DE3034288A1 - Telephone answering machine - has magnetic bubble store and uses delta modulated stored signal under microcomputer control - Google Patents

Abstract

Telephone answering machine with the reply transmitted from an integrated store where it is held in binary form. A programmable read only magnetic bubble store holds a delta modulated signal and the store is scanned as a rate laser than 40KH, at most 8 times and at least twice the speech frequency used. Write-in and reach-out of the magnetic bubble store (BM) is controlled by a microcomputer (8048) and clock generator (CL). The microcomputer (8048) comprises counters (CT) responding to the cyclical store scan pulse (TC) and a comparator (CP) to verify the count value. An output bistable (L) and function generator (PC) combine at a gate (CI) into the store (BM).

Description

Telephone answering machine and application of the same.

(Addition to P 3024688.9 = 5EPA 80 P 6087 DE) The invention relates to a further development of a variant described in the main application / main patent of the telephone answering machine, namely a further development of a telephone answering machine for sending from on an integrated memory in formed by binary signals Pulse modulation recorded responses, whereby - the sound carrier is a programmable tiur read memory, namely a magnetic bubble memory, which is the answer in delta modulation stores, and - the rotating field frequency of the magnetic bubble accumulator is less than 40 kHz and at most eight times and at least twice the upper frequency of the response voice frequency band.

The older telephone answering machine already works, like the invention the advantage of being so small that it can even be used in the associated telephone set instead of - as has usually been the case up to now - mounted in a separate additional housing - a high storage capacity without a complex mechanical, to offer a relatively shock-sensitive structure, especially with - on top of that against Sensitive to speed fluctuations - magnetic disks and magnetic tapes as sound carriers is necessary, and thus a sufficient duration of the answer for many cases with a high one To provide voice quality as required and insensitive to interference, - one against errors due to aging (e.g. due to scratches, dust and material changes) largely insensitive structure also for inherently unfavorable operating conditions (e.g. in damp rooms, under tropical conditions and with air pollution) without to allow considerable extra expense, - because of the pulse modulation that uses binary signals, relatively insensitive to disturbances influencing the signal amplitudes, for example - in the event of a power failure, the recorded response continues unchanged to store, so no continuous power supply is required for storage Power failure not to lose an additionally saved message from the caller, - to delete the answer as often as required by electrical means and through to replace other answers, - the magnetic bubble memory as a sound carrier with special to operate low voltages on the coils generating the rotating field, which is additional in particular the dimensioning of the amplifiers generating the rotating field coil currents, which can also be formed by a switching transistor, facilitates - that with Delta modulation Responses recorded on the sound carrier contain binary signals, which are easy to read and reinforce with little disruption - one is sufficient for many cases good voice quality is already possible when the delta-modulated binary signal repetition frequency about three to four and a half times the upper limit frequency of the voice frequency band is, even if, as tests have shown, for some reason up to about 15 56 of these binary signals are disturbed by these 15, ° S of the binary signals being held than a? 1? as a "zero", or instead of a "zero" as a "1" from the sound carrier read so that it is also possible --- defective secondary loops the magnetic bubble memory to record the answer - and the message too - to be able to use, because generally about 10% or 15, Q6 of the secondary loops of a magnetic bubble memory are replacement loops that are actually made by the S-markers are (only) intended to be used as a replacement for defective secondary loops, Magnetic bubble memory, which is used in many applications because of its too many flaws Memory loops are unusable, often even further in this training to be able to use, and --- an extension of the maximum possible response time to achieve in comparison to a magnetic bubble memory, its faulty Secondary loops are not used for recording at all, - the magnetic bubble memory with the same low rotating field frequency when charging and when transmitting, preferred to operate in the so-called multipage mode, which is known per se, which means that the blocks of the binary signals continuously with the selected rotating field frequency (from e.g. 16 kHz or 22 kHz) can be written, read and sent synchronously, whereby --- the hardware effort required per se at high rotating field frequencies, e.g. at 150 kHz for the intermediate storage of the binary signals in a buffer memory containing the convert these high, here 150 kHz, rotating field frequency read binary signals into a binary signal sequence converted back with the necessary low repetition frequency, here 16 kHz or 22 kHz, can be omitted, and - because of the generally only relatively small frequency band, which the calling party's speaker can handle, in general a low pass omitted to demodulate the delta-modulated response can be so that the magnetic bubble memory for a longer period even can directly control the speaker of the calling party; because of the Delta modulation is needed between the magnetic bubble memory and the loudspeaker of the calling subscriber usually no more decoder to be inserted because the usable frequency band of this loudspeaker is usually even considerably below the binary signal repetition rate of the recording, so that this speaker for itself already acts as a demodulating low-pass filter that this repetition frequency, so the carrier frequency, so to speak, largely sifts out.

The so-called adaptive one is particularly suitable for storing the answer Delta modulation, because with it almost always a similarly high voice quality as with PCM is achieved after demodulation even if that e.g.

10% to 15% of the binary signals of the modulated recording Faults in the magnetic bubble memory were lost or falsified by the telephone answering machine to the loudspeaker of the calling subscriber a "1" instead of a "0", or a "0" instead of an 8'1 "were sent.

The invention primarily relates to the control of the magnetic bubble accumulator by means of a microcomputer during the writing and sending of the response. Such controls have essentially been carried out with special control modules up to now and are in a variety of literature, especially the magnetic bubble memory manufacturer, described, see e.g.

- the compilation Pockwell Bubble Memories, RBM 256 et al., Rockwell Boarding school 1980, there in particular in the section "Data Sheets" --- Bubble Memory Devices and Modules (1978), --- D-RCM 650 (Aug. 1979), Document D-RBM REV. 3, Febr. 1980 and --- Document D-RLM 658 REV. 1 (Nov. 1979), as well as - 1979 Electro Conf. Record, New York 19./20. April 1977, Section 12/3, - Western Electric Eng. , April 1979, pp. 13-18; however, always for rotating field frequencies> 40 kHz.

These known controls already have those in the case of the invention given advantages, - the number of rotating field cycles in each of the different phases to reliably monitor the controller, - thus a loss of information and / cder avoid unintended delays in writing and reading by all bits to be written into the bits intended for their position in the bit sequence Storage locations written and, when reading, unnecessary, neither skipped nor repeated and - the timeliness of the respective initiation of the takeovers from the write path into the secondary loops and the transfers from the secondary loops to the read path to ensure.

