Signal Generating Apparatus HRTF Panning Closed Space Localization
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Solution Overview
Problem
Existing signal generating technologies face challenges in achieving clear sound image localization in closed spaces, particularly due to the limitations of distance-based amplitude panning (DBAP) processing.
Innovation Solution
A signal generating apparatus that includes a processor configured to adjust the frequency characteristics of an audio signal based on a Head-Related Transfer Function (HRTF) corresponding to a target position of a virtual sound source, and to generate output signals for multiple loudspeakers while performing panning processing to adjust the level of each output signal based on the target position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance based amplitude panning (DBAP) processing is used to control sound image localization, then the sound can be localized based on distance, but the clarity of sound image localization deteriorates in a closed space
Solution Approach 1:
The patent changes the parameter used for sound image localization from distance-based amplitude adjustment to direction-based HRTF filtering. By using HRTF parameters (azimuth and elevation angles) instead of simple distance metrics, the system achieves clearer sound localization in closed spaces while maintaining adaptability across different environments.
Solution Approach 2:
The patent replaces the mechanical DBAP amplitude adjustment mechanism with a signal processing approach using HRTF filters. This substitution involves replacing distance-based amplitude panning with direction-based frequency characteristic adjustment, achieving superior localization clarity without requiring physical movement or complex spatial mechanisms.
2Ease of manufacture
If traditional DBAP processing is used, then the system is simple to implement, but the sound image localization clarity is insufficient in closed spaces
Solution Approach 1:
The patent introduces HRTF data as an intermediary element between the audio signal and the final output. This intermediary provides direction-based filtering that enhances localization clarity while maintaining implementation simplicity through standardized HRTF databases and filter coefficients, avoiding the need for complex real-time calculations.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing HRTF filter coefficients for various directions in a database. During operation, the system simply retrieves the appropriate pre-computed HRTF data based on the target direction, eliminating the need for complex real-time computations and maintaining ease of implementation while improving localization clarity.
Data Source
AI summary
A signal generating apparatus includes: a memory configured to store instructions; and a processor communicatively connected to the memory and configured to execute the stored instructions to function as: a first generator configured to generate a processed signal by adjusting frequency characteristics of an audio signal representative of a sound from a virtual sound source based on a Head-Related Transfer Function (HRTF) corresponding to a target position of the virtual sound source; and a second generator configured to: generate, based on the processed signal generated by the first generator, a plurality of output signals in one-to-one correspondence with a plurality of loudspeakers; and perform panning processing to adjust a level of each output signal of the plurality of output signals based on the target position.