DSP实现的16路全双工来电号码分析系统

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"这篇文章是2004年发表在四川大学学报自然科学版上的一篇论文，主题涉及基于数字信号处理器(DSP)的16路全双工来电号码分析与实现。作者CAIKui、ZHOUShu-hong、ZHOUQun-biao和GOUDa-ju详细阐述了V.23协议下的来电显示(Caller ID, CID)系统的设计与应用。" 在通信领域，来电显示功能已经成为公众和私人生活中不可或缺的一部分。本文主要探讨的是16通道全双工CID系统，即在同一时间能够处理16条线路的来电号码分析，并且可以进行双向通信。这一技术基于频移键控(Frequency Shift Keying, FSK)调制解调技术，FSK是一种常用的模拟信号来传输数字信息的方法，常用于数据通信和电话系统。 FSK调制是通过改变载波频率来表示二进制数据。在美国标准信息交换码(ASCII)编码形式下，来电号码被转化为FSK调制的摩尔斯电码进行传输。在CID系统中，这个显示消息在电话线路上以FSK调制的音频信号传送。论文的重点在于DSP的软硬件设计，DSP（Digital Signal Processor）是一种专门用于处理数字信号的微处理器，它的高速处理能力和灵活性使得它成为实现复杂信号处理任务的理想选择，如FSK解调。作者们详细描述了如何利用DSP进行FSK算法设计，以及如何构建CID系统的硬件和软件架构，确保了系统的高效运行。此外，文章还深入讨论了CID系统在实际应用中如何提高抗干扰性和检测精度。在电话线路中，由于各种噪声和干扰的存在，保证CID信息的准确接收是一项挑战。作者提出了一系列预防措施和高精度检测技术，以确保即使在有干扰的环境中也能正确解析和显示来电号码。最后，作者们确认了所开发的CID系统已经成功开发并且投入使用，证明了其在实际环境中的有效性和可靠性。这篇论文对于理解FSK调制技术在来电显示系统中的应用，以及如何利用DSP优化这类系统的性能提供了宝贵的理论和技术参考。

2004

年

月

第

卷第

期

四川大学学报(自然科学版)

loumal

of Sichuan University CNatural

ience Edition)

Art

icle

ID:

0490-6756(2004

)01-0087-05

16-Channel Full Duplex Caller ID Realization with DSP

CAI

Kui

ZHOU

Shu-hong ,

ZHOU

Qun-biao ,

GOU

-ju

Feb. 2004

l. 41

No.1

(Co

llege

mputer Science, Sichuan University, Chengdu 610064, China)

Abstract:

lling ID(

CID)

detection

widely required in both public and private life.

The

au-

thors introduces

the

analysis of 16-channel full duplex CID information,

the

algorithm design of

FSK

, and

the

realization of CID system based

DSP.

The

authors also discusses

the

prevention

the

interference immunity of CID system and

the

techniques of high precision detection.

The

CID system has been dev

oped successfully and

∞

into

凹

ice.

Key words:

CID;

FSK;

DSP

CLC

number:TN919.2

ucumentωde:A

1 Introduction

The

CID information is transmitted on

the

subscriber

∞

using frequency shift keyed

(FSK)

modem

tones. These

FSK

modem tones are used

transmit

the

display message in

erican standard code for Infor-

mation Interchange

(ASCII)

character

∞

form.

The

transmission of

the

display

mes

田

takes place be-

tween

the

first and

∞

ring.

The

information sent in

udes

the

date, time, and calling number.

The

name

白

ciated

with

the

calling number is sometimes in

uded also. Since

the

time CID was first rnade available it

has been expanded

offer

CID

ll Waiting

(CIDCW)

臼

well.

With

CIDCW

the

call waiting tone is

heard and

the

identification of

the

second call is seen.

The

CID

information is sent

the destination subscriber

∞

between

the

first and second ring by means

of two modem tones.

The

information is transmitted serially in

FSK

mode using one

the

tones

repr

臼

ent

logic 1

(mark)

and

the

other to represent logic 0

(space).

CID

臼

the

same frequencies

(1200bps

in China) ,

modulation type, and data format as

the

ll type 202 moderns.

The

message consists of a channel seizure string followed by a mark string and

then

the

caller informa-

tion.

The

information is sent in one of two formats.

The

Single Data Message Format

(SDMF

Chengdu

出

well)

∞

ntains

date, time, and calling numbe

The

Iultiple Data Message

Format

(MDMF

, such as Bei-

jing) contains

the

date, time, calling number, and

the

name associated with

that

numbe

tionally,

the

number and name fields rnay contain data indicating

that

the

information has been blocked by

the

caller

unavailable.

il\

introduce how

realize a product with 16-channel full duplex CID functions based

DSP.

2 Principles

The

CID information is

sent

asynchronously between

the

first and second ring

a signallevel of - 13. 5

dbm. Following a minimum of 500ms after

the

end of

the

first ring,

the

sequence of transmission begins

with

a channel seizure.

The

channel seizure

a string of

300

∞

ntinuous

bits

(250

ms)

of altemating "O"s and

"1"

This

string

starts

with

"0"

and ends

with

"1".

mark

signal of 180 mark bits

(150

ms) is sent imme-

diately following

the

channel seizure signal.

Received

date:

2003-10-29

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