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July 11, 1950
H. s. HELLER ETAL
2,514,573
SOUND RECORDING AND REPRODUCTION SYSTEM
Original Filed Feb. 23, 1946
‘ a5
.44 as
2 Sheets-Sheet 1
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90
bémmA/i HELLER,‘
MLLHRD£1570FER
-
44 46 50
INVEN TOR
.
BY
Arrwewzn
July 11, 1950
2,514,578
H. s. HELLER ETAL I
SOUND RECORDING AND REPRODUCTION SYSTEM
Original Filed Feb. 23, 1946
2 Sheets-Sheet 2
0
Arrozwzn
Patented July 11, 1950
2,514,578
UNITED STATES PATENT OFFICE
2,514,578
SOUND RECORDING AND REPRODUCTION
SYSTEM
Herman S. Heller, West Los Angeles, and Willard
E. Stofer, North Hollywood, Calif.; said Stofer
assignor to said Heller
Original application February 23, 1946, Serial No.
649,594. Divided and this application March
25, 1948, SerialNo. 17,048
5 Claims.
( Cl.
1
This invention relates generally to the art of .
»A further object of the invention isv to pro
sound recording and reproduction, and more par
vide means whereby the time duration of the
ticularly to magnetic sound recording and re
block may be set as desired, and which, when
production of the multiple lane class, wherein a
properly set, will reverse the tape at the two
multiplicity of recordations are made side by side 5 end limits of the block so that recording or re
on a record tape. The invention will be particu
production is con?ned therewithin.
larly described with magnetic recording in view,
A particular feature of the invention is the
provision on the record tape, along side the sev
though it will be understood as broadly appli
cable to multiple lane recording on any tape type
eral recording lanes, of a control lane on which
is recorded signals capable in conjunction with
of record medium.
This application is a division of my parent ap
associated apparatus of reversing the direction'of
the tape at any predetermined time or tape posi
plication entitled Sound recording and repro
tion. The recorded signals may be used at the
ducing system, Serial No. 649,594, ?led February
beginning and ending of'each block. Additional
23, 1946.
Multiple lane sound recording has a distinct 15 ly, similar signals are preferably utilized at the
advantage for many applications in that'for a
two ends of the tape for automatic reversal of
given recording time, the necessary length of the
the. direction Ofthe tape and transference of
record drive from one lane to the next. This
tape is decreased a number of, times equal to the
provision safeguards against running the ends of
number of lanes used. Assuming eight record
lanes. the saving is evidently quite substantial. 20 the tape o? the reels, and is particularly, desir
able when the block system is not in use, as well
As a corollary advantage, the operator can al
ways return or back track to any portion of. the
as when operations are “outside” the end limits
recording by running the tape a distance which
of any “blocks” which have been established.
The invention, including various additional ob
will never exceeda certain sub-multiple (e. g.,
one-eighth) of the length of tape that would 25. jects and features, will be best understood with
out further preliminary discussion by referring
be used in single lane recording.
now to the-following detailed description of one
However, even with the above mentioned ad
vantages of multiple lane recording as now
present illustrative embodiment thereof, refer
ence being had to the accompanying drawings,
known, the time requiredto back track, i. e., run
‘
the tape in reverse to the starting point, or some 30 wherein:
Figure 1 is a schematic circuit diagram of one
selected passage, is a disadvantage under some
conditions.
.
illustrative embodiment of the invention;
Figure 2’ is a diagrammatic perspective of ' a
An object of the present invention is accord
_ section of record tape and’ showing diagrammat
ingly to provide a sound recording and reproduc
tion system of the multiple lane record tape class 35 ically the cooperation therewith of the translat
wherein complete recordations of'predetermined
time vduration may be made on the several lanes
of the tape within pre-selected longitudinal sub
divisions or “blocks” of the full tape length. It
ing and'control signal electromagnets;
Figure 3v is a diagram indicating the drive
means for the tape; and
‘Figures 4, 5, 6 and PI_ are diagrammatic views
.Will be evident that the end limits of each such 40 of sections of record tape'indicating various illus
trative ty es of block recordingswithin the scope
“block” may be much closer together than the
of the invention. ‘
end limits of the tape as a Whole, and that the
'There are two known methods or systems‘ 'of
time for backtracking within such a block, or re
multiple lane recording‘ either one of which is
winding from one end limit to the other, may be
applicable ‘to they present‘invention. The ?rst,
very materially reduced, thus at once greatly miti
gating one of few remaining disadvantages of
disclosed in prior ‘Patent No.‘ 2,213,631‘, to Herman
tape recording.
,
S. Heller, et' al., involves‘the use of a multiplicity
of translating magnets distributed transversely
A still further. object is the provision of means
by which a recording of any predetermined time
across the tape, and switched‘ successivelyinto
duration may be recorded on an even number of 50 operation as the tape is driven ?rst in one direc
successive. record lanes within a pre-selected
tion and then the other. The present invention
“block,” and will be completed with the tape re
will be hereinafter described in connection with
turned to its starting position, whereby repro
this ?rst-mentioned system.
A second system
employs translating magnets which are shifted
without back. tracking or rewinding-éin brief, 55 transversely of the tape into successive coopera
with. no waiting period whatsoever.
tive relation with the ‘several recording lanes
duction of the recording so made may commence
2,514,678
cording system in accordance with the invention.
