Audio Coding Tonal Component Screening High Frequency Band
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Solution Overview
Problem
Current audio signal coding technologies face challenges in improving the quality of audio signal coding, particularly in efficiently encoding high frequency band signals to reduce the quantity of coded bits while maintaining effective tonal component representation.
Innovation Solution
The proposed solution involves an audio coding method that includes tonal component screening and bitstream multiplexing, where the high frequency band signal is processed to identify and encode target tonal components, using their location, quantity, and amplitude or energy information, and then multiplexing these parameters to create a coded bitstream, thereby improving coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional audio coding methods are used to encode high frequency band signals, then the coding process is simple, but the tonal component representation is insufficient and audio quality is degraded
Solution Approach 1:
The patent segments the high frequency band signal into individual tonal components using peak detection and screening. Each tonal component is identified by its frequency, amplitude, and temporal characteristics, allowing selective encoding of significant tonal elements rather than processing the entire spectrum uniformly. This segmentation improves tonal representation while managing complexity through targeted processing.
Solution Approach 2:
The patent transforms the audio signal from time-domain representation to frequency-domain parameters by extracting tonal component attributes (frequency, amplitude, temporal position). This parameter transformation enables efficient coding by representing complex waveforms with a small set of meaningful parameters that capture essential tonal characteristics, improving representation accuracy without proportionally increasing complexity.
2Manufacturing precision
If more coded bits are allocated to represent tonal components, then the tonal component representation improves, but the quantity of coded bits increases
Solution Approach 1:
The patent applies different coding strategies to different regions of the frequency spectrum based on local characteristics. Tonal components are identified and encoded with higher precision in regions where they occur, while non-tonal regions use coarser encoding. This localized approach allocates bits efficiently by concentrating resources on tonal components where they provide maximum perceptual benefit, improving tonal coding quality without uniformly increasing bit rate.
Solution Approach 2:
The patent encodes only the most significant tonal components that exceed certain amplitude and temporal thresholds, rather than attempting to encode all frequency components with equal detail. By focusing coding efforts on prominent tonal elements that have the greatest impact on perceived audio quality, the system achieves effective tonal representation with a limited number of coded bits, avoiding unnecessary encoding of insignificant components.
3Manufacturing precision
If tonal component screening is performed on high frequency band signals, then the tonal component coding effect improves, but the coding complexity increases
Solution Approach 1:
The patent performs preliminary tonal component screening and identification before the main encoding process. By detecting and marking significant tonal components in advance using peak detection and temporal continuity analysis, the system prepares a simplified representation that guides subsequent encoding steps. This preliminary action separates the complex task of tonal identification from the encoding process, improving overall coding effect while managing complexity through staged processing.
Data Source
AI summary
An audio coding method includes obtaining a current frame of an audio signal, where the current frame includes a high frequency band signal; coding the high frequency band signal to obtain a coding parameter of the current frame, where coding includes tonal component screening, the coding parameter indicates information about a target tonal component of the high frequency band signal, the target tonal component is obtained after tonal component screening, and information about a tonal component includes location information, quantity information, and amplitude information or energy information of the tonal component; and performing bitstream multiplexing on the coding parameter to obtain a coded bitstream.