DE2130363A1 - Telephone number transmitter - Google Patents

Description

They are telephone number generators for the establishment of dial-up connections known in particular in telephone networks with mechanical memories, in which a certain number of Call numbers, for example fifty call numbers, through a corresponding setting of switching wheels, switching cams or similar means can be stored. Should a specific phone number for the purpose of establishing a dial-up connection sent out v / ground, the relevant call number is looked up in a control panel and its transmission, for example triggered by pressing a key assigned to the memory containing the relevant call numbers. Apart from this, that these electromechanical call number generators take up a lot of space and the storage of call numbers is time consuming, they have the disadvantage that the search for the stored phone numbers in the control panel and the triggering The transmission require a high level of operating effort, which is particularly noticeable unpleasantly when individual numbers have to be sent out repeatedly because, for example, the selected subscriber station is busy is.

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There are also purely electronically working telephone number generators are known, but they only have a single memory Record a phone number. In these, each is marked with - " by one of the. telephone number dialed from usual dialing devices entered before the number is sent out. With the memory a display device for the entered call number is coupled through which a control of the stored call number is made possible for their correctness. The call number is only activated after the check has been completed by pressing a corresponding actuator sent out. There is also the possibility of repeated transmission of the saved Call number, for example, in the event that the due ™ chosen participant position should prove to be occupied. The primary task of the electronic number generators is to deal with incorrect connections, especially in the national long-distance dialing to prevent their multi-part phone numbers. The disadvantage is that the connection is completely handled, i.e. a long-distance call for example, must be finished before the well-known number transmitter for the production of another self-dialing connection can be used. This is particularly unpleasant »when connections are busy or a selected subscriber position is occupied and in the time until the next attempt to vote is actually already one other connection could be handled.

f The mentioned disadvantages of the known number transmitter are avoided in an electronic number transmitter according to a proposal by the applicant that does not belong to the state of the art. This call number transmitter has several electronic, optionally readable memory for receiving a call number in each case, 'in which the call numbers manually dialed in a known manner by means of a dialing device can optionally be entered while they are sent out at the same time. This makes it very flexible and varies from case to case. It is possible to compile such numbers as

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did not immediately lead to a connection when they were first selected and therefore wanted it to be sent repeatedly will. The aim of the invention is to query the memory and to send out the stored call numbers in the case of the proposed Design number transmitter or a comparable number transmitter so that the number transmitter only has one Requires minimal operating effort and nevertheless the fast one, adapted to its versatile storage options and enables versatile production of dial-up connections.

Starting from. a call number transmitter for the establishment of dial-up connections in communications networks, in which manually dialed numbers can be entered into one of several electronic memories and can be read out from these optionally into a converter that corresponds to the number read out and is suitable for performing the self-dialing Sends call number signal, this is achieved according to the invention in that the memories are assigned a step-by-step interrogation device, by means of which one or more of the memories can be controlled individually one after the other to read out the contents of the respective memory in the converter, and that a detector circuit for recognizing the message network own busy signal is provided, which triggers the progression of the interrogation device when the busy signal occurs. ^%

In the case of the call number transmitter according to the invention, the operator is the trouble of looking for the individual stored phone numbers, triggering their transmission and then to check whether the selected connection is actually established. In the case of the call number transmitter according to the invention, only an easy-to-manage switching of the interrogation device is still necessary. Through the detector circuit, which recognizes the busy signal of the communication network, it is also ensured that the switching is only then is necessary if a connection has actually been established

