Audio Processing and Transmission Encoding Low Bitrate
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Solution Overview
Problem
Multichannel audio systems require higher data rates for storage and transmission, leading to challenges in maintaining high-quality audio reproduction, especially in low-bitrate applications like Internet streaming and wireless transmission, where conventional coding methods often result in significant audio quality degradation.
Innovation Solution
The Audio Processing and Transmission (APT) system encodes an arbitrary number of audio source signals using a sinusoidal model to extract side information, which is then used to create a reference signal, allowing for efficient transmission and storage while maintaining high-quality audio playback, by modeling each audio source signal with respect to a derived reference signal and using sinusoidal parameters and spectral envelopes to reconstruct the original signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multichannel audio systems use higher data rates for storage and transmission, then audio quality is improved, but transmission requirements and storage demands increase
Solution Approach 1:
The patent extracts essential audio information from multichannel signals by separating them into a reference signal and side information. The reference signal contains the core audio content while side information contains parameters needed for reconstruction. This extraction allows transmitting only the essential data at low bitrates while maintaining audio quality.
Solution Approach 2:
The patent transforms the audio representation from time-domain signals to parameter-domain representations using sinusoidal models. By encoding audio as sinusoidal parameters (frequency, amplitude, phase) rather than raw waveform data, the system achieves efficient compression while preserving perceptual audio quality.
2Quantity of substance
If conventional coding methods are used in low-bitrate applications, then transmission requirements are reduced, but audio quality degradation increases
Solution Approach 1:
The patent performs preliminary analysis of the audio signals to identify and extract sinusoidal components and their parameters before encoding. By pre-processing the signals to separate predictable sinusoidal parts from residual noise, the system prepares the data in an optimal form for low-bitrate transmission that preserves audio quality.
Solution Approach 2:
The patent introduces a reference signal as an intermediary that carries the essential audio content. The side information acts as a mediator that provides parameters for reconstructing individual channel signals from the reference signal, enabling quality audio reproduction at low bitrates.
3Measurement precision
If side information is extracted for each source signal, then audio reconstruction accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent merges the processing of multiple audio channels by creating a single reference signal from all channels. Instead of processing each channel independently, the system combines them and uses a unified sinusoidal model, reducing processing complexity while maintaining reconstruction accuracy through shared side information.
Data Source
AI summary
This disclosure details the implementation of apparatuses, methods and systems for audio processing and transmission. Some implementations of the system are configured to provide a method for encoding an arbitrary number of audio source signals using only a small amount of (transmitted or stored) information, while facilitating high-quality audio playback at the decoder side. Some implementations may be configured to implement, a parametric model for retaining the essential information of each source signal (side information). After the side information is extracted, the remaining information for all source signals may be summed to create a reference signal from which noise information for the original source signals may be reconstructed. The reference signal and the side information form the new collection of information to be transmitted or stored for subsequent decoding.