NCJ Number
29397
Journal
Security World Volume: 12 Issue: 8 Dated: (SEPTEMBER 1975) Pages: 22-23,51
Date Published
1975
Length
3 pages
Annotation
EXPLANATION OF A CONTROLLED ACCESS SYSTEM INCORPORATING A MICROMINIATURIZED RADIO FREQUENCY TRANSMITTER AND RECEIVER.
Abstract
THE RECEIVER CIRCUITS ACCEPT A CODED SEQUENCE OF FIVE RADIO FREQUENCY PULSES FROM THE TRANSMITTER CONTAINED IN THE CASE CARRIED BY THE PERSON SEEKING ACCESS. THE PULSES ARE ALL THE SAME FREQUENCY, BUT EACH PULSE HAS ITS OWN SPECIFIC LENGTH, OR TIME DURATION, AS DETERMINED BY THE CODING CIRCUITS IN THE TRANSMITTER.