Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1994-08-23
1996-12-31
Chin, Wellington
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
370509, 381 1, 371 471, 375340, H04L 700
Patent
active
055901611
ABSTRACT:
A transmitter for transmitting a low probability of detection rf signal, in which digitized audio data is contained therein. Each data frame contains deliberately introduced errors to synchronize a signal containing noise-like data due to skewing of an encoding frame and a data frame upon reception by a receiver.
Analog data is converted to digital form by an A/D converter, and then applied to a forward error correction device (FEC encoder) to properly encode the data. One block of input digital data associated with the A/D converter, and one block of input data for creating a codeword associated with FEC encoder are synchronized by a synchronization block, which determines a superframe that constitutes a common multiple of FEC encoder blocks and A/D converter blocks. The superframe is determined by a pulse output from the synchronization block, and that pulse is used to deliberately create one or more errors in the digital data output from the FEC encoder.
The error pattern is then detected by a receiver, which constantly monitors the received codewords for the error pattern, and uses the error pattern to synchronize the received input signal.
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Meyn William C.
Schneider Stanley
Chin Wellington
Luther William
Tektron Micro Electronics, Inc.
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