Audio File Playing Method Expanding Sound Field
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Solution Overview
Problem
Current methods for playing audio files on multiple mobile devices only increase volume and do not effectively expand the audio sound field, as they typically use mono or stereo files without converting them into multichannel formats in real time.
Innovation Solution
An audio file playing method that acquires and processes audio channel signals using joint covariance matrix coefficients and angles to generate matching audio channel signals, allowing multiple devices to play a multichannel audio file by converting stereo or mono files into appropriate channels, such as left, right, center, and rear channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple mobile devices play a mono or stereo audio file, then the audio volume is increased, but the audio sound field cannot be expanded
Solution Approach 1:
The patent transforms the audio signal parameters by converting mono or stereo audio files into virtual multichannel signals through matrix conversion. The system calculates covariance matrices and eigenvalues to generate artificial spatial audio parameters, enabling sound field expansion without requiring original multichannel audio files.
Solution Approach 2:
The patent adds spatial dimensions to the audio experience by creating virtual surround sound channels from limited input channels. Through mathematical transformation, it generates additional audio dimensions (front, rear, left, right channels) that simulate a three-dimensional sound field environment.
2Quantity of substance
If multiple mobile devices play different audio channel signals of a multichannel audio file, then the audio channel quantity is increased, but the original audio file must already be multichannel
Solution Approach 1:
The patent creates a universal audio processing system that can handle mono, stereo, and multichannel audio files uniformly. The matrix conversion algorithm automatically adapts to different input channel configurations, making the system compatible with various audio file types while outputting virtual multichannel signals.
Solution Approach 2:
The system dynamically changes the audio signal parameters through real-time matrix conversion. By calculating covariance matrices and eigenvalues from the input signal, it transforms the signal into virtual multichannel format, enabling channel quantity increase regardless of the original file format.
3Adaptability or versatility
If stereo or mono audio files are converted into multichannel audio files in real time, then the audio sound field is expanded, but the processing complexity increases
Solution Approach 1:
The patent pre-calculates and stores conversion matrices based on covariance analysis. By preparing the transformation parameters in advance through eigenvalue decomposition of covariance matrices, the system reduces real-time computational burden while maintaining high-quality sound field expansion.
Data Source
AI summary
An audio file playing method and an apparatus are disclosed and are used to: when an audio file is played, expand a quantity of audio channel signals in the audio file and improve a playing effect of the audio file. The method is as follows: after the audio file is obtained, determining, whether the audio file includes an audio channel signal that can be played by the mobile device; if the audio file includes the audio channel signal that can be played by the mobile device, directly playing the audio channel signal. Therefore, when multiple mobile devices are used to play a same audio file, the mobile devices can avoid performing a same operation, thereby increasing a quantity of audio channels of the audio file, expanding a sound field of the audio file, and improving a playing effect of the audio file.