Abstract: A data duplication method and system used between USB devices is exploited to control data transmission between a source USB device and at least a target USB device without any assistance from a computer. The duplication system comprises at least a serial interface engine circuit, a CPU, and a data buffer unit. The CPU is connected to the source USB device and these target USB devices via these serial interface engine circuits. The CPU controls these serial interface engine circuits to transmit digital data in the source USB device to these target USB devices. The data buffer unit is connected to these serial interface engine circuits and the CPU, and is used to provide memory buffer space required during the digital data duplication process.

Abstract: A mobile image retrieving and storing device mainly comprises a USB hub circuit with a plurality of USB transferring interface units inside and a flash memory circuit with a USB transferring unit therein. The flash memory circuit is connected to the USB hub circuit and a digital camera circuit by the USB transferring interface; a USB transferring unit is in the digital camera circuit, and the digital camera circuit is connected to the USB hub circuit by the USB transferring interface. The characteristic of the present invention is to integrate the digital camera circuit and the flash memory circuit into one device by an expanding USB transferring interface.

Abstract: A media-broadcasting device having USB slots is described. The media-broadcasting device connects to a USB-based memory device through the USB slot and has a main controller connected to the memory device through the USB slot for access to digital data stored in the memory device, an interior memory buffer connected to the main controller for temporarily storing the digital data under the command of the main controller, and an MP3 module connected to the main controller for retrieving and processing the digital data through the main controller.