公开(公告)号：EP0984570A2

公开(公告)日：2000-03-08

申请号：EP99306658.8

申请日：1999-08-23

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Hoffbeck, Joseph P. ,  Meyers, Martin Howard ,  Premji, Al-Nasir A. ,  Tarraf, Ahmed A. ,  Tracy, Kevin G.

IPC: H04B7/26

CPC classification number: H04B7/26

Abstract: It has been recognized that in a wireless communication system certain frames of encoded speech data transmitted between a base station and a mobile unit, or between a mobile unit and a base station, are more critical than others. A frame may be determined to be erased by the receiving base station or mobile unit due to noise or interference over the wireless transmission medium. If an erased frame cannot be recreated from one or more preceding frames, then it is more critical than a frame that can be recreated by an extrapolation of data from one or more preceding frames. Accordingly, on a frame-by-frame basis, each frame in a sequence of frames is identified as being critical or non-critical. Each frame that is identified as being critical is then transmitted in a manner that is more robust than the manner in which non-critical frames are transmitted to decrease the likelihood that a receiver will determine that the frame is erased. In a CDMA system, a current frame is identified as being critical by forming a weighted sum of the differences between corresponding frame parameters that represent the current frame and frame parameters that represent a previous frame. That weighted sum is compared with a threshold. If the weighted sum exceeds the threshold, then the current frame is classified as being a critical frame and is transmitted at a higher output level than non-critical frames are transmitted.

Abstract translation: 人们已经认识到在无线通信系统中的编码语音数据的反式基站和移动单元，或一个移动单元和一个基站之间的mitted某些帧一样，比其它的更重要。 框架可以是确定性的开采到由接收基站或移动单元因噪声或干扰通过无线传输介质被擦除。 如果在擦除的帧不能从一个或多个preceding-帧被重新创建，那么它是更关键的比帧确实可以通过从一个或多个preceding-帧的数据外推被重新创建。 因此，在一帧接一帧的基础上，在帧序列中每一帧被标识为关键或非关键。 每个帧都被标识为关键的是然后以这样的方式反式mitted所做的是比其中非关键帧是反式mitted降低的可能性做了接收机想要确定性矿所做的帧被擦除的方式更加健壮。 在CDMA系统中，当前帧被识别为通过形成的对应帧参数之差的加权和临界确实代表当前帧和帧参数做了表示前一帧。 这加权总和与阈值进行比较。 如果加权和超过阈值，则当前帧是作为一个关键帧分类和为反式mitted更高的输出电平比在非关键帧是反式mitted。

公开(公告)号：EP0982904A2

公开(公告)日：2000-03-01

申请号：EP99306467.4

申请日：1999-08-17

Applicant: Lucent Technologies Inc.

Inventor： Tarraf, Ahmed A.

IPC: H04L17/00

CPC classification number: H04L1/08

Abstract: A method for conveying information-carrying teletype signals over a wireless telecommunication system by encoding the information into a repetitive signal. Teletype information is derived from part of a received signal encoded as a repetitive signal which part has been determined not to have been adversely affected by the wireless telecommunication system.

Abstract translation: 一种通过将信息编码成重复信号来通过无线电信系统传送信息携带电传信号的方法。 电传信息从被编码为重复信号的接收信号的部分导出，该部分已被确定为不受无线电信系统的不利影响。

公开(公告)号：EP0984570B1

公开(公告)日：2006-12-06

申请号：EP99306658.8

申请日：1999-08-23

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Hoffbeck, Joseph P. ,  Meyers, Martin Howard ,  Premji, Al-Nasir A. ,  Tarraf, Ahmed A. ,  Tracy, Kevin G.

