Terminal Howling Removal via Frequency Band Gain Adjustment
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Solution Overview
Problem
In IoT environments, particularly during multi-party voice calls, howling occurs between terminals when they are in close proximity, degrading call quality and increasing power consumption, necessitating a method to suppress or remove this phenomenon efficiently.
Innovation Solution
A terminal operation method that detects howling frequency bands by analyzing energy changes and voice loop cycle information, and adjusts gain to remove howling, using a notch filter to minimize sound quality degradation and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals are located within a short range during a multi-party call, then communication convenience is improved, but howling occurs between terminals generating amplified roaring sound
Solution Approach 1:
The patent detects howling frequency bands and uses this harmful phenomenon's characteristics to apply targeted noise removal. By identifying the specific frequency where howling occurs and applying gain adjustment only to that frequency band, the system converts the problematic howling signal into actionable information for suppression, eliminating the harmful effect while preserving useful voice communication.
Solution Approach 2:
The patent applies different processing to different frequency bands rather than treating all frequencies uniformly. By detecting the specific howling frequency band and applying gain adjustment only to that localized frequency range, the system removes howling while maintaining the quality of other frequency bands, thus solving the contradiction locally rather than globally.
2Reliability
If noise removal processing is applied to remove howling, then call quality is improved, but sound quality degradation occurs
Solution Approach 1:
The patent applies gain adjustment only to the detected howling frequency band rather than across the entire frequency spectrum. This localized processing removes howling while preserving the quality of other frequency bands, thus improving call quality without causing widespread sound quality degradation.
Solution Approach 2:
The patent applies noise removal processing selectively only to the extent necessary - specifically to the detected howling frequency band - rather than applying excessive processing across all frequencies. This partial action removes the harmful howling while minimizing impact on overall sound quality.
3Reliability
If howling removal processing is applied, then call quality is improved, but power consumption increases
Solution Approach 1:
The patent performs frequency band analysis and applies gain adjustment only to the specific howling frequency band detected, rather than processing the entire audio signal. This localized approach reduces computational complexity and power consumption while still achieving effective howling removal and improving call quality.
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
Improves call quality by effectively suppressing howling between terminals during voice calls, reducing sound quality degradation and power consumption, especially in short-range scenarios.
Implementation Method 1
The call quality of a terminal may be improved by removing or suppressing howling occurring between terminals during a call... removing the howling by adjusting a gain of the howling frequency band
Data Source
AI summary
An operation method of a terminal may include: executing a voice call service between the terminal and at least one terminal; determining at least one short-range terminal existing within a preset range from among the at least one terminal, based on location information of the terminal; detecting a howling frequency band in which howling occurs between the terminal and the at least one short-range terminal from among a plurality of frequency bands in which the voice call service is performed, based on information of the plurality of frequency bands; and removing the howling by adjusting a gain of the howling frequency band.