DE2753364A1 - Universal selector receiver for telephone exchanges - has processor and control for multifrequency code and dial-pulse signals - Google Patents

Abstract

The universal selector receiver comprises a central processor (22), ROM (23), clock generator (29), input gate (21), output gate (24) and analogue/digital converter (28). A shared data bus connects the gates, CPU and ROM. The system can be in the form of a microprocessor. The A/D converter is fed from a crosspoint matrix (KF) with multi-frequency code and dial pulse signals. The ROM contains a program with which to check which of these signals is present. Multi-frequency code signals are sampled at a frequency of 8 KHz which is employed in many telephone exchange installations. The processing of the signals is done using quadrature correlation methods. If dial pulse signals are detected, the processor switches the clock generator to a lower rate.

Description

"Signal receiver for the detection and evaluation of analog

Signals "(addition to patent application P 27 23 570.7) The invention relates to a signal receiver for recognizing and evaluating analog signals specified frequency or signal form for telecommunications or data processing systems of the type mentioned at the beginning.

The main patent solves the problem of a signal receiver for multi-frequency code selection signals (MFC dial signals) to indicate the disadvantages of the prior art such. B. the use of complex filters, consisting of inductors and Capacities, or many individual modules and using inexpensive standard modules in Large-scale integration technology is feasible.

The invention according to the main patent is that a device is provided, which scans the received analog signals, including the MFC selection signals and analog / digital converts that a microcomputer is connected to the device is which the digital signals are program-controlled according to what is known per se Quadrature correlation method processed and the received signals more predetermined Frequency determined, and that the signals determined by the microcomputer are predetermined Frequency can be evaluated by another facility.

However, the signal receiver according to the main patent has the disadvantage that due to his training he can only be used for evaluating analog signals is and in the transition period, in the telecommunications exchanges only number switch impulse dialing signals (NSI dialing signals) are processed, not einsejz bar or in telecommunications switching with NSI and MFC dial signal processing in addition to receiving NSI signals set up voting signal receivers are required.

The present invention is therefore based on the object to improve technology. In particular, a signal receiver is to be specified that is universal can be used.

According to the invention, this object is achieved in that the dialing signal receiver of the type mentioned is designed such that both MFC and NSI dialing signals are recognizable, readable and evaluable. Through this training are now selector signal receivers space-saving, inexpensive and highly reliable realizable, both in telecommunications switching systems for processing NSI voting rules as well as in telecommunications switching systems for processing MFC dialing signals are also in the transition period, in the transition from NSI dialing signals to MFC-Watilsignale is changed over, an inventive selection signal receiver can be used flexibly.

Advantageous further developments and refinements of the invention are specified in the subclaims. A first advantageous embodiment is in Able to type a received without the support of another control unit Recognize dialing signal and evaluate it accordingly.

Such a dialing signal receiver can be used universally.

Further advantageous configurations are for telecommunications switching systems thought that have a central control, which the dialing signal receiver signal the type of voting signals to be processed. The voting signal receiver group This leaves more time for additional tasks.

Advantageous further developments offer the possibility of several dialing signal lines to operate at the same time, so that additional space and costs can be saved.

The invention will now be made use of with reference to exemplary embodiments explained in more detail by drawings. They show in detail: FIG. 1 block diagram a dialing signal receiver for NSI and MFC dialing signals for connection sn a dialing signal line Figure 2 block diagram of a dialing signal receiver for NSI and NPC dialing signals for connection to several dialing signal lines Fig. 3 Like Fig. 2, but with an analog multiplexer. Fig. 4 is a block diagram of a room-division private branch exchange with a central control Fig. 5 block diagram of a dial signal receiver with separate inputs for NSI and MFC selection signals and two computers Fig. 6 Block diagram a dial signal receiver for NSI and MFC dial signals with dial signal processing via a buffer tank.

The selection signal receiver shown in Fig. 1 contains a computer 22, a read-only memory 23, a clock generator 29, an input port 21, an output port 24 and an analog / digital converter 28. Input port 21, computer 22, read-only memory 23 and output gate 24 are connected to one another via a common data line 25. The units 21 to 25 can advantageously be implemented as a microprocessor be.

The input of the analog / digital converter (A / D converter) 28 is with a dialing signal line of a switching matrix can be connected.

Its input is also the input of the voting signal receiver.

The digitally converted signals arrive advantageously as 8 bit code words parallel to the input port 21 of the microprocessor. The speed the analog / digital conversion is determined by the clock generator 29, its clock frequency can be controlled by the arithmetic unit 22 and its clock also the processing speed of the computer controls.

