PENGOLAHAN SINYAL DIGITAL Modul 5. Sistem Waktu Diskret dan Aplikasi TZ

Content Overview Sistem Waktu Diskrit System Properties (Shift Invariance, Kausalitas, Stabilitas) dikaitkan dengan TZ Transformasi sistem dari persamaan difference ke respon impuls dan sebaliknya Realisasi Sistem dg adder minimal dan delay minimal Mencari Respon Steady State Struktur : kaskade, paralel

Signal Classification Periodic and non-periodic signals Analog and discrete signals A non-periodic signal A periodic signal A discrete signal Analog signals 2005-01-21

Sampling Time domain Frequency domain

modulated (PAM) signal Sampling theorem Sampling theorem: A bandlimited signal with no spectral components beyond , can be uniquely determined by values sampled at uniform intervals of The sampling rate, is called Nyquist rate. Sampling process Analog signal Pulse amplitude modulated (PAM) signal

Aliasing Effect LP filter Nyquist rate aliasing

Modulation, Demodulation and Coding Quantization Amplitude quantizing: Mapping samples of a continuous amplitude waveform to a finite set of amplitudes. In Out Quantized values Average quantization noise power Signal peak power Signal power to average quantization noise power 2004-01-24 Lecture 2

Modulation, Demodulation and Coding Quantization example amplitude x(t) x(nTs): sampled values xq(nTs): quantized values boundaries Quant. levels 111 3.1867 110 2.2762 101 1.3657 100 0.4552 011 -0.4552 010 -1.3657 001 -2.2762 000 -3.1867 Ts: sampling time t PCM codeword 110 110 111 110 100 010 011 100 100 011 PCM sequence 2005-01-26 Lecture 3