CN1553679A - Incoming telephone displaying service realizing method - Google Patents
Incoming telephone displaying service realizing method Download PDFInfo
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- CN1553679A CN1553679A CNA031318045A CN03131804A CN1553679A CN 1553679 A CN1553679 A CN 1553679A CN A031318045 A CNA031318045 A CN A031318045A CN 03131804 A CN03131804 A CN 03131804A CN 1553679 A CN1553679 A CN 1553679A
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Abstract
This invention provides a method for implementing caller number display. It includes following steps: accord to the command of the external CPU of origine exchange the terminal exchange dispatches a caller number display signal; uses the table look up method to make modulation process for the caller number display; transmits the modulated caller number display to the called side; the terminal device of the called side completes the caller number display. The invention provides a method that occupies less storage space and has faster operational speed. It uses generic DSP, so its cost is lower than specific chip and circuit. On the other side, because the core of the integrated access equipment is also a DSP, so there is no need to equip with exclusive DSP, it also makes the cost lower.
Description
Technical field
The present invention relates to a kind of method that on integrated access equipment and digital SPC exchange, realizes the caller identification business, particularly relate to a kind of method that on the nextport universal digital signal processor NextPort hardware platform, realizes caller identification generation and sending function.
Background technology
The caller identification business provides caller number display for the user, its basic implementation method be make a start switch with calling number etc. by signaling system (for example NO.7 signaling), send terminaling exchange to.Terminaling exchange is given called user terminal equipment with caller identification information in the mode of frequency shift keying (FSK).
Realize that this professional prerequisite is that integrated access equipment or switch must possess the function that produces and send the incoming call shows signal.
In order to realize above-mentioned functions, comprehensive switching equipment or switch must possess signal modulation function, promptly must satisfy the related request among the internal standard YDN-1997 of the Ministry of Posts and Telecommunications " specification requirement and the method for testing (temporary provisions) of transmission of phone caller identification information and Presentation Function ":
This standard code switch need be with user profile, for example calling number, caller date and time, mode according to the continuous binary frequency shift keying of phase place is modulated, the baud rate of modulation signal is 1200 bps, logical zero adopts the 2200Hz sinusoidal signal to represent, logical one adopts the 1200Hz sinusoidal signal to represent that frequency error is no more than 1%; In the on-hook data transmitted, switch need begin to send the incoming call shows signal in 0.5 second-1.5 seconds after first ring finishes.This signal composed as follows at first is 300 continuous " 0 " and " 1 " as the channel occupancy signal, and wherein first is 0, and last position is 1; Be 180 continuous " 1 " of signal as a token of then; Then be data message, data message is 8 bit data; Be check word at last, check word be all data messages with negate after low eight bit data.Data message and verification and will add 1 before a high position before transmission add 0 behind low level, and begin to send from lowest order.
In the prior art, integrated access equipment and switch are realized above-mentioned signal modulation function by special chip or special circuit, and wherein the part special chip adopts DSP nuclear (the CPU part in the general dsp device) to realize the generation and the transmission of caller identification signal.
But the functional mode of proprietary chip or proprietary circuit is single, can not flexible configuration; And external interface can not arbitrarily change, thereby can not be called by other module as a kind of general resource.
In view of the defective of above prior art, the present invention is based on nextport universal digital signal processor NextPort hardware platform give me a little the display business implementation method.
Summary of the invention
Purpose of the present invention overcomes the defective of above-mentioned prior art just, this method provides a kind of caller identification service implementation method, utilize special chip or special circuit in nextport universal digital signal processor NextPort (DSP) replacement integrated access equipment and the switch, realize the modulation of caller identification signal, thereby finish the caller identification business.
In order to achieve the above object, the invention provides a kind of caller identification service implementation method, this method may further comprise the steps:
Terminaling exchange sends the incoming call shows signal according to making a start the order of switch outer CPU;
Utilize look-up table that the caller identification signal data is carried out modulation treatment;
Caller identification signal data after called end transmits modulation; And
The called end terminal equipment is finished caller identification business, EP (end of program).
