DE1762410A1 - Facsimile facility - Google Patents

Description

M 2396

Minnesota Mining and Manufacturing Company, Saint Paul

Minnesota 55101 (V.St.ν.Α.)

Facsimile facility

The invention relates to facsimile recording and playback systems. With the device according to the invention is intended primarily an indirect coupling between a facsimile unit and a facsimile transmission device can be established The facsimile unit has a facsimile transmitter which is a Converts the image of a document into an electrical signal. The document to be reproduced is scanned line by line, with the result of the scan consists of an electrical signal. This electrical signal is supposed to be sent to a distant location and is used to »create a duplicate of the document.

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The electrical facsimile signal generating station and / or the remote station is equipped with facilities which convert the facsimile electrical signals into visible information convert which forms a duplicate of the document represented by the facsimile signals.

The invention now relates to a device in which the electrical signals are not transmitted directly from the facsimile transmitter of one station to be sent to the facsimile receiver in another station, but the signals are gate and / or after the Sending out saved on a magnetic tape. The transmitter is then connected to magnetic tape recorders in both stations. the Facsimile signals generated in the one station are recorded first and reproduced later, and the reproduced signals are sent to the other station * The station receiving the signals also records the signals first, and the duplicate is later assembled from the reproduction of the recorded signals.

The communication of the facsimile unit with the tape unit, whether for recording or for reproduction, takes place at a speed which corresponds to the scanning speed of the facsimile unit. On the other hand, the transport of tape devices on the transmitter is preferably carried out at a higher belt speed to the transmission time to rerkürzen · Even if the transport of tape devices would occur with each other at the same speed, takes place nit with the transport of a tape recorder with the relevant facsimiles, it is the transmission system is used economically in particular when the number of documents to be reproduced is quite large . Are the facsimile units directly connected to each other , with the sender side

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an exchange, the end of the document and a delivery on the receiving side takes place with new paper, there is a pause during which the transmitter is actually not used. On the other hand takes place The remote transmission ron tape device to tape device, the entire sequence can sound electrical signals for a large number of Documents are transmitted in a continuous operation without pauses, which means that the time periods are omitted on the sender side which are required for exchanging τοη documents and receiving them for laying the paper in hay *

The invention provides an improved control of the belt drive for such a system. The tape drive is set up in particular for recording a paksimile signal and contains an induction motor which is operated with Metzstrom and which controls or controls the τοη of a control circuit will. This control circuit supplies a direct current component to the induction motor, which applies a third deceleration torque to the motor exercises. The generated direct current component is superimposed on the alternating voltage supplied to the induction motor so that the Impedance in the alternating current supply circuit for the motor for half waves with only one particular polarity is changed so that the alternating voltage supplied to the motor has a residual direct current component. a silicone-controlled rectifier, 4s the special resistance for the induction motor in particular for the Main field winding switched on and off.

The silicone-controlled rectifier is based on the phase of the alternating current at a certain phase angle fesümdet. The ignition angle determines the strength of the equality

component that is superimposed on the supply voltage «The ignition angle tone is determined by a control circuit which converts a direct current control signal into a phase angle of an ignition pulse for the silicone-controlled rectifier. The one that determines this ignition angle A direct current signal is generated by suitable circuit elements both during recording and during playback. The DC control signal has a constant value, see above that the phase angle is kept constant during the recording. During the recording, the tape is moved forward by the motor, while a certain and constant braking force is exerted on the motor. When recording, the JäkelmlIedaten are recorded on the tape together with a constant frequency having reference signals, with a constant phase relationship is created between the facsimile data and the reference signal, which serves as a relative time base for the facsimile data, so that the waves of the reference signals recorded on the tape Create a reference point for the facsimile data recorded at the same time

When reproducing the signals, separate signal sequences are generated, namely a sequence for the facsimile data and one Sequence for the reference signals · Thereafter, the phase of the reproduced reference signals becomes approximately the phase of the reference signals rergliohen from the same signal source that was used when recording was used · In the preferred method according to the invention the tape is moved at the same speeds during recording and reproduction, and the frequency of the reference signals either of the reproduced reference signals or that of the Playback tSrtlioh generated reference signals must τοη the frequency of those reference signals differ when recording with

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The phase comparison takes place at different belt speeds is therefore only performed between signal sequences with a comparable frequency

The phase difference is constantly monitored, and it a corresponding direct current signal is generated · The direct current signal represents a real deviation signal and is for a Maximum value of deviation signal frequencies of a few Hertz treated. The treated signal is used to generate the direct current control signal, with which the above phase angle for the motor control circuit is determined. Changes during playback the braking torque exerted on the motor to ensure a constant phase relationship between the reproduced reference signals and the at the same time generated reference signals to maintain. Between the Motor and e.g. the drive roller for the magnetic tape, a gear is arranged with a variable translation, so that the different Speeds can be generated.

The forwarding of the facsimile information includes im generally three different work processes with the exception of the finite transmission time of the electrical signals. First will by scanning a template line by line, an image is converted into an electrical one Signal converted, further generating a signal whose characteristics change in accordance with the changing Contrasts of the image change the length of the defrosting parts. Secondly this signal is then sent from one station via suitable transmission equipment sent to a second station e.g. via telecommunication lines, teletype lines, radio transmission systems, etc. Thirdly, the received signal is used in the second station to control a process, based on an image of the original «Is composed.

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The assembly of the image in the second station must take place at the same time as the generation of the electrical signal in the first station, which means “that the two facsimile units must work exactly synchronously. Such a synchronous operation can be achieved if the two stations are either supplied with electricity from the same power or via a power supply network However, there is no such line network extending over the whole country, so that the necessary synchronous operation does not exist In all cases it can be achieved. Hit the invention, this disadvantage is to be eliminated, also taking the fact into account is carried that a record τοη facsimile information more and more is required when the transmission lines τοη other telecommunication devices are shared, or if several copies of the transmitted image information are to be made at the receiving station τοη *

According to a further feature of the invention, the line-synchronously generated facsimile signal is first, for example, on a magnetic tape recorded together with a line-synchronous reference signal. The recorded facsimile signals are played back for transmission, the movement of the tape being regulated in the direction of a certain relationship, e.g. to establish a fixed phase relationship between the viewed reference signal and a normal, malfrequeni, which is derived from an oscillator working with a constant frequency reproduced facsimile signal is transmitted. The reference signal is not transmitted with the exception that the reproduced reference signal is a component of the fake information signal. on the receiving end · the facsimileifnal is received «ad together ■ raised with a standard signal. I to put it together

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of the image, the recorded signal is played back, and the Playback speed, e.g. the tape speed, is regulated again in the direction of a certain relationship, e.g. by a establish a fixed phase relationship between the reproduced reference signal and a mains current synchronization reference signal, wherein the network frequency controls the image composition in terms of phase. The timing of each unit of information is very important in a facsimile signal, as any delay or impermissible advance of one signal part with respect to the other signal parts increases can lead to a distortion of the reproduced image «

Such timing discrepancies occur during the generation of the facsimile signal and during the reassembly of the image, primarily as a result of a lack of constancy of the scanning speed and as a result a non-synchronous working of the receiving and sending stations If such image information is recorded on a moving storage medium, e.g. on a magnetic tape, and later by If this is reproduced from this, further deviations are introduced through the recording as well as through the reproduction. These deviations are mainly the result of an uneven Movement of the storage medium. In this case there is twice the Possibility of deviations, once during recording and again during playback · If both the sending and receiving stations facilities for recording * Ben and play show, eo the risk of deviations occurring is doubled again. These deviations are collectively referred to as Zeltrersohiebungsabänderungen, because the phase (timing) between successive signal parts changes as a result of these deviations.

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With the invention, any deviation should be prevented as far as possible, which can be caused in these recording and playback methods. Should image information such as a facsimile signal can be recorded on a storage medium, e.g. Information is defined by a temporal characteristic of the recorded signal, a carrier frequency signal can be defined by the Facsimile information signal can be frequency modulated, for example. That modulated carrier signal is then recorded. At the same time, a reference signal is recorded on the tape, preferably in a second track, e.g. the carrier frequency signal itself or a signal, which has a fixed relationship to the carrier frequency.

It is essential that the reference signal has a constant frequency and a time base for the information signal forms. The phase relationship of the information signal to the on The reference signal recorded on the tape remains constant even if the tape speed changes during recording. This phase relationship appears as a certain gradual relationship between the recorded information and reference signals, even if a recording is somewhat distorted by fluctuations in tape speed. The tape drive device, e.g. a motor driving the tape during recording can be precisely regulated in terms of speed and position. This is but not absolutely necessary. Likewise for this purpose a servo soleplate can be provided.

If the recorded data are to be processed further, bo the recorded information and inspection signals are vo « Tape read. The same or a different set of transmitters can be used for the reproduction to follow between signals

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to generate * One signal sequence represents the information signal as it was originally recorded and which is now reproduced. The other signal sequence, the recorded time basis or the reference signal. The reproduced information signal is now preferably treated so that a pulse train is generated, in which the distance between the pulses representing the information, of course, a constant distance either a constant Inform _ation value or an unmodulated carrier signal means «

These information pulses are individually delayed with the help of an adjustable delay device, which preferably consists of a voltage-controlled monovibrator. The voltage control of the monovibrator changes its unstable period. The input of this monovibrator is the pulses of the data pulse train, each pulse of which triggers the monovibratorThe trailing edge of an output signal from the monovibrator represents the delayed information signalThe delay, if this is constant, therefore simply represents a constant phase shift between input and and output pulses, whereas a variable delay in the signal sequence introduces additional modulation. The signal sequence derived from the monovibrator is either forwarded to a remote station or used to control the composition of an image .

The reference signal reproduced by the movable storage medium is treated in two ways. First of all, the reference signals control the drive for the moving medium,

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e.g. the tape drive motor, with changes in the phase and frequency of these reproduced reference or time base signals can be used to influence the instantaneous speed of the motor For this purpose, a reference signal with a constant - preferably Frequency e.g. in a phase detector with the reproduced Check the reference or time base signal, and the phase difference is used to influence the engine speed

As already mentioned, the motor can consist of an induction motor that is operated with Jietzetrom, its frequency has a certain degree of constancy. However, this is not enough, which is why an attempt must be made to make short-term changes to eliminate the speed and the phase of the motor and the belt that the motor as a function of τοη the comparison between the reference signal having a constant frequency and the reproduced reference or time base signal is decelerated

The servo loop, which regulates the belt speed and tries to eliminate the time shifts, does not respond completely to flutter frequencies in the order of magnitude τοη 10 Hertz and higher. The servo loop essentially responds to quasi-stationary deviations with very low frequencies . To a higher frequency having ZeitYereohiebungsabweiohungen eliminate is reproduced Bezugseignal to ■ another way · treated Of these reproduced compensation signal θ η a Sohmalbandfrequenzdiekriminator is operated with a Aufgangs generated eignal eioh "whose amplitude changes only within a · eohmalen frequency range, which includes the lowest frequency . Outside the narrow frequency range, the output signal is constant. On the other hand , the above-mentioned phase difference signal can also be used to regulate the motor. -

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The output signal of the discriminator or the phase detector is passed through a low-pass filter that determines the frequency of the reproduced reference signal itself is eliminated as well as random voltage peaks, etc. The pass band of the Filters is essentially limited to the flutter frequencies. This filter is preferably also assigned an impedance element which gives the filter pass-through properties in which from the pass band direct current signals and quas! stationary Signals are excluded that represent these time shifts that the servo loop is supposed to eliminate. The exit from this bandpass filter is then used for influencing the delay of the above-mentioned delay device in the facsimile data transmission channel, e.g. the output of the bandpass filter controls directly the voltage of the monovibrator serving as a variable delay device

The device therefore eliminates the remaining signal distortion which is a result of the tape flutter. It will pointed out that the servo loop on the one hand regulates the movable medium, e.g. the magnetic tape, not necessarily in the direction of a constant speed but in a Way that the reproduced reference signal has the same frequency and phase as the reference signal with which the reproduced Reference signal is compared · This is not necessary to a constant tape speed, as fluctuations may have occurred during the recording. That recorded at that time The reference signal may have a variable wavelength on the tape, so that playback at a constant tape speed will result in a signal of varying frequency and phase.

