TCN 68-212: 2002

Tài liệu tham khảo Tiêu chuẩn ngành bưu chính, viễn thông và công nghệ thông tin về Thiết bị đầu cuối số băng thoại (300 - 3400 Hz) sử dụng tổ hợp cầm tay nối với mạng số liên kết đa dịch vụ (ISDN) – Yêu cầu điện thanh
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TCN 68-212:2002 tcn 68 - 212: 2002 thiÕt bÞ ®Çu cuèi sè b¨ng tho¹i (300 ¸ 3400 Hz) sö dông tæ hîp cÇm tay nèi víi m¹ng sè liªn kÕt ®a dÞch vô (ISDN) Yªu cÇu ®iÖn thanhTelephone band (300 ¸ 3400 Hz) digital handset terminal equipment connecting toIntegrated Services Digital Network (ISDN) Electro-acoustic requirementsTCN 68 - 212: 2002 Môc lôcLêi nãi ®Çu ......................................................................................................................4 1. Ph¹m vi ¸p dông ................................................................................................5 2. Tµi liÖu tham chiÕu chuÈn .................................................................................5 3. §Þnh nghÜa vµ ch÷ viÕt t¾t..................................................................................7 3.1 §Þnh nghÜa.................................................................................................7 3.2 Ch÷ viÕt t¾t ................................................................................................7 4. C¸c chØ tiªu ®Æc tÝnh tho¹i .................................................................................8 4.1 §é nh¹y.....................................................................................................8 4.2 HÖ sè ©m lîng ph¸t vµ hÖ sè ©m lîng thu (SLR vµ RLR) ..........................................................10 4.3 Tr¾c ©m ...................................................................................................10 4.4 Suy hao ghÐp thiÕt bÞ cã träng sè (TCLw)................................................11 4.5 TÝnh æn ®Þnh ............................................................................................11 4.6 MÐo.........................................................................................................11 4.7 C¸c tÝn hiÖu ngoµi b¨ng ...........................................................................14 4.8 C¸c ®Æc tÝnh t¹p ©m thu vµ ph¸t ...............................................................15 4.9 TrÔ...........................................................................................................15 4.10 BiÕn thiªn hÖ sè khuÕch ®¹i theo møc vµo............................................15 Phô lôc A (Quy ®Þnh): Ph¬ng ph¸p ®o ................................................................. A.1 Giíi thiÖu................................................................................................17 A.2 C¸c ph¬ng ph¸p ®o kiÓm TE sè.............................................................17 A.3 §Þnh nghÜa ®iÓm chuÈn 0 dBr .................................................................18 A.4 §Þnh nghÜa c¸c giao diÖn ........................................................................18 A.5 ChØ tiªu kü thuËt cña bé m· ho¸/gi¶i m· .................................................19 A.6 C¸c yªu cÇu ®èi víi thiÕt bÞ ®o ................................................................20 A.7 C¸c phÐp ®o kiÓm ®Æc tÝnh truyÒn dÉn.....................................................21 Phô lôc B (Quy ®Þnh): Ph¬ng ph¸p tÝnh ............................................................. B.1 §é nh¹y ..................................................................................................34 B.2 HÖ sè ©m lîng ph¸t vµ hÖ sè ©m lîng thu (SLR vµ RLR).........................................................34 B.3 Tr¾c ©m...................................................................................................36 B.4 Suy hao ghÐp thiÕt bÞ cã träng sè (TCLw)................................................37 Phô lôc C (Tham kh¶o): Danh môc c¸c ®iÒu kho¶n tham chiÕu .......................382 TCN 68 - 212: 2002 contentsForeword .......................................................................................................................40 1. Scope.................................................................................................................41 2. Normative references .......................................................................................41 3. Definitions and abbreviations..........................................................................43 3.1 Definitions...............................................................................................43 3.2 Abbreviations ..........................................................................................43 4. Speech performance characteristics ...............................................................44 4.1 Sensitivity/frequency response.................................................................44 4.2 Sending and Receiving Loudness Ratings (SLR and RLR) ......................46 4.3 Sidetone...................................................................................................47 4.4 Weighted Terminal Coupling Loss (TCLw) .............................................47 4.5 Stability ...................................................................................................47 4.6 Distortion ............................................................................................. ...