The invention provides that a kind of to take memory space little, the caller identification service implementation method of fast operation; Because nextport universal digital signal processor NextPort is a kind of general-purpose chip, it is with respect to special chip and special circuit, and is with better function, and price is more cheap; On the other hand, because the speech processes core of integrated access equipment also is a digital signal processor, so do not need to be equipped with separately digital signal processor, cost can be more cheap again.
Below in conjunction with embodiment, and be elaborated, so that purpose of the present invention, feature and advantage are had more deep understanding with reference to accompanying drawing.
Description of drawings
Fig. 1 is a caller identification service implementation method flow chart provided by the present invention.
Fig. 2 is an embodiment of the invention operational flowchart.
Fig. 3 is an embodiment of the invention oscillogram.
Embodiment
As shown in Figure 1, be the flow chart of caller identification service implementation method provided by the present invention, at first,, send the incoming call shows signal, step 101 according to the order of calling terminal outer CPU; Utilize look-up table that the caller identification signal data is carried out modulation treatment, step 102; Send the caller identification signal data of electrical signal data transmission after modulation, step 103 to called end; Called end is finished caller identification business, EP (end of program), step 104.
In the above-mentioned flow process, adopt the nextport universal digital signal processor NextPort hardware platform to realize that its PCM serial line interface is finished the output of caller identification signal; Control interface is used to handle outer CPU control and response are downloaded, ordered to the code of dsp chip.Itself and extraneous interface can be set as required flexibly, or it is called by other module as a generic resource.As can be according to actual needs on a slice dsp chip, realize tens the tunnel in addition the caller identification signal on roads up to a hundred send; Also can realize other function except caller identification on a slice dsp chip, functions such as for example encoding and decoding speech, echo suppress, DTMF transmitting-receiving number are so that can make full use of the DSP efficient resource.
Certainly, the present invention also can adopt other processor such as single-chip microcomputer to realize, only DSP is because the support of special instruction and addressing system has higher operational efficiency.
Lift a specific embodiment below, technical scheme of the present invention is described.
Present embodiment has utilized the relation of caller identification signal baud rate and PCM sample frequency, represents 3 binary digits with 20 sampled points, has guaranteed the phase place continuation property of caller identification signal fully.Simultaneously, in order to save the storage space that expends, bit 0 usefulness 2200Hz of the present invention represents, bit 1 usefulness 1200Hz represents and the relation of PCM sample frequency that obtaining needed minimum sine table is 120 points; Simultaneously in order to improve program running efficient, made up the consecutive points spacing sheet of 160 words according to eight kinds of compound modes of triad position, adopt look-up table to determine adjacent 2 intervals in sine table.
As shown in Figure 2, the whole realization flow of embodiments of the invention may further comprise the steps: at first, detect the current notice that begins to send the incoming call shows signal, the step 201 whether sent of the switch CPU of making a start; As receive the order of this outer CPU, then terminaling exchange begins to send the incoming call shows signal, carry out the caller identification signalling procedure, the information that CPU writes is handled, contents processing comprises adding 1 before the caller identification signal data high position, add 0 behind the low level, and calculate the caller identification signal data verification and, step 202; Search the current 3 bit data contents that will send, 3 bit data contents find 20 data of corresponding adjacent spaces table, step 203 thus; According to the side-play amount of the corresponding last sampled point of the corresponding data of adjacent spaces table decision current sampling point, look into the frequency numerical value that sine table obtains the current sampling point correspondence, send to pcm bus, step 204; Judging whether 20 current data have sent finishes step 205; Having distributed then as current 20 sampled points, program continues to carry out; Otherwise execution in step 204; Judge current whether total data has all sent finishes, step 206, if full detail has sent then termination routine, otherwise execution in step 203.
As shown in Figure 3, be the actual waveform figure of three bit data " 010 " in the embodiment of the invention.
