CN1327338A - Signal sound detection equipment and method for digital program controlled exchanger - Google Patents
Signal sound detection equipment and method for digital program controlled exchanger Download PDFInfo
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Abstract
An apparatus and method for inspecting the signal tone of the digital programmable exchange. Tone inspection unit will be fit inside the exchange or required as one part of it and shared by all the units in the exchange via exchange network. Tone inspection unit uses the digital signal processor to identify the single frquency signal tone of communication network, the the software to filter intelligently, identifying signal waveform and determining the corresponding signal tone finally. The service process of the exchange system can be used to work for special service process with recognized signal tones. This technology will be used to identify the commonly used signal tones in the communicaltion network, such as busy tone, dial tone, idel tone and jam tone, also it is of strong anti-interference and lower cost property.
Description
The present invention relates to the communication technology, the application technology of the Information Exchange System in being specifically related to communicate by letter in particular, relates to a kind of digital SPC exchange signal sound detection equipment and method.
The standard code of digital program-controlled exchange system various signal tones, as dialing tone, busy tone etc., signal tone is understood the talking state except being used for the caller, deep development and application to signal tone also increase gradually, for utilizing these signal tones, just need the signal tone that occur in the switching system be detected, for example, in the business of relevant junction call, for making switching system can detect the signal tone of other communication equipments, prior art is to increase tone detection circuit on relaying (analog junction and digital junction) interface board, there is following deficiency in this set: one, for original switching system, this structure need be changed all trunk interface plates, has increased the realization cost of system; Two, signal tone detects resource and can't share with other trunk interface plate on trunk interface plate, causes the wasting of resources to a certain degree; Three, can't in other business (as non-junction call business), provide the sound measuring ability, really weary flexibility and autgmentability.For example application number is 95109465 Chinese invention patent application, a kind of signal tone detecting method that is used for billing purpose has been proposed, its sound detects resource circuit and is implemented in interface board, can't be shared by whole system, poor expandability, and the purpose that detects of signal tone mainly is exactly in order to charge, and the scope of professional utilization is narrower.
The object of the present invention is to provide a kind of digital SPC exchange signal sound detection equipment, this equipment can detect resource for switch system inside provides a kind of public sound, by detect switch on various relayings and user interface various fixed frequency signal sound and it is applied in the different business, thereby effectively improve resource utilization, increase flexibility and extensibility, the reduction business realizing cost of amplitude peak.
The present invention also aims to provide a kind of digital SPC exchange signal tone detecting method, this method can make full use of signal sound detection equipment provided by the invention, detect the various signal tone, in fixed frequency on each relaying and user interface in the switch quickly and easily, in return the public sound of machine inside detects resource and offers different signal tone application apparatuss, and then improve resource utilization effectively, increase the flexibility and the extensibility of system applies, reduce the business realizing cost.
First purpose of the present invention is to realize like this, construct a kind of digital SPC exchange signal sound detection equipment, comprise switch master controller, interface circuit unit and sound detecting unit, when carrying out the sound detection, send instruction by the switch master controller, signal tone is routed to the sound detecting unit by the interface circuit unit through switching network, by the detection of sound detecting unit realization to signal tone, and the result reported the switch master controller, described interface circuit unit can be trunk interface circuit or user interface circuit.
In the said equipment provided by the invention, described sound detecting unit can be built in the switch part of machine in return, and its formation comprises digital signal processing appts that various frequency signals are detected and detected signal is determined that the signal waveform detection processor of its waveform is a sound detecting unit master controller.
In the said equipment provided by the invention, described sound detecting unit also comprise exchange chip, its twoport of being connected with switching network be connected to the dual port RAM between sound detecting unit master controller and the digital signal processing appts and be connected the exchange chip delivery outlet and described digital signal processing appts between string and converting unit, described sound detecting unit master controller also is connected with described exchange chip.
