Digital-to-analog Converter: incazelo, izimiso yokusebenza, isicelo.

amasignali Analog zinezikhathi eziningi nemingcele lobuchwepheshe, enye yazo imvamisa oscillation. Ngokwesibonelo, indlebe yomuntu ongezwa amasignali kokuba imvamisa in the uhla kusuka 1 kuya 22 kHz, futhi ukukhanya ebonakalayo yakhiwa imvamisa ulinganiswa izigidigidi hertz. Isibonelo isignali Analogue zingakhiqiza ukuqopha irekhodi gramophone. Ama ifotho, omnyama nomhlophe ekuqaleni, bese, nombala - kubuye yisibonelo analog isignali ukurekhoda.

Digital-to-analog Converter cishe njalo kunesidingo ngemva analog-to-digital Converter (ADC), okuyinto ulusizo ukusho amazwi ambalwa, ukuthi kube nenkinga kucace ukuthi isixazululekile yidivayisi olucutshungulwayo yithi.

ADC oguqula isiginali ye-analog kuya yedijithali. Ngokuvamile inani okuhambelana ukubaluleka isignali ngesikhathi zokulinganisa, kukhona ikhodi kanambambili. nesilinganiso ngamunye owazenza imvamisa elibizwa ngokuthi izinga izibonelo zalokho.

ubuncane amasampuli kulinganisela kwakuthiwa kugomela enikeza undistorted isignali yokutakula. Lokhu isignali ayinakho ukuhlanekezela futhi ubuyisele ekhishwa sedijithali analog isignali Converter. quantizing imvamisa kufanele kube imvamisa okungenani ezimbili esiphezulu iguqulwe isignali. Ngokwesibonelo, i-tingucuko undistorted isignali umsindo imvamisa ngokwanele quantization elilingana 44 kHz.

Manje-ke kuyacaca ukuthi digital-kuya-analog Converter isezingeni ukulandelana input amakhodi kanambambili, okuyinto kufanele iguqulwe ibe isiginali ye-analog okuhambisanayo.

nokwethenjelwa Operational and ukuphila inkonzo zifakwe izibalo, kodwa lezi nemingcele akuncikile isimiso yokusebenza ye-DAC, kodwa kunalokho kusuka izingxenye nokwakha izinga. Kungakhathaliseki ukuguqulwa isimiso DAC zihlukaniswa izici ezifana uhla ashukumisayo, ngokunemba ukuguqulwa nesikhathi nemingcele.

Ububanzi ashukumisayo kunqunywa for the-DAC input bese okukhipha, njengoba isilinganiso seqiwe uvo (okuphumayo) okokufaka ubuncane (okuphumayo) Inani.

Omunye nemingcele isikhathi iyona ephambene we izibonelo zalokho imvamisa, inkathi ebizwa ngokuthi quantization. Kuyaqondakala ukuthi lesi silinganiso icacisa ADC, nge lapho isignali iguqulelwe DAC.

Inani eliyisisekelo esibonisa isivinini DAC yisikhathi ukuguqulwa. Lapha kufanele ukhethe phakathi okwandisa ukuguqulwa - DAC esinembile, kodwa engaphansi kwezigidi ijubane layo uma igijima, futhi okuphambene nalokho.

Cabangela izimiso zokuguqula "digital-kuya-analog", ngaphandle kokunikeza amafomula izikimu. Zimbili isimiso ukuguqulwa - serial ngokulinganisa.

Kulandzelana kwalokucuketfwe lokuhleliwe amakhodi digital ngaso uvo digital-kuya-analog Converter Uphendula ukulandelana pulses unxande ngesikhathi okukhiphayo. A ububanzi ishayela futhi isikhawu okulandelayo ngaphambi ishayela elilandelayo kunqunywa kuye ikhodi engenayo kanambambili. Ngakho, okukhipha ongaphakeme-pass esihlungini wasitholela isiginali ye-analog ngu pulses ukufika ku okufakwayo nge isikhathi variable.

ukuguqulwa Parallel wenziwa, isibonelo, nge resistors ixhumeke parallel esitebeleni ugesi. Isibalo resistors ilingana okokufaka kancane ukuze ikhodi input. Inani ukumelana in idijithi eziphawuleka kakhulu incane izikhathi 2 ngaphambi kwalokho LSB. Ngo yesifunda ukumelana onesihluthulelo. Ikhodi Finyelela elawula ukhiye - lapho 1, notshwala zamanje. Ngenxa yalokho, ngo-circuit zamanje izonqunywa isisindo uze uphele du, digital-kuya-analog Converter okukhipha has a wamanje net okuzokwenza zivumelana binary code eqoshiwe.