CN1798198A

CN1798198A - Signal detection device and method, and number detection device and method

Info

Publication number: CN1798198A
Application number: CN 200410101529
Authority: CN
Inventors: 李明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-12-21
Filing date: 2004-12-21
Publication date: 2006-07-05
Anticipated expiration: 2024-12-21
Also published as: CN100499695C

Abstract

The invention consists of: a signal receiver used to receive the signal to be tested; an overlapping buffer unit connected to the signal receiver and used to capture the first signal to be tested whose detection window length is A, in the next, separately buffer end signals to be tested whose previous detection window length is B, which combines a signal to be tested whose length is S=A-B to build a next detection window signal to be tested; a signal detection unit connected with the overlapping buffer unit and used to detect the detection window signal to be tested built by the overlapping buffer unit. The invention also discloses a method thereof.

Description

Signal supervisory instrument and method thereof and number checkout gear and method thereof

Technical field

The present invention relates to the signal detection technique of the communications field, relate in particular to a kind of signal supervisory instrument and method thereof and number checkout gear and method thereof.

Background technology

Dual-tone multifrequency (DTMF, Dual Tone Multi-Frequency) signal detection technique is to use very general a kind of signal detection technique in the communication network at present, be mainly used in dialing when making a phone call (as button) in the communication process and two-stage dialing (as after dialing 200 Service Phones, system uses voice suggestion to allow you by selecting corresponding service by corresponding button, and button operation is two-stage dialing once more).Existing general dtmf signal detection technique can both reach the GB requirement (dtmf signal detects GB and sees the following form 1) that dtmf signal detects, by table 1 as seen, because the frequency range of dtmf signal is that (frequency of people's language is 20～20KHz) in the frequency range of people's voice, therefore, if the dtmf signal checkout equipment accuracy of detection of network side not enough (satisfying under the situation of GB), with regard to the detection that is easy to occur people's voice mistake is dtmf signal, promptly causes so-called phonetic dialing easily.

Table 1:DTMF input international indicator

Project	Phone	The DTMF digit receiver
Project	Phone	The DTMF digit receiver	Nominal frequency		1209,1336,1477,1633Hz low frequency group: 697,770,852,941 Hz high frequency groups:
Frequency deviation	Be no more than ± 1.5%	± 2.0% does not receive ± does not guarantee between 2.0%～± 3.0% with the above assurance of interior reliable reception ± 3.0% and receives	Nominal frequency
Frequency deviation	Be no more than ± 1.5%		Level	Low frequency group :-9 ± 3dBm high frequency group :-7 ± 3dBm high-frequency level is not less than low-frequency level; Level difference is not more than 2 ± 1dB	During two-frequency operation, single-frequency incoming level scope :-4～-during the 23dBm two-frequency operation, the single-frequency level of being failure to actuate :-31dBm double frequency level difference: ± 6dB

The pickup electrode limit	＞40ms/ position	The 40ms/ position
The pickup electrode limit	＞40ms/ position	The 40ms/ position	The sigtnal interval duration	＞40ms	The 40ms/ position
The percent of call lost		4/10000ths	The sigtnal interval duration	＞40ms	The 40ms/ position

Annotate: go up table 1 international indicator and select from " Ministry of Posts and Telecommunications's technical stipulation--the total technical specification book of-Ministry of Posts and Telecommunications telephony switching gear ".

Wherein, " double-tone " means each dtmf signal and all is made up of two frequencies in the touch-tone signal (dtmf signal), and " multifrequency " means dtmf signal can multiple frequency; The DTMF frequency can be divided into following two groups:

Low frequency group: 697Hz, 770Hz, 852Hz, 941Hz

High frequency group: 1209Hz, 1336Hz, 1477Hz, 1633Hz

A DTMF number of wherein being dialed in the communication process promptly is made up of a low frequency in the above-mentioned low frequency group and a high frequency in the high frequency group, just can obtain DTMF directory commonly used at present as shown in Figure 1 thus, a left side three row parts are common being seen telephone terminal keyboard now among the figure, and the right side one row generally need not at present.

Dtmf signal can be used to transmit signaling on voice traffic channel at present, for example: use 200 phonecards, when dialing " 200 " for the first time, can learn from DTMF directory shown in Figure 1 that then in fact telephone terminal has sent following three class frequencys combination to the network side switch: " 697+1336 ", " 941+1336 " and " 941+1336 "; After the network side switch detects this three class frequencys combination by the dtmf signal checkout equipment, can obtain the number that user side dials and be " 200 ", this moment then can point out the user once more button select mandarin service or English service etc., afterwards the user once more button select, until connect phone; In this communication process, the transmit leg of dtmf signal is a telephone terminal, and the recipient of dtmf signal is the dtmf signal checkout equipment that is placed on network side switch inside.Because in communication process, the user also may speak in button, or other noise existence etc. are arranged on every side, these sound all might enter telephone terminal, send to the dtmf signal checkout equipment together with dtmf signal subsequently; If at this moment the dtmf signal checkout equipment accuracy of detection of network side is not high, the detection that then may occur speech or other noise error is the situation of DTMF number, so that number detection mistake occurs.

The just often utilization on fixed telephone terminal of above-mentioned situation, and when fixed telephone terminal dials, the user can not talk generally speaking simultaneously, or ambient noise is not very strong, therefore speech together sends to the dtmf signal checkout equipment in company with dtmf signal, and the problem that is caused is generally little.But in some intelligent sound business, can require the user usually when transmitting voice at present, can transmit dtmf signal, so the accuracy of detection of the dtmf signal checkout equipment of network side just seems most important at this moment; If the accuracy of detection that improves the dtmf signal checkout equipment of network side simultaneously also can improve the scope of application of dtmf signal checkout equipment greatly.

See also Fig. 2, this figure is the concrete composition structure and the input principle schematic thereof of existing dtmf signal checkout equipment; Wherein the operation principle of dtmf signal checkout equipment is the characteristics of being made up of two frequencies at a DTMF numerical signal, at first pass through band pass filter 1 and high pass filter 2 with the low frequency group (697Hz in the dtmf signal, 770Hz, 852Hz, 941Hz) and high frequency group (1209Hz, 1336Hz, 1477Hz, 1633Hz) separately, and then detect in low frequency group and the high frequency group whether have the DTMF frequency by low frequency group energy detection unit 3 and high frequency group energy detection unit 4 respectively, if exist, then export DTMF low frequency and DTMF high frequency respectively to the number of declaring unit 5, carry out number by the number of declaring unit 5 according to these two height frequencies at last and judge, obtain final DTMF number.

