Patent US5168358A successfully refreshed from Google Patents.
US5168358A
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Video signal converting apparatus for converting hdtv signal into conventional tv signal
Assignee: Panasonic Holdings Corp
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Filing: 1991-06-07
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Granted: 1992-12-01
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Expires: 2011-06-07
Abstract
Abstract A video signal converting apparatus includes: an interpolating circuit for interpolating a non-sampling point from sampling points in a field for restoring an HDTV band-compressed by offset sub-sampling; a first delay element for delaying the interpolated signal by one field period and a second delay element for delaying an output of the first delay element by one field; a median-value selector for selecting a median-value signal from signals in three adjacent fields from the input and output of the two delay elements, and an adder for averaging the output of the first delay element and an output of the median-value selector. Alternatively, the first and second delay elements maybe disposed before the interpolating circuit rather than after the interpolating circuit. Furthermore, a time-access conversion circuit maybe disposed either before the interpolating circuit or after the adder.
Inventors
- 👤 Atsushi Ishizu
- 👤 Yoshio Seki
- 👤 Masaki Tokoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:05
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/015; H04N7/0152; H04N7/01; H04N7/0125
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A video signal converting apparatus comprising: an interpolating circuit for interpolating a non-sampling point from sampling points in a field for restoring a high definition television signal band-compressed by offset sub-sampling; a first delay element for delaying the interpolated signal by one field period; a second delay element for delaying an output of the first delay element by one field period; a median-value selector for selecting a median-value signal from signals in three adjacent fields from the input and output of the two delay elements, and an adder for averaging the output of the first delay element and an output of the median-value selector.
Claim 2
Dependent Claim
104 words
A video signal converting apparatus comprising: an interpolating circuit for interpolating a non-sampling point from sampling points in a field for restoring a high definition television signal band-compressed by offset sub-sampling; a first delay element for delaying the interpolated signal by one field period; a second delay element for delaying an output of the first delay element by one field period; a median-value selector for selecting a median-value signal from signals in three adjacent fields from the input and output of the two delay elements, and an adder for averaging the output of the first delay element and an output of the median-value selector.
Claim 3
Dependent Claim
44 words
A video signal converting apparatus of claim 1, wherein a time-axis conversion circuit for converting the number of scanning lines from the high definition television signal into a standard television signal of progressive scanning is disposed in an input stage of the interpolating circuit.
Claim 4
Dependent Claim
45 words
A video signal converting apparatus of claim 1, wherein a scanning line converting circuit for converting scanning lines of the standard television signal of progressive scanning into those of the standard television signal of interlace scanning is disposed in an output stage of the adder.
Claim 5
Dependent Claim
47 words
A video signal converting apparatus of claim 1, wherein the median-value selector compares levels of every two signals out of three input field signals, detects the median-value signal by level, and delivers the median-value signal by changing over the selector circuit depending on a result of detection.
Claim 6
Dependent Claim
142 words
A video signal converting apparatus comprising: a time-axis conversion circuit for converting a high definition television signal band-compressed by offset sub-sampling to a standard television signal of progressive scanning by changing the number of scanning lines; a first delay element for delaying the converted standard television signal by one field period; a second delay element for delaying an output of the first delay element by one field period; first, second and third interpolating circuits for interpolating non-sampling points from sampling points in a field for restoring sub-sampled signals in three adjacent fields from the input and output of the two delay elements; a median-value selector for selecting a median-value signal of signals of three adjacent fields from outputs of the three interpolating circuits, and an adder for averaging an output of the second interpolation circuit and an output of the median-value selector.
Claim 7
Dependent Claim
142 words
A video signal converting apparatus comprising: a time-axis conversion circuit for converting a high definition television signal band-compressed by offset sub-sampling to a standard television signal of progressive scanning by changing the number of scanning lines; a first delay element for delaying the converted standard television signal by one field period; a second delay element for delaying an output of the first delay element by one field period; first, second and third interpolating circuits for interpolating non-sampling points from sampling points in a field for restoring sub-sampled signals in three adjacent fields from the input and output of the two delay elements; a median-value selector for selecting a median-value signal of signals of three adjacent fields from outputs of the three interpolating circuits, and an adder for averaging an output of the second interpolation circuit and an output of the median-value selector.
