DE3427010A1 - Method for detecting and evaluating acoustic detonation signals, and an arrangement for carrying out the method - Google Patents

Abstract

In order to detect and evaluate acoustic detonation signals which are subject to interference and occur when a round leaves the barrel mouth or strikes a target, the interference signal which occurs at the same time is subjected to formation of an average value by means of an average-value forming device, especially a median-value forming device. The median of the amplitude values occurring within a time interval DELTA tau corresponds to the interference signal level existing in the received signal and is used for calculating an adaptive threshold. If this threshold is exceeded by the detonation signal which is subject to interference, for a predetermined time interval DELTA tau , then this received signal is interpreted as the real detonation signal. Detection of the length of the detonation signal allows the analysis interval to be shortened without loss of information. Furthermore, received detonation signals which occur shortly after one another in time can still be resolved and evaluated.

Description

Writing

Process for the acquisition and evaluation of acoustic bang signals and arrangement for carrying out the method. The invention relates to a method and an arrangement for performing the method according to the preambles of the claims 1, 4 and 5, 6.

The invention is based on the object of providing a method ulld oiiio Arrangement to findoij, thus acoustic, by disturbances, especially by wind noise falsified bang signals can be detected when leaving the mouth or occur when a bullet hits the target, for example. Interfering signals such as Wind noise, vehicle noise and projectile cracks should be avoided this Pop signals can be distinguished.

In particular, with the help of this method and this arrangement the acquisition of the current bang length shortens the analysis interval without any loss of information, so that the briefly consecutive received bang signals can still be resolved and evaluated or the following Signal processing is relieved of time due to the smaller amount of data per bang. Furthermore, the arrangement should be realizable in integrated circuit technology and the condition of high shock resistance and low power consumption fulfill.

This task is carried out by the characterizing process steps and Features of claims 1, 4 and 5, 6 solved in an advantageous manner. More beneficial Refinements and developments can be found in the subclaims.

An embodiment of the invention is shown in the drawing and is described in more detail below: FIG. 1 Basic arrangement for separate Detection of the occurring interfering signal and the noisy bang signal as well as to determine the duration of the bang; FIG. 2 digital embodiment of the in FIG. 1 shown arrangement; FIG. 3a) Interference signal detection by means of Median value formation with determination of the start and end of the bang signal; b) refinements and further education; FIG. 4 exemplary embodiment of one which determines the start of the bang signal and the detection unit determining the end of the pop signal.

For recording and evaluating, for example, when leaving the muzzle or when a bullet hits the acoustic bang show a great variety of appearance and are often noisy especially falsified by wind noise. That's why it's for better resolution successive bang signals the analysis interval within which the bang signal is to be detected to adapt to the current bang length.

The received interfering signals are preferably separated from the interfering signals Detected pop signals, for example by the fact that the received signal amplitude spectrum on the one hand an averaging is subjected in such a way that the short-term bang signals in the averaging, which are subject to a Gaussian distribution, for example, and are decorrelated, essentially, the undesired interference signals are not received. Due to the separate detection of the occurring interference signal level in the form of an ont # proclloledon Mittolwortos and dos noisy bang can be. then from the moment Amplitude comparison of these signals, preferably by means of one with one of the averaged Interference signal-dependent threshold provided comparator 2, the presence of a pop signal determine. A noisy bang signal is expected preferably then present when a specified interference signal level is exceeded with a specified Frequency occurs for a predetermined length of time Jt.

FIG. 1 shows schematically an advantageous arrangement for implementation of the procedure. There, the received acoustic signal AS is preferably turned into a corresponding electrical signal ES in a mechano-electrical converter 11 for example a microphone.

This electrical signal ES is preferably one input EI the amplitude comparison unit 2 directly and the other input E2 only after the Averaging in the averaging unit 3 is supplied for comparison.

The comparison unit 2 then provides an output signal SV when the Input value of one input EI of the comparator by a detection distance of Interfering signal and noisy bang signal exceeds the determining value (exceeded the threshold value applied to the other input E2 by a specified value). From the duration of the existing output signal of the comparator 2 in a predetermined The time interval can then advantageously be used in a subsequent time measuring unit 4 derive another plausibility check if the length of the Bang signal is known. The start of the bang signal is preferably the result from the orsLRlaligol, overriding dos at the other input E2 of the comparator K2 applied threshold value by a predetermined value, the end of the pop signal, for example from the point in time when the threshold value is not reached by a specified value Value within a specified time interval. Preferably the duration is one Half-wave of the bang signal determined.

