DE1537291A1 - Arrangement for the transmission of images with scanning of the original and recording of a copy thereof - Google Patents

Description

Patent attorney

Karl A. Brose _: 10 * 1001

Dipl.-Ing. 'I OO / 49 I.

Munich-Pullach

W * m Str. 2 - Tel. Munich 780670
■ K / Mü Munich-Pullach, August 22, 1967 *

Phonocopy, Inc., 100 West Tenth Street, Wi3itiington, Delaware, USA

Arrangement for the transmission of images with scanning of the Originals and record a copy of it

The invention relates generally to a facsimile system. the devices used in it and in particular a paksimile system in which signals are transmitted in binary form, in order to obtain satisfactory results in terms of resolution and signal-to-noise ratio when used for transmission only one channel with a low bandwidth is available «

There are a number of facsimile transmission systems known which work more or less satisfactorily with regard to the achievable resolution and the achievable transmission speed. In general, attempts have been made with these systems to obtain a good reproduction of the material scanned in the transmitting station, with the analog properties of the signal obtained during the scanning being retained in the modulated signal which is transmitted over the transmission path between the transmitter and the Recipient. This analog signal is recovered at the receiver and fed to a printing device, which can normally also reproduce halftones (gray scale), so that the shading of the facsimile of the original template produced in this way corresponds more or less to the corresponding shading of the original template. Whilst it is in any case possible to digitally encrypt the analog signal and to send the information in digital form, which in encrypted systems

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Obviously, this has already been carried out for safety purposes Such systems transmit channels with a relatively large bandwidth, since the information contained in the analog signal when converted into digital form, generate a signal which is a considerable bandwidth is required if reasonable transmission times are to be achieved.

An essential idea of the invention is directed to the implementation the visible scanned corresponding to the original Signals directly into a series of binary bits, thereby creating one can use a low bandwidth channel for encryption and transmission and the received, the Pakistoxile to be assigned binary signals in a black and white printing only Used facility that does not print halftones. Such a system is particularly suitable for scanning or detecting e.g. Typewritten or printed texts and the like Templates such as drawings and maps without the need to faithfully reproduce halftones. In this case it can the data corresponding to the template using the rotary dial transmitting telephone network - which is known to be a channel is extremely low bandwidth. Tntizdem you get reasonable transmission times, so that e.g. a typewriter page can be transmitted in about four minutes, making the system economical to use between telephone subscribers can be.

According to a further concept of the invention, there is a binary timer oscillator frequency used to derive from it synchronization signals for the scanner, with the receiver since one Phase locking is used to bender between the scanner and the printing or writing device - or receiver since ig To achieve synchronization. "*

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Another aspect of the invention is to connect to a telephone set to provide a coupling with the help of which the fakisimile system according to the invention coupled to the telephone network or The invention also provides a magnetic Coupling device to both the handset of a telephone to send as well as to receive, through which all those Distortion and interference are eliminated that usually occur occur during acoustic coupling to telephones.

Further advantages and details of the invention emerge from the following description of an exemplary embodiment unfeer Reference to the drawing. In this show:

Fig. I schematically the assignment of Figures 2, 3 and 4 to one & rdez * άη - * &? * & _H J & .se an overall circuit diagram is created}

Fig. 2 in the block diagram the Ätv ^ sfc- * z & Vc Tarnel'-M'lm ^ iß ^ VL ^ with associated control means? one statiorj

3 shows in a block diagram a "modem circuit" according to the "invention" and

Fig. 4 In section, a coupling device for connection to a telephone receiver.

If the figures 2, 3 and 4 are put together according to FIG. 1, the block diagram of a complete station is obtained as it is used by every subscriber in the transmission network according to the invention. The station can be used both as a transmitter and as a receiver if it is connected to the telephone by means of a telephone equipped with a rotary dial. Although ά .-- :? Invention is explained on a sola hen Ausfulirmigsbeispiel, at aw the stations with ielefoaappayijssn üei? ciss SslefoKiEC ^ a: 'i: lv t. \ _: ::; ■ -.- 3v are coupled, the invention can rm ^ l-' ö. ^ Am-ih ίώτ-

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turned 'so that other transmission channels are used and the invention can also be carried out such that a device is not sender and receiver at the same time, but that for Send and receive separate devices are used.

