CN102098393A - Test device and method for voice splitter - Google Patents
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Abstract
The invention discloses a test device and a test method for a voice splitter. The device comprises an interface module, a central processing unit (CPU) and one or more test modules, wherein the interface module is used for transmitting a test command and receiving a test index transmitted by the CPU in response to user operation; the CPU is used for receiving the test command from the interface module, transmitting a control command to one or more test modules and transmitting the test index to the interface module; the one or more test modules are used for receiving the control command from the CPU, performing transmitting and receiving operation corresponding to the control command and comparing a test signal transmitted to the voice splitter and a test signal fed back by the voice splitter so as to obtain test indexes of one or more voice splitters. According to the technical scheme provided by the invention, the problems of high price of an instrument for testing parameters of the voice splitter, long test time and the like in a related technology are solved, and the parameters of the voice splitter can be quickly and conveniently tested on a large scale.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of Splitter testing apparatus and method.
Background technology
Splitter, be called for short separator (Splitter), (xDSL is various Digital Subscriber Line (Digital Subscriber Line to be applied to xDSL, abbreviate DSL as) general designation, be to be the transmission technology of transmission medium with the black phone copper cash, wherein x represents different types of DSL technology, comprises ADSL, ADSL2+, VDSL2 etc.) broadband connections in.Usually said Splitter is meant the xDSL separator, promptly based on the Splitter (being xDSL over POTS Splitter) of conllinear transmission broadband digital signal on the traditional voice telephone line.
The application scenarios schematic diagram of Splitter specifically can be referring to Fig. 1.Splitter with the low-frequency audio signal on the circuit (300～3400Hz) with the transmission data high-frequency digital modulation signal (20KHz～30MHz) effectively separate, then audio signal is sent into public branch exchange network (Public Switched Telephone Network, abbreviate PSTN as) or POTS (Plain Old Telephone Service, abbreviate POTS as) the telephone set facsimile machine etc., the high-frequency digital modulation signal is sent into DSLAM (DSL Access Multiplexer)/DSL MODEM modulator-demodulator.The corresponding high-frequency digital modulation signal of DSL port (frequency range: 20KHz～30MHz); Corresponding low-frequency audio signal (the frequency range: 300～3400Hz) of POTS port; The corresponding high frequency low frequency mix of user (USER) port (frequency range: 300～30MHz).Because the DSL access network need effectively separate traditional low frequency voice signal and high frequency dsl data signal, just must use separator.
At present, Splitter all is the multi-stage filter circuit that is made of the passive device of inductance, electric capacity and resistance, and its leading indicator has POTS to insert loss, POTS reflection loss, group delay, longitudinal balance, frequency band isolation, DSL frequency band insertion loss etc.
The low-pass filtering of insertion loss reflection Splitter and high-pass filtering be the signal attenuation degree in passband separately respectively, has determined separator to the influence degree by signal, and loss is more little then more little by signal attenuation.Reflection loss reflects the matching degree of each port docking port impedance of separator, and the good more reflection loss of matching degree is more little, and the overwhelming majority of source signal just is passed to load.Group delay is meant because the time-delay that the voice signal that the LC filter circuit of separator causes transmitting produces.It is the smaller the better to delay time, and longitudinal balance is meant that separator can influence the integrality of signal transmission because the asymmetry on Tip and the Ring circuit causes separator that differential signal is produced certain influence.Longitudinal balance degree is the bigger the better.
It is particularly important that the test of Splitter parameter seems, expensive testers such as conventional employing PSM139, and the testing time is longer, and for example, testing a Splitter needs 10 minutes at least.
Summary of the invention
At the instrument of test separator parameter in correlation technique problems such as relatively costliness and testing time be long, the invention provides a kind of Splitter testing apparatus and method, one of to address the above problem at least.
A kind of testing apparatus of Splitter is provided according to an aspect of the present invention.
