Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: GSM yakashandisa marudzi akasiyana-siyana ezvinyorwa zvemazwi kudzvinyirira 3.1 kHz audio pakati pe7 ne13 kbit/s. Pakutanga, ma codec maviri, akatumidzwa mazita emhando dzenzira yedata dzavakagoverwa, akashandiswa, anonzi Half Rate (6.5 kbit / s) uye Full Rate (13 kbit / s). Idzi dzakashandisa gadziriro yakavakirwa pakukodha kwokufanotaura kwakananga (LPC). Kuwedzera pakuva vanobudirira pamwe bitrates, codecs izvi akaitawo nyore kuziva zvikamu zvikuru inokosha ekuteerera, kubvumira mhepo inowanikwa rukoko kukoshesa uye nani kudzivirira zvikamu izvi chiratidzo. GSM yakavandudzwazve muna 1997 ne enhanced full rate (EFR) codec, 12.2 kbit/s codec inoshandisa full-rate channel. Pakupedzisira, pamwe kukura UMTS, EFR akanga refactored kupinda shanduka-mwero codec akadana AMR-Narrowband, inova yepamusoro uye akasimba pamusoro pokukanganisa kana kushandiswa zvizere-mwero migero, kana zvishoma akasimba asi vachiri nokure yakakwirira unhu kana kushandiswa zvakanaka redhiyo mamiriro hafu-mwero mugero.  Mubvunzo: GSM inoshandisa makibiti mangani?
pakati pe7 ne13