A DIGITAL ELECTRONIC CORRELATOR
HENRY E. SINGLETON
TECHNICAL REPORT NO. 152
FEBRUARY 21, 1950
RESEARCH LABORATORY OF ELECTRONICS
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
The research reported in this document was made possible
through support extended the Massachusetts Institute of Technology, Research Laboratory of Electronics, jointly by the Army
Signal Corps, the Navy Department (Office of Naval Research)
and the Air Force (Air Materiel Command), under Signal Corps
Contract No. W36-039-sc-32037, Project No. 102B; Department
of the Army Project No. 3-99-10-022.
MASSACHUSETTS
INSTITUTE
OF TECHNOLOGY
RESEARCH LABORATORY OF ELECTRONICS
February 21,
Technical Report No. 152
1950
A DIGITAL ELECTRONIC CORRELATOR
Henry E. Singleton
Abstract
The relation between correlation functions and the general theory of communication
is presented; this relation leads to a technique for electronic computation of correlation functions and to the design of a machine for carrying out the computation.
Because
of the requirements of great accuracy and long storage the machine makes use of binary
digital techniques for storage, multiplication and integration. Descriptions of the more
unusual circuits in the machine are given, and complete circuit diagrams are included.
A number of experimental results obtained by the machine are presented.
_
___
_
___
__
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A DIGITAL ELECTRONIC CORRELATOR
The application of statistical methods to communication problems is still only a few
years old, but already the power of the statistical approach is becoming generally
appreciated (1-5).
An adequate body of statistical data is not yet available, however,
and this lack prevents the full strength of the statistical technique from being brought to
bear on a large number of communication problems.
The branch of statistical theory
which is applicable here, and which, indeed, must be considerably extended if it is to be
of greatest use, is the theory of random processes.
The theory of random processes
enters because communication equipment must operate for an ensemble of possible
signals, none of which can be specified in advance; they are characterized by a set of
probability distribution functions.
The fundamental statistical parameters which
are required for the solution of general communication problems are accordingly the
set of functions which characterize the ensemble, namely, the probability distributions
Pn(Yl ' t;
where Pn dyl d
2
...
Y2 ' t 2 ;
,
tn.
n = 1, 2, .
dyn is the probability that a member of the ensemble will have
values in the ranges (Y1 , Y1 + dyl),
t 2 , ..
; Yn' tn)
(Y2 ' Y2 + dY2 ).'
' ' J (Yn
yn + dYn) at times t ,1
Since Pi can be found from Pj for j > i, it follows that the Pn describes the
process in successively greater detail as n increases (6).
In applications of the theory
it is usual to assume that the probability distributions are invariant under a shift of the
origin of time, i.e. that the process is stationary.
Although a knowledge of all the probability distributions Pn is required in order to
treat more general communication problems, many problems can be handled through the
use of the second probability distribution PZ(y1 , tl; Y2 ' t 2 )' Since for stationary
ensembles the distribution P 2 depends not on the absolute values of t1 and t 2 but on the
difference t2 - t 1 , it is convenient to abbreviate P 2 (y l , tl; Y2 , t 2 ) as P(y,
Y2 ; r) where
T = t2 - tl. The experimental evaluation of P(yl, Y2 ; T) for even a single stationary
ensemble is a lengthy task (7) because it requires the evaluation of P for each point in
the three-dimensional space Y1, Y2 ,
T.
It is therefore fortunate and of considerable
engineering interest that a certain class of communication problems* can be treated in
terms of the moment of the distribution P:
00
M() =i
x
yY2 P(yl, y 2 ; T)dYl dYZ
(1)
The three-dimensional probability distribution undergoes a smoothing due to the process
*Notably the design of optimum linear systems, Refs. 1 and 2.