Testing apparatus according to Splitter of the present invention comprises: interface module is used to respond the user and operates the transmission test instruction, and receives the test index that central processing unit (Central Processing Unit abbreviates CPU as) transmits; CPU is used to receive the test instruction that comes from interface module, to one or more test module sending controling instructions, and to interface module transmission test index; One or more test modules, be used to receive the control command that comes from CPU, carry out the transmission corresponding and receive operation with control command, the test signal of test signal that will send to Splitter and Splitter feedback is compared, to obtain the test index of one or more Splitters.
A kind of method of testing of Splitter is provided according to a further aspect in the invention.
Method of testing according to Splitter of the present invention is applied to testing apparatus, and this testing apparatus comprises: interface module, CPU and one or more test module, and said method comprises: interface module response user operational order sends test instruction to CPU; CPU is after receiving test instruction, to one or more test module sending controling instructions; One or more test modules are carried out the transmission corresponding with control command and are received operation; The test signal of test signal that one or more test modules will send to Splitter and Splitter feedback is compared, to obtain the test index of one or more Splitters.
By the present invention, the test module in the testing apparatus receives the control command that comes from CPU in the testing apparatus, carries out the transmission corresponding with this control command and receives operation, finishes the test of a plurality of separators simultaneously.The instrument that has solved tested speech separator parameter in correlation technique problems such as relatively costliness and testing time be long, and then can be quick, convenient and tested speech separator parameter in large quantity.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the application scenarios schematic diagram according to the Splitter of correlation technique;
Fig. 2 is the structured flowchart according to the testing apparatus of the Splitter of the embodiment of the invention;
Fig. 3 is the structural representation of the testing apparatus of Splitter according to the preferred embodiment of the invention;
Fig. 4 is the circuit theory diagrams that the testing apparatus of the employing Splitter of example according to the present invention carries out the return loss parameter testing;
Fig. 5 is the circuit theory diagrams that the testing apparatus of the employing Splitter of example according to the present invention carries out the longitudinal balance parameter testing;
Fig. 6 inserts the circuit theory diagrams of loss parameter, group delay parameter and voice metering pulse parameter testing for the testing apparatus of the employing Splitter of example according to the present invention;
Fig. 7 is the flow chart according to the method for testing of the Splitter of the embodiment of the invention;
Fig. 8 is the flow chart of the method for testing of Splitter according to the preferred embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Fig. 2 is the structured flowchart according to the testing apparatus of the Splitter of the embodiment of the invention.As shown in Figure 2, the testing apparatus of this Splitter comprises: interface module 22, CPU 24 and one or more test module 26.
Interface module 22 is used to respond the user and operates the transmission test instruction, and receives the test index that central processing unit CPU transmits;
CPU 24, are used to receive the test instruction that comes from interface module, to one or more test module sending controling instructions, and to interface module transmission test index;
One or more test modules 26, be used to receive the control command that comes from CPU, carry out the transmission corresponding with control command and receive operation, the test signal that test signal that will send to Splitter and Splitter feed back is compared, to obtain the test index of Splitter.
In the testing apparatus of above-mentioned Splitter, test module receives the control command that comes from CPU in the testing apparatus, carries out the transmission corresponding with this control command and receives operation, finishes the test of a plurality of Splitters simultaneously.The instrument that has solved tested speech separator parameter in correlation technique problems such as relatively costliness and testing time be long, and then can be quick, convenient and tested speech separator parameter in large quantity.
Preferably, each in above-mentioned one or more test module 26 includes:
Digital processing circuit (DSP), be used for after receiving control command, sending audio frequency and high-frequency digital test signal, digital test signal to feedback carries out fast fourier transform FFT calculation process, and the digital test signal that sends and the digital test signal of feedback compared, to obtain the test index of Splitter;
Analog-to-digital conversion circuit (AFE) is connected with DSP, is used to realize the conversion between digital test signal and the analog test signal;
One or more analog signal processing circuits (LD), be connected with AFE, be used for sending one or more analog test signal, and receive one or more digital test signal that comes from the Splitter feedback to Splitter, wherein, LD is corresponding one by one with Splitter.
