Signal Processing Apparatus Dynamic Bandwidth Determination
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Solution Overview
Problem
Existing audio and speech signal processing technologies face challenges in enhancing sound quality, particularly when dealing with wideband, super wideband, or full-band signals, as the actual input signal bandwidth often falls short of the supported bandwidth modes, leading to inefficient bit allocation and reduced sound quality.
Innovation Solution
A signal processing method and apparatus that determine a valid bandwidth based on encoding parameters such as bit-rate, sampling frequency, and bandwidth through a call condition negotiation process, and perform pre-processing or post-processing on the signal to optimize encoding and decoding, including noise removal and band extension techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wideband, super wideband, or full-band coding modes are used to support higher bandwidths, then the potential sound quality improves, but the actual sound quality deteriorates when the input signal bandwidth is narrower than the supported bandwidth due to inefficient bit allocation
Solution Approach 1:
The patent implements dynamic bandwidth determination by analyzing the actual input signal bandwidth and adaptively selecting the appropriate coding mode (narrowband, wideband, super wideband, or full-band). This dynamic adaptation ensures that the coding bandwidth always matches the input signal characteristics, optimizing bit allocation efficiency and sound quality for each specific scenario
Solution Approach 2:
The system changes the coding parameter (bandwidth mode) based on the detected input signal bandwidth. By converting the input signal to frequency domain and analyzing the valid bandwidth, the system selects the optimal coding mode that matches the signal characteristics, thereby improving both bit allocation efficiency and sound quality
2Manufacturing precision
If the coding bandwidth is increased to support wider bandwidth modes, then the potential audio quality improves, but the bit-rate consumption increases when the input signal does not utilize the full bandwidth
Solution Approach 1:
The patent applies partial action by determining the valid bandwidth of the input signal and selecting a coding mode that matches only the necessary bandwidth portion. Instead of always using the highest bandwidth mode (full-band), the system uses exactly the bandwidth needed for the current signal, thereby reducing unnecessary bit-rate consumption while maintaining optimal audio quality
Solution Approach 2:
The system dynamically adjusts the coding bandwidth based on the input signal characteristics. By continuously analyzing the frequency domain representation of the input signal and determining its valid bandwidth, the system adapts the coding mode to match the actual signal requirements, optimizing the trade-off between audio quality and bit-rate consumption
Data Source
AI summary
Provided are a signal processing method and apparatus for enhancing sound quality. The signal processing method performed by a signal transmitting apparatus includes determining, based on a plurality of parameters, a valid bandwidth so as to encode an input signal; performing pre-processing on the input signal, based on the valid bandwidth; and encoding the pre-processed input signal, based on the valid bandwidth, and the signal processing method performed by a signal receiving apparatus includes decoding a bitstream or a packet received via a transmission channel; determining a valid bandwidth, based on a plurality of parameters used in the decoding; and performing post-processing on a decoded signal, based on the valid bandwidth.