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Medical Instrumentation #10. Electro-magnetic Spectrum, Modulation&Demodulation. 제출일 : 2014. 06. 03. 생체의공학과 2010103789 박 준 환. 1 ) Audio Frequency. 1. Electro-magnetic Spectrum. * 20 ~ 20,000 Hz ( 초음파 : 20,000Hz 보다 크다 ). 2) Radio Frequency. (1) Low Freq : 30kHz(10km) ~ 300kHz(1km)

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medical instrumentation 10

Medical Instrumentation #10

Electro-magnetic Spectrum, Modulation&Demodulation

제출일 : 2014. 06. 03.

생체의공학과

2010103789 박 준 환

1 electro magnetic spectrum

1) Audio Frequency

1. Electro-magnetic Spectrum

* 20 ~ 20,000 Hz (초음파 : 20,000Hz 보다 크다)

2) Radio Frequency

(1) Low Freq : 30kHz(10km) ~ 300kHz(1km)

(2) Medium Freq : 300kHz(1km) ~ 3MHz(100m)

(3) High Freq : 3MHz(100m) ~ 30MHz(10m)

(4) Very High Freq : 30MHz(10m) ~ 300MHz(1m) [VHF]

(5) Ultra High Freq : 300MHz(1m) ~ 1GHz(0.1m) [UHF]

* (3), (4) : Radio에 사용

* (4), (5) : TV 에 사용

1 electro magnetic spectrum1

3) Microwave(1GHz 이상)

1. Electro-magnetic Spectrum

(1) Centimeter Wave : 3GHz(10cm) ~ 30GHz(1cm)

(2) Milimeter Wave : 30GHz(1cm) ~ 300GHz(0.1cm)

(3) Submilimeter Wave : 300GHz ~ 3THz(0.1mm)

* Wave 수 / Cm =

4) Infrared(적외선)

(1) Far Infrared :

(2)(Intermediate) Infrared :

1 electro magnetic spectrum2

1. Electro-magnetic Spectrum

5) Visible Light

* 빨(적,R) 주 노 초 파 남 보(자,V) 로갈수록 감소, v&E증가

6) UltraViolet

7) X-ray

8) Gamma ray

2 modulation demodulation

1) Baseband Signal

2. Modulation & Demodulation

예) 음성 : 20 ~ 20,000Hz, ECG : 0.5 ~ 100Hz, EEG : 0.1 ~ 30Hz

* 3개의 음성 signal

Amp

X

2 modulation demodulation1

2) Fourier transform

2. Modulation & Demodulation

Modulation

20kHz

20kHz

20kHz

Amplitude Modulation(AM)

2 modulation demodulation3

3) Frequency Division Multiplexing(FDM)

2. Modulation & Demodulation

* : 내가 고를 주파수

Filtering

Filtering

Filtering

: 진폭이 절반인 고를 주파수만 남아 있음

Frequency Division Multiplexing(FDM)

2 modulation demodulation4

4) Time Division Multiplexing(TDM) : Digital 에서 가능

2. Modulation & Demodulation

Switch

Switch

. . . .

0 1 1 0 0 1 1 0

Digital

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