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HT9020B Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT9020B Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
4 / 7 page Functional Description The HT9020B call progress tone detector can be used in world wide countries. Below is an illustration of a call progress tone frequency band, and a table of U.S.A. CPT signal is shown for user reference. Usually, HT9020B must work to- gether with a microcontroller through software to distinguish correct cadence of CPT to fit any country CPT SPEC re- quirement for world wide application purposes. U.S.A. Call Progress Tone Signal Format Tone Frequency Condition Precision Dial Tone 350Hz+440Hz Continuous high Old Dial Tone 120Hz (or 133Hz, ..) +600Hz Continuous high Precision Busy Tone 480Hz+620Hz 0.5sec high and 0.5sec low Old Busy Tone 120Hz+600Hz 0.5sec high and 0.5sec low Precision Reorder Tone 480Hz+620Hz 0.3sec high and 0.2sec low Old Reorder Tone 120Hz+600Hz 0.2sec high and 0.3sec low or 0.25sec high and 0.25sec low Precision Ring-back Tone 440Hz+480Hz 2sec high and 4sec low Old Ring-back Tone 40Hz (or the others) +420Hz 2sec high and 4sec low Timing Diagram HT9020B Rev. 1.20 4 March 31, 2003 2 0 0 H z 3 0 5 H z 6 4 0 H z 8 0 0 H z . r e q u e n c y - 5 0 d B m R e j e c t e d B a n d C P T I n - b a n d D e t e c t e d R e j e c t e d B a n d L e v e l 0 d B m - 2 7 d B m Call progress tone frequency band illustration S I N E N V X 1 , X 2 t R D t B t D D t Q I t D H t D L t S T E N |
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Similar Description - HT9020B |
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