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1. 发明申请

WO2010003563A8 AUDIO ENCODER AND DECODER FOR ENCODING AND DECODING AUDIO SAMPLES 审中-公开
标题翻译：用于编码和解码音频样本的音频编码器和解码器
公开(公告)号：WO2010003563A8
公开(公告)日：2011-04-21
申请号：PCT/EP2009004651
申请日：2009-06-26
申请人： FRAUNHOFER GES FORSCHUNG , VOICEAGE CORP , LECOMTE JEREMIE , GOURNAY PHILIPPE , BAYER STEFAN , MULTRUS MARKUS , BESSETTE BRUNO , GRILL BERNHARD
发明人： LECOMTE JEREMIE , GOURNAY PHILIPPE , BAYER STEFAN , MULTRUS MARKUS , BESSETTE BRUNO , GRILL BERNHARD
IPC分类号： G10L19/02 , G10L19/14
CPC分类号： G10L19/20 , G10L19/022
摘要： An audio encoder (100) for encoding audio samples, comprising a first time domain aliasing introducing encoder (110) for encoding audio samples in a first encoding domain, the first time domain aliasing introducing encoder (110) having a first framing rule, a start window and a stop window. The audio encoder (100) further comprises a second encoder (120) for encoding samples in a second encoding domain, the second encoder (120) having a different second framing rule. The audio encoder (100) further comprises a controller (130) switching from the first encoder (110) to the second encoder (120) in response to characteristic of the audio samples, and for modifying the second framing rule in response to switching from the first encoder (110) to the second encoder (120) or for modifying the start window or the stop window of the first encoder (110), wherein the second framing rule remains unmodified.
摘要翻译：一种用于编码音频样本的音频编码器（100），包括用于对第一编码域中的音频样本进行编码的第一时域混叠引入编码器（110），具有第一成帧规则的第一时域混叠引入编码器（110）窗口和停止窗口。音频编码器（100）还包括用于对第二编码域中的采样进行编码的第二编码器（120），第二编码器（120）具有不同的第二成帧规则。音频编码器（100）还包括响应于音频样本的特性从第一编码器（110）切换到第二编码器（120）的控制器（130），并且响应于从第二编码器第一编码器（110）到第二编码器（120）或用于修改第一编码器（110）的起始窗口或停止窗口，其中第二成帧规则保持未修改。

2. 发明申请

WO2010040522A2 MULTI-RESOLUTION SWITCHED AUDIO ENCODING/DECODING SCHEME 审中-公开
标题翻译：多分辨率切换音频编码/解码方案
公开(公告)号：WO2010040522A2
公开(公告)日：2010-04-15
申请号：PCT/EP2009007205
申请日：2009-10-07
申请人： FRAUNHOFER GES FORSCHUNG , VOICEAGE CORP , NEUENDORF MAX , BAYER STEFAN , LECOMTE JEREMIE , FUCHS GUILLAUME , ROBILLIARD JUIIEN , RETTELBACH NIKOLAUS , NAGEL FREDERIK , GEIGER RAIF , MULTRUS MARKUS , GRILL BERNHARD , GOURNAY PHILIPPE , SALAMI REDWAN
发明人： NEUENDORF MAX , BAYER STEFAN , LECOMTE JEREMIE , FUCHS GUILLAUME , ROBILLIARD JUIIEN , RETTELBACH NIKOLAUS , NAGEL FREDERIK , GEIGER RAIF , MULTRUS MARKUS , GRILL BERNHARD , GOURNAY PHILIPPE , SALAMI REDWAN
IPC分类号： G10L19/14 , G10L19/022 , G10L19/24
CPC分类号： G10L19/24 , G10L19/022
摘要： An audio encoder for encoding an audio signal comprises a first coding branch (400), the first coding branch comprising a first converter (410) for converting a signal from a time domain into a frequency domain. Furthermore, the audio encoder comprises a second coding branch (500) comprising a second time/frequency converter (523). Additionally, a signal analyzer (300/525) for analyzing the audio signal is provided. The signal analyzer, on the hand, determines whether an audio portion is effective in the encoder output signal as a first encoded signal from the first encoding branch or as a second encoded signal from a second encoding branch. On the other hand, the signal analyzer determines a time/frequency resolution to be applied by the converters (410, 523) when generating the encoded signals. An output interface includes, in addition to the first encoded signal and the second encoded signal, a resolution information identifying the resolution used by the first time/frequency converter and used by the second time/frequency converter.
摘要翻译：用于编码音频信号的音频编码器包括第一编码分支（400），第一编码分支包括用于将来自时域的信号转换成频域的第一转换器（410）。此外，音频编码器包括包括第二时间/频率转换器（523）的第二编码分支（500）。另外，提供了用于分析音频信号的信号分析器（300/525）。手持信号分析仪确定音频部分是否在编码器输出信号中作为来自第一编码分支的第一编码信号或来自第二编码分支的第二编码信号有效。另一方面，当生成编码信号时，信号分析器确定要由转换器（410,523）应用的时间/频率分辨率。除了第一编码信号和第二编码信号之外，输出接口包括识别由第一时间/频率转换器使用并由第二时间/频率转换器使用的分辨率的分辨率信息。

