公开(公告)号：US20040141572A1

公开(公告)日：2004-07-22

申请号：US10248448

申请日：2003-01-21

Inventor： Phillip Marc Johnson ,  Ramanathan Asokan

IPC: H04B001/10

CPC classification number: H04L1/0046 ,  H04L1/0014 ,  H04L1/0038 ,  H04L1/0054 ,  H04L1/0075 ,  H04L1/20 ,  H04L1/201

Abstract: A method of estimating initial channel quality in a receiver when allocated a new channel in order to select an optimal codec mode in a multi-rate service is disclosed. One implementation initially fills the filter state with the first received channel quality measurement. Another embodiment proportionally fills the entire filter state with the calculated channel quality measurements. Yet another embodiment uses the hysteresis and threshold parameters in conjunction with the initial codec mode to calculate an initial fill value for the filter state.

Abstract translation: 公开了一种在分配新信道以估计多速率业务中选择最佳编解码方式时估计接收机初始信道质量的方法。 一个实施方案首先用第一接收的信道质量测量填充过滤状态。 另一个实施例用计算的信道质量测量结果成比例地填充整个过滤器状态。 又一实施例结合初始编解码器模式使用滞后和阈值参数来计算滤波器状态的初始填充值。

公开(公告)号：US06681203B1

公开(公告)日：2004-01-20

申请号：US09257950

申请日：1999-02-26

Applicant: James P. Seymour ,  Michael D. Turner

Inventor： James P. Seymour ,  Michael D. Turner

IPC: G01L1912

CPC classification number: H04L1/0046 ,  G10L19/18 ,  H04L1/0061 ,  H04L1/007 ,  H04L1/201

Abstract: A method of insuring the accuracy of transmitted or stored digital data involves the use of a cyclical redundancy check (CRC) code. The method is particularly useful for ensuring the accuracy of frames transmitted between multi-mode vocoders. The method allows a different CRC code to be used for each mode of a transmitting multi-mode vocoder. A receiving multi-mode vocoder checks the CRC code against the CRC coding formulas of the various modes. If the CRC code is satisfied under any one of the modes, the frame is labeled as “good”. If the CRC code fails under all the modes, the frame is labeled as “bad”. If the bit frame includes bits for indicating the mode of the transmitting multi-mode vocoder, the receiving multi-mode vocoder checks the CRC code against the CRC coding formula for the indicated mode only. If the CRC code passes for the indicated mode, the frame is labeled as “good”, otherwise, the frame is labeled as “bad”.

Abstract translation: 确保发送或存储的数字数据的准确性的方法涉及使用循环冗余校验（CRC）码。 该方法对于确保在多模式声码器之间传输的帧的精度特别有用。 该方法允许将不同的CRC码用于发送多模式声码器的每个模式。 接收多模式声码器根据各种模式的CRC编码公式检查CRC码。 如果在任何一种模式下满足CRC码，则将该帧标记为“良好”。 如果CRC码在所有模式下都失败，则该帧被标记为“坏”。 如果比特帧包括用于指示发送多模式声码器的模式的比特，则接收多模式声码器仅针对所指示的模式根据CRC编码公式检查CRC码。 如果CRC码通过指示模式，则将该帧标记为“良好”，否则将该帧标记为“不良”。

公开(公告)号：US20030152169A1

公开(公告)日：2003-08-14

申请号：US10075008

申请日：2002-02-13

Inventor： Dayong Chen

IPC: H04L027/06

CPC classification number: H04L1/0047 ,  H04L1/0057 ,  H04L1/0059 ,  H04L1/20 ,  H04L1/201

Abstract: A received information signal is decoded to obtain the received information and to produce at least one feature of the received information signal. The received information signal is preliminarily classified as containing a normal burst or a truncated burst based upon the at least one feature, to obtain a preliminary classification. Cyclic redundancy checking of the received information that is decoded is performed. The received information signal is then further classified as containing a normal burst or a truncated burst based upon the preliminary classification and whether the cyclic redundancy checking is valid, to obtain a further classification. The received information signal may be still further classified as containing a normal burst or a truncated burst based upon the further classification and at least one transition rule for normal bursts and truncated bursts between the received information signal and a previously received information signal.

公开(公告)号：US20030142728A1

公开(公告)日：2003-07-31

申请号：US10061865

申请日：2002-01-31

Inventor： Yu-Chuan Lin

IPC: H04B001/69

CPC classification number: H04L1/20 ,  H04B1/7115 ,  H04L1/201 ,  H04W24/00 ,  H04W52/0216 ,  H04W52/0245 ,  H04W52/286 ,  H04W52/288 ,  H04W52/44 ,  Y02D70/25 ,  Y02D70/40

Abstract: Novel techniques are disclosed for detecting discontinuous transmission (DTX) over a communication channel. A received data frame is characterized as one of a Good frame, Erasure, or DTX. If a Good frame is not initially detected, a multi-dimensional quality metric is used to characterize the received frame as either an Erasure or DTX. A two dimensional quality metric may be generated using energy per bit to noise power ratio as a first dimension and re-encoded symbol error count as a second dimension. Alternatively, re-encoded symbol energy may be used as the second dimension of the quality metric. The communication channel may be a CDMA wireless communication channel capable of DTX and the device may be a base station, base station controller, or mobile station.

