測試項目:
1>發送頻率響應:Sending frequency response (SFR);
2>發送響度:Sending loudness rating (SLR);
3>接收頻率響應:Receiving frequency response (RFR);
4>接收響度:Receiving loudness rating (RLR);
5>側音掩蔽評定值:Side tone masking rating (STMR);
6>聽筒側音值:Listener side tone rating (LSTR);
7>電話聲耦合損耗:Telephone acoustic coupling loss (TAL);
8>回聲損耗:Echo loss (EL);
9>穩定度余量:Stability margin;
10>發送失真:Sending distortion;
11>接收失真:Receiving distortion;
12>側音失真:Sidetone distortion;
13>空閒信道噪聲(發送/接收):Idle channel noise: Sending/Receiving;
14>環境噪聲抑制:Ambient noise rejection.
其中第1,2,3,4,5,10項是CTTL要求測試的。
1>發送頻率響應:Sending frequency response (SFR);
2>發送響度:Sending loudness rating (SLR);
3>接收頻率響應:Receiving frequency response (RFR);
4>接收響度:Receiving loudness rating (RLR);
5>側音掩蔽評定值:Side tone masking rating (STMR);
6>聽筒側音值:Listener side tone rating (LSTR);
7>電話聲耦合損耗:Telephone acoustic coupling loss (TAL);
8>回聲損耗:Echo loss (EL);
9>穩定度余量:Stability margin;
10>發送失真:Sending distortion;
11>接收失真:Receiving distortion;
12>側音失真:Sidetone distortion;
13>空閒信道噪聲(發送/接收):Idle channel noise: Sending/Receiving;
14>環境噪聲抑制:Ambient noise rejection.
其中第1,2,3,4,5,10項是CTTL要求測試的。
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