Detect the international indicator and can see from the dtmf signal shown in the last table 1, the shortest lasting duration of dtmf signal is 40ms, and the speech sample frequency in fixed telephone network or the mobile telephone network generally all is 8KHz at present, and 320 sampled points are in fact just arranged in the dtmf signal of 40ms like this.Can see from dtmf signal checkout equipment shown in Figure 2, the dtmf signal checkout equipment is in the process that dtmf signal is detected, low frequency group energy detection unit 3 is detected having relatively high expectations of low frequency part and high frequency group energy detection unit 4 detection HFSs, therefore low frequency group energy detection unit 3 and high frequency group energy detection unit 4 these two parts generally all adopt discrete Fourier transform (DFT) (DFT, Discrete FourierTransform) respectively low-and high-frequency partly to be detected.The DFT detection mode is to adopt a detection window to intercept dtmf signal, the energy that respectively sampled point in the window is carried out in the high frequency group 4 low frequencies in 4 high frequencies or the low frequency group calculates then, calculate a higher low frequency of energy in higher high frequency of energy in the high frequency group or the low frequency group respectively, if the energy of this high frequency that calculates or low frequency has reached predefined energy threshold, then high frequency group energy detection unit 4 or low frequency group energy detection unit 3 are just thought contain this DTMF high frequency or DTMF low frequency in this detection window, and export detected this high frequency or low frequency respectively.

As mentioned above, because the shortest lasting duration of dtmf signal is 40ms, like this in the DFT testing process, for guaranteeing that having the total data in the one-time detection window at least all is dtmf signal, then each detection window maximum can only arrive 20ms surely, so just can guarantee that having the total data in the one-time detection window at least all is dtmf signal (generally speaking), having twice total data in the detection window under the best-case all is dtmf signal (under the best-case), specifically see also Fig. 3, this figure is that existing dtmf signal checkout equipment uses the 20ms detection window dtmf signal to be intercepted the schematic diagram of processing, as shown in the figure, detection window according to 20ms pre-determines energy threshold, in the dtmf signal testing process, surpassed the energy threshold of setting as long as detect the energy value that the DTMF frequency is arranged in the detection window, just explanation has detected this DTMF frequency.

Because being the detection window according to 20ms, the energy threshold value sets in advance, detection window is big more, required energy threshold value is high more, therefore as shown in Figure 3, if the data transformation in the 20ms detection window is a dtmf signal, then be difficult to detect the DTMF frequency and can surpass the energy threshold value that sets in advance, promptly be difficult to detect the DTMF frequency.Existing like this use 20ms detection window intercepts dtmf signal, always there is the dtmf signal of 20ms to be wasted, generally having only total data all is that the detection window of dtmf signal just can detect corresponding D TMF frequency and (all has this problem among Fig. 3 generally speaking, and do not have this problem under the best-case, but the probability that best-case occurs is low-down).And generally speaking, the general time that occurs of situation of containing the DTMF frequency in people's voice is also all shorter, that is to say, if comprised the DTMF frequency of 20ms in people's voice, then in the dtmf signal checkout equipment, just be easy to and be detected, form phonetic dialing.In this case, just need to improve the accuracy of detection of existing dtmf signal checkout equipment, to resist the phonetic dialing mistake that the user forms in dialing procedure.

Summary of the invention

First technical problem that the present invention will solve is to propose a kind of signal supervisory instrument and method thereof that can improve the input precision.

Second technical problem that the present invention will solve is a kind ofly can improve the input precision, forms the number checkout gear and the method thereof of phonetic dialing mistake in dialing procedure with the opposing user.

For solving above-mentioned first problem, the present invention proposes a kind of signal supervisory instrument, comprising:

Signal receiving unit is used to receive measured signal;

Overlapping buffer cell, be connected with described signal receiving unit, be used for after catching the first detection window measured signal that length is A, on the follow-up buffer memory respectively in the detection window length be the afterbody measured signal of B, with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

Detecting signal unit is connected with described overlapping buffer cell, and each the detection window measured signal that is used for respectively overlapping buffer cell being constructed detects.

Described overlapping buffer cell specifically comprises:

Detection window is caught subelement, is connected with described signal receiving unit, is used to catch the detection window measured signal that each length is A;

The buffer memory subelement is used for that a detection window length is the afterbody measured signal of B on the buffer memory;

Detection window constructor unit, catch subelement with described detection window respectively, the buffer memory subelement is connected with detecting signal unit, it is the head measured signal of S=A-B that afterbody measured signal that a last detection window length that is used for extracting respectively buffer memory subelement buffer memory is B and detection window are caught the detection window measured signal length that subelement catches, to construct next detection window measured signal;

Signal intercepting subelement is connected with the buffer memory subelement with described detection window constructor unit respectively, and each the detection window intercepted length that is used for detection window constructor unit structure is gone out is the afterbody measured signal of B, and sends into buffer memory subelement buffer memory.

Described detection window is caught in the subelement and is also comprised:

Judging unit is used for behind the detection window measured signal that to catch a length be A, after described detection window constructor unit extracts length and is the measured signal of S=A-B, judges the magnitude relationship of residue measured signal length and S=A-B at every turn;

Trigger element is connected with described judging unit, is used for when judgment unit judges goes out to remain measured signal length less than S=A-B, triggers described detection window and catches subelement and catch the detection window measured signal that next length is A.

Correspondingly, the invention allows for a kind of signal detecting method, comprise step:

Receive measured signal;

After in the signal that receives, catching the first detection window measured signal that length is A, on the follow-up buffer memory respectively in the detection window length be the afterbody measured signal of B, with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

Respectively each the detection window measured signal that constructs in the step (2) is detected.

Described step (2) specifically comprises step:

(21) buffer memory one length is the spacing wave of B in advance;

(22) catch the detection window measured signal that length is A;

(23) length of extracting buffer memory respectively is that length is the head measured signal of S=A-B in the spacing wave of B and the detection window measured signal of catching, to construct first detection window measured signal;

(24) intercepting first detection window length of being constructed is B the afterbody measured signal carries out buffer memory;

(25) length of extracting buffer memory respectively is that length is the head measured signal of S=A-B in the afterbody measured signal of B and the detection window measured signal of catching, to construct next detection window measured signal;

(26) intercepting this next detection window length of being constructed is B the afterbody measured signal carries out returning execution in step (25) behind the buffer memory.

Before the detection window measured signal that extraction is caught, also comprise step in the described step (25): whether judge the residue measured signal length of catching more than or equal to S=A-B, if carry out the processing of extracting the detection window measured signal of catching; Otherwise carry out the processing of extracting the detection window measured signal of catching again after catching next length and be the detection window measured signal of A.