Preferably, above-mentioned interface module 20 can include but not limited to: visualized graphs interface (GUI) also is used to show test index.
Preferably, above-mentioned CPU 24 is used for by serial ports or network interface acceptance test instruction, sending controling instruction and transmission test index.
The preferred implementation of above-mentioned testing apparatus is described below in conjunction with Fig. 3.
Fig. 3 is the structural representation of the testing apparatus of Splitter according to the preferred embodiment of the invention.As shown in Figure 3, the testing apparatus of this Splitter comprises: visualized graphs interface (GUI) 32 (being equivalent to above-mentioned GUI), CPU (CPU) 34 (being equivalent to above-mentioned CPU 24) and a test module 36 (being equivalent to above-mentioned test module 26); Wherein, CPU 34 may further include: processor, flash chip and Ethernet chip, this test module 36 comprises: DSP 360, AFE 362, LD 364.
Visualized graphs interface (GUI) 32 is mainly generated by computer, application program with network interface communication function.
DSP 360, can be made up of DSL special digital chip.Can send the DMT orthogonal demodulation signal to AFE, and can carry out the FFT calculation process the digital signal that AFE sends.DSP analyzes the contrast received signal and sends signal.Can calculate every index of Splitter.
AFE 362, can be made up of the special-purpose analog-digital chip of DSL.
It should be noted that a test module has been shown among Fig. 3, in actual applications, a plurality of test modules can be set in above-mentioned testing apparatus as the case may be.
Below in conjunction with Fig. 4 to Fig. 6 the method for testing of Splitter leading indicator, the test philosophy of the Splitter parameter that makes introductions all round below and testing procedure (note: following test philosophy and step are example with ADSL over POTS separator) are described respectively.
Example one, Splitter return loss parameter testing;
As shown in Figure 4, R1=R2=600 ohm, ZT1=ZT2.The transtation mission circuit that TX is made up of DSP, AFE, LD; RX is the receiving circuit that is made of the LD on mutually same road, AFE, DSP.ZT is the load that separator connects, and is generally 600 ohm.The acoustic characteristic impedance of separator POTS port/user port is ZT, and its reflection loss should satisfy:
300Hz～500Hz：＞14+2(f-3)dB
500Hz～2000Hz：＞18dB
2000Hz～3400Hz：＞18-0.28(f-20)dB
Testing procedure is as follows: disconnect tested interface, by RX circuit test inverse signal level P0; Connect tested interface, by RX circuit test inverse signal level P1.
Test result: the acoustic characteristic impedance of separator interface POTS port/user port is P0-P1.
Example two, the parameter testing of Splitter longitudinal balance;
As shown in Figure 5,50Hz＜f＜4kHz, R1=R2=300 ohm; 4kHz＜f＜4.4MHz, the transtation mission circuit that R1=R2=50 ohm .TX is made up of DSP, AFE, LD; RX is the receiving circuit that is made of the LD on mutually same road, AFE, DSP.R=300 ohm, 50Hz＜f＜4khz; R=50 ohm, 4kHz＜f＜4..4Mhz.The unbalanced to ground of separator POTS port/user port should be satisfied:
50Hz～600Hz：＞40dB
600Hz～3400Hz：＞46dB
3400Hz～30kHz：＞40dB
30kHz～1104kHz：＞45dB
1104kHz～4.4MHz：＞30dB
Testing procedure:
(1) switch S 1 closure, the TX transmission frequency is 200Hz-4KHz, the TX transmission level is the test signal of P0, by RX circuit test inverse signal level P1;
(2) switch S 1 is opened, and the TX transmission frequency is 4KHz-5MHz, and the TX transmission level is the test signal of P0, by RX circuit test inverse signal level P1;
Test result: the longitudinal balance of separator interface POTS port/user port is P0-P1.
