DE1437438A1 - Telephone answering machine - Google Patents

Description

Patent attorney

-A. Brose

pipt .- 'ing. . ·: -: - ■ -

Munich-Puliach α λ q 7 4 q ο

S2T! Lchn 05/3

Wmn * rStf, 2nd year NiOncbt-n 1 05/3

X / Hs I "". ' -ι Munchen-Pullach, BVy.Iy64.

ΗΟΒΟΡΗΟΝώ 'LIMITED, Shropahire House, 179, OTotteaLiam Court Eoad, London, ii /. 1 '»/ England.

Telephone answering machine

The invention "relates to a telephone call answering device and in particular such a telephone call answering machine, dated by Owner can be called and queried, so that the answer machine those recorded during the absence of the signer Transferring phone calls to

Be a well-known telephone answering machine while 'in the absence of the owner, it is connected to the phone to save incoming phone calls to a memory, v ^ ie z.ü, tape or drum. At the lluckkehi the owner can disconnect the password from the phone and listen to the recorded calls.

So that in such a case the caller notices that he is using an automatic answering machine or ' Recorder says the \ answerers may be configured such that it through is an appropriate announcement to the caller ₀ Such a message can be as follows, for example: "This is the port number, ... _0, they speak with a phone call -üeantworter which during The absence of the subscriber is activated. Your call is recorded. Please speak now. ' ¹ The answering machine then records the incoming call “If the call ends after the caller hangs up or if he has an uninterrupted call

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Speaking time of 1o; "It ends within 15 seconds, then " stops "the answering machine stops recording and adopts the setting that makes it ready for the next call

Although known phone call responder - "for" sufficient most of the case, it would zweckmässigy in manchen- Pailen '^"; if the owner in his absence' the telephone call-loading" · responder to query for any recorded calls - '" Such a device would be particularly useful for a general practitioner who would not have to come home and listen to the answering machine in this way, but could do this listening from another connection In this case it is important that, only .the owner, α he answers it. ~ him. can listen by telephone and from this:,; Jrui.de "must be the Aufs'eieliner in ■ able to get a such-en call from the owner of another call to ^s; anterscheiden.." ■ ^": .---" - ^"\ - ■ ^{r -:} ' -

A telephone answering machine has already been proposed in which, for the purpose of this distinction, the normal recorded answer to the caller at a certain point is interrupted v / irci .-, v-uni the answer from the normal answer. The call answering machine then rotates the memory. s "10 seconds the tape 'b ^ w. the "'. ^: "' iro: .mel is empty -is to 'indicate that all -recorded calls have been played - .. urdeno the answering machine is banned- - ■; automatically in such a that it the next-ankömmenden arrival '■' - can record -ruf ₀ '' ■ ■ - ''"-----" - ..-; ■■ ■.. -

However, this well-known .Telefonanruf-3eanti ¥ orter has two serious -.- disadvantages. ' The -first> oh-part is- in it too " see that-only a few '' Bign ^ r such devices "take the 'trouble' -

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take to erase the tape after each use., If If this is not the pail, then the tape does not have a length of 10 seconds, for example no signals. on, but rather in connection with the Last recorded conversation Recordings of previous conversations that no longer exist at the present time interest, lia the phone call answering machine so not He cannot differentiate between older and younger calls, but does not stop playing back incoming calls continues to play back the contents of the memory until the tape or drum or the like. Has expiredc When this occurs, the machine switches off completely and can therefore only record incoming calls v / when the recording medium is renewed or rewound will. The second scnwerwiegen.de guard part can be seen in that is based on the well-known telephone call answering machine the default answer works and this is mostly considered inexpedient felt that every owner wants the telephone

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call answering machine ir. * r by himself - *> ^ ϊ ^: ^ κη> - ^ - ϊη ^ -designed

^ in the aim of the invention is therefore to such To improve telephone answering systems in line with these demands. A telephone answering machine that is used to record incoming calls while the owner is away can be connected to and operated by the telephone and the calls received after retrieval by the owner can play back via a phone call, according to the invention has a memory for recording more detailed Calls, means "for playing back the stored calls, switching means for perceiving an incoming query signal it and. a circuit, which in the case of corresponding interrogation signals switches and is connected to the recording circuit and is set up in such a way that it responds to a specific interrogation signal responds and the corresponding switching operations

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performs the 'required to play the stored calls are; the query sequential circuit has Frequencies responsive circuits, which on a · certain audio frequency are tuned and an actuation " prevent the switching if not a note of a certain 'pitch' during the audio frequency on the input line is maintained for a time of at least one second. '■.,

The main difference between the telephone call answering machine of known design and the one according to the invention is in that the well-known telephone call bearer by everyone any sound can be switched, which is perceived by him 'in the period provided for this purpose, during in the telephone call answering device according to the invention, this switchover Can only be made when a signal is one ■ eaiiigii, frequency is transmitted. Thus, in the invention The frequency of the interrogation signal is used to determine whether an interrogation is present and to be switched should and "not the time of receipt of the signal. Since the frequency of the interrogation signal in a relatively large Range can be selected, the possibility is very small, that the interrogation signal of an owner also to interrogate the telephone answering machine of another owner is capable.

The interrogation signal can be generated by a whistle, which the owner of the telephone answering machine carries with him and the answering machine can then only respond to such a call answer or switch if the corresponding note, i.e. frequency, is sustained for longer than a second. This ensures that the facility is not switched to query telXmiig will when the speaker happens to be using his pitch hits a tone of the appropriate frequency. \

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In one embodiment of the invention, the interrogation signal of Iiän ^ e "Elna can xiörbaren tone corresponding to a one ^ ij.en frequency UUV 7. ^r elch2n a second tone of a andsrsü I- ^ erjaenz ■ fol ^ t, thus the Teleforianruf-. If the audible ion does not have the predetermined length, then the telephone answering machine cannot be intercepted. To generate the audible tone, a portable sound generator is preferably used, which the owner of the telephone call Answerers' carry with him,

The tone generator can expediently generate two tones, the first of which is of such a frequency and length that the answering machine disconnects, this tone being in a second passes over, which is maintained permanently and thus the signal is transmitted to the answering machine, after the interrogation signal has ended. The answering machine can also be designed in such a way that it is only in the query hold state can be switched if the ζγ / eite tone is a. certain pitch, i.e. "frequency," in this way an additional security against unauthorized use. If desired, the tone generator can also generate more than two tones or a combination of time periods Tones and corresponding frequencies to the phone call answering machine to switch to the query switch position,

Subject all the embodiments of the invention described above the telephone call answering machine can be designed in such a way that it is switched to the interrogation position several times in a row can be. This can be achieved by such a design that the answering machine switches the memory back to a position after an interrogation process has taken place is in front of the one at which the interrogation signal was recorded was and that then the responder in the receptive Position is switched so that the next

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recorded call rom save the previously recorded query, -, signal deletes, ..-.-. _;: - _.___ .. _: .. ....

