Voice Recognition Device Noise Reduction Amplitude Normalization
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Solution Overview
Problem
Conventional voice recognition and sound reproduction techniques fail to effectively remove noise from inputted voices with high noise levels, resulting in a smaller amplitude for the reproduced voice compared to a fixed reply voice.
Innovation Solution
A voice recognition device comprising a voice recognition unit, a voice recognition dictionary, a dialog control unit, a reproduction noise reduction unit, and an amplitude adjusting unit that removes noise from inputted voice data and adjusts the amplitude to a predetermined level, ensuring the reproduced voice has a consistent and clear amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise removal is performed on inputted voice data, then the voice recognition rate is improved, but the amplitude of the reproduced voice becomes smaller than a fixed reply voice
Solution Approach 1:
The patent applies parameter changes by adjusting the amplitude of the noise-removed voice data through an amplitude adjusting unit. The unit modifies the amplitude parameter of the voice signal to match the amplitude level of fixed reply voice data, thereby resolving the contradiction between improving recognition rate through noise removal and maintaining adequate amplitude for natural sound reproduction.
2Strength
If amplitude adjustment is made to voice data with noise, then the sound amplitude is normalized, but the noise component remains in the voice data
Solution Approach 1:
The patent segments the voice processing into distinct functional stages: a noise removal unit that first extracts and eliminates the noise component, followed by an amplitude adjusting unit that independently normalizes the amplitude of the cleaned voice data. This segmentation allows each unit to perform its specific function optimally without interference, achieving both noise removal and amplitude normalization.
Solution Approach 2:
The patent applies preliminary action by performing noise removal on the voice data before conducting amplitude adjustment. The noise removal unit processes the voice data first to eliminate harmful noise components, and then the amplitude adjusting unit operates on the cleaned data to normalize amplitude levels. This sequential approach ensures that amplitude adjustment is performed on pure voice signals, achieving accurate normalization without amplifying noise.
Data Source
AI summary
A voice recognition device includes a voice recognition dictionary in which a word which is recognized as a result of voice recognition on an inputted voice is registered, a reply voice data storage unit for storing recorded voice data about words registered in the voice recognition dictionary, a dialog control unit for, when a word registered in the voice recognition dictionary is recognized, acquiring recorded voice data corresponding to the word from the reply voice data storage unit, a reproduction noise reduction unit for carrying out a process of reducing noise included in the recorded voice data, an amplitude adjusting unit for adjusting an amplitude of the recorded voice data in which the noise has been reduced to a predetermined amplitude level, and a voice reproduction unit for reproducing a voice from the amplitude-adjusted recorded voice data.