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is coming. In the increasingly frequent cases, particularly in telephone traffic, that the connections to the selected subscriber or the subscriber themselves are busy, the detector circuit ensures that the interrogation device automatically switches to the next memory. The use of the busy tone as a criterion for advancing instead of the dial tone has the particular advantage that the call number transmitter works correctly even in special cases, for example when a dead subscriber station or an automatic announcement is dialed in the telephone traffic that has no or only a very short previous dial tone is activated. In the same way, the number _{transmitter also works satisfactorily in international remote dialing r,} in which the busy signal that can be recognized by the detector circuit cannot be received. However, in such a case the user "has to recognize the foreign busy signal and, if necessary, switch the interrogation device manually. The busy signal is also more advantageous than other characters for the security of recognition, since it always occurs with multiple repetitions. That the interrogation device the individual memory containing call numbers to be sent out schematically has the advantage that “no call number provided for repeated dialing can be forgotten to be sent out by mistake.” It is ensured that in the course of a cycle of the interrogation device the Dialing of all the numbers provided is attempted once.

In a preferred development of the invention, the user has the option of simply pressing a button selectively determine the memory to be detected by the interrogation device. This further education is characterized by that the interrogation device has a ring counter with a number of counting positions equal to the number of memories and with several outputs, each assigned to a counting position, as well as a means for each memory an actuating button comprises a switchable flip-flop, and that

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the output of a flip-flop and an output of the ring counter are connected to an AND element, its output signal is used for read-out control of the memory assigned to the respective flip-flop. With this training is the ring counter is the actual switchable element. Means the user sets the flip-flops that are assigned to the memory to be queried. As soon the output signal of a set flip-flop with the output signal corresponding to a specific counting position of the ring counter coincides, the memory assigned to the set flip-flop is used to read its content into the converter controlled, whereupon the converter automatically emits the call number signal corresponding to the stored call number. at the reset flip-flops have no coincidence and, accordingly, no reading of the content of the assigned memory occurs. In order to make it clear to the user which memory is currently being queried, the operating buttons For example, be assigned indicator lights that light up or not depending on the position of the associated flip-flop.

In the further development explained, the operation can be carried out by an even more extensive automatic switching of the Interrogation device or the ring counter are simplified.

ΤΛ- τ. · Ί-j. jj, j ring counter _,, _ .. _ This is done by the fact that äerraxi a pulse generator generating incremental pulses is connected, and that the output signals of the AND elements are fed via an OR element to an input of a further AND element that is connected to a second input receives a falling signal from the detector circuit when a busy signal occurs and whose output signal is used to block the supply of incremental pulses to the ring counter. The ring counter is automatically incremented by the pulse generator as long as the further AND element does not emit an output signal. This out

output signal can only arise if a coincidence between a flip-flop output and an output of the ring counter occurs. It is thereby achieved with simple means that the interrogation device does not

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stops unnecessarily at such memories whose reading out by the user is not even desired. The renewed switching of the interrogation device through a recognized busy signal is also implemented in the simplest manner in this embodiment by supplying a signal that drops when the busy signal occurs to a second input of the further AND element. If this signal is absent due to a busy signal, the output signal of the further AND element also disappears, whereby the ring counter receives incremental pulses again and continues to be set. The blocking of the supply of stepping pulses in the ring counter W may for example take place in that a turn-off by a bias ^ pulse generator and is used as switching off t-bias voltage directly the output of another AND gate used. :

The further AND element offers a simple one Possibility to implement further functions of the call number transmitter that simplify the operation. For example is a very simple intentional switching of the interrogation device by means of a manual, for example by means of a Tastscbahlters, adjustable bias possible, which is fed to a third input of the further AND element. Sofc as long as the bias voltage is switched off, no output signal of the further AND element can arise, so that the ring counter is advanced despite any coincidence that has been reached. To prevent the connection to an elected Subscriber who does not answer, is occupied for too long, can continue to use the output signal of the further AND element triggerable timing element, for example a monoflop, be provided which, after the time has elapsed, is sent to a fourth Input of the further AND element briefly interrupts the distant signal. In the simplest case, this is the distant signal the output signal of the timer, because after the time has elapsed, it is switched off in a pulsed manner. The shutdown or interruption has the consequence that the output signal of the further AND element is missing and the ring counter again up to

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a coincidence assigned to another memory is advanced will. 40 seconds has been found to be an appropriate delay time for the timer in telephone traffic. A continuous call is therefore canceled after 40 seconds. To prevent the same resolution at connections actually made happens, the distant signal can be fed to the further AND element via an OR element be, via which the further AND element also a subscriber device in operation, so for example when the telephone receiver is picked up, receives a pending signal which indicates the shutdown caused by the timer of the distant signal.

