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21. 发明授权

US07319959B1 Multi-source phoneme classification for noise-robust automatic speech recognition 有权
标题翻译：用于噪声鲁棒自动语音识别的多源音素分类
公开(公告)号：US07319959B1
公开(公告)日：2008-01-15
申请号：US10439284
申请日：2003-05-14
申请人： Lloyd Watts
发明人： Lloyd Watts
IPC分类号： G10L15/02
CPC分类号： G10L15/02 , G10L15/142 , G10L15/16 , G10L15/20 , G10L25/18 , G10L2015/025
摘要： A system and method are disclosed for processing an audio signal including separating the audio signal into a plurality of streams which group sounds from a same source prior to classification and analyzing each separate stream to determine phoneme-level classification. One or more words of the audio signal may then be outputted.
摘要翻译：公开了一种用于处理音频信号的系统和方法，包括将音频信号分离成多个流，其在分类之前对来自相同源的声音进行分组并分析每个单独的流以确定音素级分类。然后可以输出音频信号的一个或多个字。

22. 发明授权

US07076315B1 Efficient computation of log-frequency-scale digital filter cascade 失效
标题翻译：对数倍频数字滤波器级联的高效计算
公开(公告)号：US07076315B1
公开(公告)日：2006-07-11
申请号：US09534682
申请日：2000-03-24
申请人： Lloyd Watts
发明人： Lloyd Watts
IPC分类号： G06F17/00 , H04R25/00
CPC分类号： H04R7/08
摘要： A system for processing audio signals comprises a sequence of digital filters each configured to process a selected frequency using a set of coefficients. A filter configured to process a certain frequency shares its coefficients with another filter that processes a frequency that is lower than the first frequency by at least one frequency interval, such as an octave. The first filter samples at a certain sampling rate, and the second filter's sampling rate is determined by multiplying the first sampling rate by the ratio of the second frequency to the first frequency. The filters are evenly grouped into frequency intervals, such as octaves. Filters in an octave are sampled at a sampling frequency that is at least twice as high as the highest frequency processed in that octave.
摘要翻译：用于处理音频信号的系统包括每个被配置为使用一组系数来处理选定频率的数字滤波器序列。被配置为处理特定频率的滤波器与另一个滤波器共享其系数，该滤波器处理低于第一频率的频率至少一个频率间隔（例如八度）。第一滤波器以一定的采样速率采样，第二滤波器的采样率通过将第一采样率乘以第二频率与第一频率的比来确定。滤波器被均匀地分组成频率间隔，例如八度。八度音阶中的滤波器采样频率至少是在该倍频程中处理的最高频率的两倍。

23. 发明申请

US20050216259A1 Filter set for frequency analysis 审中-公开
标题翻译：滤波器组用于频率分析
公开(公告)号：US20050216259A1
公开(公告)日：2005-09-29
申请号：US10613224
申请日：2003-07-03
申请人： Lloyd Watts
发明人： Lloyd Watts
IPC分类号： H03H17/02 , H03H17/04 , G10L19/14
CPC分类号： H03H17/02 , G10L25/18 , H03H17/04
摘要： A system and method are disclosed for analyzing an input signal into a plurality of frequency components. In one embodiment, the input signal is processed with a first set of low pass filters to derive a first set of frequency components wherein the first set of low pass filters are arranged serially in a chain having a first low pass filter and a last low pass filter, the output of each low pass filter being fed to the next low pass filter in the chain until the last low pass filter. The output of the last low pass filter is downsampled to produce a downsampled signal. The downsampled signal is processed with a second set of low pass filters to derive a second set of frequency components.
摘要翻译：公开了一种用于将输入信号分解为多个频率分量的系统和方法。在一个实施例中，输入信号用第一组低通滤波器处理以导出第一组频率分量，其中第一组低通滤波器串联布置在具有第一低通滤波器和最后低通滤波器的链中滤波器，每个低通滤波器的输出被馈送到链中的下一个低通滤波器，直到最后一个低通滤波器。最后一个低通滤波器的输出被下采样以产生下采样信号。下采样信号用第二组低通滤波器处理以导出第二组频率分量。

24. 发明授权

US4963034A Low-delay vector backward predictive coding of speech 失效
标题翻译：语音的低延迟向量反向预测编码
公开(公告)号：US4963034A
公开(公告)日：1990-10-16
申请号：US360023
申请日：1989-06-01
申请人： Vladimir M. Cuperman , Robert Pettigrew , Lloyd Watts
发明人： Vladimir M. Cuperman , Robert Pettigrew , Lloyd Watts
IPC分类号： G10L19/00 , G10L19/12
CPC分类号： G10L19/12 , G10L25/06
摘要： A method of encoding speech sounds to facilitate their transmission to and reconstruction at a remote receiver. A transmitter and a receiver have identical filters and identical codebooks containing prestored excitation vectors which model quantized speech sound vectors. The speech sound vectors are compared with filtered versions of the codebook vectors. The filtered vector closest to each speech sound vector is selected. During the comparison, filtration parameters derived by backward predictive analysis of a series of previously selected filtered codebook vectors are applied to the filter. The transmitter sends the receiver an index representative of the location of the selected vector within the codebook. The receiver uses the index to recover the selected vector from its codebook, and passes the recovered vector through its filter to yield an output signal which reproduces the original speech sound sample. By applying the same backward predictive analysis technique employed by the transmitter to the same series of previously selected filtered codebook vectors to which the transmitter applied the technique, the receiver derives the same combination of filtration parameters which the transmitter applied to its filter while selecting the codebook vector corresponding to the transmitted index.
摘要翻译：编码语音的方法，以便于它们在远程接收机处的传输和重构。发射机和接收机具有相同的滤波器和相同的代码簿，其包含对量化语音声矢量进行建模的预存的激励矢量。语音声音矢量与码本矢量的滤波版本进行比较。选择最接近每个语音声矢量的滤波矢量。在比较期间，通过一系列先前选择的滤波码本向量的反向预测分析得到的滤波参数被应用于滤波器。发射机向接收机发送代表所选向量在码本内的位置的索引。接收机使用索引从其码本中恢复所选择的向量，并将恢复的向量通过其滤波器，以产生再现原始语音声音样本的输出信号。通过将发射机使用的相同的后向预测分析技术应用于发射机应用该技术的相同系列先前选择的滤波码本向量，接收机导出与发射机应用于其滤波器的滤波参数相同的组合，同时选择码本向量对应于传输的索引。

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