For solving above-mentioned second problem, the present invention proposes a kind of number checkout gear, be used for the number information that detection signal carries, comprising:

Signal receiving unit is used to receive measured signal;

Filter unit is connected with described signal receiving unit, is used for filtering out to received signal the frequency range group's measured signal that is in different frequency range;

Overlapping buffer cell, be connected with described filter unit, after being used for respectively different frequency range group measured signal being caught the first detection window measured signal that length is A, on the follow-up buffer memory respectively in the detection window length be the afterbody measured signal of B, with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

The signal energy detecting unit, be connected with described overlapping buffer cell, be used for respectively overlapping buffer cell being carried out energy measuring at each detection window measured signal that the different frequency range group constructs, to detect the highest frequency signal of energy in each detection window measured signal;

The number of declaring unit, be connected with described signal energy detecting unit, be used for determining corresponding number information according to the signal energy detecting unit at the detected frequency signal of different frequency range group detection window measured signal simultaneously, and when the number information unanimity that priority at least twice is determined, export this unanimity number information, continue the detection of next number information then and handle.

Described measured signal is a touch-tone signal; Described touch-tone signal comprises high frequency group and two frequency range groups of low frequency group.

Described filter unit specifically comprises:

Band pass filter is connected with described signal receiving unit, is used for filtering out the low frequency group measured signal of received signal;

High pass filter is connected with described signal receiving unit, is used for filtering out the high frequency group measured signal of received signal.

Described overlapping buffer cell specifically comprises:

The first overlapping buffer sublayer unit, be connected with described band pass filter, be used for after catching the first detection window low frequency group measured signal that length is A, on the follow-up buffer memory respectively in the detection window length be the afterbody measured signal of B, with follow-up length be that the low frequency group measured signal of S=A-B constitutes next detection window low frequency group measured signal;

The second overlapping buffer sublayer unit, be connected with described high pass filter, be used for after catching the first detection window high frequency group measured signal that length is A, on the follow-up buffer memory respectively in the detection window length be the afterbody measured signal of B, with follow-up length be that the high frequency group measured signal of S=A-B constitutes next detection window high frequency group measured signal.

Described signal energy detecting unit specifically comprises:

Low frequency group energy measuring subelement is connected with the described first overlapping buffer sublayer unit, is used for detecting respectively the highest low frequency signal of sending the first overlapping buffer sublayer unit of each detection window low frequency group measured signal energy;

High frequency group energy measuring subelement is connected with the described second overlapping buffer sublayer unit, is used for detecting respectively the highest high-frequency signal of sending the second overlapping buffer sublayer unit of each detection window high frequency group measured signal energy.

Described low frequency group energy measuring subelement specifically comprises:

The first threshold value storing sub-units is used for according to described detection window measured signal length A setting and stores one first judgement threshold value;

Low frequency group energy computation subunit, be connected with the described first overlapping buffer sublayer unit, be used for calculating the energy value of each each low frequency of detection window low frequency group measured signal of sending the first overlapping buffer sublayer unit and the total energy value of each detection window low frequency group measured signal; And the ratio between the total energy value of the energy value that calculates the highest low frequency signal of each detection window self-energy and corresponding detection window low frequency group measured signal;

First compares subelement, be connected with low frequency group energy computation subunit with the described first threshold value storing sub-units respectively, be used for ratio that low frequency group energy computation subunit is calculated at each detection window low frequency group measured signal and the first judgement threshold value of first threshold value storing sub-units storage and compare;

Low frequency signal output subelement, be connected with the number of declaring unit with the described first comparison subelement respectively, be used for according to first comparative result of subelement relatively, when described ratio was higher than the described first judgement threshold value, output was given the number of declaring unit to low frequency signal that should ratio.

Described high frequency group energy measuring subelement specifically comprises:

The second threshold value storing sub-units is used for according to described detection window measured signal length A setting and stores one second judgement threshold value;

High frequency group energy computation subunit, be connected with the described second overlapping buffer sublayer unit, be used for calculating the energy value of each each high frequency of detection window high frequency group measured signal of sending the second overlapping buffer sublayer unit and the total energy value of each detection window high frequency group measured signal; And the ratio between the total energy value of the energy value that calculates the highest high-frequency signal of each detection window self-energy and corresponding detection window high frequency group measured signal;

Second compares subelement, be connected with high frequency group energy computation subunit with the described second threshold value storing sub-units respectively, be used for ratio that high frequency group energy computation subunit is calculated at each detection window high frequency group measured signal and the second judgement threshold value of second threshold value storing sub-units storage and compare;

High-frequency signal output subelement, be connected with the number of declaring unit with the described second comparison subelement respectively, be used for according to second comparative result of subelement relatively, when described ratio was higher than the described second judgement threshold value, output was given the number of declaring unit to high-frequency signal that should ratio.

The described number of declaring unit specifically comprises:

First declares the work song unit, be connected with high frequency group energy measuring subelement with described low frequency group energy measuring subelement respectively, be used for determining corresponding number information respectively according to each detected low frequency signal of low frequency group energy measuring subelement and the each detected high-frequency signal of high frequency group energy measuring subelement;

Second declares the work song unit, declares the work song unit and is connected with described first, and whether being used for comparison first, to declare the number information that the adjacent priority in work song unit determines for twice consistent, if, export this unanimity number information, continue the detection of next numerical signal then; Otherwise use back time number information to upgrade last time and carry out follow-up comparison process again behind the number information.

Described first declares the work song unit specifically comprises:

The directory storing sub-units is used to store the directory that can index a corresponding number information according to a high-frequency signal and low frequency signal;

Number is differentiated subelement, be connected with the directory storing sub-units with described low frequency group energy measuring subelement, high frequency group energy measuring subelement respectively, be used for the high-frequency signal that the low frequency signal sent according to low frequency group energy measuring subelement and high frequency group energy measuring subelement are sent, call number code table storing sub-units inquires corresponding number information.

Described second declares the work song unit specifically comprises:

Number receives subelement, declares the work song unit and is connected with described first, is used to receive first and declares the number information that the work song unit is sent at every turn;

Number buffer memory subelement receives subelement with described number and is connected, and is used for the buffer memory number and receives the number information that subelement the last time receives;

Number information is subelement relatively, receiving subelement with described number respectively is connected with number buffer memory subelement, whether being used for the comparison number, to receive the number information that subelement newly receives consistent with the number information of number buffer memory subelement buffer memory, if continuation detects next number information; Otherwise the number information that uses number reception subelement newly to receive removes to upgrade the number information of number buffer memory subelement buffer memory;

Number output subelement compares subelement with described number information and is connected, and is used for exporting when the comparative result of number information comparison subelement is consistent this unanimity number information.