In the case of the call number generator, which was explained at the beginning and proposed by the applicant, the memories are preferably through Dynamic shift registers are formed in which the call numbers can be stored digit by digit in binary-coded form. Dynamic Shift registers are available and allow very inexpensive as one-piece components in a fully integrated form in this form, the advantages of the integrated circuits familiar to the person skilled in the art, namely the small space requirement, to take advantage of the high working speed and the high level of operational reliability. When using dynamic Shift registers as a memory result in a particularly useful one Embodiment of the invention when the converter receiving the content of the memory queried in each case sends a to the Series-parallel converter that can be connected to a memory and a binary counter that can be incremented by a dial pulse generator comprises, between the outputs of a comparison element is inserted whose coincidence pulse to stop the means the output signal of the further AND element started dialing pulse generator is used. Here is a relatively simple one A means of converting the content read out with the relatively high clock frequency of the dynamic register into the Dialing impulses composed, relatively slowly to be emitted Call number signal as well as the necessary recoding at the same time

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achieved. To initiate the implementation, it is more advantageous Way of that on an achieved coincidence between the output of a flip-flop and an output of the ring counter declining output signal of the further AND element Ge • custom made.

To separate the busy signal from the one on the subscriber line pending signal mixture, various conventional means can be used. One is preferred Detector circuit, which may have an active bandpass filter and timers matched to the pulse spacing and pulse length of the busy signal to be recognized. Through the "Double check for frequency and shape of the busy signal a high level of security of detection is achieved.

The following is the invention with further advantageous Details are explained in more detail using an exemplary embodiment illustrated by a block diagram. The embodiment relates to the establishment of telephone connections. All statements apply accordingly, of course as well for the establishment of telex or other communication connections. ·

The phone number shown as an embodiment- " Transmitter is connected to the trunk line 2 leading to a telephone set 1 of the usual type. The telephone set 1 has the well-known dial as a dialing device for the call numbers, by means of which a call number signal can be generated in the form of series of digits according to a counting code and can be sent to the exchange line 2. With others Words becomes one of the for each dialed digit of the phone number Number of pulses equal to the number of digits generated with a defined pulse duty factor. Between the individual series of digits a time interval, the so-called free election time, is observed, to be able to distinguish the individual digits. The free choice time is normally 1 second and is Voting achieved through the compulsion to have to open the rotary dial. Of course, the number sender must call

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Generate number signals of the same composition.

The call number transmitter has five memories 15a to 15e for storing the call numbers to be sent out. In every store a call number can be entered according to the user's choice. The means for entering the phone numbers are not an issue of the invention and therefore not shown. However, they preferably include a buffer memory which is automatic picks up each phone number dialed by the telephone set 1 and broadcast at the same time and from which the stored number can optionally be transferred to one of the memories after dialing is complete. The memories 15a to 15e are each formed by a dynamic shift register and are given a constant circulation of their contents Clock pulses from a common clock pulse generator 9. The call numbers are four-digit digits in the shift registers stored in binary-coded form. An AND element 17a, 17b ... or 17e is assigned to each memory 15 the content of the memory is always available at an input. When a read-out signal is fed to the other input of the AND element is, the content of the respective memory on an output line common to all memories, which leads to a Implementer leads.

