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公开(公告)号：US08638953B2
公开(公告)日：2014-01-28
申请号：US12833606
申请日：2010-07-09
IPC分类号： H03G5/00
CPC分类号： H04R3/04 , H04R2499/11
摘要： In many audio playback systems, frequencies below a given cut off frequency are suppressed either due to speaker constraints or safety constraints. For example, some speakers are only capable of generating signals above a certain frequency. Prolonged low frequency sound can cause damage to speakers or other components. An audio driver can be equipped with a phantom bass module which by doubling, tripling and/or quadrupling frequencies below a cutoff frequency can simulate the bass experience. The doubling, tripling and quadrupling methods disclosed provide a low complexity formulation of a frequency doubling, tripling and quadrupling. In addition, the frequency doubling, tripling and quadrupling formulations are easily adapted to multi-rate processing, where computational savings can be very high.
摘要翻译： 在许多音频播放系统中，由于扬声器约束或安全限制，抑制给定截止频率以下的频率。 例如，一些扬声器只能产生高于特定频率的信号。 延长的低频声音可能会损坏扬声器或其他部件。 音频驱动器可以配备幻影低音模块，通过将截止频率以下的频率加倍，三倍和/或四倍，可以模拟低音体验。 所公开的加倍，三倍和四倍的方法提供了倍频，三倍和四倍的低复杂度公式。 此外，倍频，三倍和四倍的配方可以很容易地适用于多速率处理，其中计算节省可能非常高。
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公开(公告)号：US08253610B2
公开(公告)日：2012-08-28
申请号：US12932170
申请日：2011-02-17
IPC分类号： H03M7/00
CPC分类号： H03M5/02 , H03H17/0275 , H03H17/0642 , H03H17/0685
摘要： Poly-phase filters are used to offer an efficient and low complexity solution to rate conversion. However, they suffer from inflexibility and are not easily reconfigured. A novel design for rate converters employ poly-phase filters but utilize interpolation between filter coefficients to add flexibility to rate conversion. This interpolation can be implemented as an interpolation of the poly-phase filter results. Additional approximations can be made to further reduce the amount of calculations required to implement a flexible rate converter.
摘要翻译： 多相滤波器用于提供高效且低复杂度的速率转换解决方案。 但是，它们不灵活，不容易重新配置。 用于速率转换器的新颖设计采用多相滤波器，但是利用滤波器系数之间的内插来增加速率转换的灵活性。 该插值可以实现为多相滤波器结果的内插。 可以进行额外的近似以进一步减少实现灵活的速率转换器所需的计算量。
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公开(公告)号：US07920078B2
公开(公告)日：2011-04-05
申请号：US12488322
申请日：2009-06-19
IPC分类号： H03M7/00
CPC分类号： H03M5/02 , H03H17/0275 , H03H17/0642 , H03H17/0685
摘要： Poly-phase filters are used to offer an efficient and low complexity solution to rate conversion. However, they suffer from inflexibility and are not easily reconfigured. A novel design for rate converters employ poly-phase filters but utilize interpolation between filter coefficients to add flexibility to rate conversion. This interpolation can be implemented as an interpolation of the poly-phase filter results. Additional approximations can be made to further reduce the amount of calculations required to implement a flexible rate converter.
摘要翻译： 多相滤波器用于提供高效且低复杂度的速率转换解决方案。 但是，它们不灵活，不容易重新配置。 用于速率转换器的新颖设计采用多相滤波器，但是利用滤波器系数之间的内插来增加速率转换的灵活性。 该插值可以实现为多相滤波器结果的内插。 可以进行额外的近似以进一步减少实现灵活的速率转换器所需的计算量。
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公开(公告)号：US07187713B2
公开(公告)日：2007-03-06
申请号：US10158992
申请日：2002-05-29
申请人： William W. Jones , Ragnar H Jonsson
发明人： William W. Jones , Ragnar H Jonsson
IPC分类号： H04B1/38
摘要： Modem start-up delay reduced by measuring condition of communications line upon connection termination. Variation between termination and start-up line conditions determines if cold or warm start is required. Warm-start may use original condition descriptors. Condition represented by ambient noise, echo or spectral response of channel.
摘要翻译： 通过连接终止时通信线路的测量条件减少调制解调器启动延迟。 终止和启动线路条件之间的变化确定是否需要冷启动或热启动。 热启动可以使用原始条件描述符。 由环境噪声，回波或通道频谱响应所表示的条件。
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