komunikasi data -...
TRANSCRIPT
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KOMUNIKASI DATA
Transmisi Sinyal Digital (lanjut)
Oleh:
Fahrudin Mukti Wibowo, S.Kom., M.Eng
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Scrambling
• Tujuan: melakukan subtitusi dg aturan tertentu apabila dideteksi sejumlah level tegangan 0 berderet panjang dg memodifikasi metode AMI
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Scrambling B8ZS
• Bipolar with 8-Zero Substitution
• Jika terdapat 8 level tegangan 0 berurutan level tegangan 000VB0VB
• V: violation level tegangan yg memiliki level tegangan inversi dari level tegangan seharusnya (inversi aturan AMI)
• B: bipolar level tegangan yg mengikuti aturan AMI
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+V
-V
1 0 0 0 0 0 0
A
T
0 0
V BB 00 V0 0
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Scrambling HDB3
• High Density Bipolar 3-Zero
• subtitusi dg level tegangan 000V atau B00V jika menjumpai 4 level tegangan 0 berurutan
• Aturan:
jika jumlah sinyal tidak 0 setelah substitusi terakhir, adalah ganjil maka susbtitusi dilakukan dengan menggunakan level tegangan 000V, jika genap menggunakan level tegangan B00V
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+V
-V
1 0 0 1 0 0 0
A
T
1 1 0 0 1 0 0 0 0 0
0 0 0 V B 0 V0 B 0 0 V
Substitusi 1 Substitusi 2 Substitusi 3
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Konversi Data Analog ke Sinyal Digital
• Pulse Code Modulation (PCM)
• Delta Modulation
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Components of PCM encoder
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Components of a PCM decoder
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Pulse Code Modulation• sampling proses mencacah sinyal analog
menjadi potongan-potongan sinyal dg amplitudo sesuai dg sinyal asli
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Proses Sampling
• Dengan mencacah sinyal analog dalam periode waktu tertentu (periode sampling =Ts) atau frekuensi tertentu/sampling rate (frekuensi sampling= fs)
• Semakin tinggi fs (semakin kecil Ts) maka sisnyal hasil sampling akan semakin menyerupai sinyal analog asli
• Sinyal hasil sampling disebut Pulse Amplitude Modulation (PAM)
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Three different sampling methods for PCM
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Teorema Nyquist
• Frekuensi sampling harus minimal 2x frekuensi tertinggi yang ada di sinyal analog
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Kuantisasi
• kuantisasi proses pembulatan amplitudo sinyal terkuantisasi ke bilangan integer terdekat
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Quantizer
PROSES KUANTISASI (QUANTIZATION)
Kuantisasi : mengubah level amplituda menjadi diskret dengan
jumlah terbatas.
t t
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Quantization and encoding of a sampled signal
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Pengkodean
• Melakukan pengkodean digital terhadap hasil kuantisasi
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Encoding
0
-V
V
t
000
001
010
011
100
101
110
111
1 1 1 1 1 0 1 0 0 0 1 1 0 1 0 1 0 0 1 0 1 1 1
t
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Delta Modulation
• Mendeteksi perubahan amplitudo antara cacahan saat ini dengan cacahan sebelumnya
• Apabila bernilai positif DM akan membangkitkan bit 1, jika bernilai negatif DM akan membangkitkan bit 0
• Maka keluaran DM merupakan deretan bit yg menggambarkan perubahan amplitudo dari sinyal analog
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The process of delta modulation
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Delta modulation components
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Delta demodulation components
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THANK YOU