Loudspeaker equalization
US4130727A · kind A · utility
16Cited by
2References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1977 |
| Grant date | Dec 19, 1978 |
| Priority date | — |
| Expiry date | Jun 29, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Variations in the amplitude-frequency response characteristic of a loudspeaker are compensated by a drive circuit in which an audio input signal is summed with a delayed signal derived from the input signal to provide a drive signal for the loudspeaker. The delayed signal is derived by discrete time filtering and may be formed by storing successively sampled values of the input or drive signal in either digital or analog form, and subsequently recalling the stored values in sequence, or by passing the input or drive signal through a series of all-pass phase-shift filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.