In addition, the invention allows Lasus to be independent of special control modules a common, often very inexpensive, general-purpose microcomputer for controlling the magnetic bubble memory to apply - the microcomputer not only for controlling the often only during short periods Intervals operated magnetic bubble memory to apply, but, at least in the pauses between the controls of the magnetic bubble accumulator, in addition for arithmetic operations and / or to control other units; the microcomputer can then e.g. switching matrices or connection sets of the telecommunications switching system steer; In itself, the microcomputer can also be used universally for for the overall system with little effort on microcomputers; and the To relieve microcomputers of the time by only having comparatively low rotating field frequencies from e.g.

must generate approx. 20 kHz; the microcomputer is allowed to compare be slow and therefore requires comparatively little hardware expenditure for his reliable operation; a very fast microcomputer even has in the invention time for the control of further units during the magnetic bubble memory control.

All of these additional benefits are simultaneously due to the well-known Special control modules are not offered.

Microcomputers with counters / accumulators (including those with a timer - So with a special counter, the impulses that can be fed from the outside to the microcomputer counts and which is initially loaded with an adjustable output number and the then counts until it overflows, with an overflow signal during the overflow to a temporary toggle switch, which is often formed by a so-called flag is supplied, so that this flip-flop when reaching the overflow a can trigger a special group of signals or commands) are multiple in themselves known, see e.g. the INTEL microcomputers 8048 and 8748, as well as e.g. the additional modules 8021, 8253 and 8253-5 in - INTEL, MCS 48th Family of single chip microcomputers, User's Manual, Apr. 1979, especially pp. 2-21, 2-22, 2-26, 4-3 and 8-9 to 8-13.

The use of microcomputers to control garbage and equipment is well known, e.g. for controlling subscriber stations of telecommunication switching systems, in particular by - 4th Europ. Conf. on Electrotechnics EUROCOM '80, Stuttgart March 24-28, 1980, Preprints, pp. 199 to 201.

The additional advantages of the invention are mentioned in the introduction older telephone answering machine achieved that - the magnetic bubble memory when writing the reply and when sending the reply from one by one Clock generator clocked microcomputer for rough control of the magnetic bubble accumulator is controlled by means of various signal combinations as control signals, - the Microcomputer --- contains a program memory --- contains a counter which receives a counting pulse for each rotating field cycle and --- contains a comparator, the checks whether the counter reading of the counter corresponds to a comparison value, - the Microcomputer from the comparator if the comparison value and counter reading are equal resets the counter, a new comparison value from the program memory calls up, whereby the respective comparison value corresponds to the number of rotating field cycles, at the end of this, a different combination of signals than the previous magnetic bubble memory should control.

These additional advantages are thus achieved by means of a microcomputer, e.g. by means of one of the usual multipurpose microcomputers that have a counter and contains a comparator. It can also be specially designed to control the magnetic bubble memory developed, in essentially only usable as a control module Special microcomputers are used here.

The additional measures specified in the subclaims allow to achieve additional benefits.

Namely, it allows the measure according to claim 2, in the absence of any of the counter in the microcomputer as a separate unit, the accumulator register of the To use a microcomputer together with an intermediate register as a counter, as well as, in the absence of the comparator in the microcomputer as a separate unit, a storage register of the microcomputer, whose respectively loaded data is the comparison value represent, this storage register, in particular by means of the arithmetic-logical Unit (usually called ALU, which is known to be present in every microcomputer is), is operated in such a way that it works as a comparator, 3, by means of a special counter, In professional circles it is called a timer, especially for some of the common general-purpose microcomputers 7 to form the comparator by means of a flip-flop which responds as soon as the counter in question overflows - which makes the structure of the comparator special is simple, 4, for fine control of the magnetic bubble accumulator the timing for the Issue of the special control commands from the microcomputer to the magnetic bubble memory optimize, 5 that emit the control signals, e.g. those that control the rotating field coils, To relieve the outputs of the microcomputer in terms of time, in particular so that the microcomputer if necessary, can carry out further controls via this otherwise occupied output, 6, despite the then mostly particularly low reject rate in the production of magnetic bubble memory, all, including the defective, secondary loops including the replacement secondary loops for storage and thus the longest possible duration of the stored To make the answer particularly high for one and the same magnetic bubble accumulator, and 7, the same general purpose microcomputer not only to control the magnetic bubble memory, So not only to control the answering machine, but also to control others To apply facilities, e.g.

for controlling facilities of switching systems, in particular by installing the telephone answering machine in a subscriber station of a telephone switching system.

The invention and its developments are artand.

further explained by the embodiments shown in the figures, FIG. 1 schematically showing a subscriber station with a telephone answering machine shows, 2 to explain addressing options re.

which is used for secondary loop storage locations, 3 shows an exemplary embodiment 4 shows an embodiment of the fine control of the magnetic bubble accumulator shows, as well as 5 and 6 examples of timing diagrams of the coarse control of the magnetic bubble memory demonstrate.

First, here are some general properties of magnetic bubble memories compiled, preferably based on the one available for sale under the designation RDM 256 Rockwell memory with a maximum storage capacity of 289 050 bits before the invention is discussed.

The magnetic bubble memory module, also the module RBM 256, can usually deviate in three areas: 1st write path, 2nd memory area or secondary loops and 3rd reading path.

The magnetic bubbles in the write path correspond to the ones to be written Information generated serially. Is the write path consisting of a data block e.g. from 282 bits, filled, so this whole data block can be sent to the takeover organs, at the so-called "TRANSFER-IN positions", in the e.g. 282 different secondary loops' often also called sub-loops, memory loops or minor loops, all in one Cycle, namely a single bit per secondary loop.

The memory area consists e.g. of 282 secondary loops, of which however, e.g. up to 22 loops can be defective. Those broken loops usually have to insert zeros in the data block to be written correspond.

The length of each secondary loop, e.g. 1 025 positions per Secondary loop, corresponds to the total number of data blocks to be saved. at 1,025 positions of each secondary loop are a total of 260 bits in data block lengths 266 500 bits can be stored if there are 22 defective loops.

When reading, those in the secondary loops are given to special takeover organs, denTRANSFER-OUT positions ", standing 282 bits are taken over into the read path at the same time and can from there serially via detectors from the magnetic bubble memory module can be read out.