3. 发明申请

WO2008000316A8 AUDIO ENCODER, AUDIO DECODER AND AUDIO PROCESSOR HAVING A DYNAMICALLY VARIABLE HARPING CHARACTERISTIC 审中-公开
标题翻译：音频编码器，音频解码器和具有动态变化特征的音频处理器
公开(公告)号：WO2008000316A8
公开(公告)日：2009-02-26
申请号：PCT/EP2007004401
申请日：2007-05-16
申请人： FRAUNHOFER GES FORSCHUNG , HERRE JUERGEN , GRILL BERNHARD , MULTRUS MARKUS , BAYER STEFAN , KRAEMER ULRICH , HIRSCHFELD JENS , WABNIK STEFAN , SCHULLER GERALD
发明人： HERRE JUERGEN , GRILL BERNHARD , MULTRUS MARKUS , BAYER STEFAN , KRAEMER ULRICH , HIRSCHFELD JENS , WABNIK STEFAN , SCHULLER GERALD
IPC分类号： G10L19/00 , G10L19/20
CPC分类号： G10L19/20 , G10L19/265
摘要： An audio encoder, an audio decoder or an audio processor includes a filter (12) for generating a filtered audio signal, the filter having a variable warping characteristic, the characteristic being controllable in response to a time-varying control signal (16), the control signal indicating a small or no warping characteristic or a comparatively high warping characteristic. Furthermore, a controller (18) is connected for providing the time-varying control signal, which depends on the audio signal. The filtered audio signal can be introduced to an encoding processor (22) having different encoding algorithms, one of which is a coding algorithm adapted to a specific signal pattern. Alternatively, the filter is a post-filter receiving a decoded audio signal.
摘要翻译：音频编码器，音频解码器或音频处理器包括用于产生经滤波的音频信号的滤波器（12），滤波器具有可变翘曲特性，该特性可响应于时变控制信号（16）而被控制，指示变形特性小或不翘曲特性的控制信号。此外，控制器（18）被连接用于提供取决于音频信号的时变控制信号。滤波后的音频信号可以被引入具有不同编码算法的编码处理器（22），其中之一是适用于特定信号模式的编码算法。或者，滤波器是接收经解码的音频信号的后置滤波器。

