Phase-Flipped Audio Signal Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-channel intercom systems experience significant crosstalk due to capacitive coupling, particularly at longer cable lengths, which degrades audio communication quality and intelligibility.
Innovation Solution
A multi-channel intercom system that generates a modulation carrier signal to create clock signals and phase-flip audio signals, transferring these signals between user stations to invert and sample audio signals, thereby reducing crosstalk by modifying audio signals on one channel using phase inversion techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If multi-channel intercom systems use wired audio communication with longer cable lengths, then communication range is extended, but crosstalk increases due to capacitive coupling
Solution Approach 1:
The patent applies phase inversion to audio signals transmitted over wired channels. By inverting the phase of audio signals on one channel relative to another, and using differential processing at the receiving end, the system cancels out crosstalk caused by capacitive coupling. This inversion technique transforms the harmful capacitive coupling effect into a beneficial cancellation mechanism, allowing extended cable lengths without proportional increase in crosstalk.
2Reliability
If phase inversion is applied to reduce crosstalk, then audio communication clarity is improved, but system complexity increases due to additional signal processing
Solution Approach 1:
The patent implements phase inversion using periodic clock signals to toggle the phase state of audio channels. A master clock generates synchronized clock signals that periodically invert the phase of audio signals on specific channels. This periodic action provides a systematic and repeatable method for crosstalk reduction that can be easily synchronized across multiple channels, reducing the complexity of coordinating phase inversion across the intercom system.
Solution Approach 2:
The patent introduces clock signals as an intermediary mechanism to control phase inversion. Rather than directly complex signal processing of audio channels, the system uses simple clock signals as mediators to trigger phase inversion at precise intervals. This intermediary approach simplifies the overall system architecture by decoupling the complex audio signal processing from the phase control mechanism.
Data Source
AI summary
Systems and methods for operating a multi-channel intercom system for audio communications between users, with reduced crosstalk, are disclosed. Exemplary implementations may: receive, by a first user station, a modulation carrier signal; capture a first audio signal from a first user, wherein the first audio signal has a first phase; at a rate based on the modulation carrier signal, invert the first phase of the first audio signal to generate a phase-flipped audio signal; transfer the phase-flipped audio signal to a second user station; at a second rate based on the modulation carrier signal, invert a phase of the phase-flipped audio signal to generate an intermediate audio signal; and present a second audio signal based on the intermediate audio signal to the second user.