Display Speaker PEQ Bandwidth Extension for Center Sound Localization
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Solution Overview
Problem
When a display apparatus operates as a center speaker, it often causes issues with frequency characteristics correction, sound image localization, and matching between sound signals, leading to unbalanced acoustic characteristics and a shifted or misplaced sound image.
Innovation Solution
The display apparatus includes a communication interface, a display, and a processor that extends the frequency bandwidth of sound channels using a parametric equalizer (PEQ) to correct gain in middle and high frequency bands, ensuring the sound image is centered on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the speaker of the display apparatus operates as the center speaker and outputs sound signals in the normal case, then the sound signal can be output from the display apparatus, but frequency characteristics correction between speakers becomes problematic
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the frequency bandwidth and gain characteristics of sound channels based on the operating mode. When functioning as a center speaker, the system changes frequency parameters (extending bandwidth) and gain parameters (reducing middle and high frequency gain) to match the expected acoustic characteristics of a center speaker, thereby resolving the frequency characteristics correction problem while maintaining sound output capability
2Productivity
If the speaker outputs sound signals in the same manner as normal case, then the sound signal can be output, but center sound image localization becomes problematic
Solution Approach 1:
The system changes acoustic parameters by extending the frequency bandwidth and adjusting gain characteristics specifically for center speaker operation. This parameter modification ensures that the sound image is correctly localized to the center area of the display by matching the acoustic response expected from a center speaker configuration
3Productivity
If the speaker outputs sound signals normally, then sound can be output, but matching between sound signals from display apparatus and external audio system becomes problematic
Solution Approach 1:
The patent applies parameter changes by adjusting frequency bandwidth extension and gain reduction parameters to match the acoustic characteristics expected from a center speaker. This ensures proper matching between the display apparatus and external audio system by standardizing the frequency and gain parameters to compatible ranges
4Device complexity
If the display apparatus divides frequency bands and outputs to each speaker, then frequency distribution can be managed, but acoustic characteristics balance becomes negative
Solution Approach 1:
The system changes gain parameters by reducing the gain in middle and high frequency bands when operating as a center speaker. This parameter adjustment compensates for the frequency band division approach and maintains acoustic characteristics balance by ensuring proper amplitude relationships between different frequency channels
Data Source
AI summary
A display apparatus and a method for controlling the display apparatus are disclosed. The display apparatus includes: a communication interface comprising communication circuitry, a display, a plurality of speakers, and a processor, and the processor is configured to: control the communication interface to receive an acoustic content corresponding to a sound signal of a plurality of channels corresponding to a specified frequency bandwidth, extend a frequency bandwidth of at least one channel of the plurality of channels based on a specified parametric equalizer (PEQ), perform correction of reducing a gain in middle frequency and high frequency bands of at least one channel of the plurality of channels with the extended frequency bandwidth, and output each sound signal of the plurality of corrected channels to the plurality of corresponding speakers so that a sound image of the sound signal is formed in a center area of the display.