Pulse or digital communications – Repeaters – Testing
Patent
1991-08-29
1993-09-07
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375106, H03K 704
Patent
active
052436268
ABSTRACT:
A method for clock synchronization for receiving pulse position encoded signals in which a clock signal defines slots or windows of time in which to receive pulse signals. The signal received within a slot is measured to obtain a value representing the amount of signal received within that slot. The values from adjacent slots are compared to determine into which slot the signal most fully fits, and to determine a clock correction value which would change the phase of the clock to make the slots more accurately center on the received pulses. During a time period in which clock adjustment will not affect received pulses, the clock correction value is applied to the clock. In a preferred form, the measurement of pulses, comparison between slots, and clock correction are all performed digitally. A list of energy values is maintained for all slots within a frame, so that the maximum energy value can be selected for assigning a pulse position to a slot within that frame.
REFERENCES:
patent: 3370126 (1968-02-01), Scidmore
patent: 4648133 (1987-03-01), Vilnrotter
patent: 4866738 (1989-09-01), Wiesmann et al.
patent: 5023888 (1991-06-01), Bayston
patent: 5031196 (1991-07-01), Bahlmann et al.
Devon Mark
Hingston Joseph W.
Aaker Mark
Apple Computer Inc.
Chin Stephen
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