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    • 2. 发明专利
    • Method, device and program of packet loss concealment in voip voice communication
    • VOIP语音通信中分组丢失隐藏的方法,设备和程序
    • JP2005107283A
    • 2005-04-21
    • JP2003341918
    • 2003-09-30
    • Tadashi AokiTakashi Nakano隆司 中野直史 青木
    • AOKI TADASHINAKANO TAKASHI
    • G10L19/00
    • PROBLEM TO BE SOLVED: To provide a method and a device of packet loss concealment in VoIP communication which can effectively perform error concealment by waveform duplication of a packet lost in the VoIP voice communication with high accuracy in order to suppress deterioration of call quality in VoIP as much as possible.
      SOLUTION: When the device detects the packet lost in reception of packets transmitted via an IP network, calculates pitches of frames before and after a lost part in the lost packet (steps S17, S19), calculates pitch fluctuation rate from the pitches of the frames before and after the lost part (a step S21), compares the pitch fluctuation rate with a predetermined threshold (a step S23), when the pitch fluctuation rate is larger than the predetermined threshold as a result of this comparison, executes a regular 2-side PWR(Pitch Waveform Replication) method (a step S25) and when the pitch fluctuation rate is smaller than the predetermined threshold, executes a 2-side PWR method in consideration of the pitch fluctuation rate (a step S27).
      COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:提供VoIP通信中的分组丢失隐藏的方法和设备,其可以通过以高精度在VoIP语音通信中丢失的分组的波形复制来有效地执行错误隐藏,以便抑制呼叫的恶化 VoIP的质量尽可能多。

      解决方案:当设备检测到通过IP网络发送的分组接收到的分组丢失时,计算丢失分组中丢失部分之前和之后的帧间距(步骤S17,S19),从节距计算音调波动率 在步骤S21之前和之后的帧中,当作为该比较的结果,当音调波动率大于预定阈值时,将音调波动率与预定阈值进行比较(步骤S23),执行 规则的2侧PWR(间距波形复制)方法(步骤S25),并且当音调波动率小于预定阈值时,考虑到音调波动率执行2侧PWR方法(步骤S27)。 版权所有(C)2005,JPO&NCIPI

    • 3. 发明专利
    • METHOD AND SYSTEM FOR VoIP VOICE COMMUNICATION, AND ITS TRANSMITTING TERMINAL, RECEIVING TERMINAL AND PROGRAM
    • 用于VoIP语音通信的方法和系统及其发送终端,接收终端和程序
    • JP2005110018A
    • 2005-04-21
    • JP2003342298
    • 2003-09-30
    • Tadashi AokiTakashi Nakano隆司 中野直史 青木
    • AOKI TADASHINAKANO TAKASHI
    • H03M7/30
    • PROBLEM TO BE SOLVED: To provide a VoIP (Voice over Internet Protocol) voice communication method and a system for widening a band for voice data, improving an SNR, and improving voice communication quality. SOLUTION: At a transmitting side, a downsampling means 1 downsamples voice data, an auxiliary information generating means 5 generates auxiliary information required for band widening from the downsampled voice data, an encoding means 3 encodes the downsampled voice data, and a steganography embedding means 7 embeds the auxiliary information in the encoded voice data. At a receiving side, the auxiliary information embedded in the received voice data is extracted, the voice data are decoded, high pass components are generated on the basis of the extracted voice data, the high pass components are added to reduction components of the voice data, and the resultant data are upsampled and outputted. COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:提供VoIP(语音电话协议)语音通信方法和用于扩大用于语音数据的频带,提高SNR,提高语音通信质量的系统。 解决方案:在发送侧,下采样装置1对话音数据进行下采样,辅助信息产生装置5从下采样的语音数据生成频带扩展所需的辅助信息,编码装置3对下采样的语音数据进行编码和隐写 嵌入装置7将辅助信息嵌入编码语音数据中。 在接收侧,提取嵌入在接收到的语音数据中的辅助信息,语音数据被解码,基于所提取的语音数据生成高通分量,将高通分量添加到语音数据的缩小分量 并且对所得数据进行上采样并输出。 版权所有(C)2005,JPO&NCIPI