Speakerphone accessory for a portable telephone
US6636750B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1999 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Oct 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72442
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A speakerphone accessory (100) is provided for use with a portable telephone (102). The speakerphone accessory (100) has a high-level speaker assembly (222) that includes a transducer (500) coupled to first and second resonators (502, 504). The first and second resonators (502, 504) are designed so that the first resonator (502) is most efficient at a high frequency while the second resonator (504) has maximum response at a low frequency. The frequency ranges produced by the first and second resonators (502, 504) overlap to reproduce frequencies between the high and low frequencies. The high-level speaker assembly (222), therefore, provides an acoustic bandpass having improved response when compared to the response of the transducer (500) alone. In addition, the speakerphone accessory (100) has a housing (130) and porting structure which allows the accessory (100) and attached portable telephone (102) to be used in a variety of positions without obstructing sound generated by the high-level speaker assembly (222).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.