Another object of the present invention is to realize like this, construct a kind of digital SPC exchange signal tone detecting method, use one to be connected with switching network and can be shared by whole switching system, signal tone is concentrated monitored signal sound detecting unit, can carry out signal according to the instruction that the switch master controller sends and continue and detect, the detection method of signal tone may further comprise the steps:
Give an order to the interface circuit unit by the switch master controller;
The interface circuit unit is routed to the sound detecting unit with signal tone by switching network;
The sound detecting unit detects the tone signal that receives and testing result is sent to the switch master controller;
The tone signal that is performed such described sound detecting unit detects:
Judge the simple signal sound that has or not appointment in the input signal by digital signal processing appts; By the signal waveform detection processor simple signal Wave data is carried out filtering, judge to have or not fixing signal tone to exist.
In detection method provided by the invention, described by having or not the simple signal sound of appointment may further comprise the steps in the digital signal processing appts judgement input signal:
Input signal is successively carried out: 1) single frequency tone detects; 2) frequency characteristic detection and 3) harmonic component detects, and the input-signal judging that detects by this three step is the simple signal sound and transmits its Wave data to the signal waveform detection processor.
In according to detection method provided by the invention, described single frequency tone detects and may further comprise the steps: 1) get six representative frequency S1 (300Hz), S2 (340Hz), S3 (380Hz), S4 (420Hz), S5 (460Hz), S6 (500Hz) in 300Hz ~ 500Hz; 2) the gross power f-A of calculating input signal and 6 frequency component f (S1), f (S2), f (S3), f (S4), f (S5), f (S6); 3) if detect half that maximum frequency component f-S is not less than gross power, f-S judges then that greater than the lowest detection thresholding S-T of frequency input signal is a simple signal simultaneously.
In according to method provided by the invention, described frequency characteristic detects and may further comprise the steps: judge that maximum frequency component S1 is whether about all high 12dB of other frequency component (S3, S4) than the above frequency of being separated by on the frequency, than about all high 24dB of other frequency component (S5, S6), if an establishment is arranged, can judge that then it belongs to signal tone.
In according to method provided by the invention, described harmonic component detects and comprises that choosing frequencies of harmonic components is (R (i), i=1,2 ..., 6), calculate the big harmonic component in the positive and negative 50Hz scope of R (i), if maximum frequency component judges then that greater than 5 times of big harmonic component input signal is the simple signal sound.
In according to method provided by the invention, describedly the simple signal Wave data is carried out filtering by the signal waveform detection processor, judge that the step that has or not fixing signal tone to exist may further comprise the steps: after receiving the simple signal Wave data of sending here from digital signal processing appts by the signal waveform detection processor by dual port RAM, tone signal is carried out filtering, depict corresponding signal tone waveform, compare with known signal tone waveform again, judge to have or not corresponding fixed signal sound to exist.
In according to method provided by the invention, described signal waveform detection processor judges that having or not corresponding fixed signal sound to exist may further comprise the steps:
The order that the desampler master controller is sent, signal waveform detection processor start digital signal processing appts detection signal sound wave shape;
To the persistent signal sound, the point of determining to detect the signal tone frequency is the initial test point P of signal waveform, and to periodicity discontinuous signal sound, testing process is received the initial test point P of the disconnected moment of signal tone as signal tone;
From initial test point P, carry out timing for the sound duration of persistent signal sound, when reaching certifiable duration T, the accumulative total duration can acknowledge receipt of signal tone to the report of switch master controller; For the cyclical signal sound, beginning the sound break time is carried out timing from the P point is TL, continuous time timing is TH to sound by the continuous up trip point S point of disconnected change from signal tone, by the continuous lower trip point X point that breaks that becomes the timing of sound break time is TL1 from signal tone, equal the Signal Matching point H of two waveforms detection cycle durations in the TL1 timing, can determine the type of signal tone according to the known waveform data.