In FIG. 2 is a substantially digitized embodiment the arrangement according to the invention is shown.

The received acoustic signal AS is preferably by the mechano-electrical Converter 1, for example by means of a microphone and a subsequent amplifier, band pass filtered. The corner frequencies are, for example, 5 Hz and 100 Hz. On downstream A / D converter 5 samples the electrical output signal of the mechanoelectric Converter 1 with its predetermined sampling frequency fT of preferably 512 Hz and puts the samples Xi in parallel with an accuracy of 12 bits, for example the following circuit unit is available.

The samples Xi are preferably in a rectifier G before the mean value and comparison formation in the comparator K5 rectified.

The current output value in parallel and in binary form X. of the A / D converter 5 is preferably on the one hand the one input E3 of the Comparator K1 and on the other hand via an averaging 6, which is essentially detects the interference signal components and suppresses the pop signal components and its output signal represents a measure for the occurring interference signal component, via its (for example 12 bit) parallel outputs are fed to the other input E4 of the comparator KI.

The comparator K1 then preferably supplies an output trigger AK7 if the singallgsword ani an input 63 of the averaged interference signal level input value at the other input E4 of the comparator by a predetermined detection distance of the interfering signal and the noisy bang signal level exceeds the determining value.

To distinguish the real bang signals from the false ones is preferred the length of the bang signal is also determined. The beginning of a bang is characterized by a rapid increase in the signal, i.e. in a certain time interval the received signal is well above the threshold that is reflected in the interference signal (background noise) oriented.

A time interval is advantageously established by means of the time measuring unit 7 considered that the duration of the first half-wave of a bang to be detected is adapted.

For example, if the length of time of the half-wave of the received Bang signal a predetermined time at which is dependent on the bang signal to be detected occurs for a long time, the received signal is interpreted as a real bang signal.

To ensure an accurate detection of the start and end of the bang signal to be able to carry out, the averaging signal components averaging becomes 6 implemented in the form of a median value generator 60 (see FIGS. 3a and 3b). At this Averaging short-term, high signal components are not recorded, so that the The median value formed is essentially a measure of the received interference signal components represents in the given time interval. This is done in an advantageous manner the median of the values of the samples is sought. A common procedure is based on the magnitudes of the samples of a suitable time period af according to size assign. An estimate of the median is then that in the middle of the sequence Sampling selected (sorting method). The determined The median value is present at the other input E4 of the comparator K1 until the im subsequent time interval t0 new median 0 value is determined.

To determine the start and end of the pop signal is the time measuring unit 7 with two detection units 8 and 9 and, for example, one subsequent gate circuit 10 equipped.

The output of the comparator K1 is preferably on the one hand with the the detection unit 8 determining the start of the bang signal and on the other hand with the the detection unit 9 determining the end of the bang signal is connected.

If, for example, the interference signal level at an input E4 of the comparator K1 is exceeded by several samples Y., the comparator supplies K1 an output signal for a time corresponding to the number of exceedances the one detection unit 8, which then sends a setting pulse for the downstream Gate circuit 10 supplies. The reset signal for the gate circuit 10 provides the another detection unit 9 when the signal end has occurred. That depends on The output signal AZ of the gate circuit 10 occurring during the signal duration is then preferably fed to a computing unit RE for further processing. Instead of the gate switch 10, a counter can be used, which is determined by the output signal of one detection unit 8 is reset and by the output signal of the other detection unit 9 is stopped by interrupting the counting cycle. The one at the time of the interruption The present value in the counter corresponds to the length of the received bang signal.

FIG. 3a shows an advantageous embodiment of the median value generator 60. Since, as described above, the sorting process is complex and computationally time-intensive, the current median value Mi is preferably calculated from the previous value Mi-r by multiplication with a correction factor F = 1-6 according to the rule ji In order to save computing time, the correction step is preferably only carried out with every r-th sample value jXi, for example r = 8. However, the currently determined median value changes within the r-th sampling interval according to the rule (1) given above, depending on the processing time of the median value generator 60.