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of integration, and the result is a one-dimensional rather than a three-dimensional function. Furthermore, the moment M(T), which may be regarded as the average value of
the product Y1 y 2 (for a specified T),
distribution P.
can be evaluated without recourse to the probability
In fact, if f(t) is a member of the ensemble, the average of products of
pairs of values of f(t) which are separated by time
T
is the correlation function
T
+(T) =To
2rTI
f(t) f(t + T) dt
(2)
-T
For a stationary process it follows from the ergodic theorem that M(T) =
(T).
Theory of Computation
Since, according to the results above only one member f(t) of the ensemble is required to compute
(T),
a convenient approximate method of evaluating +(T) experimen-
tally is to average a large number of products of pairs of samples of f(t):
N
(T)
an bn(T)
E
(3)
1
where N is a large number and a n and b n are samples of f(t) which are separated by the
interval T.
Physically, the above discussion means that the computation may proceed as follows:
A sample a
of the input time series is obtained and stored; after a time
a sample b
is taken and stored; the two samples a and b1 are multiplied together;
the product is stored, and the samples a and b are discarded.
T
has elapsed,
The sampling and mul-
tiplying process is carried out repetitively, and each time a product is obtained it is
added to the cumulative sum of the products previously obtained.
After N such products
have been obtained, the sum is recorded and the device which stores the products is
reset to zero.
The sum recorded represents the value of
consideration.
Proceeding in this way, as many points on the correlation function as
desired may be obtained.
(-) for the value of T under
The procedure just described is used in the present machine.
Although an average might be obtained in a shorter period of time by delaying the entire
wave form, such a procedure would require the use of more complex equipment.
General Design Specifications
An earlier experimental correlator (8) at the Research Laboratory of Electronics
demonstrated the feasibility of high-speed electronic computation of correlation functions.
Results on this earlier correlator pointed out the need for great accuracy in the computing circuits and in the specification of the delay T, as well as a need for a very large
range of possible values of T. Although the preliminary machine served an exceedingly
useful purpose, it was limited in the range of delay available, and hence was unable to
handle many of the problems susceptible to treatment by correlation functions. The
-2-
___
__
present research was initiated in order to provide the laboratory with a highly flexible,
general-purpose correlator; one which would meet the requirements of the numerous
applications which had been proposed, and would take advantage, in its design, of
experience gained on the first correlator.
The following general design specifications
for the present machine were evolved:
1.
Wideband input circuits (d-c to 12 Mc/sec).
2.
Wide range of delays (0 sec to 0.1 sec).
3.
Minimum increments in
4.
Value of
5.
Machine to be completely automatic.
6.
Accuracy and long-term stability to be as great as possible.
T
T
to be less than 0. 1 ,sec.
to be known to within 0. 01 [Jsec.
The requirement for great accuracy and stability, and especially for very long
storage, strongly indicated the use of digital techniques.
used for storing, multiplying and integrating.
The binary system is therefore
By this means, possible sources of error
are limited to the sampling circuits and to the circuits for translating the samples into
binary numbers.
Errors from these sources are first minimized by careful selection
and design of the circuits used.
Remaining errors are further reduced by a special
feedback drift-compensating circuit.
Descriptions of the circuit techniques used are
given below, and together with the general description of the machine, form the body of
the report.
General Description
A functional block diagram of the correlator is shown in Fig. 1.
forward translation of Eq. 3 into functional components.
This is a straight-
To avoid using a separate
number generator for each of the two channels, a selector gate is used to route the A
and B boxcars (or samples) successively to a single number generator.
f l (t) and f 2 (t) are different, their crosscorrelation is obtained.
function is required, the two inputs are connected together.
If the inputs
If an autocorrelation
The boxcar generators are
so called because their outputs consist of wide flat-topped pulses developed from the
original narrow samples.
shown in Fig. 2.
3 and 4.
Typical wave forms at the numbered points on Fig. 1 are
The value of
T
is controlled by fixing the time interval between pulses
Operation of the computer is as follows.
Boxcars 5 and 6 are obtained from
signals 1 and 2 at the time of occurrence of timing pulses 3 and 4.
