公开(公告)号：US5986198A

公开(公告)日：1999-11-16

申请号：US713405

申请日：1996-09-13

申请人： Brian Charles Gibson ,  Christopher Michael Jubien ,  Brian John Roden

发明人： Brian Charles Gibson ,  Christopher Michael Jubien ,  Brian John Roden

IPC分类号： G10H1/043 ,  G10H1/20 ,  G10H3/12 ,  G10H5/00 ,  G10H7/08 ,  G10H7/00

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.

公开(公告)号：US06868162B1

公开(公告)日：2005-03-15

申请号：US09715588

申请日：2000-11-17

申请人： Christopher Michael Jubien ,  Constantine Lakoumentas ,  Brian John Roden ,  Dale John Shpak ,  Jeffrey William Sondermeyer

发明人： Christopher Michael Jubien ,  Constantine Lakoumentas ,  Brian John Roden ,  Dale John Shpak ,  Jeffrey William Sondermeyer

IPC分类号： H03G5/22 ,  H03G3/00

CPC分类号： H03G5/22

摘要： An audio system (100) is provided with improved adaptive filter (206) to automatically adjust signal gain depending on the ambient noise level. The original music signal passes through a normalized adaptive filter (206), and is subtracted from the ambient room signal detected by a microphone (120), resulting in an error signal that is an estimate of the ambient noise. The error signal is used to update a set of adaptation coefficients so that the normalized adaptive filter more accurately simulates the room transfer function, resulting in an better estimate of the ambient noise. The audio system (100) is calibrated automatically upon initial use to determine adaptation coefficients and noise threshold level to prevent runaway gain. System parameters are adjusted using a controller (124) with a user-friendly interface (400).

摘要翻译： 音频系统（100）具有改进的自适应滤波器（206），以根据环境噪声电平自动调整信号增益。 原始音乐信号通过归一化自适应滤波器（206），并从麦克风（120）检测到的环境室信号中减去，导致作为环境噪声估计的误差信号。 误差信号用于更新一组自适应系数，使得归一化自适应滤波器更精确地模拟房间传递函数，导致对环境噪声的更好估计。 音频系统（100）在初次使用时自动校准，以确定适应系数和噪声阈值电平，以防止失控增益。 使用具有用户友好界面（400）的控制器（124）来调整系统参数。

公开(公告)号：US6046395A

公开(公告)日：2000-04-04

申请号：US783643

申请日：1997-01-14

申请人： Brian Charles Gibson ,  Christopher Michael Jubien ,  Brian John Roden

发明人： Brian Charles Gibson ,  Christopher Michael Jubien ,  Brian John Roden

IPC分类号： G10H1/20 ,  G10H1/36 ,  G10H3/12 ,  G10H7/00

CPC分类号： G10H1/20 ,  G10H1/366 ,  G10H3/125 ,  G10H2240/311 ,  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。