With the control of the belt movement the reference signal

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are reproduced with constant! frequency and phase, for which different tape speeds are actually required can. As long as the reproduced reference signal has a constant frequency, a correct time base is created for the information signal. Sa, however, the reference signal is always still changed as a function of τοη flutter frequencies, the Modulation of the information signals by the flutter frequency of the open loop deceleration control device of the invention is eliminated.

The invention will now be described in detail. In the accompanying drawings the

1 shows a block diagram of a station with a facsimile unit and a magnetic tape recorder according to the invention, Fig. 2 a circuit diagram (partly executed as a block diagram) the control circuit for the belt drive motor of the system shown in Fig. 1,

FIG. 2a shows a position of the waveforms occurring in the circuit according to FIG. Fig. 3 a circuit diagram (partly executed as a block diagram)

a modified and simplified design of the engine expensive kr · i ··· according to FIG. 2, 4 shows a circuit diagram for a modification of the circuit according to of Fig. 3,

5 shows a circuit diagram for a facsimile system in which different reference signals θ are used during different modes of operation,

6 shows a circuit diagram partly executed as a block diagram for a fake data reproducing unit, which is a preferred embodiment of the invention, and dl

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7, 8 each shows a representation of curves which relate to different units shown in lig * 3. In the embodiment shown in Fig 1 _e preferred embodiment of the invention, a Fakeimilesender 10 is provided, which scans a document and converts an image of the document into a low frequency signal in a base band region. The signal is fed to a circuit network 11 in which electronic circuit elements convert the output signal of the facsimile transmitter 10 into a signal suitable for recording. The network 10 may contain, for example, an audio frequency isolator or a device that receives such vibrations when they are generated in some other way. These vibrations are used as a carrier signal and are modulated by the facsimile baseband signal.

The output signal of the electronic circuit network 11 is passed through a mode switch 12 when recording should take place · If the switch 12 is switched over, the device is set to "playback", with the output side dee Circuit network 11 is separated from the circuit shown. For recording the facsimile data generated by the transmitter 10

a second mode switch 15 is also required, which is set to "Station ¹¹ " · The switch 15 can also be set to "Outward", as will be described later. set, a data transmitter 1b can receive the facsimile signal processed by the network 11, the signal being recorded on a tape 20.

The tape 20 consists in particular of a magnetic tape, on which the transmitter 16 follows a special track · If the Company owner 12 switched over, while switch 15 was in the

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The "Station" setting remains as shown, this is how the .Data transmitter 16 as a reading or playback transmitter and leads hence its output signals to an electronic display network to "that contains a demodulator" The output signal of the network 17 consists of a facsimile baseband signal and, more particularly, a sampling signal that directly represents facsimile image information represents "This facsimile signal is passed to a facsimile receiver 18, which generates an image" converts in particular the receiver 18 converts the electrical signal from the network 17 into optical contrast information, for example by operating a Facsimile printer «The printer can have a stylus, whereby the image is produced on a pressure-sensitive paper «

With the other setting of the operator 15, the data transmitter 16 is connected to a facsimile signal transmitter, the electrical signal read by the transmitter 16 from the belt 20 via a line 19 to a remote facsimile sender and to a receiver of the embodiment described above.

The belt 20 is moved forward by a belt drive 21 of suitable design. The belt drive can, for example, contain an alternating current induction motor, the speed of which is determined by an adjustable electric current signal. The magnetic field influenced by the direct current exerts a braking effect on the belt drive motor If the amplitude of the pull current signal is changed, the speed of the motor is changed accordingly. Si · Control circuit for the tape drive, let al box. 23 symbolically shown · The IT network 23 receives the Gtleiohatrom control signals from a channel 23a and treats these · signals in such a way that the belt drive 21 works with a signal composed of elnea alternating current and a direct current, so that the belt geaohwia-

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ity follows the command of the direct current signal from channel 23a.

An operating switch 22 mechanically connected to the switch 12 connects the input channel 23a to a DC voltage source 24 during recording, with the tape speed

is regulated according to the open loop conditions and according to the control signal sent to the control unit 23 is supplied from the voltage source 24 · When recording A signal source 25 generates an alternating current output 3 reference signal, which is sent via a third operating switch 32 to a second transmitter

26 is directed. The transformer 26 writes on the tape 20, a second parallel lane ₉ in particular, the frequency having a constant signal from the reference signal source 25ο

For playback, the two operating switches 22 and 32 are switched over. I) The reference signal transmitter 26 also works as a playback transmitter and reads this second track. The reproduced AC signal is fed to a suitable signal treatment means 27, the Z ₉ B. modifies the frequency of the signal to a suitable value. The relevant output signals of the reference signal source 25 and the signal processing device

27 are passed to a phase detector 28 which generates a direct current signal. The frequency and the phase changes of the reproduced reference signal (output of track 27) actually represent the speed β changes of the belt 20, which during occur during the recording, as well as the changes in speed of the tape during playback · The frequency of the signal source 25 is assumed to be constant to an extent that far exceeds the constancy of the belt speed. The phase and frequency relationship between the direct and the reproduced reference signals at any point in time therefore controls the gleiehstron output signal

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the phase detector, which in turn drives the tape towards a constancy, the GKLieliestromausgabe of the phase detector controls · The belt drive is therefore with respect to a constant phase and frequency of the reproduced Bessugssignale with respect to the direct reference signals an opposite equal tape speed variation the reproduction of this part of the track are accidentally compensated It is essential that the phase relationship between the facsimile * data and the reference signal on the tape during recording as a certain spatial relationship is maintained regardless of the speed fluctuations · This phase relationship becomes still maintained during playback and regardless of the speed fluctuations · The tape control makes the phase of the reproduced reference signals depending on the phase of the direct reference signals, so that the reproduced. Data among each other have the same and correct phase that they had during the original generation "

A speed selector 30 can also be seen, which changes the frequency of the reference signal source 25, and also a corresponding change gearbox 29 gate is seen, which is arranged between the drive 21 and the belt 20 · On this way know the same data and the reference signal can be recorded and reproduced with different operating speeds, What is the possibility of the tone of large coats, if the system is very should be operated effectively · BIe playback and dl · transmission Sound facsimile data can pass at a high speed. leads to the transmission since to rerkUrsen Bio fakslmlle-

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initiate yourself can work slowly if this is more economical is. Between the stations there is a direct connection between the belt units, with the aksimile unit in each Station is only directly connected to its own tape unit and is temporally independent of the actual remote connection, so that the lower charges can be taken advantage of during the night when public trunk lines are used · However is a slow speed jraksimile unit more economical. If several documents are to be duplicated, no time is wasted exchanging the documents (and the sheet of paper at the receiving end) as with unused transmission times * The recording of the facsimile signals on the tape takes place with pauses, as they are required for changing the documents, and also the playback of the tape recording for assembly the picture in the other station. The reproduction of the tape signals for transmission and corresponding recording of the transmitted signals is carried out continuously.

The plant · In a special station therefore has four different operating modes. The first operating mode of the station consists of the recording, in which all operating clients 15 »12, 22 and 52 are in the setting shown. The speed selector 30 selects a small recording speed, for example. The facsimile sender 10 generates from a scanned document Signals and the corresponding data are recorded on the tape by the transmitter 16 »At the same time, the transmitter 26 is on the tape recorded in a second track associated with the low speed (low-frequency) reference signal. If the Record or record lakeimlleelgnalen for several Documents ended some time later let, v.ad not

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necessarily immediately follows, the system can refer to the Playback away operation can be included. The desk 15 will be set to "Away *" and the operation switches will be 22 and 32 to "Playback", with the setting of the switch 12 is insignificant · The speed selectors 29 and 30 are preferably set at a fairly high speed. The tape is therefore advanced rapidly by the tape drive 21, wherein the transmitter 26 monitors the control track and the phase detector 28 generates a DC control signal indicative of the tape speed regulated so that the frequency and phase of the reproduced reference signals are kept constant. At the same time, the transmitter H reads the satellite track and forwards the reproduced facsimile data to the transmission line 19 »which sends the data to a remote location Facsimile receiving and sinking facility directs · The procedure carried out in the remote station can best be seen from the Description of the third way of working, which is the waiting-recording-way of working

In this mode of operation, since the switch 15 only switches between external modes, the operating mode remains in the same setting as in the outward reproduction mode and distinguishes between two station operating certificates. The line division of the operating holder 12 is also insignificant in this case, -but the switches 32 and 22 are set to "recording" · In this mode of operation, data are received via the transmission line 19 and recorded on the tape 20 falls the speed selectors 29 and 30 to a · high Speed set, and the train signal transmitter 26 records the control track that accompanies the recording of the data

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Voltage source 24 controlled

The last and fourth modes of operation are the station playback mode, where the data is read from the tape and can be combined to form a picture The operating switch is in the setting shown, while switches 12, and 32 can be set to "playback". Playback should be done at a low speed, bo that the Speed selectors 29 and 30 can be set to a low speed · The tape drive 21 is controlled by the phase detector 28 controlled using a low reference speed The reference signals generated directly are compared with the reproduced reference signals, the output of the phase detector 28 controls the belt drive 21. The transmitter 16 outputs the facsimile data again and forwards it through the switches 15 and 12 to the electronic playback unit 17 for demodulation. the Signals control the image generation in the facsimile receiver 18

From the above description it can be seen that the transmission of the images is carried out indirectly with the aid of the tape recording, so that the transmission via the transmission line is independent of the conversion of an image into Γοπη of image information into electrical signals and vice versa Xs It is also important that the different tape speeds enable transmission at a higher speed than when scanning «

The Iig * 1 also contains a modification with which the use of a trailing signal transmitter 26 is avoided, ie the use of a special trailing track is avoided. In this case, the B "iug" aignalqu "ll 25 can be seen as being built into the receiver electronics 11 or the facsimile unit

