KR0182638B1 - Abnormal signal detecting method for full electronic switching system - Google Patents

Abstract

The present invention relates to a method for detecting a relay signal and an abnormal signal having two frequencies in an all-electronic exchange. Since the conventional technology does not have an abnormal signal detection function, there is a drawback that the state of the relay signal is abnormal due to the noise on the line and the adverse effect of the environment during the transmission of the relay signal during the switching period, thereby failing to satisfy the specification. Accordingly, in the present invention, the relay signal and the abnormal signal having two frequencies can be detected to enable complete signal processing. Therefore, there is an effect that the reception capability of the relay signal of the all-electronic exchange is improved.

Description

Abnormal signal detection method of all electronic switch

1 is a block diagram showing an embodiment of an inter-station relay signal detector of an all-electronic exchanger according to the prior art.

2 is a flow chart showing step by step an embodiment of the inter-station relay signal detection according to FIG.

FIG. 3 is a flowchart showing step by step an embodiment of a processing procedure of the level comparator of FIG.

FIG. 4 is a flowchart showing step by step an embodiment of a processing procedure of the signal presence determiner of FIG.

5 is a block diagram showing an embodiment of an inter-station relay signal detector of an electronic switching system according to the present invention.

6 is a flowchart showing step by step an embodiment of the inter-station relay signal detection according to FIG.

FIG. 7 is a flowchart showing step by step an embodiment of a processing procedure of the normal signal determiner of FIG.

* Explanation of symbols for main parts of the drawings

16: 700 Hz filter 17: 900 Hz filter

18: 1100Hz Filter 19: 1300Hz Filter

20: 1500 Hz Filter 21: 1700 Hz Filter

22 to 27: level comparator 28: signal presence determiner

29: normal signal determiner 30: receiving digit output unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an abnormal signal of an all-electronic exchange, and more particularly to a method for detecting a relay signal and an abnormal signal having two frequencies in an all-electronic exchange.

1 is a block diagram showing an embodiment of an inter-station relay signal detector of an all-electronic exchanger according to the prior art, and includes a 700 Hz filter (1), a 900 Hz filter (2), a 1100 Hz filter (3), a 1300 Hz filter (4), and 1500 Hz. It consists of a filter 5, a 1700 Hz filter 6, a plurality of level comparators 7 to 12, a signal presence determiner 13, a normal signal determiner 14, and a receive digit output unit 15.

In the figure, the 700 Hz filter (1), 900 Hz filter (2), 1100 Hz filter (3), 1300 Hz filter (4), 1500 Hz filter (5), and 1700 Hz filter (6) input a relay signal from another station ( 2 202). Thereafter, each of the filters 1 to 6 filters and outputs each of the frequencies of 700 Hz, 900 Hz, 1100 Hz, 1300 Hz, 1500 Hz, and 1700 Hz, respectively (L1 to L6) (FIG. 204).

Next, each level comparator 7 to 12 level compares the respective outputs L1 to L6 of the respective filters 1 to 6, respectively, and outputs the comparison results (C1 to C6) (FIG. 206).

Further, the signal presence determiner 13 receives the outputs C1 to C6 of the level comparators 7 to 12 and the respective outputs L1 to L6 of the filters 1 to 6, respectively, and determines whether there is a signal. (Figure 2 208). Accordingly, the signal presence determiner 13 outputs HL1, HL2, and HL3 by sorting the frequencies according to the level magnitudes when there is a signal as a result of the determination (FIG. 210). On the other hand, the signal presence determiner 13 outputs no signal A0H when there is no signal as a result of the determination (FIG. 216).

After the step (FIG. 2210), the normal signal determiner 14 determines whether the signal is normal according to the outputs HL1, HL2, HL3 of the signal presence determiner 13 (FIG. 212). ). Thus, the normal signal determiner 14 outputs the normal signal A1-AFH if it is the normal signal (FIG. 214). On the other hand, the normal signal determiner 14 outputs no signal A0H if it is not a normal signal as a result of the determination (FIG. 216).

Subsequently, the reception digit output unit 15 outputs the reception digits A0-AFH in accordance with the outputs of the normal signal determiner 14 and the signal presence determiner 13 (FIG. 218).

3 is a flow chart showing step by step an embodiment of a processing procedure of the level comparator of FIG.

