DE2002160A1 - Dialing - Google Patents

Description

JOIlANNES GERARDUS HAAS UTRECHT / Holland

Selector circuit

The invention relates to a selection circuit for use in a subscriber station equipped with an automatic responder in a telephone system.

It is known that in a subscriber station a telephone system an automatic responder can be arranged. the is connected to the subscriber line in place of the subscriber intercom, so that when a call is received, the calling subscriber certain information, such as instructions on how to vote a different number, a message regarding the change of the Participant number etc. to be issued. In particular, be automatic Responders are increasingly being used by general practitioners, dentists and other doctors, to a patient who is in their absence or on a weekend calls, in which they are not on duty, to a steep substitute Referring colleagues.

Although the use of such a responder on the one hand On the other hand, it has certain advantages associated with the restriction that when the responder is connected, the subscriber in question cannot be reached by telephone. This can be undesirable, especially when a doctor uses a responder

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Consequences if, for example, a patient of this doctor is referred by a deputy colleague due to a specific complaint Treatment is conveyed to the hospital while receiving a telephone call Consultation with the doctor concerned would have to be clarified that this complaint was related to a specific condition of the patient and an admission of the patient would not have been required to go to the hospital.

The invention now aims to provide a circuit for use in a with a automatic responder equipped subscriber station available make with which the above-mentioned disadvantage is eliminated according to the invention in that this circuit is set up in such a way that of you when receiving a call by means of a predetermined, adjustable Ringing pulse code generates a signal for connecting the subscriber intercom to the subscriber line and when received of a call without this code of the one connected to the subscriber line automatic responder is turned on.

The circuit according to the invention offers the possibility of when the automatic responder of a subscriber station on a subscriber line is connected, a telephone connection. to establish a connection with the relevant participant / through Use of a series of ringing pulses coded in a certain way. Because this code is only disclosed to certain people and can be further changed as needed, remain those associated with the use of an automatic responder Advantages of using the circuit according to the invention completely preserved.

The invention is explained in more detail with reference to the accompanying drawing, in which a block diagram of the inventive circuit with a

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Example of a coded series of supplied to this circuit Call pulses is shown. ■ ■ - ■ * ■

The circuit is composed of an input circuit I, four AND gates, A, B, C and D, four timing circuits TS1, TS2, TS3 and TS4, two relay circuits R1 and R2 and a signal circuit S. -.

The AND gate A has three inputs a., A, and a_, the AND gate B two inputs b, and by, the "AND gate C three inputs ο.» c, and Cj and the AND gate D two inputs d ₁ and d_ '. The timing circuits TSl and TS4 each have an output χ and χ, while the timing circuits TS2 and TS3 each with two outputs χ, * y_ and χ , y are provided.

The AND gates A, B-, C and D each have an output which the time control circuit TSl, the time control circuit TS3, the relay circuit Rl or the relay circuit R2 are connected. The time control circuit TS2 is at the output χ. of the time control circuit TSl connected, during the time control circuit TS4 as well as the signal circuit S are connected to the relay circuit Rl.

The inputs a, a and a_ of the AND gate A are connected to the output u of the input circuit I, the output x_ of the time control circuit TS2 and the output χ. of the time control circuit TS4. The inputs b and b of the AND gate B are connected to the output X _{1 of} the time control circuit TS1 and the output y_ of the time control circuit TS2. The inputs ς, c, and c_ of the AND gate C are

'J. Cl J

connected to the output u of the input _{circuit I, the output X 1 of} the time control circuit TS1 and the output x_ of the time control circuit TS3. The inputs d ^ and d of the AND gate D are connected to the

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Output u of the input circuit I or the output y of the time control circuit TS3 connected.

The AND gates A, B, C and D are set up in such a way that they, if the same signals with a first level are fed to all inputs, a signal with a second level at their output They deliver levels, while if a signal with the last-mentioned second level is fed to one of their inputs, they deliver at their output deliver a signal with the first-mentioned level.

