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AUTOMATIC TIME CORRELATION/RESET FOR RECEIVERS WITH REAL TIME CLOCK

IP.com Disclosure Number: IPCOM000005787D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-06
Document File: 1 page(s) / 57K

Publishing Venue

Motorola

Related People

Tuan K. Nguyen: AUTHOR [+3]

Abstract

Cumulative time base error on real time clocks (RTC) with receiver units can be practically eliminated us- ing a simple group transmission. This feature can be activated by sending out minimal data (address only) for a reseuroundoff feature or address and data for a time setting feature. The reset feature, depending on the customer/system parameters, would round off seconds, minutes and/or hours upon receipt of the correlation signal. Depending on the accuracy of the RTC, the base station could send out as many correlation signals as required for a specified cumulative time base error.

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MOTOROLA Technical Developments Volume 9 August 1989

AUTOMATIC TIME CORRELATION/RESET FOR RECEIVERS WITH REAL TIME CLOCK

by Tuan K. Nguyen, Thomas J. Rollins, Nichols J. Warp

   Cumulative time base error on real time clocks (RTC) with receiver units can be practically eliminated us- ing a simple group transmission. This feature can be activated by sending out minimal data (address only) for a reseuroundoff feature or address and data for a time setting feature. The reset feature, depending on the customer/system parameters, would round off seconds, minutes and/or hours upon receipt of the correlation signal. Depending on the accuracy of the RTC, the base station could send out as many correlation signals as required for a specified cumulative time base error.

Displayed Time Round Hours Round Minutes Round Seconds

8:21:50 8:Oo:OO 8:20:00 8:22:00

   The time setting function would be useful for daylight savings times change, inter time zone travel, and chronograph applications. For portable RTC receivers this function would be extremely useful. Nationwide travelers never need to be concerned with time zone changes as this would automatically be compensated for by the local base station. If the RTC ceceiver is out of range for more than a specified amount of time, a flag could alert the user of possible RTC error greater than specified.

For stationary clocks (schools, hospitals, cities, office buildings, etc.. .) this feature would allow all clocks on the same system...