CONTRACT(Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001500040009-3
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 16
• Document Creation Date: December 28, 2016
• Document Release Date: December 28, 2001
• Sequence Number: 9
• Publication Date: October 4, 1965
• Content Type: LETTER

Approved For ease A-P78BO471PO15000410
Post Office BOx 8043
Southwest Station
Washington, D. C. 20024
5X1 A Attention:
5X1A Subject:
Contracting cer
4 October 1965
Ref: LJC 283-1674
Dear Sir:
In accordance with a request by your. Technical Representative, we are
submitting herewith an Engineering Change Proposal (ECP-135-1). We are..
enclosing herewith three (3) copies of a technical discussion for these proposed
changes. Also included herewith are three {3) copies of a Ctt Break-
down Worksheet for Phase I in the total amount of and Phase II in the
25X1 A total amount of
25X1A
25X1A
25X1A
In the event that this ECP is approved, the time. impact in order to comply
with these changes is as follows: ILLEGIB
Phase I - Completion Date 21 February 1966
Phase II - Delivery of First Unit - 22 August 196'
Phase II Delivery of Second Unit - 24 October 1966
In order to meet these dates, ,it is necessary that we receive your
authorization to proceed for this-ECP by 21 October 1965.
We trust that this Proposal is complete for your evaluation; however, if
any additional information is desir`id, please feel free to contact me.
"This Document contninO informotion
affectir.3 t':_ ?fi cn l D of
the Unit i. Wing
of the ..
U.S.C. ; rn the
transnis of which
in any m r :; r to an unauthorized
person i5 prohibited by
Very truly yours,
Q ? .~ Sit ED By
I
Contracts
DECLASS REVIEW by NIMA/DOD
ILLEGIB
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Next 1 Page(s) In Document Exempt
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 25X1A
Engineering Change Proposal
25,*
UNIVERSAL DATA BLOCK READER
is
25X1A
L1,.
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TABLE OF CONTENTS
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Section Title
1. 1 INTRODUCTION
1.2 INCREASED DATA RATES
1.3 PARITY ERROR PRINTOUT
1.4 NEW FORMATS
1.4.1 35mm Film
1.4.2 5 Inch Film
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LIST OF ILLUSTRATIONS
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Following
Figure No. Title Page No.
NEW FORMAT TYPE IA
DUAL POSITION HEAD MOUNT
BLOCK DIAGRAM BIT LOCATION
LOGIC 5 INCH FILM
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1. 1 INTRODUCTION
This Engineering Change Proposal has been prepared to describe
the changes in scope requested to be included in the Universal Data Block
Reader being designed and developed by
25X1A under
25X1A 1.2
INCREASED DATA RATES
25X1A
minimum data throughput of 1000 characters per secon a required.
The present design is capable of 'recording data at a 300 character per second
rate. Therefore, the present design is not capable of meeting the new require-
r{Lents. The limiting factor in the present deli n is the output media, t. e. the
incremental tape recorder.
To improve the output recording rate it is proposed that the output
recorder, be changed from an incremental type recorder to & .standard
digital
tape drive capable of recording data at a 25.000 characters per second rate.
The rates at which the data is collected are entirely different from
the rate at which a standard tape drive will record the data. Therefore. some
t
storage ia, required to make the two compatable. An analysis of the collection
rate, recording rate and tape utilization (record area versus record gap)
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indicates a minimum requirement of 1, 000 characters of buffer store.
Since the computer has overlap capabilities, there is no need to increase
the store beyond this minimum. It is, therefore, proposed that a core
buffer store of 1024 characters, 8 bits per character be included in the
Universal Data Block Reader.
The theory of operation is as follows:
The read head will sense the data on the film, transfer it
to the data organization section which will process it and organ-
ize it into IBM computable characters. The data will then be
transferred to the core store. When 1, 000 characters have
been stored, the control logic will start the tape recorder and
the stored data will be written on the tape. The buffer will then
be available for storing the next set of data that is to be read.
The complete recording operation will take approximately 50
milliseconds and will be completed long before a new set of
data is ready for storage in the core buffer.
1.3 PARITY ERROR PRINTOUT
While the present approach checked the data for parity errors, no
provision was made to supply a hard copy record of the errors detected. It
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is, therefore, proposed that the Universal Data Block Reader be modified
to include a printout of the block number in which an_error.,was detected.
The technique which will be employed I. as follows:
The Universal Data Block Reader will contain an electronic counter
which will be reset when a new f d onto the machine. As each data
block is read, the counter will be advanced one count. Should a parity error
be detected, the contents of the counter will be sampled and fed into a high
11
speed numerical printer. Therefore, a printed record will be available to
the operator, stating the data block number in which the error was detected.