First, each level comparator 7 to 12 inputs the level L1 to L6 for each frequency output from each filter 1 to 6 (502). Next, each level comparator 7 to 12 compares each frequency level L1 to L6 with a defined highest level (504). Further, each level comparator 7 to 12 compares each frequency level L1 to L6 with a prescribed minimum level (506). Thereafter, among the outputs C1 to C6 of the level comparators 7 to 12, the output included in the range of the highest level and the lowest level is set to 1 (508). Then, an output not included in the range of the highest level or the lowest level is set to 0 (510). The level for the next frequency is then compared in the same manner as above (512).

4 is a flowchart showing step by step an embodiment of a processing procedure of the signal presence determiner of FIG.

First, the signal presence determiner 13 receives each output C1 to C6 of each level comparator 7 to 12 (602). Next, the signal presence determiner 13 checks whether the sum of the respective outputs C1 to C6 is two or more (604). Accordingly, if the sum of the outputs (C1 to C6) is 2 or more, the signal presence determiner 13 sorts the level for each frequency in order of magnitude, makes the highest high level HL1, the second high level HL2, The third high level is set as HL3 to the normal signal determiner 14 (606). The normal signal determiner 14 then drives 608 a normal signal determination routine.

In contrast, the signal presence determiner 13 determines that there is no signal when the sum of the respective outputs C1 to C6 of the respective level comparators 7 to 12 is less than 2 in the step 604, and there is no signal. (A0H) is output (610). The signal presence determiner 13 then processes the next signal (612).

In addition, the normal signal determiner 14 determines whether the level deviations HL1 to HL2 between the two frequencies constituting the signal are less than a prescribed value, and the level deviations HL2 to HL3 between the two frequencies constituting the signal and other frequencies. Determine if is above the specified value. Thus, the normal signal determiner 14 determines that the signal is a normal signal when the above prescribed value condition is satisfied. Therefore, the normal signal determiner 14 outputs digital information A1H to AFH composed of two frequencies, and then processes the next input signal. On the other hand, the normal signal determiner 14 determines that there is no signal when the above prescribed value condition is not satisfied. Therefore, the normal signal determiner 14 outputs the no-signal digital information A0H, and then processes the next input signal.

However, such a conventional technology does not have an abnormal signal detection function, and therefore, the condition of the relay signal may be abnormal due to noise on the line and adverse effects of the environment during transmission of the relay signal during the exchange period, thereby failing to satisfy the specification. At this time, the called side exchange determines that the relay signal is not received and forcibly terminates the reception of the relay signal. Or, the destination side exchange processes a part of the destination information is missing, so there is a defect that the signal according to the destination is abnormally processed.

SUMMARY OF THE INVENTION The present invention has been made to solve such drawbacks of the prior art, and provides an abnormal signal detecting method of an all-electronic exchanger capable of detecting a relay signal and an abnormal signal having two frequencies and performing complete signal processing. The purpose is.

In order to achieve the above object, the present invention provides a method for receiving a relay signal having two frequencies of an all-electronic exchanger; A first step of determining whether a level deviation between two frequencies constituting the received relay signal is less than a prescribed value; A second step of determining whether a level deviation between two frequencies constituting the received relay signal and other frequencies according to other signals is greater than a prescribed value; A third step of determining that the relay signal is normally received when the first and second determination conditions are satisfied; Outputting normal signal digital information indicating receipt of the normal relay signal; A fifth step of determining that the relay signal is abnormally received if any of the determination conditions of the first and second steps are not satisfied; And outputting abnormal signal digital information indicating reception of the abnormal relay signal.

Hereinafter, described in detail by the accompanying drawings an embodiment of the present invention as follows.

5 is a block diagram showing an embodiment of an inter-station relay signal detector of an all-electronic exchange according to the present invention, and includes a 700 Hz filter 16, a 900 Hz filter 17, a 1100 Hz filter 18, a 1300 Hz filter 19, and a 1500 Hz filter. 20, a 1700 Hz filter 21, each level comparator 22 to 27, a signal presence determiner 28, a normal signal determiner 29, and a receive digit output unit 30.

