CN103684574A - Method for testing self-closed loop performance of voice coder decoder of satellite mobile communication terminal - Google Patents
Method for testing self-closed loop performance of voice coder decoder of satellite mobile communication terminal Download PDFInfo
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Abstract
The invention discloses a method for testing self-closed loop performance of a voice coder decoder of a satellite mobile communication terminal. The method comprises the following steps: successively detecting whether the connection of an FPGA with an analog-digital converter and a voice coder decoder is normal, the signaling control of the FPGA on the voice coder decoder is normal, and the self-closed loop performance of the analog-digital converter is normal, and then conducting the testing of the self-closed loop performance of the voice coder decoder: enabling the externally connected input end of the analog-digital converter, and enabling the analog-digital converter to enter a normal operating mode; enabling the externally connected input end of the voice coder decoder, and enabling the voice coder decoder to enter the self-closed loop function operating mode; inputting 2 KHz signals to the input end of the analog-digital converter; checking whether output signals are 2 KHz signals or not, wherein the self-closed loop function of the voice coder decoder is normal when the output signals are 2 KHz signals, and is abnormal when the output signals are not 2 KHz signals. The method ensures that the voice coder decoder achieves the good self-closed loop performance, and provides guarantee for good data transmission performance of the satellite mobile communication terminal.
Description
Technical field
The present invention relates to satellite communication field, particularly a kind of audio coder & decoder (codec) of the satellite mobile communication terminal based on " Big Dipper " is from closed loop performance test methods.
Background technology
The low frequency part of digital radio system adopts digital circuit, compares with conventional wireless electric system, and the A/D of software radio system, D/A conversion has moved on to intermediate frequency, and as far as possible near radio-frequency head.Software radio replaces special digital circuit with the strong FPGA of power able to programme, DSP device, makes system hardware structure and function opposite independent.Field programmable gate array FPGA advanced technology part is that compact footprint can high speed processing, also keeps flexibility and the programmability of software and radio technique simultaneously.From FPGA, can realize reconfigurable core, in FPGA, can realize modulator, demodulator and CODEC function.FPGA develops into signal processing engine from logical design platform flexibly, becomes FET, FIR, the ideal platform of numeral lower multifrequency device DDC, digital up converter DUC, correlator and pulse compression (processing for radar) computing.
AMBE encoding and decoding technique is a kind of low bit rate speech coding technology with high voice quality and strong robustness.AMBE2000 adopts AMBE encoding and decoding technique, is the monolithic real-time voice Compress softwares chip of a kind of high-performance, low-power consumption, has realized data and the voice simultaneous interpretation of low bandwidth, duplex, voice communication naturally, can understand.
As shown in Figure 1, a kind of satellite mobile communication terminal based on " Big Dipper ", comprises fpga chip XC5VLX50T, dsp chip TMS320C6455, audio coder & decoder (codec) chip AMBE2000 and PCM3500; Described fpga chip XC5VLX50T is connected with AMBE2000 by control interface; Described XC5VLX50T is connected with TMS320C6455 by EMIFA interface, HPI interface; XC5VLX50T is connected with PCM3500 by programmable interface.
Should the advantage of the advantage of FPGA and AMBE2000 be combined and be applied in satellite mobile communication terminal the satellite mobile communication terminal based on " Big Dipper ", will for mobile communication, bring the voice quality of high-quality and good real-time.But should the satellite mobile communication terminal based on " Big Dipper " require very high to data transmission performance between XC5VLX50T and AMBE2000, verify in advance whether its functional parameter reaches designing requirement and seem extremely important, for example, verify the self-closing ring function characteristic of AMBE2000.
Summary of the invention
The object of the present invention is to provide a kind of satellite mobile communication terminal based on " Big Dipper " audio coder & decoder (codec) from closed loop performance test methods.
