公开(公告)号：US07218404B2

公开(公告)日：2007-05-15

申请号：US10929458

申请日：2004-08-31

申请人： Naoki Tsuchitoi

发明人： Naoki Tsuchitoi

IPC分类号： G06F3/12 ,  F06F15/00 ,  G06K1/00

CPC分类号： H04L69/22

摘要： A printing apparatus discriminates whether received print data is print data converted into a job packet constructed by a header portion and a data portion or print data which is not converted into a job packet and switches the processing operation in accordance with the print data.

摘要翻译： 打印装置鉴别所接收的打印数据是否被转换成由头部部分和数据部分构成的作业包的打印数据或未被转换成作业包的打印数据，并根据打印数据切换处理操作。

公开(公告)号：US06963892B2

公开(公告)日：2005-11-08

申请号：US10025870

申请日：2001-12-26

申请人： Dongxing Jin ,  Ping Wan ,  Leonard Marziliano

发明人： Dongxing Jin ,  Ping Wan ,  Leonard Marziliano

IPC分类号： G06F17/14 ,  F06F15/00

CPC分类号： G06F17/142

摘要： A method and apparatus for performing a fast Fourier transform (FFT) computation on large data sizes in real time is provided. The speed at which a FFT is performed is increased by reducing the number of times a Direct Memory Access (DMA) unit must transfer data between an internal memory and an external memory. This is achieved through an algorithm in which data is imported from the external memory into the internal memory and having the CPU perform several calculations on the imported data before it is exported back to the external memory. The imported data in the internal memory has a structure that results in a reduction of the number of times the imported data is swapped between different layers of the internal memory during the FFT computation. Furthermore, the DMA unit import/exports data between the internal memory and the external memory while at the same time having the CPU perform calculations on other data in the internal memory.

摘要翻译： 提供了一种用于对大数据量实时执行快速傅立叶变换（FFT）计算的方法和装置。 通过减少直接存储器访问（DMA）单元必须在内部存储器和外部存储器之间传送数据的次数来增加执行FFT的速度。 这是通过将数据从外部存储器导入内部存储器并使CPU在导出到外部存储器之前对导入的数据执行多个计算的算法来实现的。 内部存储器中导入的数据具有导致FFT计算期间导入的数据在内部存储器的不同层之间交换次数的结构。 此外，DMA单元在内部存储器和外部存储器之间导入/导出数据，同时使CPU对内部存储器中的其他数据执行计算。