The length of described each touch-tone signal is C, and the pass between the afterbody measured signal length B of a last detection window of described C and detection window measured signal length A and buffer memory is: 3A-2B≤C.

Correspondingly, the invention allows for a kind of number detection method, be used for the number information that detection signal carries, comprise step:

(A) receive measured signal;

(B) filter out the frequency range group's measured signal that is in different frequency range to received signal;

(C) respectively different frequency range group measured signal is caught the first detection window measured signal that length is A after, on the follow-up buffer memory respectively in the detection window length be the afterbody measured signal of B, with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

(D) each the detection window measured signal that constructs at the different frequency range group respectively carries out energy measuring, to detect the highest frequency signal of energy in each detection window measured signal;

(E) simultaneously according to determining corresponding number information at the detected frequency signal of different frequency range group's detection window measured signal, and when the number information unanimity that priority at least twice is determined, export this unanimity number information, continue the detection of next number information then and handle.

The beneficial effect that the present invention can reach is as follows:

1) signal supervisory instrument of the present invention and method thereof propose the measured signal that receives is carried out overlapping buffered, so that the part measured signal can overlappingly become the head measured signal of the afterbody measured signal of a last detection window and next detection window is detected twice, therefore improved the accuracy of detection of measured signal; Especially more remarkable for being applied in its accuracy of detection of dtmf signal that dialing is handled in the communication process.

2) number checkout gear of the present invention and method thereof propose the measurement information for the treatment of of carrying number information is carried out overlapping buffered based on the signal supervisory instrument and the method thereof of the above-mentioned proposition of the present invention, so that in carrying the measured signal length of a number information, can construct the complete detection window of at least two suitable lengths, can make the number of declaring unit that jack per line information is carried out at least twice judgement like this, when priority twice comparative result is consistent, to export this consistent number information at least again, therefore improved the precision that the measured signal that carries number information is detected, especially for being applied in the dtmf signal that dialing is handled in the communication process, not only can improve its number accuracy of detection, and resist user's easy defective that forms the phonetic dialing mistake in dialing procedure preferably.

Description of drawings

Fig. 1 is a DTMF directory schematic diagram commonly used at present;

Fig. 2 is the concrete composition structure and the input principle schematic thereof of existing dtmf signal checkout equipment;

Fig. 3 is that existing dtmf signal checkout equipment uses the 20ms detection window dtmf signal to be intercepted the schematic diagram of processing;

Fig. 4 is the primary structure composition frame chart of signal supervisory instrument of the present invention;

Fig. 5 is the concrete structure composition frame chart of overlapping buffer cell in the signal supervisory instrument of the present invention;

Fig. 6 is that detection window is caught the concrete structure block diagram that subelement inside comprises in the signal supervisory instrument of the present invention;

Fig. 7 is the specific implementation principle flow chart of signal detecting method of the present invention;

Fig. 8 is a main realization principle flow chart of realizing the signal overlap buffering in the signal detecting method of the present invention;

Fig. 9 is the main composition structured flowchart of number checkout gear of the present invention;

Figure 10 is the concrete composition structured flowchart that number checkout gear of the present invention is applied to dtmf signal is detected the embodiment of the number of declaring;

Figure 11 is the concrete composition structured flowchart that number checkout gear of the present invention is applied in the low frequency group energy measuring subelement in the DTMF number testing process;

Figure 12 is the concrete composition structured flowchart that number checkout gear of the present invention is applied in the high frequency group energy measuring subelement in the DTMF number testing process;

Figure 13 is that number checkout gear of the present invention is applied in the concrete composition structured flowchart that first in the DTMF number testing process declared the work song unit;

Figure 14 is that number checkout gear of the present invention is applied in the concrete composition structured flowchart that second in the DTMF number testing process declared the work song unit;

Figure 15 is carrying out in the testing process dtmf signal, uses the 13.3ms signal length to make the embodiment schematic diagram of detection window;

Figure 16 utilizes overlapping cushioning principle to realize using the 20ms detection window to realize the schematic diagram of the secondary number of declaring function after being to use number checkout gear of the present invention;

Figure 17 is the main realization principle flow chart of number detection method of the present invention.

Embodiment

From above-mentioned prior art as can be seen, dtmf signal is being detected in the process of number, the signal that 20ms will be arranged in the dtmf signal of 40ms has not been done invalid detection and has been wasted and (refers to generally speaking owing to crossing thresholding, because best-case seldom occurs), and the general time that occurs of the situation that contains the DTMF frequency in the user speech is also all very short, that is to say, if comprised the DTMF frequency of 20ms in a people's the voice, then be easy to and be detected, form phonetic dialing.

For resisting the problem of above-mentioned easy formation phonetic dialing, that the window of detection window can be opened is littler, to realize detecting two complete detection window in the dtmf signal of 40ms; It is more little that but detection window is opened, and then the information that comprises in the window is also just few more, detects inaccurate more, for can distinguish frequency deviation that GB stipulates be 2% and frequency deviation be 3% signal, then detection window is can not Kai Detai little; And that detection window is opened is big more, and then the input precision is high more, but since in the GB regulation dtmf signal the shortest be 40ms length, so that detection window can not be opened is too big.

The objective of the invention is by improving the testing mechanism of whole signal, " overlapping buffering " mode of employing realizes " the secondary number of declaring " processing, with the accuracy of detection of raising, thereby realize that the user improves the antagonism to phonetic dialing in dialing procedure to the dtmf signal of 40ms.Wherein the notion of " overlapping buffering " is meant earlier the tail signal in the measured signal of input is carried out buffer-stored, then the tail signal of buffer-stored and the measured signal of back is heavily reached next detection window signal; Such as detection window is the size of 100 points, after having cushioned 100 points, to the detection window input once, then last 20 points of this detection window is carried out buffer-stored like this, waits for the measured signal of back, calculates once behind full 100 points again.Like this, it is overlappingly (promptly to have participated in twice detection that 20 points are arranged in the actual each detection window that detects, only need 80 some measured signals of input this moment at every turn, but detection window still is the length of 100 points), therefore can be implemented in and make detection window obtain strengthening under the constant situation of dtmf signal length, thereby improved signal detection accuracy.

According to above-mentioned principle, the present invention proposes a kind of signal supervisory instrument and signal detecting method thereof.

