Correction circuit and method for improving the transient behavior of a two-way loudspeaker system
US5377274A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1993 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Nov 22, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R29/003
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for improving the transient behavior of a two-way loudspeaker system includes a crossover circuit with high selectivity, amplitude and phase correction circuitry for separately correcting the amplitude and phase responses of the high and low frequency drivers in their mounting environment, and correction circuitry for correcting the composite amplitude and phase response of the overall loudspeaker system after insertion of the crossover. A further phase offset technique and circuit provides for introducing frequency dependent phase shift in the loudspeaker system's high or low frequency channels for offsetting the phase responses of the high and low frequency drivers within the crossover frequency range. According to the phase offset technique of the invention, phase shift is added, preferably in the high frequency channel, until composite amplitude response curves observed on-axis and at different vertical angles off-axis are forced to be consistent. After consistency is achieved the deterioration of the amplitude response resulting from the phase offset is corrected to a flat response by means of a forced series amplitude correction circuit inserted before the crossover…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.