公开(公告)号：US20060147046A1

公开(公告)日：2006-07-06

申请号：US11280952

申请日：2005-11-16

Applicant: Sudhir Kasargod ,  Sapna George

Inventor： Sudhir Kasargod ,  Sapna George

IPC: H04R5/00 ,  H03G5/00

CPC classification number: H04S1/002 ,  H03G5/04

Abstract: The present invention may be used to improve the quality of music output from audio systems by simulating the effect of low frequency signals in the human ear. This thus allows listeners to perceive the lower frequencies signals, even though the speakers may be incapable of providing such low frequency outputs. The present invention provides simple methods for processing enhancing bass effect in audio signals. The simple methods also result in the bass enhancement being computationally less intensive. The bass effect enhancement techniques described in a first and second embodiment are based on the response of sine and cosine transfer functions and on the directional independence of low frequency components. The human ear is unable to resolve directions from low frequency components. The bass effect enhancement technique described in a third embodiment is based on response of a exponential transfer function.

Abstract translation: 本发明可以用于通过模拟人耳中低频信号的影响来提高音频系统音乐输出的质量。 因此，即使扬声器不能提供这样的低频输出，这也允许听众感知较低频率的信号。 本发明提供用于处理音频信号中增强低音效果的简单方法。 简单的方法也导致低音增强在计算上不那么密集。 在第一和第二实施例中描述的低音效果增强技术基于正弦和余弦传递函数的响应以及低频分量的方向独立性。 人耳不能解决低频部件的方向。 第三实施例中描述的低音效果增强技术是基于指数传递函数的响应。

公开(公告)号：US20050144017A1

公开(公告)日：2005-06-30

申请号：US10940593

申请日：2004-09-14

Applicant: Prakash Kabi ,  Sudhir Kasargod ,  Sapna George

Inventor： Prakash Kabi ,  Sudhir Kasargod ,  Sapna George

IPC: G10L19/025 ,  G10L19/035 ,  G10L19/00

CPC classification number: G10L19/025 ,  G10L19/035

Abstract: An MPEG-1 layer 3 audio encoder, including a scalefactor generator for determining first scalefactors for encoding a block of audio data if a temporal masking transient is not detected in said block of audio data; and for selecting the maximum of said scalefactors for encoding said block of audio data it a temporal masking transient is detected in said block of audio data to enable greater compression of said audio data. Increases in quantization error, due to use of the maximum scalefactor are pre-masked or post-masked by the temporal masking transient. In cases where the last portion of a block includes a temporal masking transient that masks the preceding portions of the block, the maximum scalefactor is only used to encode the block if the resulting increase in quantization error is less than 30% of the quantization error for the block.

Abstract translation: 如果在所述音频数据块中没有检测到时间屏蔽瞬变，则MPEG-1层3音频编码器包括比例因子发生器，用于确定用于对音频数据块进行编码的第一比例因子; 并且为了选择用于对所述音频数据块进行编码的所述缩放因子的最大值，在所述音频数据块中检测到时间屏蔽瞬变，以便能够对所述音频数据进行更大的压缩。 由于使用最大比例因子而导致的量化误差的增加被时间掩蔽瞬态预掩蔽或后掩蔽。 在块的最后部分包括屏蔽块的先前部分的时间掩蔽瞬变的情况下，如果所产生的量化误差增加小于量化误差的30％，则最大比例因子仅用于编码块 块。