The timing circuits TSl and TS4 are monostable multivibrators with a rest position and a working position, which are set up in such a way that they deliver a signal with the first-mentioned level at their outputs χ and χ in the rest position and a signal with the second-mentioned level in their working position . The timing circuits TS2 and TS3 are also monostable multivibrators with a rest position and a working position, which are set up in such a way that in their rest position they deliver signals with the first-mentioned level at their outputs x_ and χ and signals with the second-mentioned level at their outputs y and y , while in their working position they _{supply signals with the second-mentioned level at their outputs x 9} and x and signals with the first-mentioned level at their outputs y_ and y. The time control circuits TS1, TS2 and TS4 are further set up in such a way that when a signal with the second-mentioned level is fed to their input, they are brought from their rest position into their working position and after a certain time after this signal is replaced by a signal with the first-mentioned level Level has been replaced, return to their rest position. The time control circuit TS3 is set up in such a way that, when a signal with the second-mentioned level is fed to its input, it is switched from its rest position to its working position and, regardless of the signal level at its input, returns to its rest position after a certain time. The timing circuits can basically

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can also be realized with the help of time switches, however preferably designed as a monostable multivibrator circuits.

The relay circuits R1 and R2 can basically consist of relays that are excited when a signal with the second-mentioned level occurs at the output of the relevant AND gate C or D and the associated contacts or circuits for exciting the timer TS4 and the signal circuit S. and close to switch on the supply circuit of the automatic responder. . _;

In the description of the operation of the circuit that follows, the signals with the first-mentioned level are referred to as signals "O ¹¹ and the signals with the second-mentioned level as signals ¹¹ I".

In the rest position of the circuit, that is, when no ringing pulses are fed to the input circuit I, this circuit supplies a signal ¹¹ I ¹¹ at its output u, and because this output is connected to an input of each of the AND gates A, C and D. , These gates each provide an output signal ¹¹ O ". The timing circuit TSl connected to the output of AND gate A and the timing circuit TS2 are also in the rest position, in which a signal ¹¹ O" is present at the outputs χ and x_ of these gates is, while the circuit TS21 supplies a signal "1" at its output γ. Since the output y ^ of the circle TSZ with. connected to the input b "of the AND gate B, this gate also supplies a signal" Q ¹¹ at its output, so that the time control circuit TS3 is also in its rest position. The relay circuits R1 and R2 are not energized * and are therefore located also the time control circuit TS4 in its rest position. .- "■■" .. ".,

If now the subscriber station in question is from another subscriber

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is called, ringing pulses are fed to the input circuit I via the subscriber line. The circuit I is set up in such a way that when it receives a ringing pulse it supplies a signal "O" at its output, and consequently the AND gate A becomes transparent when the first ringing pulse in a row is received, whereby a signal ¹¹ I "is generated at its output by which the time control circuit TS1 and also the time control circuit TS2 connected to the output of this circuit are switched to the working position / Since the output x_ of the circuit TS2 is connected to the input a_ of the AND gate A, this gate is activated as soon as the circuit TS2 has been brought into its working position, in which a signal ¹¹ I ¹¹ appears at its output χ, set in such a way that it cannot become permeable again when further ringing pulses are received. The AND gate B remains in its blocked state, in ^{to which a signal 11} I ¹¹ is now fed to input b of the timing control circuit TS1 connected to output χ Input c_ is connected to the output χ of the time control circuit TSl.

The time control circuit TS1 is set up in such a way that it returns to its rest position after a predetermined, adjustable time. The time control circuit TS2 is set up in such a way that it also returns to its rest position after a predetermined time after the circuit TS1 has returned to its rest position. As a result, when the timing circuit TSl returns to its rest position, a * signal ¹¹ O "occurs at the two inputs b and b of the AND gate B, whereby a signal" 1 ^{M is} generated at the output of this gate through which the timing circuit TS3 is switched from its rest position to its working position. The time control circuit TS3 is set up in such a way that it returns to its idle state after a predetermined, adjustable time, regardless of the signal at its input.