Reference is first made to FIG. Acting as a printer and a scanner assembly 11 is the AFC formed to sheets of paper under the effect of a St your Vorschubmofcors not shown (lT @ 3? Tics! Motor) are ..geschoben at a predetermined speed through one Afofcasfelinienstellung. Of the. Scanner-printer 11 can a _a B _e according to a proposal belonging to the prior art according to US patent application 579 584 of September 15, 196-6. A scanning head constantly moves back and forth over the path corresponding to the scanning line ₉ , scanning the sheet moving through the printer scanner 11 photoelectrically, and emits an airlHalogsignal, which corresponds to the changes in the lefleisioiiseigenseiiaften the ⁵ Fapler surface when sending "This speaks _β-scanning can also gum printing a sheet © nt speaking such facsimile signals are used which are placed upon receiving the, scanner printer. 11 To this end, di © H te movement of the abbot a St-- or print head to d ^ © Äfefcasfclinig by a Abfcastmotor (horizontal ^ moto r) gesteuei * _s ά <&$> ünfcer represents ³ Sfceuex "wirku-ng of a power amplifier 12 - the power is stronger If is fed from a frequency of 40.0 "Hz" from a frequency of 40.0 "Hz" by frequency divider "13" © .2 ^s holds - "a frequency of 4 . "kHs 'from the ^M Modeia ^m -unit-' dev figure S ₀ .. as will be described below-, see below _e The vertical motor is controlled by a switching device 14«

■ It "is first described the" operation of the, printing and scanning device "11 3m. Sen4 © befc3? "Modsat" «= Se.halfeuaga Vielhe'die Quel'le) various control signals

1st, and then the further operation of the printing and scanning device 11 will be described. For the transmission mode, the printing and scanning device 11 is put into operation by inserting a sheet of original which is to be transmitted through the entire arrangement. The introduction of such a sheet closes a switch 82, whereupon a signal appears on the line 15. This signal indicates the presence of the paper in the feed system. The signal from the line 15 is used to set a P3 $> - flop 84, which switches the vertical motor through the AND gate 88 and actuates l4 in the sense of starting the corresponding motor. The printing and scanning unit 11 according to the above-mentioned proposal, which does not belong to the state of the art, can be used both for scanning and for printing in such a head, which makes the synchronization of the transmitting and receiving stations easier because the drive motors, the masses and the moments of inertia are the same in each station.

The photoelectric generated by the scanner in the unit 11 analog signal appears on line 21 and goes through a QuarfcLslerschaltung 22, which the analog signal of the line 21 converted into a binary signal having two different levels on line 23. As a digit ier circuit 22 can be a many known circuits in this regard can be selected, but a circuit not belonging to the prior art can also be selected according to the US patent application mentioned above. the Quantizing or digitizing circuit 22 according to the proposal, which does not belong to the prior art, has the unusual property on that they have fluctuations in the analog signal on the line 21 that do not correspond to those transitions that from the transitions black and white in the template. Such sharpnesses are to a certain extent with all scanners To an extent inevitable and the scanner not belonging to the state of the art has been shown to be different from the critical

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Fukusierung derive from the optical system, which in the moving Scanning head is used. Circuit 22 eliminates such baseline fluctuations and generates on line 23 a simple binary signal with two levels, one level meaning white and the other black, depending on whether the scanning head captures a white or a black section on the original.

If all fail it causes fluctuations in the signal on the line 23 are taken, and it only shows sections which mean either black or white, which are indicated by the pure binary signal are transmitted, there is the possibility of a particularly economic Utilization of the bandwidth and, moreover, one obtains a particularly good signal-to-noise ratio. With the preferred one The exemplary embodiment is through leil response transmission (partial response transmission) achieved. To this end, will the normal binary signal on line 23 is converted into a time-controlled binary signal on line 25. The timing overfrequency of 4kg Hz is supplied via line 26 from a pulse divider 27, which in turn is supplied with a precisely controlled 72 Hz frequency from a precisely running crystal oscillator 28 is fed.

The encoder 24 corresponds to that in U.S. Patent 3,162,724 described, wherein the timer pulses of the line 26 and the binary input for the line 23 are fed to an AND circuit; the output is applied to a flip-flop, which switches over whenever an output variable comes from the AND circuit. This turns the normal binary waveform on line 23 into a Waveform implemented on line 25, which in turn changes state whenever the timer detects pulse time, that there is a level in the binary signal on line 23 and which then does not change its state when the other level

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of the signal on line 23 is present.

