Method and apparatus for transmitting a plurality of different codes at a plurality of different frequencies
US6822603B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2000 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Apr 25, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C17/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An RF transmitter capable of transmitting a plurality of different codes at a plurality of different frequencies is set forth herein. The transmitter offers a new way of multiplexing inputs so that fewer controller I/O ports are needed to read or determine the state of a plurality of inputs. More particularly, the controller is capable of using one pin as both an input port and output port and determines the state of various inputs by detecting changes to the I/O pin. The multiple inputs connected to the controller pin are also connected to a pull down resistor and capacitor, and the controller can determine what state the inputs are in by detecting whether the pin input is at a logic high, low, or some state in between.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.