Audio Bandwidth Selector for Dynamic Bitrate Optimization
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Solution Overview
Problem
In audio signal processing for transmission, existing technologies face challenges in balancing audio bandwidth and coding distortion to optimize perceptual quality, especially when available bitrate is constrained, as the quality of the audio output device at the receiving end significantly impacts the trade-off between preserving high frequencies and increased distortion.
Innovation Solution
An audio signal processing device that adjusts the audio bandwidth based on the characteristics of the remote audio output device, using an audio bandwidth selector to set the audio codec parameters, thereby optimizing the trade-off between audio bandwidth and coding distortion by determining switching thresholds based on the output device quality and target bitrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If audio bandwidth is increased to preserve high frequencies, then perceptual quality is improved for high-quality output devices, but coding distortion increases and bitrate consumption rises
Solution Approach 1:
The patent dynamically changes the audio bandwidth parameter based on the characteristics of the output device and available bitrate. By adjusting the audio bandwidth parameter, the system optimizes the trade-off between preserving high frequencies and controlling coding distortion, thereby resolving the contradiction between perceptual quality and information loss.
Solution Approach 2:
The system makes the audio bandwidth dynamic rather than fixed. It adapts the audio bandwidth in real-time based on feedback about the output device quality and available bitrate, allowing the system to optimize perceptual quality while controlling distortion according to current conditions.
2Measurement precision
If audio bandwidth is increased to capture more frequencies, then audio quality is improved, but the required sample rate and bitrate increase
Solution Approach 1:
The patent dynamically adjusts the audio bandwidth parameter based on the available bitrate and output device characteristics. This allows the system to optimize audio quality within the constraints of the available bitrate, resolving the contradiction between quality and data quantity.
Solution Approach 2:
The system makes audio bandwidth dynamic, adapting it in real-time based on bitrate availability and device capabilities. This dynamic adjustment allows the system to provide high audio quality when bitrate permits while conserving bandwidth when resources are limited.
3Productivity
If aggressive coding is applied to reduce bitrate, then bitrate efficiency is improved, but coding distortion increases and perceptual quality deteriorates
Solution Approach 1:
The patent adjusts the audio bandwidth parameter based on available bitrate and output device characteristics. By optimizing this parameter, the system achieves efficient bitrate utilization while maintaining perceptual quality, resolving the contradiction between bitrate efficiency and quality.
Solution Approach 2:
The system dynamically adjusts coding parameters based on available resources and device capabilities. This allows the system to apply appropriate coding aggression levels - more aggressive when bitrate is limited and the device cannot reproduce high frequencies, and less aggressive when resources allow for higher quality.
4Quantity of substance
If audio bandwidth is reduced to lower sample rate, then bitrate consumption is reduced, but high frequency components are lost
Solution Approach 1:
The patent dynamically adjusts the audio bandwidth parameter based on available bitrate and output device characteristics. This allows the system to optimize the balance between bitrate consumption and preservation of high frequency components, ensuring that frequency loss only occurs when necessary and appropriate.
Data Source
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AI summary
An audio signal processing device comprises: an audio input configured to receive an audio signal to be coded; an audio codec configured to apply audio coding to the audio signal, thereby generating coded audio data, having an audio bandwidth, for transmission to a remote device; a network interface configured to receive from the remote device an indication of at least one characteristic of an audio output device of the remote device; and an audio bandwidth selector configured to set an audio bandwidth parameter of the audio codec based on the indication received from the remote device, thereby setting the audio bandwidth of the coded audio data in dependence on the at least one characteristic of the audio output device.