Example three, Splitter inserts the loss parameter and surveys;
As shown in Figure 6, the transtation mission circuit formed by DSP, AFE, LD of TX; RX is by other one tunnel LD, AFE, the receiving circuit that DSP constitutes.The insertion loss of separator voiced band should be satisfied: when the audio frequency impedance was 600 ohm, the insertion loss at 1020Hz that separator produces should be not more than 0.3dB; When the audio frequency impedance was three element, the insertion loss at 1020Hz that separator produces should be not more than 1dB;
Testing procedure: do not insert separator, TX sends frequency, and to be 1020Hz, level be that the signal of-10dBm, RX receive the level signal P0 that comes out by user port; Insert separator, TX sends frequency, and to be 1020Hz, level be that the signal of-10dBm, RX receive the level signal P1 that comes out by user port;
Test result: it is P0-P1 that the voiced band of separator interface POTS port/user port inserts loss.
Example four, the parameter testing of Splitter group delay;
As shown in Figure 6, Splitter group delay parameter testing schematic diagram.The transtation mission circuit that TX is made up of DSP, AFE, LD; RX is by other one tunnel LD, AFE, the receiving circuit that DSP constitutes.The separator group delay should satisfy: the group delay of the signal in the 500-2800Hz frequency range can not surpass 150us.
Testing procedure: do not insert separator, TX sends frequency, and to be 500～2800Hz, level be that the signal of-10dBm, RX receive the group delay G0 that comes out by user port; Insert separator, TX sends frequency, and to be 500～2800Hz, level be that the signal of-10dBm, RX receive the group delay G1 that comes out by user port;
Test result: separator interface group delay is G0-G1.
Example five, Splitter voice metering pulse parameter testing;
As shown in Figure 6, the transtation mission circuit formed by DSP, AFE, LD of TX; RX is by other one tunnel LD, AFE, the receiving circuit that DSP constitutes.The metering pulse of separator voice should be satisfied: under 12kHz or 16kHz pulse, the insertion loss of separator must be in 3～5dBm.
Testing procedure: do not insert separator, it is that 12kHz or 16kHz pulse, level are the signal of 3.53Vrms that TX sends frequency, and RX receives the level signal P0 that comes out by user port; Insert separator, it is that 12kHz or 16kHz pulse, level are the signal of 3.53Vrms that TX sends frequency, and RX receives the level signal P1 that comes out by user port.
Test result: the voice metering pulse loss of separator interface POTS port/user port is P0-P1.
Fig. 7 is the flow chart according to the method for testing of the Splitter of the embodiment of the invention.Wherein, above-mentioned testing apparatus comprises: interface module, central processing unit CPU and one or more test module, and as shown in Figure 7, the method for testing of this Splitter mainly comprises following processing:
Step S702: interface module response user operational order sends test instruction to CPU;
Step S704:CPU is after receiving test instruction, to one or more test module sending controling instructions;
Step S706: one or more test modules are carried out the transmission corresponding with control command and are received operation;
Step S708: the test signal of test signal that one or more test modules will send to Splitter and Splitter feedback is compared, to obtain the test index of one or more Splitters.
In the method for testing of above-mentioned Splitter, test module receives the control command that comes from CPU in the testing apparatus, carries out the transmission corresponding with this control command and receives operation, has finished the test of a plurality of Splitters simultaneously.The instrument that has solved tested speech separator parameter in correlation technique problems such as relatively costliness and testing time be long, and then can be quick, convenient and tested speech separator parameter in large quantity.
Preferably, in one or more test modules each includes: digital processing circuit (DSP), analog-to-digital conversion circuit (AFE) and one or more analog signal processing circuit (LD), then among the above-mentioned steps S706, one or more test modules are carried out the transmit operation corresponding with control command and be may further include following processing:
(1) DSP sends audio frequency and high-frequency digital test signal after receiving control command;
(2) AFE is converted to analog test signal with the digital test signal that receives and sends;
(3) one or more LD receive and come from one or more analog test signal of AFE, and are sent to Splitter, and wherein, LD is corresponding one by one with Splitter.