In order to realize foregoing invention object, the invention provides following technical scheme:
The audio coder & decoder (codec) of satellite mobile communication terminal is from a closed loop performance test methods, and described satellite mobile terminal is the satellite mobile communication terminal based on " Big Dipper ", and described audio coder & decoder (codec) is chip AMBE2000, and the method comprising the steps of:
Step a: in detection satellite mobile communication terminal, whether FPGA is normal, concrete with being connected of PCM3500:
A1: the register that PCM3500 inside is set by FPGA;
A2: by the read back register of PCM3500 inside of FPGA, check that whether the register setting of the PCM3500 inside of reading back is consistent with the value of establishing in step a1, if unanimously, FPGA is connected normally with PCM3500, otherwise PCM3500 breaks down;
If connect normally, enter step: b, if PCM3500 breaks down, change PCM3500, again detect being connected of PCM3500 and FPGA, until FPGA is connected with PCM3500 normally, described PCM3500 is the analog to digital converter being connected with AMBE2000;
Step b: in detection satellite mobile communication terminal, whether FPGA is normal, concrete with being connected of AMBE2000:
B1: the register that AMBE2000 inside is set by FPGA;
B2: by the read back register of AMBE2000 inside of FPGA, check that whether the register setting of the AMBE2000 inside of reading back is consistent with the value of establishing in step b1, if unanimously, FPGA is connected normally with AMBE2000, otherwise AMBE2000 breaks down;
If connected normally, enter step c, if AMBE2000 breaks down, change AMBE2000, re-start detection, until FPGA is connected with AMBE2000 normally;
Step c: detect FPGA whether normal, concrete to the signaling control function of AMBE2000:
C1: the register of AMBE2000 inside is set by FPGA, adjusts the structure of its coding;
C2: receive the speech coding of AMBE2000 by FPGA, check that whether the structure of the coding receiving is consistent with the coding structure arranging in step c1, if consistent, it is normal that FPGA controls function to the signaling of AMBE2000, otherwise AMBE2000 breaks down;
If FPGA controls function normally to the signaling of AMBE2000, enter steps d, otherwise change AMBE2000, return to step b;
Steps d: detect the self-closing ring function of PCM3500 whether normal, concrete:
D1: enable the external input of PCM3500, PCM3500 is entered from closed loop mode;
D2: signal generator is to the input input 2KHz signal of PCM3500;
D3: oscilloscope connects the output of PCM3500, check whether the signal showing in oscilloscope is 2KHz signal, and if it is the self-closing ring function of PCM3500 is normal, otherwise PCM3500 breaks down;
If the self-closing ring function of PCM3500 is normally, enter step e, otherwise change PCM3500, again detect FPGA whether normal with being connected of PCM3500, after connection is normal, carry out again the self-closing ring function of PCM3500 and detect;
Step e: carry out the self-closing ring function of AMBE2000 and detect, specifically:
E1: enable the external input of PCM3500, make PCM3500 enter normal mode of operation;
E2: enable the external input of AMBE2000, make AMBE2000 enter self-closing ring function mode of operation;
E3:PCM3500 input is connected with signal generator, the input input 2KHz signal by signal generator to PCM3500;
E4:PCM3500 output is connected with oscilloscope, check whether the signal showing in oscilloscope is 2KHz signal, and if it is the self-closing ring function of AMBE2000 is normal, otherwise the self-closing ring function of AMBE2000 is abnormal.
compared with prior art, beneficial effect of the present invention: the audio coder & decoder (codec) of satellite mobile communication terminal of the present invention is from closed loop performance test methods, whether the audio coder & decoder (codec) that can well test satellite mobile communication terminal is normal from closed-loop characteristic, the audio coder & decoder (codec) of having guaranteed satellite mobile communication terminal has good in closed-loop characteristic, and then provide guarantee for thering is good data transmission performance in satellite mobile communication terminal between FPGA and audio coder & decoder (codec), met the requirement of the satellite mobile communication terminal based on " Big Dipper ".
Accompanying drawing explanation:
Fig. 1 is the satellite mobile communication terminal structure schematic diagram of tested object of the present invention based on " Big Dipper ".