At first be explained in detail below in conjunction with the embodiment of each accompanying drawing to signal supervisory instrument of the present invention.See also Fig. 4, this figure is the primary structure composition frame chart of signal supervisory instrument of the present invention; Signal supervisory instrument wherein of the present invention specifically comprises:

Signal receiving unit 1 is used for from external world's reception measured signal;

Overlapping buffer cell 2, be connected with signal receiving unit 1, be used for after catching the first detection window measured signal that length is A, on the follow-up buffer memory respectively in the detection window length be B (the afterbody measured signal of A＞B), with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

Detecting signal unit 3 is connected with overlapping buffer cell 2, and each length that is used for respectively overlapping buffer cell 2 being constructed is that the detection window measured signal of A detects.

See also Fig. 5, this figure is the concrete structure composition frame chart of overlapping buffer cell in the signal supervisory instrument of the present invention; Wherein overlapping buffer cell specifically comprises:

Detection window is caught subelement 21, is connected with signal receiving unit 1, is used to catch the detection window measured signal that each length is A;

Buffer memory subelement 22, the afterbody measured signal that to be used for a last detection window length that buffer memory constructs be B;

Detection window constructor unit 23, catching subelement 21, buffer memory subelement 22 and detecting signal unit 3 with detection window respectively is connected, it is the head measured signal of S=A-B that afterbody measured signal that a last detection window length that is used for extracting respectively buffer memory subelement 22 buffer memorys is B and detection window are caught the detection window measured signal length that subelement 21 catches, to construct next detection window measured signal (length still is B+A-B=A);

Signal intercepting subelement 24, be connected with buffer memory subelement 22 with detection window constructor unit 23 respectively, each the detection window measured signal intercepted length that is used for detection window constructor unit 23 is constructed is the afterbody measured signal of B, and is that the afterbody measured signal of B is sent into and carried out buffer memory in the buffer memory subelement 22 with the length of intercepting.

See also Fig. 6, this figure is that detection window is caught the concrete structure block diagram that subelement inside comprises in the signal supervisory instrument of the present invention; Wherein detection window is caught subelement and is specifically comprised:

Judging unit 211, be used for after detection window is caught the subelement 21 detection window measured signal that to catch a length be A, after detection window constructor unit 23 extraction length are the measured signal of S=A-B, judge the magnitude relationship of residue measured signal length and S=A-B at every turn;

Trigger element 212 is connected with judging unit 211, is used for when judging unit 211 is judged residue measured signal length less than S=A-B, and detection trigger window capture subelement 21 is caught the processing that next length is the detection window measured signal of A.

Corresponding to the above-mentioned signal supervisory instrument of the present invention, the invention allows for a kind of signal detecting method, see also Fig. 7, this figure is the specific implementation principle flow chart of signal detecting method of the present invention; Its main implementation procedure is as follows:

Step S1 receives measured signal from the external world;

Step S2, catching length in above-mentioned received signal is the first detection window measured signal of A;

Step S3, length is the afterbody measured signal of B in the last detection window measured signal of follow-up buffer memory respectively structure, with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

Wherein the specific implementation process of step S3 sees also Fig. 8, and this figure is a main realization principle flow chart of realizing the signal overlap buffering in the signal detecting method of the present invention; Its main process comprises:

Step S31, length of buffer memory spacing wave that is B in advance;

Step S32, catching first length is the detection window measured signal of A;

Step D33, the length of buffer memory is that length is the head measured signal of S=A-B in the detection window measured signal of catching among the spacing wave of B and the step S32 among the extraction step S31 respectively, to construct first detection window measured signal (the detection window length of being constructed is B+A-B=A);

Step S34, length is the afterbody measured signal of B in first detection window measured signal of being constructed among the intercepting step S33, and is that the afterbody measured signal of B carries out buffer memory with the length of intercepting;

Whether step S35 judges the residue measured signal length of catching more than or equal to S=A-B, if, execution in step S37; Otherwise execution in step S36;

Step S36 continues to catch the detection window measured signal that next length is A, execution in step S37 then;

Step S37, the length of extracting buffer memory respectively is that length is the head measured signal of S=A-B in the afterbody measured signal of B and the detection window measured signal of catching, to construct next detection window measured signal;

Step S38, length is the afterbody measured signal of B in this next detection window measured signal of constructing among the intercepting step S37, and is after the afterbody measured signal of B carries out buffer memory, to return and continue execution in step S35 with the length of intercepting.

Please continue with reference to Fig. 7, in step S4, respectively each the detection window measured signal that constructs among the step S3 be detected processing, thereby finish the signal detection process of signal detecting method of the present invention at last.

Realization principle according to above-mentioned signal supervisory instrument and signal detecting method thereof, the present invention has proposed number checkout gear and number detection method thereof then, to be directed to existing dtmf signal is detected the processing procedure a kind of number of declaring precision height of proposition of the number of declaring and can resist the number detection mode that forms phonetic dialing in dialing procedure, but number checkout gear of the present invention and number detection method thereof are not limited to be applied in dtmf signal are detected the number of declaring, and can also be applied in the processing procedure that other signals is detected the number of declaring.

Be described in detail below in conjunction with the specific implementation process of each accompanying drawing number checkout gear of the present invention.See also Fig. 9, this figure is the main composition structured flowchart of number checkout gear of the present invention; The chief component of number checkout gear of the present invention comprises:

Signal receiving unit 10 is used to receive extraneous measured signal;

Filter unit 20 is connected with signal receiving unit 10, and the filtering signals source that is used for receiving element 10 is received is in frequency range group's measured signal of different frequency range;

Overlapping buffer cell 30, be connected with filter unit 20, after the different frequency range group measured signal that is used for respectively filter unit 20 being filtered out is caught the first detection window measured signal that length is A, length is the afterbody measured signal of B in the last detection window measured signal of follow-up buffer memory respectively structure, with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

Signal energy detecting unit 40, be connected with overlapping buffer cell 30, each the detection window measured signal that is used for respectively overlapping buffer cell 30 being constructed at the different frequency range group carries out energy measuring to be handled, to detect the highest frequency signal of energy in each detection window measured signal;

The number of declaring unit 50, be connected with signal energy detecting unit 40, be used for determining at the detected frequency signal of different frequency range group detection window measured signal according to signal energy detecting unit 40 simultaneously the number information of a correspondence, and when the number information unanimity that priority at least twice is determined, export this consistent number information, continue the detection of next number information then and handle.