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and can therefore also be omitted as a separate element but retains the functional identity as a reference signal source for the purposes of the invention. In this embodiment it is necessary that the reference oscillator also drives the drives of the facsimile sender and receiver It is essential that that an exact phase equality between the facsimile modulated Carrier recorded on the tape and the scanning in the facsimile unit · In this case, it can recorded carrier signal can be used for control purposes. Therefore the limiter 31 shown as an alternative element can be connected to the display electronics 17. The output signals of the limiter 31 consist of individual signals equal to the signals generated by the data transmitter 26. During playback, will the tape drive is controlled in a similar way by converting the output signals of the limiter into a pulse train compared in the phase detector 28 with the same oscillation which drives the facsimile sender and the facsimile receiver controls

The preferred method for controlling the tape drive during playback and recording can be seen in FIG. 2 , welohe element "with the capacitor 104 in" inen circuit are connected · the motor may be made in the übllohen Wei "· to a power source · HS" schlose "n _t dl" from the Netzetromleitung 110th

The engine 100 is normally run with, "nttdrahiahl at loading, is dit shown from the tape drive. If the main winding 102 is supplied with a direct current component, ao iat

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the rectified magnetic field component stationary with respect to the rotor while the induced alternating field rotates «The stationary rectified magnetic field is equivalent to an overload and therefore has a braking effect on the engine. The DC voltage is supplied to an AC power source 110 via a rectifier taken, e.g. via a silicone-controlled rectifier 111 which is connected to the Weohsel current source 110 via a resistor 112. The rectifier 111 conducts only during a half cycle of each full wave of the AC voltage. If the rectifier 111 supplies a half-wave to the main winding 102, the Height of the half-wave corresponding to the value of the resistor 112 ge> -damped, whereby the impedance in the circuit for the Hauptwioklung 102 is changed · According to the illustration, the resistance consists of a sail resistance, and with the help of the movable contact the motor speed can be adjusted somewhat by changing the direct current flowing through the motor for a given Firing phase angle of rectifier 111, as necessary to achieve "correspondence between the bands, dl · provided with a recording on one device and on the can be played on another device «Although the system is pnaeen-bound during playback, as will be described later No Vrequenssohleife provided in the servo device that the Vaccination area limited · The frequenceohltlfe is called βölohβ vom Motor shown running at a nominal diameter between the two the individual devices due to the differences in the motors and the load duroh the friction is different, so that one The division is carried out by bus so that a formaldrthsahl is achieved for the devices.

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introduced DC component depends on the time period in which the rectifier 111 is actually conductive within each half cycle. For the purposes of description, one poeitiyen half-wave spoken when the polarity of the half-wave allows the rectifier 11t to conduct. The control electrode of the silicon-controlled slide rectifier 111 is connected to the secondary winding 121 of a transformer 120! while the the other side of the secondary winding 122 is connected to the cathode of the silicone-controlled sliding earpiece 111 the rectifier 111 is ignited and remains conductive until the voltage on the main electrodes reverses polarity

The direct current component introduced into the excitation circuit of the motor depends τοη the ignition angle for the rectifier 111 in addition to a near above zero crossing of the positive half-wave of the alternating voltage of the supply current, so that the effective direct current component in the excitation circuit of the motor can be changed so that the ignition angle for the rectifier 111 is changed % vm Irseugen the appropriate ignition angle a special signal is sent to the primary winding 121 of the transformer 120. You task of the transformer 120 ordered a steep voltage pulse, especially a voltage pulse with a steep one front flank · at a certain point in time in relation to 41 · phase of the voltage of the voltage source 110 · it ·· phase relationship should be changeable in accordance with the "required control of the motor · 100" a head 125 be dependent·

You Gleiehepantong on the ladder 123 «at one

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Equate speed or time shift deviation signal during playback, as will be explained later 124, which serves as a current source for a capacitor 125 together with a diode and a resistor network 126.The diode-resistor network 126 connects the emitter electrode of the transistor 123 to B ⁺ , with a capacitor 125 connected between ground and the collector electrode 124. The DC voltage on the conductor 123, which is fed to the base electrode of the transistor 124, determines the degree of charge of the capacitor 125 "If the charge has reached a certain level, the voltage across the capacitor 125 acts as the ignition voltage for a transistor 127" one of which Base electrode is connected to B ⁺ while the other base electrode is connected to primary winding 121 which is grounded on the other side »

The lying across the main electrodes of the transistor 127 effective potential is influenced by a gate circuit, g a transistor 130 includes whose base lmitter path zwisohen Irde and the one terminal of the power source is gesohaltet 110 · The connection 131 provides susätelioh a suitable reference point in The collector electrode of transistor 130 is connected to one of the last lines or the base electrode of transistor 127, which is connected to I ⁺ via a resistor 129. The collector resistor 129 of transistor 130 Is therefore for the transistor 127 and the transistor 130 dereel-

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The transistor 130 is powered by the AC voltage from the power line 1 TO and, when saturated, becomes conductive very shortly after the zero point of the alternating voltage has been exceeded in the direction of that particular negative half-wave at which the silicone-controlled rectifier 111 is non-conductive. How this works The circuit is best seen in Pig · 2a.

The upper part of the Pig · 2a shows the AC voltage curve »which is effective at the main electrode of the rectifier 111» while the lower part shows the resulting output voltage which occurs at the collector and emitter electrodes of the J) transistor 130 · As already stated, The fast icon-controlled rectifier 111 is only conductive during the positive half-waves, while the transistor 130 is conductive during the negative half-wave enperioden of the voltage source.While the transistor 130 is conductive at saturation, the ground potential is at its collector electrode, and the same Potential is fed to the electrode of the Traneistore 127, which is connected to the resistor 129. The control electrode of the transistor 127 also essentially has ground potential The conductive transistor 130 therefore short-circuits the transistor 127, and its control electrode is limited to approximately the common potential of the main electrodes, which is the ground potential, so that the capacitor 125 cannot be charged .

Essentially at the beginning of each positive half cycle of Speiseweohselspannung transistor 130 ceases to conduct, ii) <i η ". · .. B ⁺ Sr ^ nn n.rjurif the electrode of the transistor 127

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can take effect, to which the resistor 129 is connected. The voltage across the capacitor 125 is now exclusively available under the influence of transistor 124. At the time in which

to transistor 127 for the first time (in a Weohselstrom period) a positive bias is applied, the capacitor is still essentially discharged, so that transistor 127 does not ignite but remains non-conductive.

The capacitor 125 is charged as a function of the DC voltage that is applied to the base electrode of the transistor 124 via the conductor 123 · sooner or later the ignition voltage for the transistor 127 is reached, whereby this becomes conductive% · the current flowing through the transistor 127 generates a steep voltage pulse in the secondary winding 122, the silicone-controlled rectifier 111 being ignited. The rectifier remains conductive for the remaining part of this particular positive half-cycle. In the meantime, the capacitor 125 has discharged via the conductive transistor 127 and remains discharged during the same remaining part of the positive half-cycle of the alternating voltage. During the following negative half-cycle, transistor 130 becomes conductive again, and the voltage across capacitor λ 125 is limited to ground potential.

From this it can be seen that the special DC voltage on the command line 123 is converted into a particular speed in the charging of the capacitor 125. That extent can also be interpreted as the slope of a sawtooth function. The gradual increase begins at point zero, where the supply voltage exceeds this point, which represents the beginning of a positive half-wave. The voltage across capacitor 125 increases in to the extent that the signal on conductor 123 is detected

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If a special ignition level is reached, transistor 127 ignites » wherein the ignition pulse for the silicone-controlled rectifier 111 is generated. The high voltage signal on conductor 123 becomes therefore translated into a special phase angle which begins with every positive half-wave of the supply voltage for the motor 100. This phase angle in turn determines the strength of the direct current that is introduced into the motor circuit. that the DC voltage signal on conductor 123 determines the extent to which motor 100 is braked, so that ultimately a certain speed regulation is carried out for the belt 20 · Now the generation of this signal on the Head 123 described.

During recording and playback, the signal on conductor 123 is derived from a differentiator amplifier 140, which has two input terminals, one terminal of which is grounded and the other terminal is connected to a network 141 consisting of a number of resistors, one of three potentiometers is switched between the operating loop 22 and the second input of the differential amplifier 140 · The input signal for the trimmer network 141 depends somewhat on the belt speed and on the resulting input frequencies · The network 141 changes the amplitude, with the same range for the engine speed is obtained regardless of the speed difference as a result of the speed settings by the change gear 29 (? ig «i). Since the actual "burden is different for the different speeds that are selected by the transmission 29, the uninfluenced by Hetzwerk 141 3teu" raignalbereloh · and the required control for a deviation gegeben® something won soft side down, even if

G09834 / Q633

BATH ORIGINAL

IJ b ζ A 1 U the motor 100 always g ^ ateuert in 'direction to the same speed

The differential amplifier HO is connected to a voltage source and contains a circuit, fc> düoa, if both inputs are the same (earth potential), a special, e.g. positive signal is fed to ^{the output conductor 1 23 v: i.rd *} If the input of the Dif ferentiaj.ver · ': & rk «r« HO, which is not permanently earthed, becomes negative, the output signal on the conductor' - · '.' üo ^v iWäch? r _for ^{and if a pc: ;:} active signal occurs at the non-earthed input of the amplifier, the output signal becomes stronger on the conductor

As already stated, during the recording a voltage source, designated 24 in Mg »1, is connected with a constant voltage to the control circuit in order to determine the motor speed and the tape speed in an open control rail. In the present particular embodiment, the voltage source 24 consists of the ground, which is connected directly to the second input of the differential amplifier HO during the recording. Since there is no further operating potential, and since the trimmer network 141 works with the grounding as the reference potential, the hacking network 141 is actually made ineffective. Since the amplifier 140 receives like inputs, the particular signal generated for this pail is routed to the conductor 123, and the motor 100 is braked in a certain, constant manner. In the engine, however, variations occur as a result of Spannunge- and / or frequency variations of the voltage source, d "height of the power line 110 · The rotational speed of the engine will therefore be affected in an open loop, and in a special way, i.e.," h _e by a particular signal on the ladder 1?% dan irr

0 U 9 8? L i Γ) Β 3 9

ORIGINAL

corresponds to the assumed time shift.

As already stated in the description of the function of the reference signal transfer carrier 26, takes place during the recording a signal recording in the control lane. This particular signal does not affect the motor control circuit at this time; however, the reference signal source is in operation when recording because it generates the signal to be recorded as a reference signal. In addition, the same signal source is used as the reference means for the reproduced reference signals are used, so that the circuit generating the reference signal must be described. Below will therefore a first embodiment for the reference signal source 25 is described in Pig.1.

A voltage source 150 with voltage regulation is connected to the network via a transformer and has a rectifier and voltage regulation stages so that, for example, B + and B- voltages can be generated that can be used in the circuit as DC supply voltages. «This voltage source 150 operates an oscillator, eg · the crystal oscillator 151 · Instead of this oscillator, the reference oscillator to be described according to FIG. 3 can also be used. The oscillator 151 generates a sinusoidal output with a frequency of 15.360 Hz, for example. The sine wave of this frequency is passed to a pulse shaper 152, for example a Schmitt trigger circuit, which generates square waves of alternating polarity as the desired wave. Two flip-flop positions 153 and 154 connected in series reduce the frequency of the pulses generated by the Schmitt trigger circuit 152 by a ratio of 4-1, ie from 15.360 He to 3.840 Hz.