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situation returns. ^{When the time control circuit TS.3 is switched to its working position, another signal 11} I "is sent to the output x, the same connected input c, of the AND gate C and to the input d of the AND gate connected to the output y of the same D generates a signal ¹¹ O ".

If now during the time in which the time control circuit.; ,, - T53 is in its working position, another ringing pulse is received, then the input d of the AND gate D receives via the input circuit I a signal "0", whereby a signal "1" is generated at the output of this gate and as a result the relay circuit R2 is excited, so that the feed circuit of the automatic responder is closed, making it effective and thus the calling subscriber with the Responder is connected.

Occurs during the time during which the time control circuit TS3 is in its The working position is ^ no ringing impulse, then when you return this circle in its rest position again a signal "I" at the input d

of the AND gate D generated, whereby this gate can no longer be made transparent even when receiving any further pulses. Furthermore, when the time control circuit TS3 returns to its rest position, a signal ¹¹ O "* is generated on the input c of the AND gate C connected to the output χ of the same. Since on the input c_ of the AND gate connected to the output χ of the time control circuit TS1 C a signal ¹¹ O "is also present, this gate becomes transparent when a" further ringing pulse is received, which via the input circuit I-also generates a signal "0" at the input of this "gate, so that a Signal "I ¹¹ appears because the relay circuit Rl is excited. The excitation of the relay circuit Rl has the consequence that on the one hand the signal circuit S is excited and on the other hand the timing circuit TS4 is switched to its working position, whereby

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on the one with the exit χ. connected input a of the AND gate A a signal "1" is generated.

The time control circuit TS2 is set up in such a way that it continues until after the point in time at which the time control circuit TS3 is in its rest position returns, remains in its working position and therefore a signal "1" is on the "input a_ of the AND gate A supplies, whereby a switchover

Approx

this gate into the on state and, as a result, a renewed switching of the time control circuit TSl into its working position is prevented by the ringing pulses received after the first ringing pulse. This function of the time control circuit TS2 is taken over when the relay circuit Rl is excited by the time control circuit TS4, which is switched to its working position by the relay circuit Rl, in which it sends a signal ¹¹ I "to the input a of the AND gate A connected to its output χ The time control circuit TS4 is set up in such a way that it always returns to its rest position after a time that is slightly longer than the normal time between two successive ringing pulses, so that if the ringing pulse series is interrupted, the time control circuit TS2 returns to its Rest position the AND gate A and 'so that the whole circuit return to the original rest position.

The signal circuit S can basically consist of a wake-up circuit, when excited, the subscriber can connect his subscriber intercom with the subscriber line, or set up in such a way be that he establishes this last-mentioned connection himself.

The circuit described above offers the subscriber the option of setting the times after which the time control circuits TSl and TS3 after switching to their working position again in return their rest position to set a ringing pulse code at

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knowledge of this people even if the respondent with connected to the subscriber line, a connection with the subscriber be able to bring the intercom.

An example of such a coded ringing pulse series P is shown in the drawing. In this example it is assumed that the Time t ^ after which the time control circuit TSl after receiving a first Ringing pulse returns in its rest position, which corresponds to the time in of the three ringing pulses occur. After this time, the time control circuit is TS3 brought into its working position, in which it remains for a time t_. During this period of time t_ the AND gate D is controlled by the timing control circuit TS3 is set in such a way that, if a ringing pulse is received during this period, the gate D becomes permeable, whereby the relay circuit R2 energizes and the feed circuit of the automatic Be switched on.

However, if no call pulse is received during the period t_, then is returned to a stone rest position by the return of the time control circuit TS3 the AND gate D blocked against responding to further call pulses and instead the AND gate C for responding to such ringing pulses prepared. Is now after the time span t and before the point in time t at which the timer circuit TS2 returns to its rest position, a ringing pulse is received again, then η will AND gate C permeable, whereby the relay circuit Rl and the ' Signal circuit S are excited.