The selector gate
normally passes the larger of the two boxcars to the number generator, except during
occurrence of gate 7 when boxcar 5 is passed, and during occurrence of gate 9 when
boxcar 6 is passed.
Gates 7 and 9 are also fed to the number generator, and during
their occurrence the output of the selector gate is coded into binary form.
The purpose
of delaying pulse 4 to produce pulse 8 is to insure that gates 7 and 9 do not overlap for
small or zero values of
T.
Thus the number generator has time to code the first boxcar,
gate the resulting binary digits into storage in the number register, and reset itself
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Fig. 1 Functional block diagram of correlator.
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Fig. 2 Wave forms at numbered points of Fig. 1.
.
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before it receives the signal (gate 9) to code the second boxcar.
After the A and B num-
bers are stored in the number register, they are multiplied together in the multiplier
and added to the previously accumulated products in the integrator. When a predetermined number of products (of the order 105) have been accumulated, a number-stop
gating pulse of approximately four seconds duration goes out on the number stop line from
the timing equipment to the number generator, and stops the gating of the A numbers into
storage. By this means the A number section of the register remains reset to zero.
The output of the multiplier therefore becomes zero also, and the number accumulated
in the integrator is recorded.
This is the value of
()
for the particular value of
T
being
used.
The integrator is then reset to zero, and the value of T is changed in the timing
equipment by changing the separation of the A and B timing pulses. The operations of
recording (T), resetting the integrator, and changing T are completed in about two
seconds.
When the number-stop gating pulse ends, the machine begins the computation
for the new value of T.
of
Circuit Features
We now proceed to a somewhat more detailed discussion of those parts of the machine
which are especially important in meeting the design specifications listed above.
Timing Equipment.
Fig. 3 is a block diagram of the portion of the timing equipment which is used in obtaining the A and B timing pulses. These timing pulses must be
accurately spaced, since it is their separation which defines T. A one-megacycle
crystal oscillator is used as a reference.
The output of the oscillator drives a pulse
generator which in turn feeds a cascade of bistable multivibrators. A square wave is
taken from one of the latter stages in the cascade to govern the repetition rate at which
A and B timing pulses are produced, and therefore the rate at which multiplications are
carried out. This rate may be as great as approximately 1000 per second for small
values of
T, but must be decreased as the value of T increases.
Normally the rate is set
low enough to include the maximum value of T used in any one correlation function, and is
not changed throughout the computation. By means of the pulse generator, a pulse obtained from one edge of the square wave triggers the phantastrons, and the phantastrons
trigger gate pulse generators whose outputs are set to have a duration equal to the steps
in
which are to be used.
The gate pulse generators turn on the gates during the occurrence of one of a train of pulses obtained from an earlier stage in the divider cascade.
T
This latter pulse train has a repetition period equal to the desired steps in T. Numbered
wave forms are shown in Fig. 4. The steps in T which are available by this method range
from 1 sec to 210 tsec. Smaller steps in
are obtainable by making use of the trailing
edges of the phantastron outputs directly. By this means, increments in
as low as
0. 02 psec can be obtained.
The phantastron plate-catching voltage is under control of a
stepping relay which produces 110 different voltages in succession. A particular value
of corresponds to each position of the stepping relay, and the relay changes after each
-5-
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_
__
value of
+(T)
is recorded.
The maximum range of T is 110 X 2 10 psec or about 0. 1 sec.
Fig. 3 Block diagram of timing equipment.
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l
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Fig. 4 Wave forms at numbered points of Fig. 3.
Sampling and Coding Circuits. In order to produce a binary digital representation
of the amplitude of the input signal at the time of sampling, the corresponding boxcar is
first converted to a pulse having a duration proportional to the boxcar amplitude. The
duration-modulated pulse is then used to gate a train of timing pips to a binary counter.