Since the tape device described is assumed to have three tape 009834/0638

speeds, three different frequency sequences are required. The first frequency sequence is derived in the following way is connected, the flip-flop circuit 156 possibly continuously generating a signal with 1/16 the frequency of the oscillator, which is 960 Hz _o If a connection switch is switched, the 960 Hz signal is used, which frequency is the is the highest output frequency of the reference signal source and corresponds to the highest tape speed. ^ i

The other two frequencies are generated in the following manner. There is a monovibrator 157 is provided, the

Input side triggered by the output of the flip-flop circuit 154 is, whereby a frequency division takes place in the ratio 1O.

The monovibrator 157 is therefore triggered by a first output pulse from the flip-flop circuit 154 and remains in the unstable operating state during the next two pulses from the flip-flop circuit 154, then returns to the stable operating state and is flipped off by the following pulse -flop circuit 154 triggered again, etc. * The frequency of the output pulses ™ of the monovibrator 157 is therefore 1.28 kHz. If another selector switch 161 is in the setting shown, the output of the monovibrator 157 is routed to a flip-flop circuit 156, which causes a frequency division in the ratio of 2% 1, so that "the output from a square wave sequence with a frequency of 640 Hs exists, which takes effect when the operating supervisor 160 is also in the setting shown. » The representation shows the circuit in a switching state f-χν this «wide intermediate reference frequency.

009834/0639

ORIGINAL

If the switch 161 is switched over, but the switch 160 is left in the existing position, the output of the monovibrator 157 is fed to a flip-flop circuit 159, which in the present case ^{controls the flip-flop circuit 1} 158 so that for In this case, the output of the last-mentioned circuit has the lowest reference frequency of 320 Hz »There are therefore three wave sequences with 320, 640 and 960 Hz available, the frequencies of which are 1t2t3 to each other«

During the recording, the operating switch connects 32 (Fig. 1) the output of the selector switch 160 with the reference signal, transmitter 26, as already described, so that depending on the setting the selector switches 160 and 161 a certain waveform is recorded as a reference signal «3s it is assumed that the Motor speed with the help of the gearbox also in relation 1s2i3 can be set »For each of the three possible Revolutions and speeds are indicated in the reference apur. The particular reference signal drawn always records the same wavelength regardless of the choice "

For the description of the method of operation when reproducing the recordings that follows, we would like to remind you that the motor speed and thus the belt speed are indirectly influenced by the output generated by the differential amplifier HO} in order to generate a special braking torque. When the amplifier HO is set up so that it responds to the tape speed and position "as nooh will be described" for playback, the operating container 32 is switched over, with the beauge track transmitter 26 being disconnected from the signal source and instead connected to a pulse shaper 170 which the end

008834/0633

BAD ORIGINAL ^C0PY

a Schmitt trigger circuit "consists of a sequence of square waves generated from the sinusoidal signal generated by the transmitter 26 when reading the reference track. The one that takes place at the same time Reproduction of the facsimile data has already been described.

The output of the Schmitt trigger circuit is passed to a differentiating circuit 171 which, corresponding to the leading and trailing edges of the signal sequence generated by the Schmitt trigger circuit 170, generates a number of peaks equidistant from one another. These tips have an alternating polarity, and only one specific polarity is used to put a DC flip-flop circuit 172 into one operating state. The input side of this circuit 172 intended for the other operating state is connected to the reference pulse source 25 is controlled, d »h _e the forwarded by the selector 160 of the other signal is differentiated and sets the flip-flop circuit in the other operation" state.

It is recalled that recording and playback can take place at different tape speeds, but that the signals in the reference track on the tape have the same wavelength offsetting pulses is therefore proportional to the tape speed and can deviate from the frequency of the reference signals if they were recorded during recording · On the other hand, the frequency of the direct reference signals, which now act as control pulses · that the flip-flop circuit in the set another operating mode, so set »that it entiprioht the tape speed during playback * Assuming the

009834/0839

COPY

Tape speed during recording is 9 »· 5 cm / sec, see above the reference signal had a frequency of 320 Hz. When playing the tape speed can now be 28.5 cm / sec, so that the reproduced reference signals are three times the frequency , i.e. * 960 Hz. Accordingly, the frequency of the direct Reference signal for playback can also be set to 960 Hz (toggle switch 160) · The flip-flop circuit 172 is therefore of the reproduced reference signals into one operating state and from the direct reference signals put into the other operating state

For correct facsimile reproduction, the phase relationship of the various facsimile signal parts to one another must be maintained at all times during reproduction.A frequency deviation of the two signals from one another, which corresponds to a frequency phase deviation and therefore takes a relatively long time in each direction, leads to a completely distorted facsimile duplicate. Low-frequency phase deviations lead to jittery and distorted image lines «The phase between the reproduced and the direct reference signals must therefore be kept constant.

It can be seen from this that the flip-flop circuit 172 is actually the first part of a phase detector which determines the phase difference between the reproduced and the direct reference signals. The time period in which the flip-flop circuit 172 remains in one operating state therefore indicates the phase angle between the wave trains which cause the shift to one or the other operating state. The frequency of the output wave train generated, for example, on the output side of the flip-flop circuit 172 assigned to the one operating state

009834/0639

copy

is of course, on average, the same as the frequency of one of the Input signals ο It is to be expected that frequency deviations of the reproduced reference signals occur only briefly and only act as brief phase changes. At the company in a closed loop, the device is used to maintain a desired specific phase relationship between the reproduced and the direct reference signals, so that the periods of one and the other operating states of the Flip-flop 172 remain constant. In particular, should these be equal to each other "

The flip-flop 172 contained in the feedback loop now describing ζ u actuates a switch 175 which, in one operating state of the flip-flop circuit, ^{connects an output conductor 176 to the positive pole B + of} the voltage source, while the switch 175 in the Another operating state of the flip-flop circuit 172 connects the output conductor 176 to the negative pole B "of the voltage source. B ⁺ and B ~ have the same but opposite values with respect to earth. This is only necessary because flip-flop circuits "generally work between a certain voltage level and earth" The signal appearing on conductor 176 consists of a train of waves that oscillates around the earth the proper PhaBe the positive and negative signals are equal to each other. With proper relationships between the reproduced and direct reference signals, the signal on conductor 176 has an average value of zero.A phase deviation is indicated by a positive or negative direct current signal on conductor 176, ke after,

00383 ^ / 0639

COPY

whether the reproduced reference algnals in relation to the direct Reference signals appear a little too early or a little too late

To generate this pass-through signal is on the line 176 an active low-pass filter 177 is connected, which has a rolling characteristic and ζ · Β · at a frequency of approximately 20 Hz corresponding to the expected maximum frequency of the band. The filter 177 therefore removes the frequency of the reference signal, which is generated in one of the stages described above and can be 320, 64-0 and 960 Hz · The filter naturally removes also the higher harmonics in those from the flip-flop circuit 172 generated square waves, so the output of the active Low-pass filter 177 has a very low frequency or consists of a Glelohstromsaignal that represents a variable or constant phase deviation in the tape drive. The output of the active low-pass filter 177 is therefore a real deviation signal.

This rejection signal is fed to the leading / negative healing network 178, which has a frequency selection characteristic, namely the agitation causes an increasing signal attenuation when the frequency of the negative signal changes from approximately zero to 3 Hz (negative healing part), but one again weaker damping at higher frequencies (leading part) A constant or very slowly changing phase deviation signal is therefore rated as a fairly large deviation, while the same phase deviation signal amplitudes are more attenuated when they change to a greater extent · Herewith a too hasty reaction of the loop is to be prevented, which explains why the nao-healing part of the network ewI-sohen 0 and about 3Hs becomes effective and the rejection signal with increasing frequency within this range attenuates.

009834/0639

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The relative gain of the amplitude output with increasing Frequency in the range between 3 Hz or 20 Hz taken into account, the rolling away of the response characteristics of the motor 100 for higher frequencies. The engine responds less and less to brake signals higher frequency at · Therefore, the amplitude of the deviation signal are increased, resulting in the division part of the characteristic of the network 178 explained

During playback, the switch 22 connects the network 178 to the speed selector trimmer network 141 already described, which effects a speed-dependent setting of the particular signal level Motor 100 is not directly influenced by the speed selection On the other hand, the load on the motor changes with the different belt speeds, so that the response of the motor to a certain control signal is different at different belt speeds, even if the motor speed is the same at all belt speeds The trimmer network therefore causes an adjustment of the loop gain · This is necessary to gün- like stigste strengthening of Systemechleife for each speed as a result of the change in the calibration Anspraohefähigkeit rotating components in the various To effect operating speeds, and to compensate for the differences in the phase constant (yolt / rad.) Of the phase detector direction for different operating frequencies «

The circuit to which the output of the network 141 is fed has been described ready for recording, and the operation in tateädhlioh the same · The differential amplifier

009834/0639

amplifies the deviation signal independently of the method for controlling the generation of a special ignition pulse for the silicone-controlled rectifier 111 in the manner described above. During the recording, the phase of this ignition pulse was constant! however, when reproduced, it changes according to the deviation signal. In either case, there is a considerable gain between the deviation signal on the output side of the filter 177 or the control signal _a n on the output side of the differential amplifier HO and the DC component in the AC supply for the motor 100, so that the motor reacts quickly, even with small phase deviations and the tape hold positions in the desired progression

Fig. 3 shows in a somewhat schematic representation a simplified modification of the one generating the deviation signal and treating circuit · i> the motor control circuit substantially the same as that shown in Figure 2, and comprises the modification primarily the generation of the direct current signal for the conductor 123 »which determines the degree of charge of the capacitor 125, which in turn determines the timing of the ignition angle for the silicone-controlled rectifier. In this embodiment the base electrode of the transistor 124 receives a direct voltage via a potentiometer 180 during the recording whose help a certain braking angle during the recording can be set · For playback, the operating controller 22 * is switched over, with a signal being fed to the conductor 123 generated in the manner described below

In the same way and for the same purposes as before, of course, the reference signal transmitter 26 is provided and generates a Sine wave output supplied to a pulse shaper 181

009834/0639

BATH ORIGINAL

which in turn generates Reohteck pulses on the output side, which are used to ignite transistor 182. The two base electrodes of transistor 182 are connected between B ⁺ and earth. One base electrode of this transistor 182 is capacitively connected to the control electrode of a silicone-controlled rectifier 183. This rectifier 183 is therefore ignited synchronously with the pulses derived from the pulse shaper 181. The anode of a diode 184 is connected to the other base electrode of transistor 182, while the cathode of diode 184 is connected to the collector electrode of a transistor 185, the emitter electrode of which is grounded _e %

The transistor 182 remains conductive as long as the diode 184 is reverse biased via the transistor 185 when it is non-conductive The transistor 185 receives a control signal for the duration of a pulse-shaped reference signal which is derived from the reference signal source 25 This reference signal source can be an oscillator with a chain of binary reduction stages, as described in connection with Pig «2. However, this embodiment is used to represent a slightly different reference signal source, which in turn can be used in the device according to the λ Pig; 2. In particular, such a reference source is selected when the associated facsimile unit in sync with the örtliohen Ifetzleitung worked the Hetzleitungssignal becomes a · Since a phase detector 251 passed which operates a spannungegeregelten oscillator 252nd The output of this oscillator is then treated by a circuit similar to the circuit connected to the oscillator 151. The box 253 can therefore contain the elements 153 to 160 in FIG. This circuit then has three possible outputs, and the choice

009834/0639

an output is from the speed selector 30, e.g. from the Switches 160 and 161 in Figo2 determines “The relevant output of the circuit represented by box 253 is used as Reference signal to control transistor 185 · The lowest frequency of the output is still higher than 60 Hz and enables a greater accuracy in the speed regulation of the motor, so that the circuit of the box 253 contains further frequency reduction stages, the output of which is then fed to the other side of the phase detector 251, so that the oscillator 252 of the phase naoh is synchronized with the Hetzleitung · That from the unit 253 derived reference signal therefore consists of square-wave pulses, which have a certain phase relationship to the network line.

