MUHAMMAD AL-XORAZMIY NOMIDAGI TOSHKENT
AXBOROT TEXNOLOGIYALARI UNIVERSITETI
Amaliy ish
Topshirdi:
___-21guruh talabasi
Urmanov Muxtorxo‘ja
Qabul qildi: _________________
Toshkent 2024
21
y=cos(6π/x)+2sin(x3/π)
8
x ∈ (0; πN/8), ∆𝒙 = 𝟎. 𝟏𝟏
import numpy as np
import matplotlib.pyplot as plt
def signalni_kvantlash (signal, levels):
# Signalning minimal va maksimal qiymatini topish
min_signal = min(signal)
max_signal = max(signal)
# Kvantlash qadamini hisoblash
qadam_ulchami = (max_signal - min_signal) / kvantlash_darajasi
# Kvantlashni amalga oshirish
kvantlangan_signal = []
for i in signal:
# Eng yaqin kvantlash darajasini topish
kvantlangan_qiymat = min_signal + round((i - min_signal) /
qadam_ulchami) * qadam_ulchami
kvantlangan_signal.append(kvantlangan_qiymat)
return kvantlangan_signal
# Signal hosil qilish
N = 21
x = np.arange(0, np.pi*N/8, 0.11)
analog_signal = np.cos(6*np.pi/x) + 2*np.sin(3*x/np.pi)
kvantlash_darajasi = 6
kvantlangan_signal = signalni_kvantlash (analog_signal, kvantlash_darajasi)
# Natijani chiqarish
plt.figure(figsize=(15, 10))
plt.subplot(2, 2, 1)
plt.plot(analog_signal, color = "red")
plt.title("Analog signal")
plt.xlabel('Vaqt')
plt.ylabel('Signal qiymati')
plt.grid(True)
plt.subplot(2, 2, 2)
plt.stem(analog_signal, 'y', markerfmt='.')
plt.title("Diskret signal")
plt.xlabel('Vaqt')
plt.ylabel('Signal qiymati')
plt.grid(True)
plt.subplot(2, 2, 3)
plt.plot(kvantlangan_signal, color = "blue", linestyle='--', marker='x')
plt.title("Kvantlangan signal")
plt.xlabel('Vaqt')
plt.ylabel('Signal qiymati')
plt.grid(True)
plt.subplot(2, 2, 4)
plt.step(x, analog_signal + 1, label='pre (default)')
plt.plot(x, analog_signal + 1, 'C0o', alpha=0.5)
plt.title("Kodlangan signal")
plt.xlabel('Vaqt')
plt.ylabel('Signal qiymati')
plt.grid(True)
plt.show()