The counter is reset to zero prior to the occurrence of each duration-modulated pulse
so that the condition of the counter at the end of the duration-modulated pulse is a binary
representation of the boxcar amplitude (10). It is evident that the only important errors
produced by the correlator must lie in these circuits; that is, in the boxcar generator
and in the duration-modulated pulse generator.
The duration-modulated pulse is obtained
by intersecting the boxcar with a saw-tooth wave form, and marking the instant of
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TIMING
PULSES
Fig. 5 Block diagram of number generator and associated circuits.
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Fig. 6 Wave forms at numbered points of Fig. 5.
equality of the two voltages.
Thus the critical portions of the duration-modulated pulse
generator are the saw-tooth wave form generator and the comparison circuit used to
indicate equality between the saw-tooth and the boxcar.
The boxcar generators, saw-
tooth generator, and comparison circuit are discussed next.
the interconnection of these circuits is given in Fig. 5.
A block diagram showing
The operation indicated by the
diagram can be followed with the aid of Fig. 6, which shows wave forms for numbered
points on the diagram.
Boxcar Generator.
A block diagram of one of the boxcar generators is shown in
-7-
---
---
----
Fig. 7.
There are two of these circuits, one for each channel.
The input timing pulse
is reshaped for uniformity in a blocking pulse generator, which produces a very sharp
sampling pulse a little less than 0. 1 pLsec in duration.'
The sampling pulse is applied to
I
Fig. 7 Block diagram of boxcar generator.
the suppressor grid of a 6AS6 gate tube normally biased below plate current cut-off, and
the input time series is applied to the control grid.
The need for a very narrow
sampling pulse and a wide, flat-topped output pulse imposes conflicting requirements on
the boxcar generator.
The wide output pulse is obtained by storing charge on a con-
denser.
In some cases use is not made of the stored sample until about 600 Lsec have
passed.
To prevent appreciable decay of the charge during this interval a large con-
denser (0. 01 Lf) is used.
If we assume a leakage resistance of 40 megohms, for exam-
ple, the discharge time constant is 400 millisec, and this is satisfactory.
Assuming a
charging resistance of 500 ohms, which is the order of magnitude that can be easily
obtained, the time constant is 5 usec, and a 0. 1-Lsec pulse is not wide enough.
The con-
flicting requirements are met by widening the original 0. 1-pLsec sample in successive
stages, as shown in Fig. 7.
Saw-Tooth Generator.
Fig. 8.
A schematic diagram of the saw-tooth generator is shown in
This is a Miller feedback circuit using three stages of gain, and gives extremely
good linearity.
Generation of the saw-tooth takes place during the presence of a gating
pulse on the normally cut-off suppressor of the first stage of the amplifier.
Tempera-
ture drift affecting the saw-tooth slope is compensated by returning the resistor of the
RC combination which determines the slope to a variable voltage under control of the
first or principal digit in the B channel of the output of the number generator.
put of the number generator ranges from 0 to 1023.
-8-
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The out-
If the first digit is one, the output
-
SAWTOOTH
_
GATE PULSEJ
SAWTOOTH
OUTPUT
Fig. 8 Saw-tooth generator
is equal to or greater than 512.
If the first digit is zero, the output is less than 512.
The voltage applied to the slope control resistor is proportional to the relative frequency
of occurrence of one in the first digit; and is of the proper polarity to decrease the size
of the number if the relative frequency is greater than 50 percent, and to increase the
size of the number if the relative frequency is less than 50 percent. Use of this drift
compensation circuit has reduced errors due to long-term drifts in the correlator to
negligible importance.
A schematic diagram of the comparison circuit is shown in
The saw-tooth is applied to the grid of V1 and the boxcar to the grid of V2.
Comparison Circuit.
Fig. 9.
SAWTOOTH
INPUT
BOX CAR
INPUT
Fig. 9 Comparison circuit.
As the saw-tooth passes through a narrow range of voltage in the neighborhood of the
boxcar voltage, the plate current of V1 shifts to V2. No triggering is involved, since no
-9-
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regeneration is present.
