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    • 8. 发明授权
    • Methods and systems for sample rate conversion
    • 采样率转换的方法和系统
    • US07409339B2
    • 2008-08-05
    • US10641034
    • 2003-08-15
    • Hoang Nhu
    • Hoang Nhu
    • G10L19/14G10L21/00H04B15/00
    • H04N21/426H04N5/4401H04N5/46H04N7/035H04N21/4263H04N2005/91364
    • Methods and systems for sample rate conversion convert a sampled signal to a higher data rate signal. Conversion pulses are received, having a conversion rate that is higher than the sample rate of the sampled signal. Sample points are then reconstructed from the sampled signal, in real time, on either side of a conversion pulse. An interpolation is performed between the reconstructed sample points, at the time of the conversion pulse. The interpolation results are outputted in real time. The process is repeated for additional conversion pulses. The outputted interpolated amplitudes form the higher data rate signal having a data rate equal to the conversion rate. Sample rate conversion is thus performed in real time according to the higher data rate clock, rather than with fixed ratios. As a result, when the higher data rate clock is affected by, for example, jitter or other frequency variations, the higher data rate samples immediately track the lower data rate samples. This helps to insure that the output higher data rate data tracks the lower rate data, thus providing a more accurate sample rate conversion.
    • 采样率转换的方法和系统将采样信号转换为较高的数据速率信号。 接收转换脉冲,其转换速率高于采样信号的采样率。 然后,在转换脉冲的任一侧,实时地从采样信号重建取样点。 在转换脉冲时,在重建的采样点之间进行内插。 插值结果实时输出。 对于额外的转换脉冲重复该过程。 输出的内插幅度形成具有等于转换速率的数据速率的较高数据速率信号。 因此,根据较高的数据速率时钟,而不是固定比率,实时采样速率转换。 结果,当较高数据速率时钟受到例如抖动或其它频率变化的影响时,较高的数据速率采样会立即跟踪较低的数据速率采样。 这有助于确保输出较高的数据速率数据跟踪较低的速率数据,从而提供更准确的采样率转换。
    • 9. 发明授权
    • Method and apparatus for processing image files
    • 用于处理图像文件的方法和装置
    • US06741746B2
    • 2004-05-25
    • US10072245
    • 2002-02-08
    • Yoav EpsteinKirkpatrick William NortonHoang Nhu
    • Yoav EpsteinKirkpatrick William NortonHoang Nhu
    • G06K936
    • G06Q50/08
    • A method and apparatus for manipulating digitized images stored as variable length encoded bitstreams such as JPEG format in a manner that reduces memory and processor resource requirements. A prescan means sequentially decompresses the bitstream to identify the location of encoded pixel image areas. Designated ones of these locations are recorded or stored in a prescan table. After the prescan operation has been performed on the image, image manipulations such as rotating, cropping, and zooming can be performed on a selected portion of the image by directly accessing only the encoded pixel image areas to be manipulated, without the need to sequentially decode and store all the encoded image areas in order to locate the ones of interest.
    • 一种用于以减少存储器和处理器资源需求的方式操纵存储为可变长度编码比特流(例如JPEG格式)的数字化图像的方法和装置。 预扫描装置顺序地解压比特流以识别编码的像素图像区域的位置。 指定的这些位置被记录或存储在预扫描表中。 在对图像执行预扫描操作之后,可以通过直接仅访问要被操纵的编码像素图像区域而对图像的所选部分执行诸如旋转,裁剪和缩放的图像处理,而不需要顺序地解码 并存储所有编码的图像区域以便定位感兴趣的图像区域。