Variable-frequency sliding band equalization for controlling sealed loudspeaker excursion
US10911869B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2018 |
| Grant date | Feb 2, 2021 |
| Priority date | — |
| Expiry date | Apr 16, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and systems for generating a speaker feed for driving a sealed speaker, including: generating feedback indicative of excursion of the speaker; in response to the feedback, equalizing an input signal to generate the speaker feed, such that the speaker feed is equalized for driving the speaker with: a desired frequency response above the speaker's resonance frequency; and an at least substantially flat frequency response in a variable sub-resonance equalization band without exceeding the speaker's excursion limit, where the sub-resonance equalization band extends from the resonance frequency down to a variable cutoff frequency, and the cutoff frequency is determined in response to the feedback. The speaker feed is generated in a feedback-controlled filter configured to boost the input signal at frequencies in the sub-resonance equalization band, the boost having a sloping frequency-amplitude response whose slope is set to overcome or cancel the speaker's natural falloff in the speaker's spring-loaded region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.