Embodiment
Below in conjunction with test example and embodiment, the present invention is described in further detail.But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology realizing based on content of the present invention all belong to scope of the present invention.
AMBE encoding and decoding speech technology is a kind of low bit rate speech coding technology with high voice quality and strong robustness.This method is pressed each harmonic frequency of fundamental tone in frequency domain, by the spectrum division of frame voice, is a plurality of frequency bands, and each frequency band is done to clear, voiced sound judgement.To voiced sound band, the pulse train that the fundamental tone of usining is the cycle is as pumping signal; To resonance area, using white noise as pumping signal; Total pumping signal is added and is formed by each band pumping signal.With this excitation signal energizes vocal tract filter, finally synthesize the voice with higher naturalness.Therefore the in the situation that of low bit rate, the tonequality of its synthetic speech still can keep higher naturalness.Its improved AMBE algorithm becomes the speech coding standard of IMSO and mobile satellite communication.
Phonetic codec chip AMBE2000 adopts AMBE encoding and decoding technique; it is the monolithic real-time voice Compress softwares chip of a kind of high-performance, low-power consumption; its compression ratio can be by hardware, software adjustment within the scope of 2kbit/s～9.6kbit/s; when speed is when 4.0kbit/s is above, can obtain approaching the speech quality of toll telephone; When speed is 2.0kbit/s, still there is higher intelligibility and naturalness.Phonetic codec chip AMBE2000 has FEC (forward error correction), VAD (voice activation detection) function and dtmf signal measuring ability, realized data and the voice simultaneous interpretation of low bandwidth, duplex, voice communication naturally, can understand.
With reference to figure 1, a kind of satellite mobile communication terminal structure schematic diagram based on " Big Dipper ".Above-mentioned advantage based on phonetic codec chip AMBE2000, this satellite mobile communication terminal based on " Big Dipper " has adopted compress speech, the decompressing function of AMBE2000, realizes the voice communication of high voice quality, high real-time.Should the satellite mobile communication terminal based on " Big Dipper " comprise fpga chip XC5VLX50T, dsp chip TMS320C6455, audio coder & decoder (codec) chip AMBE2000 and analog to digital converter chip PCM3500; Described fpga chip XC5VLX50T is programmed and is provided with the simulation control interface corresponding with AMBE2000 control interface by programmable interface, and the simulation control interface of XC5VLX50T is connected with AMBE2000 control interface; Described XC5VLX50T by programmable interface programme be provided with the simulation EMIFA interface corresponding with dsp chip TMS320C6455 EMIFA interface, with the corresponding simulation HPI interface of TMS320C6455 HPI interface, the simulation EMIFA interface of XC5VLX50T is connected with TMS320C6455 EMIFA interface, and the simulation HPI interface of XC5VLX50T is connected with TMS320C6455HPI interface; XC5VLX50T is programmed speech parameter and the operational mode of PCM3500 chip is set by programmable interface.
Above-mentioned satellite mobile communication terminal XC5VLX50T based on " Big Dipper " and the interface between AMBE2000, through optimal design, have the data flow of the satellite mobile communication terminal meeting based on " Big Dipper " and control the feature requiring.
The audio coder & decoder (codec) of satellite mobile communication terminal of the present invention is from closed loop performance test methods, for to the testing from closed-loop characteristic of the satellite mobile communication terminal AMBE2000 based on " Big Dipper " shown in Fig. 1, comprises step:
Step a: in detection satellite mobile communication terminal, whether FPGA is normal with being connected of PCM3500, and its concrete steps comprise:
A1: the register that PCM3500 inside is set by FPGA;
A2: by the read back register of PCM3500 inside of FPGA, check that whether the register setting of the PCM3500 inside of reading back is consistent with the value of establishing in step a1, if unanimously, FPGA is connected normally with PCM3500, otherwise PCM3500 breaks down.