Preferably, the averager 60 has the shortest possible processing time designed, for example, in such a way that it receives the binary received signals as much as possible processed in parallel. This processing time is when the time constant is selected Averaging to be taken into account. The estimated using this recursive method Median value M. follows level changes with a time constant of approximately r / sampling periods. The time constant is chosen, for example, to be about 1 sec. Is the input signal Gaussian distributed and decorrelated, the signal power is obtained from the median Multiplication by the factor 1.483.

There are two reasons why it makes sense not to keep the median value below a certain level To lower the barrier Mmin.

Firstly, a minimum height can be assumed for the useful signal, because otherwise the quantization noise will falsify a further evaluation would. The consequence of this is that there is always a certain minimum value can be accepted without complicating the signal detection. The second reason concerns the transient behavior of the median value determination when the background noise quickly rises to a medium value after a long period of rest. Would the median estimate is allowed to decrease to a very small value, unnecessarily long settling times can result.

For example, a minimum value of about 10, i.e. the median value Mmin does not fall below 6.74.

The median value is determined within a specified Samples occurring at the time interval t preferably with the aid of two comparators K2, K3, an encoder Ko and an (n + m) -bit multiplier M1 (see FIG. 3).

Advantageously, for example, to shorten the computation time only every r-th sample of the samples Yi to an input of the comparator K2 in 12 bits supplied in parallel form. This value is preferably r clocks on Input on until the next r-th sample. At the other input of the comparator K2 is the median value that occurred in the previous computing cycle. This Value corresponds to the output value of the averaging unit 60. If the r-th sample value at one input is greater than the median value previously determined, the comparator delivers K2 an output signal "i", in the opposite case "0t". Accordingly, the the comparator K2 downstream encoder Ko activated so that it has an output value F = 1-g, preferably in parallel binary form, if the r-th sample | Xi | lxii r Mir and yields F = 1 + 6, if the amount is frii> It is ... with me. This starting value is subsequently changed to the previously determined median value M.

i-r multiplied in an (n + m) -bit multiplier Ml. The result corresponds to the new median value M. for the next median value formation. The current Sampling value at one input of the comparator K2 remains within r samples here constant.

The new median value is preferably stored in a subsequent (n + m) -bit buffer memory 12 (for example 16 bits) shifted (see FIG. 3b). The one in this buffer 12 stored median value M. is then preferably used from there for the next median value formation retrieved. The output of the buffer memory 12 is therefore preferably directly with the other input of the comparators K2, K3 and the other input of the multiplier Ml connected. So that the median value does not fall below a certain limit, in particular in the event that the arrangement is activated shortly after it is activated, a further comparator is used K3 the specified minimum median value Mmin is compared with the current median value M. (FIG. 3b). A reset signal R is preferably used to restore the entire arrangement to put a defined initial state, in particular the buffer memory 12 to store a predetermined initial value that is chosen to be at least as large is like the minimum median value Mmin. This leads to unnecessarily long settling times prevented when calculating the median value. Preferably the comparators are K2 and K3 connected to the input of the encoder K 0 via an OR gate. To the Generation of a concurrent threshold and for the exact determination of the start of the signal and signal end is the current one available for further processing Median value M. in a further multiplication tion level M2 with a multiplied by the factor a determining the detection distance of interfering and popping signals and this value is fed to the other input E4 of the comparator K1. The factor a is obtained by weighing false alarms and detection probability, for example a = 5.

In the event that the old and the new median value are approximately the same are, the multiplication is advantageously used to increase the settling time carried out in M1 with so many decimal places that the new value is always based on the old one is different. This is fulfilled, for example, if the number of decimal places at Ml and 12 is as large as at the coding output K 0 A new one for the formation of the median value the underlying input value of the averaging unit is only obtained again at of the next r-th sample of Xi The time constant (settling time) of this (see FIG. 3) the recursive method for the formation of the median value must correspond to the temporal Behavior of the interference signal component can be adapted.

It would, of course, also be conceivable that the pop signal components to be expected by appropriate choice of the time constant by means of such a median value formation can be detected.

