US5019902A
Expired / Lapsed
US
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Band width compressing/reproducing system with fields for different frequency components
Assignee: Toshiba Corp
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Filing: 1989-08-01
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Granted: 1991-05-28
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Expires: 2009-08-01
Abstract
Abstract At a time of band width compression, an input signal is separated into a horizontal high frequency component H and a horizontal low frequency component L by means of an LPF and an adder. The component H is subjected to in-frame averaging by an in-frame average circuit. The component L is delayed by one field by a field delay circuit which contains a component to provide smooth motion. The delayed output is added to the in-frame average output in one field by an adder. In the other field, a difference in the horizontal low frequency component between fields is attained by a field delay circuit and an adder. Accordingly, in one field a signal containing the component L and the component H subjected to in-frame averaging is attained. In the other field, a signal containing only the component L having gone through a process of obtaining the field-to-field difference is attained. At a time of band width reproduction, an input signal is output as it is in one field through two switch circuits. In the other field, the input sighnal is added to an input signal in the former field by a field delay circuit and an adder. The added output is transferred through a switch.
Inventors
- 👤 Seijiro Yasuki
- 👤 Kiyoyuki Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:56
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/015; H04N11/00; H04N11/24; H04N11/28; H04N19/00; H04N19/60; H04N19/63; H04N7/007
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
164 words
A bandwidth compressing/ reproducing system comprising: first signal output means for receiving a television signal of 2 : 1 interlace format, and outputting in one field a first signal consisting of full-bandwidth components of a horizontal transfer bandwidth of said received television signal; signal extracting means for extracting a horizontal low frequency component, having a bandwidth of a predetermined horizontal frequency or below, from said television signal; second signal output means for outputting, in an other field, a second signal consisting only of said horizontal low frequency component output from said signal extracting means; adding means for adding said first and second signals output from said first and second signal output means; and selection means for selecting said first signal from said first signal output means in said one field whereas selecting an added output from said adding means in said other field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 2
Dependent Claim
164 words
A bandwidth compressing/ reproducing system comprising: first signal output means for receiving a television signal of 2 : 1 interlace format, and outputting in one field a first signal consisting of full-bandwidth components of a horizontal transfer bandwidth of said received television signal; signal extracting means for extracting a horizontal low frequency component, having a bandwidth of a predetermined horizontal frequency or below, from said television signal; second signal output means for outputting, in an other field, a second signal consisting only of said horizontal low frequency component output from said signal extracting means; adding means for adding said first and second signals output from said first and second signal output means; and selection means for selecting said first signal from said first signal output means in said one field whereas selecting an added output from said adding means in said other field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 3
Dependent Claim
115 words
A bandwidth compressing apparatus comprising: first signal output means for receiving a television signal of 2 : 1 interlace format, and outputting in one field a first signal consisting of full-bandwidth components of a horizontal transfer bandwidth of said received television signal; signal extracting means for extracting from said television signal a horizontal low frequency component having a bandwidth of a predetermined horizontal frequency or below; and second signal output means for outputting, in an other field, a second signal consisting only of said horizontal low frequency component output from said signal extracting means; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 4
Dependent Claim
115 words
A bandwidth compressing apparatus comprising: first signal output means for receiving a television signal of 2 : 1 interlace format, and outputting in one field a first signal consisting of full-bandwidth components of a horizontal transfer bandwidth of said received television signal; signal extracting means for extracting from said television signal a horizontal low frequency component having a bandwidth of a predetermined horizontal frequency or below; and second signal output means for outputting, in an other field, a second signal consisting only of said horizontal low frequency component output from said signal extracting means; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 5
Dependent Claim
37 words
An apparatus according to claim 2, wherein said first signal output means outputs an in-frame average signal as a horizontal high frequency component having a bandwidth of said predetermined horizontal frequency or above of said first signal.
Claim 6
Dependent Claim
32 words
An apparatus according to claim 2, wherein said second signal output means outputs as said second signal a field-to-field difference signal representing a difference in said horizontal low frequency component between fields.
Claim 7
Dependent Claim
174 words
An apparatus according to claim 2, wherein said first output means comprises: first subtracting means for performing a subtraction between said television signal and said horizontal low frequency component output from said signal extracting means, to output a horizontal high frequency component having a bandwidth equal to or greater than said predetermined horizontal frequency; in-frame averaging means for subjecting a subtracted output of said first subtracting means to in-frame averaging; and adding means for adding an in-frame average output from said in-frame averaging means and said horizontal low frequency component of said one field output from said signal extracting means; and wherein said second signal output means comprises: delay means for delaying by one field said horizontal low frequency component of said one field output from said signal extracting means; and second subtracting means for performing a subtraction between a delayed output of said delay means and said horizontal low frequency component of said other field output from said extracting means, to thereby output said field-to-field difference signal of said horizontal low frequency component.
Claim 8
Dependent Claim
40 words
An apparatus according to claim 2, further comprising selection means for selecting said first signal from said first signal output means in said one field and selecting said second signal from said second signal output means in said other field.
