专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

11. 发明授权

US5142582A Speech coding and decoding system with background sound reproducing function 失效
标题翻译：具有背景声音功能的语音编码和解码系统
公开(公告)号：US5142582A
公开(公告)日：1992-08-25
申请号：US511768
申请日：1990-04-20
申请人： Yoshiaki Asakawa , Toshiyuki Aritsuka
发明人： Yoshiaki Asakawa , Toshiyuki Aritsuka
IPC分类号： G10L19/00 , H04B1/66 , H04B14/04 , H04L1/00
CPC分类号： H04B1/66
摘要： In speech decoding, a transmission code, which includes an error correcting code added to a speech code, is received and whether or not there is a code error is detected on the basis of the error correcting code. At this time, when there is no code error or when the detected code error has been corrected, a normal speech decoding processing is executed. On the other hand, when there is a code error which is impossible to be corrected, artificially background sound corresponding to the decoded speech is generated from characteristic parameters indicating unvoiced sound in the decoded speech. The parameters are continuously extracted from the decoded speech, stored in a memory and are used to replace an erroneous portion of the speech code.
摘要翻译：在语音解码中，接收包括添加到语音码的纠错码的发送码，并根据纠错码检测是否存在码错误。此时，当没有代码错误或者当检测到的代码错误已经被校正时，执行正常语音解码处理。另一方面，当存在不可能校正的代码错误时，从解码语音中指示无声音的特征参数产生与解码语音相对应的人为背景音。这些参数从被解码的语音中连续提取，存储在存储器中，并用于替换语音码的错误部分。

12. 发明授权

US5956686A Audio signal coding/decoding method 失效
标题翻译：音频信号编码/解码方式
公开(公告)号：US5956686A
公开(公告)日：1999-09-21
申请号：US497474
申请日：1995-06-30
申请人： Makoto Takashima , Yoshiaki Asakawa , Hidetoshi Sekine
发明人： Makoto Takashima , Yoshiaki Asakawa , Hidetoshi Sekine
IPC分类号： G10L11/00 , G10L19/00 , G10L19/02 , G10L9/04 , G10L9/14
CPC分类号： G10L19/0212
摘要： An adaptive transform coding/and decoding arrangement is provided to effectively exploit different redundancies between the bands of a spectrum envelope to effect coding at a low bit rate for an audio signal. In the adaptive transform coding method, the spectrum envelope is divided into bands so that different coding methods may be applied to the spectrum envelopes of the individual bands. By applying the present invention to the adaptive transform coding of an audio signal, the spectrum envelope can be adjusted to the coding/and transmission method which is suitable for the time fluctuation in each frequency band, so that the different redundancies for the individual bands can be effectively exploited to realize a highly efficient audio signal coding/and decoding method which has its bits reduced as required for coding the spectrum envelope.
摘要翻译：提供自适应变换编码/解码装置以有效地利用频谱包络的频带之间的不同冗余度来实现音频信号的低比特率的编码。在自适应变换编码方法中，将频谱包络分为频带，使得不同的编码方法可以应用于各个频带的频谱包络。通过将本发明应用于音频信号的自适应变换编码，可以将频谱包络调整为适合于每个频带中的时间波动的编码和/或传输方法，使得各个频带的不同冗余可以有效地实现高效率的音频信号编码/解码方法，其对于对频谱包络进行编码所需的位减少。

13. 发明授权

US5566191A Soft decision maximum likelihood decoding method with adaptive metric 失效
标题翻译：具有自适应度量的软判决最大似然解码方法
公开(公告)号：US5566191A
公开(公告)日：1996-10-15
申请号：US57813
申请日：1993-05-07
申请人： Makoto Ohnishi , Yasuko Shinata , Yoshiaki Asakawa , Masahiro Koya
发明人： Makoto Ohnishi , Yasuko Shinata , Yoshiaki Asakawa , Masahiro Koya
IPC分类号： H04L25/08 , H03M13/23 , H04L1/00 , H04L27/00 , H04L1/20 , H03M13/12
CPC分类号： H04L1/0047 , H03M13/23 , H04L1/0054
摘要： There is provided a maximum likelihood decoding method, and an apparatus, capable of correcting burst errors caused by abrupt lowering of the signal amplitude. The soft decision maximum likelihood decoding method is a maximum likelihood decoding method for conducting maximum likelihood decoding on a received train resulting from addition of an error train to a transmission code train, which has been obtained by coding an information train by using convolutional codes on a transmission side. The soft decision maximum likelihood decoding method includes the step of making corrections by multiplying the soft decision likelihood metric having a multi-valued level, which has been obtained by soft decision likelihood metric from the received train, by weighting coefficients depending upon an instantaneous amplitude of the received signal, and the step of conducting maximum likelihood decoding by using corrected soft decision likelihood metric values. Thereby, it becomes possible to enhance the error correcting capability of error correcting apparatuses used in mobile radio communication or the like with severe fading. As a result, communication reliability is increased.
摘要翻译：提供了一种最大似然解码方法和一种能够校正由信号幅度突然降低引起的突发错误的装置。软决策最大似然解码方法是一种最大似然解码方法，用于对由接收到的列车进行最大似然解码，该方法是通过对传输代码串添加错误列来获得的，该传输代码序列是通过使用卷积码对传输侧。软决策最大似然解码方法包括以下步骤：通过将已经通过软判决似然度量从接收到的列车获得的具有多值级别的软判决似然度量乘以根据瞬时幅度接收信号，以及通过使用校正的软判决似然度量值进行最大似然解码的步骤。由此，可以提高具有严重衰落的移动无线通信等中使用的纠错装置的纠错能力。结果，通信可靠性提高。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式