Sound masking system and masking sound generation method
US8050931B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2008 |
| Grant date | Nov 1, 2011 |
| Priority date | — |
| Expiry date | Aug 24, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K2203/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a masking sound generation apparatus, a CPU analyzes a speech utterance speed of a received sound signal. Then, the CPU copies the received sound signal into a plurality of sound signals and performs the following processing on each of the sound signals. Namely, the CPU divides each of the sound signals into frames on the basis of a frame length determined on the basis of the speech utterance speed. Reverse process is performed on each of the frames to replace a waveform of the frame with a reverse waveform, and a windowing process is performed to achieve a smooth connection between the frames. Then, the CPU randomly rearranges the order of the frames and mixes the plurality of sound signals to generate a masking sound signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.