Mixing, coding and decoding devices and methods
US6438434B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1997 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | May 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S1/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A plurality of analog signals are subjected to a delta sigma modulation for conversion into respective bitstream data (PDM). The respective bitstream data are weighted for conversion into respective plural-bit PCM data, and then these plural-bit PCM data corresponding to the analog signals are added together. At that time, optional PCM to be mixed with the analog signals may also be added. PCM data resultant from the addition is then subjected to a delta sigma modulation for conversion into bitstream data. In this way, the mixed data is provided as one bitstream data. The mixed data can be coded as PCM data by performing a decimation process on the mixed data. The mixed data can also be provided as analog data by subjecting the mixed data to an analog low-pass filtering process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.