Video Audio Output System Sound Image Localization
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Solution Overview
Problem
Conventional sound image localization techniques fail to accurately localize sound images at a desired height due to limitations in amplitude-frequency characteristics, leading to incongruity between video and audio presentations, especially when AV rack loudspeakers are placed under televisions, requiring complex installations and measurements.
Innovation Solution
A video and audio output system that separates acoustic signals into low-frequency and high-frequency components, using distinct loudspeakers for each frequency range to localize sound images at the television display height, with adaptive filtering and coefficient determination to optimize sound image localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound image localization control is performed using conventional techniques with AV rack loudspeakers placed under the television, then the sound image can be localized in the horizontal direction, but the sound image height cannot be accurately controlled to match the video display height
Solution Approach 1:
The invention divides the audio system into two distinct parts: AV rack loudspeakers placed under the television for horizontal sound image localization, and television-built-in loudspeakers for vertical sound image localization. This segmentation allows each component to specialize in a specific dimension, with the AV rack handling horizontal positioning and the television handling height positioning, thereby achieving accurate three-dimensional sound image localization that matches the video display height.
2Reliability
If the AV rack loudspeaker apparatus is placed on the floor under the television, then audio performance can be improved with high-quality loudspeakers, but the sound image becomes localized near the floor causing incongruity with the video image position
Solution Approach 1:
The invention transitions from two-dimensional horizontal sound image localization (conventional technique) to three-dimensional localization by adding the vertical dimension. The television-built-in loudspeakers emit sounds that create a virtual sound image at the television display height, while the AV rack loudspeakers handle horizontal positioning. This dimensional expansion resolves the incongruity between video and audio positions by enabling height-direction sound image localization.
3Ease of manufacture
If conventional sound image localization techniques are used, then the system can be implemented with existing equipment, but complex measurements and installations are required to achieve accurate localization
Solution Approach 1:
The television-built-in loudspeakers automatically emit sounds that contribute to sound image localization without requiring separate measurement or installation procedures. The system utilizes the existing television and its built-in loudspeakers, which already occupy the desired position, to perform the vertical localization function. This self-service approach eliminates the need for complex measurements and installations while achieving accurate sound image localization.
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 realistic sound localization at the same height as the video image, improving audio quality and simplifying installation by using existing loudspeaker configurations without additional space or wiring, while maintaining high sound quality across a wide frequency band.
Implementation Method 1
an acoustic signal output control section (12a) for separating an acoustic signal into a low-frequency acoustic signal and a high-frequency acoustic signal using filter sections
Implementation Method 2
loudspeakers convert electric signals outputted from the FIR filters 101a and 101b respectively into acoustic signals
Implementation Method 3
a sound image localization control technique that corrects a head-related acoustic transfer function (hereinafter referred to as an HR transfer function)
Implementation Method 4
for outputting an acoustic signal so as to localize a sound image of the acoustic signal at a predetermined position
Data Source
AI summary
An acoustic signal output control section extracts, from an acoustic signal, a low-frequency-component acoustic signal and a high-frequency-component acoustic signal. A sound image localization processing filter section performs a sound image localization process on the low-frequency-component acoustic signal. The low-frequency-component acoustic signal having been subjected to the sound image localization process is outputted from loudspeakers in an AV rack loudspeaker apparatus. A television sound image localization processing filter section performs a sound image localization process on the high-frequency-component acoustic signal. The high-frequency-component acoustic signal having been subjected to the sound image localization process is outputted from loudspeakers in a television via HDMI communication sections.