Signal separator for separating teletext bit sequences from a br

Details Signal separator for separating teletext bit sequences from a br Signal separator for separating teletext bit sequences from a br

1991-08-26

1993-06-08

Oberley, Alvin E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 94, H04N 704

Patent

active

052184374

ABSTRACT:
A signal separator, particularly a teletext-signal separator, includes an integrating unit which delivers a center-of-bit-indicating (i.e., center-crossing) signal and a residual-value signal. A residual-value-signal-evaluating device evaluates the respective residual value and uses a selection control signal to determine how the value of the current signal bit is to be estimated. This is accomplished by using a selection facility which derives from the current sample value and the preceding and subsequent sample values the respective preaverage value and postaverage value and selects the value best suited for the estimation using the selection control signal. A phase corrector evaluates a signal pattern from an edge logic which indicates whether the current sample value is approaching an edge of the signal, and controls a change of the integration period if the residual-value signal lies within a predetermined residual value signal range.

REFERENCES:
patent: 4594516 (1986-06-01), Tokumitsu
patent: 4672639 (1987-06-01), Tanabe et al.
patent: 4673979 (1987-06-01), Kobo et al.
patent: 4768208 (1988-08-01), Cornett
patent: 4794626 (1988-12-01), Tanabe
H. Matsue, et al., "Teletext Equalizer LSI," 1988 International Conference on Consumer Electronics, Part 1, IEEE, No. 3, New York, N.Y., Aug. 1988.

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