Abstract translation: 公开了用于通过通信信道检测不连续传输（DTX）的新技术。 接收到的数据帧被表征为Good帧，Erasure或DTX之一。 如果最初没有检测到好的帧，则使用多维质量度量来将接收的帧表征为擦除或DTX。 可以使用每比特噪声功率比的能量作为第一维度并且将重新编码的符号错误计数作为第二维度来生成二维质量度量。 或者，重新编码的符号能量可以用作质量度量的第二维度。 通信信道可以是能够进行DTX的CDMA无线通信信道，并且设备可以是基站，基站控制器或移动台。

公开(公告)号：US06298084B1

公开(公告)日：2001-10-02

申请号：US09199114

申请日：1998-11-24

Applicant: Niels Vinggaard ,  Ashish Batra ,  Brett Robertson ,  Brian Keith Classon

Inventor： Niels Vinggaard ,  Ashish Batra ,  Brett Robertson ,  Brian Keith Classon

IPC: H04B1700

CPC classification number: H04L1/005 ,  H04L1/0054 ,  H04L1/201

Abstract: A window error detector for a receiver capable of operating in a discontinuous transmit mode includes a soft decision decoder (210) producing soft output and generating window error signals. A detector (214) is coupled to the soft decision decoder for detecting a bad frame when the window error exceeds a bad frame threshold, wherein the threshold is altered based on the discontinuous transmit state. A turbo decoder (210) for a receiver includes a soft decision decoder and a window error detector (214) coupled to the soft decision decoder. The window error detector generates a bad frame indication. The turbo decoder stops iterative processing of the data associated with a window when the window error detector detects that the window does not result in a bad frame indication.

Abstract translation: 用于能够以不连续发送模式操作的接收机的窗口误差检测器包括产生软输出并产生窗口误差信号的软判决解码器（210）。 当窗口错误超过错误帧阈值时，检测器（214）耦合到软判决解码器，用于检测错误帧，其中基于不连续发送状态改变阈值。 用于接收机的turbo解码器（210）包括软判决解码器和耦合到软判决解码器的窗口错误检测器（214）。 窗口错误检测器生成不良帧指示。 当窗口错误检测器检测到窗口不会导致错误的帧指示时，turbo解码器停止与窗口相关联的数据的迭代处理。

公开(公告)号：US6092230A

公开(公告)日：2000-07-18

申请号：US121809

申请日：1993-09-15

Applicant: Sandra L. Wood ,  Thomas J. Kundmann ,  Lee M. Proctor ,  Ken Stewart

Inventor： Sandra L. Wood ,  Thomas J. Kundmann ,  Lee M. Proctor ,  Ken Stewart

IPC: H03M13/00 ,  H04B14/04 ,  H04J3/00 ,  H04J3/14 ,  H04L1/00 ,  H04L1/20

CPC classification number: H04L1/007 ,  H03M13/00 ,  H04L1/0045 ,  H04L1/201 ,  H04L1/208

Abstract: A communication system implements detection of bad frames of information by utilizing multiple bit correction thresholds. Equipment used within the communication system adapts to different signaling environments by dynamically altering the bit correction threshold based on a history of the number of consecutive bad frames of information that have been previously erased and the number of bits corrected by a channel decoder (202). By implementing this dynamic bit correction threshold, sufficient bad frame indication (BFI) detection and receiver sensitivity can be obtained simultaneously, which results in an improved perceived audio quality to the end user.

Abstract translation: 通信系统通过利用多个比特校正阈值来实现对坏帧信息的检测。 在通信系统中使用的设备通过基于先前已被擦除的连续坏信息的数量的历史和由信道解码器（202）校正的比特数来动态地改变比特校正阈值来适应不同的信令环境。 通过实现这种动态位校正阈值，可以同时获得足够的坏帧指示（BFI）检测和接收机灵敏度，这样可以使最终用户的感知音质提高。

公开(公告)号：US06026506A

公开(公告)日：2000-02-15

申请号：US939109

申请日：1997-09-26

Applicant: Richard Eugene Anderson ,  Eric Michael Foster ,  George Wilson Rohrbaugh

Inventor： Richard Eugene Anderson ,  Eric Michael Foster ,  George Wilson Rohrbaugh

IPC: H04L1/00 ,  H04N19/89 ,  H04N19/895 ,  H04N21/238 ,  H04N21/434 ,  G06F11/00

CPC classification number: H04L1/201 ,  H04L1/0045 ,  H04N19/89 ,  H04N19/895 ,  H04N21/238 ,  H04N21/434

Abstract: Method and apparatus for processing a data stream. Errors are concealed in the data stream by detecting loss or interruption of data delivery and signalling decoders to invoke error concealment.

