Introduction to Communication

RadioLai Lap Kwan Swena 20129856

1873

•Никола Тесла discover that radio is similar as basic electronic communication

•Basic foundation of transfer the message through radio

1888

•Hertz (German) prove the existence of electromagnetic wave

•1967 Hertz become the name of frequency wave

1906

•Leicester (American) prove the vacuum tube can bring high frequency wave for radio

•1910 Leicester become the father of broadcasting

History

Digital Audio Broadcasting (DAB) Amplitude Modulation (AM) Frequency Modulation (FM) Secret Radio

Introduction

Another name : EUREKA 147 1980 DAB published to the public 2006 About 100 countries use Digital Audio

Broadcasting (DAB) to broadcast to the public

Digital Audio Broadcasting (DAB)

Advantages Disadvantages

Fidelity of sound Quality of sound < FM

Broadcast > 1 channel at the same time

Bit of the sound

Solve the problem of noisy

Baseband + Carrier Wave = Broadband 1980 Carrier Wave : 530 – 1700 kHz 1990 Carrier Wave : 1620 – 1700 kHz

Amplitude Modulation (AM)

Advantages Disadvantages

Easy to explore Fidelity of sound

Radar Echo is strong AM < FM

No need to use power source

1935 Edwin Armstrong publish FM Include stereophonic Similar as W-FM

Frequency Modulation (FM)

Advantages Disadvantages

Interference ability is strong

Frequency of sound is drift

simple signal amplitude fading phenomena

Easy to disturb by other frequency channel

Fidelity of sound Selectivity

Secret RadioCountries Nature

Taiwan • Centralize in the middle & Southern of Taiwan• Call-in service is provided

Hong Kong • Have to approve by Television and Entertainment Licensing Authority (TELA)• Online broadcast service also provided

China • Forbid any radio channel, so secret radio is common• Secret Radio focus on medical treatment programme

Radio Television Hong Kong (RTHK)

Metro Broadcasting Corporation Limited

Commercial Radio Hong Kong

MyRadio.com.hk

Common Radio in Hong Kong

The 1st broadcasting company in Hong Kong Managed by Commerce and Economic 

Development Bureau (CEDB) Unique public broadcasting company in

Hong Kong

Radio Television Hong Kong

Radio 1(Cantonese)

Radio 2 (Cantonese)

Radio 3(English)

Radio 4 (Classical

Music)

Radio 5 (Chinese Music)

Radio 6 (BBC News)

Putonghua Radio Teen Power

Business Broadcasting Company Main purpose : Entertainment

Metro Broadcasting Corporation Limited

MetroInfo(Cantonese)

Metro Finance (Cantonese)

AM1044 Metro Plus (English)

Metro Finance Digital (Online)

Metro Music Digital

(Online)

881 Special is under Commercial Radio Hong Kong

Business Broadcasting Company

Commercial Radio Hong Kong

Home 881 (Commercial

Radio 1)

Home903 (Commercial

Radio 2)

AM864 (English)

Hong Kong Toolbar (Online)

Online Radio Channel Operation style : unique online radio Cooperation with Hong Kong People

Reporter before

MyRadio

http://zh.wikipedia.org/zh-hk/%E9%9B%BB%E5%8F%B0

http://zh.wikipedia.org/wiki/%E9%A6%99%E6%B8%AF%E5%BB%A3%E6%92%AD%E9%9B%BB%E5%8F%B0%E5%88%97%E8%A1%A8

http://zh.wikipedia.org/wiki/Radio_Hong_Kong

http://www.metroradio.com.hk/# http://myradio.com.hk/ http://www.881903.com/Page/ZH-TW/index.

aspx

Reference