The magnetic bubbles are transported with the help of a magnetic one Rotating field, which is normally generated by two coils perpendicular to each other will.

The creation and transfer of the magnetic bubbles between the secondary loops and the write or read path are caused by strong local Mag: -iet fields, which are normally generated by special current loops, namely by means of externally supplied control signals, which are generally carried out by a specialist e.g. GENERATE, TRANSFER-IN, TRENSFER-OUT, REPLICATE.

When writing or reading the magnetic bubble memory, these control signals must normally in the context of the so-called coarse control, also called coarse timing, while very specific turning cycles and within these turning cycles normally during certain angular degrees of this cycle in the context of the so-called fine control, also fine Timing called - be forwarded.

The magnetic bubble memory can, for example, be operated in the so-called multipage mode that means that the data blocks of e.g. 282 bits, without a gap between the Blocks of data, written and read one after the other. It is often cheap to do this, between the physical and the logical addressing of a data block to distinguish.

With physical addressing, the storage locations are in the Secondary loops simply counted according to their spatial position, so that the physical Address of spatially adjacent storage locations on the secondary loop differs by the value 1.

In the secondary loop containing 1025 memory locations, for example, there are the physical addresses of these memory locations zero, one, two, three, etc. to 1024, cf.

the values of physical memory location addresses not in brackets in FIG some of these storage spaces in such a secondary loop. This figure 2 shows also a section of the writing path WL with the symbolically indicated takeover organ, about the in the secondary loop symbolized by an oval that bit to be written in can be transmitted through a TER-IN control signal. In addition, this figure 1 shows a section of the read path RL with its symbol look for the indicated takeover organ, via which a saved loop from the shown secondary loop Bit, here with the physical address zero, through a TRANSFER-OUT into the read path RL can be adopted. The direction of rotation caused by the created rotating field of the bits stored in the secondary loop is symbolized by a game. The physical addresses of the memory locations therefore have a chain-like sequence on the secondary loop.

In Figure 2, however, in addition to the physical addresses the associated logical addresses are shown in brackets, i.e. the physical address zero the logical address zero, and the physical address 282 the logical address one, etc.

is equivalent to. The logical address corresponds to the number of Bits per data block - again assuming in Figure 2 that the data block has As with the RBM 256 block mentioned, each has a total length of 282 bits. With the logical Addressing, the memory locations are addressed in the same order as the Data blocks are processed, that means how many data blocks are written the bit stored there before reading, i.e. before the start of the TRANSFER-OUT transfer, heard.

If, as in the RBM block there are 256, 1 025 storage locations in each of the secondary loops, the following relationship applies to converting the two addressing types: 282 logical address = 1 025.x + physical address, where x represents an integer. This gives the following conversion table for this example, see Fig. 2: Logical address Physical address 1 282 2 564 3846 4 13 5 385 6 667 7 949 8 26 9 488 77 123 461 124 743 Examples of the coarse control for reading with multipage mode are particularly shown in FIG. 5 and 6 shown.

In the example of reading shown in FIG. 5, during a Advance, which here lasts 85 rotating field cycles, in rotating field cycle 2, e.g. by means of the so-called

REPLICATE control signal non-destructive, 1 bit from each of the 282 secondary loops, each from the logical memory locations shown in FIG Zero, read at the same time into the read path RL, i.e. copied, see also the symbol for the magnetic bubble memory BM with write path WL and read path RL in Fig. 3. Im Stand reading path then in series accordingly the 282 bits there respectively.

Magnetic bubbles ready for reading, but only after the rotating field cycle 85, by wandering this serial data block on the read path via buffer locations to the detector, the first bit of this cached 282 bit data block from Block output is output to the outside as the first electrical binary character. The delivery of this first data block is ended after 282 rotating field cycles, whereby but already at rotating field cycle 199, by means of a next REPLICATE control signal, the bits originally stored in logical address 1, see FIGS have now been taken over into the RL reading path with the takeover body. Corresponding process control the reading of the second data block, see Fig. 5, and finally the penultimate one Data blocks, see FIG. 6 - FIG. 6 represents, so to speak, a continuation of the Fig. 5 shows. With rotating field cycle 199 during the delivery of the penultimate data block the last data block is transferred to the read path RL, which in turn starts with the The next rotating field cycle 1 is output as a signal sequence DO at the block output. During the delivery of this last data block, the takeover organs do not receive a REPLICATE control signal more, see Fig. 6. After the last rotating field cycle 282, it is true that further rotating field cycles, e.g. up to cycle 479, are fed to the block, in order to put the data blocks still stored in the secondary loops in good starting positions for a repetition of the entire reading process, i.e., without delay, to be able to read again from the beginning by the lead shown in FIG. 5 - but from the rotating field cycle 283 of this "lag" onwards, there is no corresponding electrical Binary character DO more at the block output.

Incidentally, there is often a corresponding lead time when writing before the takeover, because the write path WL between its input, so the magnetic bubble generating organ, and its takeover organs often similar, one Shift register contains corresponding buffer locations. Besides, it often is It is also beneficial to add a follow-up when writing, although the last one is already The data block was transferred to the secondary loops because it often provides a good starting position of the stored data blocks in the secondary loops, so that the subsequent Reading, cf.

Fig. 5, the advance more or less immediately, i.e. without unnecessary delay, can begin with the supply of the REPLICATE control signal in particular.

FIG. 3 shows schematically an example for the one shown in FIG. 1, in a subscriber station attached telephone answering machine with one of the clock generator ci; clocked microcomputer, e.g. of the above-mentioned type 8048, in particular for rough control of the operating phases of the magnetic bubble memory BM during its consecutive operating phases. The magnetic bubble memory BM contains the Write path, the many secondary loops and the read path. About his, here 5 different, Control inputs CI it is controlled, whereby the transport of the magnetic bubbles - especially during the phase of writing the data bits DI in the write path, the takeover from the write path to the secondary loops, from shifting the transferred data bits DI in the secondary loops, the transfer from the secondary loops to the read path and the transfer of the transferred data bits from the read path as data bits D0 - from a rotating field with a rotating field frequency of e.g. 16 kHz, which an integer fraction, e.g. one seventy-fourth, of the repetition rate of the Clock generator CL is. During the individual rotating field cycles, the control inputs CI of the Magnetic bubble memory BM one for each Typical signal combination supplied to the operating phase section, e.g. in addition to the current pulses CI for the control of the rotating field coils, e.g. a combination of the control signals REPLICATE and STROBE as further components of the control signals CI.