Implement digital SPC exchange signal sound detection equipment provided by the invention and method, provide a kind of public sound to detect resource in switch inside, can the various fixed frequency signal sound of centralized detecting switch on various relayings and user interface, improved resource utilization greatly, flexibility and extensibility have been increased, amplitude peak ground reduces the business realizing cost, system resource utilization is more become rationally, realizing on the automatic identification basis of signal tone to utilizing signal tone to provide support in operational application.
In conjunction with the accompanying drawings and embodiments, further specify characteristics of the present invention, in the accompanying drawing:
Fig. 1 is the system configuration structural representation of signal sound detection equipment of the present invention.
Fig. 2 has described the composition structural representation of sound detecting unit of the present invention.
The schematic diagram that Fig. 3 signal waveform detection is handled.Wherein, Fig. 3 a is the situation of state no interference signal, and Fig. 3 b is the situation that interference signal is arranged.
Fig. 4 utilizes present device and method to carry out the practical application example that busy tone detects.
Fig. 5 utilizes present device and method to carry out the practical application example that the dialing tone signal tone detects.
Fig. 6 has provided loop trunks TRK interface circuit busy tone identification and examples of applications.
The present invention is based on such thinking, the resource that signal tone detects can be shared by whole switching system, need detected signal source can be routed to the resource circuit that signal tone detects by the switching network of digital SPC exchange, as shown in Figure 1, signal handshaking procedure, signal detection process are sent to instruct by switch master controller 1 and begin.By the centralized detecting of resource circuit realization to signal tone.It is that sound detecting unit 3 is the (see figure 2)s that mainly are made of digital signal processing appts 31 and signal waveform detection processor 32 that this signal tone detects resource.Digital signal processing appts 31 operation digital signal corresponding process softwares are discerned various frequency signals, detect the fundamental frequency whether required signal tone is arranged from the signal source that contains interference signal.The corresponding signal waveform process software of signal waveform detection processor 32 operations, mainly bear the signal detecting result of sending here by receiving digital signals treatment facility 31, leach corresponding signal tone waveform by using certain software algorithm for having or not of frequency designation signal, thereby judge, give switch master controller 1 with test results report, use for Business Processing.Adopt the benefit of digital signal processing appts 31 and 32 co-ordinations of signal waveform detection processor to be: can improve the speed of signal processing, the resource apparatus that such signal tone detects can provide signal tone to detect for reaching roads up to a hundred signal source simultaneously.
In the present invention, the digital signal processing appts 31 and the signal waveform detection processor 32 of the resource that detects as signal tone are shared by whole switching system, and this is shared and is to realize under the Coordination Treatment of switch master controller 1.Switching system is realized the measuring ability of signal tone like this, only needs to increase small number of devices and gets final product, and the cost that system realizes is low.
The signal tone of indication of the present invention detects and is meant fixed signal sound in the program controlled system, the for example detection of dialing tone, busy tone, number unobtainable tone etc., this signal tone has following feature: have specific frequency and level, have specific waveform, this waveform is intermittently realizing by fixing voice frequency.In technical solution of the present invention, the detection judgement of signal tone and the business of signal tone are used and are all realized by software, and relatively independent, and system has had good stable, flexibility like this, and professional utilization can be expanded easily.