In the figure, the 700 Hz filter 16, the 900 Hz filter 17, the 1100 Hz filter 18, the 1300 Hz filter 19, the 1500 Hz filter 20, and the 1700 Hz filter 21 input a relay signal from another station ( 6, 402). Next, each 700Hz filter 16, 900Hz filter 17, 1100Hz filter 18, 1300Hz filter 19, 1500Hz filter 20, and 1700Hz filter 21 to input the input relay signal 700Hz, 900Hz, Each of the frequencies of 1100 Hz, 1300 Hz, 1500 Hz, and 1700 Hz is filtered 404 and output for each frequency (L1 to L6) (FIG. 6 404).

Each level comparator 22 to 27 performs a level comparison of the respective outputs L1 to L6 of the respective filters 16 to 21, respectively, and outputs each comparison result (C1 to C6) (FIG. 406).

Subsequently, the signal presence determiner 28 receives the outputs C1 to C6 of the level comparators 22 to 27 and the outputs L1 to L6 of the respective filters 16 to 21, respectively, and determines whether there is a signal ( 6 (408). Accordingly, the signal presence determiner 28 aligns the frequency according to the level size (HL1, HL2, HL3) when there is a signal as a result of the determination of the above step (FIG. 6 408) (FIG. 6 410). On the other hand, the signal presence determiner 28 outputs no signal A0H when there is no signal as a result of the determination of the above step (FIG. 6 408) (FIG. 6 418). That is, the signal presence determiner 28 receives the outputs C1 to C6 of the level comparators 22 to 27 and checks whether the sum is two or more. Therefore, when the sum is 2 or more, the level for each frequency is sorted in order of magnitude so that the largest level is HL1, the second largest level is HL2, and the third largest level is HL3 to the normal signal determiner 29. to provide. On the contrary, if the sum of the outputs C1 to C6 of the level comparators 22 to 27 is less than 2 as a result of the determination of the step (Fig. 6, step 408), it is determined that there is no signal and no signal digital information A0H Outputs and processes the next signal.

Next, the normal signal determiner 29 determines whether the signal is normal according to the determination of the signal presence determiner 28 (Fig. 6, 412). Thus, the normal signal determiner 29 outputs normal digit information A1-AFH if it is a normal signal (Fig. 6 414). In contrast, the normal signal determiner 29 outputs abnormal digit information B0H if it is an abnormal signal (Fig. 6, 416). Subsequently, the normal signal determiner 29 processes the next signal (Fig. 6, 420).

In addition, the reception digit output unit 30 outputs each received digit through one transmission path in accordance with the determination of the normal signal determiner 29 and the signal presence determiner 28.

7 is a flowchart showing step by step an embodiment of a processing procedure of the normal signal determiner of FIG.

First, the normal signal determiner 29 outputs a signal (the outputs HL1, HL2, HL3 of the signal presence determiner 28, the maximum value (DELTA L1) of the level deviation between the two frequencies constituting the relay signal, and the relay signal. The minimum value DELTA L2 of the level deviation between two constituent frequencies and the remaining frequencies is received (702). Next, the normal signal determiner 29 determines whether the level deviations HL1 to HL2 between the two frequencies constituting the relay signal are equal to or less than the prescribed value DELTA L1 (704). The normal signal determiner 29 determines whether the level deviation HL2 to HL3 between the two frequencies constituting the relay signal and the other frequencies is greater than or equal to the prescribed value DELTA L2 (706). If the two conditions of steps 704 and 706 are satisfied, it is determined as a normal signal and outputs normal signal digital information A1H to AFH consisting of two frequencies (708 and 710). On the other hand, if any one of the two conditions of the steps 704 and 706 is not satisfied, it is determined as an abnormal signal and outputs the abnormal signal digital information B0H (712 and 714). Then, the next signal is processed. (716).

As described above, the present invention enables the complete signal processing by detecting a relay signal and an abnormal signal having two frequencies. Therefore, there is an effect that the reception capability of the relay signal of the all-electronic exchange is improved.

Claims (1)

A method for receiving a relay signal having two frequencies of an all-electronic exchange; The reception degree is a first step of determining whether the level deviation between the two frequencies constituting the relay signal is less than the prescribed value; A second step of determining whether a level deviation between two frequencies constituting the received relay signal and other frequencies different from the other signals is greater than a prescribed value; A third step of determining that the relay signal is normally received when the first and second determination conditions are satisfied; Outputting normal signal digital information indicating receipt of the normal relay signal; A fifth step of determining that the relay signal is abnormally received if any of the first and second determination conditions are not satisfied; And a sixth step of outputting abnormal signal digital information indicating reception of the abnormal relay signal.