Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-03-29
1987-04-28
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358148, 358150, H04N 945
Patent
active
046618406
ABSTRACT:
An improved color television transmission compatible with NTSC standards produces a controlled horizontal scan rate at about 15,734 Hz with 227.5 cycles of color subcarrier per line, and a controlled vertical scan rate at about 59.940 Hz to produce frames of two interlaced fields each at a rate of about 29.970 Hz with 59,718.5 cycles of the color subcarrier per field, instead of 59,718.75, thereby eliminating "chroma crawl." The vertical scan rate is controlled by dividing a clock frequency of four times the color subcarrier by four to produce the color subcarrier, and dividing the clock frequency by some set of multiples to produce the horizontal and vertical scan rates with 227.5 cycles of color subcarrier per line and 59,718.75 cycles per field, and once every field, at the end thereof, skipping one cycle of the clock frequency in the generation of the horizontal and field sync pulses for the next field, thereby causing each field to have 59.718.5 cycles of the color subcarrier instead of the 59,718.75 cycles otherwise provided.
REFERENCES:
patent: 4268852 (1981-05-01), Nakamura
patent: 4278972 (1981-07-01), Wozniak
patent: 4295157 (1981-10-01), Machida
patent: 4500909 (1985-02-01), Machida
patent: 4517587 (1985-05-01), Aizawa
High Resolution Television, Inc.
Masinick Michael A.
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