The several pairs of translating electromagnets
are again designated by numerals 12 to I9, and
the control signal electromagnets by numeral 2|],
608,734, now Patent No. 2,468,198, granted April
26, 1949, to Herman S. Heller. vIt will be entirely 5 the tape passing therebetween‘ being indicated at
thereof as the tape is driven in first one direction
and then the other. See Patent No’ 2,275,961 to
Herman S. Heller, and also application Serial No.
within the skill of those versed in the art to _
H).
adapt the present invention to this second sys
tem~ of multiple lane recording, and no speci?c
magnets are connected to a common ground lead
illustration thereof is'deemed necessary herein,
Corresponding sides of the several electro
24.
Three decks 25, 26 and 21 of a conventional
it being sufficient to note that both systems are 10 type of rotary, multiple-contact switch have in
sulation rotors 28, 29 and 30, respectively, mount
in contemplation and are included within thev
ed tightly on a common operating shaft 3! with
scope of the appended claims.
'
'
a ratchet wheel 32 which is operated step-by-step
Reference is ?rst directed to Figure 4 of the
drawings, showing diagrammatically, and not to
vby a quick acting pawl 33 connected to the plung
scale, a section of record ‘tape on which a block 15 er of a solenoid 34. It is necessary that this
recording in accordance with the invention may ‘I 7 ratchet mechanism be of a quick acting type,
capable of stepping the switch ahead in a small
be made. It will of course be understood that in
fraction of a second. We have merely indicated
practice the tape may be of a width of the order
such a mechanism in a diagrammatic way, since
of 1A” to 1%”, the present illustration being con
siderably exaggerated and being entirely dia- 20 suitable mechanisms are well known to those
skilled in the art. Each switch rotor carries a
grammatic in nature. The successive longitu
collector ring 35 having a radially projecting con
dinal lines I to 8 represent successively used,
tact or brush 36. This brush 3B is in each in
transversely spaced recording lanes, and the
stance adapted to sweep successively over switch
short transverse lines connecting the longitudinal
lines represent merely the shifts from the ter- 25 contacts 31 carried by an insulation stator, indi
cated at 38 for deck 25, at 39 for deck 26, and
_minal ends of the several recording lanes to the
at 40 for deck 21. In the present instance, the
beginning ends of the next succeeding lanes.
decks 25 and 2'! have eight of such contacts
These shifts might constitute actual transverse
spaced 40° apart, and in the otherwise un-used
movements of the translating magnets, or, as in
the particular illustration herein set forth, elec- 30 ninth position are longer contacts or brushes 4|
bearing constantly on the collector ring 35, while
_ trical shifts between magnets permanently alined
with the respective lanes. The arrows represent
the directions in which the records are made on
the several lanes, and are of course directed op
the deck 26 has four of such contacts spaced 80°
apart, corresponding with the second, fourth,
sixth and eighth contacts of the decks 25 and 27,
positely to the direction of tape travel in each 85 and has also a longer contact or brush 4| bear
ing on the collector ring in the otherwise un
instance. Referring still to Figure 4, it will be
used ninth position. For a nine position switch,
observed that there is a ninth lane 9 between the
the ratchet wheel 32 has ninerteeth, and each
. eighth recording lane 8 and the edge of the tapes
actuation thereof moves the rotor contacts
and it is to be understood that a separate mag
,net or pair of magnets is alined with said lane 40 through 40° of rotation, from one stator contact
to the next.
9 and is adapted to record thereon certain signals
The ungrounded sides of the several translating
utilized to perform a later described control func
tion. The tape is designated generally in the, magnets are connected by leads 42 to the eight
stator contacts 3'! of switch deck 25, and the ninth
?gure by the numeral ID, and the numeral 1 | and"
bracket designate a complete “block” recording. 45 stator contact or brush is connected by lead 43
to the contacts 44 and 45 of a gang switch 46.
Figure 2 shows diagrammatically, again with
Opposed to switch contact 44 is a switch contact
great width exaggeration, a, section of tape l0
and a plurality of pairs of translating e1ectro-,,,; 41 connected to microphone jack 48, a switch arm
,magnets l2 to l9 spaced transversely there-w 49 being movable to make with either contact 44
across, so as to cooperate with the several record 50 or contact 41. Switch arm 49 is connected by
lead 59 to one input terminal of ampli?er 5!. The
lanes l to 8, respectively, andan additional pair
ungrounded output terminal of amplifier 5! is
of electromagnets 29 positioned between said rec
connected by lead 52 to movable switch arm 53
0rd lanes and one edge of the tape and adapted,
to cooperate with the control-signal-lane 9. Each ' adapted to make alternately with contact 45 and
such pair will be understood to consist of a pair 65 with a switch contact 54 opposed to the latter, and
said contact 54 is connected to speaker 55 as indi
of thin steel cores contacting opposite faces of
cated. It will be understood that switch arms 49
the tape, of widths equal to the desired widths
of the record or signal lanes, and having the,,,_ and 53 are interconnected so as to move together,
being in contact with contacts 4'! and 45, respec
usual coils or windings.
‘
For space accommodation, these magnets are 60 tively, for the “record” position, and with con
tacts 44 and 54‘, respectively, for “reproduce.” In
in practice also somewhat Staggered or spaced
the “record” position, the microphone, not shown,
along the length of the tape, in any suitable ar
rangement. The arrangement is of course made. is connected to microphone jack 48, and a circuit
is formed including switch contact 41, switch arm
as compact as possible. From a theoretical stand
point, such stagger may be disregarded, and Fig- 65 49, and lead 59 to the input end of the ampli?er,
and from the output of the ampli?er by lead 52,
ure 4 and similar diagrams are made without
switch arm 53 and contact 45, and. lead 43 to
___taking it into account.
In Figure '3 is indicated diagramamtically a, switch brush 4!. From switch brush 4|, the cir
cuit continues via collector ring 35, brush 36, one
,typical drive system for the tape l0, including
I a reversible drive motor 2|, drive roll 22 in pe- 70 of the contacts 31, and the corresponding lead 42
to a pair. of translating magnets, depending of
; ripheral engagement with the tape, and suitable
course upon the position of the rotor of switch
_" reels 23 which will be understood to be operated
deck 25. The magnets are accordingly in circuit
.. in the conventional manner.