The transistor 185 is switched to the conductive state at ζ · Β · positive reference input pulses both diodes become conductive · The base electrode of transistor 182, to which the anode of rectifier 184 is connected » is grounded when elements 184 and 185 conduct, whereupon transistor 182 stops conducting. In addition, the anode of the silicon-controlled rectifier 183 is essentially the Brdpotential so that the rectifier stops conducting ·. ·

From this it can be deduced that the duration of the leading term of the silicone-coated sliding earther 183 is a measure of that The phase difference between the suggested impulse trains is on the one hand, which are connected to the transmitter element of the transistor 182 as well as to the base element of the regular transistor 185. Dtr rtsultitrtndt pulse train is generated from the anode of the siliconized Qlelohriohttrs 183 derived and duroh an integrator or a low pass filter

009834/0639 ¹⁸⁶

conducted, whereby a direct current signal is generated, which in turn is fed to conductor 123 for the purposes described above.

This simplified version of the one shown in Pig «3 The control circuit can still be improved a little to increase the gain of the device and to increase the signal the conductor 123 to remove the ripple. It should be noted that that in the circuit according to the £ ig «2 there is such a ripple is not available, while the gain was sufficient As shown in the figure *, the output of the phase detector, that is, the anode of the silicon controlled rectifier 183, as before are connected to an integrator 186, which in turn feeds one side of the differential amplifier 190. The other side of the differential amplifier 190 receives an adjustable, however constant signal from a resistor network 191 * The differential amplifier 190 therefore amplifies the direct current signal, generated by the integrator low-pair filter stage 186 and forwards the signal to the operating switch 22 *, the Base electrode of transistor 124 is controlled as previously described. It is now desirable to provide an additional feedback network that includes a capacitor 192 that incorporates the The collector potential of the transistor 124 is fed back to the second input of the differential amplifier 190 in order to reduce the DC voltage remove any ripple so that the sawtooth voltage generated across the capacitor is fairly evenly sloped and is ripple-free, the ignition timing and the Firing angle for the silicone-controlled rectifier 11, which is determined by the capacitor 125, is precisely defined.

The jig. 5 shows an iaksimile transmission system according to 009834/0639

BATH ORIGINAL

of the invention, with the station in the upper half of the drawing A and in the lower half the station B is shown, which two stations are removed from each other and connected to each other are by a two-way connection via a land line, a radio transmission line or the like, as generally by the line C shown. Any facility that is suitable for the transmission of facsimile qualifications comes into consideration here. · You Invention does not depend on a particular type of transmission equipment.

With the system shown, the image of a document is to be transferred from station A to station B and reproduced there. In the Pig · 5 is therefore the essential of the system shown for a one-way connection · A two-way connection therefore requires that all circuit elements shown for station A are also provided for station B. and vice versa.

It is assumed that two connections must be provided, with each station basically four modes of operation has the transmission / recording mode, in which a germ signal is generated and recorded, the transmission / playback mode, in which a recorded facsimile signal is reproduced and is transmitted via line 0. These two modes of operation are described for station A. The next two Modes of operation are described for the station B and consist of the reception-recording operation, where one paksimilt information is received and recorded, and the reception playback operation, where the recorded facsimile signal is reproduced and to « Assembling an image is used

The station A has a facsimile transmission A1 which 009834/0639

may consist of a conventional design and an image into an electrical signal is converted, which is generated in a line by line scanning of * the facsimile sender A1 from a local power source and operated in synchronism with this, z _e example from the position denoted by 10 heating. In the facsimile transmitter, the document to be reproduced is scanned line by line by a focused beam. The light beam is reflected, with at least part of the reflected light being intensity-modulated according to the contrast of the document. The photodetector or photodetector responsive to this light generates a correspondingly changing output signal. ™

Facsimile transmitters do not consist of a uniform version however, they generate the "paksimile information in the form of AM or FM signals in the range of tom frequencies. Of the Unit A1, an output signal of this type is now generated and passed to a recording circuit A2, in which an additional Gain and impedance matching can take place, so that the output signal from the circuit network A2 operate a transformer can·

Ss is an operation switch A3 is provided which is set after the display on the transmitting Λ-Aufzeichnungsbetriebsweiae. Dieeer operation switch A3 connects the output of the circuit A2 with a data transmitter A4, the Jfakeimileeignals be recorded cooperates with a magnetic tape A3 and produces thereon a Datenepur, wherein the sow as faithfully · representation dee * connects at the transmission playback Betriebsweiae the Companies A3 keep the transmitter A4 with a playback management network A6 · In this mode of operation, the transmitter A4 works as a metering or playback transmitter and generates an output

009834/0639

signal that represents the previously recorded data and is used for Reproduction hold 16 containing appropriate gain stages and equalization networks, with an output signal is generated, with which a signal transmitter A7 can be operated. This signal transmitter A7 is connected to the line C, where the facsimile signal e.g. via telephone or telex lines or transmitted through other facilities which are generally used for such purposes

From this it can be seen that the paksimile transmitter A1 is not directly connected to the transmitter A7, but that a recording medium A5 is interposed on which the signal to be transmitted is first recorded and then transmitted later.In this way, the paksimile scanning method is different from the actual transmission measured independently in various respects, for example from the time of scanning and the time of transmission, so that a time can be selected which is the most suitable with regard to the other work processes.

During the transmit-record mode of operation of station A, facsimile data is generated in line synchronism and then recorded on tape A3 by transmitter A4 on a specific track. This signal has fluctuations that are tine due to fluctuations in the frequency of the current source 210. If all "subsequent treatment devices la of the entire system were to work directly under the influence of these fluctuations", no action would have to be taken to suppress the fluctuations. You · we · However, a mistaken assumption ·. Ba is therefore required because the pair of the aeileaeynehroa ^ n Abtattvif uad the signal generation durtn the lakaimlleeeader At f _;: \ _;

009834/0639

• ORIGINAL BATHROOM

second transmitter A8 in a parallel to the data track Track recorded. This reference signal is made in the following manner generated·

With the. Operating mode holder A9 can cause the transmitter A8 to operate either as a recording transmitter or as a playback transmitter. The operating switch A9 is connected mechanically or in some other way to the operating switch A3, so that both switches are set at the same time. At this point, the transmission / recording mode is described, in which the switch A9 is in the setting shown and an electronic recording network A1O binds to the transmitter A8 comparable%. In the transmit / record mode of operation, a third operating switch A2O is in the setting shown, so that the signal handled by the electronic recording network A10 is derived from a network A11 which contains circuit elements with which a suitable recordable reference signal is derived from the power line 210 can be.

The power line, for example, 210 generates a 60-Hz signal whose frequency is preferably doubled, for example, by means of a two-way rectifier and a transformer transmission, so that _M is a 120-Hz signal occurs in a channel 12, which naturally has a certain phase relationship with the line voltage particularly For the operation of the facsimile transmitter A1 · A voltage-controlled oscillator 213 is also provided in the network A11, which, for example, generates a mono-shaped signal with a frequency of 3.84 kHz. The oscillator can also consist of a voltage-controlled multivibrator or the like

The output of the oscillator 0 213 becomes a pulse shaper 214 »ζ · Β · to a Schmitt trigger circuit and

009834/0639

BATH ORIGINAL

then subjected to a frequency division by several binary stages 215, the z »B. can consist of two flip-flop circuits connected in series. The binary stages cause a frequency division in the ratio 1i4, so that the output has a frequency of 960 Hz Ratio 1: 8 causes the output of the binary stages to consist of a signal with a frequency of 120 Hz

The output from the binary stages 21b becomes a phase detector 217, which at the same time receives the 120 Hz signal derived from the power line 210 from the channel. The phase detector 217 generates an output signal consisting of a direct current signal and the value of which is the phase difference between the two signals applied to the inputs. This DC signal from the phase detector 217 is used for setting and controlling the oscillator 13 is used. With the help of a closed loop, the derived from the binary levels 215 has 9bO Hz signal has a fixed phase relationship to the local AC power source 210 on

The operating switch A20 connects the output conductor 218 of the network A11 to the input of the electronic recording device A10.This phase-regulated 960 Hz signal is processed in the electronic recording device A10 and, under suitable impedance conditions, assumes a suitable power level, so that the output signal of the electronic recording device AtO may operate the transformer A8, which accordingly, the 960 Hz signal on the tape A5 zeiohnet as Besugsspur on. That this signal also goes to a phase detector A30

$ 008634/063

is conducted, has no consequences, since this phase detector A3O at the execution of a recording by the manager A23 except Operation is set to be described later.

From this it can be seen that in the transmit / record mode of operation the line-synchronous reference signal on the tape in a certain spatial relationship to the one recorded at the same time line synchronously generated data signal is recorded o The recorded Reference signal therefore represents the phase and frequency fluctuations experienced by facsimile scanning and signal generation as a result of such fluctuations in the mains current, »Should the belt speed also increase during the ™ If you change the recording, these changes appear as changes in the wavelengths of the data and the reference signal that is on the Tape is recorded; however, the phase relationship remains between the data and reference signals unaffected by these fluctuations in tape speed

The belt A5 is driven by a drive motor, which is generally referred to as the belt drive unit A21 »The drive motor can consist of any suitable design! however, it is an induction motor ζ · Β. a capacitor motor preferable · ä The existing out of the tape loading of the engine may have a value at which the motor without further action transports the tape at a rate which exceeds the desired speed. To regulate the motor, a braking force is exerted on it as a simulated overload, for which purpose, in addition to the operating alternating current, a signal is fed to the motor. If such an induction motor supplied to a fixed DC voltage, the motor is braked as "Jedooh runs at a constant speed

00983A / 0639

BATH ORIGINAL

provided that the frequency of the operating alternating current also remains constant. The speed of such an induction motor can be regulated by increasing or decreasing the braking force will"

The level of the DC voltage supplied to the motor for the purpose of braking is determined by a brake control unit A22 the figures 1, 2 etc. described

During recording, the unit A22 receives over the operation holder A23 a constant signal so that the tape is driven at a constant speed. The operating switch A23 can be mechanically operated with the operating brackets A9 and A3 or otherwise connected. Incidentally, the tape drive is not regulated during recording. The belt speed is only constant to the extent that the inertia of the belt drive eliminates temporary fluctuations in the mains frequency. A flutter of the belt is not eliminated.

