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Патент USA US2507743

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May 16, 1950
J. A. VICTOREEN
2,507,743
METHOD AND APPARATUS FOR RECORDING 0R INDICATING
Filed Jan. 23, 1946
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AMPLEFIER PULS E
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INVEN TOR.
FIG. 4
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JOHN A. VICTOREEN
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Patented May 16, 1950
2,507,743
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, “UNITED STATES “PATENT ‘OFFIGB‘,
2,507,743
METHOD AND APPARATUS FOR RECORDING
‘-
OR INDICATING
John A. Victoreen; Cleveland‘, ,ohib'iassi‘g'mfto
i The VictoreenlnstrumentCompany, ‘Clev‘eIand,
Ohio
Application January 23, 1946, Sean M. 611E815
screams. (oi. 2159x219)
I
.
2
.
pulses ‘of.v current to beiprovidedbrh1ack;~'iines.
, This invention relates to improvements in ap
...-.paratus for photoelectrically asserting, recording
__The duration of‘; a- pulsedepends ,on the width
of the line and the speed of scanning, while the
i--.or forms and is an improvement on that disclosed
amplitude depends ‘on, the strengthmor the: de
in my copending application, Serial No. 634,038._ 5 gree of blackness thereof. _...It,willube_ appreciated
In the above mentioned application, I have
that in thetase where-the. coincidentcmarkins.
- ;..or5 computing from datum placed on cards, sheets
.shown how one or more photocells can be made
to scan a series of lines to cause a_series of re
placed on the cards, manually, there maybe some
..curring impulseswhich actuates a means Which
‘ ance “in the current, dependingpn theg'blackness
variance in the marking whichwillcause vari
.is .lccked to indicate the desired intelligence by 10 of the line ‘and the widththereof. Furthermore,
there may be times whenthe texture "of the paper
will vary in its reflecting properties to such a
degree as to aifect the accuracy of the operation.
In some instances, the paper-may be linedvpaper
7. may be printed thereon.
.15 or paper in the form of the well known safety
The present invention contemplates means
checks, either of which conditions are liable to
useful in the foregoing to more positively indicate
a?ect the operation and the resultant accuracy.
the intelligence and to prevent the operation
In this respect, I make provision for means which
of the mechanism in the presence of matter not
will eliminate accidental eifects and only take
intended to e?ect the operation.
20 into account the actual lines desired.
"
Still another advantage of the present inven
In carrying‘ this out, the signals from the
tion resides in causing the indicationv to. be
scanner are transferred to an ampli?er circuit l2
effected only by marking, the density of which is
where they are raised to a predetermined level.
between certain limits thus assuring the correct
The ampli?er circuit has coupled thereto a
operation of the apparatus.
1;». = limiter circuit, which may beiof any well known
A still further advantage resides in providing
construction, and which is designed to eliminate
a pulse which is independent of the width of the
all signalsbelow a certain-level and to reduce
.the, placement of a coincident line relative to
one of the regular series. The coincident lines
may be manually placed on the cards to co
ordinate the desired intelligence or, as described,
. line and which permits operation with accuracy
' regardless of whether the control marking is wide
or narrow.
'-. 30
the other signals to a predeterminedvalue; or
if preferred, the ampli?er may be biased to pre
vent ampli?cation of all vsignals below a pre
Other advantages of the invention and the in
vention itself will become more apparent from the
determined level and to only amplify signals
above the desired level, which, signals are fed
following description of an embodiment thereof
which is illustrated by the accompanying draw
to the limiter circuit that removes those portions
of the signals above a predetermined level to
provide a resultant pulse ofv current of square
‘ ings and forms a part of this speci?cation.‘
In the drawings:
Fig. l is a block diagram of one embodiment of
my invention;
_._wave form.
.
-
’ The effect ofgsuch a circuit as determined and
illustrated in Fig. 1 is shown in Fig. 3. Here
Fig. 2 is a similar view of another embodiment;
the undesired signals or background noise is indi
Fig. 3 is a graphic chart showing the operation 40 cated by the irregular line IE but is not recorded
of Fig. l; and
because it is eliminated in the circuit. The cir
Fig. 4 is a similar view illustrating the action
cuit is designed to cut out all signals below the
of Fig. 2.
threshold value as indicated by the line It‘ and to
As described in my above mentioned applica
transmit only such signals as have a greater
tion, I provide a scanner which scans a series of 45 value. The desired signal is illustrated at I‘!
recurring lines, which are indications of intelli
and is a square pulse of current because the
gence, to generate pulses which are locked or con
limiter circuit removes the top of the signal as
trolled by a second scanner which scans a line
indicated at It? to provide the resultant square
or lines coincident to the series of recurring lines
wave which is used to operate the indicator cir
to cause the indication or recording of intelli 50 cuit.
gence.
