Audible tone and voice announcing generator for digital telecommunication exchanges, especially for telephone exchanges.

p0001The invention relates to a Hörton- and voice message generator for digital telecommunications, in particular telephone exchanges according to the preamble of claim 1. From DE-OS 34 23 818, a digital generator to be fed into a PCM time multiplex telecommunication, particularly a telephone system, acoustic signals is known. There besides the sound or voice memories containing the PCM words more counting and storage devices are provided, wherein each counter a memory or buffer is assigned. The linkage of the individual memory or counter outputs to addresses for the actuation of the audio memory or the speech memory is relatively complicated. In addition, a special address counter with a downstream address buffer is required to advance the individual addressing of the audio memory of the speech memory or to the next PCM-word. Through the diversity of counters, memories and logic devices, it is not possible to carry out this digital generator space.

p0002The object of the invention is to present a Hörton- and voice message generator for digital telecommunications, in particular telephone exchange systems, the memory array and the mode of addressing are uniform, so that a clear simple wiring and connection is possible, and only a few individual components are required ,

p0003This object is achieved with a combination of features as set forth in claim. 1

p0004This is achieved in an advantageous manner that all counting and logic devices that are required except at least one programmable read only memory, can be implemented in a uniform structure so that they can be summarized in a single highly integrated circuit. The assembly of dial tones and their rhythms are formed exclusively by programming a single dedicated programmable read only memory. It is a very wide variation possible in the combination of sound frequencies and rhythms. The need for voice prompts PCM words can be either in still existing capacity in the audio memory to accommodate, or requiring a separate memory chip used. Further developments of the invention result from the dependent claims.

p0005An embodiment of the invention is explained in detail with reference to drawings. It shows:<ul><li>FIG. 1 shows the block diagram of the entire Hörton- and voice message generator.</li><li>FIG. 2 shows an overview of the storage areas in the programmable read only memory.</li><li>FIG. 3 is a representation in the row contents in the timing area.</li><li>Fig. 4 shows the detail view of a counter.</li></ul> In FIG. 1, a clock generator TG is shown, which supplies a control unit SE with clocks and the individual counting devices ZL-ZE, ZE-RT, T-S-Aze AZE and controls with individual timings ZT. The outputs of these counters are connected to the inputs of the multiplexer MUX. The outputs of this multiplexer MUX lead as address lines AL to Adressiereingängen the programmable read only memory PROM.

p0006The time slot counter ZL-ZE is a corresponding to timing intervals count clock ZT counted so that the programmable read only memory PROM a the respective time slot allocated memory area can be addressed. Regardless of the rhythm counter RT-ZE is advanced continuously with a slower clock ZT. Within the available for a timing period now takes on the following states: During a first phase, the multiplexer MUX by the control device SE is adjusted so that the outputs of both the time slot counter ZL-ZE and the outputs of the rhythm counter RT- ZE will be appearing on the address lines AL. Thereafter, a particular memory line is driven in the portion of the timing range ZL-B in the programmable read only memory PROM which corresponds to the position of the time slot counter ZL-ZE. It is assumed that the said line of memory, for example, in the time slot 1, ZL1 in Fig. 2, located.

p0007As the contents of such a memory line may look like, is shown in Fig. 3. The individual addressing of rows is done according to the setting of the rhythm counter RT-ZE. In which in the example starting with a row Z1.1 portion within the assigned for the time slot ZL1 range is a number of memory lines, that describe in this example by their similar content the transmission of a certain audio frequency TON1 for a predetermined period of time. It is predicated that entered in a column D7 bit (in this example 0), that it at all is a sound emission and not a voice message. In the case of voice message would be a 1 is entered in the corresponding column, as shown below in FIG. 3.

p0008In the example, four additional columns (D0 to D3) are provided, which in binary code, the type of sound or the nature of the voice message can be set. So if so are four bits for the individual selection of the to be transmitted tone of a predetermined frequency or a voice message is available, up to 16 different sounds and deviated more 16 different voice prompts may be present.

p0009Because it is most audible tones required that predetermined intervals are present, and also because it may be expedient to insert pauses between the individual voice prompts, a bit combination within the tone range TON-B in Fig. 2 is provided for displaying a pause. As can be seen from Fig. 3, this range is indicated by the bit combination Tonn hexadecimal 15th

p0010In the example shown in Fig. 3, it is assumed that within the time slot 1, a call progress tone is programmed, the consists of two frequencies TON1 and TON2 and pauses therebetween. At each step, the rhythm counter RT-ZE the timing ZL1 assigned area throughout, each driven to the next memory line in the programmable read only memory PROM.