Further advantages and details of the invention emerge from the description of FIG. Exemplary embodiments -. based on the drawing. . "-... -"'_ - ■' -.

In this- show: ... ". .. ·....

■ Figure 1 in plan partially shows a telephone call answering

.-., .. ■ - ■. he word with a tape as memory;:; Figure 2 is a top view of the announcement tape and with this

cooperating parts. for "notification of the.: . - Caller that he is with an automatic Tele.fpn-

- answering calls speaks ;: -.,. _: . Figure 3 shows an electrical plan. des. (device;... Pijur 4 the sciialtplan a ^ r.

iiaeh Pi ^ r 3; _; . . . · ■■ · .- ■.: .- '. ^: Fi.jur 5 an optional: electrical, circuit .. to. Actuate.

• of; . E ± -OJο ϊΐ-J:;: Relay, according to figure 3>"v / hen DLAs Abfrag.esign & l, - - ..-, and 6, a SeiialtplLUi the Zv, comes from a two-'Γοη-venerator.

ü-emass I ^ 'igtir t. the telephone answering machine instructs you. , Ton-bandä-e.rats.-Chassi.s -1. on which one, weighing reel 2. has fallen before ». Yon, aie.se.r-. Abv / i_ck el spule leads..ein llagnetband; .3 via a, Lös.ehko.pf β and a TZiedergäbe- .. or ... recording head 9 to. one. Take-up reel ... 83:, -. on-_ which: that. 3and is stored which records the incoming calls. "The, .Band- 3- runs- .äb.e..r; a wühr.iin- ^, 1 ο, _e , a ^ a ^ Jlonwelle,.; 4.4 and ,, a, contact belts 11;,. these three. components ... are. ^ between the liopf. 9- and the recording aoule: 83 , they.ordn.et ^. The T'.on shaft, .. 14 we4 from a spindle, formed .., _r welcjae, siclXi.in.-axial, Eichtung, - ...

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upwards from a flywheel, which is not shown, extends ,, the flywheel is located below the chassis and is driven via an intermediate wheel, not shown, by an electric motor 4, which is located below the Chassis is attached between coils 2 and ö3 »A Belt 13 transmits torque from a drive roller 14 'provided coaxially below the capstan to a non The slip clutch shown, through which the take-up reel 63 is driven in the known Veiae *

The guide 1o is normally at ground potential. The coils 2 and 83 are assigned brakes 5 and 6, respectively, and a spring 19 is located between multiple layers, which serves to keep the brakes in braking contact with the edges of the coils 2 and 83. The brakes are released by feeding a brake magnet 7 which is attached to the chassis between the two coils. As already explained above, the take-up reel 83 is driven by the motor 4 via the capstan roller 14 'and a slip clutch. The unwinding reel 2 can also be driven by the motor for rewinding the band 3, for which purpose a rewinding magnet 2o is supplied with voltage. This moves the coil 2 parallel to the axis against a stub shaft 4 'of the motor, so that the edge of the coil 2 is in friction engagement with this stub shaft 4' and is thus driven by it. When the magnet 2o is disconnected from the voltage, a spring (not shown) returns the coil 2 to the position shown in FIG. If calls are recorded on the audio tape 3 or are played back from this , then the tape is driven in that it is pressed by a pinch wheel 15 against the capstan 14 and thus carried along. The roller 15 is supported by a steering lever 16 which is operated in one direction by feeding a magnet and in the other direction by the action of a tension spring 18

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can be moved. The announcement of the answering machine to a caller, which takes place "before the incoming call is registered, is -from a tape loop 21 (see Figure 2) stored, which runs between two rollers 22 and. The tape 21 is driven by a drive roller 24, against which it is pressed by a second pressure roller. The drive roller 24 is on an intermediary a belt driven flywheel 26 attached, which -. in turn driven by a belt by the motor 27. A thickened one made of, for example, plastic place 28 is between, your end and the beginning of Belt 21 is provided and controls the operation of a microswitch 29, via v / 'elchen the belt leads after it an announcement head 3o was passed, which on the the loop 21 reads the saved announcement «

The electrical circuit for controlling the main parts of the call answering machine is shown in FIG. To simplify the illustration, some details which are not absolutely necessary to explain the operation of the device have been left out rules corresponding means are provided nloht. In addition, there is provided no means for switching off the call responder when the tape is finished or when it is torn "Furthermore, for simplicity, the contacts einzelnenRelais of both the turning on and off the supply voltage of the motors It is also used to switch the telephone. Such a measure might not be approved by the telephone company, but instead two separate relays could be used instead. Per code Miir loading

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The spelling of the corresponding relay contacts consists of a letter and a number. The letter indicates the operating mode of the Xcontact controlling the relay and the number indicates the number of the relay contact. All contacts are shown in the position which sis assume when the associated relay is not energized and those contacts which are normally closed are marked with black small triangles, while normally open. Contacts are indicated only with ^ a triangular outline. All transistors are denoted by the letter '4 ir.' Followed by a number.

The answering machine is provided with two terminals -31 and 32, between which the speech circle of the telephone lies.

The ringing pulses generated at the beginning of a call are fed to the primary winding of a transformer 36 via a capacitor 144 and a resistor 143. One side of the transformer secondary winding is connected via a rectifier 35 to a capacitor 34, which μ is charged by negative pulses allowed through by the rectifier 35. The positive pulses are blocked by the rectifier 35. The junction of the rectifier 35 and capacitor 34 is to the base of a transistor Q5o. connected which, when its base is brought to a predetermined negative voltage, conducts and feeds a relay A, which is between its collector and a terminal which is held at a potential of -12 YoIt. When relay A is supplied with electricity, it closes. Contact A under number 1, whereby a voltage of -12 YoIt coming from a connection 39 charges an electrolytic capacitor 37 via a resistor 38. The other side of the capacitor

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37 is thus held at a voltage of +4 volts the capacitor "steersable, charged through the resistor. 38 and creates a charge at the base ! Transistor QI. The 'Jransistö-r ^ 1 is in an Iransiotor chain ^ e switch τ, in which a -normc.lervvei.3-e lei-τ end he transistor Q7 and "a" connection relay B are provided is. The aitter of ^ 7 is grounded. .