Reference. is now directed to Figure 1, showing " with the ampli?er, and the machine is in condi
'‘ schematically a complete illustrative block re- .75 tion for recordation. In the “reproduce” position,
5
2§6145578
one or the pairs‘ 'ovfjttranslating - magnets,_;a's=' I L
depending upon the position ofswitchrotor 28‘,
forms aicircuit' via its lead 42, switch contactf3'l,
brush 36'and the collector ring to brush 4i, and
fromthere vialead 43 to switch contact 44-, con
tact arm149, and lead 50“ to theinput- end of' the
aniplifienand ‘from the output end‘, of ‘the ampli
fler via lead‘ 52, contact‘ arm 53 and contact 54
to, speaker ‘55. Thus a pair of ' translating mag
nets, depending upon the position of'the-‘rotor' of
mg: conductors‘ 82-. to the. several stationary;v con-l
tac‘ts-3T of- switch deckr26. Thebrush 45.jof deck
26- is connected by a lead 83 to power. lead 10.
It willbe evident that with the rotor-of switch
deck 26 in the position shown in Figure l, the
rotor contact/36-wil1 be in the ?rst position, and
willlnot- be incontact with anyof the contacts
31, so--thatelect-romagnet 80 isvideenergized, and
motor‘ reverse switch 13 is in the position H1115?
trate'd‘. ‘Upon energization of solenoid 34, how
ever, ratchet wheel 32 will be advanced by one
step, as will-theroto-r contacts 3510f. the several
switch decks, andthe rotor contact 36 of deck
is indicated in‘ Figure 4"'as of ‘a split phase‘capaci
26! will then make with the ?rst of the contacts
tor. type, havingfour external leads 56, 51, 58 and
59, two for each phase.
15 311 of'the deck 26. Electromagnet 8.0; one~.side
of-W-hich is permanentlyrrconne'cted' to one side- of
‘Numeral ??'designates'the terminals-ofa source
thesource of current, thereupon has its other
of alternating current power,- andone ‘of said'ter
the switch deck 25, is ‘in circuit with thespeaker.
v"The reversible drive motor 2| 'for'the'machine
side connected through contacts 31 and. 36;,
njiinalsis connected by circuit‘ lead'? I vto the stator
brush 41- and lead. 83 to the-‘other side of the
brush 4| of switch. deck. 21. Brush 4| bears on
the .collector ring 35 of rotor 30, and the brush 20 source of power.‘ Electromagnet an is thustener
gized, and'moves theswitch 13 to the alternate
36‘v carried by ring 35 sweeps successively over
position thereby reversing the direction of’drive
switch contacts 31, as already described. The
motor 2|. It will be evident that the contacts
contacts 31 are connected in order byleads 62 to
31 for the switch deck 26, being spaced '80” apart,
respective. stationary contacts 0-—8‘ of a stop
selector. switch 53, saidswitch having’ a manually 25 complete circuit for the‘ electromagnet' 80 only
in alternate positions of the ratchet" wheel‘ 32
operable insulationrotor 64 provided with a, col
and switch rotor, so that in the ?rst, third, ?fth,
lector ring 65>forme-d with. a gap 66, the ‘collector
etc., positions, the electromagnet 86 is deenergized
ring being-adapted to sweep the contacts 0~—8,
and the motor drives in one direction‘while in
and the gap 66ibeingadapted'to cut any selected
contact. out of circuit. A conductor 61 connects 30 the second, fourth, etc.,‘ positions the electro
magnet'all is energized, and‘ the motor drives in
the two’contacts 0. and '8. As will become evident
the reverse direction,
‘
'
hereinafter, thisswitch 63 may be set to open
The subject matter of Figure l as soy far de
the circuit of the. drive motor in any selected
scribed with the exception of the control signal
position of the deck switches.
..A brush .68 bearing, on collectorring 65 between V35 magnets 20' and the selector switch 63 is more or
less disclosed in the aforementioned patents and
contacts 0 and 8 is connected by conductor 69 to
applications. Thus, the system as so far de
one external lead 56 of onevphase of motor 2|,
scribed, provides a means whereby, upon closure
the other externallead 51 of the same phase of
of motor switch 12. the magnetic tape 10 will be
said motor being connected by leads ‘'0 and ‘H
to the other. terminal 60 of the source of power, v40 driven by the motor 2! in one direction, and with
the assumption’that the switch decks 25 and 26
a motor switch 12 beingv included‘ in circuit as
are in the condition shown in Figure 1, the ?rst
indicated.
pair ofytranslating magnets I 2 will be in active
The other. phase leads 58 and 59 of the motor
circuit,‘ capable of making a recording on the ?rst
are ‘ arranged for connection through‘ a motor
reversing relay. 13 across the power circuit, said 45 lineyof-the tape. If now the solenoid 34 be en
ergized, in amanner subsequently to be described,
switch being adapted when actuatedto reverse
the‘ ratchet wheel 32 will be moved ahead one
the polarity of one phase of the motor withrespect
step, moving with it the rotors of the several
to the other whereby a reversal of the direction
switch decks. In the new position of switch deck
of rotationis obtained. Thus the phase leads 58
and 59 are connected to the two movable switch. 50 25;“?rst lane translating magnet-s l2 will be. cut
arms "and .15 of‘ reversing switch 13; it being
outof circuit and second lane translating. mag
nets I3‘switched into circuit to make a recording
understood thatlsai-d two switch arms are inter.
