Low-noise directional microphone system
US7409068B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2003 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Mar 8, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A low-noise directional microphone system includes a front microphone, a rear microphone, a low-noise phase-shifting circuit and a summation circuit. The front microphone generates a front microphone signal, and the rear microphone generates a rear microphone signal. The low-noise phase-shifting circuit implements a frequency-dependent phase difference between the front microphone signal and the rear microphone signal to create a controlled loss in directional gain and to maintain a maximum level of noise amplification over a pre-determined frequency band. The summation circuit combines the front and rear microphone signals to generate a directional microphone signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.