US4730223A
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Method of converting a digital data signal having a first length into a digital data signal having a second length
Assignee: Hitachi Ltd
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Filing: 1985-06-07
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Granted: 1988-03-08
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Expires: 2005-06-07
Abstract
Abstract A method of converting a digital video signal including first words each being composed of N 1 bits into a digital video signal which consists of second words each being composed of N 2 bits (N 2 <N 1 ) by separating each of the first words into a first portion which consists of the N 2 bits including a most significant bit and a second portion which consists of the remaining (N 1 -N 2 ) bits including a least significant bit, and storing the first portions of the first words and the second portions. Third words each of which consists of N 2 bits are then composed by sequentially arranging the second portions. A first group of words which represent converted digital image signal are composed by first portions, and a second group of words are composed by sequentially linking the third words. Each scanning line of a converted digital video signal is then composed by the second group of words sequentially arranged before or after the first group of words.
Inventors
- 👤 Shigeyuki Ikeda
- 👤 Morishi Izumita
- 👤 Seiichi Mita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:44
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/169; H04N19/184; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
222 words
A signal conversion method wherein a digital video signal which includes first words each including N 1 bits representing a value of one sample in a video image is converted into a digital video signal which includes second words each including N 2 bits (N 1 and N 2 being integers and N 2 <N 1 ) representing a value of one sample, comprising the steps of: separating each of said first words corresponding to each of a plurality of scanning lines into a first portion which includes said N 2 bits including a most significant bit and a second portion which includes the remaining (N 1 -N 2 ) bits including a least significant bit; storing said first portions of said first words in a first memory means; composing third words, each of which includes N 2 bits, by sequentially arranging at least one of said second portions of said first words; storing said third words in a second memory means; composing a first group of words by sequentially arranging said first portions of said first words stored in said first memory means; composing a second group of words by sequentially arranging said third words; and composing a converted digital video signal corresponding to one scanning line by sequentially arranging said second group of words before said first group of words.
Claim 2
Dependent Claim
222 words
A signal conversion method wherein a digital video signal which includes first words each including N 1 bits representing a value of one sample in a video image is converted into a digital video signal which includes second words each including N 2 bits (N 1 and N 2 being integers and N 2 <N 1 ) representing a value of one sample, comprising the steps of: separating each of said first words corresponding to each of a plurality of scanning lines into a first portion which includes said N 2 bits including a most significant bit and a second portion which includes the remaining (N 1 -N 2 ) bits including a least significant bit; storing said first portions of said first words in a first memory means; composing third words, each of which includes N 2 bits, by sequentially arranging at least one of said second portions of said first words; storing said third words in a second memory means; composing a first group of words by sequentially arranging said first portions of said first words stored in said first memory means; composing a second group of words by sequentially arranging said third words; and composing a converted digital video signal corresponding to one scanning line by sequentially arranging said second group of words before said first group of words.
Claim 3
Dependent Claim
41 words
A signal conversion method according to claim 1, further comprising the step of: displaying an image comprised of a plurality of said first groups of words, each of said first groups of words being contained in said converted digital video signal.
Claim 4
Dependent Claim
32 words
A signal conversion method according to claim 1, wherein each said first word is composed of at least 9 bits, and each said second word is composed of at least 8 bits.
Claim 5
Dependent Claim
30 words
A signal conversion method according to claim 1, wherein the steps of composing a first group of words and storing said first portions of said first words are executed simultaneously.
Claim 6
Dependent Claim
28 words
A signal conversion method according to claim 1, wherein the steps of composing said third words and arranging said second portions of said first words are executed simultaneously.
Claim 7
Dependent Claim
28 words
A signal conversion method according to claim 1, further comprising the step of: recording said converted digital video signal onto a recording medium in a video signal recorder.
Claim 8
Dependent Claim
40 words
A signal conversion method according to claim 6, wherein said video signal recorder is one of a video tape and disk recorder designed so as to record and reproduce said converted digital video signal with words composed of 8 bits.
