Time base error corrector

Details Time base error corrector Time base error corrector

1986-05-15

1988-03-01

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 944

Patent

active

047290137

ABSTRACT:
A time base error corrector comprises a chrominance subcarrier phase corrector whereby the subcarrier phase of a video signal is controlled before being written in the buffer memory in such a way that when the video signal is read from the buffer memory on the basis of the reference video signal, the subcarrier phase of the read video signal may match that of the reference video signal. In the NTSC system, the succeeding line odd/even (O/E) identification is predicted on the basis of a content O/E of the preceding field identification and a content O/E of the preceding field top line identification, and a non-inverted return subcarrier signal is generated when the succeeding top line identification is determined to be odd but an inverted return subcarrier signal RSC is generated when determined to be even. In the PAL system, the succeeding line O/E odd/even and I/N inversion
on-inversion identifications are predicted to generate four different return subcarrier signals. The above control is effective when a VTR is servo-controlled in such a way that the reproduced video signal is written in the buffer memory in advance of the reference video signal in phase.

REFERENCES:
patent: 4101926 (1978-07-01), Dischort
patent: 4145705 (1979-03-01), Yoshinaka
patent: 4178607 (1979-12-01), Mikado
patent: 4212027 (1980-07-01), Lemoine
patent: 4646136 (1987-02-01), Kouyama

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