公开(公告)号：US20040073421A1

公开(公告)日：2004-04-15

申请号：US10622019

申请日：2003-07-17

Applicant: STMicroelectronics N.V.

Inventor： Michael Ansorge ,  Giuseppina Biundo Lotito ,  Benito Carnero

IPC: G10L019/10

CPC classification number: G10L19/12 ,  G10L19/08

Abstract: A method for encoding wideband speech includes sampling the speech to obtain successive voice frames each comprising a predetermined number of samples, and determining for each voice frame parameters of a linear prediction model. The parameters include a long-term excitation word extracted from an adaptive coded directory, and a short-term excitation word extracted from a fixed coded directory. The extraction of the long-term excitation word is performed using a first weighting filter. The extraction of the short-term excitation word is performed using a second weighting filter cascaded with a third weighting filter. The first and third weighting filters are equal.

Abstract translation: 一种用于编码宽带语音的方法包括对语音进行采样，以获得每个包括预定数量样本的连续语音帧，并且确定线性预测模型的每个语音帧参数。 这些参数包括从自适应编码目录中提取的长期激励词和从固定编码目录中提取的短期激励词。 使用第一加权滤波器来执行长期激励字的提取。 使用与第三加权滤波器级联的第二加权滤波器来执行短期激励字的提取。 第一和第三加权滤波器相等。

公开(公告)号：US20040064312A1

公开(公告)日：2004-04-01

申请号：US10622020

申请日：2003-07-17

Applicant: STMicroelectronics N.V.

Inventor： Michael Ansorge ,  Giuseppina Biundo Lotito ,  Benito Carnero

IPC: G10L019/04

CPC classification number: G10L19/12

Abstract: A method for encoding speech includes sampling speech to obtain successive voice frames each having a predetermined number of samples, and determining parameters of a linear prediction model for each voice frame. The parameters include a long-term excitation word extracted from an adaptive coded directory using a first linear prediction filter and an associated long-term gain. The parameters further include a short-term excitation word extracted from a fixed coded directory and an associated short-term gain. The adaptive coded directory is updated based upon the extracted long-term excitation word and the extracted short-term excitation word. The first linear prediction filter is updated using the short-term excitation word filtered by a second filter. The second filter has an order greater than or equal to 1 and coefficients thereof depend on the long-term gain for reducing a short-term excitation contribution when a long-term excitation gain is greater than a threshold.

Abstract translation: 一种用于编码语音的方法包括采样语音以获得每个具有预定数量样本的连续语音帧，以及确定每个语音帧的线性预测模型的参数。 参数包括使用第一线性预测滤波器和相关联的长期增益从自适应编码目录提取的长期激励词。 这些参数还包括从固定编码目录中提取的短期激励词和相关联的短期增益。 基于提取的长期激励词和提取的短期激励词来更新自适应编码目录。 使用由第二滤波器滤波的短期激励字来更新第一线性预测滤波器。 第二滤波器具有大于或等于1的阶数，并且当长期激励增益大于阈值时，其系数取决于用于减少短期激励贡献的长期增益。