In the case of the transmission recording mode of operation, a Jakeimile image is scanned synchronously with the network frequency, and te is scanned a corresponding signal is generated and on the tape at the same time. a reference signal, which is also derived from the line. The tape is moved forward by a motor, which is operated at a constant speed but in an open Bohltifa, i.e. without feedback control.

During the Bende-AufBeiohnunge-Betriebewei ·· wtrdta dit dit representing image information as well as dlt reference suitable tob Volume A5 read, DIt playback of the data «ad dlt forwarding -

009834/0131

t

BATH ORIGINAL

for the transmission channel C has already been described · The handling of the reproduced reference signal and the regulation of the tape drive as a function of the reference signal is shown in the following described way »

In the transmit-playback mode of operation, a voltage source A25 at a normal frequency is used to regulate the tape movement. This unit A25 contains an oscillator, for example an oscillator 226 with a piezoelectric crystal, which is operated by a constant direct voltage and has a frequency of 15.36 kHz, for example. A Schmitt trigger circuit 227 converts the sinusoidal output of the oscillator 226 into a square wave signal. Several flip-flops connected downstream form a frequency divider stage 228 which divides the oscillator output in binary form. The binary stage 228 can consist of four subsequent DC flip-flops, which cause a frequency division in the ratio 1t16. The output of stage 228 has a frequency of 960 Hz and represents the output signal of binary ^A 25.

As in the transmit / playback mode of operation, the switch A20 is switched over, this 960 Hz output signal becomes the Unit 25 passed to one of the two input terminals of a phase detector A3O. It is carried away that the simultaneous forwarding of this signal to unit A10 has no consequences, since during playback the switch A9 separates the unit A1O from the transformer AB. The second input for the airport detector A30 consists of the signals that are read by the transmitter AB from the reference track with this other setting of the operating switch A9. The output signal of the transmitter A8 is first treated in an electronic display network A31, wherein

009834/0639

an output signal is generated which represents the signal read from the reference track and which is fed to the second input of the phase detector A3O

The phase detector A30 generates a DC output signal that shows the phase relationship between the crystal controlled Represents the reference signal from the unit A25 and the reference signal read from the tape, and that characteristically represents the line frequency when recording on the tape during the transmit-record mode. The DC output signal of the phase end detector A3O therefore contains all deviations and in particular all phase and frequency deviations that occur during the generation of the facsimile signal, its recording and playback appeared.

In the transmit / playback mode of operation, the operating switch A23 is also switched over, so that the output of the Phase detector A3O is fed to the motor control circuit A22, the motor A21 being decelerated in accordance with the changes in the output of the phase detector A3O. The belt speed is therefore regulated in the direction of a certain constant phase e.g. between the reference signal from the unit A25 and the reproduced line frequency

It should not be said that the regulation of belt movement in rotation is at a constant speed, since constant belt speed is not the ultimate goal at this time. The ultimate goal is a constant phase of the reproduced data and, in particular, a constant line repetition frequency, ie a constant scanning frequency that is suitable for Jaksimile. This takes place automatically when the reproduction of the reference signals for a signal old one _s

009834/0639

BATH ORIGINAL

constant frequency, which duroh regulating the belt speed all deviations in the reference signal, the ZeB. a consequence of an irregular scanning speed, irregular tape speed during recording and now during playback should be controlled and eliminate the purpose for which the belt speed can be intentionally changed «,

The tape speed is regulated so that the facsimile scanning signal now appearing in the circuit Ab-A7 is in sync with the constant frequency reference signal received from the unit A25 and in the present Trap is generated by the oscillator 226, regardless of the irregularities, the generation of the facsimile signal in transmitter A1, occur when the signal is recorded on the tape and / or when it is played back later. After that, this is routed to transmitter A7 reproduced facsimile signal essentially independently from the local network · This shows that the accuracy of the data signals routed into channel 0 depends primarily on the Constancy of the frequency of the crystal oscillator 226 depends.

If the facsimile signal consists of a frequency-modulated signal, a conductor can be used for further fine adjustment A32 between the output signal of the reference track transmitter or better between the treatment center A31 and the data playback scarf device A36 can be provided, which is in the period of the reproduction process a · deceleration that changes with the speed introduces «The in-regulation achieved in this way will be described later.

In the following, the reception / recording and the receive-playback operations described at

009334/0639

each station can be performed, are described only with respect to the station B * The elements in the station B, corresponding to the elements already described for the station A directly, are the same COVERS numerals, but provided with a prefixed ^N B ^N . The elements described for the first time in the following section, which relate in particular to the receiving mode, are also available in station A if they are working in the two receiving modes.

The station B has a signal receiver B33, the is connected in some way to the transmission line C and receives the signals sent out by the station A which are im present Palle are sent out by the signal transmitter A7. Of the The signal receiver B33 is connected to the recording circuit B2, which converts the signal from the receiver B33 into a signal that can operate the transmitter B4. The operating mode of operation connects the B3 recorder Output of circuit B2 with data transmitter B4 of station B. In this mode of operation, the transmitter B8 also records a reference track to be recorded reference signal derived from the unit B25, the contains the same elements as the unit A25. The operating switch B20 is in the setting shown and performs this 960 Hz signal from the B25 electronic recording unit circuit B10, which generates a signal at a power and an impedance level that is suitable for recording through the auxiliary transmitter ΒΘ. The simultaneous forwarding of the same signal to the phase detector B30 has no effect because the operating controller B23 prevents this due to its setting. The tape drive unit B21 is controlled by the brake control unit B22 in the

009834/0639

Recording is controlled in the same way regardless of whether the station is in the transmit or receive mode Switch B23 supplies a constant direct current signal to the brake control unit B22, with the tape drive in an open loop and works with constant speed control, as already described

In this case, too, the speed of the belt B5 can fluctuate somewhat; however, the data recorded by the transmitter B4 is accompanied by a reference signal which is ultimately derived by the crystal in the unit B25, so that a certain phase relationship between the two signals is restored on the tape the reception / recording mode of operation in station B corresponds to the transmission / playback mode of operation in station A. It is also assumed that the two oscillators in the two stations are so precisely constant that they can be viewed as working synchronously It is most important from the outset that there is a fixed - relationship between the reference frequency generated by the crystal unit A25 in station A during the playback-transmission mode in which the signals are routed to line C and the crystal reference unit B25 in the station B in the record-receive mode, during which these signals from the channel C are recorded on the tape B5 together with the reference signal from the unit B25.

The Xmpfange playback mode of operation remains unchanged describe, while the iakaimile-Bmpfänger B34 a figure

009834/0639

generated by combining the signals read from tape B5 · For this mode of operation, switches B2, B20 and B23 as well as B9 and are in the opposite position to the Sar position. As far as the reproduction of seeds acts, the data transmitter B4 conducts its output signals via the Betriebsohalter B2 to the reproduction circuit B6, whose output signals to the facsimile receiver B24 for assembling the image be directed. It is assumed that the receiver B24 is connected to the local network consisting of the AC power source 100, which may not be phase related to the power lines 10 at the location of station A. The frequencies can actually also be different.

You tape movement is described in the following Way regulated. The braking circuit B22 receives a track current signal from the phase detector B30 like the motor control circuit in the playback mode of station A, as described above. This is done accordingly by the transmitter ΒΘ from the reference track The read signal is passed via the operating switch B9 to the electronic playback circuit BJ1, which produces a suitable power and impedance level and an output signal to one side of the phase detector B30 conducts. The other side of the phase detector B30 receives a reference signal from the unit B11 via the switched operation switch B20. Unit B11 is the same as above described unit A11 and generates a 960 Hz reference signal, which has the same phase as the Netzfreqnenz. Sas phase signal from the unit B30 represents the possible variable phase deviations between the reproduced reference signal and the network-frequency signal

009834/0639

BATH ORIGINAL

and especially in the case of the speed regulation for the belt B5, a certain phase relationship between the image composition process and the speed at which the data signals are read from the tape by regulating the tape drive with regard to the phase of the power line that the conventionally required chaining of the power lines at the sending and receiving station is not necessary «

In the different operating modes of a single station, the operating switches B2, BO and B23 (or A2, A9 and A23) are in settings that are determined exclusively by the desired mode of operation of the tape unit concerned, i.e. the M setting of these operating switches determines recording or playback regardless of whether the facsimile unit is set to transmit or receive. However, the operation eo holder B20 (or A20) is in the same setting in the transmission recording mode and in the reception reproducing mode, and so holds the reference unit B11 (or A11) in the System, while with the opposite setting this operating mode holder is provided for both operating modes for which the crystal reference unit B25 (or A25) is used. In addition, a set of operating switches is of course required in order to be able to distinguish only between sending and receiving. These additional operating brackets are not shown, but their presence follows logically from the description above.

The data record keeping A2 (B2) is either with the Jtekeimileeender (transmission mode) or with the signal receiver connected to the transmission line 0 (lapfangebetritbeart). The playback circuit A6 or B6 is either connected to the signal end or to the facsimile receiver. The attachment described here can be modified in various ways

0 0 9 8 3 A / 0 6 3 9

and, among other things, special recording and playback transmitters can be provided, or a single transmitter can be used (or ζ white recording and playback transformers) can be used for recording in a single track ·

The method and apparatus are close to the invention essentially independent of the design of the paksimile unit used, with the recording / playback device at each Station allows the establishment of a connection between facsimile devices that otherwise cannot be used together. This The principle can be improved if the recording circuit (A2) contains its own modulator, which is connected to a Terminal in the facsimile transmitter is connected, with the baseband signal directly generated, which modulator part is only used in the 8-end recording mode

The playback bracket B6 can then contain a demodulator, which is only used for the reception and reproduction of the Betviebaart and directly operates the element in the facsimile receiver which is based on the facsimile baseband signal is responsive to the generation of the image. In those where the facsimile signal is slurred Facsimile transmitter in the form of an amplitude modulation using a carrier leaves »4 is derived from the Hetzleitung» the reference area can be completely removed, at least in the Station, if this works in the Bende operating mode, wobti in the case of the transmission / playback Bfttrlebaart the signal reproduced by the transmitter A4 is then additionally routed to the phase detector A3O, whose second input always receives no dl normal frequency from the unit A25. On the receiving side, 4 of the same kind can be used. be worked, with again the played signal in addition is used in the phase detector B30, the second input of which the

009834/0638 ^ _{0 0R1G1NAL}

Hormal frequency from the unit bit receives Xe now assume that that »frequency-modulates the facsimile data to be recorded are. In this lalle every 4 of the oscillators described above can be used Can be used as a carrier source if the frequency is high enough is·

The flt modulator can modulate fake data that is generated locally, or received from a remote transmitter Track receives a reference signal which can consist of the carrier frequency itself or which has a fixed numerical and phase relationship to this. Normally, the signals in one of the tracks come from the same oscillator, so the variable relationship between the data track and the reference track represents the relationship between the fM tape and the carrier.This relationship is maintained even if the tape speed changes during recording, e.g. result of tape flapping · The tape flapping simulates an additional modulation in the recorded signals. The reference signals to be recorded are ^{modulated exclusively by this "flutter 11"} , specifically in a manner that allows subsequent demodulation in order to control the elimination of this incorrect modulation from the data.

