Voice Decoding Apparatus Reducing Nose Clogging Artifact
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Solution Overview
Problem
The MBE-type voice encoding system suffers from a 'nose clogging feeling' in decoded voices, which affects sound quality, despite providing stable quality and resistance to noise at low bit rates.
Innovation Solution
A voice decoding apparatus that includes an MBE-type decoder, a sampling converter, a non-linear components generator, and an adder, which converts and processes the decoded voice signal to introduce additional components in frequency bands lacking in the original signal, thereby reducing the 'nose clogging feeling' while maintaining sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MBE-type voice encoding system is used, then stable quality and noise resistance are provided at low bit rate, but the decoded voice produces a nose clogging feeling
Solution Approach 1:
The patent changes the sampling frequency parameter from the original first sampling frequency to a second sampling frequency that is higher than the first sampling frequency. This parameter change enables the generation of additional voice signal components in frequency bands that were previously unavailable, thereby reducing the nose clogging feeling while maintaining the stability provided by the MBE-type encoding system
Solution Approach 2:
The patent extends the frequency dimension by converting to a higher sampling frequency, which opens up new frequency bands (above the original Nyquist frequency) where additional components can be generated. This dimensional extension allows the system to add naturalness-enhancing components without interfering with the original encoded components
Data Source
AI summary
A voice decoding apparatus includes an MBE-type decoder, a sampling convertor, a non-linear components generator and an adder. The decoder decodes digital voice-encoded information to generate a first decoded voice signal. The convertor converts the first decoded voice signal to a second decoded voice signal with a higher sampling frequency. The generator performs a non-linear process to the first or second decoded voice signal to generate an additional voice signal with the same sampling frequency as the second decoded voice signal. The additional voice signal has components in a frequency band in which the first decoded voice signal has no component and continuing to another frequency band of the first decoded voice signal. The adder adds the second decoded voice signal to the additional voice signal.