Precise prior knowledge of the bang signal spectrum and duration would be necessary for this.

These are advantageously the beginning and end of the signal determining detection units 8, 9 implemented in the form of binary integrators (see FIG. 4). For example, the one binary integrator BI contains one with a clock T working counter, which bit by bit the exceeding of the threshold value (output signal kK) of the received bang signal via its reset input and a corresponding one The output signal is fed to the comparator 15 (see FIG. 4). Will the specified minimum number Smin, which is present at the other input of the comparator 15, is exceeded an output signal to be interpreted as the beginning of the signal is generated by the comparator 15.

The end of a bang signal is recognized, for example, in that in a certain time interval the received signal seldom a predetermined one Exceeds threshold. Since the tail of a bang signal slowly and with fluctuating Amplitude can disappear in the background noise, must be a longer time interval can be observed than when the start of the signal is detected.

Preferably, an interval of, for example, 128 sampling periods, examined according to 250 ms. The underflow of the threshold value occurring during this time (Output signal AK) are advantageously stored in the memory 16 of a binary integrator registered, for example in an m-bit shift register with m = 128. If your If the sum falls below a certain predetermined value 5max, the signal end applies as recognized. The sum is preferably calculated with the aid of a downstream adder ADD determines whose inputs are connected to the respective m bit outputs. The output of the adder ADD is, for example, directly at an input of a downstream comparator 17, which is then one of the detection of the end of the pop signal provides the corresponding output signal when the specified at the other input of the Comparator 17 applied value Smax is below.

For bangs separated by longer pauses is preferred to choose a smaller value 5. With a high maximum signal volume, however, there is a larger one Value necessary because otherwise there may be several bangs in the recorded intervals. These contradicting demands can be reconciled by comparing Smax with increasing Increases the time since acquisition.

A signal start is preferably used as the start of that half-wave defined, which led to the detection of the start of the bang, because special Wind noise, for example caused by turbulence on the microphone, has a disruptive effect develop. A windbreak ball can reduce the noise, but not completely suppress it. Since the spectra of wind noise and useful signal overlap, that is also beneficial Adding a filter upstream is no significant improvement. The at the time of Detection of pending half-wave in particular the duration of the first half-wave therefore used to find the cause of the noise. This can be done with, for example Using a half-wave knife 18 can be carried out. So you can within a short Time to check whether it is a real useful bang signal or not. In the first In this case, the detection of the start of the signal is confirmed, in the second case it is discarded. The sampled values are therefore preferably used to detect a real bang signal Xi of the A / D converter 5 is fed to a comparator 19, which then has an output signal 1 supplies if the received sample values X. are positive and an output signal Returns 0 if the samples Xi are negative. Preferably the output of the Comparator 19 connected to the input of a subsequent counter 20, which accordingly the duration of the successive sampling values that have the same sign chens or the half-wave duration a corresponding, for example, n-bit output signal supplies. Eiz downstream two-threshold comparator 24 then supplies a real one Output signal to be interpreted, if the signal received by the counter Value (n-bit) lies within the two predetermined threshold values S1 and S2. the The specification of the two threshold values S1 and S2 depends on the expected half-wave duration the real bang signals. Advantageously, by means of a buffer 21, for example a flip-flop 21 connected downstream of the comparator 19 and a Comparator 22, one input of which is connected to the input of the flip-flop and thus also with the comparator output 19 and its other input with the Q output of the flip-flop are connected, the counter 20 by changing the sign of the received samples Xi (change in the output signal of the comparator 19 when the half-wave of the received Bang has ended), reset. Previously, the The half-period value determined is read out from the counter 20 and stored in a buffer 23 pushed. If the value is greater than S2, it is very likely wind noise or some other low-frequency interference signal. Is the value smaller than S1i it is a projectile bang or another high-frequency interference signal. The counter 20 is advantageously reset at the start of operation. Of the The intermediate memory 23 is preferably located between the comparator 24 and the counter 20.

With the help of an AND link, for example, the one detection unit delivers 8 then a given output signal when the start of the bang signal (comparator output 15), the sign change (e.g. positive half- wave terminated and the comparator output 22 supplies a predetermined output signal) detected and the duration of the half-wave corresponds to a real bang signal (two-threshold comparator 24 supplies the specified output signal). This output signal is advantageously the one detection unit 8 as a setting signal for a downstream of the time measuring unit 4 Flip-flop 25 and the output signal of the other detection unit 9 as a reset signal used for the flip-flop 25.