In the flow process of the foregoing description, described caller identification signal adopts the modulation system of the continuous Binary Frequency Shift Keying of phase place, baud rate is 1200 bps, the sine wave of logical zero employing 2200Hz is represented, logical one adopts the sine wave of 1200Hz to represent, the sample frequency of PCM is 8000Hz, draws 3 bits in the corresponding caller identification signal of per 20 PCM sampled points thus.The present invention adopts look-up table to produce modulating data, in order to save storage space, needs to determine the minimum sampled point of the sine table of looking into, and the sine table sampled point among the present invention is 120 points.Its derivation is as follows:
Be located at when sending logical one (1200Hz), the spacing distance of a current sampling point and a last sampled point is the spacing of A point in the sine table; When sending logical zero (2200Hz), the distance of a current sampling point and a last spaced points is the spacing of B point in the sine table; Be spaced apart C dot spacing between the starting point of a logical one and the end point; Be spaced apart D dot spacing between one logical zero starting point and the end point; The minimum sampling number of sine table is n.Then have
A＝1200n/8000＝3n/20
B＝2200n/8000＝11n/40
C＝A×20/3＝n
D＝B×20/3＝11n/6
Because A, B, C, D all should be integer, so n should be 20,40 and 6 least common multiple, therefore minimum sampling number is 120.
Consider the requirement of caller identification business to the subscriber line circuit load level, 120 sine tables that adopt among the present invention are as follows:
0x0000，0x0622，0x0c40，0x1255，0x185d，0x1e55
0x2437，0x29ff，0x2faa，0x3534，0x3a98，0x3fd3
0x44e2，0x49c0，0x4e6a，0x52dd，0x5716，0x5b12
0x5ecf，0x6248，0x657d，0x686a，0x6b0e，0x6d67
0x6f74，0x7132，0x72a0，0x73bf，0x748c，0x7507
0x7530，0x7507，0x748c，0x73bf，0x72a0，0x7132
0x6f74，0x6d67，0x6b0e，0x686a，0x657d，0x6248
0x5ecf，0x5b12，0x5716，0x52dd，0x4e6a，0x49c0
0x44e2，0x3fd3，0x3a98，0x3534，0x2faa，0x29ff
0x2437，0x1e55，0x185d，0x1255，0x0c40，0x0622
0x0000，0xf9df，0xf3c1，0xedac，0xe7a4，0xe1ac
0xdbca，0xd602，0xd057，0xcacd，0xc569，0xc02e
0xbb1f，0xb641，0xb197，0xad24，0xa8eb，0xa4ef
0xa132，0x9db9，0x9a84，0x9797，0x94f3，0x929a
0x908d，0x8ecf，0x8d61，0x8c42，0x8b75，0x8afa
0x8ad1，0x8afa，0x8b75，0x8c42，0x8d61，0x8ecf
0x908d，0x929a，0x94f3，0x9797，0x9a84，0x9db9
0xa132，0xa4ef，0xa8eb，0xad24，0xb197，0xb641
0xbb1f，0xc02e，0xc569，0xcacd，0xd057，0xd602
0xdbca，0xe1ac，0xe7a4，0xedac，0xf3c1，0xf9df
Because each is made up of 20/3 sampled point, supposes three be combined as " 010 ", then the adjacent distance computation of its 20 sampled point correspondences is as follows:
The adjacent spacing of 0-5 is: B=11 * 120 ÷ 40=33
6 adjacent spacing is: (20/3-6) * and B+ (1-(20/3-6)) * A=28
The adjacent spacing of 7-12 is A=3 * 120 ÷ 20=18
13 adjacent spacing is: (40/3-13) * and A+ (1-(40/3-13)) * B=28
The adjacent spacing of 14-19 is: B=33
Since 3 01 have 8 kinds of compound modes, according to above-mentioned example, the adjacent spacing table that draws its correspondence is as follows:
“000”33，33，33，33，33，33，33，33，33，33，33，33，33，33，33，33，33，33，33，33
“001”33，33，33，33，33，33，33，33，33，33，33，33，33，23，18，18，18，18，18，18
“010”33，33，33，33，33，33，28，18，18，18，18，18，18，28，33，33，33，33，33，33
“011”33，33，33，33，33，33，28，18，18，18，18，18，18，18，18，18，18，18，18，18
“100”18，18，18，18，18，18，23，33，33，33，33，33，33，33，33，33，33，33，33，33
“101”18，18，18，18，18，18，23，33，33，33，33，33，33，23，18，18，18，18，18，18
“110”18，18，18，18，18，18，18，18，18，18，18，18，18，28，33，33，33，33，33，33
“111”18，18，18，18，18，18，18，18，18，18，18，18，18，18，18，18，18，18，18，18
Embodiment described above is illustrative and not restrictive; the content that protection scope of the present invention is put down in writing with claim is as the criterion; any variation of having done under the situation that does not break away from the spirit and scope of the present invention and modification are all within protection scope of the present invention.
