Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1995-06-21
1996-06-18
Tse, Young T.
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375368, 370107, H04L 700, H03L 708
Patent
active
055286356
ABSTRACT:
A testing device is provided to test performance of transmission systems such as communication devices and transmission lines by transmitting and receiving specific patterns called pseudo-random patterns (i.e., PN patterns). A receiver unit of the testing device provides a synchronization detecting circuit. The synchronization detecting circuit comprises a pseudo-random-pattern creating circuit, a first coincidence detecting block, a second coincidence detecting block and an OR circuit. The first coincidence detecting block detects coincidence between a receiving-data input, a first detected-pattern input and a pseudo-random pattern created by the pseudo-random-pattern creating circuit so as to produce a first coincidence detecting signal. The second coincidence detecting block detects coincidence between the receiving-data input, a second detected-pattern input and the pseudo-random pattern so as to produce a second coincidence detecting signal. The first and second coincidence detecting signals are applied to the OR circuit, by which a synchronous detection signal is produced. Thus, synchronization between the receiving-data input and pseudo-random pattern is detected by the synchronous detection signal. Incidentally, each of the first and second detected-pattern inputs receives the pseudo-random pattern transmitted thereto through the transmission system; and the second detected-pattern input is delayed behind the first detected-pattern input by `m` bits (where `m` is an integer which is determined in advance).
REFERENCES:
patent: 4747116 (1988-05-01), Yajima et al.
patent: 4849995 (1989-07-01), Takeo et al.
patent: 5442405 (1995-08-01), Taniguchi et al.
Ando Electric Co. Ltd.
Nguyen Thuy-Lieu
Tse Young T.
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