Digital Audio Signal Processing for Subwoofer Impulse Response
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Solution Overview
Problem
Conventional methods to enhance subwoofer response in audio systems either result in limited impulse response due to lightweight materials or produce unwanted frequencies, reducing overall sound quality.
Innovation Solution
A digital signal processing system that combines L and R channel signals, detects impulse signals, multiplies and scales them, and adds the scaled signals back into the averaged signal to generate a resultant signal, effectively enhancing low-frequency audio without adding excess noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the weight of the speaker driver is reduced to improve impulse response, then the cone can travel back and forth faster, but expensive materials are required to construct a strong yet lightweight cone
Solution Approach 1:
The patent replaces mechanical modifications to the speaker driver with digital signal processing. Instead of physically modifying the cone or driver mechanics, the system processes the audio signal electronically to enhance impulse response characteristics, thereby avoiding the need for expensive lightweight materials while achieving the desired speed and responsiveness.
Solution Approach 2:
The patent changes the parameters of the audio signal itself rather than the physical properties of the speaker driver. By applying digital filtering and processing techniques to the input signal, the system achieves improved impulse response without altering the mass or material properties of the speaker components.
2Power
If treble frequencies of the incoming audio signal are increased to improve subwoofer response, then a larger driver produces more punch, but unwanted frequencies are produced in the subwoofer driver
Solution Approach 1:
The patent extracts and processes specific frequency components of the audio signal through digital filtering. By isolating and selectively enhancing desired frequency ranges while filtering out unwanted components, the system achieves improved subwoofer response without introducing harmful frequencies that would result from simply boosting treble content.
Solution Approach 2:
The patent introduces digital signal processing as an intermediary between the input audio signal and the subwoofer driver. This intermediary layer processes the signal to prepare it for optimal subwoofer reproduction, ensuring that only appropriate frequencies are amplified while unwanted frequencies are suppressed, thereby achieving punch without distortion.
Data Source
AI summary
Systems and methods of audio reproduction are described. In one embodiment, one or more processors can be configured, for example, to receive an L channel signal and an R channel signal, to combine the L channel signal and the R channel signal, to average the combined signal, to detect an impulse signal in the averaged signal, to multiply the impulse signal, to scale the multiplied impulse signal, and to add the scaled impulse signal to the averaged signal to form a resultant signal. Sound can be generated, for example, by speakers based on at least the resultant signal.