connected .to move. together. In the, position
on lane2. I . At the same time, switch deck 26,in
its. new position, effects energization of ‘electro
shown, the arms ‘14. and 15. are in contact with
switch contacts 16 and 71, respectively, the former 55 magnet. 80, and therefore operation of switch ‘I3
being.‘ connected to, one power lead 10, ‘H, and the
toreversethe. direction of, the tape drive motor
2! ,, so. that‘. the record tape will then‘ travel. in
latter being connected to theoppofsite powerv lead
.69.' The motor is 'thereiore connected for rota
the. reverse, direction. Hence, a record having
beenmade onlane I with one direction of tape
.tion in one direction. For the reverse direction of
rotation, switch arms 14 and 15 areshifted into on travel,,a second. record, or a continuation of the
?rst, may vnow be made on lane 2 with the tape 1
contact with. switch contacts 18 and 19, respec
traveling. in the reverse direction. As already
tively, of which the former is connected to power
.stated, the, above functionsv have been accom
lead.69;. andthe latter is connected to power lead
plished in the recording systems disclosed in the
10, 'II.' It will be evidentthat'the leads 56‘and ,
aforementioned patents and applications. Fig
5.9 -.of the one phase of the motor have‘ been
ure 1 also showselectric circuit means whereby
reversed with. respect .to. the power leads, so. that
the .“block”' recording system of the present in
the motor will now rotate in the reverse, direction.
vention may bev accomplished, and. this circuit
, The described motor reverse switch .13, is auto
matically operated by a ,magnet??under control
means will next be described.
_
of switch deck 26. This switch 131s ofiatypeto 70
The, aforementioned control signal electro
stand normally in the position shown in Figure
magnets-12!!v are connected by lead 84 to the. mov
able arm. 85v of a “record-reproduce’? switch 86,
4, andto move over, to the alternate position upon
which armis adapted to be moved. to- make with
energizationof the. magnet 80.v Magnet 80,.is ,con
.nectedatLone end _by.means,of lead 8| to,pow,er , 1. a contact 8.‘! for, recording purposes, and witha
lead 6], and at the other end by means of branch .75 contact 88‘ for reproducing purposes. Contact
: atlas-7s
7
8
81: is connected ‘by lead 89 to one output terminal
Ora signal ‘oscillator or generator 99, having a
moved from‘ the position-shown. in.,Figure _1, to
the alternate position... Switch arm 96 making
frequency of for instance 1000 cycles. The other
output terminal of oscillator 99 isv connected by
withcontact92, a circuit is formed whereby oscile
lator 99 ,feeds control signa'lmagnets 29,‘ anda
lead9I to the respective normally open station
1090 cycle note is recorded on the control’ signal
position
lane 9 of‘for
the approximately
tape. The switch
a second,
96 is held'in
whereby,
ary‘ contacts 92 and 93 of two manual switches 94
and .95. The movable arms 96 and 91 of these
switches, cooperable with the contacts 92 and 93,
with atypical tape speed of. 60 ieet per minute,
lating magnets 29, and therefore accomplish 2,1090
trol lane. This control signal is designated gen!
erally by the, numeral _‘ III in Figure'5, though
with considerable contraction owing to space lime
a one thousandcyclecontrol signal of approxi;
are grounded. Closure of either of these switches
will connect oscillator 99 in circuit with trans-v 10 mately one :foot in‘length is recorded on the con“-v
cycle recording on the ninth or control signal lane
of‘the tape. Switch 94 is a gang type, includ
ing also stationary contact 98 and movable
switch arm 99, movable with arm 96, and nor
mally' making with contact 98, but separating
itations. The describedoperation-of switch,,94>
(15 has also temporarily broken'the conrlectionbeL
tween oscillator 99 andampli?er 192, the reason
therefrom as the two arms‘ 96 and 99 are moved
for which will presently become clear. ’
- . I
~ Operations are preferably so timed thatth'e
control signal I II has ‘been recorded by the time
~- The contact 98 of switch 89 is connected by lead 20 thev recording is started on lane _I. v‘Seven and
one-half minutes following the beginning of the
IM to one input terminal of signal ampli?er I92,
predetermined recording period, the manual
and-the stationary contact 98 of switch 94 is
switch¢95 is closed settinginto operation a‘ train
connected by lead I93 and the lead I9I to the
of events as follows:' oscillator 99.‘,i's' again in
same ampli?er input terminal.
_
'
,
tov the alternate position. Switch arm 99 is
connected to lead 89 by a lead I99, as indicated.
‘The output terminals of ampli?er I22 are con~
nected to a relay coil I94 which, when energized,
closes, a normally open switch I95. Connected
to one side of the switch I95 is a lead I99 joining
with one power lead ‘II,’ and connected to the
other side of the switch I95 is a lead I9‘!v con
nected to’ one side of the electromagnet 34, the
other side of which is connected by lead I98 to
the other power lead GI.
circuit with electromagnets 29, and an
v25 closed
other control signal I 82 of 1090 cycles is recorded
on the control signal lane 9 of the tape. Further,-v
more, the oscillator 99 having its circuit thus
closed to ground, sends a signal current through
I99, switch contacts 99, and 98, and leads
3.0 lead
I93 and Hit to' signal ampli?er I92. The ampli
?ed signal energizes relay I94 to close switch I95.
This closure of switch I95 acts in turn to con
-
nect solenoid 34 across the two power leads, and
the resulting energization of the solenoid actuates
ratchet wheel 32‘ to move ahead one step, moving
I the rotors of switch decks 25, 29 and 2‘! likewise
-Arnormally open manual switch I99v is con
nected between the ungrounded end of translat
ing magnets 29 and ground.
w
. '
I
.