The output of the comparator 15 is preferably via the set input a further buffer memory P is connected to the flip-flop 25. For example the buffer memory P can then at the end of the signal by the output signal of the detection unit 9 must be reset.

From the temporal length of the output signal of the flip-flop that occurs 25 and the processing times in the pop signal arrangement, in particular those for the detection of the signal start and the signal end required time can be with a computing unit RE, for example, the exact time of the start of the pop signal and determine the end of the bang. This means that the in Samples generated by the A / D converter and continuously stored in a register RG X. possible with the associated real bang signal.

- blank page -

Claims (22)

Claims i. Procedure for recording and evaluating acoustic, pop signals falsified by interference, in particular by wind noise, thereby characterized in that the received acoustic signal is converted into a corresponding electrical Signal is implemented that the detection of the interference signal level and the noisy bang signal is carried out and that when the interference signal level is exceeded then a received signal is interpreted as a bang signal if it is exceeded of the interference signal level a predetermined period of time provided with predetermined tolerances flt occurs long. 2. The method according to claim 1, characterized in that for detection the occurring interference signal level of the middle telvalue from within a predetermined period as occurring signal amplitude values after a predetermined averaging law is formed and that this mean value with compared to the received signal composed of the interfering signal and the pop signal will. 3. Arrangement for performing the method according to claim 1 or 2, characterized in that a mechano-electrical converter (1) the received converts acoustic signal (AS) into an analog electrical signal (ES) that a downstream amplitude comparison unit (2) on the one hand via its one input (E1) directly receives the electrical signal (ES) that an averaging device (3) essentially detects the interference signal level components of the electrical signal (ES), that, on the other hand, the output of the averaging unit, which is an interference signal received provides the corresponding averaged output signal, with another input (E2) the amplitude comparison unit (2) is connected and that the amplitude comparison unit (2) supplies a predefined output signal (SV) when a predefined interference signal level is exceeded occurs around a predetermined value and that one of the amplitude comparison unit (2) downstream time measuring unit (4) the duration of a half-wave of the Kallallsigs ls determined. 4. Process in digital execution for recording and evaluation of acoustic bang signals falsified by disturbances, in particular by wind noise, characterized in that the received acoustic signal in a corresponding electrical signal is converted that a detection of the occurring Störsigna4pegels and the noisy pop signal is carried out and that at If the interference signal level is exceeded, a received signal is interpreted as a pop signal is, if the exceeding of the interference signal level a predetermined with predetermined Tolerances provided time duration occurs at long. 5. The method according to claim 4, characterized in that for detection of the occurring interference signal level the mean value of within a specified Signal amplitude values occurring over the period according to a predetermined averaging law is formed and that this mean value with that of the interference signal and the pop signal composing received signal is compared. 6. Arrangement for performing the method according to claim 4 or 5, characterized in that the acoustic received signal (AS) by the mechano-electrical Converter (1) is band-pass filtered that the mechano-electrical converter is an A / D converter (5) is connected downstream, which the received signals (ES) with a predetermined Clock frequency (fT) is sampled and the sampled values (Xi) with a specified accuracy of n bits represents that oinorsoiLs the digitized Smpfangasignal (x.) directly with one input (R3) one operated with a positive and negative threshold Two-threshold comparator (K1) is connected that an averager (6) the interference signal components of the electrical signal (ES) detected, that the output of the averaging (6), which supplies an output signal corresponding to the received interference signal, is connected to another input (E4) of the comparator (K1) and that the comparator supplies a specified output signal (AK) when a specified interference signal level is exceeded occurs. 7. Arrangement according to claim 6, characterized in that for the determination the bang signal duration a downstream time measuring unit (7) the output signal of the comparator (K1) receives and that when a bang signal is detected, the time measuring unit (7) supplies a predetermined output signal (AZ) for further processing. 