Preferably, in one or more test modules each includes: digital processing circuit (DSP), analog-to-digital conversion circuit (AFE) and one or more analog signal processing circuit (LD), then among the above-mentioned steps S706, one or more test modules are carried out the reception operation corresponding with control command and be may further include following processing:
(1) one or more LD receive one or more analog test signal that comes from the Splitter feedback, and are sent to AFE, and wherein, LD is corresponding one by one with Splitter;
(2) AFE is converted to digital test signal and feedback with the analog test signal that receives;
(3) DSP receives the digital test signal that comes from the AFE feedback, and this digital test signal is carried out fast fourier transform FFT calculation process.
Preferably, above-mentioned interface module can include but not limited to: the visualized graphs interface after step S708, can also comprise following processing:
(1) one or more test modules are sent to CPU with test index;
(2) CPU is sent to the visualized graphs interface by network interface with test index, to show.
Below in conjunction with Fig. 8 above-mentioned preferred implementation is described.
Fig. 8 is the flow chart of the method for testing of Splitter according to the preferred embodiment of the invention.As shown in Figure 8, the method for testing of this Splitter mainly comprises following processing:
Step S802 sends the test instruction stage at GUI, and the application program that is provided with is on computers sent the Splitter test instruction to CPU.
Step S804, the test module that is made of DSP, AFE and LD sends audio frequency and high frequency band orthogonal demodulation signal stage, sends audio frequency and high frequency band orthogonal demodulation signal, gives tested Splitter.
Step S806, the test circuit that is made of LD, AFE and DSP carries out the FFT calculation process stage to received signal, receives the signal that reflects by separator or separator and is converted to frequency-region signal by the FFT computing.
Step S808, the DSP comparative analysis sends the difference of signal and received signal, calculates the separator index stage, and according to the definition of each parameter of separator, contrast sends and received signal, calculates the occurrence of each parameter.
Step S810, GUI shows test results the stage, the parameter index of Splitter, DSP sends to CPU by the host interface, and CPU sends to gui interface by the network interface chip and shows.
In sum, by the foregoing description provided by the invention, leading indicator that can test separator, for example, POTS inserts that loss, POTS reflection loss, group delay, longitudinal balance, frequency band are isolated, the DSL frequency band inserts loss etc.In specific implementation process, only need need not change hardware by the software interface setting, just can realize; Support that also a plurality of separators are tested simultaneously, the separator different parameters is tested and the test of various criterion separator.A kind of Splitter method of testing has very strong autgmentability, as long as revise software parameter, just can be applied in the test of transformer type product.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the testing apparatus of a Splitter is characterized in that, comprising:
Interface module is used to respond the user and operates the transmission test instruction, and receives the test index that central processing unit CPU transmits;
Described CPU is used to receive the described test instruction that comes from described interface module, to one or more test module sending controling instructions, and transmits described test index to described interface module;
Described one or more test module, be used to receive the control command that comes from described CPU, carry out the transmission corresponding and receive operation with described control command, the test signal of test signal that will send to Splitter and described Splitter feedback is compared, to obtain the described test index of one or more described Splitters.
2. device according to claim 1 is characterized in that, each in described one or more test modules includes:
Digital processing circuit DSP, be used for after receiving described control command, sending audio frequency and high-frequency digital test signal, digital test signal to described feedback carries out fast fourier transform FFT calculation process, and the digital test signal of described transmission and the digital test signal of described feedback compared, to obtain the described test index of described Splitter;
Analog-to-digital conversion circuit AFE is connected with described DSP, is used to realize the conversion between digital test signal and the analog test signal;
One or more analog signal processing circuit LD, be connected with described AFE, be used for sending one or more analog test signal to described Splitter, and reception comes from one or more digital test signal of described Splitter feedback, wherein, described LD is corresponding one by one with described Splitter.