The read-only memory contains a first program with which it is constantly checks whether there are MFC or NSI dialing signals. The evaluation of the MFC voting signals can be done for example according to the main patent.

The evaluation of NSI election signals is relatively easy, since this only put together from binary signals of a given duration. For example, you can according to the in the book Peter R. Gerke "Computer-controlled Vermittlungssysteme'1, Springer-Verlag, Berlin, Heidelberg, New Tork (1972), pp. 116-121, are carried out.

Did the dialing signal receiver know the type of dialing signal received If constant evaluation is recognized, the corresponding program is used for further evaluation the selection signal is read from the read-only memory 23, processed in the computer 22 and the respectively recognized binary digit is transferred to the output gate 24 for further processing.

MFC dial signals are preferably sampled at a frequency of 8 kHz. This sampling frequency has the advantage that it can be used in many telephone exchanges is already available and the sampled values occurring at 8 kHz are safe from Calculator can be evaluated. The evaluation of the MFC selection signals takes place in advantageously according to the known quadrature correlation method, which is described in detail in the main application.

If the computer has recognized NSI dialing signals, the computer can use the clock generator 29 switch to a much slower sampling frequency, since the evaluation of the NSI selection signals only require a few samples per second. This can the computer can be used in an advantageous manner to take on further tasks. For example, instead of a single dialing signal line, it can also have several dialing signal lines monitor and evaluate their election signals.

In Fig. 2 is the block diagram of a dial signal receiver for NSI and MFC dialing signals are shown, which can evaluate multiple dialing signal lines. So he is characterized by records that he has several entrances, in the example has n inputs and a series connection at all inputs an A / D converter and an input gate is connected and the input gates are connected to at least one computer. The same units as in Fig. 1 are provided with the same designations. In contrast to Fig. 1, however, are on the data line (Bus) 25 connected to a total of n input ports 211, 212, ... to 21n. Every entry gate is connected to the input of the dial signal receiver via an A / D converter 281, 282, ... or 28n connected, dei with n dialing signal lines of the switching network of the telecommunications switching system connected is.

In this case, the computer 22 queries the input ports 1 to n in the series after, i.e. in multiplex operation, from. The multiplex operation can be carried out by several from Clock generator 29 and A / D converter controlled by Xechner 22 or, as FIG. 3 shows, performed by an analog multiplexer in conjunction with a fast A / D converter will.

In Fig. 3 is the analog multiplexer with 33 and the fast A / D converter labeled 280. The clock generator determines the speed of the A / D conversion 290 in connection with the computer 22. In this case, the computer 22 takes over the bus line 25 and an output gate 31 controls the analog multiplexer 33 by means of the multiplex control 32 connected to the output gate 31.

Multiplex operation can be implemented, for example, by that the computer 22 at a time interval of z. B. 10 ms n dialing signal lines of the switching matrix and when receiving an NSI dialing signal immediately after the frrecognize an impulse and when receiving an MFC dial signal immediately after the recognition a selected digit causes the multiplex control, the other inputs of the Polling signal receiver.

Instead of one computer 22, two or more computers can also be used own storage space in read-only memory 23 and possibly own output ports be provided so that as soon as a computer evaluates a selection signal input has taken over, the next computer monitors the remaining dialing signal lines takes over. Another computer can always be configured with the appropriate program can also be sent to take over the task of the first computer if it fails and to signal the failure.

An even larger number of dialing signal lines can be used by one Signal receiver according to the invention then supply when the telecommunications switching system provided with a central control that recognizes the dialing signals to be expected is, as is often the case, for example, in private branch exchanges Case is.

For example, in Fig. 4 is the block diagram of a multiple room private branch exchange shown with a central control. The central control ZS receives over the identifier Id the message that a certain subscriber Tl a connection want to build. Due to the connection position of this participant, the control known whether this subscriber will send out NSI or MFC dialing signals, so that the central control the computer of the dialing signal receiver the type of expected Can signal dialing signal. Here the signal receiver is advantageous so train that his evaluation program via a control line from the central Control ZS is switchable.

Fig. 4 also shows that the central control via an adjuster E controls the routing in the switching network KF.

