公开(公告)号：US06370507B1

公开(公告)日：2002-04-09

申请号：US09319066

申请日：1999-05-28

申请人： Bernhard Grill ,  Bernd Edler ,  Karlheinz Brandenburg

发明人： Bernhard Grill ,  Bernd Edler ,  Karlheinz Brandenburg

IPC分类号： G10L1902

CPC分类号： G10L19/24 ,  G10L19/0204

摘要： In a method of coding discrete time signals (X1) sampled with a first sampling rate, second time signals (x2) are generated using the first time signals having a bandwidth corresponding to a second sampling rate, with the second sampling rate being lower than the first sampling rate. The second time signals are coded in accordance with a first coding algorithm. The coded second signals (X2c) are decoded again in order to obtain coded/decoded second time signals (X2cd) having a bandwidth corresponding to the second sampling frequency. The first time signals, by frequency domain transformation, become first spectral values (X1). Second spectral values (X2cd) are generated from the coded/decoded second time signals, the second spectral values being a representation of the coded/decoded time signals in the frequency domain. To obtain weighted spectral values, the first spectral values are weighted by means of the second spectral values, with the first and second spectral values having the same frequency and time resolution. The weighted spectral values (Xb) are coded in accordance with a second coding algorithm in consideration of a psychoacoustic model and written into a bit stream. Weighting the first spectral values and the second spectral values comprises the subtraction of the second spectral values from the first spectral values in to obtain differential spectral values.

摘要翻译： 在对以第一采样率采样的离散时间信号（X1）进行编码的方法中，使用具有对应于第二采样率的带宽的第一时间信号来生成第二时间信号（x2），其中第二采样率低于 第一次采样率。 第二时间信号根据第一编码算法进行编码。 再次对编码的第二信号（X2c）进行解码，以获得具有对应于第二采样频率的带宽的编码/解码的第二时间信号（X2cd）。 第一次通过频域变换的信号变为第一个光谱值（X1）。 从编码/解码的第二时间信号产生第二频谱值（X2cd），第二频谱值是频域中编码/解码的时间信号的表示。 为了获得加权光谱值，通过第二光谱值对第一光谱值进行加权，其中第一和第二光谱值具有相同的频率和时间分辨率。 考虑到心理声学模型并将其写入比特流，加权频谱值（Xb）根据第二编码算法进行编码。 加权第一光谱值和第二光谱值包括从第一光谱值减去第二光谱值以获得差分光谱值。