The call pulse code in question can be r in from the calling subscriber can easily be generated by first sending the agreed number of ringing pulses after the connection has been established waits, then interrupts the connection and re-establishes it after the also agreed time t.

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In the circuit described above, TSl can be used as a time control circuit instead of a monostable multivibrator circuit with adjustable Reset time also a combination of a bistable multivibator circuit and one between the output u des Input circuit I and the reset input of this multivibrator circuit arranged adjustable counter T can be used. This variant is indicated in the drawing with dotted lines.

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Claims (4)

PATENT CLAIMS Iy selector circuit for application in one with an automatic Responder provided subscriber station in a telephone system, characterized in that the circuit is set up in such a way that when a call is received by means of a predetermined, adjustable call pulse code, it sends a signal to the subscriber's intercom device through connection to the subscriber line generated and when receiving a call without this code the with turns on the automatic responder connected to the subscriber line. 2. Selector circuit according to claim 1, characterized in that the circuit has a first AND gate (A) with three inputs (a, a, a,), a second AND gate (B) with two inputs (b ^, b_), a third AND gate (C) with three Inputs (c., C_, c_) and a fourth AND gate (D) with two inputs (β-, d), an input circuit (I) to be connected to the subscriber line, which is set up to generate signals corresponding to the supplied ringing pulses . and the output (u) of which is connected to one input each of the first, third ** and fourth AND gates (a., c., d.), a first time control circuit (TS1) connected to the output of the first AND gate with a output (x.), the ^ver having an input (b) of the second second aND gate and to one input _(c?) of the third aND gate connected is a connected to the output of the first timing circuit second timing circuit (TSZ) with two Outputs (x_, γ,), of which one (x_) is connected to the second input (a) of the first AND gate and the other (y_) is connected to the second input (b_) of the second AND gate, one on Output of the second AND gate connected third time control circuit (TS3) with 'two outputs (x, Y ^)' of which one §c) with the third - \ 00 983B / 1BT0 Input (c) of the third AND gate and the other (y_) with the second input (b_) of the fourth AND gate is connected to a first relay circuit connected to the output of the third AND gate (Rl) for switching on a circuit (S) for generating a signal for connecting the subscriber intercom device to the subscriber line, to which relay circuit a fourth time control circuit (TS4) with an output (χ) is connected, which is connected to the third input (a) of the first AND gate is connected, and a second connected to the output of the fourth AND gate Relay circuit (R2) for switching the automatic responder on and off having, the whole circuit being set up such that when the automatic responder with the subscriber line is connected, when a call is received by the first ringing pulse via the first AND gate, the first and second timing control circuits are excited ', and the last-mentioned circle blocks the first AND gate and after one, a predetermined number of Rufimpulseii corresponding time span (t) that can be set in the first time control circuit by returning this circuit to its rest position das second AND gate made transparent and the third timing control circuit for the duration of a second period of time (t ") that can be set in this circuit is excited, in which of this third timing circuit such a signal is sent to the second connected to the second output of the same Input of the fourth AND gate is supplied that when a ringing pulse occurs during this period of time this fourth AND gate permeable and the responder is switched on, while, if in the second period (t) no ringing pulse occurs, by the return of the third time control circuit in its rest position, the fourth UNDr gate blocked and the third AND gate is prepared to go through to excite the first relay circuit within a time determined by the second time control circuit, welbher when excited, it also excites the fourth timing circuit, from which the 009838 / 181C first AND gate, after which the second timing control circuit in its Rest position has returned, is held by each subsequent ringing pulse for a time in the blocked state, at least the time span between two successive ringing pulses is equivalent to. 3. Selector circuit according to claim Z _1, characterized in that the timing circuits consist of monostable multivibrator circuits. - · 4. selection circuit according to claim 2, characterized in that the second, third and fourth time control circuit each by a monostable Multivibrator circuit can be formed during the first Timing circuit as a bistable multivibrator circuit with a Back part input is formed and the output of the input circuit via a counter with an adjustable counting capacity with the reset input this multivibrator circuit is connected. 0098 36/1810 Empty soap