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    • 4. 发明授权
    • Speech coding system and method including spectral quantizer
    • 语音编码系统及方法包括频谱量化器
    • US6094629A
    • 2000-07-25
    • US114659
    • 1998-07-13
    • Mark Lewis GrabbSteven Robert KochGlen William BrooksbyRichard Louis Zinser, Jr.
    • Mark Lewis GrabbSteven Robert KochGlen William BrooksbyRichard Louis Zinser, Jr.
    • G10L19/06
    • G10L19/07
    • A speech coding system and associated method relies on a speech encoder and a speech decoder. The encoder includes a spectral quantizer for computing line spectral frequencies (LSFs) for respective frames of speech and for quantizing the LSFs to obtain a minimum bit representation of a spectral envelope of each respective frame of speech. For even numbered frames of speech the LSFs are quantized using a vector quantization technique. For odd numbered frames of speech samples the LSFs are quantized using a dynamic bit allocation (DBA) method. The dynamic bit allocation method determines an interpolation factor for interpolating between the LSFs of the previous and next frames. According to the dynamic bit allocation method the most perceptually important LSFs are represented by relatively more bits, while the least perceptually important LSFs are represented by relatively fewer bits. The system and associated method thereby reduces an overall bit rate required to represent, transmit or store the speech samples.
    • 语音编码系统和相关方法依赖于语音编码器和语音解码器。 编码器包括用于计算各个语音帧的频谱频率(LSF)的频谱量化器,并用于量化LSF以获得每个相应的语音帧的频谱包络的​​最小比特表示。 对于甚至编号的语音帧,使用矢量量化技术对LSF进行量化。 对于奇数帧的语音采样,使用动态位分配(DBA)方法对LSF进行量化。 动态位分配方法确定用于在前一帧和下一帧的LSF之间进行插值的内插因子。 根据动态位分配方法,最感知重要的LSF由相对较多的比特表示,而最不感知重要的LSF由相对较少的比特表示。 因此,系统和相关联的方法减少了表示,发送或存储语音样本所需的总比特率。
    • 6. 发明授权
    • Speech coding system and method including voicing cut off frequency
analyzer
    • 语音编码系统及方法,包括语音切断频率分析仪
    • US6078880A
    • 2000-06-20
    • US114660
    • 1998-07-13
    • Richard Louis Zinser, Jr.Mark Lewis GrabbSteven Robert KochGlen William Brooksby
    • Richard Louis Zinser, Jr.Mark Lewis GrabbSteven Robert KochGlen William Brooksby
    • G10L25/93G10L11/06
    • G10L25/93G10L2025/937
    • A speech coding system and associated method relies on a speech encoder (15) and a speech decoder (20). The speech encoder (15) includes a voicing cut off frequency analyzer (60). Voicing cut off frequency analyzer (60) includes voicing cut off frequency estimator (61) and voicing cut off frequency quantizer (62). Voicing cut off frequency estimator (61) estimates a voicing cut off frequency value for respective samples of an input speech waveform (1). To accomplish this, voicing cut off frequency estimator (61) utilizes a bandpass filter to estimate a frequency above which a sample of speech is voiced and below which the sample of speech is unvoiced. Voicing cut off frequency quantizer (62) quantizes the estimated voicing cut off frequency value and provides, for respective samples, a voicing cut off frequency index signal (6) which may be stored or transmitted. Voicing cut off frequency index signal (6) may comprise as few as 1 bit, and in a preferred embodiment, as few as 3 bits.
    • 语音编码系统和相关方法依赖于语音编码器(15)和语音解码器(20)。 语音编码器(15)包括语音切断频率分析器(60)。 声音切断频率分析器(60)包括发声切断频率估计器(61)和发声切断频率量化器(62)。 声音截止频率估计器(61)估计输入语音波形(1)的各样本的声音截止频率值。 为了实现这一点,发声截止频率估计器(61)利用带通滤波器来估计一个频率,在该频率上,语音样本被发声,并且低于该频率的语音样本是清音的。 声音截止频率量化器(62)量化估计的声音截止频率值,并为各个采样提供可存储或发送的发声切断频率指标信号(6)。 切断频率索引信号(6)可以包括少至1位,并且在优选实施例中,少至3位。
    • 8. 发明授权
    • Channel decoder using vocoder joint statistics
    • 频道解码器使用声码器联合统计
    • US06393072B1
    • 2002-05-21
    • US09340102
    • 1999-06-25
    • John Anderson Fergus RossNick Andrew Van StralenMark Lewis GrabbSteven Robert KochRichard Louis Zinser, Jr.John Bailey Anderson
    • John Anderson Fergus RossNick Andrew Van StralenMark Lewis GrabbSteven Robert KochRichard Louis Zinser, Jr.John Bailey Anderson
    • H04L2706
    • H04L1/0047H04L25/061H04L25/067
    • A method for decoding (voice)data where the data is encoded by a finite-state data encoder (216) for transmission over a data channel (18), includes the step of procuring a table of joint statistics representing the probability of occurrence, in a frame of source data of each of the bits of the frame. The joint statistics may be determined ahead of time. The method includes the step of calculating intermediate gamma signals in response to the decoded data of the preceding frame and the joint statistics. The joint statistics source distribution signals represent the likelihood that, for a given logic level of the preceding bit, the “current” bit takes on a particular state; for uncorrelated bits, this value is 0.5. State probability signals and transition probability signals are generated from the gamma signals. The state probability and transition probability signals are processed to produce bit probability signals indicative of the probability that the current bit is in a given state, from which hard bit decisions can be made.
    • 一种用于解码(语音)数据的方法,其中数据由有限状态数据编码器(216)编码,用于通过数据信道(18)进行传输,包括以下步骤:采购表示发生概率的联合统计表, 帧的每个比特的源数据帧。 联合统计可以提前确定。 该方法包括响应于前一帧的解码数据和联合统计来计算中间伽马信号的步骤。 联合统计源分布信号表示对于前一比特的给定逻辑电平,“当前”比特处于特定状态的可能性; 对于不相关的位,此值为0.5。 从伽马信号产生状态概率信号和转移概率信号。 处理状态概率和转移概率信号以产生指示当前比特处于给定状态的概率的比特概率信号,从中可以进行硬比特决定。