8. Arrangement according to one of claims 6 to 7, characterized in that that a rectifier (G) following the A / D converter rectifies the sampled values (Xi) and that the comparator (K1) is designed in the form of a single-threshold comparator, that the rectified samples (Yi)) the one input of the single-threshold comparator (K1) and the averaging unit (6) are supplied so that the averaging unit (6) is designed in the form of a median value generator (60), the from within a vovgogoI> oiioii time interval # aul trO tolldoll median value formed from taS t values the other input of the comparator and there a time interval #o long to to determine the subsequent new median value for the comparison with the continuously received samples (Yi) is available. 9. Arrangement according to claim 8, characterized in that the time measuring unit (7) two detection units (8,9) and a gate circuit (10) that contains the output of the comparator (K1) on the one hand with a detection unit determining the start of the bang signal (8) and, on the other hand, with another detection unit which determines the end of the cold signal (9) is connected that the one detection unit (8) when receiving the output signal (AK) of the comparator (K1) a setting pulse for a downstream gate circuit (10) returns when a given number of samples (Yi) in a given Time interval the value applied to the other input (E4) of the comparator (K1) exceeds that the other detection unit (9) when recognizing the end of the bang signal a reset pulse for the gate circuit (10) and that the gate circuit (10) a predetermined output signal (AZ) within the time interval between occurring set and reset pulse for further processing. 10. Arrangement according to claim 9, characterized in that the gate circuit (10) is designed in the form of a counter that the output signal of a detection unit (8) serves as a reset signal for the downstream counter that the existing output signal the other detection catches (t)) interrupts the clock signal of the counter and that the counter at the time of the interruption until the next reset signal of the one Detection unit (8) a corresponding to the length of time of the received bang signal Supplies output signal for further processing. 11. Arrangement according to one of claims 8 to 10, characterized in that that the median value generator (6Q,) has at least two comparators (K2, K3) and an encoder d with a downstream (n + m) -bit multiplier (M1) contains that every r-th Sampling value of the sampling values "(Yi) in a sampling circuit connected upstream of the comparator (K2) (11) r clocks for one input of one comparator (K2) of the median value generator is supplied that at one input of the other comparator (K3) a predetermined one input value corresponding to the minimum median value (Mmin) that the outputs of the comparators (K2, K3) via an OR gate with the input of the encoder (Ko) are connected that the momentary vorliogerlde at the output of the multiplier (M1) Median value (Mi) in the form of (n + m) bits in a subsequent buffer memory (12) is stored that this stored value with the currently present r-th sample im a comparator (K2) and with the specified minimum median value (Mmin) im Another comparator (K3) is compared that the comparator (K2) the encoder for Output of the value 1 + g, if a given positive value is less than lr, if the r-th sample of (Y) is greater than the currently present output value of the multiplier (M1) rist that the comparator (K3) the encoder (K) to output of the 0 value 1-t if the r-th sample of less than the current one is the median value present in the buffer (12), that the multiplier (M1) the multiplication of the output value of the encoder (Ko) with the old median value, which is stored in a subsequent buffer memory (12), and that this The result is the new median value (Mi) that is stored in the buffer memory for the next clock signal (12) is inscribed, represents and for the next determination of the median value Comparators (K2, K3), the one multiplier (M1) and for the detection of bang signals the comparator (K1) is available. 12. The arrangement according to claim 11, characterized in that the comparators (K2, K3) deliver an output signal "1" if the respective input value at one Input of the comparators (K2, K3) is greater than the respective input value at the other Input and in the event that the respective input value at one input of the comparators (K2, K3) is smaller than the respective input value at the other input, a "0" provide that the entire arrangement is put into a defined initial state Reset signal resets the buffer memory (12) to a predetermined value which is at least as large as the specified minimum median value (Mmin). 13. Arrangement according to one of claims 9 to 12, characterized in that that for the 6'r'ougung oinor mitlautorldon threshold for the determination of the start of the bang signal and bang signal end the determined median value (Mi) in another subsequent Multiplication stage (M2) in the averaging unit with a detection distance of Factor (a) determining interference and pop signals is weighted. 14. Arrangement according to one of claims 9 to 13, characterized in that that the signal start and signal end determining detection units by means of binary integrators are implemented. 