Ceiling Microphone Directivity Control for False Recognition Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ceiling microphone systems can erroneously recognize a talker due to variations in speaker volume settings, positional relationships between speakers and microphones, or microphone arrays, leading to decreased voice quality.
Innovation Solution
A control method for ceiling microphones that involves acquiring voice signals from both an array microphone and external sources, determining the output voice signal from a speaker, and adjusting the microphone's directivity to prevent false recognition by fixing the voice collecting direction when the speaker's voice is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ceiling microphone uses an array microphone to collect voice signals, then the voice collection capability is improved, but the risk of false recognition of the talker increases due to speaker volume settings and positional relationships
Solution Approach 1:
The system continuously monitors the collected voice signals and uses feedback to distinguish between the speaker's voice and the talker's voice. By analyzing the characteristics of the voice signals and comparing them against stored reference data, the system can accurately identify when the speaker is talking and adjust its operation accordingly to prevent false recognition of the talker.
Solution Approach 2:
The system changes operational parameters based on the detected speaking state. When the speaker's voice is detected, the system adjusts the sensitivity and directivity parameters of the array microphone to reduce the collection of talker voices. This dynamic parameter adjustment allows the system to maintain high voice collection capability while preventing false recognition under varying acoustic conditions.
2Adaptability or versatility
If the ceiling microphone maintains dynamic directivity control, then the adaptability to different talker positions is improved, but the complexity of controlling the microphone array increases when speaker voice is detected
Solution Approach 1:
The system implements dynamic directivity control that automatically adjusts the microphone array's sensitivity pattern based on the detected speaking state. When the speaker is detected, the system dynamically changes the directivity pattern to reduce talker voice collection. This dynamic adaptation maintains versatility in capturing different talker positions while managing complexity through automated state-based control logic.
Solution Approach 2:
The system performs preliminary detection of the speaker's voice before fully engaging the array microphone in talker voice collection mode. By preliminarily identifying when the speaker is talking, the system can proactively adjust its directivity control to prevent false recognition, rather than reacting after false recognition has occurred. This preliminary action simplifies the overall control complexity by enabling more predictable and planned adjustments.
Data Source
AI summary
A control method of a ceiling microphone includes acquiring a first voice signal collected by an array microphone including the plurality of microphone elements and an external voice signal collected in a space different from a space of the ceiling microphone; determining an output voice signal output from a speaker provided in a same space as the space of the ceiling microphone, based on the acquired first voice signal and the acquired external voice signal; and outputting the determined output voice signal to the speaker, and when it is determined that the output voice signal output from the speaker is output, stopping control of directivity of the array microphone that collects the voice of the talker and fixing a voice collecting direction in which the voice of the talker is collected.