4. 发明申请

WO2010003546A3 AN APPARATUS AND A METHOD FOR CALCULATING A NUMBER OF SPECTRAL ENVELOPES 审中-公开
标题翻译：一种用于计算多个光谱包络的装置和方法
公开(公告)号：WO2010003546A3
公开(公告)日：2010-03-04
申请号：PCT/EP2009004523
申请日：2009-06-23
申请人： FRAUNHOFER GES FORSCHUNG , NEUENDORF MAX , GRILL BERNHARD , KRAEMER ULRICH , MULTRUS MARKUS , POPP HARALD , RETTELBACH NIKOLAUS , NAGEL FREDERIK , LOHWASSER MARKUS , GAYER MARC , JANDER MANUEL , BACIGALUPO VIRGILIO
发明人： NEUENDORF MAX , GRILL BERNHARD , KRAEMER ULRICH , MULTRUS MARKUS , POPP HARALD , RETTELBACH NIKOLAUS , NAGEL FREDERIK , LOHWASSER MARKUS , GAYER MARC , JANDER MANUEL , BACIGALUPO VIRGILIO
IPC分类号： G10L21/02 , G10L19/02 , G10L19/14
CPC分类号： G10L21/038 , G10L19/0208 , G10L19/025 , G10L19/20
摘要： An apparatus (100) calculates a number (102) of spectral envelopes (104) to be derived by a spectral band replication (SBR) encoder, wherein the SBR encoder is adapted to encode an audio signal (105) using a plurality of sample values within a predetermined number of subsequent time portions (110) in an SBR frame extending from an initial time (t0) to a final time (tn), the predetermined number of subsequent time portions (110) being arranged in a time sequence given by the audio signal (105). The apparatus (100) comprises a decision value calculator (120) for determining a decision value (125), the decision value (125) measuring a deviation in spectral energy distributions of a pair of neighboring time portions. The apparatus (100) further comprises a detector (130) for detecting a violation (135) of a threshold by the decision value (125) and a processor (140) for determining a first envelope border (145) between the pair of neighboring time portions when the violation (135) of the threshold is detected. The apparatus (100) further comprises a processor (150) for determining a second envelope border (155) between a different pair of neighboring time portions or at the initial time (t0) or at the final time (tn) for an envelope having the first envelope border (145) based on the violation (135) of the threshold for the other pair or based on a temporal position of the pair or the different pair in the SBR frame. The apparatus (100) further comprises a number processor (160) for establishing the number (102) of spectral envelopes (104) having the first envelope border (145) and the second envelope border (155).
摘要翻译：一种装置（100）计算由谱带复制（SBR）编码器导出的频谱包络（104）的数目（102），其中SBR编码器适于使用多个采样值对音频信号（105）进行编码在从初始时间（t0）延伸到最后时间（tn）的SBR帧中的预定数量的后续时间部分（110）中，预定数量的后续时间部分（110）按照由音频信号（105）。装置（100）包括用于确定判定值（125）的判定值计算器（120），所述判定值（125）测量一对相邻时间部分的频谱能量分布的偏差。所述设备（100）还包括检测器（130），用于通过所述判定值（125）检测阈值的违规（135）;以及处理器（140），用于确定所述一对相邻时间之间的第一包络边界（145）当检测到阈值的违规（135）时的部分。所述装置（100）还包括处理器（150），用于确定不同对相邻时间部分之间的第二信封边界（155），或者在具有所述相邻时间部分的信封的初始时间（t0）或最后时间（tn）基于另一对的阈值的违规（135）或者基于SBR帧中的对或不同对的时间位置的第一包络边界（145）。所述设备（100）还包括用于建立具有所述第一信封边界（145）和所述第二信封边界（155）的频谱包络（104）的数量（102）的数字处理器（160）。

5. 发明申请

WO2008046468A3 ANALYSIS FILTERBANK, SYNTHESIS FILTERBANK, ENCODER, DECODER, MIXER AND CONFERENCING SYSTEM 审中-公开
标题翻译：分析滤波器，合成滤波器，编码器，解码器，混频器和会议系统
公开(公告)号：WO2008046468A3
公开(公告)日：2008-06-26
申请号：PCT/EP2007007553
申请日：2007-08-29
申请人： FRAUNHOFER GES FORSCHUNG , GRILL BERNHARD , SCHNELL MARKUS , GEIGER RALF , SCHULLER GERHARD
发明人： GRILL BERNHARD , SCHNELL MARKUS , GEIGER RALF , SCHULLER GERHARD
IPC分类号： G10L19/02
CPC分类号： G10L19/135 , G10L19/0212 , G10L19/022
摘要： An embodiment of an analysis filterbank for filtering a plurality of time domain input frames, wherein an input frame comprises a number of ordered input samples, comprises a windower configured to generating a plurality of windowed frames, wherein a windowed frame comprises a plurality of windowed samples, wherein the windower is configured to process the plurality of input frames in an overlapping manner using a sample advance value, wherein the sample advance value is less than the number of ordered input samples of an input frame divided by two, and a time/frequency converter configured to providing an output frame comprising a number of output values, wherein an output frame is a spectral representation of a windowed frame.
摘要翻译：一种用于对多个时域输入帧进行滤波的分析滤波器组的实施例，其中输入帧包括多个有序输入采样，包括被配置为产生多个窗口化帧的加窗器，其中，窗口框架包括多个窗口样本其中，所述加权器被配置为使用样本提前值以重叠的方式处理所述多个输入帧，其中所述样本提前值小于输入帧除以2的有序输入样本的数量，并且时间/频率转换器，被配置为提供包括多个输出值的输出帧，其中输出帧是窗口化帧的频谱表示。