The blade impulses from the secondary winding of the transformer. 36 are also given over a line 53 and a signal amplification and junction unit 54 ^to three transistors Q2, Q5 and ^ 4, the latter giving impulses from the blade in the conducting ones State is transferred and a charge can be accumulated on the capacitor 42, which is connected via a resistor 40 to the emitter of the transistor ^ 4. The capacitor 42 is geshuiitet by a Lond 43 and a case of the same is with the collector of the normally conductive transistor. Q.7 connected. -. . * _;

When on u-round the. charge accumulated on capacitor 37 the base of the transistor ^ 1. a. Potential, from -o, 2 ToIt reached, then the 'transistor Q1 conducts so strongly that the Link relay B is energized, which has 8 contacts and is used to connect the call handler to the telephone talk circuit connect to. Contact B1, which first makes contact and then drops out, goes into the other Switch position over and connects the base of the 'transistor Q1 with one side of the now charged capacitor The bias, at the base of transistor Q1,. v / elehe through the. Capacitor 42 is supplied, is sufficient to keep this conductive for - "" about "15 seconds even if j no further charging of the capacitor 42 takes place ο -

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The contact B 2 of the heater closes and thus closes the. Resistor 143 and capacitor 144 in short, which are in series with the primary winding of transformer 36 between terminals 31 and '32 so that between a pin connection is established between these two terminals.

Before the actuation of the relay B, the contact Bb has an electrolytic capacitor 44 at a voltage of -12 volts placed, v / which is removed from terminal 45 so that the actuation of the contact B6 a discharge circuit for the capacitor 44 produces and that via a response relay C and the closed Llikro he switches 29 to earth. The helix C * is thus excited and completes one Holding circle for himself by means of his own contact 01 and the Llemrne 45. ·

The contact B3 now changes its position around the switching connection to interrupt relay A from transformer 36 and at the same time to connect the secondary winding of the transformer 36 to a contact C3 of the response relay C, which in turn is erreated by actuating a contact Bo at this point in time.

Contacts B4 and G2 are actuated and close one AC power supply for the loop drive motor 27, which drives the announcement loop 21.

The contact B5 closes and thus forms the feed line to the brake magnet 7 »so that the brakes 5 and 6 come free from coils 2 and 83, respectively.

Contact B7 closes to complete a Holding circles for a relay H starting the tape.

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Of the. Contact B8 is actuated to complete a ' - ■' - '■ charge circuit for an electrolytic capacitor 47 ^: by connecting one side of the capacitor to a terminal 48 which is held at a potential of -12 volts.

As stated above, the announcement relay has C-following -Tasks: It closes a holding circle through its Contact 01, it connects the loop drive motor 27 with its power supply through contact 02 and it connects the secondary winding of the transformer 36 with an announcement amplifier 49 by actuation of the contact 03. Thus the signals taken from the reading head 3o are ■ loop 21 amplified in amplifier 49 and through the transformer 36 routed to the speech circuit of the telephone and thus made audible for the caller.

When the announcement on the announcement loop 21 is fully spoken then the plastic thickening runs out. 28 at the end of the announcement past microswitch 29 and actuates ■ this to interrupt the supply circuit of the Announcement relay C (see Figure 3) * The hold circuit of relay C the contact C1 is therefore interrupted and actuation of contact C2 disconnects the loop drive motor 27 from the power supply and instead connects the Drive motor 4 with the appropriate power supply. The third contact 03 goes into the other switch position and connects the secondary winding of transformer 36 with an automatic amplifier 51, which the speech signals amplifies the incoming announcement and feeds it to a recording amplifier 52, which in turn feeds the Sends signals to the recording head 9 on the chassis so that the incoming call is stored on the tape, when this passes the head 9. . *

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Bin voltage oscillator 4oo supplies voltage oscillations in "well-known 7 / ice to the head ^.

The various electrical signals transmitted through the circuit of the transformer 56 are also fed to the signal amplifier and rectifier unit via the line 53. This unit rectifies those electrical signals with simultaneous amplification, which are generated by the lingual impulses and speech, and transmits a series of negative impulses, which correspond to the signals, to the base of the transistor Q2. jüine corresponding number of positive pulses are of! collector of the transistor Q2 obtained and passed through two parallel channels, the first of which contains the Transistoran CJ 3 and Q4 and the continuous speaking is used and sized second transistor * ■ 'to V / eist and for turning off the answering machine serves, «tmi a continuous ion longer than 15 seconds is received, whereby such a! Eon can be the corresponding signal which is received when the caller has put the.

The positive pulses from transistor Q2 are applied to the base of transistor Q3 which is normally in a conductive state when no speech signals are received. The positive pulses applied to the base of transistor Q3 when speech signals are received drive it to shutdown with the result that each speech pulse creates a negative rise in the collector voltage of translator Q3 and thus at the base of transistor Q4 which the collector of transistor Q3 is connected. The emitter of transistor Q4 is connected to resistor 43 through resistor 4o and is normally in the closed state; will however

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goes into the conductive state when speech signals be received. In this way, every speech signal creates an increase in the negative voltage but the resistance 43 and thus the change in the charge of the capacitor 42) which is connected in parallel ". The capacitance of the capacitor 42 and the '/ rosse of the resistor 43 are chosen so that if for 15 seconds or more no Voice signals arrive, the capacitor 42 gradually is discharged mainly through the V / iders fcand 43 but also through the base-imifier connection of the transistor Q1. This causes the voltage on capacitor 42 to drop to one such a value that the 'transistor Q1 closes and then the valve is de-energized in a heater 3 for separation of the call-B answering machine from the phone.

The emitter of transistor Q5 of channel 2 is connected to a Voltage divider 57 connected, - which is held at about 3.5 volts,., and its collector is via a resistor 58 with connected to a terminal 59, which is maintained at -12 volts, iin electrolytic capacitor 56 is between the Emitter and the collector of transistor- Q5. i / enn from the Speech circuit no signals are received, then none are received positive pulses applied to the ^ base of transistor Q5 and this transistor thus remains in its normally conductive state, in which he short-circuits the capacitor 50. Yi'enn However, positive speech signals occur at the base of transistor Q5, then they cause the transistor to close with the result that the capacitor 56 across the Resistor 58 is loaded. This charging circuit is however interrupted every time the transistor Q5 conducts.

