Two-Channel Audio Signal Segmentation for Virtual Center Channel
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Solution Overview
Problem
Modern motor vehicles equipped with only two acoustic output channels, typically a left and a right channel, struggle to achieve comparable stereo width without a center channel, posing a challenge in developing low-cost audio systems that provide comprehensive audio experiences.
Innovation Solution
A method that divides a stereo audio signal into three components based on perception direction, allowing these components to be mixed and output through a left and right channel, effectively creating a virtual center channel, with the center component being proportionally distributed between both channels, and dynamically weighted based on passenger compartment occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-channel audio system (left and right channels only) is used, then the device complexity and cost are reduced, but the stereo width and audio quality deteriorate
Solution Approach 1:
The audio signal is segmented into three directional components (left, center, right) using source separation algorithms. This segmentation allows the center component to be extracted and distributed to both left and right channels, effectively creating a virtual center channel without adding physical speakers. The signal processing divides the stereo field into distinct directional segments that can be independently controlled and optimized.
Solution Approach 2:
A signal processing unit acts as an intermediary between the audio source and the physical output channels. This intermediary processes the audio signal to create a virtual center channel by distributing the center component to both left and right output channels. The intermediary enables the system to simulate a three-channel configuration using only two physical channels, resolving the contradiction between channel count and stereo width.
2Manufacturing precision
If a center output channel is added to achieve better stereo width, then the audio quality improves, but the device complexity and cost increase
Solution Approach 1:
The center channel component is copied and distributed to both left and right output channels. Instead of requiring a separate physical center channel, the system creates virtual copies of the center signal that are mixed into the existing left and right channels. This copying approach maintains the stereo width benefits of a three-channel system while using only two physical output channels.
Solution Approach 2:
The left and right output channels serve multiple functions: they output their respective directional components and simultaneously carry the distributed center component. This multi-functionality allows the two physical channels to perform the work of three logical channels, achieving comprehensive audio coverage without increasing hardware complexity.
3Manufacturing precision
If the audio signal is processed to create directional components, then the stereo width is improved, but the processing complexity increases
Solution Approach 1:
The patent replaces physical mechanical expansion (adding a center speaker) with signal processing operations. Instead of mechanically adding hardware components to achieve stereo width, the system uses digital signal processing algorithms to create the perceptual effect of a center channel. This substitution of mechanical expansion with computational processing resolves the contradiction between achieving wide stereo imaging and maintaining system simplicity.
Data Source
AI summary
Method for outputting an audio signal (S) into an interior (4) forming part of a passenger compartment (2) in a motor vehicle (3) via an acoustic output device (7) comprising a left and a right acoustic output channel (5, 6), said method involving the steps of: - supplying an audio signal (S); - splitting the supplied audio signal (S) into a plurality of acoustic audio signal portions (S.1-S.3) that are dependent on the direction of perception; - mixing each acoustic audio signal portion (S.1-S.3) that is dependent on the direction of perception onto a right and/or a left output channel (5, 6) of an acoustic output device (7) comprising a right and a left acoustic output channel (5, 6); - outputting the acoustic audio signal portions (S.1-S.3) that are dependent on the direction of perception via the right and/or the left acoustic output channel (5, 6) of the acoustic output device (7).