Authorization control circuit and method
US7546636B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 2000 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Jun 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/66
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An authorization control circuit (10) comprises a digital signal processor (12) operable to provide digital data output, determine an authorization state, and generate a disable signal. A digital to analog converter (28,60) is coupled to the digital signal processor (12) and is operable to receive the digital data output. The digital to analog converter (28,60) generates analog data in response to the digital data output and is operable to output the analog data and mute the output of analog data. The digital to analog converter (28,60) includes an input (23,25,27,59) operable to receive the disable signal. The digital to analog converter (28,60) mutes the output of analog data in response to the disable signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.