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ST75C540 数据表(PDF) 77 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 77 Page - STMicroelectronics |
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77 / 84 page ![]() XV - DEFAULT CALL PROGRESS TONE DETECTORS 0 -10 -20 -30 -40 -50 0 200 400 600 800 1000 dB no detection detection step = 10Hz reference level = 0dB f (Hz) Figure 44 : Call Progress Tone Detector Band 1 0 -10 -20 -30 -40 -50 2000 2040 2080 2120 2160 2200 f (Hz) no detection detection dB reference level = 0dB step = 10Hz Figure 46 : 2100Hz Answer Tone Detector 0 -10 -20 -30 -40 -50 200 320 440 560 680 800 f (Hz) no detection detection dB step = 10Hz reference level = 0dB Figure 47 : 440Hz Tone Detector 0 -8 -16 -24 -32 -40 0 720 1440 2160 2880 3600 f (Hz) no detection detection dB step = 100Hz reference level = 0dB Figure 45 : Call Progress Tone Detector Band 2 XVI - DEFAULT ANSWER TONE DETECTORS ST75C530 - ST75C540 77/84 |
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