15. The arrangement according to claim 14, characterized in that the binary Integrator (BI) of the one detection unit (8) on the input side with a predetermined one Clock (T) working counter (14), which is followed by a comparator (15) is that the comparator (15) on the one hand the output value of the counter (14) on its receives one input and on the other hand one of the to the other input Interpreting a start of signal necessary minimum number (spin) of exceeding thresholds, receives according to a predetermined value that the counter (14) bit by bit, the threshold value is exceeded receives the bang signal via its reset input and that the comparator (15) is on predetermined output signal corresponding to the output signal of one detection unit (8) returns when the specified minimum number (spin) of exceeding the threshold value is smaller than the output value supplied by the counter that the binary integrator the detection unit determining the end of the signal; (9) an m-bit on the input side Schioborogistor (16), an adder (ADD) and a comparator (17) contains that the shift register (16) serially the output signals (AK) of a comparator (K1) receives binary that after further predetermined m-Smin stored sampling periods after detection of the beginning of the signal of the addi- rer the number of Exceeding the threshold values currently registered in the m-bit memory then continuously determines and feeds this value to one input of the following comparator (17), that the other input is supplied with a predetermined value and that the comparator (17) a predetermined corresponding to the output signal of the other detection unit (9) Output signal then delivers when the sum of the currently registered in the memory Exceeding the threshold value falls below the specified value (Smax). 16. Arrangement according to one of claims 8 to 15, characterized in that that the one detection unit (8) contains a half-wave meter (18) which consists of the number of samples (Xi) received from the A / D converter output, within the when the beginning of the signal is detected, the pending half-wave of the bang signal, the length of the half-wave measures that the one in the detection unit (8) on the output side Half-wave meter (18) provides a predetermined output signal when the length of the Half-wave lies within two specified limit values and if the den Detection unit (8) determining the beginning of the signal generates an output signal. 17. The arrangement according to claim 16, characterized in that the half-wave mosser (18) the one at the output of the analog / digital converter (5) in parallel, binary form present sample (Xi) receives that an input-side comparator (19) supplies an output signal i if the sample value is (Xi> 0) and otherwise an output signal "O" delivers, that a subsequent counter (20) the number of clocks since the last change of sign determined that by means of a buffer (21) and a further comparator (22) of the counter (20) after reading out the value is reset in a further buffer (23) by the change in sign of the received samples caused a change in the output signal of the comparator (19) that the read-out value corresponding to the half-cycle duration over the further Buffer (23) is fed to a two-threshold comparator (24) that the Two-threshold comparator (24) then supplies a predetermined output signal when the input value lies in a specified value range between (S1) and (S2) and that the one detection unit (8) then supplies a predetermined output signal, if the output signal of the comparator (15) determining the start of the pop signal, of the comparator (22) recognizing the sign change and the output signal of the Two-threshold comparator (24) have occurred. 18. Arrangement according to claim 17, characterized in that the output of the comparator (15) is connected to the set input of a further buffer memory (P) and that the buffer memory (P) at the end of the signal by the output signal of the detection unit (9) is reset. 19. Arrangement according to one of claims 15 to 18, characterized in that that the threshold (Smax) of the comparator (17) of the binary integrator of the other Detection unit (9) can be selected, depending on the time that has elapsed since the start of the signal Time. 20. The arrangement according to claim 19, characterized in that the am other input of the comparator (1 *, 7) applied threshold with increasing time Distance from the start of the signal increases according to a predetermined rule. 21. Arrangement according to one of claims 1.7 to 20, characterized in that that when the output signals of the two-threshold comparator (24), the comparator (22), which changes the sign of the received samples (Xi) via a in the form a flip-flop formed buffer (21) registered and the output signal of the buffer memory (P) are available, another flip-flop (25) in the set position is brought that the output signal of the other detection unit (9) the flip-flop (25) resets that a subsequent arithmetic unit (RE) has processed the corresponding in a register (RG) continuously stored samples (Xi) of the A / D converter (5) the pop signal (A) with the help of the output signal of the flip-flop (25) taking into account the processing time of the pop signal arrangement. 22. Arrangement according to one of claims 3 to 21, characterized in that that when leaving the muzzle or when a bullet hits the target, this happens at the same time occurring interfering signal is detected by forming the median value and for I3orochiwig oinor serving London threshold.