The binary signal on line 25 is converted into a biternary or triple-level signal on line 32, namely through the pre-modulation filter 31 which is e.g. can be phase-corrected, seven-pole Butterworth filter, whose cutoff frequency is 1.4..KHz. So that the biternary signal on line 32 via the one formed by a telephone line, narrow band can be transmitted, the width of which is about 2000 Hz, the biternary signal on line 32 on a 2.6 KHz carrier from an oscillator 33 in a balanced Baseband amplitude modulator 34 impressed. This molulation process reverses the spectrum and shifts it and then passes through a remainder since the band filter 35 (which e.g. In nine-pollges Butt answer h-L ief passf ilts with a cut-off frequency of 2.4 "KHz its itemn) is an output signal on line 3β get which the iosvlieh filtered doppefce side bass sir na 1 from the modulator 34 is * itercfc this ¥ öi? gelio * i will be the Coehfrequency components of the modulate ioassignals-s in the Hiederfs'equenaabschnitt of the side ligament implemented, whereby the best! rope üe-; Telephone band can be used for the signal spectrum «

Ds, c signal on line 36 is passed through UKD gate 93 to a '

iL «xfilter (transversal filter) 37 given. The transverse filter 37 is switched, i.ituels a switch indicated at 55 either to a Sen-, \ fe '; :: arakfceristik or a receiving response characteristic and is switched by the Sehalter 30 and 40 between the Sen-? .- ef.-i .gnalpfad and the received signal path switched. The transverse filter - (t: * εreversal filter) 37 is a well-known circuit and supplies , jrine ^ uerfunktion (transfer function) for equalizing the signal _{J 1 ^ -.} ; ^ ;; υ- ··:.: unit that can come from the various previously described:. ·? -,: I; -: i ^ iron and corrects similar distortions,; i ^£ ; i: ..> ■■ '/ "': - ^ channel of the device appear. The signal from the

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Cross filter 37 is ever stronger 38 in one power high hill so that it can supply the operating current for a coupling coil 39.

The coupling coil 39 is particularly adapted to use the

, 4 "

Loudspeaker 41 of a handset "type U-I from the US company Bell Telephone Company * For this one .; The coil passes two times 39 of 50 windings with the wire No. 26, which is wound in such a shape that ... the winding around the circumference of the earpiece 4i. In the area of the magnetic coil 42 fits. This inductive Coupling ZWB lc hen the coils 39 and 42 has proven to be effective Device for coupling signals into the telephone network has been proven. The amplitude of those coupled into the telephone network Signals is limited by the varistors 58, usually above the. The speaker's coil is positioned to limit the peak power that can be heard from the earpiece can be. This amplitude signal has proven to be useful proven for coupling facsimile signals into the telephone network * With this arrangement the problems of reverberation, a bad <frequency response and a variable coupling that would occur if one an acoustic coupling with the microphone of the hearing hearer one Telephones because the known limitations of two coupled acoustic transducers cannot occur. The for Magnetic coupling serving coil can also be adapted to other earpieces on handset when magnetically coupled signals that are induced in the inner earpiece coil 42 are used to transmit signals over the telephone network should. Of course it is technically also possible to briefly describe the above <mentioned acoustic coupling or above. Wires running without seeing Coupling. To be made when the connection to the telephone network is through to be led. '

Ssl operation is the whole arrangement in that shown in FIG

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Catfish connected to a telephone line and the desired one The recipient is selected through the normal telephone dialing process or switched on. At the receiving station there is a 3m station identical to the one shown, which is used for this purpose the facsimile signals coming over the telephone line. to use a facsimile copy of those originals print whose associated signals are sent in the manner described above.

If the arrangement is to be used for reception, then, will brought them to the ready to receive, that all the appropriate So it has to be switched from S to R, the earpiece of the telephone handset is also in the middle of a reception would take bobbin 51, which is shown in Figure 4 above. The recording coil 51 is hum-coil 52 with a special budget connected, the coils 51 and 52 against each other for from its fields connected, but for mutual support for Signals coupled in by the earpiece · Details of this de-hum coil arrangement are in US patent application 579 589 of 15 September 1966.

