EP0701368A2
Expired / Lapsed
EP
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Data rate conversion
Assignee: Discovision Associates
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Filing: 1995-08-22
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Granted: —
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Expires: 2015-08-22
Abstract
Abstract A method for converting frame data at a slower rate into field data at a faster rate in a video decoder comprises determining a basic field repetition rate such that a field is repeated an integer number of times in a frame period, calculating a ratio differential of the repetition rate by subtracting from the speed-up ratio of the faster to the slower rate, the ratio of the fields per frame period to the slower rate, comparing the ratio differential with the differential of the field repetition rate and adding or subtracting extra fields when the two are substantially at variance.
Inventors
- 👤 Adrian Philip Wise
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:38
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/253; H04N7/00; H04N7/01; H04N19/00; H04N19/40; H04N19/50; H04N19/587; H04N19/60; H04N19/61
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A method of converting frames of data received at a slower rate into fields of data generated at a faster rate, the method comprising: determining a basic integer number of repetitions of fields in a frame period; calculating a differential of the field repetition rate from the difference between the ratio of the faster to the slower rates and the ratio of the basic integer number of fields in the frame period to the slower frame rate; additionally repeating or deleting selected ones of the repeated fields, when the differential of the rate of repeating fields is substantially at variance with the calculated differential of the field repetition rate, to maintain the repetition of the fields at the faster rate.
Claim 2
Dependent Claim
29 words
A method as claimed in claim 1 in which the selected repetition rate is less than the faster field rate, the selected ones of the frames being additionally repeated.
Claim 3
Dependent Claim
30 words
A method as claimed in claim 1 in which the selected repetition rate is faster than the faster field rate, the selected ones of the repeated frames being additionally deleted.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 1, 2 or 3 in which the basic integer number of repetitions of fields in a frame period is 2.
Claim 5
Independent Claim
32 words
A method as claimed in any of claims 1 to 4 in which the calculation and addition or deletion of selected ones of the repeated fields is conducted according to Breshenham's algorithm.
Claim 6
Dependent Claim
125 words
Apparatus for converting frames of data received at a slower rate into fields of data generated at a faster rate, the apparatus comprising: means for determining a basic integer number of repetitions of fields in a frame period; means for calculating a differential of the field repetition rate from the difference between the ratio of the faster to the slower rates and the ratio of the basic repetition number of fields in the frame period to the slower frame rate; means for additionally repeating or deleting selected ones of the repeated fields, when the differential of the rate of repeating fields is substantially at variance with the calculated differentials of the field repetition rate, to maintain the repetition of the fields at the faster rate.
Claim 7
Dependent Claim
31 words
Apparatus as claimed in claim 6, including means for generating a repeat or delete frame signal for actuating the means for repeating or deleting the selected ones of the repeated frames.
References Cited (Backward Citations)
GB1394154A
Cited
US5212742A
Cited
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