Acoustic Signal Processing Apparatus for Vertical Sound Localization
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Solution Overview
Problem
Existing technologies face challenges in implementing sound image localization in the up-down direction using omnidirectional loudspeaker groups or high-cost sound bars.
Innovation Solution
An acoustic signal processing apparatus that employs frequency shift processing, modulation frequency control, and amplitude control to simulate a moving sound source, utilizing single-sideband (SSB) modulation and Doppler shift to create the illusion of sound source movement in the up-down direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an omnidirectional loudspeaker group is used to implement sound image localization in the up-down direction, then sound localization capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical approach of using multiple omnidirectional loudspeakers arranged in specific three-dimensional configurations with an electronic signal processing approach. By applying frequency shift processing and single-sideband modulation to acoustic signals played through horizontally arranged loudspeakers, the system achieves up-down direction sound image localization without requiring complex spatial loudspeaker arrangements.
Solution Approach 2:
The patent changes the frequency parameter of acoustic signals through frequency shift processing and single-sideband modulation. By modulating the frequency of sounds played through horizontally arranged loudspeakers, the system creates the perception of up-down direction sound movement, effectively achieving vertical sound image localization through frequency parameter manipulation rather than physical loudspeaker positioning.
2Measurement precision
If a sound bar with loudspeakers arranged toward a diagonally upward side is used, then sound image localization in the up-down direction is improved, but hardware cost increases
Solution Approach 1:
The patent replaces the expensive mechanical solution of sound bars with diagonally upward arranged loudspeakers with an electronic signal processing system. By using frequency shift processing and single-sideband modulation on signals played through simple horizontally arranged loudspeakers, the system achieves the same up-down direction sound localization effect at lower hardware cost and simpler manufacturing requirements.
Solution Approach 2:
The patent creates an auditory illusion that copies the effect of physically elevated sound sources. Through frequency modulation and single-sideband processing, the system synthesizes the perception of sound coming from upward directions using horizontally arranged loudspeakers, effectively copying the localization effect of expensive sound bar configurations without requiring the actual physical arrangement.
3Measurement precision
If frequency shift processing and single-sideband modulation are applied to acoustic signals, then sound image localization in the up-down direction is achieved, but signal processing complexity increases
Solution Approach 1:
The patent makes horizontally arranged loudspeakers perform the additional function of creating up-down direction sound image localization through signal processing. By applying frequency shift processing and single-sideband modulation to the acoustic signals, the existing loudspeaker system gains the capability to localize sound in the vertical direction, making the system multi-functional without adding physical components.
Solution Approach 2:
The patent introduces signal processing circuits as intermediaries between the acoustic signal source and the loudspeakers. These intermediary processing stages (frequency shift processing unit and single-sideband modulation unit) transform the acoustic signals in a way that enables up-down direction localization, acting as a bridge that converts simple horizontal loudspeaker arrangements into systems capable of vertical 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
Effectively implements sound image localization in the up-down direction using two omnidirectional loudspeakers, providing a cost-effective solution that simulates a moving sound source, enhancing the realism of sound localization.
Implementation Method 1
a frequency shift processing unit configured to perform single-sideband (SSB) modulation on a first acoustic signal in accordance with the first modulation frequency to generate a first modulated acoustic signal
Implementation Method 2
employes frequency shift processing, modulation frequency control, and amplitude control to simulate a moving sound source, utilizing single-sideband (SSB) modulation and Doppler shift to create the illusion of sound source movement in the up-down direction
Data Source
AI summary
According to an embodiment, an acoustic signal processing apparatus includes processing circuitry. The processing circuitry includes a modulation frequency control unit, frequency shift processing unit, and amplitude control unit. The modulation frequency control unit is configured to control a first modulation frequency based on velocity information indicating a velocity of a sound source. The frequency shift processing unit is configured to perform single-sideband (SSB) modulation on a first acoustic signal in accordance with the first modulation frequency to generate a first modulated acoustic signal. The amplitude control unit is configured to control an amplitude of the first modulated acoustic signal.