The signals from the coils 51 and 52 are applied via the line 53 to an amplifier 5 ¹ ^ operating with automatic gain control and then through the cross filter 37 and from there to a two-wave envelope detector 56, the cross filter 37 being switched by the switch 30, $ 0 and 55 was switched to achieve the desired transmission properties; the switches 30, 40 and 45 are actuated by a transmit-receive switch 10. The transmission properties of the cross filter 37 cause an amplitude and base correction during reception for the corresponding amplitude and phase distortions caused by the telephone line and the coupling device which is used for coupling to and from the telephone network, with various others as well Distortions are compensated,

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The output of the detector 56 supplies a control voltage for the automatic amplification of the assertion on the line 57 to the amplifier 54 and a signal on the line 91, which indicates the concern of the carrier let ζ he signal it to one OR circuit 87 is applied.

The detector 56 has a post detection filter (post detection

filter), e.g. the UTO-Type LMI 2500, with a low-pass character

aur teristics of 3 dB or more at 2500 Hz /, which captured this ternary Um hü 1 development or three-level signal to a biternary desoling circuit 6l applies. This ternary wave corresponds to essentially the ternary signal on line 32 of the transmitter. The decryption circuit 51 uses logical switching elements to recover the original binary signal the line 23 of the transmitter corresponding binary signal from the ternary signal. The output on line 62 is therefore the desired Schwarz-Welss information. The circuits are both for encryption in circuit 24 when transmitting and for decryption to recover the original binary signal discussed in the article "Binary Data Communication By Partial Response Transmission "by Kretzmer in the report of the" IEEE Annual Communications Convention "June 7 to 9, 1965, pages 451 to 455 * The decoded binary signal is compared with the local * ^ Hz wave on line 26 and an error signal is sent to the Unit 27 placed around the locally generated 4: KHa wave in phase with to lock the incoming data.

The normal binary signal on line 62, which is black or weis · is applied to a power amplifier 63. ', the the part of the unit 11 used for printing by current pulses operates on line 64. Since only information representing black and white appears on the line 64, it becomes two-dimensional

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a printing device is used in the unit 11 which, without any: Qr.aueohattlerungen only black or white prints. Some facsimile printers can, when fed with binary signals of this type, print and print purely black and white copies of the Orfeina Ivorlage thus such printing devices can be used together with the circuit described earlier, albeit preferably the printing device briefly explained above and not belonging to the state of the art is used «

The control device for the printer 11 is described below. Control functions are required for the following processes: starting and stopping the drive for transporting the paper through the printer 11 at both the sending and receiving stations; synchronous and Phasen? loht igen start of the horizontal or transverse drive for the scanner at the receiver and at the sender. The printing device has a paper transfer device with driven "rollers 71 and 71 ', which in front of and behind a pen " JM against the smooth upper & bhen of GHe itplatten abut J2 and 73, respectively, so as to control the paper motion. the pen 7 ^ is practical, a rod of electrically conductive material, zweokmässig 1st metal mounted on the horizontal verlaufendem Qurt 75 having a diameter of 0.05 cm or less. The location is positively supported on deflection rollers or rollers 76 arranged at a horizontal distance from one another d 71 'under the St your action of the switch · 14 for the vertical Before se hu BMOT or and the drive shafts 76 are controlled via the control device 12 for the Quervor-SOhutmotor "The pen 7M is a brush with a waagecht extending rail 77 in electrical connection, which in turn is connected to the line 64 on which the facsimile * igml · appear. The photoelectric-analogue facsimile signal on the output filter 21 is obtained from a scanning device which moves on the same path

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like the pen 7 ¹ U The corresponding photo cell can be provided in the same write head that also carries the pen '74. Of course, a physically separate photoelectric recording unit can also be provided, which synchronously follows the same path