Because of the pentode V3 in the common cathode circuit of
V1 and V2, the plate current of V2 after the shift is equal to the plate current of V1
before the shift.
This causes the voltage swings across the plate resistor of V1 and V2
to be equal, and allows the use of fixed grid biases in V4 and V5.
V5 are driven in push-pull.
The grids of V4 and
A narrow slice is taken near the midpoint of the grid swing,
and appears in amplified form at the plate of V4.
The resulting essentially rectangular
wave form is applied to a regenerative amplifier, or trigger circuit, which derives a
sharp pulse from the leading edge of the rectangle.
This sharp pulse is used to reset a
flip-flop (not shown on Fig. 9, see Fig. 5) previously triggered by the leading edge of
the saw-tooth gate.
modulated pulse.
The wave form at the plate of the flip-flop is the required durationIt is used, as has been indicated, to gate the timing pulse generator
which drives the binary counter in the number generator.
High-Speed Counter.
ber generator.
Very little need be said about the binary counter in the num-
Since 10 digits are used, a maximum of 1023 pulses may be counted.
In
order not to take too long in the counting, a 5-Mc repetition rate is used for the pulses
to be counted, thus requiring at most 200 pLsec.
in Fig. 10.
The first stage of the counter is shown
The circuit was tested for several weeks at 10 Mc/sec before being incor-
porated into the equipment.
The essential feature of the circuit, which allows it to
+
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1
Fig. 10
High-speed counter
operate at unusually high speed, is that crystal diodes from the grids to a tap on the
cathode resistor are used to discharge the coupling capacitors C through the low input
impedance of the opposite tube.
(100
This permits the use of large coupling capacitors
±Lfin this case) and still permits them to discharge quickly after each triggering
to a voltage from which the flip-flop can again be triggered.
10-
I
'
After each of the numbers for the two input channels is
generated, it is gated into storage in the number register (see Fig. 11). The register
Register and Multiplier.
consists of two sets of ten flip-flops each (one set for each of the two numbers to be
Fig. 11 Block diagram of part of number register.
multiplied) and includes means for shifting the A numbers to the left and the B numbers
Although ten digits are stored in each register, for simplicity only four
to the right.
stages of each are shown in Fig. 11.
Assuming that a number is in one of the registers,
the shifting is accomplished by resetting all of the flip-flops to zero.
each flip-flop is a monostable delay multivibrator.
Associated with
Any flip-flop in state one has its
state changed by the reset, and produces a pulse which triggers its associated delay
The trailing edge of the delay multivibrator is used to set the next flip-
multivibrator.
flop to one.
Thus each symbol of the stored numbers is moved one stage to the left (in
the upper register) or right (in the lower register).
This process continues,
pulses are applied, until only zeros are present in the register.
as shift
The shift pulses are
then stopped.
In Fig. 11 is also shown an example of binary multiplication.
carried out in a manner analogous to decimal multiplication,
The multiplication is
as follows:
1.
Each digit
of the upper number is multiplied by the digit occupying column four of the lower number,
and the result is written in the highest empty spaces directly under the upper number.
2.
The upper number is shifted one space to the left and the lower number, one space
to the right.
3.
Steps 1 and 2 are repeated until all digits have been used.
4.
The
partial products obtained with each step 1 are summed to give the complete product.
In the machine the process is exactly similar.
The value of each partial product is
present between shift pulses in the state of the coincidence circuits shown in Fig. 11.
-11-
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In
fact, the first partial product is present as soon as both numbers are stored.
This par-
tial product is read off into the accumulator, or integrator, by means of a sequence of
pulses which examine the state of the coincidence circuits in succession, and send, or
fail to send, trigger pulses to the appropriate stages in the integrator.
As soon as all
the coincidence circuits have been read, a shift pulse is sent to the register, and the
reading process is repeated.
remain in the register.
