CTA 音频测试绝佳资料（MTK）ACQUA Acoustic Test presentation MTK WCP_H/W Seven_Yang PDF created with pdfFactory trial version www.pdffactory.com Outline： 1、Spec. Intro. 2、Hardware environment (CMD55) 3、Software environment (ACQUA+META) 4、Test items (CTTL) 5、Attention items PDF created with pdfFactory trial version www.pdffactory.com 1、Spec. Intro. Test Items: The red items are CTTL test items Sending frequency response (SFR) Sending loudness rating (SLR) Receiving frequency response (RFR) Receiving loudness rating (RLR) Side tones: Side tone masking rating (STMR) Listener side tone rating (LSTR) Telephone acoustic coupling loss (TAL): Echo loss (EL) Stability margin Sending distortion Receiving distortion Sidetone distortion Idle channel noise: Sending Receiving Ambient noise rejection CTTL: China Telecommunica……