According to the proposal from US patent application 579 772 from Ip. September 1966, a multi-layered »'er f rager is passed through the printing unit 11, which carrier has a thin conductive metal foil 78 in contact with the pen, which carrier also has a sheet of paper 79 and between the sheet and the sheet of paper a coating (not shown) on the sheet 78 , which consists of a substance that can be transferred from the film to the paper when exposed to heat. A stationary metal volume can also be used, in which case a layer which allows material transfer under the action of heat is moved together with the paper through the printing device. This is also described in the US patent application just mentioned. The metal foil 78 is in electrical contact with the metal sliding shoes or sliding surfaces 72 and 73 * if it is moved by virtue of the pressed rollers 71 and 71 * ^ and the pen 74 is at its tip in a metal-to-metal contact with the conductive Surface of the film 78 * So that this metal-metal contact is achieved safely, a support plate 81 is provided over the entire width of the scanning movement of the pen 7 ^. When the drive rollers 46 move the pen over the width of the film 78 while rotating, the electrical signals which arrive via the line Sk generate local heating due to the resistance of the metal! "" Met al Icontact it between the tip of the pen 7 * t and the electrically conductive surface of the foil 78, so that the heat transferable substance, which is arranged between the foil 78 and the paper 79, is transferred to the paper, whereby the desired pattern is then transferred or picture is created »

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For control purposes, the input switch 82 supplies a signal on the line 15 when the paper sheet enters the vertical feed, which is formed by the roller 71 ^ and an output switch 83 generates a signal on the line 16 as long as paper is below the output side Valze 71 * is available. The vertical; Feed 12 for the paper and cross feed 1 $ for the head are controlled by the output variable of the AND gate 88. The converter 85 is designed in such a way that when the switch 83 is closed, whereby a signal is generated from the line l6, no output signal is generated which would affect the flip-flops 84 and "

87 resets, but when the switch 83 is opened, the signal on the line l6 after passing through the converter 85, the flip flops 84 and 87 resets. The output of the converter 85 becomes also applied to a flip-flop 86 for resetting, which by the output variable of the AND gate 88 in the other direction has been adjusted. The inputs to the AND gate 88 come from

from
Flip-flop 84 and a line 89, which is connected to the changeover switch 10 for sending or receiving and which then conducts current when the switch 10 is in the corresponding position in sending, which is indicated by +, or in the receiving position of a flip -Flop 87 when a signal indicating the presence of a carrier wave appears on line 31. An output j appears

at AND gate 88 when the arrangement is switched to transmit, and the switch 82 is closed to a signal on the line 15 to generate, or in the receiving st el Iu ng when the switch i'st closed and a signal indicating the presence of a carrier comes from detector 56 via line 91. ';

The flip-flop 86 is switched in such a way that when switching to one state it starts the transverse feed 12 and turns it on Input signal through the send contact S of a switch 59 to:

AND gate 93 sends, which sends the carrier signal from line 36 to the transmitting contact when both Eiiiangssignale are present the switch to be operated when sending or receiving

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30 sets. In the other state, the flip-pip 86 holds the cross-advance lift motor 12 on «The transverse guard hat motor and its control circuits 12 know. sen one not shown; © marking «and braking device on, so that once the stop signal has been applied, the cross feed starts stops at a marked point or a detectable point and that the sender and the receiver of the start from the same marked position *

The device 11 for printing and scanning also has a feed 94 for film and paper ₃ which is controlled by the switch "10" and pushes the film and paper support 78 or 79 into the input handle under the roller 71 -when the * switch 10 is brought into the reception area in order to prepare the current arrangement for recording a "broadcast",

Operation according to the invention will now be described. First the relevant recipient is notified by a normal telephone call from the location of the sending station that a facsimile transmission is to be transmitted. Then the earpiece is attached to the corresponding one at the receiving station and at the sending station Transfer coil attached. Send it since the earpiece Mounted in the coil 39 and the receiver since the earpiece is arranged in the coil 51, as indicated in FIG. 4. In the receiving station, the Sehalter 10 is on receiving placed and in the transmitting station of the switch 10 to send. Then the template to be transmitted is placed under the Roller 71 inserted, which guides the original past the scanning station, in which the photoelectric head, not shown, scans the original. The drive of the roller 71 begins with the Sohllessen the switch 82, which is activated by the insertion of the Template is actuated to a signal on line 15 to generate, which switches the flip-flop 84 into a position ' and via the AND gate 88 the sheet feed and the cross feed leaves. The same signal also switches the IJND gate 93 on - so that

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the carrier signal is given on line 36 on the telephone line will. The transfer continues until the sheet of paper attaches the two switches 82 and 83 has passed, which open of switch 83 generates the signal on line l6 which, when converted in converter 85, resets PLlp-flops 84 and 86 and stops both vertical and transverse pre-stroke. As before indicated above, the drive holds the cross feed at a marked or predetermined position.

