Patent EP0233720A2 successfully refreshed from Google Patents.
EP0233720A2
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EP
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Television signal - standard converting apparatus
Assignee: Sony Corp
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Filing: 1987-01-30
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Granted: —
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Expires: 2007-01-30
Abstract
Abstract In a standard converting apparatus for converting a television signal of the high definition television standard, for example, into that of the NTSC standard, data of an odd field and an even field of the NTSC standard are developed from one field of data of the high definition television standard and stored into memories (5A, 5B). Thus stored data are consecutively read out to perform the reproduction of a still picture and slow reproduction. Because the reproduction of a still picture and the slow reproduction are done using one frame of data comprising odd and even fields, the picture is distinct. Also, since the odd and even fields are developed from one field data, double images are not reproduced even if movement in the picture occurs.
Inventors
- 👤 Tatsuya Kubota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:34
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N7/00; H04N7/01; H04N7/0135; H04N7/0125
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
A standard converting apparatus for converting a first video signal which accords to a first television standard into a second video signal which accords to a second television standard, characterised in that said converting apparatus comprises: first line number converting means (4A) supplied with the first video signal within one of odd and even fields according to the first television standard and for generating an odd-field video signal according to the second television standard; second line number converting means (4B) supplied with the first video signal within said one of odd and even fields according to the first television standard and for generating an even-field video signal according to the second television standard; first memory means (5A) for storing an output of said first line number converting means (4A); second memory means (5B) storing an output of said second line number converting means (4B); and memory control means (7, l5) for controlling write and read operations of said first and second memory means (5A, 5B) so that the video signals stored in said first and second memory means (5A, 5B) are sequentially read out.
Claim 2
Dependent Claim
184 words
A standard converting apparatus for converting a first video signal which accords to a first television standard into a second video signal which accords to a second television standard, characterised in that said converting apparatus comprises: first line number converting means (4A) supplied with the first video signal within one of odd and even fields according to the first television standard and for generating an odd-field video signal according to the second television standard; second line number converting means (4B) supplied with the first video signal within said one of odd and even fields according to the first television standard and for generating an even-field video signal according to the second television standard; first memory means (5A) for storing an output of said first line number converting means (4A); second memory means (5B) storing an output of said second line number converting means (4B); and memory control means (7, l5) for controlling write and read operations of said first and second memory means (5A, 5B) so that the video signals stored in said first and second memory means (5A, 5B) are sequentially read out.
Claim 3
Dependent Claim
72 words
A standard converting apparatus as claimed in claim l, wherein said memory control means (7, l5) includes write address generating means controlled by a synchronizing signal (HDHD) and a field identifying signal (HFID) of the first video signal according to said first television standard and read address generating means (l5) controlled by a synchronizing signal (NTHD, NFID) and a field identifying signal of the video signal according to said second television standard.
Claim 4
Dependent Claim
50 words
A standard converting apparatus as claimed in claim l or 2 and adapted to operate with first and second television signals wherein the number of lines within one field of said first television standard is more than twice the number of lines within one field of said second television standard.
Claim 5
Dependent Claim
23 words
A standard converting apparatus as claimed in claim 3, wherein said first television standard is HDVS and said second television standard is NTSC.
Claim 6
Dependent Claim
55 words
A standard converting apparatus as claimed in any one of the preceding claims, wherein each of said first and second line number converting means (4A, 4B) includes an interpolating filter (Figs. 3A, 3B) having plural delay circuits (lll-ll8, l02) for delaying a given signal for the duration of one line of said first television standard.
Claim 7
Dependent Claim
42 words
A standard converting apparatus as claimed in any one of the preceding claims, wherein said memory control means includes write-enable signal generating means (l03) for generating a write-enable signal supplied to write-enable terminals of said first and second memory means (5A, 5B).
Claim 8
Dependent Claim
40 words
A standard converting apparatus as claimed in any one of the preceding claims, wherein said memory control means (7, l5) includes selecting means (l8) for selecting one of outputs read out from said first and second memory means (5A, 5B).
Claim 9
Dependent Claim
50 words
Apparatus according to any one of the preceding claims wherein the first and second line number converting means (4A, 4B) are operative to convert lines from the same one of the odd and even fields of the first television signal to said odd and even fields of said second signal.
References Cited (Backward Citations)
No citation records indexed.
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