14、无损音频编码技术解析：预测与可扩展方法

无损音频编码技术解析：预测与可扩展方法

1. 预测无损音频解码器

预测无损解码器使用无损预测器进行音频重建。以下是相关的Python代码实现：

import numpy as np
import sys
import os
import pickle
import struct
from bitstring import BitStream
from ricecoder import rice

def nlmslosslesspreddec(e,L,h):
    #Computes the NLMS lossless predictor
    #arguments: x: input signal (mono)
    #L: Predictor lenght
    #h: starting values for the L predictor coefficients
    #returns: e, the prediction error
    xrek=np.zeros(len(e))
    for n in range(L, len(e)):
        #prediction error and filter, using the vector of reconstructed samples,
        #predicted value from past reconstructed values, since it is lossless, xrek=x:
        xrekvec=xrek[n-L+np.arange(L)]
        P=np.dot(np.flipud(xrekvec),