Frame step-out detecting method for data transmission and system

Details Frame step-out detecting method for data transmission and system Frame step-out detecting method for data transmission and system

1990-06-26

1993-07-27

Beausoliel, Jr., Robert W.

Excavating

371 44, 371 45, 371 46, 375 17, G06F 1110

Patent

active

052316394

ABSTRACT:
A frame step-out detection method and apparatus capable of detecting any frame step-out without having to insert a frame sync pulse or any other additional data, especially when using data mapping, which is transparent to a 90.degree..times.n phase revolution of the input data. During operation input data is encoded and supplied alternately to a first or second mapping table. Each mapping table is transparent to a 90.degree..times.n (n is an integer) phase revolution of the data mapped through that table, but not transparent to a 90.degree..times.n phase revolution of data from the other table. The mapped data is modulated and transmitted to a demodulator. The demodulator generates a signal to select a first or second determination table, which corresponds with the selected first or second mapping table. The demodulated data is determined from the determination table. If an error occurs during data transmission, the wrong determination table will be selected (i.e. the determination table which does not correspond to the mapping table used), which will cause errors in the determination data. These errors are easily detected thereafter.

REFERENCES:
patent: 4583236 (1986-04-01), Kromer
patent: 4837766 (1989-06-01), Yoshida
patent: 4993046 (1991-02-01), Saito
patent: 5029185 (1991-07-01), Wei
patent: 5050191 (1991-09-01), No
patent: 5054036 (1991-10-01), Brownlie

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