By this combination, all the signal or back
In the drawings, the scanner is indicated at
ground noises are removed and a clean cut square
I U and the card being scanned at I I. The scanner
signal is provided which provides accuracy oi.’
may be as described in my copending application
recording.
wherein a series of lines are scanned to cause 65
It will be appreciated that due to the human
2,507,743
-
3
element, the coincident lines may vary between
wide limits. For instance, they may not be of
su?icient duration (thickness) to provide the de
sired operation. This might be due to the mark
ing instrument showing too ?ne a line or because
the line was not straight. In some instances, the
line might be so wide as to cause a double in
dication.
-
'
In these instances, I provide an apparatus illus
4
rent from each of said markings, ampli?er means
for amplifying said impulses and limiter means
for limiting the amplitude of said impulses.
2. An apparatus of the class described, includ
ing a scanner for scanning a series of lines to
generate a series of discrete impulses therefrom,
said scanner being movable transversely to said
lines, ampli?er and limiter means for amplifying
all impulses above a predetermined level and for
trated diagrammatically in Fig. 2 which includes 10 limiting all of said transmitted impulses to a pre
determined level.
the ampli?er l2 that is connected to a pulse
3. An apparatus of the class described includ
generator 20. The scanning of a line causes a
ing scanning means for scanning a record and to
signal which is ampli?ed in the ampli?er I2 and
produce impulses therefrom, a pulse generator
triggers a pulse generator 20. In this case, the
output from the pulse generator is as shown in 15 connected to said scanning means and operated
thereby to generate pulses as a result of said im
Fig. 4. It will be noted that the background
pulses, said generated pulses being independent
signal is completely eliminated, and that a, pulse
of the amplitude or duration of said control im
of predetermined height is generated, which
pulses.
pulse is independent of the width, thickness or
4. An apparatus of the class described includ
density of the line being scanned and of a value
ing scanning means for scanning a, record to pro
suf?cient to assure the operation of the appara
duce impulses therefrom, amplifying means con
tus. The pulse generator after once being trig
nected to said scanner for amplifying said im
gered provides a pulse of predetermined value
pulses and a pulse generator connected to said
and width independent of the triggering signal.
ampli?er adapted to be triggered thereby to gen
It may be narrower than the triggering signal,
erate pulses of predetermined level and duration,
thus assuring of a discrimination between the
said generated pulses being independent of am
signals and preventing one signal from causing
plitude and. duration of said triggering impulses.
two pulses and hence an incorrect count.
5. The method of operating a recording or in
It will, therefore, be seen that by my inven
dicating mechanism which comprises scanning a
tion I have provided means whereby a high
record containing intelligence to remove said
degree of accuracy may be maintained in the
intelligence in the form of discrete impulses,
presence of extraneous markings that might have
utilizing said impulses to trigger a generator of
a tendency toward causing inaccurate readings,
pulses and generating discrete pulses correspond
and that the tendency to error is decreased in the
35 ing to the discrete impulses of a predetermined
event of poorly or carelessly marked cards.
value and duration independent of the ampli
It has also been shown how the system can be
tude or duration of the triggering impulse.
made to discriminate between markings intended
JOHN A. VICTOREEN.
to indicate intelligence and markings which are
merely incidental to the material marked upon.
REFERENCES CITED
It should further be noted that the system also 40
The following references are of record in the
provides for a greater degree of accuracy in the
file of this patent:
presence of a wide variation in the speed with
which the matter is scanned because in the case
UNITED STATES PATENTS
where the pulse generation is used, the size of the
Number
Name
Date
pulse is independent of the size of the mark, and 45
there is no opportunity for one mark to cause the
generation of two pulses as might occur for a very
wide mark or a slow scanning speed.
Having thus described my invention, I am
1,893,504
2,010,653
2,203,882
2,271,203
2,323,880
aware that numerous and extensive departures 50
2,406,882
may be made therefrom without departing from
the spirit or scope of my invention.
I claim:
Number
1. An apparatus of the class described, includ
ing a scanning system adapted to scan a, series of 55
markings and to provide single impulses of cur
558,758
Nicolson _________ __ Jan. 10,
Warren __________ __ Aug. 6,
Shore ___________ __ June 11,
Okrent __________ __ Jan. 27,
1933
1935
1940
1942
Carnahan ________ __ July 6, 1943
Young, Jr _________ __ Sept. 3, 1946
FOREIGN PATENTS
Country
Date
Great Britain ____ __ Jan. 19, 1944
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