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    • 4. 发明授权
    • Wavetable audio synthesizer with low frequency oscillators for tremolo
and vibrato effects
    • 具有低频振荡器的波音音频合成器,用于颤音和颤音效果
    • US5668338A
    • 1997-09-16
    • US333564
    • 1994-11-02
    • Larry D. HewittDavid N. SuggsDavid Norris
    • Larry D. HewittDavid N. SuggsDavid Norris
    • G06F3/16G10H1/00G10H1/12G10H7/00H03K23/68G10H1/02
    • H03K23/68G06F3/162G10H1/0066G10H1/125G10H7/002G10H2230/035G10H2240/311G10H2250/191G10H2250/545G10H2250/571G10H2250/611
    • A digital wavetable audio synthesizer with an LFO generator is described. The synthesizer can generate up to 32 high-quality audio digital signals or voices, including delay-based effects. The synthesizer includes an address generator which has several modes of addressing wavetable data. The address generator's addressing rate controls the pitch of the synthesizer's output signal. A synthesizer volume generator, which has several modes of controlling the volume, adds envelope, right offset, left offset, and effects volume to the data. The synthesizer LFO generator can add LFO variation to: (i) the wavetable data addressing rate, for creating a vibrato effect; and (ii) a voice's volume, for creating a tremolo effect. The LFO generator assigns two triangular-wave LFOs to each of the 32 possible voices. One LFO is dedicated to vibrato (frequency modulation) effects and the other to tremolo (amplitude modulation) effects. It is possible to ramp the depth of each LFO into and out of a programmable maximum. The parameters for each LFO are stored in local memory. When creating delay-based effects, data is stored in one of several effects accumulators. This data is then written to a wavetable. The difference between the wavetable write and read addresses for this data provides a delay for echo and reverb effects. LFO variations can be added to the read address to create chorus and flange effects.
    • 描述了具有LFO发生器的数字波表音频合成器。 合成器可以生成多达32个高质量的音频数字信号或声音,包括基于延迟的效果。 合成器包括地址发生器,其具有寻址波形数据的几种模式。 地址发生器的寻址速率控制合成器输出信号的间距。 合成器音量发生器具有多种控制音量的模式,为数据添加了包络,右偏移,左偏移和效果音量。 合成器LFO发生器可以添加LFO变化:(i)波形数据寻址速率,​​用于产生颤音效果; 和(ii)声音的音量,用于产生颤音效果。 LFO发生器为32个可能的声音中的每一个分配两个三角波LFO。 一个LFO专用于颤音(调频)效果,另一个用于颤音(振幅调制)效果。 可以将每个LFO的深度倾斜到可编程最大值之外。 每个LFO的参数存储在本地存储器中。 当创建基于延迟的效果时,数据存储在几个效果累加器之一中。 然后将此数据写入波表。 该数据的波形写入和读取地址之间的差异提供了回声和混响效应的延迟。 LFO变体可以添加到读取地址以创建合唱和法兰效果。
    • 6. 发明授权
    • Digital wavetable audio synthesizer with delay-based effects processing
    • US6047073A
    • 2000-04-04
    • US334462
    • 1994-11-02
    • David NorrisDavid N. Suggs
    • David NorrisDavid N. Suggs
    • G06F3/16G10H1/00G10H1/12G10H7/00H03K23/68H03G3/00
    • G10H1/0066G06F3/162G10H1/125G10H7/002H03K23/68G10H2230/035G10H2240/311G10H2250/191G10H2250/545G10H2250/605G10H2250/611
    • A digital wavetable audio synthesizer is described. The synthesizer can generate up to 32 high-quality audio digital signals or voices, including delay-based effects, at either a 44.1 KHz sample rate or at sample rates compatible with a prior art wavetable synthesizer. The synthesizer includes an address generator which has several modes of addressing wavetable data. The address generator's addressing rate controls the pitch of the synthesizer's output signal. The synthesizer performs a 10-bit interpolation, using the wavetable data addressed by the address generator, to interpolate additional data samples. When the address generator loops through a block of data, the signal path interpolates between the data at the end and start addresses of the block of data to prevent discontinuities in the generated signal. A synthesizer volume generator, which has several modes of controlling the volume, adds envelope, right offset, left offset, and effects volume to the data. The data can be placed in one of sixteen fixed stereo pan positions, or left and right offsets can be programmed to place the data anywhere in the stereo field. The left and right offset values can also be programmed to control the overall volume. Zipper noise is prevented by controlling the volume increment. A synthesizer LFO generator can add LFO variation to: (i) the wavetable data addressing rate, for creating a vibrato effect; and (ii) a voice's volume, for creating a tremolo effect. Generated data to be output from the synthesizer is stored in left and right accumulators. However, when creating delay-based effects, data is stored in one of several effects accumulators. This data is then written to a wavetable. The difference between the wavetable write and read addresses for this data provides a delay for echo and reverb effects. LFO variations added to the read address create chorus and flange effects. The volume of the delay-based effects data can be attenuated to provide volume decay for an echo effect. After the delay-based effects processing, the data can be provided with left and right offset volume components which determine how much of the effect is heard and its stereo position. The data is then stored in the left and right accumulators.
