Apparatus for converting a field frequency and a scanning line n

Details Apparatus for converting a field frequency and a scanning line n Apparatus for converting a field frequency and a scanning line n

1992-03-24

1993-12-28

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 701

Patent

active

052744477

ABSTRACT:
A television standards conversion includes circuitry for generating first and second clocks. Time-axis compression and field frequency conversion circuitry is provided for performing time-axis compression on a signal and converting a field frequency of the 625/50 television standards to a field frequency of the 525/60 television standards by writing a digitized component signal of 625/50 television standards into a first digital memory having only one output port with the first clock and reading the signal from said first digital memory with the second clock. Scanning line interpolation circuitry is provided for performing scanning line interpolation processing for converting odd/even field attribute and converting spatial positions of scanning lines on the signal compressed on the time axis and converted in field frequency. Time-axis expansion and scanning line number conversion circuitry is provided for expanding the signal on the time axis by writing the signal having interpolated scanning lines into a second digital memory with the second clock and reading the signal from the second digital memory with the first clock, and for converting the number of scanning lines to that of the 525/60 standard by scanning line decimation processing.

REFERENCES:
patent: 4240101 (1980-12-01), Michael et al.
patent: 4672442 (1987-06-01), Yamaguchi et al.
ITEJ Technical Report vol. 14, No. 32, pp. 1-6, (Jun. 1990).

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