Verification arrangement
AssigneeTelefonaktiebolaget L M Ericsson
InventorGeorg Gustaf Lennart Pettersson
Life of this patent
Estimating the term…
Abstract
A pulse pattern detector includes a local pulse pattern generator starting in response to an incoming signal impulse whether or not it is included in the pulse pattern to be detected. There is a number of timing circuits for measuring the time lapsed from each of the pulses in the locally generated pulse pattern and memory means for storing the measured value of all but the last timing circuit as soon as a signal impulse is received. Comparators are provided to compare the contents of the memory means to find if all the memory circuits have recordings equal to a state of the timing circuit in which case a signal is generated indicating that the desired pulse pattern is detected in the incoming pulse sequence.
Claims7
Arrangement for verification that a received sequence of signal pulses includes a certain pulse pattern consisting of N signal pulses distributed in a determined manner in time comprising a code pulse source for local production of said pulse pattern in response to a received signal pulse, a group of N-1 time measuring circuits which are arranged to be started by each one of the N-1 first locally produced pulses and a further time measuring circuit which is arranged to be started by the Nth locally produced pulse, memory means for storing the measuring values from said group of time measuring circuits during an initial part of each incoming signal pulse, and for reading the measuring values thus stored at least during the later part of each signal pulse, and, means for comparing the measuring values thus stored with the measuring values of the further time measuring circuit, and means for emitting a verification signal when the last mentioned time measuring circuit reaches a measuring value which is found in all the memory means.
Dependencies are inferred from the claim text.