Three more concrete steps of the inventive method are described as follows:
First step: utilization digital signal processing appts 31 and corresponding software thereof, having or not of simple signal sound specified in identification.The application of single audio signal detection technique is quite universal at present; but, cause the audio signal transmission distortion because the audio signal among the present invention occurs phenomenons such as the transmission line spectral characteristic distorts, circuit is crosstalked from subscribers feeder through regular meeting; and the speech serious interference causes flase drop to be surveyed and takes place.The fundamental frequency of signal tones such as dialing tone, busy tone, howler tone is 450Hz in China Telecom's net, and must the simple signal sound in 300Hz ~ 500Hz all can reliably be judged as checkout equipment, so how when improving the simple signal sound and detecting robustness, improving its anti-speech capability is an important consideration that improves performance of the present invention.But because robustness and anti-voice are two contradictory factors, improve this two aspect simultaneously is a difficult problem.Though the books and periodicals of many Digital Signal Processing aspect provide various single frequency tone detection algorithms, its design is a background with certain application-specific often, can not adapt to the telecommunications network characteristics of China.Purpose of the present invention is exactly the above-mentioned defective that overcomes existing single frequency tone detection technique, on the general dsp chip, provide a kind of with low cost, take into account robustness and anti-speech capability, be subjected to the little single frequency tone detection method of factor affecting such as environment.For realizing above-mentioned target, the present invention proposes with multiple single frequency tone detection is the method for core, it detects step by three and constitutes: single frequency tone detects, frequency characteristic detects, harmonic component detects, and has only the input signal that detects by this three step just to think the simple signal sound.
Wherein, single frequency tone detects and is used to judge whether input signal mainly is made of 300Hz ~ 500Hz sound.Get representative frequency S1 (300Hz), S2 (340Hz), S3 (380Hz), S4 (420Hz), S5 (460Hz), S6 (500Hz) in 300Hz ~ 500Hz.Below input signal is the linear code signal that 8KHz samples in the narration.Simultaneously, for sake of convenience, represent gross power with f-A; Represent 128 the DFT mould quadrantal components of input signal respectively with f (S1), f (S2), f (S3), f (S4), f (S5), f (S6), be referred to as 6 frequency components at 6 frequency S1, S2, S3, S4, S5, S6 place; Represent the frequency of maximum frequency component correspondence with S-N, and represent maximum frequency component with F-S.
Described single frequency tone detects and comprises that gross power f-A calculates, 6 frequency component f (S1), f (S2), f (S3), f (S4), f (S5), f (S6) calculate, and the detection of being undertaken by following criterion is judged, if promptly input signal is a simple signal, should satisfy so: maximum frequency component f-S should be not less than half of gross power; F-S should all leave big leeway greater than the lowest detection thresholding of frequency in the design, to adapt to the frequency spectrum distortion and the bigger crosstalk noise of circuit, this is why the present invention can improve one of the key factor of system robustness or detectability that collects the digits.
Described frequency characteristic detects and harmonic component detects to be used to check whether input signal has the spectral characteristic that is different from speech signal that the single frequency tone signal is held, and this is outstanding feature of the present invention, is the effective measures of the anti-speech capability of raising detection system.
Described frequency characteristic detects and refers to judge that maximum frequency component is whether than the big certain multiple of other frequency component of the above frequency of being separated by on the frequency, such as S1 is maximum frequency component, should judge that whether the S1 component is than about S3, all high 12dB of S4 component, than about S5, all high 24dB of S6 component.This is the characteristic that the simple signal sound is different from voice signal, and simultaneously, parameter chooses the noise jamming that has also taken into full account circuit herein.
Described harmonic component detects the calculating of the frequency selection purposes and the harmonic component that comprise harmonic component.Harmonic component comprises 6 frequencies, it is the triple-frequency harmonics of the second harmonic of S1, S3, S5 and S2, S4, S6, with R (i), i=1,2 ..., 6 represent this 6 harmonic wave frequencies respectively, with f_R (i), i=1,2 ..., 6 represent that respectively input signal at the mould of 128 DFT at 6 harmonic wave frequency places square, represents total harmonic component with f-R-A.Calculating to 6 harmonic components compensates, and has expanded the frequency coverage of harmonic component, and effectively reducing the voice signal flase drop is the possibility of single frequency tone signal.Because such situation is arranged in the real system: the first-harmonic of voice signal is just in the single frequency tone scope, but its more high order harmonic component might not be R (i), i=1,2 ..., 6, may differ tens hertz therewith, the frequency component that R (i) is located is very low, if do not compensate, it is not judged as voice signal probably, make the simple signal sound and be mistakened as, flase drop takes place survey.Be head it off, the present invention chooses R (i)-50Hz and R (i)+50Hz as aforementioned R (i) harmonic compensation point.Like this, when the high order harmonic component of voice signal appears at when differing on tens hertz the frequency with R (i), even the frequency component of locating at R (i) is very little, can higher component appear at R (i) ± 50Hz place also, by compensation, harmonic component detects will find that this is a voice signal, but not the simple signal sound, thereby the anti-speech capability of raising detection system.Harmonic component detects and to require maximum frequency component about 5 times greater than harmonic component, then detect by harmonic component, otherwise harmonic component detects and do not pass through, and input signal is not the simple signal sound.
