Audio Decoding Apparatus Signal Classification and Decoding Unit Selection
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Solution Overview
Problem
Conventional audio coding and decoding apparatuses lack a mechanism to transmit signal classification information to post-decoding units, leading to suboptimal processing of decoded signals, as they cannot determine whether the signal is a speech or audio signal effectively.
Innovation Solution
An audio decoding apparatus that identifies the appropriate decoding unit based on signal classification information transmitted from a signal processing unit, allowing for optimal decoding and post-processing of signals by selecting the corresponding decoding scheme, and an audio coding apparatus that classifies input signals and selects the appropriate coding unit for encoding based on signal properties and an index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If signal classification information is not transmitted to post-decoding units, then the apparatus structure remains simple, but the processing quality of decoded signals deteriorates
Solution Approach 1:
An information transmitting unit is introduced as an intermediary component that carries signal classification information from the decoding unit to the post-decoding signal processing unit. This mediator enables the processing unit to adapt its operation based on signal type without requiring complex integrated decision-making logic throughout the system.
Solution Approach 2:
Signal classification is performed in advance during the decoding stage, and the classification information is transmitted to guide subsequent processing. This preliminary classification allows post-decoding units to optimize their processing based on known signal characteristics before processing begins.
2Device complexity
If a single coding scheme is used for all input signals, then the device complexity is reduced, but the sound quality for specific signal types (speech or audio) deteriorates
Solution Approach 1:
The coding system is segmented into multiple specialized coding units: a speech signal coding unit optimized for speech signals and an audio signal coding unit optimized for audio signals. The signal classifying unit divides incoming signals into these categories, allowing each segment to be processed by the most appropriate coding scheme.
Solution Approach 2:
The coding scheme is made dynamic through the selecting unit, which automatically chooses between speech and audio coding schemes based on real-time signal classification. This dynamic adaptation allows the system to optimize processing for the current signal type without requiring manual configuration.
3Measurement precision
If signal classification and selective decoding are implemented, then the processing accuracy for different signal types is improved, but the device complexity increases
Solution Approach 1:
The decoding unit is designed with multi-functionality to perform both speech signal decoding and audio signal decoding capabilities. This universal decoding unit can handle multiple signal types without requiring separate dedicated decoders for each signal type, reducing overall system complexity.
Solution Approach 2:
The information transmitting unit serves as a simple intermediary that carries classification information without requiring complex processing. This mediator bridges the gap between the multi-functional decoding unit and the post-decoding processing unit, enabling coordinated operation with minimal added complexity.
Data Source
AI summary
An audio decoding apparatus comprises: a plurality of decoding units; a band replicating unit which processes a decoded signal obtained when a corresponding decoding unit decodes a coded signal, according to a scheme specified by transmitted information; and an information transmitting unit which transmits, to a signal processing unit, information identifying the corresponding decoding unit from among the plurality of decoding units.