Claims (9)
1. caller identification service implementation method, this method may further comprise the steps:
Terminaling exchange sends the incoming call shows signal according to making a start the order of switch outer CPU;
Utilize look-up table that the caller identification signal data is carried out modulation treatment;
Caller identification signal data after called end transmits modulation; And
The called end terminal equipment is finished caller identification business, EP (end of program).
2. caller identification service implementation method as claimed in claim 1 is characterized in that described the caller identification signal data being carried out modulation treatment, comprises adding 1 before the caller identification signal data high position, adds 0 behind the low level, and calculate the caller identification signal data verification and.
3. caller identification service implementation method as claimed in claim 1 is characterized in that the described look-up table that utilizes carries out modulation treatment to the caller identification signal data, comprises following operation:
Search the current 3 bit data contents that will send incoming call shows signal data;
3 bit data contents find 20 data of corresponding adjacent spaces table thus;
Determine the side-play amount of the corresponding last sampled point of current sampling point according to the corresponding data of adjacent spaces table; And
Look into the frequency numerical value that sine table obtains the current sampling point correspondence.
4. caller identification service implementation method as claimed in claim 3 is characterized in that described sine table sampled point is 120 points.
5. caller identification service implementation method as claimed in claim 1, each that it is characterized in that described caller identification signal data is made up of 20/3 sampled point.
6. caller identification service implementation method as claimed in claim 1 is characterized in that described terminaling exchange adopts nextport universal digital signal processor NextPort to carry out the modulation of incoming telephone signal.
7. caller identification service implementation method as claimed in claim 6 is characterized in that the serial line interface PCM of described nextport universal digital signal processor NextPort finishes the output of caller identification signal.
8. caller identification service implementation method as claimed in claim 6 is characterized in that the control interface of described nextport universal digital signal processor NextPort is used to handle code download, the order control and response of outer CPU to dsp chip.
9. caller identification service implementation method as claimed in claim 1 is characterized in that described terminaling exchange adopts single-chip microcomputer or other processor to carry out the modulation of incoming telephone signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031318045A CN100369448C (en) | 2003-06-04 | 2003-06-04 | Incoming telephone displaying service realizing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031318045A CN100369448C (en) | 2003-06-04 | 2003-06-04 | Incoming telephone displaying service realizing method |
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| Publication Number | Publication Date |
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| CN1553679A true CN1553679A (en) | 2004-12-08 |
| CN100369448C CN100369448C (en) | 2008-02-13 |
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| CNB031318045A Expired - Fee Related CN100369448C (en) | 2003-06-04 | 2003-06-04 | Incoming telephone displaying service realizing method |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1217550A (en) * | 1981-10-02 | 1987-02-03 | Jose P. Pintos | Calling line tracing system and identification detector |
| FI97189C (en) * | 1994-11-08 | 1996-10-25 | Nokia Telecommunications Oy | A system for transmitting a calling subscriber's telephone number to a subscriber unit |
| CN1163083C (en) * | 2001-02-28 | 2004-08-18 | 上海贝尔有限公司 | Digital signal and instruction treatment device for program controlled switchboard |
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Effective date of registration: 20180711 Address after: California, USA Patentee after: Global innovation polymerization LLC Address before: Department of law law ZTE building 518057 Shenzhen City, Nanshan District hi tech Industrial Development Zone Patentee before: ZTE Corp. |
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Granted publication date: 20080213 |
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