A normally open lane selector switch H9 is
connected between lead I9‘! and lead ‘II, “out
side” of motor switch 12,- whereby the stepping
solenoid 39 can be energized‘under manual con
one step ahead. The switch rotor of deck 25 now
connects second lane translating magnets I9 in
.40 circuit, while'the rotorv contact 39 ‘of switch deck
26, now making with one of contacts 91, ener
gizes magnet 89 to actuate motor reverse switch
‘I3, and so reverse the direction of the tape. Thus
trol, eventhough the motor switch 7-2 be open. I I
a The operation of the system will next be de
scribed. It willbe assumed, as‘a ?rstiexample,
the result of closure of switch 95., has been to make
that it is desired to make a 15 minutes “block” re
cording on lanes I and 2 of the tape, starting at 45 the control signal record II2, to shift over from
?rst ‘lane magnets I2 to second lane magnets I3,
the beginning point of lane I, and ending at~the
end point of lane 2, opposite the beginning point
and to reverse the direction of the tape. The time
taken to accomplish these operations, before the
motor 2i reverses its direction, is preferably of
of lane I, as indicated in Figure 5. It. is assumed
that the'tape will travel fromright to (left during
the recording on lane I, and from left to right
during .the recording one lane -2. The small ar
rows in Figure 5 indicate vthe directions inwhich
50
the order» of a fraction of a second, for example,
a quarter of a second, so that the control signal
H2 may be of 'a length ofsay three inches'on
the tape. It may now be understood why the cir
cuit was broken at 99, 99 during the making'of
lanes. ' The record having been made as proposed
on lanes I and 2, then by simply shifting back 55 the signal record I I I, since if the circuit had re
mained closed from the oscillator 99 to the ampli
to lane I, reproduction may be begun immedi
?er I92 duringthat operation, the magnet I94
ately. This is of interest, for instance, where
the recordings will progress along the, record
it is desired to make a recording of a radio pro
gram, and to play the recording back the‘instant
it has been completed.
Accordingly, assume all p
of the switches to be in the position of Figure 1
(note that selector switch 63 is in position,“2,”
denoting that the recording will terminate at the
would have been energized, an'd'the solenoid .34
improperly energized. and cause to change lanes
and reverse the drivemotor. The switch 98, ‘99
prevents this occurrenceduring the starting op
eration. It will of course be understood that the
manual switch 95 will be released and permitted
to open the instant thev above described switch
end of record lane 2) and assume further that
'
the. total recording time is to be of 15 minutes’ 9.5 over to lane 2 has been accomplished.
Instantly after the tape has reversed direction,
duration, as in'the case of a 15 minute radio pro
gram. First lane translating magnets I2 are in
the recorded control signal I t2 passing the trans
lating magnets 29 will generate a signal therein,
circuit through switch deck 25 with the micro
which will of course be transmitted via lead 94,
phone plugged into' jack 48, in condition for a
70 switch 86 to lead 89, lead I99, switch contacts '99
recording to be made on lane No. 1.
and‘98, and leads, I93 and I9I to ampli?er I92,
The machine is preferably started a second or
so before the recording is to begin. At the proper
and might be thought toimproperly actuatethe
relay I94 at this time.v This will not'occur, how
time, motor switich ‘I2 is closed, energizing and
starting the tape drive motor 2|. The moment
ever, forthe reasonthat the tape drive motor
the tape begins to travel, manual switch '94 is 75 will notbe able to‘achieve full speed'until the
2,514,578
tape has-moved several inches, withthe result
that the» generated signal voltage, which willfof
10
controlsignal IIZ, which generates a 1000 cycle
signal. This is fed through‘ switch v86', then in it's
alternate position, directly to ampli?er I02’, whose
output actuates'frelay 'I04,‘causing' switch I05 to
course be at a frequency of less than the normal
i000 cycles, will not be of sufficient amplitude to
effect an operation of the relay I04. It should be
noted that the maximum- amplitude‘ is obtained
from a magnetic tape when the, signal frequency
close. The latter occurrencev of‘ course energizes
solenoid. 34, therebyactuating ratchet Wheel‘ 32
to movethe rotors of switch decks 25, 26 and 21
ahead'on'e step. This inv turn switches fromv ?rst
is..1000 cycles; and it will be understood 1 that
the gain of the ampli?er is made su?icientlylow
lane-magnets. I2' to'second lane magnets I3, re;
with reference, to the signal strength reaching 10 lvers'e's" the direction of tape drive motor H, and
its input terminals that a 1000 cycle. signal‘ is
maintains themotor' 2 I" energized through the se
jleetorfswitchi?t. 'The' tape thus travels in its
required toactuate therelay I04. Thus-the re
corded 1000 cyclesignal on the tape will not'actu
reverse direction, and the recording previously
ate the relay I04 unless it passes the 'magnets'20
made’ on lane 2 is' reproduced. The time taken
atfsub'stantially. full tape speed, which is not 15 ffor'this reversing action will quite ‘evidently be
achieved from aidead- stop within the approxi
the‘ same as the time ‘interval. during which the
mately threeinches-ofltape occupied by the rec
0rd .II2.
