Remote response system and data transfer protocol
US5724357A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1994 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Jun 24, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H2201/70
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A wireless remote response system includes a base unit which retrieves user-entered responses from a plurality of remote response units, each of which is provided to a user. The base unit transmits a base data package over a wireless communication link to the plurality of remote response units, which decode the base packet and load into memory a portion of the decoded base package at each response unit. Each response unit examines the characters loaded into the memory and determines any character in the portion of the decoded base package that pertains to that particular response unit. Each remote response unit then processes any character that pertains to that particular response unit. Each bit of data exchanged between the base unit and the response unit is encoded as a particular time interval for at least one cycle of a periodic waveform by varying the time interval either between successive rising edges or between successive falling edges of the periodic waveform. Decoding is carried out by measuring the time intervals between rising edges or between falling edges of successive waveforms. It is then determined whether each measured time interval falls within one of at least tw…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.