The microcomputer, here 8048, is for example a general purpose computer or a corresponding special control module that works in a manner known per se (at least on a separate, additional module belonging to it or e.g. together on a single component together with the processor of the microcomputer) Contains the counter CT, which is used for the rough control of the rotating field cycles and the a TC counting pulse for each rotating field cycle, e.g. directly from the magnetic bubble memory 3M, or e.g. from a separate PC component of the 8048 / PC microcomputer. The microcomputer 8048 / PC also contains the comparator CP, which checks whether the count of the counter CT corresponds to a comparison value, the microcomputer 8048 / PC from the comparator CP if the comparison value and counter reading are equal - in each case the Resets counter CT and - a new comparison value from the program memory retrieves, and the respective retrieved comparison value of the number of rotating field cycles TC corresponds, after the end of which a different signal combination CI than previously the magnetic bubble memory BM is to control, after the end of this as a signal combination component, e.g. additionally a (REPI.ICATE) control signal CI that has not yet been supplied, and / or, for example, not more a (STROBE) control signal CI, which has been validated up to that point, is to be fed.

E.g. in the program memory of the microcomputer 8048 / PC, e.g. under consecutive addresses, the comparison values or the number of rotating field cycles, for the control signal combination to be issued in the next operating phase section CI saved and the next when the respective operating phase section expires comparison value stored there retrieved, e.g.

in order to load the comparator CP.

If, as an exception, there is no longer any counter CT available in the 8048 microcomputer or if the microcomputer does not contain a corresponding counter CT at all should, then the counter CT can in each case in a manner known per se by means of the Usually always present accumulator register and one the counting result storing intermediate register / RAM memory line are formed.

If the microcomputer does not contain its own unit "comparator" CP, the comparator CP can use a memory register, e.g. a permanently assigned one Line of a RAM, this storage register being e.g.

- saves the respective comparison value, and - if respective count result and respective comparison value, --- the counter CT to zero resets, --- the retrieval of the new comparison value from the program memory and --- is loaded with this new comparison value.

The comparator can perform these activities in a manner known per se can also be carried out using special commands, see in particular the comparison command in - Löbel, Müller, Schmid, Lexicon of data processing, Modern industry publishing house, 2nd edition 1969, p. 539.

Usually such counters CT count from zero after resetting up to the respective comparison value, because they are normally when resetting be reset to zero. But there are also special counter CTs or a special company such counter CT, in which the counter is not reset to zero, but rather is normally reset to a different starting value. Such Counters are often with a toggle circuit or display circuit, in specialist circles usually called "flag", with this toggle circuit causing overflow of the special counter CT, i.e. for an 8-digit counter, for example, its transition from 1111 1111 to 0000 000, by temporarily tilting it or by a signal. A Such a special counter CT is usually called a "timer" in specialist circles. Also the Counter CT of the invention can be such a timer, but not the comparator CP, but in this case the timer CT is to be loaded with the comparison value. at In this development, the counter CT is a timer with a fixed final number, the comparator In this case, CP is a switch-on / display circuit switched over by the timer CT when its final number is reached, and the, e.g.

The comparison value retrieved from the program memory is that in each case Value to which the timer CT is reset, especially on the basis of this timer variant The invention is now to the structure and function of the microcomputer of the telephone answering machine are explained in detail; - this variant has the particular advantage, that its comparator / flag CP is particularly simple, e.g. essentially the next loading of the timer CT with the next comparison value through the overflow output triggers. It is therefore particularly a further training in which the comparator CP compares whether the overflow has already been reached or has not yet been reached.

In this case, the 8048 microcomputer conducts when the toggle switch is switched CP one charge of the timer CT, i.e. with a certain output number, namely the respective differences, on the one hand the one when the timer overflows TI reached the final number and, on the other hand, the initial numbers, the numbers in each case the rotating field cycles TC during the individual phases, resp.

Sections of these phases correspond to the write or read process. The final number is, depending on the type of block used, e.g. 1 (binary 0000 0001) or e.g. 256 (binary 1 0000 0000), if the timer CT is 8 bits wide (1111 1111), the effective width of the timer CT by suitable additional S itself counting structure of the flag / toggle circuit CP, often considerably wider, e.g. 13 instead of 8 bits - in this case the final number of the timer would not be CT more e.g. 256, but just e.g. 8 192, corresponding to the 14-digit binary number 10 0000 0000 0000. So if you want to set the timer CT so that it starts at the 282nd Rotating field cycle overflows (e.g. switching to 0 0000 0000 0000), then you have to before the start of the first rotating field cycle, the final number (binary 10 0000 0000 0000) is reduced at (decimal) 282, load into the timer CT, so that the timer CT at the 282nd rotating field cycle, i.e. at the end of this operating phase or

this operating phase section, the flip-flop circuit CP switches. This switchover triggers e.g.

again the supply of a (REPLICATE) control signal CI, in Fig. 3 via an interposed latch register L, to the magnetic bubble memory BM, and / or (only) reloading the timer CT with one (same or different) Initial number, in particular by the, by several rotating field cycles even later, Switching the flip-flop circuit CP another control signal pattern CI to the magnetic bubble memory BM to forward. The flip-flop circuit CP can therefore, at the end of the operating phase or on End of the operating phase section, e.g. the next, in one Query stored command in memory, which may be

after decoding, the new control signal pattern, or possibly only a reloading of the timer CT, and / or e.g. a disconnection of the (general purpose) microcomputer 8048 from the relevant magnetic bubble memory BM and at the same time a connection to this Microcomputer 8048 with a different component, e.g. with another, shown in Fig. 3 magnetic bubble memory, not shown.

The latch register L represents a collection of between the Module 8048 and the magnetic bubble memory added further flip-flops , whereby e.g. in each wire of the 5 control signal wires, see CI in Fig. 3, respectively such a further tilt shift can be inserted. These further flip-flops L relieve the port of the block 8048 by the other flip-flops L off extremely short control pulses that leave the port, long if necessary continuous control signals CI make z. B. in the right time spans the long ones Current pulses CI for the usual generation of the rotating field in the module BM by means of a Make pairs of crossed coils.

In the example shown in Figure 3, the 11 full rotating field cycles continuous 5 bits of the output signals of the latch register L with corresponding, only 5 bits of output signals lasting only a comparatively very short period of time The fine control PC, explained in more detail below, is ANDed, whereby the control signals CI of the magnetic bubble accumulator BM arise.