IPC: H04B7/26 ,  H04L1/00 ,  G10L19/00

CPC classification number: H04B7/26

公开(公告)号：EP1204093A1

公开(公告)日：2002-05-08

申请号：EP01304280.9

申请日：2001-05-14

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cao, Binshi ,  Tarraf, Ahmed A. ,  Valdes, Jesus Manuel ,  Yang, Yang

IPC: G10L19/00

CPC classification number: G10L19/012

Abstract: Communication links between elements of a communication system are used more efficiently by transmitting comfort noise messages discontinuously. When periods of silence or messages containing comfort noise are detected, a single comfort noise message is transmitted rather than a long sequence of comfort noise messages. As a result, the bandwidth of communication links is not wasted by sending large numbers of messages containing comfort noise. The comfort noise is reconstructed at a communication element receiving the reduced number of messages by generating new comfort noise messages to replace the missing comfort noise messages. One method of regenerating comfort noise messages is to simply repeat the most recently received comfort noise message until a new comfort noise message is received.

Abstract translation: 通过不连续地发送舒适噪声消息，更有效地使用通信系统的元件之间的通信链路。 当检测到沉默周期或包含舒适噪声的消息时，发送单个舒适噪声消息，而不是长序列的舒适噪声消息。 因此，通过发送大量包含舒适噪声的消息，通信链路的带宽不会浪费。 通过产生新的舒适噪声消息来代替丢失的舒适噪声消息，在通信元件处重建接收消息数量减少的舒适噪声。 重新产生舒适噪声消息的一种方法是简单地重复最近接收的舒适噪声消息，直到接收到新的舒适噪声消息。

公开(公告)号：EP0984570A3

公开(公告)日：2004-01-14

申请号：EP99306658.8

申请日：1999-08-23

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Hoffbeck, Joseph P. ,  Meyers, Martin Howard ,  Premji, Al-Nasir A. ,  Tarraf, Ahmed A. ,  Tracy, Kevin G.

IPC: H04B7/26 ,  H04L1/00 ,  G10L19/00

CPC classification number: H04B7/26

Abstract: It has been recognized that in a wireless communication system certain frames of encoded speech data transmitted between a base station and a mobile unit, or between a mobile unit and a base station, are more critical than others. A frame may be determined to be erased by the receiving base station or mobile unit due to noise or interference over the wireless transmission medium. If an erased frame cannot be recreated from one or more preceding frames, then it is more critical than a frame that can be recreated by an extrapolation of data from one or more preceding frames. Accordingly, on a frame-by-frame basis, each frame in a sequence of frames is identified as being critical or non-critical. Each frame that is identified as being critical is then transmitted in a manner that is more robust than the manner in which non-critical frames are transmitted to decrease the likelihood that a receiver will determine that the frame is erased. In a CDMA system, a current frame is identified as being critical by forming a weighted sum of the differences between corresponding frame parameters that represent the current frame and frame parameters that represent a previous frame. That weighted sum is compared with a threshold. If the weighted sum exceeds the threshold, then the current frame is classified as being a critical frame and is transmitted at a higher output level than non-critical frames are transmitted.

公开(公告)号：EP0982904A3

公开(公告)日：2003-10-29

申请号：EP99306467.4

申请日：1999-08-17

Applicant: Lucent Technologies Inc.

Inventor： Tarraf, Ahmed A.

IPC: H04L17/00 ,  H04M3/42 ,  H04Q7/38 ,  H04L12/28 ,  H04L29/06 ,  H04M11/06

CPC classification number: H04L1/08

Abstract: A method for conveying information-carrying teletype signals over a wireless telecommunication system by encoding the information into a repetitive signal. Teletype information is derived from part of a received signal encoded as a repetitive signal which part has been determined not to have been adversely affected by the wireless telecommunication system.

公开(公告)号：EP0887957A2

公开(公告)日：1998-12-30

申请号：EP98304767.1

申请日：1998-06-17

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Meyers, Martin Howard ,  Weaver, Carl Francis ,  Tarraf, Ahmed A.

