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MEDICAL INSTRUMENTATION

MEDICAL INSTRUMENTATION. 우응제 교수님 학습노트 10 2010104012 한택희. Electromagnetic Spectrum. 1. Audio Frequency(20~20,000Hz). 2.Radio Frequency. A. Low Freq : 30kHz(10km)~300kHz(1km) * 참고 : 300KHz 전파하려면 안테나는 500m 는 되어야 한다 . B. Medium Freq : 300KHz(1km)~3MHz(100m)

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MEDICAL INSTRUMENTATION

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  1. MEDICAL INSTRUMENTATION 우응제 교수님 학습노트10 2010104012 한택희

  2. Electromagnetic Spectrum 1. Audio Frequency(20~20,000Hz) 2.Radio Frequency A. Low Freq: 30kHz(10km)~300kHz(1km) *참고: 300KHz 전파하려면 안테나는 500m는 되어야 한다. B. Medium Freq: 300KHz(1km)~3MHz(100m) C. High Freq: 3MHz(100m)~30MHz(10m) D. Very high Freq(VHF): 30MHz(10m)~300MHz (1m) E. Ultra high freq(UHF) 300MHz(1m)~3GHz(0.1m)

  3. Electromagnetic Spectrum 3.Microwave(1GHz 이상) Centimeter wave: 3GHz(10cm)~30GHz(1cm) Millimeter wave: 30GHz(10mm)~300GHz(1mm) Submillimeter wave: 300GHz(1mm)~3THz(0.1mm) 4.Infrared(적외선) A. Far Infrared(원적외선) B. (Intermediate)Infrared(적외선) Plank constant:

  4. Electromagnetic Spectrum 7. X-ray 5.Visible light(가시광선) 수eV, 파장<1μm 빨주노초파남보 6.Ultra violet(자외선) 8. Gamma ray femtometer

  5. 변조(Modulation)와 복조(demodulation) -Baseband signal→f1(t),f2(t)…..fn(t) 음성: 20~20,000Hz ECG: 0.05~100Hz EEG:0.1~30Hz 20 20 20 20,000 20,000 20,000 목소리톤 낮은 음성신호 목소리 톤 높은 음성신호 일반 음성신호

  6. 변조(Modulation)와 복조(demodulation) f1(t)coswc1t . . . . . . . Amp Amp . . . . . . . coswct coswct fN(t)coswcNt f1 -f1 f

  7. 변조(Modulation)와 복조(demodulation) Time domain에서 두 신호의 곱은 Frequency demain에서 두 신호의 convolution과 같다. F(W)와 cos함수의 convolution fc1 변조된 신호(증폭변조 :AM) fc2 fc3 coswc1t f1(t):baseband signal Cf)주파수 변조(FM)

  8. 변조(Modulation)와 복조(demodulation) fi(t)coswct LPF Amp coswct Tuner 20,000Hz fc1 fcn Band pass

  9. 변조(Modulation)와 복조(demodulation) LPF에 의해 없어짐 LPF에 의해 없어짐 LPF에 의해 없어짐 없어지지 않음 따라서 Carrier frequency만 알면 복조가 가능하다.

  10. 변조(Modulation)와 복조(demodulation) Frequency Division Multiplexing(FDM) →같은 공간에 주파수가 다른 여러 개의 전파를 내보내서 여러 신호를 동시에 주고 받는 방식 Time Division Multiplexing(TDM) →연속신호는 안되고 디지털 신호는 가능 1 1 1 0 0 0 0 switch A switch A 주파수 높게 주파수 낮게 C A B B C

  11. 감사합니다

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