The latch register L activates, depending on the bit pattern of its output signal, individual output signal wires of the fine control PC during a full rotating field cycle, so that each of the wires of the fine control PC activated in this way has a serial sequence of bit information as control signals CI determined by the control entrances CI of the magnetic bubble memory BM can be fed. As explained later is, namely during a full rotating field cycle one after the other in uniform Time intervals always the same sequence of bit patterns, here for example 5-bit wide to these, here 5, outputs of the fine control PC. Using the latch register L earth only certain wires of these, here 5, outputs of the fine control PC, activated depending on the operating phase or depending on the operating phase section. This will be individual positions of the bit pattern sequences delivered at the output of the fine control PC sifted out and the associated control inputs CI of the magnetic bubble accumulator BM supplied, but the remaining positions in the bit pattern sequences are suppressed.

The control of the block BM can also be done by means of a microcomputer 8048 belonging microprogram, e.g. by means of the stored in a ROM Firmware, can be monitored and / or initiated by itself, e.g. not during of a whole rotating field cycle, but, in and of itself, with magnetic bubble storage control As is known, only (comparatively briefly and in good time through fine control) in a certain period of time within the relevant rotating field cycle, the new process initiated by the flip-flop circuit CP begins. An example for is in flight. 3 shown. The ROM in question is here in the fine control unit PC contain. The control of the magnetic bubble storage device BM is therefore hierarchical in two ways EDenen divided, a higher-level and slower coarse control, implemented e.g. with the mentioned module 8048 or z ..

with the type 8748 - and a fast fine control PC as a function generator, i.e. for the timely generation of control signals in the respective time periods CI, and in this example even TC counting pulses.

In this example, the coarse control specifies in particular, during which rotating field cycles of the magnetic bubble memory BM which of the signals GENERATE, TRANSFER IN, TRANSFER OUT, REPLICATE etc. are active, i.e. the magnetic bubble memory BM should be fed via its control inputs CI by, depending on the rotating field cycle, or, depending on the operating phase section, during a full rotating field cycle E.g. from the program of module 8048, only certain wires due to the ANDing the output wires of the fine control PC can be activated.

Should a read or write process be initiated with the BM block all releases for the first rotating field cycle are made in the port of the 8048 necessary control signals CI, and the release for the start of the fine control PC with a start signal ST, by activating the output wires accordingly Port initiated.

In a further signal, namely with bit 27 of the port, the The state of the port is transferred to the latch register L, for example, 8 bits wide. The fine control PC, the final the exact beginning and the duration of the control signals CI within of a rotating field cycle is now started by the start signal ST.

The first rotating field cycle of this operating phase is running in the block BM. At the end of each rotating field cycle, the precision control PC delivers via a special output wire the counting pulse TC, which advances the timer CT by one counting unit.

With the count pulse TC, the state is also entered in the latch register L. of the signals emitted by the port are accepted for the next rotating field cycle.

To prepare the port for the following rotating field cycle, stands so at least the time of a rotating field cycle is available. At a rotating field frequency of e.g. 22 kHz this is approx. 45 / u sec, i.e. a lot of time for the clock generator CL e.g. with 5 MHz clockable module 8048. During this time of 45 / u sec So the processor in module 8048 itself then execute at least seven commands.

The timer CT is activated with the counting pulse TC from the fine control PC and counted up. It must be carried out before the beginning of the next phase of operation e.g. be supplied with the comparison value 256 - x by the program, whereby here 256 that given by the construction of the timer CT, assumed here as an example End number and x represents the number of counting pulses TC = number of rotating field cycles, which run until a new pattern of release signals CI must appear at the port.

After these x counting pulses TC, the flag CP is set. e.g. in the program stored in the software in module 8048, e.g. a conditional Jump command triggers. Under the selected jump address is in the software memory of block 8048 read a bit pattern that is the next bit pattern CI is output and that is transferred to the latch register L with the next count pulse TC will. In addition, the timer TI is loaded with a next comparison value 256 - x. This whole procedure between two successive counting pulses TC is allowed with in this example do not include more than seven commands, which is feasible.

If the writing or reading of the magnetic bubble memory BM is to be finally ended, Sort is deleted (only binary zeros). The next counting pulse TC also clears the latch register L and thus all of the enable signals CI stored there, so that no control signals CI are fed to the magnetic bubble memory BM any more, see above this is therefore shut down.

To operate the BM magnetic bubble accumulator, for example, depending on the design, five or nine control signals CI required. These control signals CI are through the fine control PC at the correct time within the rotating field cycle, i.e. in the correct Rotating field phasing, generated.

The timely release of the control signals CI for a whole In the example shown, the rotating field cycle is carried out in cooperation with the fine control PC Supplied with coarse control component 8048.

The fine control PC exists e.g., cf. Fig. 4, from a modulo 74 counter CT1 'one (256 x 8 bit) PR0M and two 6-bit D-registers D. The counter CT' and the Clock CL of the clock generator CL address the PROM. Six PROM outputs are here switched to the data inputs of the two D-registers D. If only 5 control inputs CI are attached to the magnetic bubble memory BM, see. Fig. 3, then suffice per se, with regard to the additional wire for the counting pulses TC, if the in the PROM stored information bit patterns each have only six digits. Are but There are many more control inputs CI on the magnetic bubble accumulator BM, for example the following measures cheap.

A D register D also takes over the information read from the PROM the clock CL, the other D register D with the inverted clock CL. By this measure ground the information from the even PROM addresses to the left, the information from the uneven PROM addresses are transferred to the right D register D. In this way kanmaus the PROM with a word length of only 8 bits a 16-bit word width on the output lines the fine control PC can be achieved, doubling the Wortbrelte a doubling of the lines of the memory, thus a doubling of the Memory depth of the PROM required. A timely release is ensured by fine subdivision ("Fine rasterization") of each individual Drenfeld cycle achieved, e.g. a subdivision in 37 time spans. A fine grid of a full rotating field cycle into a gapless one A series of 37 time periods means a PROM memory depth of 37 x 2 that is then required = 74 words resp.