The processing procedure that is applied to dtmf signal is detected the number of declaring with number checkout gear of the present invention is an example below, and the concrete operation principle process of number checkout gear of the present invention is described in detail.Because mainly comprise low frequency group and two frequency range groups of high frequency group part in the existing dtmf signal, wherein the low frequency group part mainly comprises 697Hz, 770Hz, 852Hz and four low frequency signals of 941Hz, and the high frequency group part mainly comprises 1209Hz, 1336Hz, 1477Hz and four high-frequency signals of 1633Hz.

See also Figure 10, this figure is the concrete composition structured flowchart that number checkout gear of the present invention is applied to dtmf signal is detected the embodiment of the number of declaring, number checkout gear of the present invention is applied to the filter unit 20 of the dtmf signal detection number of declaring is specifically comprised IIR band pass filter 201 (iir filter is an IIR filter, Infinite Impulse Response Filter) and IIR high pass filter 202; Overlapping buffer cell 30 specifically comprises the 301 and second overlapping buffer sublayer unit 302, the first overlapping buffer sublayer unit; Signal energy detecting unit 40 specifically comprises low frequency group energy measuring subelement 401 and high frequency group energy measuring subelement 402; The number of declaring unit 50 comprises that specifically first declares work song unit 501 and second and declare work song unit 502; Wherein the concrete effect of each part is as follows:

IIR band pass filter 201 is connected with signal receiving unit 10, is used for filtering out the low frequency group measured signal of the dtmf signal of reception;

IIR high pass filter 202 is connected with signal receiving unit 10, is used for filtering out the high frequency group measured signal of the dtmf signal of reception;

The first overlapping buffer sublayer unit 301, be connected with IIR band pass filter 201, be used for after catching the first detection window low frequency group measured signal that length is A, length is the afterbody measured signal of B in the last detection window measured signal of follow-up buffer memory respectively structure, with follow-up length be that the low frequency group measured signal of S=A-B constitutes next detection window low frequency group measured signal;

The second overlapping buffer sublayer unit 302, be connected with IIR high pass filter 202, be used for after catching the first detection window high frequency group measured signal that length is A, length is the afterbody measured signal of B in the last detection window measured signal of follow-up buffer memory respectively structure, with follow-up length be that the high frequency group measured signal of S=A-B constitutes next detection window high frequency group measured signal;

Low frequency group energy measuring subelement 401 is connected with the first overlapping buffer sublayer unit 301, is used for detecting respectively the highest low frequency signal of sending the first overlapping buffer sublayer unit 301 of each detection window low frequency group measured signal energy; Wherein low frequency group energy measuring subelement 401 can adopt discrete Fourier transform (DFT) algorithm or Goertzel algorithm respectively the highest low frequency signal of energy in each detection window low frequency group measured signal to be detected;

High frequency group energy measuring subelement 402 is connected with the second overlapping buffer sublayer unit 302, is used for detecting respectively the highest high-frequency signal of sending the second overlapping buffer sublayer unit 302 of each detection window high frequency group measured signal energy; Wherein high frequency group energy measuring subelement 402 also can adopt discrete Fourier transform (DFT) algorithm or Goertzel algorithm respectively the highest high-frequency signal of energy in each detection window high frequency group measured signal to be detected;

First declares work song unit 501, be connected with high frequency group energy measuring subelement 402 with low frequency group energy measuring subelement 401 respectively, be used for determining corresponding number information respectively according to low frequency group energy measuring subelement 401 each detected low frequency signals and high frequency group energy measuring subelement 402 each detected high-frequency signals;

Second declares work song unit 502, declare work song unit 501 and be connected with first, whether being used for comparison first, to declare the number information that work song unit 501 adjacent priorities determine for twice consistent, if, export this consistent number information, continue the detection of next numerical signal then and handle; Otherwise after using back time definite number information to upgrade the number information of last time determining, carry out follow-up comparison process again, up to finding out consistent number information.

Above-mentioned enforcement mainly is for judging whether also detected identical number information in the previous detection window to the effect that dtmf signal carries out the secondary number of declaring, have only continuous two detection window to detect same number information and just report this consistent number information, to improve DTMF number accuracy of detection.

See also Figure 11, this figure is the concrete composition structured flowchart that number checkout gear of the present invention is applied in the low frequency group energy measuring subelement in the DTMF number testing process, and wherein the concrete composition of low frequency group energy measuring subelement comprises:

The first threshold value storing sub-units 4011 is used for according to the length A setting of detection window measured signal and stores one first judgement threshold value S ₁

Low frequency group energy computation subunit 4012, be connected with the first overlapping buffer sublayer unit 301, be used for calculating the energy value of each each low frequency of detection window low frequency group measured signal of sending the first overlapping buffer sublayer unit 301 and the total energy value of each detection window low frequency group measured signal; And the ratio K between the total energy value of the energy value that calculates the highest low frequency signal of each detection window self-energy and corresponding detection window low frequency group measured signal ₁

First compares subelement 4013, is connected with low frequency group energy computation subunit 4012 with the first threshold value storing sub-units 4011 respectively, is used for the ratio K that low frequency group energy computation subunit 4012 is calculated at each detection window low frequency group measured signal ₁The first judgement threshold value S with 4011 storages of the first threshold value storing sub-units ₁Compare;

Low frequency signal output subelement 4014 is connected with the number of declaring unit 50 with the first comparison subelement 4013 respectively, is used for the comparative result according to the first comparison subelement 4013, in ratio K ₁Be higher than the first judgement threshold value S ₁The time, output is to should ratio K ₁Low frequency signal give the number of declaring unit 50.

In like manner, see also Figure 12, this figure is the concrete composition structured flowchart that number checkout gear of the present invention is applied in the high frequency group energy measuring subelement in the DTMF number testing process, and wherein the concrete composition of high frequency group energy measuring subelement comprises:

The second threshold value storing sub-units 4021 is used for according to the length A setting of detection window measured signal and stores one second judgement threshold value S ₂

High frequency group energy computation subunit 4022, be connected with the second overlapping buffer sublayer unit 302, be used for calculating the energy value of each each high frequency of detection window high frequency group measured signal of sending the second overlapping buffer sublayer unit 302 and the total energy value of each detection window high frequency group measured signal; And the ratio K between the total energy value of the energy value that calculates the highest high-frequency signal of each detection window self-energy and corresponding detection window high frequency group measured signal ₂

Second compares subelement 4023, is connected with high frequency group energy computation subunit 4022 with the second threshold value storing sub-units 4021 respectively, is used for the ratio K that high frequency group energy computation subunit 4022 is calculated at each detection window high frequency group measured signal ₂The second judgement threshold value S with 4021 storages of the second threshold value storing sub-units ₂Compare;

High-frequency signal output subelement 4024 is connected with the number of declaring unit 50 with the second comparison subelement 4023 respectively, is used for the comparative result according to the second comparison subelement 4023, in ratio K ₂Be higher than the second judgement threshold value S ₂The time, output is to should ratio K ₂High-frequency signal give the number of declaring unit 50.