On the one hand, there are subscriber circuits on the switching network KF Si the participants TLi connected (i - 1, 2, 3 ... n). On the other side of the Are located Connection sets, for example internal connection sets IVS, office transfers Aü and cross-connection records QUVS. The switching matrix also contains the dialing signal lines a, b, c, d, ..

for the connection of dialing signal receivers. So it is z. B. possible to each selection signal line a signal receiver according to FIG. 1 and several selection signal lines to be connected to the signal receiver according to FIG. 2 or FIG.

In the presence of a central control, the computer of the signal receiver must not determine the type of dialing signal, so that this time gain is exploited can be used to add further selection signal lines from a single signal receiver supply. The evaluation program can be reversed using a separate signaling line to the dial signal receiver and there via the data bus 25.

In Fig. 5 is the block diagram of a selection signal receiver with for NSI and MFC dial signals separate inputs and at least two computers are shown. In the exemplary embodiment shown, the switching network has two groups of dialing signal lines on, one group for NSI and a second group pe for MFC dialing signals. The connection of the voting signals given by the participants to the respective group the central control ZS (Fig. 4), so that no separate signaling over the type of dialing signals to be expected for the dialing signal receiver required is.

In each case n selection signal lines of the first group are via n-bit input gates 26i, where i - 1, 2, ... q, and are the selection signal lines of the second group via at least one A / D converter 28j, where j is X 1, 2, ..., p, each with one respective A / D converter downstream input port 21j on at least one computer 222 or 221 with associated read-only memory 232 and output gate 242 or 231 and 241 connected.

Since common input gates process 8 bits in parallel, it is more advantageous Way possible, 8 signal lines of the NSI group to the 8 inputs of an entry gate to be connected This is as far as possible because NSI dialing signals represent digital signals, each entrance of an entry gate can receive and transmit a digital signal and NSI dial signals arrive much more slowly than MFC dial signals. Thus is able the computer 222 already supplies 8 dialing signal lines with a single input port.

However, there are dial signal lines leading to the MFC dial signals an A / D converter and a downstream input port are required, whereby here too, as already shown in FIG. 3, a larger number of slower A / D converters can be replaced by an analog multiplexer with a fast A / D converter. The particular configuration of a dialing signal receiver depends primarily on the given conditions and the respective market situation.

In the embodiment shown in Figure 5, two computers 222 and 221 provided, one of which is a computer 222 with its input ports 261 and 26q, its memory 232 and its output port 242 has its own data bus 252 and only processed NSI dialing signals. The second computer 221 with its input ports 211 to 21p, its memory 231, its output port 241 and data bus 251 are processed MFC dial signals only. This has the advantage that every computer requires only one processing program and therefore a larger number of input ports can be monitored in multiplex operation.

When using a fast calculator, it is advantageous if this all input gates in multiplex mode protrudes and serves Another advantageous Embodiment of the invention is in Fig. 6 shows and sees before that for telecommunications switching systems with one of the expected dialing signals recognizing central control two computers 223 and 224 are provided, which over a buffer memory 34 are in communication with each other, so that the one computer 223 sample values of selection signals word by word to the buffer memory 34 for reading and the other computer 224 transfers the buffered values to binary digits evaluates. In this exemplary embodiment, too, there are two groups of dialing signal lines intended for NSI and MFC dial signals. However, the computers are cheaper here than used according to the embodiment shown in Fig. 5, because the tasks which the computer of the dialing signal receiver has to fulfill essentially exist from two sections, on the one hand the reading in of the voting signals and on the other hand the Processing including the transfer of the decoded digits.

According to FIG. 6, these two subtasks can be divided into two Process computers 223 and 234, so that the reading process of samples of the selection signals by means of the computer 223 via input gates 21j and 26i and via the output gate 243 into the buffer memory 34 and the processing of the from the computer 224 via the input port 35 samples read out from the buffer memory 34 can run in parallel. To coordinate the transfer of the samples from one computer to the other the buffer memory 34 is a synchronization unit 294 in the exemplary embodiment provided with an integrated clock generator, which the operation of the computer and the Buffer memory controls and via the data buses 253 and 254 the required pulses for reading in and reading out the sampled values.

Another embodiment of the invention does not contain any separate ones Dialing signal receiver; on the other hand, the tasks of Dialing signal receiver by connecting microcomputers that provide both NSI and MFC selection signals can evaluate, taken over in the connection sets (Fig. 4). The advantage of this The arrangement is that there is no separate connection to the dialing signal receivers is required while the connection is being established.

When using fast computers, these can also provide dial signals for evaluate a group of connection sets. It is also advantageous that the used microcomputers not only as dialing signal receivers but also as dialing code converters or can be used to control the transmission of messages or other records.

