Method and circuit for improving the polar response of a two-way horn-loaded loudspeaker system
US5784474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1994 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Nov 10, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and correction circuit for improving and controlling the listening window and response of a two-way loudspeaker system utilizing a horn-loaded high frequency driver. The correction circuit includes adjustable active all-pass and band-pass filters, in a specific arrangement, coupled with conventional cross-over filters to achieve a maximally flat amplitude and phase response acoustically throughout a preferred listening window. A spectrum analyzer measures the near-field responses of the individual and combined transducers while adjustments are made. A phase shifting circuit is included in the low frequency channel which results in improved near-field to far-field response consistency and significantly improves the subjective characteristics of the high frequency horn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.