Multi-Channel Audio Signal Classification Through LFE Layout Encoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing audio systems struggle to distinguish between different channel layouts, such as 5.1.2 and 7.1.0, in multi-channel audio signals, leading to inadequate representation of sound sources in home environments, particularly when height channels are required or not.
Innovation Solution
An electronic device processes multi-channel audio signals by transforming the LFE channel signal based on playback layout information, adding a preset signal or modulating it with a carrier signal to differentiate between channel layouts, and filtering the signal using low-pass and band-pass filters to determine appropriate output configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio systems receive multi-channel audio signals without channel layout distinction, then signal compatibility is improved, but sound representation accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-processing the audio signal at the transmitter side to embed channel layout information. The encoder determines whether height channels are present and applies appropriate processing (such as adding a preset signal or modulating with a carrier signal) before transmission, so that the receiver can accurately distinguish the channel layout without requiring complex analysis of the audio content itself.
2Device complexity
If audio systems process all multi-channel signals uniformly, then processing complexity is reduced, but channel layout differentiation capability is lost
Solution Approach 1:
The patent applies parameter changes by modifying specific parameters of the audio signal to encode channel layout information. The encoder changes the signal characteristics (such as adding a preset signal for 5.1.2 layout or modulating with a carrier signal) based on the detected channel layout, creating distinct signal parameters that enable the receiver to identify the layout type through simple parameter detection rather than complex analysis.
3Measurement precision
If channel layout information is embedded in audio signal, then layout differentiation precision is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing the channel layout encoding at the transmitter side before transmission. The encoder detects the channel layout and applies appropriate signal processing (adding preset signals or carrier modulation) in advance, so that the receiver only needs to perform simple detection of the embedded parameters rather than complex signal analysis, thereby achieving high precision with manageable complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate playback of multi-channel audio signals by distinguishing between channel layouts, ensuring proper representation of sound sources, including height channels when necessary, enhancing the immersive audio experience.
Implementation Method 1
output an audio according to a signal obtained by applying the LFE channel audio signal to a low-pass filter
Implementation Method 2
determine a channel layout for playing back the audio to be played back via the LFE channel, based on a signal obtained by applying the LFE channel audio signal to one or more band-pass filters
Data Source
AI summary
Provided is an electronic device that obtains playback layout information related to audio playback using a plurality of channels, obtains a first audio signal related to an audio to be played back via a low frequency effect (LFE) channel among the plurality of channels, obtains a second audio signal different from the first audio signal, by transforming the first audio signal based on the playback layout information, and transmits the second audio signal to an external device.