DE2314272C3 - Method and arrangement for the distribution of audio signals and call signals in a time division multiplex communication system - Google Patents

Description

are continuously offered in the broadcast procedure,

there is no delay until a participant receives such a character, caused by the establishment of a connection between the audio generator and the participant will.

An embodiment of the invention is described below with reference to the drawings. It indicates

Fig. 1 shows the temporal course of an audio signal and the partial signals from which it is composed,

Fi g. 2 the timing of the rhythm signal for different audio signals and call signals,

3 shows a data format for the coded representation all audio signals provided in a system in two separate bit groups,

4 shows the block diagram of a message transmission system with time division multiplexing

4 The invention relates to a method and its application for the distribution of audible signals and call signals to subscriber stations in a time-division multiplex message system.

In such communication systems, in particular in telephone systems of the type shown in DT-OS 2 136 361 In this way, the participant is informed of certain conditions by means of audio signals or call signals. Such states are e.g. B. the availability of the exchange facilities for dialing and for Gc conversation setup (Dial tone), the unavailability / the called subscriber (busy tone), or the A connection was established between a calling and a called subscriber (Callsign and dial tone).

In institutions that have become known, the audio signals are generated centrally and selectively

for a number of participant locations,

Fig. 5 Format and division of the time division multiplex frames for a communication system distributed against channels or lines, on which a 35 measured Fig. 4, Audio signals are delivered to a subscriber station

the must. Such facilities are in the DT-OS audio signal information in advance of the time mul- ^ 2 000 832 and in DT-OS 1 945 155 described. tiplex frame,

In this last-mentioned DT-OS, the own share of a subscriber station is included in the feed-in Fig.7

Solution of the audible tones in the Multiplexkanälc its own 40 for the reception of the transmission switching network according to the invention used. necessary facilities.

The known methods for the transmission of audio signals ■, ..

have some disadvantage? for time division multiplex systems: audio signals and their components

First, for the transmission of an audio signal. In Fig. 1, the time course of an audio signal

a connection, ie a channel between the switching signal and its components, and the subscriber station, is required. Such shows. In order to generate the complete signal α , connection is indeed required during a call - a fundamental tone or audible tone d, which in many systems is required for what reason. However, the speech channel could be a sine tone of 400 to 500 Hz, through a binary during the mere audio signal transmission (e.g. res rhythm signal c periodically switched on and off busy tone, if desired trunk line or activated. Finally, a switch-on signal b the desired subscriber not available) or other duration determined during which a certain are widely used if the audible signals on an- subscriber station is to receive an audible signal which could be transmitted along the same path. Have the different audio signals of a system

Another disadvantage is that they usually have a common keynote and are different Distribution device is necessary to the in 55 den just by their rhythm. In Fig. 2 are the switching generated audio signals based on the rhythm signals for different audio signals selected lines or channels to distribute. Shown therein and call signals: under a) for the call and the must also have memory space for the respective ringing tone assignment (although the ringing frequency is usually 25 between any number of selected Ka- Hz, while the ringing tone is the usual audio tones and which has to be transmitted to them temporarily at a frequency of around 400 to 500 Hz); under b) for the audio signals must be provided. the busy signal; and under c) for a command,

The invention is based on the object that the calling subscriber a dialing error or Method and arrangement for Hörzeichenver- indicating a fault in the system. Many more time divisions indicate that the disadvantages mentioned are possible, z. B. the dial tone when occupied avoid, which also - especially for telephony system - 65 of a line selector or a channel (in the are suitable in which a time-division multiplexing embodiment is a constant one for this mentation takes place in a ring structure and in which the intonation is accepted), or an intrusion tone for information transmitted digitally and automatically from joins an existing connection. The rhythm

5 6

mus-Mustcr and its period duration depend on the ddt, therefore, around a "sub-multiplex channel", the

local PTT regulations. is available to all connected devices.

Common for all audio signals and call signals The position »B / F« in the first Zciischlitz shows whether

is that a basic signal from a binary rhythm of the submultiplcxchannel for the relevant multi

signal is controlled. It is now proposed, 5 plex cycle is still free or already occupied, and the

to provide these two components separately Position »S / D« indicates whether the subsequent time

and from the components there is a complete slot /.) for controlling subscriber stations or

diges audio signal (or call sign) to generate, where central operations serving signaling information

it is needed. or contains data to be transmitted transparently.

