Method and apparatus for normalizing DTMF messages from a cellular mobile station
US6151514A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1998 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Apr 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system for normalizing a Dual-Tone Multi-Frequency ("DTMF") tone is provided for use in a digital wireless telecommunications system. The normalization system has an electronic memory with normalization parameter variable that stores a redefinable value. A programmable DTMF tone generator circuit is coupled to the electronic memory. The tone generator circuit has an input terminal for receiving a DTMF message packet. A program, executable on the DTMF tone generator, normalizes the DTMF message packet by substituting the redefinable value of the parameter variable in the DTMF message packet such that a normalized DTMF tone is transmitted through an output terminal of the DTMF tone generator circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.