However, the same result can be obtained even if the fM modulator and the reference signal transmitter are signals receives from different oscillators, provided that these are in phase with one or individually so far be kept constant so that deviations are outside the range in question. This latter Pail leaves {it

00983A / 0639

BATH ORIGINAL

before when the data to be recorded originates in a remote facsimile station as ϊΜ-modulated signals, where the oscillators are necessarily different ο

The data recovery from the tape and the simultaneous control of the tape drive unit are now performed in the Playback described. In this case too, it is possible to use the data and reference signal transmitters used for recording for to use playback.

As can be seen from FIG. 6, after the frequency-modulated signal has been reproduced by a transmitter 332 on reproduction, it is first transmitted through an electronic signal Reproduction circuit 341 which may include suitable amplifiers, equalization networks, etc. to improve the signal-to-noise ratio. The output of this network 341 becomes routed to one of several limiters 342 in order to reduce the amplitude to eliminate problems in the frequency-modulated signal, since such amplitude fluctuations only represent noise and have to be suppressed. The output of the limiter (s) 342 becomes one Polyphase amplifier 343, which consists of a transistor whose collector and emitter electrodes have their outputs individually xu conduct a differentiator and a doubling stage 344, so that their output terminal 345 voltage pulse peaks 345 * with a Receives repetition frequency which is twice the frequency of the carrier, but which follow each other at a variable rate according to the frequency modulation.

The pulses 345 *, which still represent the frequency-modulated carrier, are fed to a monovibrator 346 for triggering. The monovibrator 346 naturally requires a supply voltage for operation, which in the present case is the monovibrator

009834/0639 ORIGINAL

~ 57 -

is fed via a second input channel 347 · The duration of the unstable period of the monovibrator 34-6 depends on the DC signal applied to the channel 347. This period is of course allowed never the shortest repetition period for the trigger pulses 345 'that would be expected. The back flank of each output pulse 346 * of the monovibrator 346 represents the actual outcome.

As long as the DC voltage in the Sreuerkanal 347 remains constant, this rear edge occurs with exactly the same variable speed as the frequency-modulated trigger pulses 345S and there is only a constant phase difference between the pulses 345 * and the rear edge of 346 * corresponding to the unstable period of the monovibrator 346, which remains constant with a constant direct current signal in the channel 347. These trailing edges of the pulses 346 ^r therefore contain the frequency modulation of the original data. If the voltage in the control channel 347 changes, this change is superimposed on the data as an additional modulation.With such a change, the trailing edge of these signals 346i ^f still contains the frequency modulation, but with a variable delay compared to the input signals 345 '

The trailing edges of these pulses 346 * become Triggering another monovibrator 348 used, which a constant Voltage is supplied so that its unstable period is constant * This monovibrator 348 generates a constant voltage-time integral for each output pulse, that for the next Treating the signals is useful. There is an operating switch 349 in the setting shown, the output signal will be of the monovibrator 348 to an FM signal demodulator 50

009834/0639

which can consist of an integrator and / or a low-pass filter and removes the carrier frequency, but has a pass-through area that exceeds the frequency range of the information (the Baseband) · The output of demodulator 350 is passed through amplifier 351 to one for further processing to generate a more suitable signal level · The output of the amplifier 351 is routed to channel 312 which routes the output directly to the facsimile receiving part 314 of a facsimile unit which prints out the facsimile information.

With the other division of the operating system 349, the output signal of the monovibrator 348 is routed to a flip-flop circuit 353, whereby this circuit is alternately set in one and the other operating state in accordance with the output pulses from the monovibrator 349 «The output of the Illp -flop-Sohaltung 353 corresponds to the originally recorded information signal, since it is also modulated according to the voltage fluctuations in channel 347 The output signals of the Jlip-flop circuit 353 are then passed into channel 322 and via its transmission device to the one at a remote location located facsimile · inhslt or dsrsn tape unit. Use dss signal path ·· 349-350-351-312 "3U ODSR of Bignalpfadss 349-353-322 to bathing facility depends rom ■ origin of the reproduced 8ignale off as described above.

The accuracy of the reproduction of this facsimile is suitable is controlled by the control described below · The Transmitter 333 reads the train track during playback The data from the transmitter 332 is reproduced from Sa, the target signal is passed to the electronic reproduction unit 361, which is connected to the network 341. The more or less slnua-

009834/0630

BAO ORIGINAL

shaped output of this circuit 361 then becomes a Pulse shaper 362, ζ · Β · passed to a Schmitt trigger circuit and converted to square pulses. Depending on the frequency selected for this reference signal, the output of the Schmitt trigger hold 362 passed through one or more binary stages 363, whereby square waves with a different, lower frequency are generated «

The output of these stages, or if the frequency allows, the output of the Schmitt trigger circuit 362 is fed directly to one input of a phase detector 364, the second input of which is the output signals of a reference oscillator 365 does not receive either directly or via binary treatment stages 366. Of the Reference oscillator 363 can be made from the Hetzleitung or from a crystal oscillator exist and the oscillator 336 resembles. The output of the phase detector 364 consists of a pulse train whose Frequency is the same as the frequency of the two inputs supplied, while the pulse duration of each pulse is equal to the phase deviation of the two input signals. The frequency of these signals is removed in a low pass filter or integrator 367, ao that the output channel 368 is a direct current signal, the amplitude of which the position deviations of the tape from the desired Represents position determined by reference oscillator 365 *

It can be seen from this that during playback operation the control signal in channel 368 represents the combined deviations in the tape speed and the tape position during recording and reproduction from the reference oscillator 365 at the time of data reproduction represents. It is therefore not necessary to provide a tape 330 during the recording and to put it in τ; »■■ er ■■ _> :. ns Mi ^ rIiXi, - tr.xt den, Reference3C8 atcr 3 <ό »Ultimately 'becomes the,' - re'.e

0 C '■ ■' ■ / 0 6: 1 ■■

BATH ORIGiMAL

The aim is to reproduce the data. As already mentioned, distortions of the data that occurred during the recording are represented directly in a variable wavelength of the signals in the reference track, even if the transmitter 333 at the Record applied reference vibrations at a constant frequency to such a high degree that at a constant speed the wavelength of the signals should be constant.

The reproduced reference signal has a variable Phase and a variable frequency corresponding to the variable wavelength of its recording as a result of the tape speed deviations during playback. Also changed the reproduced reference signal changes in accordance with the tape speed fluctuations during playback.The total deviation is available in channel 368 as a deviation signal, that for operating a brake control unit 339 for the tape drive 331 is used. The brake controller 339 closes a loop for the feedback control of the belt speed in such a way that that the signal in channel 3ö8 is kept constant, which is the set setting of the brake control during the recording represents

It should be noted that the tape drive unit for the facsimile transmission is only sensitive to so-called quasi-stationary deviation signals in the very low frequency range. The addressing features of such a tape unit are shown in FIG shown as a dot-dash curve. The curve represents the relative amplitude of the band speed fluctuations, with the input signals for the brake control 339 having the same amplitude Fig.θ have frequencies plotted on the abscissa · The

Curve shows the maximum response for signals with the frequency Hull

009834/0639

BATH ORIGINAL

4th

which represents the quasi-stationary Pall. The curve shows you pretty steep drop at frequencies that exceed a few Hz.

As previously described, the servo loop only moderately removes tape flutter on the order of 10 Hz. To eliminate the effect of tape flutter caused by displacement deviations with a frequency lying in this range, and which are significantly above the speech capabilities the tape drive unit itself, becomes the reference signal in addition to determining the unstable period of the monovibrator 346 in the data transmission channel. To this end the circuit described below is provided.

The reproduced reference signal is appropriately branched from the output of the Schmitt trigger circuit 362 and fed to a differentiator 369 · It can be assumed that each Pulse edge is differentiated so that the repetition frequency of the output pulses 369 * .Double the frequency of the reproduced Reference signalB is. The output pulses or peaks 369 ' des .Differenziator are used to control a narrow band frequency discriminator 370 uses * The input element of this discriminator 370 consists of a transistor 371, the base electrode of which is supplied with the pulses 369 ', the transistor 371 being supplied briefly becomes conductive · This process is preferably carried out via the Saturation level controlled beyond. When saturated, transistor 371 conducts for substantially the entire short period of these impulses or peaks 369 'If the transistor 371 is conductive, so one becomes the collector and emitter electrode of the Transistor locked capacitor 372 discharged. With non-conductive In transistor 371, the capacitor 372 is charged via a transistor 373, in the emitter circuit of which there is a sailing resistor 374

009834/0639

is switched on. The setting of this resistor 374 determines the charging speed of the capacitor 372. The collector • gate potential of the translator 373 changes alternately accordingly the rapid discharging and gradual charging of the capacitor 372. That on the collector electrode of the transistor 373 lying potential is therefore sawtooth wave-shaped, as shown by the wave train 373 *.

The changes in the amplitude peaks of this output signal 373 * represent the instantaneous frequency deviations of the Input pulse train 369 *, so that these amplitude fluctuations s * ultimately the phase and frequency deviations of the Represent the reference signal from the signal supplied for recording The collector potential of the transistor 373 operates a transistor 375 »whose emitter electrode via several diodes 376 a Gate voltage receives up to a level that changes very little with the Ssiitterstrom. The transistor 373 therefore becomes essentially operated as a switching transistor and is therefore alternately conductive and non-conductive.

As long as the instantaneous amplitude of the signal 373 * is below a certain level, the tran- ™ sietor 375 remains non-conductive. If this level is exceeded, the transistor 375 becomes conductive when saturated. The output of transistor 375 can be derived from the collector electrode, for example, and consists of a train of pulses 375 'having still exactly twice the frequency of the reference signal. The width of the pulses 375 'changes β ion with frequency. Each sawtooth wave 373 * reaches a relatively higher peak level at a lower frequency than at a higher frequency. Hiernaoh to dl · pulse width changes of the collector electrode of the transistor 375

009834/0639

derivable pulse train inversely linear with the frequency from the but only within a narrow range of reasons explained below Range «The pulse width can also be adjusted with the help of the resistor 374. A faster (slower charging, i.e. a steeper (flatter) rising plank of the sawtooth leads to an earlier (later) exceeding of the address level, in which the transistor 375 becomes conductive »

The pulses 375 'become the base electrode of a transistor 377 supplied. The emitter circuit of transistor 377 contains an HC network 378 and the whole circuit operates as a Integrator that covers the entire carrier frequency band of the reproduced ^ frequency-doubled reference signal. The integrator generates a direct current output, the amplitude of which is essentially the Is the voltage-time integral of a pulse 375 *, which has a Pulse period and. has been integrated over the following break. The integrated value depends to a large extent on the frequency of the input signal to the integrator, i.e. on the pulses 375 '. The characteristics of this integrator are shown in FIG and is explained below

If the pulse frequency, ie the frequency of the reference signal, is quite high, the peaks of the saw wave (373 ¹ ) do not reach the trigger level for the holding transistor 375, so that its output remains constant. The pulse width of the pulse train 375 ♦ is then zero, and the emitter potential of the transistor 377 remains essentially constant at B ⁺ . From this it can be seen that this occurs at a certain frequency f * when the sawtooth peaks reach the threshold level of the transistor 375 , as well as for all higher frequency values. Conversely, at fairly low frequencies the periods are quite long,

009834/0639

in which the transistor 375 is conductive, so that the emitter electrode of transistor 377 is at Brdpotential most of the time. This means that when the frequencies are dwindling, the output of the integrator asymptotically approaches another constant level, namely the Brdpotentials There is therefore a frequency range, in which the DC output of transistor 377, which is at the same time the output of the integrator 378 varies negatively linearly with the frequency of the reproduced reference signal.