The values of the resistor 58 and the capacitor 56 are selected so that if a continuous tone of more than 15 is received by the answering machine, the

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Capacitor 56 charges to such a level that a transistor Q6, the base of which is connected to the junction of capacitor 56 and resistor 58 and which is normally held in a non-conductive state, is rendered conductive by the voltage at the junction. The emitter of transistor Q6 is connected through a resistor 6o to a bias voltage of -12 volts at terminal 61 and through a resistor 62 to the base of transistor Q7, which is in the conductive state. In this way, the line of the transistor Q6 decreases, the Λ negative bias to the base of transistor Q7 'whereby the latter in the non-conducting state and the power supply separated by the transistor Q1 to Eelais B. The heater B is de-energized and disconnects the answering machine from the telephone. From the description so far it can be seen that the connection and disconnection of the telephone answering machine with or from the telephone at the beginning and at the end of an announcement is controlled by relay B and that the calls received are successively stored on tape 3 while this is being done by the motor 4 ζγ / ischen the supply reel 2 and the Aufwieitelspule 83 is driven. The operation of the answering machine when queried by telephone is described below. "

The call answering device is equipped with one of the circuits according to FIG. 4 or S, which responds to the occurrence of a correct interrogation signal in the speech circuit of the telephone by temporarily pressing a code-responsive helper D (see FIG. 3). The heater D has a contact D1 which, when it closes, closes the -12 voltage exciter from a connection terminal 7o to a heater E which initiates the interrogation process, _{or the like}

When the Heiais E is in operation, a hold circuit is created for this ..

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Relay itself closed by contact E1 - so that when the heater D is de-energized, the heater E is kept in the operating position. Two further contacts E2 and E-3 are also closed to supply circuits for relays. F and 5 to sehlessen, which controls the rewinding of the reel 2 with the tape on it, on which the announcements were stored, and the switching of the connections ^: 'of the head 9 from the speech amplifier 52 to a gate amplifier for replay 72 ..; '■ "

The heat F has four contacts. The contact 11 opens to separate the pressure roller magnet 17 'so that the pressure shaft 15 is lifted from the capstan 14 by the spring 18 (see FIG. 1). The contact F2 closes to excite the rewinding magnet ~ 2o, - so that the coil 2 is connected to the motor 4 and rewinds the tape which is on the sink 83. The contact F5 closes a charging circuit for an electrolyte storage capacitor 73 and the contact F4 excites the motor 4 _f so that the coil 2 is turned back *

The relay G also has four contacts. The contact G-1 connects the output of the head 9 to the preamplifier 72 and at the same time separates the head from the speech amplifier 52. A second contact G-2 closes a volume control 74 formed by a potentiometer so that the played back announcements do not depend on the position The volume control 74 is normally set by the owner in a suitable manner for listening to messages played back via a loudspeaker 75 if the owner wants to listen to the messages ¹ in the usual manner. A third contact 83 y «? Connects the contact 03 with a play- back transformer 76, when the sole is closed. the one with the exit of an antyrortyerVt ^ lt «« '»77

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is connected, which in turn lies between the volume control 74 and the loudspeaker 75. The fourth contact QtA dea relay G- disconnects the loudspeaker 75 from the output dea replay amplifier 77 when it is opened <> The answering machine is now ready to replay the announcements from the tape as soon as the beginning of the tape is reached.

The beginning of the tape is through a strip of conductive Marked metal foil, which forms an electrical circuit between the contact post 11 and the guide 1o Q (see FIG. 1) closes before the replay head 9 achieved. As can be seen from FIG. 3, the closing process of this circuit closes a supply circuit for the Heiais H, which is provided with -three electrical contacts.

When the contact H1 is opened, the relay E initiating the inquiry is de-energized. "This de-energizes the winding-back relay P through the contact E2, so that the individual parts of the answering machine shown in the figure assume their return position." By actuating the contact F3, the charged capacitor 73 a brake loading λ relay will operate J closed, the contact J1 the loading ™ triebaweise of the brake magnet 7 controls. The relay J is briefly energized while the capacitor 73 discharges through the same and consequently the brake magnet is released and the brakes 5 and 6 are briefly applied to the coils 2 and 83. Similarly, the contact J1 controls the operation of the magnet 17 pressing the pressure roller. As soon as the relay J is de-energized, the contact J1 closes and the brake magnet 7 and the pressure roller magnet 17 are energized again.

By actuating the relay H, its contact H2

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closed, whereby for this there is a self-holding circle. to earth through the closed contact B7 _o By closing the contact H5, the contact E3 is shunted so that the de-excitation of the heat &, which was caused by the opening of the contact Hi, has no effect on the relay ^ Gr, whereby the head 9 remains in connection with the playback preamplifier 72. The contact H4 bilaet when closing an oil circuit to switch off the Yerbiuaungsrelais 3 'as soon as the Ilelsis D is operated again. . -

When the contact xH is closed and the Helaia C 'is de-energized, the drive motor 4 is driven and the tape runs past the head 9, which converts the calls recorded on the tape into electrical signals, which in turn are transmitted by the transformer 36 in e. en Spreehkreis of · telephone circle are transmitted, so that the caller can listen now those calls that were spoken on the tape before his interrogation. The waste 'play the recorded calls SiCN is continued until the head 9 on the ^l .sand the query code reading, which was originally initiated by actuation of the D Helais the query. * '"Reading the query code from the telephone line results,' although this time it is received from the tape, a repeated brief excitation of Heläis D so that his contact D2 closes and thus closes a grounded circuit, which is via the closed contact H4 leads to the base of transistor Q7. For this reason, Q7 becomes non-conductive and the power supply to relay B ceases, so that relay B is de-energized and disconnects the telephone answering machine from the line ^.:

Up to this point in time, relay B was energized and s.ein Contact B8 has a charging circuit for the capacitor 47 from Terminal 48 geachlosaen, so that when the relay is de-energized

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B switches over its contact B8 and connects the capacitor 47 via the rewind relay P, which in this way is excited for a short time by the discharging capacitor. The contact P2 closes and excites the rewinding magnet 2o and the contact P4 excites the motor 4 so that a length of the tape 3 corresponding to a talk time of about 5 seconds is wound back onto the reel 2 during this short period. Also during this period the contact P3 closes a charging circuit to the capacitor 73 »so that if the rewind relay P is de-energized at the end of this short period, the contact P3 switches and the capacitor 73 is discharged through the relay J to stop the coils. At the same time, the contact P4 opens to disconnect the drive motor 4 from the power supply.

If the relay B is de-energized, then the contact B7 breaks the hold circuit for the one responsible for the start of the tape Relay H, bo that contact H3 interrupts the hold circuit for relay G. Return contacts G1, G2, G3 and G4 thus back into their positions shown in Pigur 3, in which the head 9 again with the speech amplifier 52 and

connected to the bias oscillator 4oo and the call ([ The answering machine is now ready to record and save the next incoming call.

The 5 second excitation of the relay P takes place before dea? Call answering machine is switched off, regardless of what the cause of the switch-off is. Thus, if λ a caller unintentionally lifts the telephone receiver during the ■ yV. Hangs' recording an announcement or .the attendant K interrupts the "conversation", the dial tone and the telephone call responder takes the Wähltoa sounds in the Spreehleitung W. in memory before it switches off after 10 seconds,

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As a result, the opeicLer for z oekuxiden is wound back before the answering machine adjusts itself to pick up the call, \ ai'd Tom store so much of the r / 'äliltones deleted that only taelir so much Y / ählton it remains that with a subsequent play back, it is not possible to switch off. .

