Sound Field Encoder Orientation Microphone Selection
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Solution Overview
Problem
Stereo and multichannel microphone configurations often result in the loss of spatial information due to noise suppression processes, leading to a single, mono output signal that lacks spatial information during sound field encoding and reproduction.
Innovation Solution
A system and method that detects the orientation of a computing device relative to a sound field, selects appropriate microphones and audio transducers based on this orientation, and processes the received sound field with associated descriptive information to maintain or restore spatial information, potentially switching between stereo and mono outputs based on device orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise suppression processes are applied to stereo and multichannel microphone configurations, then noise performance is improved, but spatial information is lost resulting in mono output
Solution Approach 1:
The patent segments the sound field processing into multiple independent channels (front, rear, left, right) that are processed separately through noise suppression. Each channel maintains its spatial characteristics while benefiting from noise reduction, avoiding the conversion to mono output.
Solution Approach 2:
The patent adds an orientation dimension to the sound field processing by detecting device orientation and adjusting the sound field accordingly. This allows the system to maintain spatial information across different device orientations while applying noise suppression in the optimal configuration.
2Measurement precision
If device orientation is detected and microphones are selected based on orientation, then spatial information accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the microphone selection system universal by creating a mapping between different device orientations and optimal microphone configurations. The same orientation detection and selection logic works across various device types and orientations, reducing overall system complexity through standardization.
Solution Approach 2:
The patent performs preliminary orientation detection and microphone selection before sound field processing begins. By pre-configuring the optimal microphone set based on detected orientation, the system avoids complex real-time adjustments during processing while maintaining spatial accuracy.
3Manufacturing precision
If sound field is processed and encoded with descriptive information, then reproduction accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts only the essential descriptive information needed for accurate sound field reproduction (orientation, microphone configuration, spatial relationships) rather than processing and encoding all possible parameters. This selective extraction maintains reproduction accuracy while reducing processing time.
Data Source
AI summary
In a system and method for encoding a sound field the orientation of a computing device may be detected. Several orientation indications may be used to detect the computing device orientation. The detected orientation may be relative to a sound field that is a spatial representation of an audible environment associated with the computing device. Microphones associated with the computing device may be selected in order to receive the sound field based on the detected orientation. The received sound field may be processed and encoded with associated descriptive information.