The characteristic shown with solid lines in FIG. 7 and the frequency f "characterize the beginning of the decreasing frequency, while at frequencies which are less than fp the output of the integrator 378 is essentially constant. Within the range between f ^ and f ₂ , the output signal of the integrator 378 falls with frequency, while above f ₁ the output signal is constant again, but has a different level. For a different charging rate of the capacitor 372, i. E. with a different bin division of the resistor 374 , the characteristic takes the form of the curves shown with dashed lines and dashed lines. The setting is chosen so that the frequency t _Q, which has twice the frequency of the recorded Bezugseignale, about drops of this characteristic in the center of the rectilinear Zweigea, and for the gezeiohnete with Yollinien in t he Fig · 7 curve was the setting chosen so · It follows that the elements 371 - 378, together with other elements not mentioned, form the narrow bandwidth discriminator 370 , which generates a variable equal output for input signals whose frequency lies in a range encompassing f ·.

Instead of the elements 369 - 376, dee could be used for controlling

009834/0639

Transistor 377 is used as the output of phase detector 364; however, is the present circuit preferable because the phase detector 364 operates in a lower frequency range so that the response from reference signal to reference signal is slower and delayed? whereas the frequency discriminator 370 has a faster and less delayed response, as described. The Grleichstromausgangssignal of the network 378 is not fully ripple free, so a filter that is represented by a low-pass filter 379 whose fall point is between 20 and 50 Hz is required, "The drawn in FIG _e 8 with solid line curve 379 'shows the characteristic of this low pass filter which passes% skew signals that are quasi-stationary and low frequency signals that represent tape chatter

For reasons still to be explained, the low-pass filter 379 has been supplemented by a coupling capacitor 380, which blocks out the direct current signals and the quasi-stationary signals, so that the arrangement 379-380 for frequencies in the order of magnitude of roa 10 Ez _9, e.g. τοη a few Hz to approximately 30 Hz as band filter acts · This "characteristic is shown in fig dtr" 8 machines with a unterbroohe- a line.

The output signal of the piltern network ·· 379-380 becomes a control device 381, which can consist of an amplifier, and the signal level in channel 347 for setting the unstable period de «Monovibrator 346 influenced. The amplitude The signal in channel 347 is variable according to the instantaneous speed fluctuations of the tape. The amplitude this control signal is higher when the tape is running too fast, and lower if the tape is running too slowly. If it's too big

009834/0639

Belt speed becomes the unstable period of the monovibrator 34-6 relocated and shortened if the belt speed is too low.

Let the timing offset signals and the reason for the activation of the capacitor 380 are briefly dealt with Shift the entire frequency range of the frequency modulation and could not possibly simply by shifting the phase Data signals are corrected is equivalent to. Therefore, only those speed and time shift deviations should be compensated by the present device, which can no longer be regarded as stationary or quasi-stationary deviations, and which. at one too high fluctuation rate (flutter) occur and from the Servo loop removed «This is the reason for using a band filter so that constant or prolonged speed deviations do not affect the deceleration control.

At a constant belt speed, the control unit 381 generates a constant signal with a certain level, as long as the speed remains constant regardless of its value or, in other words, if the frequency iB of the pulse train 369 * remains constant at the desired level or at a different level, so the integrator 377 and 378 generates a constant öleiohspannung whose value represents that frequency as long as these soloher in Bereloh of f ₂ -fj ^lie «t · I Betriebssustand leads to

009834/0639 bad original

a certain constant signal value in channel 347 »If the servo loop is used, this frequency can only be f _Q , Any brief phase shift in the successive pulses 3 ^! -9 'as a result of a brief speed deviation leads to a compensating change in the signal in channel 347, provided that this phase shift occurs sufficiently quickly, i.e. it can be perceived from pulse to pulse and corresponds to a rate of change in the frequency above a few Hz, slower G-rate changes are actually suppressed by the servo loop so that they do not occur.

During start-up, when the system can receive signals whose frequency increases from zero to the nominal frequency, the signal in channel 347 remains constant, since the flat, ie, constant characteristic (FIG. 7) of the narrowband discriminator is essentially constant DC signal on the output side ensures as long as the frequency is less than f «. If the servo loop begins to stabilize the system during start-up, the change in the frequency of the fluctuations of the integrator outputB (377-376 is still small and is therefore made by the band filter 379 -380 is not forwarded. It is therefore not to be expected that "a long transition period will occur * The deceleration control will only take effect when the nominal speed has been substantially reached and after the servo loop has substantially stabilized the system" around the effective range to enlarge the delay device, several monovibrators connected downstream, such as 346, all of which are controlled by the output of stage 381. This circuit may be advisable when the carrier frequency is quite high, causing the greatest unstable period of one

00983W0639

BATH ORIGINAL

each monovibrator can only be quite short, which makes the range is limited for each monovibrator.

The embodiments of the invention described above can be used by experts within the scope of the inventive concept Changes, modifications and replacements are made. The invention is therefore only defined by the appended claims limited.

Claims

009834/0639

BATH ORIGINAL

Claims (1)

Claims 1 »A facility that cooperates with a facsimile receiving, transmitting and reproducing system, which records the facsimile data from a source, which data can be generated locally or received from a remote transmitter, and which these patents at the time of transmission to a destination, e.g. 3 _o to a local image display device, reproduced or this data d transmits to a remote receiver, whereby a motor-driven recording medium is used for the storage and a control circuit for the motor, characterized by a circuit which generates a fixed alternating current signal for controlling the motor during recording the facsimile data for a source and a reference signal at a selected constant frequency, and by a second circuit which is responsive to the reproduced reference signal during data reproduction and which is further responsive to a reference signal at a selected constant frequency and a direct current signal generated from the phase deviation between the latter two reference signals as a substitute for the fixed direct current signal for controlling the motor, and characterized in that the reference signals are selected from several different sources for reference signals according to the choice of source and destination The facsimile data during the recording or reproduction of the data 009834/0639 BAD ORiGiNAL m 70 - 2 · Device according to claim 1, characterized in that the motor is coupled to the belt by a rotary speed gearbox and that the reference signals are derived from a source of a number of reference signals at different frequencies, the can be chosen to match the speed graduation for correspond to the carrier through the speed change gearbox. 3 «Device according to claim 1 or 2, characterized in that the carrier is driven at a higher speed and the reference signal has a higher frequency at the Establishing a connection of the recording / output device with a remote facsimile receiver or transmitter than in establishing a connection with a local facility producing or reproducing the facsimile signal. 4 ·· Device according to Claim 1, 2 or 3 »characterized in that the reference signal is derived from a source having a fixed frequency for the recording or the Reproduction while connected to a remote source or destination for the facsimile data, and that the reference signal comes from a local power source Existence of a connection of the recording-playback device is derived from the local source of the facsimile data or from a local image reproduction device local power source is operated. 5 · lin direction according to claim 1 or 4t, characterized in that the control circuit contains elements that respond to the fixed aieiohetrome signal or to the pulse signal 009834/0639 BAO ORIGINAL and a second DC signal for directly controlling the motor produce* 6 «Device according to claim 5, characterized in that the motor consists of an AC induction motor, and that the second DC signal acts as a variable brake « 7 »Eintrieb, device according to claim 6, characterized in that the control circuit contains a hold circuit which superimposes pulsating DC voltage components on the AC voltage operating the motor, and that the feat set DC signal or the DC voltage generated by the second circuit eynoh-ron a sawtooth wave generator with the Motor operating AC voltage controls for the formation of the pulsating DC component. 8 * set up according to. Claim 1, characterized in that that the second circuit contains means that act on the two Respond to reference signals and generate a pulsating waveform representing speed deviations, and that the second Circuit from the signal train that generates the set direct current signal Device according to Claim 1, 7 or 8, characterized in that the control circuit increases the difference between the change in the signal representing the phase difference and the instantaneous control exerted on the motor. 10. Device according to Claim 1 or one of the following claims, characterized in that the second circuit has a differential amplifier for generating the DC signal 009834/06 39 contains. BATH ORIGINAL 11 «Device according to claim 1 or one of the following Claims, characterized in that the control circuit contains a differential amplifier for the fixed or the equivalent direct current signal and additionally a fixed input receives ο 12 »Device according to claim 11, insofar as this is dependent on the claim 2, characterized by adjustable circuit elements that feed the fixed or equivalent direct current signal to the differential amplifier, whereby the fed signal is modified as a function of the belt speed determined by the speed change gearbox 13. Device according to claim 1, characterized in that the second circuit contains elements for transmitting a frequency-dependent signal which are in the range Transmit phase deviation signal changed by a few Hertz with the greatest gain 14 device according to claim 2, characterized that the transmission can be set in stages, and that the The frequencies of the reference signals correspond to the setting ratios of the gearbox. 15 · Device for reproducing information signals in particular of facsimile signals that are recorded on a movable carrier in a format that, when the information is reproduced, it can be represented as a lateral feature of a signal train, characterized by a transmission · 00983 ^ / 0639 ÖAD ORIGINAL 1762A10 means relating to the medium for reproducing the recorded information signals from a moving Carrier is arranged and generates a signal train, and by a circuit which is responsive to the signal train and a pulse train generated, in which the information is presented as a time characteristic, and by a device that responds to changes in speed responds and changed the timing characteristics of the pulse train 1 · Device according to claim 15, characterized by a Time reference signal recorded on the medium and the like that is reproduced and influenced the temporal characteristics 17 * Device according to claim 15 or 16, characterized in that that the circuit includes a variable delay device for the pulse train and under the control of the speed changes of the wearer. 18 * Device according to claim 17 »characterized in that the delay device contains a monovibrator which has a variable, unstable period and of the said | Pulses is triggered, and that the changing device has means which are connected to the monovibrator and, depending on the changes in speed, influence the duration of the unstable period of the monovibrator 19 linear direction according to claim 16, characterized in that the «the reference signal from a recorded signal with a constant frequency exists, that the changing device auoh contains an 8 narrow band frequency discriminator which reproduces the reproduced 009834/0639 BATH ORIGINAL Receives reference signals and generates an output signal that is varies with frequency within a narrow range, which range includes a frequency that has a certain relationship at constant frequency, and characterized in that the delay means receives said output signal and influences the delay as a function of the changes in the output signal Apparatus according to claim T9, characterized by a low-range band filter which responds to flutter frequencies of the movable carrier which are substantially outside the addressable range of the moving means and which affects the movement of the movable carrier, and characterized in that the Band filter receives the output signal of the narrow band frequency discriminator and routes its output to the delay device, the delay of which is changed. 21 · A device according to claim 15 to 20, characterized net gekennzeich, the information daat a frequenzmoduliertee ale or ale phasenwinkelmodulierfcee a signal is recorded. 009834/0639 BATH ORIGINAL