• The rewinding of the execution - for this short period after the code-responsive Helais D to the second shark has been pressed - ensures that when the next call is recorded it will be recorded before the interrogation signal previously on the tape, 'so that the interrogation · .signäl is from Jena, gelö.seht "thus, when but- maid a Aufrage takes place, then the calls that were aufgezeichnet- after the first query as well 'as depicted ^ ene, -which before. The first interrogation signal was recorded because the first interrogation signal was deleted.

It is still necessary to ensure that if the owner inadvertently hangs up the telephone receiver during the replay or if it is interrupted, the dial tone which then appears on the line does not actuate the helper B after 10 seconds, but releases the telephone line. By pressing .des relay B of the call versa responder in the "hold" Back at which it can receive a new call; -this: should-go midway of the back playing before, otherwise after detailed discussions over the previous , calls that have not yet been listened to by the owner would be saved,

pieses is achieved by switching the relay Gr with, two further contacts G-5 and G-6 '. Both contacts' Close when the relay G- is energized and the contact

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Qc ^ lies between a point of the bias voltage -12 volts and the connection of the positions 4o and 43. The contact Q-6 is connected between the i3a3is and the center of the transistor Q2. ·

The contact G-6 grounds the input of the base of the transistor Q2, so that the sound of the aci AUiTialiuekopf 9 passing tape has no influence traf- dia zvai channels, which have aen transistor Q5, the transistors Q2 and Q3 as well as the transistor Q4 . As a result, the transistor Q5 does not generate a signal which the transistor has .} 7 ixi the non-conductive state was carried out uua de-excites the Heiais B when a continuous tone of κι-ϊλγ c-ls 1 ^ - seconds duration is audible »

The contact ü-5 achliesut uia ensure that the capacitor 42 held in loaded Zu3tjn.de v / ird.

Now nothing happens anymore bi-i the original query sign from Jand back ^ sspicit and an aberrant tir- ! • egun ^ of the letter D results "Then the contact D2 briefly closes the! Aasis of the uransistor ^ 7 at xlrde t..n, which thereupon goes into the non-conducting state of affairs and interrupts the excitation of relay B. Lsr -ontakt BS returns to the otelluru shown in ϊί ;; ur 3 zur.ici-. -ina the iLondensator 47 is replaced by -Jk: a Helsif? eutlac-en to the short 5 second Itückwielceiuii ^ -u araöjlicheu, v, ^r elc * .ie is required before switching off. The contact υ7 opens to de- energize the Eelaia II and interrupts the circuit to relay G- via contact 113. This Ilelais & is de-energized and the circuit returns to the position shown in Pigur 3.

The relay Ä · can also have an additional contact

809803/0529

- 12 - ^:

^T .veIoher during the xlu-fnohKie eier iLliix ^ elimpulse closes, ura a ToTöpannmij of -12 YoIt to the connection of ^ ünderisatcr · '4-2 and ", / iueratarid 43 ^to ^ just ,, Di ο ~ guaranteed, deas, £ he will capacitor to the correct Sr axinung independent of demjeni.ieix dtroru jelaien 42, wherein the zvlinge by the 'Hransiator u »4 during OCE recording! impulse flieast wira -vvenn contact BT actuated.

In I ⁵¹ I ^ Ur 4 · a code section is shown for actuating the relay I) in response to the reception of signals, which the caller confirms with a whistle. Loyalty 112 er ^ eu ^ tv / earth and to which this ochaltun ^ an.jpric ^ t. The input for the connection is obtained from a terminal 99, including the amplifier 51 in FIG. 3 and the voice amplifier 52; from this (j-round the caller lie pipe should the query operate after ^1, the announcement of the Ielefonariruf-.Beantworters has passed, since otherwise the contact C5 is not in the position shown, in which the transformer 36 is connected to the control amplifier 51 .

At iigur 4, the input signal is passed through an iClectrolytic capacitor I00 to the "base of a" transistor .y.11. " The jüasis des iransistörs is provided with a bias resistance solder and the uransistor emitter is connected via a parallel circuit, which has a resistance 1o2 in one ana and in the other a circuitry matched in leg with a response frequency which corresponds to that of the whistle to which the answering machine responded to the query and this wide arm continues to have "e'iiie inductance 103 and a Kd« ci (in3ötor 1o4. 40 * 3 '-'-' on a patential / from -12'ToIIi gehaliseho ■ · _? ;; / <· ^ 'ic> .- r

OBIGiMAt

The signals from the amplifier are t> 1 that frequency have, to which the series confidence Bohaltunci responds, then they worked through the railing gate, 11 reinforced and the an ^ oilektor des Jruisistors ^ 11 received oijru- '. le Aver α en via a capacitor loS a detector circuit performs. The detector circuit has two metal rectifiers 1o7 and 1ob on. The rectifier bridged 1oö the positive impulses to the earth given by the rectifier 1o7 liiciit clurcli ^ Gl ^ cseu v / er α en, v / elcher in turn the negative Redirects impulses and adapts them to the ± 5asis of a wide- (J. ren transistor 312 sets. At the base of the transistor ^ 12 lio ^ t a pulse smoothing circuit, which is created by a capacitor 118 is formed, which is parallel to a resistor 1o'j «i; ornalerv; there is also transistor Q12 in li-icnt conductive state, however, one applied to its base negative signal brings it into the conductive state, so that its collector, via a resistor 11o the -12 volt Lsitun ^ is connected, becomes relatively positive and a corresponding bias is applied to the base of a normally conducting transistor Q13 via a tap between the V / id he stands 111 and 112. The transistor Q13 is normally kept conductive namely by a voltage applied to its base "and obtained from the chain of resistors 11o, 111 and 112 will. The emitter and collector of the transistor Q13 are connected to the opposite terminals, respectively a timer capacitor 114 and the collector is also. via a Y / resistor 115 to the -12 volt line and the base of another transistor Q14.