By as can be seen to the introduction of the concrete composition structure of above-mentioned low frequency group energy measuring subelement 401 and high frequency group energy measuring subelement 402, adopt discrete Fourier transform (DFT) algorithm or Goertzel algorithm can calculate the energy value of some frequencies in a certain section dtmf signal, if again than the total energy value of last this section dtmf signal, just can obtain the ratio value situation that this frequency takies in whole signal, when this ratio during, just can think to have detected this frequency greater than a certain judgement threshold.For example: need be in the signal of 20ms (160 points) detection whether contain the frequency of 1KHz, then need import " 1KHz " and " signal of 20ms " two parameters and carry out the Goertzel interative computation, to calculate the energy of 1KHz, and then calculating the gross energy that 20ms puts in order segment signal, two energy values that will calculate at last compare; Promptly when the measured signal in the detection window is calculated, calculate the total energy value of this segment signal earlier, and then calculate the energy value of 1KHz signal in this segment signal, if the energy of the 1KHz signal that calculates is high more, illustrate that then the proportion that the energy of 1KHz signal accounts for is just high more in the gross energy of this segment signal, after proportion reaches certain thresholding, can think that then this segment signal has been exactly the signal of 1KHz, if contain the signal of other frequencies, then this ratio can descend, if frequency is inclined to one side more in addition (for example be not 1KHz signal but 1050Hz signal), then this ratio also can descend.

See also Figure 13, this figure is that number checkout gear of the present invention is applied in the concrete composition structured flowchart that first in the DTMF number testing process declared the work song unit, and wherein this first concrete composition of declaring the work song unit comprises:

Directory storing sub-units 5011 is used to store the directory that can index a corresponding number information according to a DTMF high-frequency signal and DTMF low frequency signal;

Number is differentiated subelement 5012, be connected with directory storing sub-units 5011 with low frequency group energy measuring subelement 401, high frequency group energy measuring subelement 402 respectively, be used for the DTMF high-frequency signal that the DTMF low frequency signal sent according to low frequency group energy measuring subelement 401 and high frequency group energy measuring subelement 402 are sent, come call number code table storing sub-units 5011, inquire corresponding number information.

See also Figure 14, this figure is that number checkout gear of the present invention is applied in the concrete composition structured flowchart that second in the DTMF number testing process declared the work song unit, and wherein this second concrete composition of declaring the work song unit comprises:

Number receives subelement 5021, declares work song unit 501 and is connected with first, is used to receive first and declares the number information that work song unit 501 is sent at every turn;

Number buffer memory subelement 5022 receives subelement 5021 with number and is connected, and is used for the buffer memory number and receives the number information that 5021 the last times of subelement receive;

Number information is subelement 5023 relatively, receiving subelement 5021 with number respectively is connected with number buffer memory subelement 5022, whether being used for the comparison number, to receive the number information that subelement 5021 newly receives consistent with the number information of number buffer memory subelement 5022 buffer memorys, if continue next number information is detected processing; Otherwise the number information that uses number reception subelement 5021 newly to receive removes to upgrade the last number information of number buffer memory subelement 5022 buffer memorys;

Number output subelement 5024, comparing subelement 5023 with number information is connected, be used for comparing the comparative result of subelement 5023 according to number information, receive number information that subelement 5021 newly receives when consistent at number, export this consistent number information with the number information of number buffer memory subelement 5022 buffer memorys.

Infer according to repeatedly theoretical, can obtain: when the length of each dtmf signal is C (being generally 40ms), then the relation between the afterbody measured signal length B of a last detection window of the length A of C and detection window measured signal and buffer memory meets relational expression: 3A-2B≤C.

To be explained in detail the superiority of number checkout gear of the present invention with specific embodiment below with respect to prior art.

See also Figure 15, this figure is carrying out in the testing process dtmf signal, use the 13.3ms signal length to make the embodiment schematic diagram of detection window, because the shortest length of dtmf signal is 40ms in GB, if the employing secondary number of declaring mode can be so that the number detection be more accurate, but the secondary number of declaring mode also has certain requirement to the length of detection window signal, and promptly the detection window signal is too short then is not suitable for the secondary number of declaring.

Because the secondary number of declaring mode requires in the ordinary course of things, can in the dtmf signal of 40ms, capture two complete detection window signals, so that can both differentiate a DTMF number information by each detection window, determine whether exporting this number information by two detected DTMF number informations of detection window relatively are whether consistent then, to improve the precision that number detects.Yet will be in the dtmf signal of 40ms complete capture two detection window, detection window length maximum can not surpass 40/3=13.3ms; Anti-speech, when promptly having only detection window length to be not more than 13.3ms, could capture two complete detection window to the dtmf signal of 40ms continuously, as shown in figure 15: wherein the length 13.3ms of detection window is (40/3) of calculating, if promptly the dtmf signal of 40ms length need be by under any circumstance all complete the capturing twice of detection window that be X of a size, then the big or small X maximum of this detection window can not surpass 13.3ms, if detection window length has surpassed 13.3ms, in Figure 15, shown in " best-case ", if it is big that middle 13.3ms detection window becomes, the detection window on both sides also enlarges outward, this detection window is complete in the middle of then just having only, and two detection window of head and the tail have been not complete detection window then.To sum up promptly do not use number checkout gear of the present invention, realize the secondary number of declaring mode, then need the big or small maximum of detection window is reached 13.3ms, comparatively speaking, the number of declaring mode realizes that the 20ms detection window of the number of declaring purpose is much smaller to the detection window length of this 13.3ms with respect to using once in the prior art, so the number accuracy of detection is with respect to using big detection window to hang down.