p0011The same applies to the remaining time slots, such as shown in Fig. 3. Accordingly, in the beginning with a line Z2.1 range of timing 2 ZL2 an audible tone would programmed, which has only one frequency and having predetermined intervals. Further down in FIG. 3 is shown that in a different time slot, for example, ISN-1 is to be a voice message, in the example SPR5. ISN is In another time slot carried the example according to another voice message SPR4. For voice prompts is to discriminate against audible tones, as already mentioned, the D7 existing bits described in the column with a first

p0012Thus, if a particular line within this time slot, for example, ZL1, the allocated area has been controlled in the above-described manner within the first phase of each time slot, the contents of this line as shown in Fig. 3 is read out and the control unit SE supplied. The contents of the first phase read from the programmable read only memory line is temporarily stored in the controller. Now the multiplexer MUX is set according to a second phase, depending on whether it is a Hörtoneinblendung or whether it is a voice announcement. It get so either the outputs of the sound Abtastzähleinrichtung T-AZE or the outputs of the counter-Sprachabtast S-AZE via the multiplexer to the address lines AL. Then there are the read-in phase 1 bits of those columns in the example D0 to D3 which a very specific sound storing, eg SOUND1 to a very specific voice storage area, eg SPR4 identify. It is then performed during the second phase within each time slot addressing a particular line within the Tonspeicherbreiches TON-B or within the voice memory area SPR-B. The range addressing is done with the data read in the first phase bits and the individual addressing is done according to the position of either the T-Aze ​​Tonabtastzähleinrichtung or Sprachabtastzähleinrichtung S-AZE. The output of the programmable read only memory data lines DL are connected, which the read out word in the first phase, as shown in Fig. 3, performing the control unit SE. At these data lines, a parallel-serial converter P / S is connected, whereas the in the second phase coming from one row in the sound storing TON-B or in the voice memory area SPR-B PCM word arrives. Here it is converted in parallel-serial in a known manner and passes to the output A of the PCM and Hörton- voice message generator.

p0013In order to adapt the Hörton- and voice message generator for all applications optimally, a special memory area A-B is provided for setting information within the programmable read only memory PROM. There of each counter associated with particular memory lines provided. This memory area A-B is driven by a special addressing each to start up the Hörton- and voice message generator. This is done by applying a predetermined code is applied on special connections intended for MOD. This will take the contents of these lines from this particular memory area A-B sequentially through the data lines DL to the control device SE. From there, they are also successively the individual counting devices ZE offered in parallel. In FIG. 4 is shown how this information can be included in the individual counting devices ZE. In the counting means ZE buffer AA, EA are provided for receiving in each case an initial address and / or an end address. If both a start address and an end address have been entered into the respective buffer memory AA and EA, the counting clock pulse ZT controlled by the counter ZÄ eventually reaches a counter position which corresponds to the contents of the buffer for the end address EA. This is detected by a comparator VG, which then outputs a pulse to the buffer memory for the start address AA. The contents of the buffer memory for the start address AA is parallel loaded into the counter ZÄ.

p0014It is also conceivable that the counter decoding is connected, so that is reset to an initial value when it reaches a predetermined fixed end position of the counter ZÄ. It is then unnecessary to transmit also an end address EA. Such measures will be achieved, that is selected from the total count capacity only a predetermined portion so that the number of steps is well defined and thus in connection with the frequency of the counting clock ZT, the cycle time can be determined.

p0015With such a configuration, the counting device ZE, it is possible in the Zeitlagenzähleinrichtung ZL-ZE predetermine the number of time slots ZL, to be awarded for the feeding of audible tones and voice prompts. When Rhythmuszähleinrichtung RT-ZE, the cycle time depends on the common multiple of all audible tones and / or voice prompts. The number of steps depends on how accurate Hörtonzeiten and break times to be defined. It can also, as already described, this more accurate in that the count clock in a higher frequency, for example, instead of the 10-ms spacing is offered in 20-ms distance. With a faster count clock must of course also be increased the number of steps if longer operating time are to be realized.

p0016When Tonabtastzähleinrichtung T-Aze ​​and the Sprachabtastzähleinrichtung S-Aze a counting pulse at a distance of 125 microseconds is required because the sampling rate is well known, is 8 kHz, the period of time and thus the number of counts is based on the Tonabtastzähleinrichtung T-Aze ​​after common multiple of the period of all existing Hörtonfrequenzen. And according to the accuracy that should have these frequencies. When Sprachabtastzähleinrichtung S-AZE 8000 steps are in accordance with the sampling per second voice message needed because the entire voice band 300-3400 Hz, as it is standardized for the telephone channel, must be available. Because of this reason for the speech in relation much more storage space must be available, it is expedient to provide separate memory chips for voice prompts.

p0017With the arrangement of the counting devices ZE and the layout of the programmable read only memory PROM, it is possible to realize all occurring in a telephone system audible tones and their rhythms. In addition, various voice prompts are possible, which can also be combined with audible tones, as is the case for example in the known advisory, which consists of 3 frequencies and a voice announcement. In addition, also all conceivable special requests can be fulfilled.