Apparatus and method for measuring sound field
US7769184B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2006 |
| Grant date | Aug 3, 2010 |
| Priority date | — |
| Expiry date | Apr 24, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/307
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sound field measurement apparatus includes a signal generating unit for outputting a burst signal, a driving unit for driving a speaker using the burst signal, a microphone for picking up an audio output from the speaker, an analog-digital converter for performing analog-digital conversion processing on an output signal from the microphone and outputting picked-up audio data, a filtering unit for performing filtering processing on the picked-up audio data, and an analyzing unit for determining a propagation time of the audio output from the speaker to the microphone in accordance with data output from the filtering unit. In this sound field measuring apparatus, the filtering unit is an IIR filter configured to filter the picked-up audio data forward and then backward along a time axis, or an IIR filter configured to filter the picked-up audio data backward and then forward along the time axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.