Lines. Then the control signals CI with time periods of 4.80, i.e. with an accuracy of 4.80, based on a single full rotating field cycle of 3600, not only with e.g. 8-bit width, but even with 16-bit width if required be generated. The control signals CI can, depending on requirements, e.g. by correspondingly operated output amplifiers at the output of the D-register, which are necessary for the operation of the Magnetic bubble memory BM each have optimal strength or curve shape, with also part of the outputs of the PROM, e.g.

two of its eight outputs to control the transmission properties this output amplifier can also be used.

The magnetic bubble memory BM stores, as a telephone answering machine used in the subscriber station of a telephone switching system, thereby Delta modulation modulated speech signals in order to send them out as answers to calls.

The same frequency that this delta-modulated pulse train has then the magnetic bubble accumulator rotating field. The frequency of the rotating field is also due the fine control PC determines if this fine control long PC over the counting pulses TC and, via the timer CT, the rotating field cycle duration of the rough control of the block 8048 specifies. In this example, however, a rotating field cycle is please refer above, 37 times rasterized. The frequency of the clock signal controlling the fine control PC must therefore be 16 kHz x 37 = 592 kHz at a rotating field frequency of 16 kHz, and at 22 kHz rotating field frequency 22 kHz x 37 = 814 kHz. To generate these clock signal frequencies thus the frequency, e.g. 4.92 MHz, of the clock generator CL is correspondingly, e.g. divided by eight or six, e.g. by means of one at the input of the counter CT 'attached frequency divider.

The example of the invention shown in Figures 3 and 4 thus has a microcomputer 8048, the function generator / fine controller counting a clock CL PC for the precise timing of the magnetic bubble accumulator BM during an individual Rotating field cycle contains. This function generator PC is used here in the example also clocked by the clock generator CL. The function generator / fine control PC counts the number of cycles, its counter CT 'is, like a ring counter, after reaching its final number always reset to the same initial number, where this counter successively shows the addresses of the successive PROM lines generated so that at the output during a full rotating field cycle, in each case cyclically one after the other, once all the control signals stored in the PROM as (firmware) information CI are issued, of which only individual places as required by the processor of the 8048 microcomputer.

each with a certain number of cycles counted by the fine control PC this fine control PC delivers the counting pulse TC for the timer TI as well as the others Control signals CI, such as the special signals REPLICATE required for takeover, in each case in the time spans correctly timed for the rotating field phase, i.e. shifted as required according to the corresponding counted number of cycles.

To the in Fig.

and to carry out the reading operations shown, you can operate the microcomputer, if it has a timer CT, the end number of which is 256 (more precisely: binary 0000 000), for example as follows: At the beginning of reading, a rotating field cycle 1 must first run in advance, without other control signals CI being active. The timer TI, which only counts up to 295, is loaded with the comparison value (256-1) (binary: 1111 1111) by the microcomputer 8048 itself, for example by means of firmware. The corresponding release signal for the fine control PC is activated in the port, see FIG

by means of the port, only the points required for generating the rotating field are displayed of the D register outputs released for ANDing, and with a "one" at the bit position 27 of the port, this current state of the port is transferred to the latch register L. The rotation of the rotating field in the magnetic bubble accumulator is activated by means of the ANDing that is triggered by this BM started by energizing the appropriate coil.

While the first rotating field cycle 1 is running, an additional In addition to the DrehEeld control signals CI, there is also the REPLICATE control signal CI for the next one Rotating field cycle 2 activated. The firmware program of the 8048 microcomputer is located is now in the waiting state, for example, until the counting pulse TC, which the fine control PC sends out at the end of each rotating field cycle, the timer CT counts up by "one" and thus the comparator / the flip-flop / the flag because of the overflow CP is switched. By the fine control PC via the OR gate the The counting pulse TC supplied to latch register L becomes the state prepared in the port respectively.

the corresponding activated control signals CI are still in the latch register L taken over and with it the next Rotating field cycle 2 initiated and the control inputs CI both the rotating field control signal and the REPLIGATE control signal CI sent as the next signal combination.

However, the timer CT overflowed with the same count pulse TC, so that now the release for the REPLICATE control signal CI and the rotary field current pulses at the port CI disappear. The timer CT is now activated during rotating field cycle 2 (e.g. by means of the firmware in the 8048 microcomputer, also triggered by the timer overflow CT or from the flag CP) loaded with the value (256 - 83). The current status at the port (only rotary field control signals CI) is finished with the next count pulse TC of the rotating field cycle 2 is transferred to the latch register L and remains during the next 82 rotating field cycles.

The microcotputer 8048 or its processor can now be up to next rotating field cycle 1, see Fig. 5, about 3.4 m sec (82 x 42 / u sec) long with others Controls than deal with the control of the magnetic bubble memory BM, e.g. with the mentioned control of connection sets of the switching system and / or of its switching matrices, and / or especially with the control of others Facilities of the subscriber station, such as recording the time, wanr was called. Only by switching the toggle switch / the flag CP again if the timer CT overflows, the microcomputer 8048 is immediately to continue the control of the magnetic bubble memory BM, namely to reduce the signal combination CI initiated. If the microcomputer 8048 (currently) has no other controls at the same time or has to carry out activities, you can do it, e.g. using your firmware, Wait for the CP flag to be switched over in a four-way loop as well.

This ends the pre-run and the main process begins with the Delivery of the first data block of 282 bits. Namely, has the timer CT or the flag CP reported the overflow, so the STROBE release is also given in the port if required which is transferred to the latch register L with the next count pulse TC.

The timer CT is loaded with the value (256-198). The wait on the switching of the flag CP is now approx. 8.3 m sec, which again is different, e.g. can be used again to control facilities from the 8048 microcomputer.

If a second data block is to be read, then in particular triggered by the same firmware, after the 198 rotating field cycles in port additionally the RE.PLICATE enable active, which in turn with the counting pulse TC for the duration of a single rotating field cycle is transferred to the latch register L. Following, again controlled in a corresponding manner by the timer CT, 84 further rotating field cycles without REPLICATE release until all 282 data bits of the first data block have been read are.

This completes the delivery of the first data block with a length of 282 bits. There are now so many more releases of data blocks in a corresponding manner by means of of the timer CT instead of how many data blocks are to be read this time.