Described simple signal sound multiple detection method can realize on the general dsp chip easily, if with the dsp chip of company of Texas Instruments (TI), a slice just can realize that 60 road simple signal sounds detect so, and cost is very low.
Second step: signal waveform detection processor 32 is accepted the Wave data of the simple signal that digital signal processing appts 31 sends here by dual port RAM 34, the utilization software algorithm is carried out filtering to tone signal, depict corresponding signal tone waveform, compare with known signal tone waveform again, judge to have or not corresponding fixed signal sound to exist.This purpose utilizes software state machine to realize.Concrete steps are as follows:
1, desampler master controller 1 order of sending, signal waveform detection processor 32 starts digital signal processing appts 31 detection signal sound wave shapes, the order that switch master controller 1 is sent has two types: a kind of is to detect persistent signal sound such as dialing tone, and another kind is sense cycle signal tone such as busy tone, number unobtainable tone etc.
2, seek the initial test point P of signal waveform detection, so-called initial test point P is that signal waveform detection software uses specific algorithm computation signal waveform from this point, why to determine the initial test point P of signal, be because when detecting the frequency of signal tone, for the persistent signal sound, get final product signal calculated sound persistence length this moment, and for periodicity discontinuous signal sound, because not necessarily just in time be the beginning of one-period of the signal tone of detected signal source this moment, at this moment can't go up and measure the signal tone waveform from the time.Determine that the initial test point P of signal waveform is an Important Thought of signal waveform process software.For the persistent signal sound, the point that detects the signal tone frequency promptly can be its initial signal test point P; For the cyclical signal sound, the moment that detects the frequency of signal tone not necessarily just in time is the beginning of one-period of the signal tone of detected signal source, so the disconnected process of comfort tone.
3, periodically the discontinuous signal sound detects processing procedure, detects the disconnected of signal tone, with signal tone intermittently as a signal period, just in time be the beginning of one-period this moment, so will this moment as the initial test point P of signal tone.
4, from initial test point P, for the persistent signal sound, the sound duration is carried out timing, when reaching certifiable duration T, the accumulative total duration can acknowledge receipt of signal tone to 1 report of switch master controller.For the cyclical signal sound, beginning the sound break time is carried out timing from the P point is TL, signal tone is called up trip point S by the continuous point of disconnected change, from the S point the continuous time of sound being carried out timing is TH, signal tone is called lower trip point X by the continuous breakpoint that becomes, from the X point sound break time being carried out timing is TL1, when equaling the point of two waveforms detection during the cycle, the TL1 timing is called Signal Matching point H, so-called Signal Matching point is meant the Wave data that can confirm to obtain the one-period signal period at this point, TL1 is equaled the H point of two waveforms detection cycle durations as the Signal Matching point, based on 2 considerations: the one,, the TL1 time can not be oversize, at the Signal Matching point, owing to obtained one-period signal waveform situation, so can determine the type of signal tone by given data.If the time is oversize, then influence detected speed signal.The 2nd,, TL1 can not be too short, in theory, entered second signal detection cycle from lower trip point X commencing signal waveforms detection, the X point promptly can be used as the Signal Matching point, but consider that the signal in the actual environment disturbs, from the beginning of X point might be a break signal that disturbs, but the time and intensity that general interference signal continues is limited, with the TL1 timing equal two waveforms detection cycles generally can confirm this moment really signal tone entered disconnected process, some interference signals have so just been filtered effectively, to guarantee detection accurately to signal waveform.For different signal tones, behind the signal tone that detects one or more cycles, just can reach a conclusion and report.Fig. 3 (a) is a schematic diagram of waveforms detection, on schematic diagram, has marked above-mentioned said each point detection signal, and this schematic diagram is that 10ms describes according to signal waveform detection processor signal sense cycle.The affirmation process that the H that also having described in Fig. 3 (b) has interference signal is ordered.
