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    Digital FM redio transmitter kazi nadharia

    Digital FM redio transmitter kazi nadharia

        Digital FM transmitter na jadi kanuni Analog FM transmitter kazi kimsingi ni tofauti. Kuweka tu, Analog FM transmitter VCO + PLL simulation teknolojia, na digital FM transmitter na DSP + DDS, programu ya redio teknolojia ya digital. Digital FM redio transmitter kuzuia mchoro ni kama ifuatavyo:

     



     

     

    Jinsi inavyofanya kazi:
        
    Takwimu zinaweza kuonekana katika digital FM transmitter redio kitengo ishara ya pembejeo, digital signal kitengo cha usindikaji, digital FM modulering na bendi ya kupita kuchuja kitengo, utulivu zoom nguvu na chini kupita filter kitengo, mtu-mashine interface kudhibiti na mawasiliano kitengo na umeme mzunguko kitengo sita msimu vipande.
        
    audio ishara ya pembejeo kitengo ni wajibu kwa ajili ya kupokea Analog ishara ya pembejeo audio na digital audio ishara (AES / EBU) pembejeo, Analog ishara redio katika digital audio Analog na digital kubadilisha fedha (D /) katika DSP, ishara ya digital moja kwa moja kwenye DSP aliamua kuchagua ni aina gani ya ishara kama ishara ya pembejeo audio na DSP.
        
    Digital signal usindikaji kitengo ni modules muhimu ya kitengo actuator, msingi wake ni juu ya utendaji 550MHz digital signal processor (DSP), DSP programu ya udhibiti wa pembejeo audio digital marekebisho ishara ya kupata faida, digital kuchuja, digital kabla ya kuongezeka, majaribio ya digital kutokea, Stereo Stereo digital encoded Composite ishara kanuni mkondo, mkondo huu na kompyuta modulering FM na mkondo baseband actuator, hivyo kutengeneza digital signal FM mkondo, mkondo alitumwa moja kwa moja digital frequency synthesizer (DDS), malezi ya FM ishara ya redio katika 1000MHz.
        
    Digital FM modulering na bendi ya kupita filter kitengo, vipengele msingi wa synthesizer moja kwa moja digital frequency (DDS), inayopata pato DSP ya ishara ya digital FM mkondo kuunda digital FM radio frequency ishara kupitia synthesizer ndani ya moja kwa moja mzunguko, kujengwa katika idadi Analog kubadilisha fedha (D /), malezi ya Analog signal FM modulated wimbi, safi FM RF signal baada chujio bendi ya kupita.
        
    Nguvu utulivu kupanua maoni na chini kupita filter kitengo pamoja kudhibiti kufungwa-kitanzi (AGC) FM radio frequency nguvu amplifier na chini kupita filter mzunguko. Kuhakikisha kwamba nguvu ya pato katika operesheni ya muda mrefu imara ya kuweka nguvu.
        
    mtu-mashine interface kudhibiti na kitengo cha mawasiliano kwa kutumia juu ya utendaji mfumo Chip microprocessor (Soc) ili kukamilisha interface mtu-mashine ya actuator, na kukimbia data kununua, ulinzi kengele, mawasiliano ya nje na kazi nyingine. aina ya amri kutoka pembejeo keyboard hali, transmitter kufanya kazi na LCD kubwa-screen na viashiria katika kuonyesha hali halisi wakati. Kubadilishana data na kompyuta kijijini kupitia kiwango interface RS-232 Serial mawasiliano (au interfaces), ili kufikia utendaji wa telemetry kijijini.
        
    Nguvu mzunguko wa kutoa DC umeme kitengo kwa ajili ya kitengo cha moduli actuator.

     

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