F'.n scheme for separate treatment and »o

The audio signal components are transmitted in audio format

Fig. 3 shown. The fundamental tone (audible tone) can be used as a. It is now proposed to provide the information for

normal speech signal can be sampled (e.g. with all audio signals occurring in a system

a sampling frequency of 8 kHz); the samples over the lead field of the Multiplcx time frame

are then coded e.g. in PCM. and distribute as code .5, according to the scheme shown in Fig.3

words («B.t-characters) transferred one after the other. Which is shown. The audio signals can then, so to speak

Rhythm signals are all sampled in parallel, and continuously for all participants in the broadcast process

are offered with a much lower sampling frequency; only those subscribers

than the fundamental, because the rhythmic impulses are very | _en previously requested to do so by control signals

are long in comparison with the period of the basic * o, inferred from the corresponding audio symbol

tons. At each sampling time (see Fig. 2d) for the ring circuit

each of the rhythm signals one binary sample each The transmission of the fundamental tone and rhythm

gel.efcrt. Be, k different horological signs result in formation occurs separately, as in context

So Ä: E.nzelbits, which have already been explained to a group together with Fig.3. The audible tone is im

summed up and transmitted together, a separate multi-

^{ncnplexkanal is} provided, which by the third time

Zcitmultiplexrahmcn structure slit / - 'shown in advance of each time frame

will. A coded sample value of the fundamental is

Can 4 shows in block form a Nachrichtcnübertra- So every 125 _{(<transmitted} s, so that each Teilnchmergungssystcm with Zeitmultiplcxvermittlung for Toggle 30 put the root at all times due to these Terminated Teilnchmerslcllcn where regenerate a crfin- sample values

Proper distribution of horological signs or calls It would also be possible to use the keynote locally in each

drawing can be realized. The subscriber to generate the subscriber device But that also has

represent T (each with a corresponding tax and disadvantages, and which are presented here in the exemplary embodiment

Connection device) are either designed on the flciMMTi using a sleek solution.

The oval line with its switching module leaves it for the basic tone regeneration which occurs in each

connected, whereby the line itself is used as a multiplexer / subscriber device.

Dcmultiplexer acts; or it is a more concentrated direction can be used because di <- A.hiastfre-

Multiplcxcr / Demultiplcxer (M) provided, the one qucnz and the code for the root channel "and the

.niere has a ring structure and with which the subscriber 40 normal (synchronous) voice channels are the same,

set, i.e. their control and connection device. The rhythm information is not - like the

fundamental tone connected in a star-shaped arrangement - in its own channel, but in the un-

^sim ? ' . . ". . . ■ _A λ- τ t ·. term multiplex channel (asynchronous channel!) transmitted,

The information alternates with other signal information or

heal organized in cyclical timeframes, as in 45 dates. This is possible because the rhythm

Fig. 5 shown under a). The principle of the values used because of the long intervals of the binary

Zc.frame structure was already transmitted much less frequently in the Swiss rhythm signal

Patent 514 268 describes each Zcitrahmcn of must as the sample values of the basic audio sign

125 | .s duration: is divided into 32 timeslots, for example. tons or the speech signals The Ahtasirate must be na-The first three time slots form a field ahead. ₅ o of course so great that the boil

which is described in more detail below. The last rhythm signal is an integral multiple of the

Ze.tschl.tz is used as Synchronisierfe d to define the sampling period (interval between two sampling pulses)

of the time frame end used. All the rest of the time is ^K

slots each correspond to a "channel" for cyclical if in a time frame rhythm information Transmission of coded speech or data. 55 is transmitted, contains the first time slot, so

where in every time frame per channel an information part of the address Λ, an all address This is

tion process (coded speech sample, or data _{- has the effect that all Te n} S _er . the η chfo -

by c) transmitted w.rd (synchronous transmission). take the data part D of the line and