If connected normally, enter step b, otherwise change PCM3500, re-start detection, until FPGA is connected normally with PCM3500.
Step b: in detection satellite mobile communication terminal, whether FPGA is normal with being connected of AMBE2000, and its concrete steps comprise:
B1: the register that AMBE2000 inside is set by FPGA;
B2: by the read back register of AMBE2000 inside of FPGA, check that whether the register setting of the AMBE2000 inside of reading back is consistent with the value of establishing in step b1, if unanimously, FPGA is connected normally with AMBE2000, otherwise AMBE2000 breaks down.
If connected normally, enter step c, otherwise change AMBE2000, re-start detection, until FPGA is connected with AMBE2000 normally;
Step c: detect FPGA whether normal to the signaling control function of AMBE2000, its step comprises:
C1: the register of AMBE2000 inside is set by FPGA, adjusts the structure of its coding;
C2: receive the speech coding of AMBE2000 by FPGA, check that whether the structure of the coding receiving is consistent with the coding structure arranging in step c1, if consistent, it is normal that FPGA controls function to the signaling of AMBE2000, otherwise AMBE2000 breaks down.
If FPGA controls function normally to the signaling of AMBE2000, enter steps d, otherwise change AMBE2000, return to step b.
Steps d: whether normally detect the self-closing ring function of PCM3500, it comprises step:
D1: enable the external input of PCM3500, PCM3500 is entered from closed loop mode;
D2: signal generator is to the input input 2KHz signal of PCM3500;
D3: oscilloscope connects the output of PCM3500, check whether the signal showing in oscilloscope is 2KHz signal, and if it is PCM3500 function is normal, otherwise PCM3500 breaks down.
If the self-closing ring function of PCM3500 is normally, enter step e, otherwise change PCM3500, and whether again detect FPGA normal with being connected of PCM3500, after connection is normal, carry out again the self-closing ring function of PCM3500 and detect.
Step e: carry out the self-closing ring function of AMBE2000 and detect, specifically:
E1: enable the external input of PCM3500, make PCM3500 enter normal mode of operation;
E2: enable the external input of AMBE2000, make AMBE2000 enter self-closing ring function mode of operation;
E3:PCM3500 input is connected with signal generator, the input input 2KHz signal by signal generator to PCM3500;
E4:PCM3500 output is connected with oscilloscope, check whether the signal showing in oscilloscope is 2KHz signal, and if it is the self-closing ring function of AMBE2000 is normal, otherwise the self-closing ring function of AMBE2000 is abnormal.
The audio coder & decoder (codec) of satellite mobile communication terminal of the present invention has following characteristics from closed loop performance test methods: 1) tested satellite mobile communication terminal fpga chip XC5VLX50T based on " Big Dipper " and the hardware linkage function between audio coder & decoder (codec) chip AMBE2000 and analog to digital converter chip PCM3500; 2) test the signaling of call that fpga chip XC5VLX50T realizes the satellite mobile communication terminal of Digital Speech Communication and controlled function; 3) tested the self-closing ring function of AMBE2000 and PCM3500.Before carrying out the self-closing ring function of AMBE2000, carry out the test of hardware linkage function between FPGA and AMBE2000 and PCM3500, carry out FPGA AMBE2000 signaling is controlled functional test, carried out the self-closing ring function test of PCM3500, effectively guaranteed the accuracy of the self-closing ring function test of AMBE2000.
The audio coder & decoder (codec) of satellite mobile communication terminal of the present invention has well been tested the self-closing ring function of AMBE2000 from closed loop performance test methods, for having good function of voice communication, the Big Dipper mobile communication terminal provides guarantee, met well the requirement of the Big Dipper mobile communication terminal, be in the satellite mobile communication testing system based on " Big Dipper ", to use first, met well in actual use requirement.