As long as the transistor Q13 conducts, it short- circuits the capacitor 114, so that the base of the transistor Q14 is kept at such a potential that it does not

WHEEL ORiGiHAL

809803/0329

Can conduct electricity. In this way it is in the collector circuit of the! transistor Q14 lying relay D not energized " If the transistor Q 1: 3 is brought into the non-conductive state, then the capacitor 114 becomes through the resistor 115 charged and when the base voltage of the transistor Q14 will then reach a fourth of -o, 2 ToIt j the transistor Q14 conducts and, the heater D is energized. -

During normal speech, notes or tones of such pitch will of course be heard periodically and relatively briefly to which the emitter circuit of the transistor Q.11 is tuned in resonance, so that the transistor Q15 is briefly in the non-conductive State is brought, but never for a long time that the capacitor 114 can charge to such a value that the transistor Q: 14 can in turn go into the conductive state. '. - '-

However, if the caller blows a whistle which is tuned to the resonant frequency of the resonant circuit of transistor Q11, then transistor Q12 will be kept conductive by the bias applied to its base and transistor Q13 will be non-conductive convicted. The value of the resistor 115 is of such a size that, if the caller's whistle lasts at least one second, the base of the transit gate 114 takes a voltage of -2 volts, so that the relay Ί) is actuated in order to actuate to effect the sequence of processes corresponding to the call * which were described above in connection ■ with Pigur 3 »

The circuit shown in Figure 4 can be modified accordingly that it has two or three amplifiers tuned to different frequencies so that the

'-' - -: BAD ORlGiNAL

T \ JI iww

-.25 -

Circuit can respond to a double or triple whistle tone, which for the purpose of dec- Abruf3s. Caller ^ bjs will .; Those üchaltun_ f ^enced the iieleis j can easily asüei ζ ^ ΐε: be ι, η ge specifies that dös Le la-is D just- betotigfcr i «t, v all three 'are perceived hair-driers. See there! ie ", aic'- ε-iüe large number of different l! oLfDiri.ationsmöbliülike tsii the i'o.'ihehe results, köimen for different xelefonanruf-i; e ^ ntv. ^r ortereine, large number of different combinations presented '.; er · derio v / if only a single eleven tone is used, "it is difficult to provide more than 15 codes ..

posture that responds as a pick-up to a two-tone source and thus the Ilelais D actuated, will be operated in the following described under Hinvreis on ligur 5 - "·

The code scanning circuit according to "iFi ^ ur-5 is set up in such a way that it only initiates the sequence of processes following the query if a first part of a tone code signal has the correct pitch has, v / hen clie enduring the first part of the code Signalea is correct and when the. second ¹ IEIL of Go & E signal also has the correct pitch Iiur VEIM all three of these conditions are true, then "actuates the sampling circuit, the relay D _e '"-

Speech signals from the control amplifier 51 (see Eigur "3) are fed to two channels tuned to frequencies via an electrolytic capacitor 2oo" The "" first channel v "has a transistor Q3o whose base is connected to the capacitor 2oo and its emitter via a resonant series circuit of an inductance and a capacitance is 2o1 2o2 consisting connected to a neutral line which does turn on S ζ punk t 2oJ located. ' The smitter is also connected via a resistor 2o4 to a support point 265, which is kept at a voltage of + ■ 4 YoIt. Of the

BATH 809803/0329

• VS / I '

The collector of transistor 3 25 is across a load resistor 2o6 with a "\ gate voltage of - 12 YoIt (base. 2o7) connected and also via an electrolytic capacitor

208 with zv / ei. Metal oil rectifiers 2o9 and 21 ο "These rectifiers are cterart. arx ^ arranges and does not switch that the positive voltage pulses .from rectifier 21 o toe .connection 2o5 S ^e ~ λ-conducts, and the negative. Impulse ", about the G-leichrielite-r .. -

209 for -iasis. a second transistor Q31 are conducted, The transistor Q31 is normally to be used for this purpose. in the non-conductive state. The liasis of the transistor Q 31 is provided with a ü-Lättuniäskoüdensator 211 and a "Breakdown resistance, 212 is parallel between the base of the. ilrtuisistors and aera connection 2o_>. . . -., · _. .

The iiOllelüüi ^{1 of} the transistor ^ 31 is via a.- Int'e ^ circuit, weluhe_ a. Tfiaerstand. 21-3. and- an electrolyte-; iionaensator 214, the connection of which Liit is connected to a further V / resistor .215, to the base of another. ■ transistor. ^. -32 yeroynden, welc-h-ar sich, iicrmalerweia.e in. ■ Ieitenäeia.Stand is. The output signal from the transistor. ^ 32. Is from _; the positive 3eic, e of his EollektOr-i3elastunde-, resistance 216 received and over-a, differentiating - .. ,. ύ c ha 11 ung -, we 1 chee inen · -Eo nd er. sa t ο r 21 yrs and a w e r st and.. 21G sufvveist, .. to a metal rectifier 219, · whose * anode is connected to the ^ base of the transistor base ... Q · 33 ".. -... \

Of the. Trt-iasistor Q33 is located: normally in. not last. State and forms one half of a -ί ^ ο ^, ο stable ItIaI ti vi> -. . bratorkreisss; iiiit- a iransiator Q34 "The", transistors ^M33:;.. and H5a 'are at their emitters to one .gemeinsamen ,: uelastun ^ n vviders.taiid 22o. "e'ö.ls ^ t. and their .-. iioilekturen. are, by- zv / ei .. '. .. JSlektrclytköiideiisa.toren '221 connected- ,. Which; contradicts ^ it ·; _ώ · ερο, ΐΈ .. are.?- .The ·. Collector ... of the transistor Q33 is connected by means of · - .. :: .. a line 222 with deö. ζ many - ^ on frequencies responding

8 098Ö3 / O329 \ "* - -

! Canal connected.

The collector of the transistor Q32 is also connected via a V / ideratand 223 to the ~ ßvä.s of a ¹ Ai ¹ MnSi disturbance a ^ 33, the normalerv.eibe iia uicit conductive state and also a I. collector jelastun ^ aY / resistance 224 has ο the junction of the transistor 33 is fed back to the base of the transistor 32 via a capacitor 225 ura to form a positive feedback loop in this way. , äk

This channel described so far can send signals that open a gate circuit via line 222 to the second channel only send if the frequency and duration of the incoming first tone of the query signals that V / er th Corresponds ^ to which this channel has been set. These Discrimination is achieved in the following ways

The signals received over the voice line of the telephone are applied to the base of the transistor Q3o, which is a tuned amplifier because it has a series resonance circuit formed by the inductance 2ol and the capacitance 2o2 in its emitter circuit * When a tone % is received , which has the frequency to which this resonant circuit responds by having a minimum impedance for that frequency, then this tone is selectively amplified by the transistor Q3o. The amplified tone is picked up by the collector of the transistor and fed to a detector circuit via the capacitor 2o8, / which is indicated by the two metal rectifiers 2o9 and 21 ο call. The rectifier 2o9 transmits the negative :. Iu .ulse of the voltage to the base of aes transistor Q31 and Ä u ^ calibrator 21 ο conducts the positive pulses of the ^{voltage icf} to the + 4 Folt-Leittmg · The negative pulses applied to the base of the transistor Q 31 are

809803/0329

smoothed by the capacitor 2.11 and the resistor 212. ¹

The transistor q -31 is normally not conductive, but responds to an increased negative bias voltage at its base, which is generated when a tone is received by the fact that it is overheated into the conductive state This causes the voltage across the resistor 213 and the capacitor 214 to drop, so that the capacitor discharges at a rate determined by its capacitance and the value of the resistor 213.