‘
1000 cycle signal I I2 was recorded on'the control
‘lane during .the recording operation; namely,
about oneequa'rter ‘of a second. There is'rno
noticeable breakfinv the continuity,‘ of reproducf
tion, and inpractice, it is impossible by listening
,
“Recording thus may'proceed on the second lane
of the tape, with the tape traveling oppositely to 20
its initial direction. Immediately after the total
to'det'ermine that the'change-‘over has been‘ mad
recording period of 15 minutes has elapsed, the
from'lane I to1a’ne‘2.
initially recorded controlisignal I I I will encounter
Reproduction thusproceeds from the second
the control'magnets‘ 20, and will generate a 1000
cycle, signal therein which 'will' be conductedv via 25 lane of the tape'to they end thereof, at which time
the control magnets 20‘ encounter the control sig
conductor *84,swi't_ch' 86, conductors 80 and I00,
"nal I I I‘ 'on the tape, causing a 1000 cycle'control
switch contacts99 and; 98 and conductors I03 and
signal to‘ be delivered through switch 86’ to am'
I 0| to ampli?er I02, whereby magnet I04 closes
switch I05 to energizesolenoid .34 and so advance
pli?er and so on to energize solenoid ts‘and actu
the rotors of switch decks 25, '26, 21. one further 30 ate the rotors of the" switch decks to move one
step ahead. ' As?nr'ecording'the motor circuit‘is
step ahead. Thishas the e?ect of switching to
third lane magnets I4, ‘and operating switch ‘I3
now‘br'cken at the gap‘56‘of the selector switch,
scythe‘ machine stops‘automatically at the ter
=urination of the recording. ‘Motor switch 2I I0
to ‘reverse the direction of the tape drive motor.
It also has the effect,'however, at switch deck 21
and selector switch. 63,‘ of stopping the drive
motor. ,Said motoris energized through line ‘BI’
connected to collector ring 35 ofdeck' 21 by brush
should then be opened.
'
" Assume that it "is-desired‘ 'to~ make a block re
cording of‘ one'hour’s duration, with each of the
4| ,brush 336, one of contacts 31' ‘and the corre
eight lanes"‘taking seven and one-half minutes
sponding conductor '62 and stationary selector
thereof. In other‘ words, the block is to‘ be of‘thé
switch'conta-cts, collector ring 65, brush 68 and 40 same length on the tape as before,vbut1the re
lead 69. With the selector switch '63 in the posi
cording is to be spread over all eight lanes, as rep
tion of Figure 1, this circuit is'broken at selector
resen'tedin Figure '4. The selector switch‘ 63‘is
switch contact 2 when the rotor of deck 21 reaches
this time rotated to‘ bring its gap 66 opposite the
the third position, as it does when solenoid‘34 is
e'ighth'conta'ct, indicating that the drive motor
energized at the end of ‘lane 2 v(or at thetbeginning 45 will stop at the end of lane 8. The, recording op;
of lane 3). The tape drive motor thus comes to
eration will then be initiated‘ as in the‘ ?rst ex
a stop. The motor switch 'IZ'slhould however then
ample, controlsignals II I and I I2 being made on
be opened, so that subsequent actuations of lane
‘the tape aslbefo're.v ‘In this‘ case, however, the
selector switch III) ‘will not‘ result in restarting
selector switch and switch deck 21 do not arrest
the motor.
‘ 7
.50 operation of the machine at the end of lane v2.
There has thusbeen produced the “block” re
Control magnets’20' encounter the control signal
cording I I, using however'only the ?rst and'sec
‘I I'I"'on ‘lane '9, and a 1000 cycle signal is gener
0nd lanes I and 2. The length of the block.» in
ated in- magnets '20and delivered by circuit lead
“time,” has been 7 112‘. minutes, and it will be'un
:84, switch 86, .leads 89and' I 00, switch contacts
derstood that the proportionate length of the tape
usedmight forv instance be one-quarter of itsfull
length.
'
55
I
’ If it should now be desired to reproduce at once
the recordings made on lanes I and .2, manual
switch I I0 is closed successively a number of times
su?icient to bring the'rotors of switch decks 25,
2-6 and 21 back to the original position of Figure 1,
and switches 46 and 86 are shifted to their "re
produce” positions. Translating magnets I2 of
(II
99-and'98'andleads. I03 and .IOI. toampli?er I02,
whereby. relay I04 is energized and switch I05
‘closed to actuate solenoid” 34. Accordingly, the
switch rotors ofdecks 2.5, 26 and 2'I’will vbe stepped
ahead to their thirdv positions, thereby switching
'over to third lane translating magnets I 4,‘ re
versing'the direction of'thetape drive motor back
toits originalidirection, and preserving the closed
motor circuit ‘through switch deck‘ 21 and the se
lector switch 03'. because of the new. position of
the‘ ?rst lane of the tape are now in circuit with .05 the latter, described just above. This occurrence
speaker 55, the rotor of switch deck 26 is in posi
tion for the tape to be driven in its original di
rection, and the rotor of switch deck‘ 21.. is in posi
tion for the drive motor to be energized through
the “0” position ‘contact of selector switch. 63.
vMotor switch ~92 is then closed to start the tape
in its original direction, and the record recorded
on lane I is immediately reproduced. At the end
of, the “block” I I, i. e.,- at the end ofthe recorded
requires .typicallyl about acuarter of a second,
so that ‘the ‘second record lane overlaps the con
trol's'ignal III on the tape by a distance of per
‘haps‘ifthreeinches, as indicated in Figure 1. The
signal IIIdoes not "cause an actuation of relay
I04 at the? beginning of the tape movement in
the new direction for reasons already made evi
dent. Thus the tape is 'driven back and forth
between the end limi'tsdetermined by the two
length of lane I, control magnets 20 encounter wcomroi signals I II and 'I‘I2’recorded on the tape,
"2,5143%
l
"11,
and as said signals are encountered at the end
portions of the record lanes, a switching opera
tion automatically occurs by which the next suc
ceeding translating magnets are connected in
‘ circuit. At the end of lane 8, however, the rotor
of switch deck 21 breaks the motor circuit by
moving to its ninth position (occupied by the
brush 4I) wherein it is disconnected from all of
block; though it may be preferred to actuatethe
selector switch IIG to return operations to lane
I, as has been indicated in Figure 6. In Figure
6, numerals H4 and H5 designate'the new end
limit signals recorded on the‘ control signal lane
to establish the new block, and it will be under
stood without further detailed description how
operations maybe carried on within the second
the leads 62 leading toward selector switch 63. _, block, or within a third or a fourth, just as previ
For this one case, therefore, the drive motor 10 ously described in connection with the ?rst block.
