing therethrough depending on the in-home network signals being in a second frequency band
Data Source
AI summary
A cable television (CATV) entry adapter connects to a CATV network and serves as a hub in an In-Home Entertainment (IHE) network. IHE signals may be communicated between passive and active ports of an embodiment of the entry adapter through a pair of directional couplers which allow an IRE-enabled embedded multimedia terminal device (eMTA) at the passive port to communicate with multimedia devices of the IHE network connected to the active ports. An IHE frequency rejection filter is used in some embodiments to confine IHE signal to a single subscriber premise. In some embodiments a bidirectional IHE bandpass filter is used to enable IHE signals to pass between the passive and active ports of the CATV entry adapter.