The caster, see. Fig. 6, contains, as already indicated, no more REPLICATE control signal, but only sequences of rotating field cycles, the can only be controlled by rotating field control $ ps1m CI, with the exception that at some magnetic bubble memory module types BM, for transferring the bits from the read path into the electrical data output, also in a corresponding manner from the latch register L a STROBE control signal CI because the timer is here TI only has 8 digits, so because it has the number 256 as the final number, it is for a follow-up, which contains more than 256 rotating field cycles, even if no STROBE control signal is to be output is to load the timer TI several times, e.g. first with (256 - 250), then with (256 - 229) to carry out all rotating field cycles, although in this case in every rotating field cycle only ever to issue one and the same rotating field control signal CI as a signal combination CI are.

One advantage of the latch register L is that it enables the Port, or the ports, of the microcomputer 8048 so that the microcomputer 8048 especially often over and over again for long periods with controls of other devices, instead of the control of the magnetic bubble memory BM, can deal. But even if no such latch register L were inserted, the microcomputer at least in those times after the follow-up shown in FIG. 8 and before the later next lead, or - if such leads are omitted and / or Follow-ups - those in the often long pauses between the execution of a first main run and a second, much later main sequence, with control of others Deal with facilities, such as the control of other facility facilities.

As already mentioned, these other devices can also e.g. Centrally attached components of the telephone switching system, such as switching matrices and / or connection sets of this system, so that the microcomuter 8048 not only the magnetic bubble storage tank BM, but e.g. additional controls within the system can perform.

In summary, the following can be stated for the application described: A counter, in particular a timer CT, is used to count depending on the Number of rotating field cycles that have elapsed in each case are determined by further controls of the Magnetic bubble memory BM, e.g. the delivery of further data blocks, by means of the (multi-purpose) microcomputer 8048 to expire by appropriate sequences of combinations of releases for control signals CI at the port (s) are generated. This is done using the counter / timer CT, e.g.

by a firmware command, corresponding to the number of rotating field cycles / counting pulses TC, up to a change in the combination of control signals to be output via the port CI should take place, loaded. Until this change is necessary, the microcomputer can 8048 with the processing of other programs or with the control of other devices deal. After the set number of rotating field cycles, the counter / Timer CT or the comparator / flip-flop circuit CP the sequence of the control of the other devices and the control of the magnetic bubble accumulator BM is continued, by activating the corresponding next combination of control signals on the port or generated wtrd For this purpose, the counter / timer TI is loaded in such a way that it changes the next signal combination is then triggered by means of the comparator / flip-flop circuit CP when the control signals of the microcomputer 8048 should change again. The output from the 8048 microcomputer Combination of control signals CI is the corresponding combination of free forks of these control signals of the magnetic bubble memory module BM, e.g. REPLICATE, - TRANSFER IN, TRANFER OUT, REPLICATE, STROBE, SWAP, GENERATE.

Using the example of a read process control, it was shown how the counter / timer CT accordingly with the number (1) of rotating field cycles required for the first REPLICATE- Control signal is loaded. The release signal for the The rotating field is output by the port. The counter / timer TI receives per rotating field cycle a count pulse TC. The timer CT is loaded e.g. with 256 - 1 and that too REPLICATE control signal at the port, to take over the information from the secondary loops in the read path, activated.

If the comparator / flip-flop CP responds, it is e.g. Timer overflowed, the REPLICATE control signal on the port is deactivated, the counter CT correspondingly reset to zero or according to the timer CT (for the Continuing with the counter CT, the comparator CP) will correspond to the next Number (83) of rotating field cycles loaded, which is necessary to the in the magnetic bubble memory BM first data block transferred to the read path, more precisely the first 198 bits of the same, to be able to go off at the read output of the magnetic bubble memory module BM. As soon as now the comparator / flip-flop CP responds again, the comparator / timer with the next comparison value, e.g. (1) or

(256 - 1), corresponding to the number (1) of rotating field cycles required loaded for the additional output of the next REPLICATE control signal. Through this is sent in addition to the output of the next bit DO at the output of the block BM the REPLICATE control signal CI delivered to the block BM.

If the comparator / flip-flop circuit responds again, the comparator will CP / Timer CT loaded again with the next comparison value, e.g. (83) or (256 - 83), whereby the remainder of the data block is released; but the counter / timer CT has one sufficiently high final number, e.g.

1024 instead of 256, the comparator / timer can then immediately accordingly the number of rotating field cycles (here 281) loaded up to the next REPLICATE control signal will. Speaks the comparator / toggle switch CP on again, if the counter / timer CT can only count up to 256, more precisely up to binary 1111 1111, then finally the comparator / timer according to the number of rotation cycles (198) loaded in order to restore the first 198 until the next REPLICATE control signal Read out bits of the next data block.

However, if no further data block is to be read, the Comparators / timers are loaded according to the number (479) of rotating field cycles, which are necessary to restore the information stored in the secondary loops to bring them into their starting position favorable for a reading process. Speaks if the comparator / flip-flop circuit CP is on, the release, in particular on wire 27 of the port, removed for the rotating field. The reading process is finished and the beginning prepare for the next reading process- =. In the meantime, the microcomputer can 8048, no longer interrupted by the magnetic bubble spoke - control, exclusively with the control of the other units and / or with the processing of any programs deal.

In the exemplary embodiment described, the comparator speaks Flip-flop circuit CP thus approximated at the beginning of the last rotating field cycle of the respective operating phase section.

In a further development of the invention, the defective Secondary loops treated as if they were non-defective by removing bits of the signals in the form of appropriately generated magnetic blowers via the takeover organs only the non-defective, but also defective secondary loops are fed, and in that bits of the signals DI in the form of appropriately generated magnetic bubbles replacement secondary loops are also supplied will. On the merits this additional measure for magnetic bubble accumulators containing secondary loops / sub-loops, in particular of telephone answering machine, is already for itself in the not pre-published Registration P 30 24 770.2 (= VPA 80 P 6089 DE) received. This training of the The invention is therefore based on the knowledge described in the earlier application, that especially the delta modulation, especially the so-called adaptive delta modulation, for storing speech signals in particular, i.e. spoken texts, e.g. for telephone answering machines or announcement services, because with the delta modulation largely the same high voice quality or

Sound acoustics such as with PCM after the demodulation of the delta modulated Signals is reached - even if, for example, up to 15% of the binary signals have already been reached the modulated recording has been corrupted by interference by erroneously a 1 't1 "instead of a" 0 "or a" 0 "instead of a" 1 "was set in the signal. The bandwidth of the frequency band can be used for approximately the same voice quality the delta-modulated response is often even smaller than the bandwidth of the frequency band a PCM-modulated response can be chosen: If the upper limit frequency of the demodulated Signal fo (e.g. about 4 kHz) is required for PCM at e.g.

