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公开(公告)号：US5567901A
公开(公告)日：1996-10-22
申请号：US374110
申请日：1995-01-18
CPC分类号： G10H3/125 , G10H1/20 , G10H5/005 , G10H7/08 , G10H2210/066 , G10H2240/056 , G10H2250/285 , G10H2250/631
摘要： A method for shifting the timbre and/or pitch of an input signal samples the input signal at a first rate and stores the samples in a memory buffer. A digital signal processor resamples the stored input signal at a rate that differs from the first rate at which the input note is originally sampled and stores the resampled input signal in a second memory buffer. A pitch shifter shifts the pitch of the input signal by periodically scaling the resampled input signal by a window function to create an output signal. The rate at which the resampled data is replicated by the window function determines the pitch of the output signal.
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2.发明授权Method and apparatus for changing the timbre and/or pitch of audio signals 失效用于改变音频信号的音色和/或音调的方法和装置
公开(公告)号：US5641926A
公开(公告)日：1997-06-24
申请号：US720447
申请日：1996-09-30
CPC分类号： G10H3/125 , G10H1/20 , G10H5/005 , G10H7/08 , G10H2210/066 , G10H2240/056 , G10H2250/285 , G10H2250/631
摘要： A method for shifting the timbre and/or pitch of an input signal samples the input signal at a first rate and stores the samples in a memory buffer. A digital signal processor resamples the stored input signal at a rate that differs from the first rate at which the input note is originally sampled and stores the resampled input signal in a second memory buffer. A pitch shifter shifts the pitch of the input signal by periodically scaling the resampled input signal by a window function to create an output signal. The rate at which the resampled data is replicated by the window function determines the pitch of the output signal.
摘要翻译： 用于移位输入信号的音色和/或音调的方法以第一速率对输入信号进行采样，并将采样存储在存储器缓冲器中。 数字信号处理器以与初始采样输入音符的第一速率不同的速率重新采样存储的输入信号，并将再采样的输入信号存储在第二存储器缓冲器中。 音调移位器通过用窗函数周期性地缩放重新采样的输入信号来移动输入信号的音调，以产生输出信号。 通过窗口函数复制采样数据的速率决定了输出信号的间距。
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公开(公告)号：US5428708A
公开(公告)日：1995-06-27
申请号：US848035
申请日：1992-03-09
申请人： Brian C. Gibson , John P. Bertsch
发明人： Brian C. Gibson , John P. Bertsch
CPC分类号： G10G7/02 , G10H1/366 , G10H5/005 , G10H2210/251 , G10H2220/011 , G10H2250/031 , G10H2250/285 , G10H2250/631
摘要： A karaoke type system allows a participant to sing on key with a prerecorded song. A microphone produces an input signal that corresponds to a singer's voice, and a pitch corrector samples the input vocal signal and determines its pitch. The pitch corrector reads a series of codes that are stored with the prerecorded song that indicates the pitch at which the input vocal signal is to be sung in order to be on key with the prerecorded song. The pitch corrector shifts the pitch of the input vocal signal to be on key.
摘要翻译： 卡拉OK系统允许参与者使用预先录制的歌曲进行唱歌。 麦克风产生对应于歌手的声音的输入信号，并且音调校正器对输入声音信号进行采样并确定其音调。 音调校正器读取一系列与预先录制的歌曲一起存储的代码，该歌曲指示要输入的声乐信号将被播放的音调，以便用预先录制的歌曲进行关键。 音调校正器将输入声音信号的音调移动到键上。
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公开(公告)号：US5301259A
公开(公告)日：1994-04-05
申请号：US34526
申请日：1993-03-22
申请人： Brian C. Gibson , John P. Bertsch
发明人： Brian C. Gibson , John P. Bertsch
CPC分类号： G10H1/366 , G10G7/02 , G10H5/005 , G10H2210/251 , G10H2220/011 , G10H2250/031 , G10H2250/285 , G10H2250/631
摘要： Disclosed are a method and apparatus for analyzing an input vocal signal to produce a plurality of harmony signals that are combined with the input vocal signal to produce a multivoice signal. The method makes a current estimate of the fundamental frequency of the input vocal signal and determines if the current estimate is the correct estimate of the fundamental frequency. If the current estimate is correct, a reference note is assigned to correspond to the current estimate and a plurality of harmony notes are selected to correspond to the reference note. The method then generates a plurality of harmony signals by scaling the input vocal signal with a piecewise linear approximation of a Hanning window to extract a portion of the input vocal signal and by replicating the extracted portion at a plurality of rates equal to the fundamental frequencies of each of the harmony notes. The plurality of harmony signals and the input vocal signal are combined to produce the multivoice signal. The steps of the method are carried out with a microprocessor and a signal processing circuit.