stops simply by virtue of the rotor of switch deck
21 reaching its ninth position, and the only rea
son for pre-setting the selector switch 63 to the
dot-dash position is to preserve the energization
of the drive motor until the end of record lane
8 has been reached.
To reproduce the eight lane recording made as ‘
It will ‘be understood that switch I09 is always
available to permit the tape to be driven beyond
the end limits of any block, so that the machine
may be at any time shifted from any one block
to another block. Once, however, the control
magnets 20 are between the two end limit con
trol signals of a given block, the tape will not
pass in either direction beyond those end limits
just above described, switches 46 and 86 are
without operation of the switch I 09.‘
thrown to their alternate positions, and lane se
lector switch H0 is actuated once to return the 20 , Instead of passing onto the second block from '
the end of lane 1 of the ?rst block, it would also
deck switch rotors 25, 26 and 21 to the initial po
be possible to complete all eight lanes of the first
sition of Figure 1, which restarts tape drive motor
block before going on to the second; or, operations
2I in its original direction, and switches back to
can be transferred to the second block from either
?rst lane magnets I2, whereupon the recordings
end of any lane of the ?rst block. If for instance
on the eight lanes of the tape will be reproduced
it becomes desirable to vgo on to a second block
in succession. As the ends of the several lanes
from the end of block 8, the selector switch Ill]
are reached, the control magnets 20 encounter
may be actuated to return the deck switches to
the signals III or H2, as the case may be, gen
lane I, and the tape may then be allowed to travel
erating signals which actuate the relay I04 to
switch to the next pair of translating magnets 30 to the opposite end of lane I, at which time switch
I09 is depressed to permit the end limit signal H2
and to reverse the direction of the tape, in the
manner already described. At the end of lane
to Itwill
be passed.
be evident that
.
upon,
, passing vfrom one
8, the machine is stopped as in the recording
block
to
the
next,
it
maybe
necessary
to reset the
operation.
.
selector switch 63 to permit automatic stopping
We have now given two illustrations, one con
of the machine at the proper time. For instance,
sisting of a two lane» recording, and the other of
the switch 63 might ?rst be, set to stopthe ma
‘an eight lane recording, within the end limits
chine at the end of lane ‘I, It might then be de
of a single block, the length of the block being
sired to pass on to the second block, but to use
set by the control signals III and H2, and the
only lanes I and 2 thereof, in which case it would
number of lanes used before the machine auto-v
be necessary to properly reset the selector switch
matically comes to a stop being determined by the
63.
, '
setting of the selector switch 63. It will be evi
Referring again to Figure 6, it will also be "evi
dent that the selector switch 63 may be set to
dent that, having ?nished a recording on for in‘
stop the machine at the end of any even num
bered lane, as 2, 4, B or 8, and that in any such 45 stance all eight lanes of the second “block,” the
switch I09 might be'depressed while the signals
case, reproduction may begin at once, without
H4 and H2 passed the magnets '20, thuspermitl
rewinding, on lane I. On the other hand, the
ting recording. along previously'unused lane of
selector switch 63 may obviously also be set to
the ?rst block to the end thereof, just as indicated
stop the machine at the end of any odd num
in Figure 6.
'
'
'
bered lane, as I, 3, 5 or l,‘though in such a case
It will also be readily understood thatfor'many
reproduction from the beginning end of lane I
purposes'it may become desirable to record on the
cannot begin without rewinding.
'
full length of the tape rather than within a block
It may sometimes occur that, particularly where
or subdivision thereof, and that in such cases end
the precise recording time duration is not known
in advance, it will become desirable to go on fol 55 limit control signals recorded’ on the ninth or con
trol lane of the tape near’ the two ends thereof
lowing the completion of an eight lane recording
may be utilized to advantage for purposes of re
within the ?rst block I I and proceed with a sec
versing the tape and shifting from lane to lane.
ond recording within a second block H3, as rep
a matter of fact, we prefer to invariably, make
resented in Figure 6. As one example, if it has
been determined at the end of lane 1 that a sec 60 use of such end limit signals in any event, even
when .employing our block system. Thus, as in
Figure '7, the tape may have several block record
ings, as II and H3, with its respective pairs of
made a short time prior to the instant when .
end limit signals III, H2 and H4, H5, and'it may
control signal H2 encounters magnets 20. . It will
be evident that this closure of switch I09, will by-‘ 65 also have, on lane 9, outside end limit signals I I6
and I I8- These latter may be‘placed on the tape
pass the signal generated within magnets 20 to
ond block is wanted,’ the previously described
switch I09 may be closed, this switch closure being
ground, so that no signal is in this instance de
at any time, and serve to safeguard against ac
dent that in this instance, the recording might
ing along a given lane) .' Such provisions are ‘dis
cidentally running the tape off the reels.
livered to ampli?er I02 for actuation of relay I04.
