Converting a single-bit audio stream to a single-bit audio stream with a constant edge rate
US10418044B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2017 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Sep 15, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M5/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A single-bit audio stream can be converted to a modified single-bit audio stream with a constant edge rate while maintaining a modulation index of the original audio stream using direct mapping. With direct mapping, a pre-filter bank may be combined with a multi-bit symbol mapper to select symbols for the modified audio stream with a constant edge rate per symbol and the same modulation index as the original audio stream. The output of the pre-filter bank may be an audio stream with no consecutive full-scale symbols. Using the output of the pre-filter bank, a multi-bit symbol mapper may use the symbol selector to output a symbol with a constant edge rate per symbol and the same modulation index as the original signal. The symbols may be converted to an analog signal for reproduction of audio content using a transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.