Signal Processing Apparatus for Wavefront Synthesis Low Frequency Reproduction
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Solution Overview
Problem
Existing wavefront synthesis technologies face challenges in reproducing audio signals without impairing low frequency components and in enabling flexible settings for audio signal output, particularly due to the limitations of small speaker diameters which can result in abnormal sound reproduction or lack of low frequency fidelity.
Innovation Solution
A signal processing system comprising a first speaker device with multiple small speakers and a second speaker device acting as a woofer, where the system includes an audio signal processing unit for wavefront synthesis, a filter processing unit to limit low frequencies, and a mix processing unit to enhance low frequency reproduction and allow for various settings, including gain and equalizer adjustments, to improve sound quality and output flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If wavefront synthesis processing is performed using only small-diameter speakers, then the speaker array can be compact and flexible in arrangement, but low frequency components are impaired and abnormal sound occurs
Solution Approach 1:
The system divides the audio reproduction function into two segments: small-diameter speakers handle high-frequency components while large-diameter speakers handle low-frequency components. This segmentation allows each speaker type to operate within its optimal frequency range, preventing abnormal sound while maintaining compact array flexibility.
Solution Approach 2:
Different speakers are assigned different frequency ranges based on their physical characteristics. Small-diameter speakers are localized for high-frequency reproduction, while large-diameter speakers are localized for low-frequency reproduction. This local quality assignment optimizes overall sound quality without requiring all speakers to be large.
2Device complexity
If all N-channel audio signals are output to the first speaker device, then the system configuration is simple, but flexibility in output settings is limited
Solution Approach 1:
The system provides dynamic output routing where N-channel audio signals can be flexibly directed to either the first speaker device, the second speaker device, or both simultaneously. This dynamic configuration allows users to adjust output settings based on different playback scenarios without complicating the basic system architecture.
3Reliability
If low frequency components are preserved in the entire sound field, then audio quality is improved, but small speakers produce abnormal sound
Solution Approach 1:
Low frequency components are extracted from the audio signals intended for small-diameter speakers and redirected to large-diameter speakers. This extraction prevents small speakers from reproducing frequencies they cannot handle properly, eliminating abnormal sound while preserving overall audio quality.
Solution Approach 2:
The signal processing apparatus acts as an intermediary between the audio source and speaker devices, selectively routing low frequency components away from small speakers and toward large speakers. This intermediary function resolves the conflict between maintaining audio quality and preventing abnormal sound.
Data Source
AI summary
A signal processing apparatus includes: an audio signal processing unit configured to perform wavefront synthesis processing for at least part of a plurality of sound source data; a first output unit configured to output N-channel audio signals output from the audio signal processing unit to a first speaker device; a mix processing unit configured to mix the N-channel audio signals output from the audio signal processing unit; and a second output unit configured to output an audio signal output from the mix processing unit to a second speaker device, in which a setting regarding an output of the second speaker device is possible.