公开(公告)号：US06223154B1

公开(公告)日：2001-04-24

申请号：US09127348

申请日：1998-07-31

申请人： Richard Brent Nicholls ,  Chin Pan Wong ,  Martin Thuo Karanja ,  Patrick Joseph Doran

发明人： Richard Brent Nicholls ,  Chin Pan Wong ,  Martin Thuo Karanja ,  Patrick Joseph Doran

IPC分类号： G10L1102

CPC分类号： H04W88/02 ,  H04M1/605

摘要： A portable communication device (104), such as a cellular telephone, is operable in a speakerphone mode. The communication device uses a digital communication scheme, and both receives and generates vocoded signals. The speakerphone provides half duplex operation to eliminate echo. When voice activity is detected, the device activates a speaker and mutes a microphone to avoid echo. When no voice activity is detected in the received signal, the speaker is muted and the microphone activated. To determine when speech activity is present in the received signal, a novel voice activity detection (VAD) algorithm is used which takes advantage of parameters provided as part of the received vocoded signal. The new voice activity algorithm includes calculating a staggered average of the frame energy value for a sequence of received frames, and determining if the staggered average value exceeds a threshold. The algorithm also includes adjusting the threshold level by basing the threshold level on the voicing value of the present vocoded frame.

摘要翻译： 诸如蜂窝电话的便携式通信设备（104）可以在免提电话模式下操作。 通信设备使用数字通信方案，并且都接收和生成语音信号。 扬声器提供半双工操作以消除回波。 当检测到语音活动时，设备激活扬声器并使麦克风静音以避免回音。 在接收到的信号中没有检测到语音活动时，扬声器被静音并且麦克风被激活。 为了确定接收到的信号中是否存在语音活动，使用新颖的语音活动检测（VAD）算法，其利用作为所接收的声码信号的一部分提供的参数。 新的语音活动算法包括计算接收帧序列的帧能量值的交错平均值，以及确定交错平均值是否超过阈值。 该算法还包括通过将阈值水平基于当前语音帧的语音值来调整阈值水平。

公开(公告)号：US6157906A

公开(公告)日：2000-12-05

申请号：US127925

申请日：1998-07-31

申请人： Richard Brent Nicholls ,  Chin Pan Wong ,  Martin Thuo Karanja ,  Patrick Joseph Doran ,  David James Graham

发明人： Richard Brent Nicholls ,  Chin Pan Wong ,  Martin Thuo Karanja ,  Patrick Joseph Doran ,  David James Graham

IPC分类号： G10L11/02 ,  G10L11/06

CPC分类号： G10L25/78

摘要： A digital signal processor (100) receives a digitally vocoded signal (102), and calculates a staggered average value (404) from the frame energy of each received frame, or the product of the frame energy and a voicing value. While the staggered average value is above a threshold voice indicator value, speech is declared present.

摘要翻译： 数字信号处理器（100）接收数字声码信号（102），并根据每个接收帧的帧能量或帧能量与浊音值的乘积来计算交错平均值（404）。 虽然交错的平均值高于阈值语音指标值，但声明声明存在。

公开(公告)号：US6122531A

公开(公告)日：2000-09-19

申请号：US127536

申请日：1998-07-31

申请人： Richard Brent Nicholls ,  Scott David Koenigsman ,  Patrick Joseph Doran

发明人： Richard Brent Nicholls ,  Scott David Koenigsman ,  Patrick Joseph Doran

IPC分类号： H04B1/46 ,  H04B1/38

CPC分类号： H04B1/46

摘要： In a portable communication device (104) that is able to operate in a speakerphone mode, a user interface such as a keypad (120) and display (122) are provided to allow the user to select (1104) an enhanced mode so that leading fricatives of speech are more likely to be detected as speech, and played over a speaker (214). Upon selecting the enhanced mode of operation, the voicing value of each frame of vocoded speech received is increased, thus making it more likely for energetic fricative frames to be detected as speech.

摘要翻译： 在能够以扬声器电话模式操作的便携式通信设备（104）中，提供诸如键盘（120）和显示器（122）的用户接口，以允许用户选择（1104）增强模式，使得引导 语音的摩擦更有可能被检测为语音，并且通过扬声器播放（214）。 在选择增强的操作模式时，接收到的语音语音的每个帧的发声值增加，从而使得能量检测作为语音更有可能。

公开(公告)号：US5684811A

公开(公告)日：1997-11-04

申请号：US523103

申请日：1995-09-01

申请人： Patrick Joseph Doran

发明人： Patrick Joseph Doran

IPC分类号： H03M13/41 ,  H03M13/12

CPC分类号： H03M13/4169 ,  H03M13/41

摘要： An apparatus (800) processes a data stream of convolutionally encoded information and generates decoded information using a series of symbol selections that potentially correspond to at least a portion of the data stream (610, 620). A first reliability indication is obtained for a particular decision made for a symbol selection (630). When the reliability indicator does not satisfy a particular criteria, a traceback is performed along the series of symbol selections to develop a second reliability indication based on whether, after adjusting for allowable error patterns, an alternative set of symbol selections yields the decoded information within a predetermined number of symbol selections (635, 640, 645, 650, 655, 660, 665). An action is taken based on the second reliability indication (670).

摘要翻译： 装置（800）处理卷积编码信息的数据流，并使用潜在对应于数据流（610,620）的至少一部分的一系列符号选择来生成解码信息。 获得针对符号选择的特定决定的第一可靠性指示（630）。 当可靠性指示符不满足特定标准时，沿着一系列符号选择执行回溯，以便基于在可允许的错误模式调整之后，替代的一组符号选择是否产生解码的信息，以产生第二可靠性指示 预定数量的符号选择（635,640,645,650,655,660,665）。 基于第二可靠性指示采取动作（670）。