Audio Reproducing Apparatus with Upper and Lower Speakers
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Solution Overview
Problem
Audio reproducing apparatuses with speakers at upper and lower positions in a room face challenges in maintaining a stable diffuse sound field when outputting stereo audio signals, leading to uncomfortable variations in sound distribution for listeners.
Innovation Solution
The apparatus includes an obtainment unit for stereo audio signals and a control unit that generates and adjusts audio signals for upper and lower speakers, using gain coefficients to balance the energy ratio between the two, ensuring a consistent sound field distribution by combining L and R channel signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If speakers at upper and lower positions output sound from stereo audio signals, then spatial sound coverage is improved, but sound field distribution becomes unstable
Solution Approach 1:
The patent dynamically adjusts the gain coefficient based on the correlation between L and R channel signals to maintain stable energy ratio. When correlation is high, gain is reduced to prevent excessive energy from upper speakers; when correlation is low, gain is increased to balance energy distribution. This parameter adjustment stabilizes the sound field distribution while maintaining comprehensive spatial coverage.
Solution Approach 2:
The system calculates the correlation between L and R channel signals in real-time and uses this feedback to adjust the gain coefficient for upper speaker output. This closed-loop control ensures that the energy ratio between upper and lower speakers remains balanced, preventing sound field distribution instability while maintaining wide spatial coverage.
2Stability of the object's composition
If gain coefficient is adjusted based on L-R channel correlation, then energy ratio stability is improved, but system complexity increases
Solution Approach 1:
The patent adjusts the gain coefficient as a dynamic parameter based on L-R channel correlation. This single parameter adjustment simplifies the control mechanism while effectively maintaining energy ratio stability, avoiding the need for complex multi-parameter control systems.
Solution Approach 2:
The system automatically calculates correlation and adjusts gain without requiring external intervention or complex user settings. The self-adjusting mechanism maintains energy balance through inherent signal analysis, reducing the need for additional control hardware or complex processing algorithms.
Data Source
AI summary
An audio reproducing apparatus includes: an obtainment unit configured to obtain a stereo audio signal including an L channel signal and an R channel signal; and a control unit configured to (i) generate a first audio signal for a speaker disposed at an upper position in a listening space and a second audio signal for a speaker disposed at a lower position in the listening space, using the L channel signal and the R channel signal and (ii) determine a gain coefficient corresponding to a degree of correlation between the L channel signal and the R channel signal and multiply by the determined gain coefficient at least one of the first audio signal and the second audio signal, to approximate a ratio between energy of sound reproduced from the first audio signal and energy of sound reproduced from the second audio signal to a predetermined value.