The 3rd step: the business utilization of signal tone testing result.This utilization process comprises following two aspects: the firstth, and the business utilization of the detection of call failure sound, busy tone:
1, carries out the relaying (can be digital junction, analog junction and various signaling side worker) that busy tone detects for needs, in the trunk group attribute, be provided with and carry out the busy tone detection.
2, primary control program is sought an idle tone detecting unit 3 by the Foreground Data storehouse, an idle time slot that links to each other with switching network 4 with sound detecting unit 3.
3, primary control program sends out message for signal waveform detection processor 32 devices of sound detecting unit 3, and the corresponding sound detecting unit 3 of initialization is prepared recognition failures sound (busy tone, number unobtainable tone, Congestion Tone etc.), and sound detecting unit 3 is linked to each other with switching network 4.
4, after calling enters into talking state, the time slot multiple connection is carried out in calling or outgoing on switching network 4, unidirectional speech channel is received on the signal tone detecting unit 3 beginning recognition failures sound.
5, notification call treatment progress when signal tone detecting unit 3 detects the failure sound, call treatment process record is according to failure sound type failure cause and call release.
6, when calling out release, remove the unidirectional road that is relayed to sound detecting unit 3, the sound detecting unit 3 of release busy and switching network time slot.
Second is to the detection of dialing tone and the realization of a time-delay number function, the out-trunk dialing tone detects time-delay and sends out number, at private network, subscriber computer, comprise and sending out number after often requiring on the relaying signaling of various manual toll switchboards to send dialing tone and detect signal tone, what adopt on call flow in the past is the method that time-delay is sent out number, and this method is to begin to send out number following two problems of existence after several seconds in time-delay behind the outbound call off-hook.When the other side office send dialing tone soon, time-delay send out number may cause send out number too slow; When if the other side office just send dialing tone slow, can cause and lose phenomenon the first number.The employing dialing tone detects, and can in time send out number according to the speed of dialing tone, continues fast thereby guarantee to call out.If repeated detection is then alarmed less than dialing tone, notify the attendant to check circuit, guarantee percept of call completed, its concrete steps are as follows:
1, detect the relaying (as loop trunks) of dialing tone for needs, the code sending method in the trunk group attribute changes dialing tone into and detects.
2, when out-trunk send take after, primary control program is sought the sound detecting unit 3 of a free time by the Foreground Data storehouse, and an idle time slot linking to each other with switching network 4 of sound detecting unit 3.
3, primary control program is given 32 message of signal waveform detection processor of sound detecting unit 3, and the corresponding sound detecting unit 3 of initialization is prepared the identification dialing tone, and sound detecting unit 3 is linked to each other with switching network 4.
4, when sound detecting unit 3 detects dialing tone, send out message informing to primary control program, primary control program begins to send out number, removes the unidirectional road that is relayed to sound detecting unit 3, the sound detecting unit 3 of release busy and switching network time slot simultaneously.
5, if this receives failure sound or the overtime dialing tone of confiscating, then call release.
6, if a relaying repeatedly can not receive dialing tone, then to the maintenance console alarm, and inaccessible this relaying.