Claim 9
Dependent Claim
202 words
A bandwidth-compressed added signal multiplexer comprising: signal dividing means for dividing a television signal of 2 : 1 interlace format having a first aspect ratio into a main signal having a second aspect ratio smaller than said first aspect ratio and an added signal attained by removing said main signal from said television signal; in-frame averaging means for subjecting to in frame averaging that component of said main signal from said signal dividing means which has a bandwidth equal to or greater than a first predetermined horizontal frequency; bandwidth compressing means for outputting in one field a first signal consisting of full bandwidth components of a horizontal transfer bandwidth of said added signal, and outputting in an other field a second signal consisting only of a horizontal low frequency component having a bandwidth below a second predetermined horizontal frequency of said added signal, to thereby bandwidth compress said added signal; first multiplexing means for frequency-multiplexing said first signal from said bandwidth compressing means with said main signal output from said in-frame average means; and second multiplexing means for multiplexing said second signal output from said bandwidth compressing means in an overscan region of said main signal output from said in-frame averaging means.
Claim 10
Dependent Claim
202 words
A bandwidth-compressed added signal multiplexer comprising: signal dividing means for dividing a television signal of 2 : 1 interlace format having a first aspect ratio into a main signal having a second aspect ratio smaller than said first aspect ratio and an added signal attained by removing said main signal from said television signal; in-frame averaging means for subjecting to in frame averaging that component of said main signal from said signal dividing means which has a bandwidth equal to or greater than a first predetermined horizontal frequency; bandwidth compressing means for outputting in one field a first signal consisting of full bandwidth components of a horizontal transfer bandwidth of said added signal, and outputting in an other field a second signal consisting only of a horizontal low frequency component having a bandwidth below a second predetermined horizontal frequency of said added signal, to thereby bandwidth compress said added signal; first multiplexing means for frequency-multiplexing said first signal from said bandwidth compressing means with said main signal output from said in-frame average means; and second multiplexing means for multiplexing said second signal output from said bandwidth compressing means in an overscan region of said main signal output from said in-frame averaging means.
Claim 11
Dependent Claim
113 words
A bandwidth reproducing apparatus comprising: adding means for adding, field by field, an input television signal of 2 : 1 interlace format including a first signal consisting of full-bandwidth components of a television horizontal transfer bandwidth in one field, and a second signal consisting only of a horizontal low frequency component below a predetermined horizontal frequency of said television horizontal transfer bandwidth in an other field; and selection means for selecting said input television signal in said one field and selecting an added output of said adding means in said other field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 12
Dependent Claim
113 words
A bandwidth reproducing apparatus comprising: adding means for adding, field by field, an input television signal of 2 : 1 interlace format including a first signal consisting of full-bandwidth components of a television horizontal transfer bandwidth in one field, and a second signal consisting only of a horizontal low frequency component below a predetermined horizontal frequency of said television horizontal transfer bandwidth in an other field; and selection means for selecting said input television signal in said one field and selecting an added output of said adding means in said other field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 13
Dependent Claim
25 words
An apparatus according to claim 8, wherein said second signal is a field-to-field difference signal representing difference in said horizontal low frequency component between fields.
Claim 14
Dependent Claim
33 words
An apparatus according to claim 8, wherein a horizontal high frequency component having a bandwidth equal to or greater than said predetermined horizontal frequency of said first signal is an in-frame average signal.
Claim 15
Dependent Claim
39 words
An apparatus according to claim 8, wherein said adding means comprises: delay means for delaying said input television signal by one field; and adding means for adding said input television signal and a delayed output of said delay means.
Claim 16
Dependent Claim
84 words
A band compressing method comprising the steps of: outputting a first signal consisting of full-bandwidth components of a television horizontal transfer bandwidth of an input television signal having an interlace format 2 : 1 in one field; outputting a second signal consisting only of a horizontal low frequency component below a predetermined horizontal frequency of said television horizontal transfer bandwidth in another field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 17
Dependent Claim
84 words
A band compressing method comprising the steps of: outputting a first signal consisting of full-bandwidth components of a television horizontal transfer bandwidth of an input television signal having an interlace format 2 : 1 in one field; outputting a second signal consisting only of a horizontal low frequency component below a predetermined horizontal frequency of said television horizontal transfer bandwidth in another field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 18
Dependent Claim
145 words
A bandwidth reproducing method comprising the steps of: outputting a horizontal low transfer component of each field of an input television signal for each field as a horizontal low frequency component having a bandwidth below a predetermined horizontal frequency of a television horizontal transfer bandwidth; outputting a horizontal high frequency component included in one field of said input television signal repeatedly field to field as a horizontal high frequency component having a bandwidth above said predetermined horizontal frequency; whereby said input television signal has an interlace format of 2 : 1, which includes a first signal comprising a full-bandwidth component of said television horizontal transfer bandwidth in one field and a second signal comprising only said horizontal low frequency component in an other field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
Claim 19
Dependent Claim
145 words
A bandwidth reproducing method comprising the steps of: outputting a horizontal low transfer component of each field of an input television signal for each field as a horizontal low frequency component having a bandwidth below a predetermined horizontal frequency of a television horizontal transfer bandwidth; outputting a horizontal high frequency component included in one field of said input television signal repeatedly field to field as a horizontal high frequency component having a bandwidth above said predetermined horizontal frequency; whereby said input television signal has an interlace format of 2 : 1, which includes a first signal comprising a full-bandwidth component of said television horizontal transfer bandwidth in one field and a second signal comprising only said horizontal low frequency component in an other field; wherein said predetermined horizontal frequency is such that said horizontal low frequency component contains a component necessary to provide smooth motion.
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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |