Scalable Encoder Signal Quality Phase Shift Correction
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Solution Overview
Problem
Conventional scalable coding schemes fail to account for unique characteristics of encoding apparatuses, leading to quality deterioration and inefficiency in decoded signals due to phase shifts caused by sampling frequency transformations.
Innovation Solution
The proposed solution involves an encoding apparatus with a configuration that includes frequency transforming, encoding, decoding, adjusting, delaying, and adding sections to generate and process residual signals, using impulse responses for adjustment, thereby canceling characteristics that affect the decoded signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If down-sampled input signal is encoded in the base layer, then sampling frequency transformation is achieved, but the phase of the decoded signal shifts and quality deteriorates
Solution Approach 1:
The patent applies preliminary action by calculating the impulse response in advance based on the encoding apparatus characteristics, and using this pre-calculated impulse response to adjust the decoded signal. This allows the phase shift issue to be compensated before it affects the final decoded signal quality.
Solution Approach 2:
The patent introduces an impulse response as an intermediary element that mediates between the decoded signal and the final output. By convolving the decoded signal with the impulse response, the harmful phase characteristics are corrected without directly modifying the encoding process.
2Device complexity
If conventional scalable coding is performed without considering encoding apparatus characteristics, then coding simplicity is maintained, but decoded signal quality deteriorates and coding efficiency of higher layers decreases
Solution Approach 1:
The encoding apparatus characteristics are analyzed and the impulse response is calculated in advance, allowing the adjustment to be applied systematically without complicating the overall scalable coding structure. This preliminary preparation enables quality improvement while maintaining coding efficiency.
Solution Approach 2:
The patent changes the parameter of the decoded signal by applying convolution with the impulse response. This parameter transformation corrects the phase characteristics and improves signal quality without fundamentally altering the scalable coding framework.
3Productivity
If the error between decoded signal and input signal is reduced, then coding efficiency is improved, but the encoding apparatus characteristics cause quality deterioration
Solution Approach 1:
The impulse response serves as an intermediary that corrects the decoded signal quality without affecting the encoding efficiency. By applying this adjustment in the decoding stage, the patent improves signal quality while maintaining the coding efficiency gains from scalable coding.
Solution Approach 2:
The patent implements a feedback mechanism where the decoded signal is adjusted based on the pre-calculated impulse response that accounts for encoding apparatus characteristics. This feedback loop ensures that quality deterioration is compensated while maintaining coding efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the quality of decoded signals and enhances coding efficiency by adjusting output signals to mitigate the impact of encoding apparatus characteristics.
Implementation Method 1
an adjusting section that adjust the first decoded signal by convolving the first decoded signal and an impulse response for adjustment use
Data Source
AI summary
An encoder generating a decoded signal with an improved quality by scalable encoding by canceling the characteristic inherent to the encoder and causing degradation of quality of the decoded signal. In the encoder, a first encoding section (102) encodes the input signal after down sampling, a first decoding section (103) decodes first encoded information outputted from the first encoding section (102), an adjusting section (105) adjusts the first decoded signal after up sampling by convoluting the first decoded signal after up sampling and an impulse response for adjustment, an adder (107) inverses the polarity of adjusted first decoded signal and adds the first decoded signal having the inverted polarity to the input signal, a second encoding section (108) encodes the residual signal outputted from the adder (107), and a multiplexing section (109) multiplexes the first encoded information outputted from the first encoding section (102) and the second encoded information outputted from the second encoding section (108).