3. device according to claim 1 is characterized in that, described interface module comprises: the visualized graphs interface also is used to show described test index.
4. device according to claim 1 is characterized in that, described CPU is used for receiving described test instruction, send described control command and transmitting described test index by serial ports or network interface.
5. according to each described device in the claim 2 to 4, it is characterized in that described DSP comprises: DSL special digital process chip.
6. according to each described device in the claim 2 to 4, it is characterized in that described AFE comprises: the special-purpose analog-digital chip of DSL.
7. according to each described device in the claim 2 to 4, it is characterized in that described LD comprises: the DSL specialized simulation amplifies chip.
8. the method for testing of a Splitter is applied to testing apparatus, it is characterized in that, described testing apparatus comprises: interface module, central processing unit CPU and one or more test module, and described method comprises:
Described interface module response user operational order sends test instruction to described CPU;
Described CPU is after receiving described test instruction, to one or more test module sending controling instructions;
Described one or more test module is carried out the transmission corresponding with described control command and is received operation;
The test signal of test signal that described one or more test module will send to Splitter and described Splitter feedback is compared, to obtain the described test index of one or more described Splitters.
9. method according to claim 8, it is characterized in that, in described one or more test module each includes: digital processing circuit DSP, analog-to-digital conversion circuit AFE and one or more analog signal processing circuit LD, then described one or more test modules carry out the transmit operation corresponding with described control command and comprise:
Described DSP sends audio frequency and high-frequency digital test signal after receiving described control command;
Described AFE is converted to analog test signal with the digital test signal that receives and sends;
Described one or more LD receives and comes from one or more described analog test signal of described AFE, and is sent to described Splitter, and wherein, described LD is corresponding one by one with described Splitter.
10. method according to claim 8, it is characterized in that, in described one or more test module each includes: digital processing circuit DSP, analog-to-digital conversion circuit AFE and one or more analog signal processing circuit LD, then described one or more test modules carry out the reception operation corresponding with described control command and comprise:
Described one or more LD receives one or more analog test signal that comes from described Splitter feedback, and is sent to described AFE, and wherein, described LD is corresponding one by one with described Splitter;
Described AFE is converted to digital test signal and feedback with the analog test signal that receives;
Described DSP receives the digital test signal that comes from described AFE feedback, and this digital test signal is carried out fast fourier transform FFT calculation process.
11. to 10 each described methods, it is characterized in that described interface module comprises according to Claim 8: the visualized graphs interface after described one or more test modules obtain the described test index of described Splitter, also comprises:
Described one or more test module is sent to described CPU with described test index;
Described CPU is sent to described visualized graphs interface by network interface with described test index, to show.
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| CN103200337A (en) * | 2013-03-25 | 2013-07-10 | 东南大学 | X digital subscriber line (xDSL) speech splitter test analytic system and detection method thereof |
| CN115954020A (en) * | 2022-12-09 | 2023-04-11 | 深圳康佳电子科技有限公司 | Test method, test device and storage medium for offline voice module |
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| 梁向飞: "xDSL及分离器接口指标测试以及测试设计", 《中国优秀博硕士学位论文全文数据库（硕士）信息科技辑》, 15 June 2007 (2007-06-15) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200337A (en) * | 2013-03-25 | 2013-07-10 | 东南大学 | X digital subscriber line (xDSL) speech splitter test analytic system and detection method thereof |
| CN103200337B (en) * | 2013-03-25 | 2015-03-11 | 东南大学 | X digital subscriber line (xDSL) speech splitter test analytic system and detection method thereof |
| CN115954020A (en) * | 2022-12-09 | 2023-04-11 | 深圳康佳电子科技有限公司 | Test method, test device and storage medium for offline voice module |
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