Claim 8
Dependent Claim
43 words
A video signal converting apparatus of claim 5, wherein a converting circuit for converting scanning lines of the standard television signal of progressive scanning to those of a standard television signal of interlace scanning is disposed in an output stage of the adder.
Claim 9
Dependent Claim
128 words
A video signal converting apparatus comprising: an interpolating circuit for interpolating a non-sampling point from sampling points in a field for restoring a high definition signal band-compressed by offset sub-sampling; a first delay element for delaying the interpolated signal by one field period; a second delay element for delaying an output of the first delay element by one field period; a median-value selector for selecting a median-value signal of three adjacent fields from the input and output of the two delay elements; an adder for averaging the output of the first delay element and an output of the median-value selector, and a time-axis conversion circuit for converting the number of scanning lines and aspect ratio simultaneously from an output signal of the adder to the standard television signal.
Claim 10
Dependent Claim
128 words
A video signal converting apparatus comprising: an interpolating circuit for interpolating a non-sampling point from sampling points in a field for restoring a high definition signal band-compressed by offset sub-sampling; a first delay element for delaying the interpolated signal by one field period; a second delay element for delaying an output of the first delay element by one field period; a median-value selector for selecting a median-value signal of three adjacent fields from the input and output of the two delay elements; an adder for averaging the output of the first delay element and an output of the median-value selector, and a time-axis conversion circuit for converting the number of scanning lines and aspect ratio simultaneously from an output signal of the adder to the standard television signal.
Claim 11
Dependent Claim
146 words
A video signal converting apparatus comprising: a first delay element for delaying a high definition television signal band-compressed by offset sub-sampling by one field period; a second delay element for delaying an output of the first delay element by further one field period; first second, and third interpolating circuits for interpolating non-sampling points from sampling points in a field for restoring sub-sampled signals of three adjacent fields from the input and output of the two delay elements; a median-value selector for selecting a median-value signal of the signals of the three adjacent fields from outputs of the three interpolating circuits; an adder for averaging an output of the second interpolating circuit and an output of the median-value selector, and a time-axis conversion circuit for converting the number of scanning lines and aspect ratio simultaneously from an output signal of the adder to the standard television signal.
Claim 12
Dependent Claim
146 words
A video signal converting apparatus comprising: a first delay element for delaying a high definition television signal band-compressed by offset sub-sampling by one field period; a second delay element for delaying an output of the first delay element by further one field period; first second, and third interpolating circuits for interpolating non-sampling points from sampling points in a field for restoring sub-sampled signals of three adjacent fields from the input and output of the two delay elements; a median-value selector for selecting a median-value signal of the signals of the three adjacent fields from outputs of the three interpolating circuits; an adder for averaging an output of the second interpolating circuit and an output of the median-value selector, and a time-axis conversion circuit for converting the number of scanning lines and aspect ratio simultaneously from an output signal of the adder to the standard television signal.
Claim 13
Dependent Claim
58 words
A video signal converting apparatus of claim 7 wherein the time-axis conversion circuit comprises a field memory circuit for writing and reading asynchronously, a write control circuit for sampling desired video data from the high definition television signal, and a read control circuit for reading out the written video data at a rate of the standard television signal.
Claim 14
Dependent Claim
58 words
A video signal converting apparatus of claim 8, wherein the time-axis conversion circuit comprises a field memory circuit for writing and reading asynchronously, a write control circuit for sampling desired video data from the high definition television signal, and a read control circuit for reading out the written video data at a rate of the standard television signal.
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) | 1995-12-01 | 1996-06-01 | 1996-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-01 | 2000-06-01 | 2000-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-01 | 2004-06-01 | 2004-12-01 | $7700.00 | Window Closed / Lapsed |