Claim 9
Dependent Claim
223 words
A signal conversion method wherein a digital video signal which includes first words each including N 1 bits representing a value of one sample in a video image is converted into a digital video signal which includes second words each including N 2 bits (N 1 and N 2 being integers and N 2 <N 1 ) representing a value of one sample, comprising the steps of: separating each of said first words corresponding to each of a plurality of scanning lines into a first portion which includes said N 2 bits including a most significant bit and a second portion which includes of the remaining (N 1 -N 2 ) bits including a least significant bit; storing said first portions of said first words in a first memory means; composing third words, each of which includes N 2 bits, by sequentially arranging at least one of said second portions of said first words; storing said third words in a second memory means; composing a first group of words by sequentially arranging said first portions of said first words stored in said first memory means; composing a second group of words by sequentially arranging said third words; and composing a converted digital video signal corresponding to one scanning line by sequentially arranging said second group of words after said first group of words.
Claim 10
Dependent Claim
223 words
A signal conversion method wherein a digital video signal which includes first words each including N 1 bits representing a value of one sample in a video image is converted into a digital video signal which includes second words each including N 2 bits (N 1 and N 2 being integers and N 2 <N 1 ) representing a value of one sample, comprising the steps of: separating each of said first words corresponding to each of a plurality of scanning lines into a first portion which includes said N 2 bits including a most significant bit and a second portion which includes of the remaining (N 1 -N 2 ) bits including a least significant bit; storing said first portions of said first words in a first memory means; composing third words, each of which includes N 2 bits, by sequentially arranging at least one of said second portions of said first words; storing said third words in a second memory means; composing a first group of words by sequentially arranging said first portions of said first words stored in said first memory means; composing a second group of words by sequentially arranging said third words; and composing a converted digital video signal corresponding to one scanning line by sequentially arranging said second group of words after said first group of words.
Claim 11
Dependent Claim
41 words
A signal conversion method according to claim 8, further comprising the step of: displaying an image comprised of a plurality of said first groups of words, each of said first groups of words being contained in said converted digital video signal.
Claim 12
Dependent Claim
32 words
A signal conversion method according to claim 8, wherein each said first word is composed of at least 9 bits, and each said second word is composed of at least 8 bits.
Claim 13
Dependent Claim
30 words
A signal conversion method according to claim 8, wherein the steps of composing a first group of words and storing said first portions of said first words are executed simultaneously.
Claim 14
Dependent Claim
28 words
A signal conversion method according to claim 8, wherein the steps of composing said third words and arranging said second portions of said first words are executed simultaneously.
Claim 15
Dependent Claim
28 words
A signal conversion method according to claim 8, further comprising the step of: recording said converted digital video signal onto a recording medium in a video signal recorder.
Claim 16
Dependent Claim
40 words
A signal conversion method according to claim 13, wherein said video signal recorder is one of a video tape and disk recorder designed so as to record and reproduce said converted digital video signal with words composed of 8 bits.
Claim 17
Dependent Claim
231 words
A signal conversion method wherein a digital video signal which includes first words, each including N 1 bits representing a value of one sample in a video image is converted into a digital video signal which includes second words each including N 2 bits (N 1 and N 2 being integers and N 2 <N 1 ) representing a value of one sample, comprising the steps of: separating each of said first words corresponding to each of a plurality of scanning lines into a first portion which includes said N 2 bits including a most significant bit and a second portion which consists of the remaining (N 1 -N 2 ) bits including a least significant bit; storing said first portions of said first words in a first memory means; storing said second portions of said first words in a second memory means; composing third words, each of which includes N 2 bits, by sequentially arranging at least one of said second portions of said first words; composing a first group of words by sequentially arranging said first portions of said first words stored in said first memory means; composing a second group of words by sequentially arranging said third words; and composing a converted digital video signal corresponding to one scanning line by sequentially arranging said second group of words one of before and after said first group of words.
Claim 18
Dependent Claim
231 words
A signal conversion method wherein a digital video signal which includes first words, each including N 1 bits representing a value of one sample in a video image is converted into a digital video signal which includes second words each including N 2 bits (N 1 and N 2 being integers and N 2 <N 1 ) representing a value of one sample, comprising the steps of: separating each of said first words corresponding to each of a plurality of scanning lines into a first portion which includes said N 2 bits including a most significant bit and a second portion which consists of the remaining (N 1 -N 2 ) bits including a least significant bit; storing said first portions of said first words in a first memory means; storing said second portions of said first words in a second memory means; composing third words, each of which includes N 2 bits, by sequentially arranging at least one of said second portions of said first words; composing a first group of words by sequentially arranging said first portions of said first words stored in said first memory means; composing a second group of words by sequentially arranging said third words; and composing a converted digital video signal corresponding to one scanning line by sequentially arranging said second group of words one of before and after said first group of words.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |