Playback Audio Calibration for Creation-Environment Fidelity
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Solution Overview
Problem
Current audio equalization standards fail to accurately match the playback environment to the creation environment, leading to inconsistencies in audio fidelity, especially in digital transmission and non-cinema environments, where industry-standard curves do not account for the creator's intended frequency response.
Innovation Solution
A method is introduced where the playback system receives an audio program and a target response representing the desired creation environment characteristics, deriving correction settings to match the playback environment's response, applying these settings to ensure the audio is rendered according to the creation environment's specifications, using metadata or calibration signals to transmit the necessary equalization data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If industry-standard equalization curves (e.g., RIAA, X-curve) are applied for playback calibration, then compatibility with standardized media formats is improved, but accuracy in reproducing the creator's intended frequency response deteriorates
Solution Approach 1:
The system performs preliminary measurement of the playback environment's frequency response characteristics before reproduction, and pre-processes the audio signal with custom equalization settings derived from these measurements to compensate for environmental deviations, thereby achieving accurate reproduction without sacrificing standard format compatibility
Solution Approach 2:
The system dynamically adjusts equalization parameters based on measured playback environment characteristics, transforming fixed industry-standard curves into adaptive, environment-specific frequency response corrections while maintaining compatibility with standardized audio formats
2Ease of operation
If fixed equalization processing is applied based on media type, then ease of operation is improved, but manufacturing precision of audio reproduction deteriorates
Solution Approach 1:
The system performs self-measurement of the playback environment's frequency response characteristics and automatically generates custom equalization settings without requiring manual calibration, thereby maintaining ease of operation while achieving precision comparable to manual professional calibration
Solution Approach 2:
The system incorporates feedback from measured playback environment characteristics to automatically adjust equalization processing, creating a closed-loop system that maintains both operational simplicity and reproduction precision through continuous environmental adaptation
Data Source
AI summary
Embodiments are described for a method of rendering an audio program by receiving, in a renderer of a playback system, the audio program and a target response representing desired characteristics of the playback environment, deriving a playback environment response based on characteristics of the playback environment, comparing the target response to the playback environment response to generate a set of correction settings, and applying the correction settings to the audio program so that the audio program is rendered according to the characteristics of the target response. The target response may be based on audio characteristics in a creation environment.