250
This sequence of operations continues until only zeros
The two ten-digit binary numbers are multiplied together in
sec, once they are both present in the register.
Integrator and Recorder.
As has been indicated, the integrator comprises a cas-
cade of scale-of-two circuits, or flip-flops.
A multiple-pen Esterline-Angus Recorder
is connected to the last ten stages of the integrator and the condition of these stages is
read into the recorder at the end of each integration period.
The integrator is then
reset before beginning a calculation with the next value of
A switch is provided for
T.
skipping one or more of the intermediate stages in the integrator so that the ten stages
recorded may always represent the most significant part of the result.
At the same
time that the digits are recorded they are decoded in a voltage adding circuit, and the
result is recorded on a General Electric Recording Microammeter.
The decoded re-
cording is useful in test runs for immediate observation of results, but is not as accurate as the digit recording.
Sample Results
Fig. 12 shows the correlation function of a sine wave as evaluated and plotted by the
machine.
The steps in T are 4 usec.
Fig. 13 shows the correlation function of a limited wave produced by passing wideband (3 Mc/sec) noise through an RC integrator (5 )psec time constant) and then limiting
the output of the integrator to produce a rectangular wave.
Fig. 14 shows the correlation function of a rectangular wave with independent random
zero crossings*
Fig. 15 shows the convolution integral
7
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-1I/T2
- /T
1
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obtained by taking the crosscorrelation of the output and input of an RC circuit (T 1 =
50 ,sec time constant).
The input to the circuit was obtained by passing wide-band
(3 Mc/sec) noise through an RC (T 2 = 5 pLsec time constant) integrator (10).
*Obtained from equipment designed by C. A. Stutt.
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Detailed Functional Diagrams
A detailed functional block diagram of the complete correlator is shown in Fig. 16
Fig. 16 includes all the computing circuits of the machine and Fig. 17
and Fig. 17.
includes all the timing circuits.
These functional schematics are easily followed on the
basis of the preceding discussion of individual circuits.
Schematic Diagrams
Complete schematic diagrams of all circuits are given in Figs. 18 through 31. It is
believed that these detailed schematics may be useful as reference material to future
designers of similar equipment.
Photograph
A photograph of the correlator is shown in Fig. 32.
Acknowledgment
The writer wishes to express his appreciation to Professors J. B. Wiesner and
Y. W. Lee for the supervision of this project, to Professors R M. Fano and W. B.
Davenport, Jr. for helpful suggestions, and to T. P. Cheatham, L. G. Kraft, A. J.
Lephakis and C. A. Stutt for their generous assistance on numerous problems connected
with the design and testing of the machine.
References
1.
N. Wiener: The Extrapolation, Interpolation and Smoothing of Stationary Time
Series with Engineering Applications (Wiley, N.Y. 1949).
2.
Y. W. Lee: Course 6.563 Class Notes, M.I.T.
3.
N. Wiener: Cybernetics (Wiley, N.Y. 1948).
4.
C. E. Shannon: A Mathematical Theory of Communication, B.S.T.J. (July 1948
and Oct. 1948).
S. O. Rice: A Mathematical Analysis of Random Noise, B.S. T.J. (July 1944 and
Jan. 1945).
H. M. James, N. B. Nichols, R. S. Phillips: Theory of Servomechanisms, M.I.T.
Radiation Laboratory Series 25 (1947).
5.
6.
7.
W. B. Davenport, Jr.: Technical Report No. 148, Research Laboratory of
Electronics, M.I.T. to be published.
8.
T. P. Cheatham, Jr.: Technical Report No. 122, Research Laboratory of Electronics, M.I.T. to be published.
9.
A. H. Reeves:
10.
U. S. Patent No. 2272070.
Y. W. Lee: Experimental Determination of System Functions by the Method of
Correlation, p. 60, Quarterly Progress Report, Research Laboratory of Electronics,
M.I.T. (Jan. 15, 1950).
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