    • 7. 发明授权
    • Wavetable audio synthesizer with left offset, right offset and effects volume control
    • 具有左偏移,右偏移和效果音量控制的波音音频合成器
    • US07088835B1
    • 2006-08-08
    • US09352659
    • 1999-07-06
    • David NorrisDavid N. Suggs
    • David NorrisDavid N. Suggs
    • H03G3/00
    • H03K23/68G10H1/0066G10H1/125G10H7/002
    • A digital wavetable audio synthesizer is described. A synthesizer volume generator, which has several modes of controlling the volume, adds envelope, right offset, left offset, and effects volume to the data. The data can be placed in one of sixteen fixed stereo pan positions, or left and right offsets can be programmed to place the data anywhere in the stereo field. The left and right offset values can also be programmed to control the overall volume. Zipper noise is prevented by controlling the volume increment. A synthesizer LFO generator can ad LFO variation to: (i) the wavetable data addressing rate, for creating a vibrato effect; and (ii) a voice's volume, for creating a tremolo effect. Generated data to be output from the synthesizer is stored in left and right accumulators. However, when creating delay-based effects, data is stored in one of several effects accumulators. This data is then written to a wavetable. The difference between the wavetable write and read addresses for this data provides a delay for echo and reverb effects. LFO variations added to the read address create a chorus and flange effects. The volume of the delay-based effects data can be attenuated to provide volume decay for an echo effect. After the delay-based effects processing, the data can be provided with left and right offset volume components which determine how much of the effect is heard and its stereo position. The data is then stored in the left and right accumulators.
    • 描述了一种数字波表音频合成器。 合成器音量发生器具有多种控制音量的模式,为数据添加了包络,右偏移,左偏移和效果音量。 数据可以放置在十六个固定立体声平移位置中的一个,也可以编程左右偏移量,将数据放置在立体声场的任何位置。 左右偏移值也可编程为控制总体积。 通过控制音量增量来防止拉链噪音。 合成器LFO发生器可以将LFO变化广播到:(i)波形数据寻址速率,​​用于产生颤音效果; 和(ii)声音的音量,用于产生颤音效果。 从合成器输出的生成数据存储在左和右累加器中。 然而,当创建基于延迟的效果时,数据被存储在几个效果累加器之一中。 然后将此数据写入波表。 该数据的波形写入和读取地址之间的差异提供了回声和混响效应的延迟。 添加到读取地址的LFO变化产生合唱和法兰效果。 可以衰减基于延迟的效果数据的音量,以提供回波效应的体积衰减。 在基于延迟的效果处理之后,可以向左和右偏移音量分量提供数据,以确定听到多少效果及其立体声位置。 然后将数据存储在左侧和右侧的累加器中。
    • 8. 发明授权
    • Wavetable audio synthesizer with multiple volume components and two modes of stereo positioning
    • 具有多音量分量和两种立体声定位模式的波表音频合成器
    • US06246774B1
    • 2001-06-12
    • US08890133
    • 1997-07-09
    • David NorrisDavid N. Suggs
    • David NorrisDavid N. Suggs
    • H03G300
    • H03K23/68G10H1/0066G10H1/125G10H7/002
    • A digital wavetable audio synthesizer including a synthesizer volume generator. The volume generator causing a data sample to be multiplied by volume components that add right offset, left offset, and effects volume to the data. The left and right offsets provide stereo field positioning, and the effects volume is used in generating an echo effect. The data sample can be placed in one of sixteen fixed stereo pan positions, or alternatively the left and right offset values can be programmed to place the data anywhere in the stereo field. The synthesizer includes a register array programmed with right and left offset values for providing wavetable data with right and left offset volume components. The synthesizer also includes a first storage device for storing the right offset value, a second storage device for storing the left offset value, and multiplication circuitry connected to both storage devices for providing wavetable data with right and left offset volume components based on values stored in the first and second storage devices.
    • 一种数字波表音频合成器,包括合成器音量发生器。 音量发生器使数据样本乘以体积分量,向数据添加正确的偏移量,左偏移量和效果音量。 左和右偏移提供立体声场定位,并且效果音量用于产生回声效果。 数据样本可以放置在十六个固定立体声平移位置中的一个,或者可以将左右偏移值编程为将数据放置在立体声场的任何位置。 合成器包括用右和左偏移值编程的寄存器阵列,用于向左和右偏移量分量提供波形数据。 合成器还包括用于存储右偏移值的第一存储装置,用于存储左偏移值的第二存储装置,以及连接到两个存储装置的乘法电路,用于根据存储在存储器中的值提供具有右和左偏移量分量的波形数据 第一和第二存储设备。
    • 10. 发明授权
    • Method and device for acquiring data for diffusion-weighted magnetic resonance imaging
    • 用于获取扩散加权磁共振成像数据的方法和装置
    • US06842000B2
    • 2005-01-11
    • US10468159
    • 2002-02-21
    • David NorrisWolfgang Driesel
    • David NorrisWolfgang Driesel
    • G01R33/48A61B5/055G01R33/563G01R33/567G01V3/00
    • G01R33/56509G01R33/56341
    • The invention relates to a magnetic resonance imaging method which is characterized in that the transversal magnetization excited in the object to be imaged is diffusion-weighted before the useful echo (E) used for the reconstruction of an image is induced. When the object is moved, phase changes in the diffusion-weighted transversal magnetization can occur that lead to artifacts in the reconstructed image. These disturbing phase changes are measured by analyzing a navigation signal (N1, N2) that is generated before the useful signal is generated. The result of the measurement is used to change the phase characteristics of the transversal magnetization online by a correctional intervention (C0, C1, C2) in such a way that the measured phase changes are compensated. The invention further relates to a magnetic resonance device for carrying out said method.
    • 本发明涉及一种磁共振成像方法,其特征在于,在用于重建图像的有用回波(E)被诱导之前,在待成像对象中激发的横向磁化被扩散加权。 当物体移动时,扩散加权横向磁化的相位变化可能会导致重构图像中的伪像。 通过分析在生成有用信号之前产生的导航信号(N1,N2)来测量这些干扰相位变化。 测量结果用于通过校正干预(C0,C1,C2)在线改变横向磁化的相位特性,使得测量的相位变化得到补偿。 本发明还涉及一种用于执行所述方法的磁共振装置。