6. 发明申请

WO2005083681A8 DEVICE AND METHOD FOR DETERMINING A QUANTISER STEP SIZE 审中-公开
标题翻译：设备和方法确定量化步长
公开(公告)号：WO2005083681A8
公开(公告)日：2008-03-27
申请号：PCT/EP2005001652
申请日：2005-02-17
申请人： FRAUNHOFER GES FORSCHUNG , GRILL BERNHARD , SCHUG MICHAEL , TEICHMANN BODO , RETTELBACH NIKOLAUS
发明人： GRILL BERNHARD , SCHUG MICHAEL , TEICHMANN BODO , RETTELBACH NIKOLAUS
IPC分类号： G10L19/032
CPC分类号： G10L19/032
摘要： In order to determine a quantiser step size for quantising a signal comprising audio or video information, a first quantiser step size and an interference threshold are supplied (502). According to the invention, the actual interference introduced by means of the first quantizer step size is determined (504) and compared with the interference threshold (506). Even if the comparison indicates that the actually introduced interference is higher than the threshold, a second coarser quantizer step size is used (508), that is then used for the quantisation (514) if it emerges that the interference introduced by the coarser second quantizer step size is lower than the threshold or the interference introduced by the first quantiser step size (512). In this way, the quantisation interference is reduced during the coarsening of the quantisation and thus during an increase in the compression gain.
摘要翻译：具有用于确定用于量化的信号时，音频或视频信息，第一量化器步长和干扰阈值被传递（502）一个量化器步长。然后由第一量化器步长实际故障被确定（504）引入，并与故障阈值进行比较（506）是。尽管比较结果显示引入的实际干扰大于阈值，但第二较粗量化器步长被使用（508），然后将其用于量化（514），如果结果是由引入的第二较粗糙的量化器步长干扰比由第一量化器步长障碍（512）引入的阈值或更小。这将减少量化在量化的粗大化，从而导致增加的Komprimiergewinns。

7. 发明申请

WO9922451A3 METHODS AND DEVICES FOR ENCODING AUDIO SIGNALS AND METHODS AND DEVICES FOR DECODING A BIT STREAM 审中-公开
标题翻译：用于解码比特流的方法和设备，用于编码音频信号的方法和装置
公开(公告)号：WO9922451A3
公开(公告)日：1999-07-29
申请号：PCT/EP9804200
申请日：1998-07-07
申请人： FRAUNHOFER GES FORSCHUNG , GRILL BERNHARD , HERRE JUERGEN , TEICHMANN BODO , BRANDENBURG KARLHEINZ , GERHAEUSER HEINZ
发明人： GRILL BERNHARD , HERRE JUERGEN , TEICHMANN BODO , BRANDENBURG KARLHEINZ , GERHAEUSER HEINZ
IPC分类号： G10L19/02 , G10L19/00 , H03H17/00 , H03M7/30 , H04B1/66 , H04B14/04
CPC分类号： H04B1/665 , H04B14/046
摘要： The invention makes it possible to combine a scaleable audio coder with TNS technology. According to the inventive method for encoding time signals (x1) sampled in a first sampling rate, second time signals (x2) with a sampling rate smaller than the first sampling rate are generated (12). The second time signals (x2) are then encoded (14) according to a first coding algorithm, and written into a bit stream (xAUS) (16). The encoded second time signals (x2c) are then decoded (14) again and are transformed (23, 24) into the frequency range, as are the first time signals. TNS prediction coefficients are then calculated (25) from a spectral representation of the first time signals (X1). The transformed output signal (X2cd) of the coder/decoder (14) with the first coding algorithm and the spectral representation (X1) of the first time signal are subjected to a prediction of the frequency (27) in order to obtain spectral residual values for both signals using the prediction coefficients calculated on the basis of the first time signals alone. These two signals are evaluated against each other (26, 28). The evaluated spectral residual values (Xb) are then encoded by means of a second coding algorithm in order to obtain coded evaluated spectral residual values (Xcb). These evaluated spectral residual values are written into the bit stream (xAUS) in addition to side information with the prediction coefficients.
摘要翻译：本发明允许与TNS技术可扩展的Audiocodieres的组合。在用于在第一采样时间的信号（X1）取样编码的方法是第一第二时间信号（×2）产生（12），其采样速率为小于所述第一采样率。现在，在根据第一编码算法的第二次信号（×2）进行编码（14），并在比特流（XOFF）写入（16）。编码的第二时间信号（X2C），但是，再次解码（14）和就像变换到频率范围（23，24）在第一时间信号。从第一时间信号（X1）的频谱表示是计算（25）TNS预测系数。所述变换后的输出信号（X2CD）编码器/解码器Dieres（14）与所述第一编码算法，如进行的预测在频率的第一时间信号的频谱表示（X1）（27）以获得两个信号，频谱残余值的其中仅由于用于计算预测系数的第一次信号。这两个信号相对于彼此（26，28）进行评价。所评估的残余频谱值（XB）至由第二编码算法（30），以获得编码的评价的残余频谱值（XCB）具有所计算的预测系数的相邻页的信息，也是在比特流（XOFF）写入随后进行编码。

