I-MSI/55 - isiphetho esidala soku-oda izimpahla ngegatsha esitolo esimaphakathi

Idivayisi eboniswe ku-KDPV yayihloselwe ukuthumela ama-oda ngokuzenzakalelayo ukusuka egatsheni kuya esitolo esikhulu. Ukuze wenze lokhu, kwakudingeka ukuthi uqale ufake izinombolo ze-athikili zezimpahla ezi-odiwe, ushayele inombolo yesitolo esimaphakathi bese uthumela idatha usebenzisa isimiso semodemu ehlanganiswe ngokuzwakalayo. Isivinini lapho itheminali ithumela khona idatha kufanele ibe ngama-baud angama-300. Inikwa amandla amaseli amane e-mercury-zinc (ngaleso sikhathi kwakungenzeka), i-voltage yento enjalo ingu-1,35 V, futhi lonke ibhethri liyi-5,4 V, ngakho konke kwasebenza kusukela ku-5 V. Iswishi ikuvumela ukuthi ukhethe izindlela ezintathu: i-CALC - isibali esijwayelekile, i-OPER - ungafaka izinombolo nezinye izinhlamvu, kanye nokuthi THUMELA - ukuthumela, kodwa ekuqaleni awukwazanga ukwenza umsindo. Kuyacaca ukuthi ngandlela-thile ungazigcina izihloko bese uzithumela, kodwa kanjani? Uma singathola, umbhali uzozama ukuhlaziya imisindo lolu hlelo, noma ngandlela thize ulungise itheminali kuzinhlobo zokuxhumana zedijithali zokuxhumana kwabafundi abasafufusa.

Idivayisi kusukela ohlangothini olungemuva, ikhanda eliguqukayo nekhompathimenti yebhethri iyabonakala:

Into ebaluleke kakhulu - indlela yokukhama umsindo ngaphandle kwe-terminal - umbhali wafunda kumuntu owake waba nesiphetho esifanayo. Udinga ukufaka ikhodi yokuqalisa, bese ungafaka izindatshana. Sihambisa iswishi endaweni ye-OPER, kuzovela uhlamvu P. Faka u-0406091001 (umbhali akachazi ukuthi kuyini lokhu, mhlawumbe igama lomsebenzisi) bese ucindezela u-ENT. Kuvela uhlamvu H. Faka u-001290 (futhi lena cishe igama eliyimfihlo) bese ucindezela u-ENT futhi. Kuvela inombolo engu-0. Ungafaka izindatshana.

Isihloko kufanele siqale ngohlamvu H noma P (umbhali wenze iphutha lapha, akukho uhlamvu P ekhibhodi, kukhona u-F), bese kuba nezinombolo. Ngemva kokucindezela ukhiye we-ENT, umugqa onjengo-0004 0451 uvela, lapho ngesihloko ngasinye esilandelayo inombolo yokuqala iyanda futhi eyesibili iyancipha, okusho ukuthi leli yinani lamaseli ahlala futhi akhululekile, ngokulandelana. Ungasebenzisa izinkinobho zemicibisholo ukuze uskrole kuma-athikili afakiwe, kodwa umbhali akazi ukuthi azisusa kanjani (okusho ukuthi ukhiye we-CLR awuzange usize). Akushiwo ukuthi kufanele kuboniswe kanjani inani lesihloko ngasinye.

Ngemva kokufaka ama-athikili, kufanele uhambise iswishi endaweni ethi THUMELA bese ucindezela inkinobho ethi SND/=. Umlayezo othi THUMELA BUSY uzovezwa kusibonisi, futhi ukuhanjiswa kuzoqala:

Ithoni enefrikhwensi engu-4,4 Hz imisindo engu-1200 s. Bese kuba amanye amasekhondi angu-6 - 1000 Hz. Ama-2,8 alandelayo asetshenziswa kudluliswa isiginali eshintshiwe, kulandele amanye ama-3 - futhi kudluliswa ithoni ye-1000 Hz.

Uma ubhekisisa i-spectrum, empeleni, esikhundleni se-1000 Hz uthola i-980, futhi esikhundleni sika-1200 - 1180. Umbhali urekhode ifayela le-WAV, wafaka uhlelo olubalwe ngenhla ("indoda" yalo. lapha) futhi wayiqhuba kanje:

i-minimodem -r -f msi55_bell103_3.wav -M 980 -S 1180 300

Kwenzeke:

### CARRIER 300 @ 1000.0 Hz ###
�H00��90+�H00��90+�H00��90+�H��3�56��+�Ʊ�3�56��+��9��+�ƴ56+�H963�5���+�
### NOCARRIER ndata=74 confidence=2.026 ampl=0.147 bps=294.55 (1.8% slow) ###

Kubukeka sengathi Bell 103 modulation. Nakuba ngokuvamile kukhona i-1070 kanye ne-1270 Hz.

Ingabe amafrikhwensi esitheminali “antante”? Umbhali uhlele ifayela le-WAV ukuze isivinini senyuke ngo-1,8%. Kuvele cishe ku-1000 kanye no-1200. Ukwethulwa okusha kohlelo:

minimodem -r -f msi55_bell103_4.wav -M 1000 -S 1200 300 -R 8000 -8 -startbits 1 -stopbits 1

Futhi waphendula:

### CARRIER 300 @ 1000.0 Hz ###
�H00��90+�H00��90+�H00��90+�H��3�56��+�Ʊ�3�56��+��9��+�ƴ56+�H963�5���+�
### NOCARRIER ndata=74 confidence=2.090 ampl=0.148 bps=299.50 (0.2% slow) ###

Kuzo zombili izimo, umphumela unencazelo, naphezu kwamaphutha. I-athikili H12345678 “ikhishwe” kusiginali ethi H��3�56�� - izinombolo esikwazile ukuzenza zisezindaweni zazo. Ukunikezwa kwamandla kungase kube nokuhlunga okungalungile, okubangela ukuthi ingemuva elingu-50-Hz libekwe phezulu kusignali. Uhlelo lubika inani eliphansi lokuzethemba (i-confidence=2.090), elibonisa isignali ehlanekezelwe. Kodwa manje sekucacile ukuthi i-terminal ithumele kanjani idatha kukhompyutha yesitolo esimaphakathi ngenkathi isekhona.

Source: www.habr.com