Selective signal receivers according to the invention are also advantageously used in time division switches applicable. A subscriber is in this case via a subscriber circuit, a Fork and an amplitude sample transmitter or amplitude sample receiver to a time division multiplex line connected. A separate direct current transmission path is used to transmit NSI signals. By means of the control, the selection signals are either in certain predetermined time slots or can be transmitted in any time slot. For the evaluation of the voting signals the dialing signal receiver according to the invention, as shown, for example, in FIG. 3 as Block diagram is shown, with its analog multiplexer to an amplitude sample receiver, which is connected to the common time division multiplex line, coupled.

Claims (17)

Claims 18 signal receiver for the detection and evaluation of analog signals of predetermined frequency or signal form for telecommunications or data processing systems with a device that samples the received analog signals and analog / digital converts, to the device of which a microcomputer is connected, which the digital Signals are program-controlled according to the quadrature correlation method known per se processed and determined the received signals of a predetermined frequency and at the the signals of predetermined frequency or signal shape determined by the microcomputer another device can be evaluated (according to patent application P 2 '? 23 570.7), characterized in that it is designed to be of him as well as MFC and NSI dialing signals can be recognized, read in and evaluated. 2. Signal receiver according to claim 1, characterized by its use in telecommunications switching systems. 3. Signal receiver according to claim 1 or 2, characterized in that that it recognizes the type of dialing signal received through constant evaluation (Fig. 1). 4. Signal receiver according to claim 2 or 3, characterized in that that the device that samples the received signals and analog / digital converts, is an A / D converter (28) controlled by a clock generator (29) which the received dialing signals are sampled at a frequency of 8 kHz and analog / digital converts and that the output of the A / D converter (28) with a first input port (21) of the computer (22) is connected (Fig. 1). 5. Signal receiver according to claim 4, characterized in that the Computer (22) controls the frequency of the clock generator (29) so that the sampling frequency of the A / D converter (28) is adapted to the type of selection signal (Fig. 1). 6. Signal receiver according to one of claims 1-5, characterized in that that it has several inputs and a series connection at each input an A / D converter (28i) and an input gate (21i) is connected and the Input gates (21i) are connected to at least one computer (Fig. 2) (i = 1,2, ...) 7. Signal receiver according to claims 1-5, characterized in that all inputs are connected to an analog multiplexer (33), at the output of which the series circuit an A / D converter (280) and an input port (210) is connected (Fig. 3). 8. Signal receiver according to one of claims 2-7 in the event that a central controller for a switching network controller that recognizes the type of dialing signals is provided, characterized in that the evaluation program via a control line can be switched from the central control. 9. Signal receiver according to one of claims 1-8, characterized in that that NSI selection signals can be fed to the computer (22) via a second input port (26) are and that for the two input ports (21 and 26) different ibtastfrequenzen are provided. 10. Signal receiver according to claim 2 in the event that the switching matrix the telecommunications switching system a first group of dialing signal lines for NSI dialing signals and a second group of dial signal lines for MFC dial signals, thereby characterized in that in each case n selection signal lines of the first group via n-bit input ports (26i) and the Wahlsignallei lines of the second group via at least one A / D converter (28j) with respective downstream input port (21j) on at least one computer connected (i - 1, 2, ...; å G 1, 2, ...) (Fig. 5). 11. Signal receiver according to claim 2-10, characterized in that at least one computer is provided, which all input ports (21j, 26i) in multiplex mode queries and operates (Fig. 2). 12. Signal receiver according to claim 10, characterized in that the series connection of an analog multiplexer to the inputs for MFC-Wahlsigaale (33) is connected to an A / D converter (28x) (Fig. 3). 13. Signal receiver according to claim 2 for telecommunications switching systems with a recognizing the expected election signals central control, characterized in that two computers are provided which have a buffer memory (34) are connected to one another, so that the one computer (223) samples of choice signals word by word to the buffer memory (34) for reading and the other computer (224) evaluates the temporarily stored values (FIG. 6). 14. Signal receiver according to one of the preceding claims 2-13, characterized by its use in a connection set. 15. Signal receiver according to claim 14, characterized by its use for a group of connection sets. 16. Signal receiver according to one of claims 8-15, in the event that a central control is provided in the telecommunications switching system, thereby characterized in that it is integrated in the central control. 17. Signal receiver according to one of the preceding claims, characterized through its use as a ballot converter.