摘要:
A drive array controller is provided that serves as an interface between both stand-alone SCSI devices as well as SCSI devices that form a composite drive. Since an AHA emulation interface is incorporated on the drive array controller, the drive array controller is compatible with conventional AHA device drivers that drive stand-alone peripheral devices such as SCSI CD-ROM units and SCSI tape drives. The drive array controller includes a SCSI pass-through driver that extracts a SCSI command descriptor block from a command control block created by the AHA device driver. The drive array controller further provides a separate peripheral access channel to support high speed composite drive operations through a composite device driver. Since the AHA emulation interface and a composite drive interface are provided on a common peripheral board, only one EISA expansion slot is occupied.
摘要:
A method and apparatus makes rapid frequency measurements by measuring time intervals for a series of blocks of event counts with the number of events in each block held constant. This makes the numerator of the events/time relationship constant so it does not have to be measured, processed or stored. The frequency of the signal is determined by measuring the time interval, then taking the inverse of the measured value and multiplying by the appropriate constant. A fast inverse circuit uses a Taylor series expansion technique implemented in digital circuit, with the slope resolution adjusted for regions of small slope to improve accuracy.
摘要:
Signal processing device comprising: a signal analyser (7) for analysing a received signal into the subband domain; a first signal path (10) and a second signal path (11), the first signal path (10) being decoupled from the second signal path (11), whereby the first signal path (10) and the second signal path (11) are arranged to pass the received signal; only the first signal path (10) includes automatic gain control (3), the first signal path (10) further includes one or more speech metric functions (4, 5, 6) to determine estimated gain functions therein, the signal in the first signal path being passed from the automatic gain control (3) to the one or more speech metric functions (4, 5, 6) to enable determination of the estimated gain functions, the estimated gain functions determined by the one or more speech metric functions being combined to generate an overall gain function which is applied (9) to the signal (14) in the second signal path (11) to generate an enhanced signal; and a signal synthesiser (8) for synthesising the enhanced signal (12) into a fullband representation.
摘要:
A self-contained multimedia presentation system presents a menu-driven classroom curriculum in compliance with standardized educational requirements. The disclosed system includes a multimedia presentation device for projecting video, images and playing audio recordings. The multimedia presentation device includes an embedded computing device having a minimal set of control functions for presenting to a user a simplified control interface facilitating use of said multimedia presentation device. A pre-programmed storage medium includes engaging multimedia educational programs for uniquely presenting educational material complying with predetermined educational objectives. The predetermined educational objectives prepare learners for specific standardized achievement goals. Included testing features assist in evaluating student achievement and fulfillment of standardized educational requirements. The system is flexible in use and can be used according to a prescribed usage plan (included), or ad-hoc as needed to assist in teaching.