Fig. 4 and Fig. 5 illustrate the practical application example that utilizes present device and method to carry out busy tone and dialing tone detection respectively.Wherein, busy tone detects and by switching network 4 tone signal is delivered to sound detecting unit 3 by TU Trunk Unit 5, carrying out signal tone (busy tone) detects, meanwhile, communication session is routed to subscriber unit 2 from TU Trunk Unit 5 by switching network 4, is detecting in the speech channel that continues from TU Trunk Unit 5 whether busy-back signal is arranged all the time at communication process middle pitch detecting unit 3.。Dialing tone detects and by switching network 4 tone signal is delivered to sound detecting unit 3 by TU Trunk Unit 5, when sound detecting unit 3 detects from dialing tone that TU Trunk Unit 5 is come, switch master controller 1 control is routed to TU Trunk Unit 5 with DTMF/MF transmitting-receiving unit 2 by switching network 4, by DTMF/MF transmitting-receiving unit 2 by the repeat circuit on the TU Trunk Unit 5 to another exchange number of sending out.
Fig. 6 has provided loop trunks TRK interface circuit busy tone identification and examples of applications.It comprises following process:
Step 6, stop tone detects, and discharges the shared resource of user A, discharges the loop trunks resource.
Claims (10)
1, a kind of digital SPC exchange signal sound detection equipment, it is characterized in that, comprise switch master controller (1), interface circuit unit (2) and sound detecting unit (3), when carrying out the sound detection, send instruction by switch master controller (1), signal tone is routed to sound detecting unit (3) by interface circuit unit (2) through switching network (4), by the detection of sound detecting unit (3) realization to signal tone, and the result reported switch master controller (1), described interface circuit unit (2) can be trunk interface circuit or user interface circuit.
2, according to the described equipment of claim 1, it is characterized in that, described sound detecting unit (3) can be built in the switch and the part of machine in return, and its formation comprises digital signal processing appts (31) that various frequency signals are detected and detected signal is determined that the signal waveform detection processor of its waveform is a sound detecting unit master controller (32).
3, according to the described equipment of claim 1, it is characterized in that, described sound detecting unit (3) also comprise exchange chip (33), its twoport of being connected with switching network (4) be connected to the dual port RAM (34) between sound detecting unit master controller (32) and the digital signal processing appts (31) and be connected exchange chip (33) delivery outlet and described digital signal processing appts (31) between string and converting unit (35), described sound detecting unit master controller (32) also is connected with described exchange chip (33).
4, a kind of digital SPC exchange signal tone detecting method, use one to be connected with switching network (4) and can be shared by whole switching system, signal tone is concentrated monitored signal sound detecting unit (3), can carry out signal according to the instruction that switch master controller (1) sends continues and detects, it is characterized in that the detection method of signal tone may further comprise the steps:
Give an order to interface circuit unit (2) by switch master controller (1);
Interface circuit unit (2) is routed to sound detecting unit (3) with signal tone by switching network (4);
Sound detecting unit (3) detects the tone signal that receives and testing result is sent to switch master controller (1);
The tone signal that is performed such described sound detecting unit (3) detects:
Judge the simple signal sound that has or not appointment in the input signal by digital signal processing appts (31);
By signal waveform detection processor (32) the simple signal Wave data is carried out filtering, judge to have or not fixing signal tone to exist.
5, according to the described method of claim 4, it is characterized in that, described by having or not the simple signal sound of appointment may further comprise the steps in digital signal processing appts (31) the judgement input signal:
Input signal is successively carried out: 1) single frequency tone detects; 2) frequency characteristic detection and 3) harmonic component detects, and the input-signal judging that detects by this three step is the simple signal sound and transmits its Wave data to signal waveform detection processor (32).
6, according to the described method of claim 5, it is characterized in that described single frequency tone detects and may further comprise the steps: 1) get six representative frequency S1 (300Hz), S2 (340Hz), S3 (380Hz), S4 (420Hz), S5 (460Hz), S6 (500Hz) in 300Hz ~ 500Hz; 2) the gross power f-A of calculating input signal and 6 frequency component f (S1), f (S2), f (S3), f (S4), f (S5), f (S6); 3) if detect half that maximum frequency component f-S is not less than gross power, f-S judges then that greater than the lowest detection thresholding S-T of frequency input signal is a simple signal simultaneously.