At the receiving station, depressing the receiving switch 10 causes the paper feed 94 to push paper under the roller 71. If the switch 82 generates an output signal on the line 15 when a sheet of paper is fed in, then this sets the flip-flop 84 in one state. Now nothing happens on the receiving side until the input of the carrier is detected and a signal is generated on the line 91, which runs through the flip-flop 87 and the AND gate 88 to put the flip-flop 86 in the first position to bring and the paper feed motor 12 and the cross-feed motor 14 starts. The appearance of a signal on line 16 from scraper 83 does not trigger a switching process at the beginning of reception. Both motors on the receiving side run until the substrate from layers 78 and 79 passes switch 83, the circle (

opens and takes the signal from the line 16, whereby via the Converter 85 both the paper feed and the cross feed are stopped, the cross feed remains in a marked position. If no more carriers are received on line 81 then this does not prevent the synchronous operation of the drives. This means that there is syichonism throughout the entire broadcast ensured and a certain starting position is for the next transmission already determined if a given transmission is terminated. <

Of course, the invention is not 1st on the use of the \ printing or scanning device described and the corresponding!

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Coupling to the telephone network is limited. In particular, the binary information transfer of only black and white information be carried out with other printing devices, namely Including those prints that up to a certain degree Can print shades of gray, wd.1 actually only such printers print out in black or white if they are fed with real binary signals · Apart from this, a variety of features depend on the present invention does not depart from magnetic coupling the telephone receiver and - as already mentioned - ice cream can certainly do also worked with the current connection to the telephone network will.

All details shown are important for the invention,

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Claims (2)

