Audio device and playback program for the same
US7650000B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2002 |
| Grant date | Jan 19, 2010 |
| Priority date | — |
| Expiry date | Aug 16, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S3/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The input signal X of one channel is divided by a multi-stage delay processing device Z−1 and each of the outputs is superimposed by a specified coefficient by a coefficient processing device W0, W1, . . . , Wk. The results are added by an adder, thereby providing a correlation eliminating filter for extracting a signal component from the input signal X of one channel having a high correlation with the input signal Y of the other channel. There is provided a coefficient updating processing device 5 for successively changing the feature of the correlation eliminating filter according to an error signal e obtained from the output signal RES and the input signal Y from the other channel, and the input signal X of one channel. A surround signal is obtained from a difference between the output RES from the correlation eliminating filter and the input signal Y of the other channel. Thus, upon reproduction of a two channels stereo signal, it is possible to generate a surround signal not giving uncomfortable feeling to a listener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.