See also Figure 16, this figure utilizes overlapping cushioning principle to realize using the 20ms detection window to realize the schematic diagram of the secondary number of declaring function after being to use number checkout gear of the present invention; By the overlapping cushioning principle that the present invention proposes, can realize making the length of detection window to surpass 13.3ms, can also reach the purpose of the dtmf signal of a 40ms being carried out the secondary number of declaring.Illustrate in the background technology, when detection window length is 20ms, in the dtmf signal of 40ms, can only guarantee the complete detection window signal that captures a 20ms generally speaking.As shown in figure 16, if adopt overlapping cushioning principle that the dtmf signal of 40ms is carried out overlapping buffering, when number detects, dtmf signal from buffering area extraction 20ms detects at every turn, after detection is finished, the signal with this 20ms does not abandon fully, but being put back to buffering area again, back part signal keeps, as the beginning part of next detection window information, in fact overlapping this part signal is successively detected twice: promptly as the end signal of last detection window with as the beginning signal of detection window next time.So in fact, the dtmf signal equivalence of 40ms length is become effective detection length for 60ms, and wherein a part of signal carries out overlapping, so in fact, the detection window signal that detects 3 20ms (under the best-case) that can be complete in the dtmf signal of 40ms, and also can completely detect the detection window signal of twice 20ms generally speaking, thereby can guarantee under the detection window length of 20ms, can reach the purpose of the secondary number of declaring.

Through mathematical computations, the conversion relation that can obtain between signal overlap length, detection window size and the signal physical length is:

If the signal physical length is C, detection window size is A, the signal overlap size is B, then satisfies 3A-2B≤C, in dtmf signal, C=40ms, A=20ms then can obtain B 〉=10ms by this relational expression, promptly in the dtmf signal of 40ms length, as long as the signal of each overlapping buffering 10ms then just can realize utilizing the detection window of 20ms length to reach the purpose of the simple gate limit secondary number of declaring.

In actual applications, the size of overlapped signal can determine that overlapped signal is long more according to actual conditions, and then detection is accurate more, but operand is also big more simultaneously.

Corresponding to the number checkout gear of the above-mentioned proposition of the present invention, the invention allows for a kind of number detection method, see also Figure 17, this figure is the main realization principle flow chart of number detection method of the present invention; Its main implementation procedure comprises:

Step S100 receives measured signal from the external world;

Step S200 filters out the frequency range group's measured signal that is in different frequency range to received signal;

Step S300, after respectively the different frequency range group measured signal that filters out among the step S200 being caught the first detection window measured signal that length is A, length is the afterbody measured signal of B in the last detection window of follow-up buffer memory respectively structure, with follow-up length be that the measured signal of S=A-B constitutes next detection window measured signal;

Step S400 carries out energy measuring to each the detection window measured signal that among the step S300 different frequency range group is constructed respectively, to detect the highest frequency signal of energy in each detection window measured signal;

Step S500, simultaneously according to determining corresponding number information at the detected frequency signal of different frequency range group's detection window measured signal among the step S400, and when the number information unanimity that priority at least twice is determined, export this consistent number information, continue the detection of next number information then and handle.

Wherein above-mentioned number detection method is applicable to but is not limited to be applied in dtmf signal is detected the number of declaring processing, wherein dtmf signal mainly comprises high frequency group and two frequency range groups of low frequency group, its concrete performance, is no longer too much given unnecessary details at the application principle that dtmf signal is detected in the number of the declaring processing procedure here with reference to above-mentioned number checkout gear.

In like manner, infer according to repeatedly theoretical, can obtain: when the length of each dtmf signal is C (being generally 40ms), then the relation between the afterbody measured signal length B of a last detection window of the length A of C and detection window measured signal and buffer memory meets relational expression: 3A-2B≤C.

The number checkout gear and the number detection method thereof of the above-mentioned proposition of the present invention all can be moved in fixed network, wireless 3G network and media product at present, and through confirming after the test of many times that this devices and methods therefor is feasible, can improve the accuracy of detection of DTMF number very effectively, the opposing user causes the problem of phonetic dialing easily in dialing procedure.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1, a kind of signal supervisory instrument is characterized in that, comprising:

Signal receiving unit is used to receive measured signal;

2, signal supervisory instrument as claimed in claim 1 is characterized in that, described overlapping buffer cell specifically comprises:

3, signal supervisory instrument as claimed in claim 2 is characterized in that, described detection window is caught in the subelement and also comprised:

4, a kind of signal detecting method is characterized in that, comprises step:

Receive measured signal;

5, signal detecting method as claimed in claim 4 is characterized in that, described step (2) specifically comprises step:

(21) buffer memory one length is the spacing wave of B in advance;

(22) catch the detection window measured signal that length is A;

6, signal detecting method as claimed in claim 5, it is characterized in that, before the detection window measured signal that extraction is caught, also comprise step in the described step (25): judge that whether the residue measured signal length of catching is more than or equal to S=A-B, if carry out the processing of extracting the detection window measured signal of catching; Otherwise carry out the processing of extracting the detection window measured signal of catching again after catching next length and be the detection window measured signal of A.

7, a kind of number checkout gear is used for the number information that detection signal carries, and it is characterized in that, comprising:

Signal receiving unit is used to receive measured signal;

8, number checkout gear as claimed in claim 7 is characterized in that, described measured signal is a touch-tone signal; Described touch-tone signal comprises high frequency group and two frequency range groups of low frequency group.

9, number checkout gear as claimed in claim 8 is characterized in that, described filter unit specifically comprises:

10, number checkout gear as claimed in claim 9 is characterized in that, described overlapping buffer cell specifically comprises:

11, number checkout gear as claimed in claim 10 is characterized in that, described signal energy detecting unit specifically comprises:

12, number checkout gear as claimed in claim 11 is characterized in that, described low frequency group energy measuring subelement specifically comprises:

13, number checkout gear as claimed in claim 11 is characterized in that, described high frequency group energy measuring subelement specifically comprises:

14, number checkout gear as claimed in claim 11 is characterized in that, the described number of declaring unit specifically comprises:

15, number checkout gear as claimed in claim 14 is characterized in that, described first declares the work song unit specifically comprises:

16, number checkout gear as claimed in claim 14 is characterized in that, described second declares the work song unit specifically comprises:

17, as any described number checkout gear of claim of claim 8～16, it is characterized in that, the length of described each touch-tone signal is C, and the pass between the afterbody measured signal length B of a last detection window of described C and detection window measured signal length A and buffer memory is: 3A-2B≤C.

18, a kind of number detection method is used for the number information that detection signal carries, and it is characterized in that, comprises step:

(A) receive measured signal;

19, number detection method as claimed in claim 18 is characterized in that, described measured signal is a touch-tone signal; Described touch-tone signal comprises high frequency group and two frequency range groups of low frequency group.

20, number checkout gear as claimed in claim 19, it is characterized in that, the length of described each touch-tone signal is C, and the pass between the afterbody measured signal length B of a last detection window of described C and detection window measured signal length A and buffer memory is: 3A-2B≤C.