1537231 Pat ent of sayings IJ device for the remote transmission of images with a photoelectric scanning device for generating the transmitted signals and means for synchronization with the same receiver since ig on a st eilte device, characterized by: a quantizing device for converting the analog, obtained in the photoelectric scanning Signals into a binary signal, one level of which is black and the other level is white detected levels of the original j a converter for generating a multi-level signal from the binary signal for transmission with partial response transmission (. Partial response transmission}} a device for modulating one over a narrow band transmittable carrier frequency with the multi-level signal; a demodulating circuit for the recovery of the multi-level signal from the carrier} a decoding circuit for generating a binary signal generated from the multi-level signal corresponding to the end-side; a cover device that switches off the no-gray tones on the transmitter side scanned pattern prints corresponding copy in accordance with the binary signal generated by the receiver; a coupling for anaohal-j th of the device to a telephone voice line either to transmit) the corresponding scanning of the modulated signals or to receive modulated signals from a similar remote device to print a copy according to the scanned-i th pattern. 2. Device according to Ansprufc 1, characterized in that it is both for sending as well as receiving magnetically (inductive) to the Earpiece of the handset of a telephone * connected Alt 3. Apparatus according to claim 2, characterized daduroh that for coupling at least two coils surrounding the * η · ηcoil of the earpiece are arranged coplanar to this, and that for coupling the tue idem Telephone network incoming signals to be received at least awei 909835/0757 - © AD ORIGINAL Coils are provided, which switches ausammenge to Ent hum are. 4. Apparatus according to claim 1, characterized by a highly stable local oscillator and means for time elocking of the van der Quant isierschaltung generated binary signal with a from the frequency of the stable oscillator B determined the "frequency for Generation of a master-controlled binary signal (clooked binary signal) to forward over the channel. 5. Apparatus according to claim 4, characterized in that the time-controlled Signal is one which changes its state when the bits of the binary signal are at one level and its State does not change when the bits of the binary signal are at the other level, and that these timed binary signals In partial response transmission be transmitted on the modulated carrier that the device to Reception from another device means for obtaining a multi-level signal from the modulated carrier, which corresponds to the time-controlled binary signal from a transmitting station, and that the device has a device for decoding the multilevel signal to maintain a Bdnärsignales, which) of the Quanbisier device of the transmitting station generated binary B ig rial corresponds to 6. Apparatus according to claim 1 or 5, characterized in that for Processing of binary signals are provided: a) a pre-modulation low-pass filter for converting the binary signal l) i a multi-level signal} ■ ι b) a carrier frequency oscillator that is close to the upper frequency limit of the canals »swings | c) a matched. BaslBbandamplltudenmodul & gate for modular lying des TrAe β "8 with the multi-level signal ι ^ · - 19 - ■: ■. ■■ d) a remainder of the band filter to limit the bandwidth of the Aub-. , · Gangs ales modulator; e) a transverse filter for the vestigial sideband signal, wherein the filter and the modulator are shifted in frequency and generate the inverse signal which corresponds to the binary signal and is changed in such a way that essentially the entire bandwidth of the channel «β is used and that amplitude and phase distortions are compensated which are impressed by the transfer function due to the circuit elements and by the narrow channel through which the signal passes. 7 · Device according to claim 6, characterized in that the highly stable oscillator according to the pulse number of those bits is phase locked to the one received by the transmitting station modulated carrier «» 8. Device according to claim ?, characterized by the following feature « the scanning device and the deck device: A device for advancing a sheet of paper at a constant speed across the direction of the feeding or printing a motor to drive the abbot across the sheet, in the direction of the abbot; ■ I a device for deriving a frequency from the frequency of the highly stable local oscillator, which is used as a factor in the OscillatorfrequenS # t * hold en; and means for controlling the speed of the motor; in accordance with this lower frequency thus obtained. 909835/0757 BAD ORIQJNAt - 20 - g, Geräfc naoh claim 4, characterized by: a device for phase-locking the highly stable local oscillator in accordance with the pulse frequency, which is of the modulated carrier is obtained, which is from a same remotely located device is obtained; an execution in the scanning and printing device to achieve a uniform relative speed in the direction of advance, i.e. transverse to the direction of movement of the downward touch or pressure device j a motor drive for repetitive movement of the scanning head across the paper, i.e. perpendicular to the feed direction; a circuit for deriving a frequency from the frequency of the local oscillator, soft derived frequency numerically as. Factor included in the "oscillator frequency is lstjund Means for controlling the speed of the motor drive in accordance with this smaller one derived from the oscillator frequency Frequency. \: " Mürrchen-Pulloch χλ Γ Witner Str. 2-TtI. MSiMhM 7,067Ο ["■■■" K / Mü Munich-Pullach, August 25, 1967 Title: Arrangement for the transmission of images with scanning of the Originals and record a copy of them Applicant; Phonoeopy, Inc. EXPLANATION ϊ, *. ί » " In US technical language, "modem" is understood to mean a modulator-demodulator transmission over a given transmission to Modulate suitable form for the transmission line and the modulated on the receiving side Signal again demodulleen, whereby the input signal, e.g. the binary signal or the speech signals again can be obtained. 2. With "partial response trarsmi'ssion" the following type of transmission is referred to: A two-level (binary) signal is given over a transmission line that has a slow response, so that the amplitude of the received signal does not only depend on the level of the transmitted binary signal depends in the respective time interval, but also on what value 3m previous time interval the signal had. This procedure is described in the Kretaer article cited in the registration forms, which can be submitted to the examination body on request. - * - With this special transmission method, a three-level signal is received, which is shown for example in Figure 3 of the mentioned article by Kretzmer, "If the received signal is at the highest amplitude, then it always means a binary one and if the signal is at the lowest. Level 1st, then it is always interpreted as a binary zero. But if the signal is at the middle level of Figure 3 of the article before Kretzmej? is _t diarm, it will be interpreted as one if the preceding » _t 909835/0757 BATH de bit was a binary zero. The signal appearing at the middle level is then interpreted as binary © zero if the previous bit was a binary one. In this way, the system can correct the binary signal _similar Üb®raiitteln and above all properly received * although the response lf so slow that only _a part of response takes place. 3, The term "clocked binary signal" is also borrowed from the L * S ~ technical language. Such a signal is a two-level signal _s which is converted into another different two-level signal, in which second signal the level only changes synchronously with the impulses of a local oscillator or pulse generator. This method can be seen at first glance from FIGS. 1 and 2 of US Pat. No. 3,162,724. The U.S. patent was published on December 22, 1964. . In the documents of the present patent application, such “clocked binary signals” are also referred to in some places as “controlled binary signals”. Another or better German expression for the American technical term "clocked binary signal": is not known here; testing s st el Ie a better education) pressure should be known the applicant for release would be grateful. 909835/0757 Location