摘要翻译： 公开了一种用于分析输入声音信号以产生与输入声音信号组合以产生多声道信号的多个和声信号的方法和装置。 该方法对输入声音信号的基频进行当前估计，并确定当前估计值是否是基频的正确估计。 如果当前估计是正确的，则分配参考音符以对应于当前估计，并且选择多个和声笔记以对应于参考音符。 然后，该方法通过用Hanning窗口的分段线性近似缩放输入声音信号来产生多个和声信号，以提取输入声音信号的一部分，并且通过以等于基本频率的多个速率复制提取的部分 每个和声笔记。 多个和声信号和输入声信号被组合以产生多声道信号。 该方法的步骤用微处理器和信号处理电路进行。
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公开(公告)号：US4688464A
公开(公告)日：1987-08-25
申请号：US820756
申请日：1986-01-16
申请人： Brian C. Gibson , George J. Spark
发明人： Brian C. Gibson , George J. Spark
CPC分类号： G10G7/02
摘要： A pitch detector is disclosed that automatically recognizes the pitch of musical notes quickly and outputs the pitch information in a variety of formats. The detector employs a microprocessor that samples the signal from a musical instrument or voice at regular intervals using an analog-to-digital converter and then utilizes both amplitude and time information from the waveform to determine the fundamental period of the note, while rejecting the harmonic components. The microprocessor analyzes the waveform looking for peaks that are approximately equal in amplitude separated by opposite polarity peaks. The time intervals between the peaks must be approximately equal too. Timing information is measured using more than one point on the waveform to avoid inaccuracies caused by temporary distortions of the waveform. The timing points are chosen at points where the slope of the waveform is high for substantially optimal accuracy. To filter out erroneous readings caused by pitch detection during note transition or noise, additional processing of the data is performed to cause a second corroborating reading to be taken when a note transition that is uncommon musically is detected.
摘要翻译： 公开了一种自动识别音符音调并且以各种格式输出音调信息的音调检测器。 检测器采用微处理器，使用模拟 - 数字转换器以规律的间隔对来自乐器或声音的信号进行采样，然后利用来自波形的幅度和时间信息来确定音符的基本周期，同时拒绝谐波 组件。 微处理器分析波形，寻找大致相等的振幅，由相反极性峰分开。 峰值之间的时间间隔也必须近似相等。 使用波形上的多个点测量定时信息，以避免由波形的暂时失真引起的不准确。 定时点在波形斜率高的点上进行选择，以达到最佳精度。 为了滤除在音符转换或噪声期间由音调检测引起的错误读数，执行数据的附加处理，以便在检测到不常见的音符转换时，进行第二个确认读数。
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公开(公告)号：US5231671A
公开(公告)日：1993-07-27
申请号：US719195
申请日：1991-06-21
申请人： Brian C. Gibson , John P. Bertsch
发明人： Brian C. Gibson , John P. Bertsch
CPC分类号： G10H1/366 , G10G7/02 , G10H5/005 , G10H2210/251 , G10H2220/011 , G10H2250/031 , G10H2250/285 , G10H2250/631
摘要： Disclosed are a method and apparatus for analyzing an input vocal signal to produce a plurality of harmony signals that are combined with the input vocal signal to produce a multivoice signal. The method makes a current estimate of the fundamental frequency of the input vocal signal and determines if the current estimate is the correct estimate of the fundamental frequency. If the current estimate is correct, a reference note is assigned to correspond to the current estimate and a plurality of harmony notes are selected to correspond to the reference note. The method then generates a plurality of harmony signals by scaling the input vocal signal with a piecewise linear approximation of a Hanning window to extract a portion of the input vocal signal and by replicating the extracted portion at a plurality of rates equal to the fundamental frequencies of each of the harmony notes. The plurality of harmony signals and the input vocal signal are combined to produce the multivoice signal. The steps of the method are carried out with a microprocessor and a signal processing circuit.
摘要翻译： 公开了一种用于分析输入声音信号以产生与输入声音信号组合以产生多声道信号的多个和声信号的方法和装置。 该方法对输入声音信号的基频进行当前估计，并确定当前估计值是否是基频的正确估计。 如果当前估计是正确的，则分配参考音符以对应于当前估计，并且选择多个和声笔记以对应于参考音符。 然后，该方法通过用Hanning窗口的分段线性近似缩放输入声音信号来产生多个和声信号，以提取输入声音信号的一部分，并且通过以等于基本频率的多个速率复制提取的部分 每个和声笔记。 多个和声信号和输入声信号被组合以产生多声道信号。 该方法的步骤用微处理器和信号处理电路进行。
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