7, according to the described method of claim 5, it is characterized in that, described frequency characteristic detects and may further comprise the steps: judge that maximum frequency component S1 is whether about all high 12dB of other frequency component (S3, S4) than the above frequency of being separated by on the frequency, than about all high 24dB of other frequency component (S5, S6), if an establishment is arranged, can judge that then it belongs to signal tone.
8, according to the described method of claim 5, it is characterized in that, described harmonic component detects and comprises that choosing frequencies of harmonic components is (R (i), i=1,2 ..., 6), calculate the big harmonic component in the positive and negative 50Hz scope of R (i), if maximum frequency component judges then that greater than 5 times of big harmonic component input signal is the simple signal sound.
9, according to the described method of any one claim among the claim 4-8, it is characterized in that, describedly the simple signal Wave data is carried out filtering by signal waveform detection processor (32), judge that having or not fixing signal tone to exist may further comprise the steps: after receiving the simple signal Wave data of sending here from digital signal processing appts (31) by signal waveform detection processor (32) by dual port RAM (34), tone signal is carried out filtering, depict corresponding signal tone waveform, compare with known signal tone waveform again, judge to have or not corresponding fixed signal sound to exist.
According to the described method of claim 9, it is characterized in that 10, described signal waveform detection processor (32) judges that having or not corresponding fixed signal sound to exist may further comprise the steps:
The order that desampler master controller (1) is sent, signal waveform detection processor (32) start digital signal processing appts (31) detection signal sound wave shape;
To the persistent signal sound, the point of determining to detect the signal tone frequency is the initial test point P of signal waveform, and to periodicity discontinuous signal sound, testing process is received the initial test point P of the disconnected moment of signal tone as signal tone;
From initial test point P, carry out timing for the sound duration of persistent signal sound, when reaching certifiable duration T, the accumulative total duration can acknowledge receipt of signal tone to switch master controller (1) report; For the cyclical signal sound, beginning the sound break time is carried out timing from the P point is TL, continuous time timing is TH to sound by the continuous up trip point S point of disconnected change from signal tone, by the continuous lower trip point X point that breaks that becomes the timing of sound break time is TL1 from signal tone, equal the Signal Matching point H of two waveforms detection cycle durations in the TL1 timing, can determine the type of signal tone according to the known waveform data.
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| CNB001171291A CN1159895C (en) | 2000-06-01 | 2000-06-01 | Signal Sound detection equipment and method for digital program controlled exchanger |
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| CNB001171291A CN1159895C (en) | 2000-06-01 | 2000-06-01 | Signal Sound detection equipment and method for digital program controlled exchanger |
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|---|---|---|---|
| CNB001171291A Expired - Fee Related CN1159895C (en) | 2000-06-01 | 2000-06-01 | Signal Sound detection equipment and method for digital program controlled exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1159895C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272420B (en) * | 2007-03-22 | 2011-08-24 | 中兴通讯股份有限公司 | Busy tone detecting method and apparatus |
| CN102185980A (en) * | 2011-01-30 | 2011-09-14 | 广东佳和通信技术有限公司 | A method for detecting relay busy tone of a switch loop |
-
2000
- 2000-06-01 CN CNB001171291A patent/CN1159895C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272420B (en) * | 2007-03-22 | 2011-08-24 | 中兴通讯股份有限公司 | Busy tone detecting method and apparatus |
| CN102185980A (en) * | 2011-01-30 | 2011-09-14 | 广东佳和通信技术有限公司 | A method for detecting relay busy tone of a switch loop |
| CN102185980B (en) * | 2011-01-30 | 2013-10-09 | 广东佳和通信技术有限公司 | A method for detecting relay busy tone of a switch loop |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1159895C (en) | 2004-07-28 |
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