8. 发明申请

WO2005013491A3 AUDIO FILE FORMAT CONVERSION 审中-公开
标题翻译：音频文件格式转换
公开(公告)号：WO2005013491A3
公开(公告)日：2005-03-24
申请号：PCT/EP2004007744
申请日：2004-07-13
申请人： FRAUNHOFER GES FORSCHUNG , GEYERSBERGER STEFAN , GERNHARDT HARALD , GRILL BERNHARD , HAERTL MICHAEL , HILPERT JOHANN , LUTZKY MANFRED , WEISHART MARTIN , POPP HARALD
发明人： GEYERSBERGER STEFAN , GERNHARDT HARALD , GRILL BERNHARD , HAERTL MICHAEL , HILPERT JOHANN , LUTZKY MANFRED , WEISHART MARTIN , POPP HARALD
IPC分类号： G10L19/16 , G10L19/14 , G11B20/10 , G11B20/12 , H04L29/06
CPC分类号： G10L19/173
摘要： According to the invention, the manipulation of audio data can be simplified, such as, for example, with relation to the combination of individual audio channels to give multi-channel audio data streams, or for the general manipulation of an audio data stream, whereby a data block is modified (56) in an audio data stream (10), divided into data blocks (10a, 10b) with determining blocks (14, 16) and data block audio data (18) such as, for example, by inclusion in, addition to, or replacement of a part thereof, itself containing a length indicator which expresses a data amount or length of the block audio data, or a data amount or length of the data block, such as to give a second audio data stream with modified data blocks. Alternatively, an audio data stream (10) with pointers in determining blocks (14, 10), which point to the determining block audio data (44, 46), allocated to the determining blocks, but distributed in various data blocks, is converted into an audio stream, whereby the determining block audio data (44, 46) are combined to give coherent determining block audio data (48). The coherent determining block audio data (48) can be contained with the corresponding determining block (14, 16) in a self-contained channel element (52a).
摘要翻译：音频数据的处理可变得容易，例如一般对于各个音频数据的组合流提供给多通道音频数据流或通过在音频数据流（10）为数据块处理的音频数据流（10A，10B）与判定块（14，16）和数据块的音频数据（18），被构造，一个修改后的数据块（56），如它们通过添加或添加或通过替换部分，以使相同长度指示符包含指示数据块的数据量或长度是音频数据或数据量或长度desDatenblocks以获得第二音频数据流与修改的数据块。或者，它是具有指针的音频数据流（10）在形成于指派但分布在不同的数据块确定块的音频数据（44，46）被转移到的音频数据流的判定块判定块（14，10），其中，所述确定块的音频数据（44，46 ）zuzusammenhängenden确定块的音频数据（48）进行了总结。连续测定块的音频数据（48）然后可以用他们的确定块（14，16）一起可以包括在一个本身完成了信道构件（52A）。

