Speaker system
US4126204A · kind A · utility
16Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1977 |
| Grant date | Nov 21, 1978 |
| Priority date | — |
| Expiry date | Jan 31, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/2826
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a bass-reflex type speaker system, in which sound signal waves radiating from the back of a speaker within a cabinet are emitted out through a hollow duct while the phase of the sound signal wave is reversed, the improvement comprising at least one dividing plate secured within the hollow duct and disposed parallel to the longitudinal direction of the duct or a hollow pipe with a diameter smaller than that of the duct, the hollow pipe being coaxially disposed within the hollow duct where the pipe may be made of sound absorbing material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.