Abstract translation: 用于处理数据流的方法和装置。 通过检测数据传输的丢失或中断以及信令解码器来调用错误隐藏，将错误隐藏在数据流中。

公开(公告)号：US5936979A

公开(公告)日：1999-08-10

申请号：US930187

申请日：1997-09-24

Applicant: Kari Jyrkka

Inventor： Kari Jyrkka

IPC: H04L1/00 ,  H04B1/10 ,  H04B7/26 ,  H04L1/20 ,  G11C29/00

CPC classification number: H04L1/201 ,  H04L1/20

Abstract: A method for frame quality detection and a receiver for implementing the method. For frame quality detection, results A and B are compared with each other and with a predetermined threshold. The result A is formed as a sum/product of soft bit decisions or as a bit error rate from bursts comprising bits from successive frames N and N+1. The result B is formed in the same way from frames N-1 and N. When comparing the result A and the result B with each other, the frame N is determined to be bad if one of the result A and the result B is essentially smaller than another of the result A and the result B. The frame N is also determined to be bad if the both result A and the result B are smaller than the predetermined threshold value. The method improves detection of a bad frame and accordingly reduces interference sound received by a receiver and caused by erroneously interpreted bad frames, especially during periods of silence.

Abstract translation: PCT No.PCT / FI97 / 00032 Sec。 371日期：1997年9月24日 102（e）1997年9月24日PCT PCT 1997年1月23日PCT公布。 公开号WO97 / 27686 日期1997年7月31日用于帧质量检测的方法和用于实现该方法的接收器。 对于帧质量检测，将结果A和B相互比较并具有预定阈值。 结果A形成为软比特决定的和/乘积或作为来自连续帧N和N + 1的比特的脉冲串的误码率。 结果B以与帧N-1和N相同的方式形成。当将结果A和结果B相互比较时，如果结果A和结果B中的一个基本上是相同的，则确定帧N是坏的 小于结果A的另一个和结果B.如果结果A和结果B都小于预定阈值，则帧N也被确定为坏。 该方法改善了对错误帧的检测，并因此减少了接收机接收到的干扰声音，并由错误解释的坏帧引起，特别是在沉默期间。

公开(公告)号：US5901186A

公开(公告)日：1999-05-04

申请号：US737765

申请日：1996-10-28

Applicant: Karim Jamal ,  Fredrik Jansson

Inventor： Karim Jamal ,  Fredrik Jansson

IPC: H04B14/04 ,  H04L1/00 ,  H04L1/20 ,  H04L25/03 ,  H03D1/04 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10

CPC classification number: H04L1/20 ,  H04L1/0057 ,  H04L1/0071 ,  H04L1/201 ,  H04L25/03178

Abstract: In a digital radio communication system in which information is transmitted and received in time slots and some bits of each received audio frame is interleaved over at least two time slots and other bits in each audio frame at are non-interleaved, bad received audio frames are detected by detecting possible bit errors in a channel encoded non-interleaved bit sequence in each received time slot. If bit errors have been detected in this bit sequence a bad received frame is indicated.

Abstract translation: PCT No.PCT / SE95 / 00423 Sec。 371日期1996年10月28日第 102（e）日期1996年10月28日PCT 1995年4月19日PCT PCT。 WO95 / 30282 PCT公开 日期：1995年11月9日在数字无线电通信系统中，其中在时隙中发送和接收信息，并且每个接收的音频帧的某些比特在至少两个时隙上进行交织，并且每个音频帧中的其他比特是非交织的， 通过检测每个接收到的时隙中的信道编码的非交错比特序列中的可能比特错误来检测不良的接收音频帧。 如果在该位序列中检测到位错误，则指示错误的接收帧。

公开(公告)号：US5815507A

公开(公告)日：1998-09-29

申请号：US632701

申请日：1996-04-15

Applicant: Niels Vinggaard ,  Arvind S. Arora

Inventor： Niels Vinggaard ,  Arvind S. Arora

IPC: H03M13/00 ,  H03M13/35 ,  H03M13/39 ,  H04L1/00 ,  H04L1/20 ,  G06F11/00 ,  G06F11/10

CPC classification number: H04L1/201 ,  H03M13/00 ,  H03M13/35 ,  H03M13/39 ,  H04L1/0054 ,  H04L1/20 ,  H04L1/208 ,  H04L2001/0098

Abstract: An error detector circuit (300) for a discrete receiver indicates bad frames of binary information signals which contain distorted bits of data in numbers so great as to prevent a convolutional decoder (738) from generating, accurately, a decoded signal. A variable threshold generator (440) generates a variable threshold level according to the signal quality estimate for the received signal. When bit errors are detected in numbers beyond the variable threshold or when a first preselected value of the signal quality of a received signal combined with the detected number of bit errors forms a signal beyond a second preselected value, a bad frame is indicated.

Abstract translation: 用于离散接收机的误差检测器电路（300）指示二进制信息信号的错误帧，其包含数字的数据失真位数，以防止卷积解码器（738）准确地产生解码信号。 可变阈值生成器（440）根据接收信号的信号质量估计生成可变阈值电平。 当以超过可变阈值的数字检测到比特错误时，或者当接收信号的信号质量的第一预选值与检测到的比特错误数量组合形成超过第二预选值的信号时，指示不良帧。