The converter has a series-parallel converter 8 at the input, which can be switched from series to parallel operation by a 4 bit shift register is formed, which v / ie die.Speicher T-aktimpulse receives from the clock generator 9 and therefore is incremented in series operation synchronously with the memory 15. To convert the normally in parallel operation A synchronizing pulse emitted by a synchronizing circuit 5 is used to operate the 4-bit shift register 8. The sync pulse has the duration of four clock pulses and causes one to four specific dynamic positions of the memory or shift register controlled for reading, that is a digit of the call number serially into the 4-bit shift register 8

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got. After the sync pulse has ceased, the binary signal is available at the four parallel outputs of the shift register 8th.

The synchronizing signal is also fed to the reset input of a binary counter 4, which also has four has parallel outputs for a four-digit binary signal that indicates the respective count of the binary counter. At

A 4-bit comparator 7 is connected to the outputs of the shift register 8 and the binary counter 4 and emits a coincidence pulse when the contents of the shift register 8 and the binary counter 4 are identical. The incremental input of the binary counter 4 is connected to the output of a dial pulse generator 10 which generates dial pulses of a duration and frequency equal to the required digit pulses. The dial pulse generator 10 can be switched on by the synchronizing pulse from the Synchroni si circuit 5 and switched off again by the coincidence pulse from the comparison element 7. The binary counter 4, which is reset to zero by the synchronizing pulse, is switched on by the dial pulse generator until its counter reading equals the content or the number in the 4-bit shift register 8. In this case, the dial pulse generator 10 emits a number of dial pulses equal to the digit, which, in addition to the binary counter 4, are fed to a relay selector 30 and cause it to output a series of digit pulses corresponding to the digit to the exchange line 2.

The call numbers were in the memories or shift registers 15 each with a fixed assignment of each digit or each digit of the call number to four specific dynamic positions stored in the shift register. For addressing or marking the positions in the memories, there is also a during the entry of the phone numbers in the memory operating position counter 12 is provided. The position counter 12 is from Clock pulse generator via a corresponding to the four-digit Coding with the division ratio 1: 4 working frequency

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divider 13 advanced. * The number of steps in the position counter 12 is a quarter of the number of stages in the shift register 15, so that it requires the same time as this for one cycle. The individual counter readings of the position counter thus each identify four specific dynamic positions the shift register. The position counter 12 has five parallel outputs, at which its respective count in in binary coded form. In the same way, a remote counter has the same number of stages as the position counter 12 five parallel outputs, which keep its respective counter reading in binary-coded form. The digit counter 6 tracks the number of digits sent out or series of digits. To the outputs of the position counter 12 and the outputs of the Digit counter 6 is connected to a 5-bit comparator 14, which for the duration of each coincidence of the counter readings Both counters emit a comparison pulse to the synchronization circuit 5.

The reset input of the digit counter 6 is a An output signal indicating the beginning of a dialing process is supplied by an AND element 24. The same output signal arrives Via an OR element 16 to a delay element 11 designed as a dynamically triggerable monoflop, which introduces the necessary free choice time of one second. The incremental input is at the output of the delay element 11 of the digit counter 6 and a preparation input of the synchronization circuit 5 are connected. This causes that the numeric counter is incremented 1 second after it has been reset, and also the synchronization circuit 5 is prepared in such a way that it forwards the next comparison pulse from the comparison element 14 as a sync pulse. This happens as soon as the position counter 12 reaches the countersink 1 achieved. It is therefore ensured that when reading out the call numbers from the memories 15 with the first, the highest Significant digit is started. The preparation of the synchronization is done by the trailing edge of the passed Comparison pulse reversed, so

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that a new sync pulse is only issued after renewed preparation. Reading out and placing the second digit a call number is initiated by the coincidence pulse from the comparator 7, vuelcte? to this via the member 16 also to the Delay element 11 is supplied and via this the incrementation of the digit counter after observing the free selection time 6 and the renewed preparation of the synchronization circuit 5 causes. If all digits of a phone number have been read out, the shift register 8 no longer §signal, so that the comparison element 7 emits a constant coincidence signal which constantly stops the dial pulse generator and is no longer able to trigger the comparison element 11.