The data blocks will be assigned numbers consecutively starting from the
beginning of the film.
IwA, NEW FORMATS
The introduction of the two new formats to be read presents a
number of problems necessitating an extensive amount of design change in
the Universal Data Block Reader. Some of the changes will be common to
both the 35mm and the 5 inch film and some will be unique to the 5 inch film
alone.
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1.4.1 35mm Film
The main problem encountered with the 35mm film is that the
geometry of the data block is completely different, in all respects, from
that of all of the other formats. The overall size of the data block is larger,
the space between bits is smaller and the shape of a bit is rectangular rather
than round. Please refer to Figures 1 and 2.
It is proposed that the optical system of the Universal Data Block
Reader be modified to include an additional magnification ratio to produce the
.032" pitch of the data block to the . 018" pitch of the read head. Please refer
to Figure 3. This modification requires the addition of a dual motion capa-
bility in the optical system. The lens and the diode array must be repositioned
to very close tolerances. To reduce the complexity of the change over and the
technical level of the operator required, two separate mounts will be employed
in addition to the overall optical housing. Individual shimmed stops for each
of the four locations will be provided. These stops will be factory adjusted so
that no re-focusing will be necessary by the operator. In addition, to insure
that the lens and head are seated properly at their pre-focused positions, a
spring loaded detent mechanism will be utilieed. This rigid detent will be
used to lock all movable elements into position.
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-----DRECTKUN OF RECORD ADVANCE
01
.972 TYP
30 SLOTS EQUALLY SPACED
T. L N~-3N-"-UMULA ; IVE
NEW FORMAT TYPE 18
FIGURE- I
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LC 12 TYp
22 61- --
i
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156
DIRECTION OF
RECORD ADVANCE
4.500
1
r-.074
I, 627-_--
? .010
. 375 idIN
4.500
30 SLOTS EQUALLY SPACED
rni MOM t't HKAi Is AT l vF
,1I6 TYP ----~?-I
,972 TYP
NEW FORMAT TYPE I A
FIGURE
2
1H_920 TYP
,012 TYP
j--*. --- 0 5 2 T Y P
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 TELESCOPE STOPS TO BE
DESIGNED FOR INDIVIDUAL
SHIMMING IN EACH CF 4
LOCH; IONS
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i
DUAL POSITION HEAD MOUNT
FIGURE 3
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By incorporating a reduction in the data block's projected image
it is now feasable to utilize the same read head structure in extracting the
information for all data formats. While the same read head is employed,
the logic necessary for wander correction will be different. The switch over
to the new logic will be performed by the operator when setting up the machine
? for the new film. This switch over will occurr automatically when the oper-
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ator depresses the Film Selector Switch on the front control panel. The
philosophy which will be employed for film wander correction will be the
same as in the present design. However, the number of gates, the intercon-
nection between the gates, and the bias level of the Data Block Locator will
be different.
1.4.2 5 Inch Film
The 5 inch film has the same problem as the 35mm film with
respect to its geometry and the solution for the 35mm will be employed for
the 5 inch film as well.
In addition, the 5 inch film presents one more problem. All of the
other formats contain an index bit in line with each column of data which is
used as a strobe for locating where the column lies. In this format, the
index bits do not exists. Please refer to Figure 2.
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There are two approaches which may be employed to solve this
problem. One is to turn the head 90* and employ the head geometry to de-
fine where the bits should be. The other is to accurately time the location
of each bit from a known reference (in this case the single index bit which
leads the data).
Originally it was thought that the first approach would be taken.
However, after discussion with the head manufacturers, ~Semicon- 25X1A
ductor, it was decided that an alternate method should be employed since it
would take a minimum of six months to develop a new head. The alternate
approach relies upon an incremental encoder to develop a pulse train whose
frequency to a function of the film movement. This digital incremental shaft
encoder will be mounted directly to the capstan shaft which is driving the film
under the head. Should the capstan change speed due to load conditions, the
encoder will follow and thus the timing pulse train will shift in frequency.
Therefore, the pulse train output of the encoder will be directly proportional
to the film movement and can be employed to measure distance along the film.
The theory of operation is as follows, please refer to Figure 4:
The logic will sense the output of the read head, looking for the
index bit. When the index bit is located, a gate will open allowing the pulse
train output of the incremental shaft encoder to enter the ounter,__-'he
G ` V
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counter will accumulate the pulses until a preselected count has been
reached. At that time a gate will open allowing the data from the read
head to enter the shift register for storage. Since the pulse train is
directly proportional to distance, the counter will in effect be measuring
distance. The read out time can be selected to strobe the center of a typical
. bit; this allowing for a maximum amount of dimensional deviation.
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