GB2047040A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Scan converter for a television display
Assignee: SECR DEFENCE
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Filing: 1979-03-20
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Granted: —
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Expires: 1999-03-20
Abstract
Abstract A digital raster scan converter for converting elements of picture information available according to a first format to a second format suitable for display on a TV screen comprises a rectangular coordinate memory store (39) into which 1-bit video information according to the first format is written. The information from the store (39) is read out sequentially into three shift registers (61, 62, 63). An interpolation logic circuit (70) is connected to the last three bits of each of the three shift registers and is so arranged as to interpolate additional in-line and inter-line picture information to thereby provide a flicker- free display on a TV screen. The incoming information may be in polar coordinate form from a radar system. <IMAGE>
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 03:38
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0135; G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/295; G01S7/298; H04N7/0105
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
78 words
A digital raster scan converter for converting elements of picture information available according to a
first format to a second format suitable for display on a TV screen comprising a rectangular co-ordinate
memory store into which the information according to the first format can be written, means to read out the
information from said memory store in a raster manner and means to interpolate additional in-line and
inter-line information to provide a flicker-free display on a TV screen.
Claim 2
Dependent Claim
78 words
A digital raster scan converter for converting elements of picture information available according to a
first format to a second format suitable for display on a TV screen comprising a rectangular co-ordinate
memory store into which the information according to the first format can be written, means to read out the
information from said memory store in a raster manner and means to interpolate additional in-line and
inter-line information to provide a flicker-free display on a TV screen.
Claim 3
Dependent Claim
35 words
A digital raster scan generator as claimed in claim 1 wherein the means to interpolate comprises two
or more shift registers in which successive lines read out from said memory store can be temporarily stored.
Claim 4
Dependent Claim
42 words
A digital raster scan generator as claimed in claim 1 wherein the information according to the first
format is written into separate blocks in the memory store so that interpolation can be achieved by cyclically
addressing appropriate locations in the store blocks.
Claim 5
Dependent Claim
22 words
A digital raster scan generator according to any one of claims 1 to 3 wherein the picture information is
1-bit video information.
Claim 6
Dependent Claim
84 words
A digital raster scan generator according to claim 4 wherein the interpolation means for processing
1-bit video information comprises three shift registers connected in series wherein each register has a
capacity equal to one line of stored video information and an interpolation logic circuit is connected to nine
bits consisting of three adjacent bits in corresponding positions in each shift register such that the nine bits
represent a rectangular element of the field of view comprising a three by three matrix of picture elements.
Claim 7
Dependent Claim
90 words
A digital raster scan generator according to claim 5 wherein the interpolation logic circuit is arranged
so that "1"s corresponding to radar pulses are generated at intermediate positions on a line that can be
drawn through any three bits of said nine bits wherein said three bits are filled with radar pulses and
whenever there are only two adjacent bits of said nine bits filled with radar pulses, the interpolation logic is
arranged to cancel the said two adjacent pulses and to generate a "1" at the single intermediate point.
Claim 8
Dependent Claim
38 words
A radar system employing a digital raster scan generator according to any one preceding claim
wherein radar picture information in polar co-ordinates obtained from a rotatable directional antenna is
transformed into rectangular co-ordinates to provide said first format.
Claim 9
Dependent Claim
45 words
A radar system as claimed in claim 7 wherein the radar picture information is 1-bit video information
produced by applying the received radar signal to a discriminator whereby a radar signal pulse output is
produced whenever said received radar signal amplitude exceeds a predetermined value.
Claim 10
Dependent Claim
25 words
A radar system as claimed in any one of claims 6 to 8 wherein there is provided means to discriminate
against received clutter radar signals.
Claim 11
Dependent Claim
28 words
A radar system as claimed in claim 9 wherein the clutter signal is differentiated so that there is not a
complete loss of information from areas of clutter.
Claim 12
Dependent Claim
38 words
A radar system as claimed in any one of claims 8 to 10 wherein the 1-bit video information from
successive sweeps of the antenna is correlated to eliminate noise and interference signals which do not
correlate in range.
Claim 13
Dependent Claim
91 words
A radar system as claimed in any one of claims 8 to 10 wherein the 1-bit video information is
transformed from polar co-ordinates to rectangular co-ordinates according to said first format by continuous
operation of two multiplier circuits wherein the range measured by a range clock is multiplied respectively by the sine and cosine of the angular bearing of the antenna, said rectangular co-ordinates being connected to the address lines of the memory store whereby a received radar pulse is stored at the appropriate rectangular co-ordinate location in the memory store.
Claim 14
Dependent Claim
19 words
A digital raster scan generator substantially as described with reference to Figures 1 to 3 of the accompanying drawings.
Claim 15
Dependent Claim
19 words
A digital raster scan generator substantially as described with reference to Figures 1 to 3 of the accompanying drawings.
Claim 16
Dependent Claim
23 words
A radar system including a digital raster scan generator substantially as described with respect to
Figures 1 to 3 of the accompanying drawings.
Claim 17
Dependent Claim
23 words
A radar system including a digital raster scan generator substantially as described with respect to
Figures 1 to 3 of the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
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