DE3118420A1 - CALL RESPONSE WITH SEMICONDUCTOR MEMORY - Google Patents

Description

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H.-D.Knauer - H.Ludwig 50-2
Answering machine with semiconductor memory

The invention relates to an answering machine with a semiconductor memory, as described in the preamble of claim 1.

Commercially available answering machines mostly use tape devices to record voice information, which also include the Messages from a calling party can be recorded on compact cassettes. These known devices have the disadvantage that high maintenance is required due to the large number of mechanically moving parts. Also need the tape devices have an electric drive that requires a lot of energy. In the magazine NTZ, Volume 32, 1979, Issue 7, Page 468, it is stated that a read-only memory is used in an answering machine to store message messages can be. In the case of the answering machine presented there, however, a caller can record messages The participant continues to use a tape device. The disadvantages mentioned - high energy consumption, high maintenance costs thus not avoided with the answering machine presented there.

The technical task of the answering machine according to the invention consists in both message text announcements and messages to save the calling subscriber and transfer it to the caller or the listening, called subscriber.

ZT / P1-V1 / B1

04/28/81 /

H.-D.Knauer - H.Ludwig 50-2

The solution to this problem is provided by the patent claim 1 indicated means reached.

Advantageous further developments of the invention are set out in the subclaims marked.

The invention is explained below with reference to the drawing, which is essentially a subscriber terminal with a Exemplary embodiment for an answering machine according to the invention shows.

The subscriber terminal FeApAB contains not shown in detail known devices of a telephone set FeAp for digital message transmission to a central exchange ZVST. The FeAp telephone set from a speech capsule Sk supplied analog voice signals by means of an analog-digital converter (not shown) im FeAp telephone set converted into PCM-coded digital signals. In the opposite direction, PCM encoded become digital Signals that are transmitted from the central exchange ZVST to the telephone set FeAp, by means of a not shown digital-to-analog converter converted into analog signals, which-are then fed to an earpiece HK.

The answering machine AB assigned to the telephone set FeAP consists essentially of an analog-to-digital converter AD1, a digital-to-analog converter AD2, a central control unit CPU, a recognition device E and two semiconductor memories SP1, SP2.

H.-D.Knauer - H.Ludwig 50-2

For writing an outgoing message in the designated semiconductor memory Sp1, the transmitter capsule SK by depressing a l _'ON button is connected to an input of the analog-Ditigalwandlers AD1 connected. The signal digitized in the analog-digital converter AD1 is fed to an input b of the control unit CPU. The digitized announcement text is then written into the semiconductor memory Sp1 via the control unit CPU. To play back and check the written announcement text, a play _{key T w is brought} into the other position, not shown here, and a key T _{WA (SJ is} pressed at the same time. By pressing the key T _WAN , the control unit CPU is informed via its input c that the stored announcement text is to be played back The playback then takes place via the digital-to-analog converter AD2 and via the earpiece HK.

If, when checking the announcement text, it is found that a wrong or faulty announcement text has been entered, this text can be deleted. For this purpose, a delete key T, «and the key Τ · _{Ν are} pressed. By pressing the two mentioned keys at the same time, the central control unit CPU receives signals at its two inputs b and d, by means of which the deletion process is initiated with regard to the entire announcement text. A new greeting can then be saved.

The stored announcement text is communicated to a calling subscriber aT when the called subscriber is on the telephone FeAp is temporarily unavailable. This state that the subscriber on the telephone FeAp temporarily is not reachable, the central control unit CPU through

H.-D.Knauer - H.Ludwig 50-

communicated a button, not shown here. If a ringing tone is then sent to the FeAp telephone set, then A corresponding signal is supplied from the recognition device E to the input e of the control unit CPU. The control unit CPU then brings one contact into the other, here Position not shown, so that the announcement text from the semiconductor memory Sp1 to the calling party via the control unit CPU Participant aT is transferred. For this purpose, the control unit CPU is connected to the semiconductor memory Sp1 and their output a is connected to the digital-to-analog converter AD2.

It is provided that the calling subscriber aT a message can leave behind, which is stored in the example in the semiconductor memory Sp2. To such a notice To be able to save, one contact K ^ becomes the other, here Position not shown brought. The message from the calling party aT then arrives via the telephone set FeAp, via the contact Kg, via the analog-digital converter AD1 to the input b of the central control unit CPU. This writes the digitized message in the semiconductor memory Sp2 a.

By pressing the playback _{key T w} , the messages stored in the semiconductor memory Sp2 can later be queried by the called subscriber.

By pressing the two keys T, q, T ^ ₁ at the same time, the messages stored in the semiconductor memory Sp2 can be deleted.

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H.-U.Knauer - H.Ludwig 50-2

The two semiconductor memories Sp1 and Sp2 are memories which are suitable for receiving the signals digitized by the analog-digital converter AD1. In order to save storage space, a delta modulation preferably takes place in the analog-digital converter AD1. The two semiconductor memories Sp1, Sp2 can have different storage capacities. Thus, the semiconductor memory Sp1 can have a storage capacity of 256 KBit, the semiconductor memory Sp2 a storage capacity of 1 to 8 MBit. The semiconductor memory Sp1 can then record an announcement text of approx. 15 seconds duration, the semiconductor memory Sp2 messages of approx. 1 to 8 minutes duration in total. The end of the storage capacity (announcement duration or message duration) can be indicated by an acoustic or visual signal. At the same time, the Τ · _Ν , Τ ™ and Kg buttons can be triggered automatically at the end of the intended announcement, listening or message duration.