Harvesting in advance, see b) in progress. This data part, i. h an ihySmus control F "G. 5 to see, st, can S.gnal.s.cnnformat.oncn 60 word, contains an identification field which indicates

or data together with an assigned that it is rhythm information (see c in

Address transmitted wcrd-n (as already in Fig. 5 above), as well as the group of the binary samples of all

mentioned Swiss patent 514 268, the hor signs SeIWtS R 1 used in the system

ben). The two time slots A and D correspond to Rl, L etc.). An empSive bin? Rhy hmu ^ together an asynchronous channel, which is always only 6 ₅ scanned each time so long has the next

for one multiplex cycle (i.e. a time group of ^ AbtasTwe th ^ is received in the vo-

frame) occupied w.rd and then a complete lying example 100 ms lane

"Message" (address plus data) transmits. The connections are illustrated again

6 illustrates: Rhythm information is transmitted together with a general address that appeals to all participants every 100 ms, that is to say in every SOOliZcitrahmcn, via a generally available channel, alternating with data and other signaling information. Samples of the Hörzcichen-Grüruitons are transmitted every 125 | is, that is, in each time frame like speech signals, on a special channel.

Facilities in the participant manufacturing c device 27 is input into a signaling decoder 41, which outputs control information to the controller 13. The signaling decoder 41 also generates the Rhythm control words for * Listen because these are also transmitted in time slot 2 and are marked as "Signalisierinfprmatipn". He emits corresponding control signals to the device for the regeneration of audio signals, now soft in detail is described.

^L , audio sign regeneration

In Fig.7 the receiving part is a subscriber part Shown in block form, in particular the device used to regenerate audio signals. The transmission part with microphone, speech coder,> 5, etc. is not shown because it is not necessary for the invention is of interest, and the control of the general functions of the subscriber station is only as an overall block 13 drawn. The control mainly outputs Zcitsignale71, 72, etc., which the time slot, so (1. i.e. specify the channel number of the data available in the receive buffer 15 or transmit buffer 17. It also gives control signals to individual linking devices.

mcrstcllc, and receives data from De- 25, the bistable flip-flops are Z1, Z 2, Z3 encoder of the receiving part. (43, 45, 47) provided. Their number corresponds to

Incoming data on the incoming line Number of intended audio signals (three in execution by means of an arc connection unit 11 according to the receiving example). When a subscriber creates a listening buffer 15 supplied. The data can be »received« by characters, this is done via the Si gate circuits G 19 to G 27 on different input channels through a corresponding code direction distributed depending on which word communicated. The signaling decoder 41 energizes

then one of the

To regenerate an audio signal, the following information is required in a subscriber station:

a) Identification of the audio signal;

b) Beginning and end of the time in which the audio signal is to be received;

c) rhythm information;

d) Fundamental tone (audible tone).

For the functions α and b, namely definition of the type and the reception duration of the listening time

Zcitschlitz (canal) they were taken from. If the subscriber station participates in a voice connection via a channel, the coded voice samples from each / th time slot are passed on by the time signal Ti via the gate circuit 19 to a voice buffer 29. The value / is entered into the control unit 13 when a connection is set up, so that it activates the control line 31 to the gate switch 19 every time data from the / th time slot is present. The stored voice samples are converted back into analog voice signals by a digital-to-analog converter 33, which are fed to the earpiece of the microphone.

Signals from the sub-multiplex channel of the advance fcldcs (Access slots 1 and 2 in Fig. 5) are distributed by the gate circuits 21 and 23. In the first Time slot (time signal 71) appears one at a time Address which is fed to an address detector 35. If the own address of the subscriber in question or receive a general address a long continuous signal / 177 appears on line 37. In the next time slot

35

4 » neten lines and sets one of the bistable flip-flops Z1 to Z3. As long as this toggle remains set, the assigned audio signal is »received«. As soon as the subscriber station receives a code word "Hörzeichen Stop" via the signaling channel, all toggle links are reset via the reset line 49. The reset can also take place via the line 51 by a signal generated by the Tciinehmerstelle itself, z. B. when placing the microtelephones.

