Encrypted 1-bit audio distribution system
US11451526B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2020 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Mar 9, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2201/003
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An innovative system for transmitting encrypted 1-bit audio over an Ethernet network comprises using an omni-directional micro-electrical-mechanical system acoustic sensor element (11) to provide an analog input signal (33) to a sigma-delta modulator (12) which then creates a pulse density modulated 1-bit data stream (32), at an audio oversampling rate, to a first input of a first exclusive-or (XOR) logic gate (58). The second input of the XOR logic gate is simultaneously presented with a first pseudo-random 1-bit data stream (78), at the same audio oversampling rate, thereby resulting in an encrypted pulse density modulated (PDM) 1-bit data stream (73) at the output of the XOR logic gate. The encrypted PDM 1-bit data stream is clocked into a first-in first-out (FIFO) memory at the audio oversampling rate and is clocked out of the first FIFO memory as Ethernet PDM frame data packages (74) at a predetermined Ethernet PHY transfer rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.