Periodicity-Based Audio Encoding Gain Control Under Bit Constraints
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Solution Overview
Problem
Conventional techniques for encoding acoustic signals fail to simultaneously reduce quantization distortion and the number of bits in the integer signal code while maintaining efficient operation processing, especially when combining methods based on periodicity and non-periodicity.
Innovation Solution
The proposed solution involves processing the gain adjustment coder only for methods where the number of bits in the integer signal code is expected to be reduced, utilizing the gained gain in methods where bit reduction is not expected, thereby optimizing both quantization distortion and bit reduction under given bit constraints with minimal operation processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gain adjustment processing is applied in both encoding methods (based on periodicity and not based on periodicity), then quantization distortion is reduced, but operation processing complexity increases
Solution Approach 1:
The patent applies gain adjustment processing selectively - only in the encoding method based on periodicity - rather than in both methods. This partial application reduces operation processing complexity while still achieving quantization distortion reduction in the method where it is most effective, thereby resolving the contradiction between improving precision and reducing complexity.
2Manufacturing precision
If gain adjustment processing is applied to reduce quantization distortion, then the number of bits in integer signal code increases, but encoding precision improves
Solution Approach 1:
The patent changes the encoding parameter by selectively applying gain adjustment only in the periodicity-based encoding method. This parameter change allows the system to achieve improved encoding precision through gain adjustment while avoiding the bit increase that would occur if gain adjustment were applied in both encoding methods, thus resolving the contradiction between precision and bit quantity.
3Quantity of substance
If gain is determined to reduce the number of bits in integer signal code, then bit rate decreases, but quantization distortion increases
Solution Approach 1:
The patent applies different processing qualities to different encoding methods. By applying gain adjustment processing only in the periodicity-based encoding method (where it is most effective for bit reduction) and not in the non-periodicity method, the system achieves local optimization. This allows bit rate reduction without excessive quantization distortion, as each method uses the processing most suitable to its characteristics.
Data Source
AI summary
Between a method in which an integer signal code is obtained by using an encoding method based on periodicity and a method in which an integer signal code is obtained using an encoding method which is not based on periodicity using an index indicating a degree of periodicity of a sample sequence in a frequency domain, processing of a first coder is executed only in a method for which the number of bits of the integer signal code is expected to be reduced, and a gain obtained through the processing of the first coder in the method for which the number of bits of the integer signal code is expected to be reduced is utilized in a method for which the number of bits of the integer signal code is not expected to be reduced.