Each time the subscriber station receives a rhythm control word as shown in FIG. 5, the output lines of the signaling decoder 41, which are labeled "rhythm information" in FIG . 7, are excited in accordance with the received bit pattern (the audio signal corresponding to bit R 4 is not for the subscriber station shown in FIG intended). The received sampling bits of all rhythm signals are then fed individually to the AND gates 53, 55 and 57. Since the other inputs of these AND gates are connected to the outputs of the bistable flip-flops 43 to 47

g ppg

(Time signal 7 2) if the data or the signals are 55, only the rhythm sample is sent to the i i d d hhl ORGlid 59 d d h

Sierinformation, which together with the address just received, formed a message, let through by the gate circuit 23 (an AND operation is carried out for the control signals 7 2 and ATT). In the case of data, a control signal "DATA" opens the gate circuit 25 to the data buffer 39, from where the received data is sent to a data sink, e.g. B. a card punch or a printing device, which is connected to the Tcilneh merge advises. can be passed on.

However, when signal identification information is received (control signal "SIGN." to gate circuit 27), sn are the bits from Zcilschlitz 2 downstream of the gate scarf OR gate 59, which corresponds to the preselected command.

The output of the OR gate 59 is connected to the setting input of a bistable trigger element 61. This flip-flop is initially reset when each rhythm control word is received, and by a signal on the output line 63 of the signaling decoder 41. Immediately thereafter takes the flip-flop 61, controlled by the output signal of the OR gate 59, a state one corresponding to the selected rhythm sample bit just received (i.e., it becomes either set to I or left at 0). On the exit

709625/383

line 65 of the bistable flip-flop 61 appears a square-wave signal which corresponds to the rhythm signal of the selected audible signal according to FIG. 2 (at most there is a slight phase shift). The information α, b and c listed earlier in this section is thus available. This rhythm information is used to influence the root note.

A fundamental tone sample appears each time in the third time slot of a time frame (see FIG. 5) at the output of the receiving buffer 15 (FIG. 7) and thus also at the input of the gate circuit 19. This gate circuit is set up so that it either is opened when there is an active signal on the control line 31, or when an active signal is present on the control lines 65 and 67 at the same time (AND function). The line 65 carries the rhythm signal ■ of the selected audio signal; the line 67 receives a time signal Ti from the controller 13 which corresponds to the time slot 3. Thus, the gate circuit 19 forwards the basic tone samples to the speech buffer 29 only when the rhythm signal is equal to one. The complete audio signal is restored as an analog signal via the digital-to-analog converter 33 and fed to the microphone receiver.

The audio signal could of course also be provided to a loudspeaker or the like via a speaker provided for this purpose Gate circuit are supplied.

If the keynote tone is not transmitted in coded form in a special channel, but is

is generated, it can just as easily be switched on or off by the control signal on line 65.

For ring signals, a selected rhythm signal is regenerated as described above. However, will the keynote distributed in coded form is mostly not used for callsigns. Instead, it becomes the selected one Rhythm signal on line 65 is used to trigger a buzzer, lamp or the like ^ Switch the device on and off.

summary

With the described invention in time division multiplex telecommunications systems Audible signal or call

signals are transmitted in digital form to the participants in a simple manner. During the simple audio signal transmission, no voice channel connection needs to exist to the relevant subscriber station; no special switching devices are required for this purpose. It is only necessary to provide a signaling channel common to all subscribers, for example in sub-multiplex operation.
The input of activation signals in a best

There is an ongoing voice connection in spite of the coded language representation easily possible, since speech signals and audio signals are transmitted separately.

The change of any licensing mark or the entire set of audio signals is easily possible,

if an adjustment to new conditions becomes necessary.

For this purpose 3 sheets of drawings

Claims (14)

