Abstract: The present invention discloses a USB3.0 clock frequency generation device without crystal oscillator, that is, the crystal oscillator used in the USB3.0 device (or apparatus) is removed and replaced with an oscillator circuit module in the present invention, in which a simple circuit module is added to the controller circuit of the USB3.0 device to provide accurate and proper timing signals needed. The oscillator circuit module includes an oscillator block, a frequency divider block, a delta-sigma modulator block, and a preset number block.
Abstract: An earpiece is provided for use in auditory testing of infants which is formed of a toroidal baffle of anechoic insulative foam material having on one side a clear window and on the opposing side an adhesive material for binding to the region around the ear of an infant. The earpiece is further provided with a pneumatic connector for coupling acoustic energy through a pneumatic tube into the cavity formed around the ear of a subject when the earpiece is attached.