When the loiidensator 214 'discharges, then' a 'becomes steep; applied positive bias. the base of the transistor 4 $ 2 _ is placed, which is in a normally conductive state. The increasing bias applied to the base reduces the iütr.oia through the transistor. QS2 until it is possibly converted to the non-conductive state.

The outputs are obtained from the collector of transistor Q32. The first output variable will be given via the resistor 223 to the base of the transistor Q35 ^^ gs-which is normally not conductive. When the collector voltage of the transistor Q 32 reaches a predetermined negative value, the transistor Q35 goes into the conductive state and at its collector is through the. The voltage drop across the resistor 224 generates a correspondingly increased voltage. The collector of the transistor Q35 is fed back to the base of the transistor Q 32 via the capacitor 225. to increase the associated positive voltage, so that the switching circuit formed by the two transistors Q32 and .Q35 suddenly becomes an · oscillating circuit ^: when the transistor Q3? 5 · i.-.__ conducts * · "■ _- ■ '. '■'" _: -. ; -., - C :. .: '.. "..''" ■ "' -

The second output from the 'collector of the translator will be C02

80 980 3/0329

via the differentiating circuit, which is powered by a capacitor 217 and a resistor 218 is formed so that when the transistors fall into Bchwingzustand ^ 32, and Q35, the vibrations _r are passed through the resonant circuit formed by the capacitor 217 -and the resistor 218 are fed to the rectifier 219, which only conducts the negative peaks and gives them as a bias voltage to the base of transistor Q33 of the monostable cultivibrator to trigger it .. χ

Transistor Q33 is normally in the non-conductive state and transistor Q34 is normally on. At a point in time determined by the capacitor 214 and the V / resistor 213, the bias voltage at the liasis of the transistor Q33 becomes negative and the transistor becomes conductive, so that its collector voltage becomes positive and the transistor Q34 is brought into the non-conductive state. The multivibrator is monostable and its!. Omponents are selected so that when brought to its second state, it will remain, and this for a period of only one second then to the first state passes over Iu which the transistor Q33 is not conducting * The transition to its first state * generates a negative pulse, the αι .: collector of the transistor 433 occursj this pulse is passed through the line 222 to the 'wide channel, so that it closes ^{a "gate circuit! 1....,} .... ■.

In summary, can say about the, first channel that a pulse to open a gate circuit to a previous ■ The right time is generated after a hair dryer that was previously set Frequency received vrarde and that he has a one Gate closing pulse generated one second later

The signals transmitted via the capacitor 2oo are.

BATH 809803/0329.

also to the 3as ± s of the frequency-selective amplifier-,! transistor ^ 35 rises., which .similarly geech & lte-t ϊ $ ΐ ns the amplifier, i'l: er-'Jr: ui8 ± stor ^ 30, -wherein j ' edooh. his ": - 23iitfeer- ■" ■ '"" oarieii-IieBoiia-nzkreiö 230j 231 on aine- higher other- frequency ü.j ^ ec-tlniQifc, is. Of course, it also 1st IIIo ^ Lich Iiierfür low I ^r requency provided. Thus the I-on, "" richer the Yerätärker - transistor Q33 ^ has no V / irIun _& · on the Terbtüi'kc-r-xrciusjistcr - ^ 35 »v / tlclie iiur Atf the second tone aiiopricht. - ■

The YOffi. ivOllc-ktör aes. iüransistors ^ 35- reinforced "is on then a ^ or-i'raneiatpra QJo .zugeführt, v / elciier normally passes the collector and sotait a short-circuit""'. xär circular ä.exi reinforced .zweiten tone until it forms by a negative 3-a ting-impulse not conductive, right v / ira, which is over the line 222 to its base. ge icnjt ... the. jiiäitt-ür ueü- -for -! 'ranaiutcrs -436 is connected to a neutral line 232 by a liel -ücüaIriuy, which is connected by a Zener diode 233 and an Ülejctrölyt-iLO-ndenDator. " 234 is formed * · ■■ '"- .. _

The transistor Q36 conducts ilornialerv / eise and forms a short-circuit path for signals, which at the collector of the Sraii-. . _: sistors ^ 35 are generated. When a "positive" impulse opens on line 222 and the iransistor 33 becomes conductive, transistor 36 is brought beyond its closed state and thus closes the course "from the collector of transistor 35 ¹ ^ g.

If the correct second tone is received at this point v; ird, it is selectively activated by the tuned! transistor vi35 amplified and the amplified signals are transmitted through a. .

Block capacitor 235 two detector rectifiers 236 and that work in a similar manner as the equalizers

8098Ö3 / Ö329

ι to / too

2o9 and 21o, they only allow negative impulses Base of the! Transistor Q37, which normally is in a non-conductive state. Mn smoothing and tensioning circuit, that of a capacitor 238 and a 7 / ideratand is formed, keeps the isasis of transistor '437 at a acceptable negative voltage so that transistor y37 is kept in the conductive state and the Heiais I) in Ksineni Lollektorkreia pressed either "up over the line 222 to the .Base of the! Transistor ^ 36 a gate circuit opening impulse is applied or until the wide tone is switched off, whichever is shorter. The gate circuit The final pulse, which is negative, causes transistor Q36 to be in its normal conducting state to overlook.

The function of the Zener diode 233 is to rush out that the voltage of the collector line of the transistor -436 remains exactly constant if an Ißrouls is received via the line 222, if the Zener diode is not provided, then If an impulse arrives at the collector of the transistor ^ 36, the voltage increase would result in the fact that the base of the transistor; <t37 would be biased to a fc'cloiien V / ert, so that the transistor ^ 37 would conduct and thus wrongly the heat The rain"

In line with transistor Q37, a transistor Q38 reads which prevents the relay D from being energized when the two tones are tuned to rich the two channels, simultaneously received v / earth, -

The collector of the transistor a *, * J is in series with the emitter of the transistor «437 and the base is with a Contain resistance chain. '. the resistors 25o, 251 and connected, which in turn in the IC collector circuit of the transistor

809803/0323

Q3-1. Due to the presence of the first tone, the potential at the base of the transistor Q38 is positive during the periods "in which the transistor Q31 conducts so strongly that it is held" beyond becoming non-conductive "" When If the second tone is received at the same time as the first tone, no current actually flows through transistor Q37, although wr is in its conductive state, because transistor Q38 is kept in the non-conductive state second tone is \ audible, then transistor Q31nicht becomes conductive and its collector voltage becomes negative. the base of transistor Q38 is then even more negative, so that the transistor conducts current when the transistor Q37 becomes conductive and the relay D is. then actuated.