IPC: H04B17/00

CPC classification number: G10L19/26 ,  G10L15/02 ,  G10L25/30 ,  G10L25/69 ,  H04M3/22 ,  H04M2201/40

Abstract: Telecommunications processing is applied to a reference signal to generate a signal under test. A fidelity measure is generated characterizing the fidelity of the signal under test relative to the reference signal. A control signal is generated from the fidelity measure, where the control signal is used as a feedback signal to adjust the telecommunications processing. In one embodiment, the reference signal is a speech signal and the signal under test is a decoded speech signal generated by encoding, transmitting, and decoding the reference speech signal. The fidelity signal is an average mean opinion score (MOS) and the control signal is used to control the speech decoding processing. For example, the speech decoding processing may involve a speech decoder followed by a post filter, and the control signal is the cut-off frequency of the post filter. Such an embodiment may be applied to real-time speech processing to adjust the speech decoding processing in the receiver of a telecommunications system that includes a speech encoder in a transmitter and a communications network. Intermittently, the transmitter encodes reference signals that are also known to the receiver. The receiver performs the processing of the present invention to update its speech decoding processing to optimize speech quality.

Abstract translation: 电信处理被应用于参考信号以产生被测信号。 产生保真度量，表征被测信号相对于参考信号的保真度。 从保真度测量产生控制信号，其中控制信号用作反馈信号以调整电信处理。 在一个实施例中，参考信号是语音信号，被测信号是通过对参考语音信号进行编码，发送和解码产生的解码语音信号。 保真度信号是平均意见得分（MOS），控制信号用于控制语音解码处理。 例如，语音解码处理可以包括后续的后置滤波器的语音解码器，并且控制信号是后置滤波器的截止频率。 这样的实施例可以应用于实时语音处理，以调整包括发射机和通信网络中的语音编码器的电信系统的接收机中的语音解码处理。 间歇地，发射机编码接收机也已知的参考信号。 接收机执行本发明的处理以更新其语音解码处理以优化语音质量。

公开(公告)号：EP0982904B1

公开(公告)日：2010-10-06

申请号：EP99306467.4

申请日：1999-08-17

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Tarraf, Ahmed A.

IPC: H04L17/00 ,  H04M3/42 ,  H04W4/00 ,  H04L12/28 ,  H04L29/06 ,  H04M11/06

CPC classification number: H04L1/08

公开(公告)号：EP0887957A3

公开(公告)日：2002-09-11

申请号：EP98304767.1

申请日：1998-06-17

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Meyers, Martin Howard ,  Weaver, Carl Francis ,  Tarraf, Ahmed A.

IPC: H04B17/00 ,  G10L19/14

CPC classification number: G10L19/26 ,  G10L15/02 ,  G10L25/30 ,  G10L25/69 ,  H04M3/22 ,  H04M2201/40

Abstract: Telecommunications processing is applied to a reference signal to generate a signal under test. A fidelity measure is generated characterizing the fidelity of the signal under test relative to the reference signal. A control signal is generated from the fidelity measure, where the control signal is used as a feedback signal to adjust the telecommunications processing. In one embodiment, the reference signal is a speech signal and the signal under test is a decoded speech signal generated by encoding, transmitting, and decoding the reference speech signal. The fidelity signal is an average mean opinion score (MOS) and the control signal is used to control the speech decoding processing. For example, the speech decoding processing may involve a speech decoder followed by a post filter, and the control signal is the cut-off frequency of the post filter. Such an embodiment may be applied to real-time speech processing to adjust the speech decoding processing in the receiver of a telecommunications system that includes a speech encoder in a transmitter and a communications network. Intermittently, the transmitter encodes reference signals that are also known to the receiver. The receiver performs the processing of the present invention to update its speech decoding processing to optimize speech quality.

公开(公告)号：EP1126439A3

公开(公告)日：2001-08-29

申请号：EP00307402.8

申请日：2000-08-29

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Sherif, Mahmoud R. ,  Tarraf, Ahmed A.

IPC: G10L19/14

CPC classification number: G10L19/26 ,  G10L21/0364

Abstract: This invention is directed toward improving the subjective voice quality of a mobile to mobile phone call having tandem vocoder processing by modifying the spectrum of the voice signal before it is processed by the second vocoder to compensate for digital distortion which is generated by the second vocoder. An adaptive filter can be used to modify the spectrum of the voice signal. With this invention, the voice quality of a call from a first mobile phone to a second mobile phone has a quality that is substantially similar to the voice quality of a call from a mobile phone to a desk phone.