Circuit arrangement for automatically recognizing the line stand

Details Circuit arrangement for automatically recognizing the line stand Circuit arrangement for automatically recognizing the line stand

1996-11-26

1999-02-16

Lee, Michael

Television

Basic receiver with additional function

Multimode

348543, 348548, H04N 546

Patent

active

058726012

ABSTRACT:
A circuit arrangement for automatically recognizing the line number of a video sync signal in accordance with the 525 or 625 line standard, this circuit arrangement automatically generating a control signal corresponding to one of the relevant line numbers. To recognize the line number, a line counter (14) clocked with horizontal frequency pulses is provided, this line counter receiving the frame-frequency sync pulse signal as a reset signal. Moreover, a decoding stage (15) is arranged at the output of the line counter (14), which supplies a signal for changing the line standard hitherto used and a signal characterizing the corresponding line standard. In a subsequent signal evaluation circuit (16), these two signals are checked and a control signal either corresponding to the current line standard or to the new line standard is applied to the output (17).

REFERENCES:
patent: 4402011 (1983-08-01), Newton
patent: 4821112 (1989-04-01), Sakamoto et al.
patent: 4860098 (1989-08-01), Murphy
patent: 4985770 (1991-01-01), Nagashima et al.
patent: 5111160 (1992-05-01), Hershberger

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