For the optional generation of the read-out signals which are fed to the AND elements 17, a step-by-step progression is possible Interrogation device provided. This includes a "ring counter 18" with five outputs that are activated when the ring counter is incremented are excited individually one after the other. The ring counter 18 receives its incremental pulses from a frequency of approximately 0.5 Hz working pulse generator 19. This is by the output signal of the AND element 24 for the duration of Signal can be switched off. The interrogation device further comprises five flip-flops 20a, each assigned to one of the memories 15,

20b and 2Oe. Each flip-flop is activated by an

button 21a, 21b .... or 21e * can be switched. Each actuation button 21 contains an indicator lamp which is switched by the assigned flip-flop and lights up when the flip-flop is set. Each flip-flop 20 has its output connected to one input of an AND element 22a, 22b ... or 22e, the other input of which is connected to one of the five outputs of the ring counter 18. If an AND element is 22 receives a signal at both inputs, it generates an output signal that is used as a read-out signal to the AND element 17 of the associated Memory 15 is supplied. A specific memory 15 is therefore only read out when the assigned flip-flop 20 is set and the ring counter 18 assumes its counting position assigned to this flip-flop.

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To the outputs of all AND elements 22, the inputs of an OR element 23 are connected, the output of which with a Input of the AND element 24 is connected. Provided that the other inputs of the AND element 24 Signals received, with the result that, as soon as coincidence is signaled via one of the AND elements 22, the AND element 24 the An output signal is generated which switches off the pulse generator 19 and thereby interrupts the incremental switching of the ring counter 18 and also the reading out of a call number and the formation of the corresponding call number signal in the above triggers as explained.

A coupling circuit 3 is connected to the exchange line 2 a detector circuit 26 for detecting the busy signal of the telephone network is connected. The detector circuit 26 includes a bandpass filter matched to the pitch of the busy signal as well as to the pulse spacing and pulse length timers coordinated with the busy signal. The detector circuit 26 gives a signal to a further input for as long of the AND element 24 from how no busy signal occurs. As soon as a busy signal is detected, the output signal drops the detector circuit 26 and thus also the output signal of the AND element 24, so that the pulse generator 19 for Continuation of the query starts again and also due to a supply of the output signal from AND member 24 to the relay selector 30 a possibly unfinished dialing process aborted will. The ring counter 18 can be incremented by hand with the same sequences by means of an actuating button possible, by means of which a voltage normally supplied to a further input of the AND element 24 is switched off.

In order to re-initiate the incrementation of the ring counter 18 even in the event that no. Busy signal occurs, but a selected participant did not answer within a reasonable period of time tested a monoflop Timing element 27 is provided with a delay time of 40 seconds. The timing element is activated by the leading edge of the Output signal from AND gate 24 triggered. Usually

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The signal-carrying output of the timing element 27 is connected to a fourth input of the AND element 24 via an OR element 28. When the timing element 27 elapses, its output signal is briefly interrupted and thus also the output signal of the AND element 24 and, as the ring counter 18 then starts to advance, the previously existing τ JCoincidence is also eliminated so that the output signal of the AND element 24 to fails to reach the next coincidence.

To avoid having one with a participant The connection that has come is interrupted by the timing element 27, the second input of the OR element 28 becomes a abhabenem.Hörer des Telefonapparates 1 pending signal supplied that the signal drop at the output of the timer 27 does not take effect. The higher signal that has been picked up is transmitted in the coupling circuit 3 educated. It is also fed to an input of five AND elements 29a, 29b ... or 29e, each of which is your A direct reset input from one of the flip-flops 20 is connected upstream are. The other input of each AND element is connected to the output of the ring counter assigned to the relevant flip-flop 18 connected. Since the flip-flops 20 by signal return flags are resettable, that flip-flop with which the ring counter 18 ″ is in coincidence is through after the call has ended Hang up, put the handset back and thereby avoid that an already successfully dialed number is automatically dialed again. Of course, the new one can be done on purpose Dialing the number can be brought about by setting the relevant flip-flop again using the actuation button 21 will. By resetting the flip-flop, what is particularly important, the ring counter 18 due to the elimination of the coincidence, it starts up again immediately after hanging up the handset.