Claims (1)
1. the audio coder & decoder (codec) of a satellite mobile communication terminal is from closed loop performance test methods, described satellite mobile terminal is the satellite mobile communication terminal based on " Big Dipper ", described audio coder & decoder (codec) is chip AMBE2000, it is characterized in that, the method comprising the steps of:
Step a: in detection satellite mobile communication terminal, whether FPGA is normal, concrete with being connected of PCM3500:
A1: the register that PCM3500 inside is set by FPGA;
A2: by the read back register of PCM3500 inside of FPGA, check that whether the register setting of the PCM3500 inside of reading back is consistent with the value of establishing in step a1, if unanimously, FPGA is connected normally with PCM3500, otherwise PCM3500 breaks down;
If connected normally, enter step b, if PCM3500 breaks down, change PCM3500, again detect being connected of PCM3500 and FPGA, until FPGA is connected with PCM3500 normally, described PCM3500 is the analog to digital converter being connected with AMBE2000;
Step b: in detection satellite mobile communication terminal, whether FPGA is normal, concrete with being connected of AMBE2000:
B1: the register that AMBE2000 inside is set by FPGA;
B2: by the read back register of AMBE2000 inside of FPGA, check that whether the register setting of the AMBE2000 inside of reading back is consistent with the value of establishing in step b1, if unanimously, FPGA is connected normally with AMBE2000, otherwise AMBE2000 breaks down;
If connected normally, enter step c, if AMBE2000 breaks down, change AMBE2000, re-start detection, until FPGA is connected with AMBE2000 normally;
Step c: detect FPGA whether normal, concrete to the signaling control function of AMBE2000:
C1: the register of AMBE2000 inside is set by FPGA, adjusts the structure of its coding;
C2: receive the speech coding of AMBE2000 by FPGA, check that whether the structure of the coding receiving is consistent with the coding structure arranging in step c1, if consistent, it is normal that FPGA controls function to the signaling of AMBE2000, otherwise AMBE2000 breaks down;
If FPGA controls function normally to the signaling of AMBE2000, enter steps d, otherwise change AMBE2000, return to step b;
Steps d: detect the self-closing ring function of PCM3500 whether normal, concrete:
D1: enable the external input of PCM3500, PCM3500 is entered from closed loop mode;
D2: signal generator is to the input input 2KHz signal of PCM3500;
D3: oscilloscope connects the output of PCM3500, check whether the signal showing in oscilloscope is 2KHz signal, and if it is the self-closing ring function of PCM3500 is normal, otherwise PCM3500 breaks down;
If the self-closing ring function of PCM3500 is normally, enter step e, otherwise change PCM3500, again detect FPGA whether normal with being connected of PCM3500, after connection is normal, carry out again the self-closing ring function of PCM3500 and detect;
Step e: carry out the self-closing ring function of AMBE2000 and detect, specifically:
E1: enable the external input of PCM3500, make PCM3500 enter normal mode of operation;
E2: enable the external input of AMBE2000, make AMBE2000 enter self-closing ring function mode of operation;
E3:PCM3500 input is connected with signal generator, the input input 2KHz signal by signal generator to PCM3500;
E4:PCM3500 output is connected with oscilloscope, check whether the signal showing in oscilloscope is 2KHz signal, and if it is the self-closing ring function of AMBE2000 is normal, otherwise the self-closing ring function of AMBE2000 is abnormal.
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0927988A2 (en) * | 1997-12-04 | 1999-07-07 | Digital Voice Systems, Inc. | Encoding speech |
| CN1498468A (en) * | 2001-03-16 | 2004-05-19 | ��˹��ŵ�� | Testing loops for channel coder-decoder |
| CN1431637A (en) * | 2003-01-24 | 2003-07-23 | 东南大学 | Communication technology teaching experimental facility and method based on micropower wireless transmission |
| US20090287480A1 (en) * | 2008-05-16 | 2009-11-19 | Tellabs Operations, Inc. | Method and apparatus for low bit rate speech coding detection |
| CN201820444U (en) * | 2010-07-28 | 2011-05-04 | 北京航空航天大学 | Multi-channel voice encoding-decoding equipment |
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