A suitable two-tone audio generator to start up the circuit according to FIG. 5 is shown in FIG. He is arranged in a rectangular case of such size, that it can be carried in your pocket and has one On / off switch 3oo and a small loudspeaker 3o1. The generator is powered by a small battery. provides a neutral voltage at connection 3o2, a Voltage of + 4 volts at connection 3o7 and a voltage of - 7 volts generated at connection 3o4.

The generator uses a first free-running multivibrator, / formed by two transistors Q41 and Q42 to provide a first tone and a second; freisehwingehiegen Multivibrator made up of two transistors .Q44 - and -Q45 to deliver the second tone · is formed. A normslerweiae-not Conducting transistor Q47 prevents an operation of the second multivibrator until the eyete MultivibJiAtor has been in operation for a predetermined time * This «'predetermined time is determined by a time cycle that"

809803/0329

a capacitor to be charged through a resistor 3oo having.

.When turning on the G-enerators "begins to oscillate the first multivibrator and its output signal is sent from the collector of the transistor Q41 to the Baal of the transistor .Ho _f which as Jiiaitter- ^ is connected olger to impart high Eingangaimpedanz to the! multivibrator In this way, the operation of the loudspeaker, which is connected in such a way that it is operated via the jitnitter of transistor Q4o, cannot "pull" the first multivibrator into a different frequency.

Above the transistor Q42 of the first cultivibrator is a 'Transistor Q43 switched, which is in a non-conductive state is held until its' JaSiG a predetermined negative Voltage assumes * The duration of the time in which the 'Tranaistor Q43 is kept in the non-conductive state, is,, is determined by the length of time which the capacitor 3o5 needs to reach a predetermined value via the Y / resistance 3o6 negative voltage to be charged, when this voltage is reached, then the transistor 343 is conductive and thus short-circuits the transistor Q42 so that the first multivibrator is switched off,

Almost at the same time as the first multivibrator is switched off, the connection between the Y / resistor 3o6 is reached and the capacitor 3o5 has such a high value that it has the Transistor Q47 can conduct, so that the second freely oscillating Multivibrator powered by transistors u44 and Q45 is formed, breaks out in vibrations and "with a different and higher frequency than the 'natural frequency of the first multivibrator ο The output variable from second multivibrator is taken from the collector of transistor Q45

. BATH

809803/0329

taken through a transistor W46, which =; - like the transistor Q4ö -. connected as emitter follower 'and the loudspeaker 3o1 activated »- -": ·

The second multivibrator remains in the oscillation state until the switch 300 is switched off, so that the operator has an audible signal that the switch is in the "on" position. When the switch. 5oo is switched off - * - switched off ', then a contact short-circuits the capacitor 3o5 so that the two-tone generator can be switched on again immediately: without the risk of the capacitor 3o5 being partially charged and the previously determined The flexibility of the first multivibrator could change. V;. ■ -. -

Be the use of the ^; He will use a two-tone generator; his Ijautsprecher 3.al: to the Üundst ^: iek, ie the microphone of the telephone receiver held and switched on when the announcement text of the telephone answering machine is finished. Has Venn G-enerator in its second 'J) ο η switched, it can ground \ shut v ^, because the Oode scanning circuit has now been found according to Figure 7 that the frequencies of the two tones are correct and that also the Duration of the 'first tone correct' is a The circuit has then actuated the relay D in order to carry out the switching processes for querying,

When using a tone generator with two or more tones can handle a very large number of encrypted interrogation signals can be generated by additionally changing the pitch, or changed their durations “This makes it possible that "each Teleforlänruf-jieanter of only one ' Combination · of "'blow dry or tone duration" can be queried.'

-BÄÖ ORlBiK

809803/0329

Claims (4)

a-t.e η t an s ρ r α c h e x'elefoiianruf-jjeantworter lit for connection "a telephone, welcntr v / aiireiiä d ^ r ^ i ^ absence of the agent incoming call e _x .oiciiert uua this de ία iii IIER _o" - "at the appropriate check-raf L uf on send & ^ e ^ e durcn the can, a Öpeieher for the incoming en viesprllche means zui.u playing back and ¹ ^ ieder-3'el) en üiit of calls from memory and a device, which in Deia right Abfrage_x ^ nal of the signers ^ eoped calls by ^ ibt, characterized in that query discriminator öchaltun ^ toif a certain -Frequency is matched and the. to play the. only switching operations that have been saved when the audio frequency signal on the phone's input line lasts for at least a second «. 2. call answering machine according to claim 1, characterized in that that a portable whistle is used to generate the audio frequency is used. 3. call answering machine according to claim 1, characterized in that that associated with the frequency sensitive circuit ■ Interruptively responsive to times - the time must be measured can, during which the audio frequency is maintained and that the answering machine can only pass through the stored calls if this period is equal of a predetermined duration. 4. call answering machine according to claim 3 »characterized in that that two frequency responsive circuits in corresponding Channels are provided, the first channel being on a first audio frequency over the telephone line 80 980 3/0 32 9 • responds and opens the second channel, which in turn responds to a second audio signal of different frequency and then the playback of the stored G-es calls introduces «. ■ 5. Answering machine according to Claim 4, characterized in that that the first channel controls the operation of a gate circuit at the input to the second channel and the gate circuit opens for a short time only at the end of the period so that the second audio frequency can get into the second channel and initiate playback of the saved calls can. . . ' 6. Call answering machine · according to claim 4 or 5 »characterized in that that a battery-powered two-tone G-enerator is used to generate the two audio frequencies will. -. ■ - 7. answering machine according to claim β, characterized in that that the tone generator 2 at different frequencies' . vibrating MuI tivibratoreii on v / eist and a timer circuit, which after a certain period of time switches one LiuI vibrator on and the other off. 8. answering machine according to one or more of the preceding claims, characterized in that the circuit for handling the processes following the query responds to the query signal · from the memory to end the query sequence by disconnecting the answering machine ■ from the phone and thereby the Turns the memory back by a few seconds so that the next incoming call after the query clears the stored query signal »-. . ' ■ ;; ■■ 'BAD ORIGINAL 8 0 9803/0329 - IHO / 9. Call-üeaiatwor tar iiaoli a olar n ^ lii'eren of the before 3ehex.deiiAu3pru.0h ':, thereby jaki ^ ns jicJinet that :: or auc - aineai l ^ aj ^ -itbaad exists. BUILDING 809803/0329 4th