Robot Voice Direction-Seeking Turning System
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Solution Overview
Problem
Existing sound source localization technologies in robot systems are limited to locating sound sources with higher energy values, leading to errors in voice direction detection, which can be disrupted by noise, resulting in reduced signal-to-noise ratios and impaired user experience in voice recognition.
Innovation Solution
A robot voice direction-seeking turning system comprising a voice acquisition unit, voice activity detection unit, and voice direction-seeking unit that detects voice signals, calculates direction-seeking angles, and drives the robot to turn towards the user, enhancing voice recognition accuracy and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sound source localization technology is used to locate sound sources with higher energy values, then the robot can detect sound sources, but the voice direction detection is disrupted by noise leading to reduced accuracy
Solution Approach 1:
The patent introduces a voice activity detection unit as an intermediary between the sound signal acquisition and direction determination. This intermediary component filters and identifies actual voice signals from the sound field, distinguishing them from noise based on voice activity characteristics rather than just energy levels, thereby improving voice direction detection accuracy in noisy environments
Solution Approach 2:
The patent replaces the traditional energy-based sound source localization mechanism with a voice activity detection mechanism. Instead of relying on acoustic energy magnitude to locate sound sources, the system uses voice activity detection algorithms to identify and locate actual voice signals, substituting the mechanical energy-based approach with a more intelligent signal processing approach that is resistant to noise interference
2Reliability
If the robot turns to left and right based on erroneous direction judgment, then the robot attempts to locate the user, but the microphone array beam fails to point at the user reducing signal-to-noise ratio
Solution Approach 1:
The patent implements a feedback mechanism where the voice direction-seeking unit continuously monitors the sound field, determines the direction of voice signals, and adjusts the robot's orientation and microphone array beam direction accordingly. This closed-loop feedback system ensures the robot turns accurately toward the user and the microphone array points at the user, maintaining high signal-to-noise ratio and voice recognition accuracy
Solution Approach 2:
The patent performs preliminary voice activity detection and direction determination before the robot executes turning actions. By pre-identifying the voice signal direction using the voice activity detection unit and voice direction-seeking unit, the system ensures the robot turns to the correct direction in advance, preventing erroneous turning and ensuring the microphone array is properly oriented to capture the user's voice with high signal-to-noise ratio
Data Source
AI summary
A robot voice direction-seeking turning system and method. The robot voice direction-seeking turning system employs a voice activity detection unit (1) that detects a received voice signal to determine whether or not a voice signal transmitted by a user (S2) is present; a direction-seeking angle for the voice signal is calculated by a voice direction-seeking unit (3), and a voice direction-seeking turning unit (4) is employed to drive a robot to turn towards the direction of the sound source of the voice signal on the basis of a direction-seeking angle (S4). Employment of the robot voice direction-seeking turning method allows accurate acquisition of a valid voice signal transmitted by the user, thus increasing signal-to-noise ratio and the accuracy of voice recognition.