The frequency of the pulse generator 19 need not, of course, be exactly 0.5 Hz. Due to the frequency of 0.5 Hz

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a minimum time interval between the end of a call or a dialing and the beginning of a new dialing of 2 seconds and thus a minimum time interval between two dialing of the same number of 10 seconds with five memories. By changing the frequency of the pulse generator 19, these time intervals can be changed as needed.

In order to make it clear to the user that he has to expect an answer from a called subscriber, a message to the External line 2 connected amplifier with loudspeaker be provided, but during the actual process and remains switched off when a busy signal occurs. Of course, an optical display can also be provided instead be. For example, the indicator lamps in the buttons 21 with flickering light can be used for this purpose.

/ Claims

209852/0434

Claims (8)

Claims Telephone number transmitter for the establishment of dial-up connections in communication networks, in which manually dialed numbers by means of a dialing device optionally in each case one of several electronic memories can be entered and optionally read out from these into a converter, which is a number signal that corresponds to the number that has been read out and is suitable for performing self-dialing settles, characterized in that the memory (15) has an interrogation device which can be incremented (18-22) is assigned, by means of which one or more of the memory individually one after the other for. Reading out the content of the respective memory in the converter (4, 7, 8, 10, 30) are controllable, and that a detector circuit (26) for Detection of the message network's own busy signal is provided, which when the busy signal occurs the switching of the interrogation device triggers. 2. Call number transmitter according to claim 1, characterized in that the interrogation device (18-22) has a Ring counter (18) with a number of counting positions equal to the number of memories and with several, each one counting position assigned outputs and for each memory (15) a flip-flop which can be switched over by means of an actuating button (21) (20) comprises, and that in each case the output of a flip-flop and an output of the ring counter are connected to an AND element (22) are, whose output signal is used for read-out control of the memory assigned to the respective flip-flop. 3. Call number transmitter according to claim 2, characterized in that g e k e η η that the ring counter (18) is connected to a 72 9852/0434 Switching pulse generating pulse generator (19) connected is, and that the output signals of the AND elements (22) via an OR element (23) to an input of a further AND element (24). Are fed, which at a second input a falling signal when a busy signal occurs from the Detector circuit (26) receives and its output signal to block the supply of incremental pulses to the ring counter serves. 4. Call number generator according to claim 3> characterized by g e k e η η draws that a third input of the further AND element (24) has a manually adjustable (with 25) bias is feedable. 5. Call number transmitter according to claim 3 or 4, characterized in that a through .das output signal the further AND element (24) triggerable timing element (27) is provided is which, after the time has elapsed, a distant signal present at a fourth input of the further AND element briefly interrupts. 6. Call number transmitter according to claim 5, characterized in that the distant signal is the further AND element (24) is supplied via an OR element (28), via which the further AND element also has an in-use Subscriber device (1) receives pending signal. 7. · Call number transmitter according to one of claims 3 to 6 with memories formed by dynamic shift registers, in which the call numbers can be stored digit by digit in binary coded form, characterized by that the converter (4, 7, 8, 10, 30) has a series-parallel converter (8) that can be coupled to the memory (15) and a through a dial pulse generator (10) incremental binary counter (4) comprises, between the outputs of a comparison element (7) is inserted, the coincidence pulse for stopping the means the output signal of the further AND element (24) started dialing pulse generator is used. / 3 209852/0434 Λ * 8. call number transmitter according to one of claims 1 to 7, characterized in that the detector circuit (26) a bandpass filter and timing elements matched to the pulse spacing and length of the busy character to be recognized includes. 1X29 209852/0434