Communication Apparatus Frequency Band Interference Suppression

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Solution Overview

Problem

Communication signals using coaxial cables in home networks can interfere with cable television signals, causing disruptions due to the inability of existing technologies to detect and avoid frequency overlaps with cable modem signals.

Innovation Solution

A communication apparatus with a reception unit, transmission unit, interference signal detection unit, and signal transmission control unit that modulates transmission data using specific frequency bands to avoid interference with cable modem signals by detecting and adjusting frequency bands to prevent overlap with both the initial and cable modem frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If communication signals are transmitted using coaxial cables in home networks, then communication functionality is achieved, but interference with cable television signals occurs

Engineering Contradiction:

Improvecommunication functionalityVSAvoidsignal interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The communication apparatus dynamically adjusts its transmission frequency band based on real-time detection of cable modem signals. The frequency band is not fixed but changes adaptively to avoid interference, allowing the system to maintain communication functionality while preventing harmful interference with cable television signals

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the frequency band parameter of the communication signal based on detection results. When cable modem signals are detected in specific frequency ranges, the communication apparatus switches to alternative frequency bands, thereby modifying the transmission parameters to eliminate interference while preserving communication capability

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If frequency bands are fixed for communication, then device complexity is reduced, but interference with cable modem signals cannot be avoided

Engineering Contradiction:

Improvefrequency band managementVSAvoidcommunication stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The communication apparatus performs preliminary detection of cable modem signals in the desired frequency band before initiating transmission. This advance detection allows the system to identify potential interference sources and select appropriate frequency bands in advance, preventing interference without requiring complex real-time adjustment mechanisms during active communication

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a feedback mechanism where the detection unit continuously monitors for cable modem signals and provides information to the control unit. Based on this feedback, the communication apparatus adjusts its frequency band selection, creating a closed-loop control system that maintains reliable communication while avoiding interference through continuous monitoring and adaptation

Inventive Principle:

Principle #23Feedback

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 suppresses interference between communication signals and cable modem signals, ensuring stable communication even in environments with nearby cable modems by dynamically adjusting frequency bands.

Implementation Method 1

a transmission unit that sends a transmission signal obtained by modulating transmission data with a frequency included in a first frequency band to the metal cable

Methodology Applied

Scientific EffectModulation: Phase Modulation

Implementation Method 2

an interference signal detection unit that detects a signal used in communication using a cable modem, modulated by a frequency included in a second frequency band, and transmitted over the metal cable as an interference signal

Methodology Applied

Scientific EffectElectromagnetic signal detection:

Implementation Method 3

a signal transmission control unit that instructs the transmission unit to modulate transmission data using a frequency included in a third frequency band that does not have any frequency band overlapping the second frequency band when the interference signal is detected

Methodology Applied

Scientific EffectFrequency band adjustment:

Data Source

PatentUS8914838B2Communication apparatus that suppresses interference of communication signal of communication apparatus using a cable, and method and program for controlling the same

Publication Date: 2014.12.16 NEC MAGNUS COMM

AI summary

A communication apparatus comprises a reception unit that receives a reception signal from a metal cable and extracts reception data; a transmission unit that sends a transmission signal obtained by modulating transmission data with a frequency included in a first frequency band to the metal cable; an interference signal detection unit that detects a signal used in communication using a cable modem, modulated by a frequency included in a second frequency band, and transmitted over the metal cable as an interference signal; and a signal transmission control unit that instructs the transmission unit to modulate transmission data using a frequency included in a third frequency band that does not have any frequency band overlapping the second frequency band when the interference signal is detected and a frequency band overlapping both the first frequency band and the second frequency band exists.