There is also the option of using a central answering machine in the ZAB to record digitized information central exchange ZVST to be provided. This central answering machine ZAB contains a large memory, the one Has a large number of storage locations which, if necessary, are occupied by participants. these-be assigned. With sufficient In the central exchange, acceptance becomes a subscriber-specific storage space for each subscriber intended. By dialing a certain code, each subscriber receives one in the central exchange ZVST located control S Access to the central answering machine ZAB. Saving, reading and deleting the text is done by dialing special code numbers.

H.-U.Knauer - H.Ludwig 50-2

With such a central answering machine ZAB, too, it is advantageous to digitize the analog signals by means of memory-saving delta modulation. In analog telephone networks in connection with analog subscriber terminals, the digitization can be carried out in the central answering machine ZAB, as described above for a subscriber terminal FeApAB. If the central answering machine ZAB is connected to a digital subscriber terminal in a digital telephone network, the delta modulation can already be carried out at the subscriber. In this case, the subscriber-semiconductor memory Sp1 shown in the drawing, the SP2 T. _N key can in answering machine ".ter AB'entfallen. By selecting the central answering machine ZAB and pressures is a connection to the central answering machine ZAB, wherein the delta modulation In this connection, the delta-modulated signals from input b of the central control unit CPU to output f, from where they are transmitted to the central answering machine ZAB via the recognition device E. A corresponding transmission from the central answering machine takes place in the opposite direction ZAB of read-out messages via input e of the central control unit CPU to output a via the digital-analog converter AD2 and via the playback button T _w to the earpiece HK *

A calling subscriber * ftT will be on € around a number plate about the temporary unavailability of the subscriber on the telephone set FeAp on the central answering machine ZAB reversed.

BATH ORIGINAL

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H.-U.Knauer - H.Ludwig 50-2

As memory modules in the subscriber terminal FeApAB included answering machine AB preferably used magnetic bubble memory. These can also be used with central answering machine ZAB can be used, but the use of a disk storage device can also be useful there, because the central answering machine ZAB has a much larger memory requirement.

It should be noted that between the digital telephone set FeAp with answering machine AB and other, remote digital facilities, for example another decentralized answering machine at the calling subscriber aT a direct data exchange, ie. a data exchange without analog-to-digital conversion can be done. The data exchange takes place via the recognition device E and the central control unit CPU between one of the semiconductor memories Sp1, Sp2 and corresponding memories on the opposite side. A suitable one Signaling that is recognized in the recognition device E initiates such a direct data exchange, the is controlled by the central control unit CPU.

RAH

Claims (9)

STANDARD ELECTRICS LORENZ
Aktiengesellschaft
STUTTGART H.-D.Knauer - H.Ludwig 50-2 Claims Answering machine with a semiconductor memory for announcement texts, in which the announcement texts with the help of a control unit are digitally stored and read out, characterized in that messages from a calling subscriber to be stored are also stored are stored as digital signals in the semiconductor memory (Sp2) that incoming analog signals for the purpose of storage by means of an analog-to-digital converter (AD1) are converted into digital signals that the control unit (CPU) all digital signals writes into the semiconductor memory (Sp2) and reads from it that the control unit (CPU) is reversing the direction between the playback of the announcement text and the recording of the digitized message, and that the control unit (CPU) the digital signals read out from the semiconductor memory when fed into an analog telephone network conducts a digital-to-analog converter (AD2). ZT / P1-V1 / B1 04/28/81 / H.-D.Knauer - H.Ludwig 50-2 2. Answering machine according to claim 1, characterized in that for the announcement texts and for the message of a calling subscriber separate semiconductor memories (Sp1, Sp2) of different storage capacities are provided. 3. Answering machine according to claim 1 or 2, characterized in that the Conversion into digital signals takes place by means of delta modulation or another memory-saving process. 4. Answering machine according to one of claims 1 to 3, characterized in that the Semiconductor memories (Sp1, SpZ) are magnetic bubble memories. 5. Answering machine according to one of claims 1 to 4, characterized in that it is part of a subscriber end device (FeApAB) as a subscriber-specific answering machine (AB), and that the writing and reading operations in the semiconductor memories (Sp1, Sp2) on the part of the subscriber of the respective Subscriber terminal equipment can be controlled directly by pressing the function keys provided for this purpose (Τ · _Ν , T ^) on the subscriber terminal equipment (FeApAB). 6. Answering machine according to one of claims 1 to 4, characterized in that it as a central answering machine (ZAB) is part of a central exchange, since & the semiconductor memory have a large number of memory locations that are occupied by participants or assigned to them if necessary, that a BATH ORIGINAL H.-D.Knauer - H.Ludwig 50- such participants address their storage space by dialing code numbers and by dialing code numbers on his telephone set (FeAp) controls the writing and reading processes in the semiconductor memories. 7. Answering machine according to claim 5 or 6, characterized in that a calling subscriber (aT) write and read processes with regard to his messages in a central answering machine (ZAB) or in a remote answering machine (AB) of a called subscriber terminal (FeApAB) by choice controls by key figures. 8. Answering machine according to claim 5 and 6, characterized in that in a digital telephone network, a direct exchange of digitized announcement texts and messages between an answering machine (AB) a subscriber terminal (FeApAB) and a central answering machine (ZAB) takes place. 9. Answering machine according to one of claims 1 to 8, characterized in that the End of the available storage capacity for announcement texts or for messages to be saved by a certain? signal announced and by an acoustic or visual signal on the telephone set of an announcement text or a message the subscriber to be saved is displayed.