Claims; 1. A method for distributing audible signals and ringing signals to subscriber stations in a time division multiplex communication system, characterized in that binary samples (R I to Rk, Fi g. 3, 5 c) of the rhythm signals of all audible signals and ringing signals are constantly accessible via a common available to all subscriber stations -Samen time multiplex kaiial (Fig.5c) are transmitted, with all samples belonging to a sampling time are summarized in a rhythm control word (Fig.5c), and that a subscriber station itself a temporarily required audible signal or call signal, after receiving a corresponding instruction generated by evaluating the rhythm control words received and influencing an independently distributed or locally generated basic signal with a regenerated rhythm signal (65, FIG. 7). 2. The method according to claim 1, characterized by a multiple channels (fields) containing pre-field in the time division multiplex frame (Fig.5), which in a first field (A) an individual subscriber address or a valid general address for all subscribers, in a second field (D) transmits data or signaling information for the individual participants and in a third field (F) a basic tone (FIG. 1 d) common to all audio signals. _; , 3. The method according to claim 2, characterized in that the iRhythm control word is transmitted in the second field (D), which is derived from an identification of the rhythm information itself, as well as from individual bits (R 1 to R 4) representing the sampled values of the various rhythm signals. consists. 4. The method according to claim 1, characterized in that the common keynote of all Audio character is sampled and coded centrally, and that the code words, which the sampled values represent, distributed over a time division multiplex channel (F, FIG. 5b) specially provided for this purpose to which all subscriber stations always have access. 5. The method according to claim 1, characterized in that the rhythm control word in each η-th time frame is transmitted, where the ratio η between the sampling period for the rhythm signals and the time division frame period is so chosen. that the period of each of the rhythm signals is an integral multiple is the sampling period. 6. The method according to claim 3, characterized in that the rhythm control words are distributed over a sub-time division multiplex channel common to the first and second fields, which is intended for the transmission of messages, each having a data unit (D) and an assigned address (A) included, and that each rhythm control word is accompanied in the transmission by a general address which applies to all subscriber stations. 7. The method according to claim 1, characterized in that that the rhythm information for the ringing tone in a called subscriber station a local signal generator is used for this switch it on and off in such a way that the required ringing signal is generated, 8. The method according to claim, characterized in, that the beginning and the end of the reception of an audio signal from a subscriber station be communicated by a suitable code word sent in the second field, 9. The method according to claim 3, characterized in that the address in the first field also contains a control bit (S / D) which indicates whether data or signaling information is being sent in the second field. 10. The method according to claims, characterized in, that the code word, which indicates the beginning of the reception of an audio signal, also the type of audio signal (Fig. 2 a to 2 c) indicates. 11. Arrangement for the distribution of audio signals and ringing signals, in particular for performing the method according to the preceding claims, characterized by a connection unit (11) with a receiving buffer (15) for receiving the time frame information in the subscriber station (F i g. 7), by a Address detector (35) which, upon receipt of its own address or the general address, supplies a control signal (37) for receiving the subsequent data or signaling information, as well as a distinguishing signal (S / D) which provides information about corresponding gate circuits (25 or 27), which are controlled by the distinction signal, are stored in a data buffer (39) or in a Signalisisr decoder (41), the signaling decoder (41) controlling the generation of a selected, regenerated rhythm signal via logic circuits (43 to 61) , as well as control signals to a control and timing circuit (13) of the subscriber station. 12. The arrangement according to claim 11, characterized in that a toggle switch (43, 45, 47) is provided for each audio signal used, which is set by a code word defining the beginning and the type of the audio signal ("audio signal selection") and with an input of an associated AND gate (53, 55, 57) is connected, the other input of which receives the rhythm signals (R 1 to R 3), and that the outputs of the AND gates control an OR gate (59) whose Output signal sets a flip-flop (61) for generating the regenerated rhythm signal. 13. Arrangement according to claim 12, characterized in that that the flip-flop (61) is reset upon receipt of each rhythm control word and that the output signal (65) of the flip-flop is optionally a subscriber-specific Indicator (buzzer or lamp) controls, or the reception of the basic audible tone (Fig. 1 d). 14. Arrangement according to claim 13, characterized in that the voice receiving devices (gate 19, voice buffer 29, D / A converter 33) of the subscriber station are used to receive the audible signal base tone, the voice reception gate (19) from the clock pulse (T 3) of the third field of the preceding field in which the keynote is transmitted, together with the output signal! the toggle switch ((A) is opened, 15, arrangement according to claim 1 ?, characterized in that that the flip-flops (43, 45, 47) both when receiving a code word that indicating the end of the reception of a Hörzeicliens, as well as by a from the subscriber station self-generated signal (z, B, laying on of hand) ükll d i the control devices of the connected subscribers can be removed. The inventive method for solving this problem is in the characterizing part of the main claim marked, D'iC '«Urfindung InH has the advantage of being able to transmit of the audio signal, a transmission channel is not required for each connection. So the canals following the methods used hitherto apparatcs) (lines 49, 10 der'Äffend ^ or 51). characters and ring signals were required, can now be used for voice transmission, By giving the audio signals to all participants