The present disclosure has not included various
Accordingly, the tape will pass the end limit of
the ?rst record block II, and enter upon a clean 70 well known expediencies such as the provision ‘of
erasing magnets,‘ or of means of reversing the
section ofythe tape, whereupon a second block
direction of the tape drive motor 2| without shift
H3, of any desired time duration, may be re
ing from lane to lane (so as to permit backtrack
corded as represented. It will of course be evi
be continued immediately on lane ‘I of'the new 75 closed in the "aforementioned prior " patents and
13
2,514,578
14
applications and, since they form no part of the
present invention, the present disclosure need not
be burdened therewith.
ings on a record tape, the combination of: re;
versible tape drive means for driving a record
tape in reverse directions, translating electro
magnet means for successively making recordings
One present embodiment of the invention has
now been described in some detail, but is to be un
in reverse directions on a plurality of transverse
derstood as being for illustrative purposes only, it
being understood that various changes and modi
?cations may be made without departing from
the spirit and scope of the invention or of the ap
ly spaced longitudinally extending record lanes
of the tape, lane selector means operable step-"
pended claims.
We claim:
by-step to render said translating electromagnet
means effective with members of said plurality
10 of lanes in predetermined succession, a control
signal electromagnet means cooperable with a
1. In a multiple lane sound recording and re
producing system using a magnetizable record
tape, the combination of: reversible tape drive
means for driving a record tape in reverse direc
signal lane extending longitudinally of the tape,
a signal generator, and an electric circuit includ
ing switch means operable for connecting said
15 signal generator to said control signal electro
magnet means, whereby an end limit recording
tions, translating electromagnet means for suc
cessively making recordings in reverse directions
can be made on said signal lane, and means ener
on a plurality of transversely spaced longitudinal
gized by said operation of said switch means to
ly extending record lanes of the tape, control sig
operate said lane selector means, said electric
nal electromagnet means cooperable ‘with a sig 20 circuit also including switch means operable to
nal lane extending longitudinally of the tape, a
connect said signal generator to said control sig
signal generator, a control circuit connecting said
nal electromagnet means without energizing said
signal generator to said signal electromagnet
switch controlled means.
means, said control circuit being operable to ef
5. In a system for making multiple lane re
fect recording of and limit signals at selected
cordings on a record tape, the combination of:
localities along said signal lane, and means oper
reversible tape drive means for driving a record
able by signals generated in said control signal
tape in reverse directions, translating electro
electromagnet means by said recorded end limit
magnet means for successively making recordings
signals to reverse said tape drive means.
in reverse directions on a plurality of transverse
2. In a system for making multiple lane re 30 ly spaced longitudinally extending record lanes
cordings on a record tape, the combination of:
of the tape, lane selector means operable step-by
reversible tape drive means for driving a record
step to render said translating electromagnet
tape in reverse directions, translating electro
means effective with members of said plurality of
magnet means for successively making recordings
lanes in predetermined succession, a control sig
in reverse directions on a plurality of transversely 35 nal electromagnet means cooperable with a signal
spaced longitudinally extending record lanes of >
lane extending longitudinally of the tape, a signal
the tape, lane selector means operable step-by
generator, and an electric circuit for connecting
step to render said translating electromagnet
said signal generator to said control signal elec
means e?ective with members of said plurality of
tromagnet means, said electric circuit including
lanes in predetermined succession, a control sig 40 switch means operable to connect said signal gen
nal electromagnet means cooperable with a sig
erator to said control signal electromagnet,
nal lane extending longitudinally of the tape, a
whereby an end limit recording is made on said
signal generator, an electric circuit including
signal lane, means energized by said operation of
switch means operable for connecting said signal
said switch means to operate said lane selector
generator to said control signal electromagnet 45 means,
said electric circuit also including switch
means, whereby an end limit recording can be
means operable to connect said signal generator
made on said signal lane, and switch controlled
to said control signal electromagnet means with
means energized by said operation of said switch
out energizing said switch controlled means, and
means to reverse the direction of said reversible
a selector switch and circuit for arresting opera
tape drive means and to operate said lane se 50 tion of said tape drive means upon a pre-selected
lector means.
operation of said lane selector means.
3. In a system for making multiple lane re
.
HERMAN S. HELLER.
WILLARD E. STOFER.
cordings on a record tape, the combination of:
reversible tape drive means for driving a record
tape in reverse directions, translating electromag 55
net means for successively making recordings in
reverse directions on a plurality of transversely
spaced longitudinally extending record lanes of
REFERENCES CITED
The following references are of record in the
' ?le of this patent:
UNITED STATES PATENTS
the tape, lane selector means operable step-by
step to render said translating electromagnet 60 Number
Name
Date
means effective with members of said plurality
2,031,605
Jenkins __________ __ Feb. 25, 1936
of lanes in predetermined succession, a control
2,038,976
Wood ____________ __ Apr. 28, 1936
signal electromagnet means cooperable with a
signal lane extending longitudinally of the tape,
a signal generator, and an electric circuit includ
ing switch means operable for connecting said
signal generator to said control signal electro
magnet means, whereby an end limit recording
65
2,110,090
2,172,779
2,225,323
Ligh _____________ __ Mar. 1, 1938
Von Mihaly _____ __ Sept. 12, 1939
Severy ___________ “ Dec. 17, 1940
2,248,293
Woolf _____________ __ July 8, 1941 -
2,396,409
2,422,143
Berzer __________ __ Mar. 12, 1946
Somers __________ __ June 10, 1947
can ‘be made on said signal lane, and means en
ergized by said operation of said switch means 70
Number
to operate said lane selector means.
4. In a system for making multiple lane record
297,327
FOREIGN PATENTS
Country
Date
Great Britain ____ __ Dec. 17, 1929
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