Patent ID: 7369628

Claim:
A method for gaining time information from received, amplitude modulated time signals (X) including a plurality of time frames (T) of constant duration, said method comprising the following steps: a) scanning said received amplitude modulated time signals (X) to provide scanned values (X″), b) storing in a storing sequence said scanned values in a memory to provide stored scanned values, c) detecting from said stored scanned values amplitude changes (X 4 , X 5 ) in said time signal (X), d) measuring time durations (T 4 , T 5 ) of said amplitude changes (X 4 , X 5 ), e) comparing said time durations (T 4 , T 5 ) with a predetermined time duration (Δt) for distinguishing between first amplitude changes having a duration shorter than said predetermined time duration (Δt) and second amplitude changes having a duration longer than said predetermined time duration (Δt), and f) demodulating said second longer amplitude changes while excluding from demodulating said first shorter amplitude changes.