32 levels of the quantized instantaneous signal 5 binary signals per instantaneous signal, i.e. 10-fo kHz (= 40 kHz) PCM binary signal repetition frequency - but e.g. only 16 kHz Binary signal repetition frequency for the delta modulated signal.

With delta modulation, fewer requirements are therefore required for the Great of the storage capacity and most importantly of the proper functioning of everyone To provide memory cell of the memory storing the binary signals. For a good Speech quality is sufficient with delta modulation a binary signal sequence frequency, the three to four and a half times higher than the upper limit frequency fo of the frequency ba) l (les of the demodulated signal. At , lower requirements the voice quality is already sufficient if the delta modulated signal is a The binary signal repetition frequency is about twice (8 kHz) that of the upper frequency band limit frequency fo (4 kHz). If you want a particularly high voice quality, then you can also choose a much higher binary signal repetition frequency for the delta modulated signal, e.g. eight times (32 kHz) the upper limit frequency fo (4 kHz). Another The advantage of delta modulation is that between the memory and the receiver, e.g. Loudspeaker, often a decoder no longer needs to be inserted because it can be used The frequency band of this receiver is often well below the binary signal repetition frequency of the delta-modulated signal so that this receiver, e.g. loudspeaker, in itself already acts as a demodulating low-pass filter, which this sequence frequency, so the carrier frequency of the delta modulation, so to speak, largely sifts out.

Above all, the development of the invention is also based on the in the earlier application described finding that it is often unnecessary, logical Insert zeros for defective secondary loops in the bit sequence, which in the write path is written serially when the signals to be stored are delta modulated modulated and the bit sequence obtained in this way to be stored in a magnetic bubble memory which, in addition to a write path, also contains those secondary loops. As above explained, even relatively high percentages of the stored bits are often allowed be falsified by disturbances.

The development of the invention is therefore a magnetic bubble memory with additional replacement secondary loops, the bits DI of the delta-modulated signals, cf. Ancillary loops are fed in via the respective takeover bodies. This further training allows in particular, despite the low number of rejects quote in the magnetic bubble spoke position, all of these existing Secondary grinding to be able to use it for storage and thus to make the number of bits stored on the magnetic bias memory sufficiently functional, which means that the duration of the stored signals is also longer when reading than if the defective secondary loops were also described, but no longer those, mostly Any additional, replacement secondary loops that are already present can also be described. As a result, the hardware effort required per se at high rotating field frequencies, e.g. at 150 kHz, for the intermediate storage of the binary signals in a buffer memory, which converts the binary signals read with this high, here 150 kHz, rotating field frequency into a binary signal sequence with the necessary low (here 16 kHz or 22 kHz) repetition frequency can be left out.

6 figures 7 claims Blank page

Claims (7)

Claims. 62 Telephone answering machine for sending on an integrated Memory of responses recorded by binary signals formed by pulse modulation, where - the sound carrier is a programmable read-only memory, namely a magnetic bubble memory which stores the answer in delta modulation, and - the rotating field frequency of the Magnetic bubble memory is less than 40 kHz and at most eight times and at least is twice the upper limit frequency of the response voice frequency band, according to Registration / Pabent P 30 24 688.9 = 80 P 6087 DE, d a d u r c h e k e n n n z e i c n e t that - the magnetic bubble memory when writing the answer and when Sending the response from a microcomputer clocked by a clock generator (CL) (8048) for rough control of the magnetic bubble accumulator (BM) using various Signal combinations are controlled as control signals (CI), - the microcomputer (8048) --- contains a program memory, --- contains a counter (CT) that counts for each Rotating field cycle receives a counting pulse (TC) and --- contains a comparator (CP), which checks whether the counter reading of the counter (CT) corresponds to a comparison value, - The microcomputer (8048) from the comparator (CP) if the comparison value is equal and counter reading resets the counter (OT), a new comparison value from the program memory, the respective comparison value of that number corresponds to the rotating field cycles (TC), after which another signal combination (CI) is supposed to control the magnetic bubble accumulator (BM) than was previously the case. 2. Telephone answering machine according to claim 1, d a d u r c h g It is clear that - the counter (CT) in each case by means of the accumulator register and an intermediate register storing the counting result is formed, - the Comparator (CP) is formed by a memory register that stores the respective comparison value saves and, if the respective count result and the respective comparison value are the same, the Resets the counter to zero and retrieves the new comparison value from the program memory initiated and loaded with this new comparison value. 3. Telephone answering machine according to claim 1, d a d u r c h g e k e n n n z e i h n e t 'that - the counter (CT) is a timer with a fixed end number - the comparator is a toggle switch switched over by the timer when the end number is reached - the retrieved comparison value is the value to which the timer (CT) is postponed. 4. Telephone answering machine according to claim 2 or 3, d a d u r c h e k e n n n n e i c h n e t that - the microcomputer a clock counting function generator (PC), for phase-appropriate fine control of the magnetic bubble accumulator (BM) during a individual rotating field cycle, this function generator (PC) also is clocked by the clock generator (CL) and counts the number of clocks, each like a ring counter, after reaching its final number always reset to the same initial number the counting pulse is generated at a certain number of cycles counted by him (TC) for the timer (TI) supplies and --- the other control signals, such as the special signals required for takeover, as required for the rotating field phase shifted phase according to the respective counted number of cycles, (over CI) to the magnetic bubble memory (BM). 5. Telephone answering machine according to one of claims 1 to 4, d a d u r c h e k e n n n z e i c h n e t that - between the microcomputer (8048) and a bistable multivibrator (L) is inserted into the control inputs (CI). 6. Telephone answering machine according to one of the preceding claims, it is noted that - treats the defective secondary loops are as if they were not defective by putting bits of the signals in the form of accordingly generated magnetic bubbles over the takeover organs not only the non-defective, but defective secondary loops are also supplied, and - bits of the signals in the form of Correspondingly generated magnetic bases are also supplied with replacement lower loops 7. Use of the telephone answering machine according to one of the preceding claims, it is noted that - the microcomputer (8048), at least in times when he is not controlling the magnetic bubble memory, facilities one Feirnnielde switching system, e.g. Facility facilities of the relevant subscriber station controls.