9. 发明申请

WO9910886A3 METHOD AND DEVICE FOR DETECTING A TRANSIENT IN A DISCRETE-TIME AUDIOSIGNAL 审中-公开
标题翻译：方法和装置用于记录攻击在时间离散音频信号
公开(公告)号：WO9910886A3
公开(公告)日：1999-06-10
申请号：PCT/EP9803603
申请日：1998-06-15
申请人： FRAUNHOFER GES FORSCHUNG , HILPERT JOHANNES , HERRE JUERGEN , GRILL BERNHARD , BUCHTA RAINER , BRANDENBURG KARLHEINZ , GERHAEUSER HEINZ
发明人： HILPERT JOHANNES , HERRE JUERGEN , GRILL BERNHARD , BUCHTA RAINER , BRANDENBURG KARLHEINZ , GERHAEUSER HEINZ
IPC分类号： H04B1/66
CPC分类号： H04B1/665
摘要： The invention relates to a method for detecting a transient in a discrete-time audiosignal (x(k)) which is carried out entirely in the time domain. Said method comprises a step in which the discrete-time audiosignal is segmented so as generate consecutive segments of identical length with unfiltered discrete-time audiosignals (xs(T), xs(T-1), xs(T-2), ...), after which the discrete-time audiosignal (xs(T)) in a current segment is filtered. Thereafter there are two options: either the energy (Ef(T)) of the filtered discrete-time audiosignal (Ys(T)) in the current segment can be compared with the energy (Ef(T-1)) of the filtered discrete-time audiosignal (Ys(T-1)) in a preceding segment, or a current relationship can be generated between the energy (Ef(T)) of the filtered discrete-time audiosignal (Ys(T)) in the current segment and the energy (Eu(T)) of the unfiltered discrete-time audiosignal (Xs(T)) in the current segment and said current relationship compared with a corresponding preceding relationship. On the basis of the one comparison and/or the other comparison it is determined whether a transient is present in the discrete-time audiosignal.
摘要翻译：在离散时间检测音频信号中的止挡（X（k））的一种方法，在时域中完全进行，并且包括分割所述离散时间的音频信号以与未滤波的离散时间的音频信号（XS（T），XS相同长度的连续片段的步骤（T 生产1），XS（T-2）...）。然后在当前段离散时间的音频信号（XS（T））进行过滤。现在，无论是在与能量当前段的能量滤波的离散时间的音频信号的（EF（T））（YS（T））（EF（T-1））在经滤波的离散时间的音频信号（YS（T-1））的先前片段进行比较时，或者它可以是在当前段中的能量滤波的离散时间的音频信号的（EF（T））（YS（T））和能量未滤波的离散时间的音频信号的（EU（T））（XS（之间的电流关系 T））形成在当前段和该电流关系与前面的对应关系进行比较。上的比较和/或其它比较的基础上它检测到停止是否存在于离散时间的音频信号。

10. 发明申请

WO2008089938A3 DEVICE AND METHOD FOR GENERATING A SIGNAL FOR TRANSMISSION OR A DECODED SIGNAL 审中-公开
标题翻译：用于产生要发送的信号或解码信号的装置和方法
公开(公告)号：WO2008089938A3
公开(公告)日：2008-12-18
申请号：PCT/EP2008000423
申请日：2008-01-21
申请人： FRAUNHOFER GES FORSCHUNG , SCHULLER GERALD , WABNIK STEFAN , GRILL BERNHARD , ZINK ALEXANDER
发明人： SCHULLER GERALD , WABNIK STEFAN , GRILL BERNHARD , ZINK ALEXANDER
IPC分类号： H04L1/00 , G08C25/04 , G10L19/16 , H04L1/22 , H04L29/14
CPC分类号： G10L19/008 , G08C19/34 , G10L19/16 , H04L5/0007 , H04L27/2647 , H04L27/3488 , H04L65/607 , H04L2001/0098 , H04N21/23439 , H04N21/2383 , H04N21/4382 , H04N21/44209 , H04N21/631
摘要： According to the invention, original information is coded in a main channel and a sub channel to generate a signal for transmission, the sub channel being more robust with regard to channel effects. On the receiver side, when the reception quality is above a threshold necessary to carry out a successful decoding of the main channel the main channel is reproduced. Should the reception quality fall below said threshold the sub channel is reproduced, which can have fewer bits than the main channel and is hence a correspondingly lower quality representation of the original information than the main channel.
摘要翻译：为了生成要发送的信号，将源信息编码成主信道和子信道，子信道比主信道对信道影响更鲁棒。在接收机侧，如果接收质量高于成功解码主频道所需的阈值，则重放主频道。然而，如果接收质量下降到该阈值以下，则再现次要信道，其可能具有比主要信道更少的比特，并且与原始信道相比原始信息的定性表示相应地较低。

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