Speaker Excursion Feedback for Multiband Bass Gain Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sound producing systems face limitations in optimizing sound quality and loudness, particularly in audible bass bands, due to restricted gain range and limited improvement in low frequency bands, leading to suboptimal performance.
Innovation Solution
A sound producing system that estimates speaker excursion using feedback current and voltage to adjust amplification gain and employs multi-band dynamic range control (MBDRAC) to optimize audio signal processing across different frequency bands, ensuring improved sound quality and loudness based on the speaker's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gain of the amplifying apparatus is automatically controlled according to the excursion of the speaker, then the speaker protection is improved, but the improvement space for low frequency band of the audio is limited
Solution Approach 1:
The patent divides the audio signal into multiple frequency bands (low frequency band, mid frequency band, high frequency band) and applies different gain control strategies to each band. The low frequency band gain is controlled based on speaker excursion characteristics, while other bands use different control methods, allowing optimized protection and performance for each frequency range independently
Solution Approach 2:
The patent implements dynamic gain adjustment where the gain for low frequency band is continuously adapted based on real-time speaker excursion measurements. The system dynamically determines the maximum allowable gain based on current excursion conditions, enabling the gain to vary over time to both protect the speaker and maximize audio output within safe limits
2Reliability
If the range of the gain for amplifying the audio is limited, then the speaker excursion is controlled, but the sound quality and loudness optimization is restricted
Solution Approach 1:
The patent applies different quality control strategies to different frequency bands. The low frequency band gain is specifically controlled based on speaker excursion to protect the speaker, while other frequency bands are allowed greater gain range for optimized sound quality and loudness. This localized approach allows each band to have optimal characteristics without compromising the other
Solution Approach 2:
The patent changes the gain parameter dynamically based on speaker excursion conditions. By monitoring excursion and adjusting the gain parameter in real-time, the system maintains speaker protection while enabling sound quality optimization through adaptive parameter adjustment rather than fixed limitations
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The invention provides one sound producing system including a speaker, a driving circuit and an audio controller. The speaker is used for producing an audible sound. The driving circuit is connected to the speaker. The audio controller is configured to receive an input audio signal and pre-amplify the input audio signal with an amplify gain to obtain a pre-amplified audio signal; operate a multiband dynamic range control on the pre-amplified audio signal to obtain an output audio signal; convert the output audio signal to a driving voltage; provide the driving voltage to the speaker through the driving circuit; detect over the driving circuit to obtain at least one excursion parameter to determine an estimated excursion of the speaker in response to the driving voltage; and adjust the amplify gain according to the estimated excursion.