Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Reexamination Certificate
1999-01-22
2001-10-02
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
C345S440000
Reexamination Certificate
active
06297827
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wave-form observation apparatus.
The invention is particularly concerned with an apparatus for displaying and observing an input picture signal and/or a stored input picture signal simultaneously or individually. The input picture signal includes wave-forms, characters and/or figures with their intensity (i.e. brightness) information for display.
2. Description of the Prior Art
Shown in
FIG. 1
is a circuit diagram of a prior art wave-form observation apparatus employed in osciloscopes.
In
FIG. 1
, there is an input picture signal
1
. This is an analog signal including wave-forms, characters and figures with their intensity (i.e. brightness) informations for display. The analog input picture signal
1
is applied to an A/D converter
10
, The A/D converter converts the analog input signal
1
to a picture data
2
.
A comparator
11
receives the picture data
2
and a subtracted picture data
3
delivered from a subtracter
13
. The comparator
11
compares two intensity (i.e. brightness) data included in broth data
2
and
3
. When the intensity of the data
2
is stronger than another, the comparator
11
delivers a compared result
4
. The compared result
4
is applied to a switch S
2
. The picture data
2
connected with a terminal “a” of a switch S
2
is applied to a memory
12
as a intense picture data
6
. The data
6
is stored therein. In this case, the data
6
is the same data as the data
2
.
The memory
12
delivers a stored picture data
7
including intensity data to the subtracter
13
. Therein, a predetermined subtractive value is subtracted from the intensity data, Thereby, an intensity of the stored picture data
7
decreases. A subtracted picture data
3
including decreased intensity data is obtained from the subtracter
13
. The data
3
is connected with the comparator
11
and a terminal “b” of the switch S
2
.
When the intensity of the subtracted picture data
3
is not smaller than that of data
2
in the input of the comparator
11
, the data
3
connected with the terminal “b” of the switch S
2
is applied to the memory
12
as a bright picture data
6
. The above-mentioned operation is repeated.
A display composer
17
composes the picture data
2
and the
subtracted picture data
3
to apply the composed data to a display
18
. Input wave-forms included in the data
2
and/or stored wave-forms included in the data
3
are simultaneously or individually displayed on the display
18
at timing of a display timing signal
8
delivered from a display timing generator
14
.
There are shown in
FIG. 2
time charts of the intense picture data
6
(
a
) and the display timing signal
8
(
b
).
A display cycle T is a time interval between a timing t1 and t2 or t2 and t3. A picture is displayed on the display
18
and stored in the memory
12
at a display cycle T.
The picture data
2
and the subtracted picture data
3
, which is delivered from the intense picture data
6
via the memory
12
and the subtracter
13
, are composed by the display composer
17
and displayed on the display
18
every display cycle T.
When the predetermined subtractive value of the subtracter
13
is large, a picture (e.g. wave-forms) with afterglow (i.e. persistent in eyesight) for a short time period is observable on the display
18
. When the predetermined subtractive value is small, a picture (e.g. wave-forms) with the afterglow (i.e. persistent in eyesight) for a long time period is observable on the display
18
. When the predetermined subtractive value is zero, the afterglow (i.e. persistent bright) for an infinity time period is obtainable because the stored picture data
7
is repeatedly displayed. This is an infinity afterglow operation.
When the predetermined subtractive value is large enough or a writing operation to write the intense picture data
6
into the memory
12
is inhibited wave-forms included in the input picture signal
1
are displayed, on the display
18
. This is a non afterglow operation.
When the infinity afterglow operation and the non afterglow operation are alternately repeated, the current wave-forms included in the picture data
2
and the stored past wave-forms included in the subtracted picture data
3
are displayed simultaneously in human eyesight. In case of watching changes of wave-forms in various measurement conditions, the current wave-forms and the stored past wave-forms are simultaneously displayed.
In a multichannel wave-form observation apparatus, the memory
12
has storage segments. Each storage segment is for each channel. In such a case, current wave-forms and past wave-forms of multichannels are simultaneously displayable for comparison observation. In order to display past wave-forms, the infinity afterglow operation and a freezing operation to inhibit the memory
12
from rewriting are required. Those operations are complicated.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a novel wave-form observation apparatus for storing current wave-forms by means of a single operation pushing a button without complicated operations such as an infinity afterglow operation and a freezing operation
According to an aspect of the present invention a memory is rewritable only for a single cycle time of a gate immediately after pushing a button in a memory operation. Therein, a subtractive value is zero for a ready state for the memory operation before pushing the button, so stored data are unrewritable in the memory. A gate is generated for a period of a display timing signal immediately after pushing the button. Then the memory stores a intense picture data. Stronger intense picture data than another is selected among a current picture data and a subtracted picture data in which include wave-form data, characters, intensity data and so on. So the wave-forms, and characters of the selected picture data are display ed on the display.
REFERENCES:
patent: 4426644 (1984-01-01), Neumann et al.
patent: 4743845 (1988-05-01), Diller et al.
Ozawa Satoshi
Yoshida Kikutada
Iwatsu Electric Co. Ltd.
Luu Matthew
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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