HT9020B(2003) Просмотр технического описания (PDF) - Holtek Semiconductor

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производитель

HT9020B
(Rev.:2003)

Call Progress Tone Detector

Holtek Semiconductor 

HT9020B

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.

Level

0dB m

R e je c te d B a n d

-2 7 d B m

C P T In -b a n d D e te c te d

R e je c te d B a n d

-5 0 d B m

200H z

305H z

640H z

800H z

Call progress tone frequency band illustration

. re q u e n c y

U.S.A. Call Progress Tone Signal Format

Tone

Frequency

Precision Dial Tone

350Hz+440Hz

Old Dial Tone

120Hz (or 133Hz, ..) +600Hz

Precision Busy Tone

480Hz+620Hz

Old Busy Tone

120Hz+600Hz

Precision Reorder Tone

480Hz+620Hz

Old Reorder Tone

120Hz+600Hz

Precision Ring-back Tone

Old Ring-back Tone

440Hz+480Hz

40Hz (or the others) +420Hz

Condition

Continuous high

Continuous high

0.5sec high and 0.5sec low

0.5sec high and 0.5sec low

0.3sec high and 0.2sec low

0.2sec high and 0.3sec low or

0.25sec high and 0.25sec low

2sec high and 4sec low

2sec high and 4sec low

Timing Diagram

EN

tR D

tB

tD D

tQ I

S IN

tD H

tD L

ENV

tS T

X 1,X 2

Rev. 1.20

4

March 31, 2003

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