Abstract: A shaker test apparatus is provided along with a method of collecting and processing images, wherein a shaker table is driving the device under test by a vibration controller at a known vibration frequency and period, wherein a device under test obtains a steady-state vibration characteristic of that excitation frequency when mounted on the shaker table. While the device under test is being excited, a trigger signal controller triggers a camera to capture a series of still image frames at a regular sampling frequency that is less than the vibration frequency (under-sampling), and a timer associated with the camera records a timestamp of an image capture time for each image frame. A computer processor uses the timestamps to remap the order of the image frames, shifting each frame's capture time backwards by a specified multiple of vibration periods in order to correctly represent a single vibration period beginning with an earliest captured image.

Abstract: A shaker test apparatus is provided along with a method of collecting and processing images, wherein a shaker table is driving the device under test by a vibration controller at a known vibration frequency and period, wherein a device under test obtains a steady-state vibration characteristic of that excitation frequency when mounted on the shaker table. While the device under test is being excited, a trigger signal controller triggers a camera to capture a series of still image frames at a regular sampling frequency that is less than the vibration frequency (under-sampling), and a timer associated with the camera records a timestamp of an image capture time for each image frame. A computer processor uses the timestamps to remap the order of the image frames, shifting each frame's capture time backwards by a specified multiple of vibration periods in order to correctly represent a single vibration period beginning with an earliest captured image.

Abstract: A vibration control system provides a user-specified value of kurtosis as well as user control over a baseline random spectral density profile. The baseline random spectral density profile and a signal that embeds the desired value of kurtosis are summed in the frequency domain prior to forming a time-domain output waveform that drives a vibration table with attached unit under test. Feedback from a sense transducer attached to the vibration table or the unit under test measures the as-realized vibration's random spectral density and kurtosis value, which are then compared to the desired values to allow correction.

Abstract: The present invention utilizes multiple A/D (analog-to-digital) paths and cross-path calibration to provide accurate and reliable measurements for each input channel in a data acquisition system. When the system and method are applied, user and automated methods of selecting among a number of alternative input range settings can be reduced, or even eliminated. That is, there is a significant reduction or complete elimination of input range settings in a measurement system. For each measurement channel of interest, the input signal is directed to at least two paths, e.g., Path A and Path B. The first path measures the full range (e.g., +/?10 volts), while the second path includes a high-gain amplifier. Each path includes an analog-to-digital converter (ADC), so that there is a one-to-one correspondence between the number of paths and the number of ADCs, which sample the input signal simultaneously.

Abstract: The present invention utilizes multiple A/D (analog-to-digital) paths and cross-path calibration to provide accurate and reliable measurements for each input channel in a data acquisition system. When the system and method are applied, user and automated methods of selecting among a number of alternative input range settings can be reduced, or even eliminated. That is, there is a significant reduction or complete elimination of input range settings in a measurement system. For each measurement channel of interest, the input signal is directed to at least two paths, e.g., Path A and Path B. The first path measures the full range (e.g., +/?10 volts), while the second path includes a high-gain amplifier. Each path includes an analog-to-digital converter (ADC), so that there is a one-to-one correspondence between the number of paths and the number of ADCs, which sample the input signal simultaneously.

Abstract: A method for removing a step response ripple from a digital signal is accomplished by passing the digital signal through a low pass filter and a decimation filter forming a resultant signal, and filtering the resultant signal with a 4-tap Finite Impulse Response filter (FIR), wherein when half a sampling frequency is normalized as 1, the FIR has a transition band of greater than or equal to 0.1 of the normalized frequency resulting in a signal without a step response ripple.

Abstract: A web based user interface that enable users to view and control a system running inside a corporate intranet when the user is outside the corporate network. A user interface is provided on a web site so that a user can acquire access to a controller of a system through the Internet. This is securely accomplished over the Internet by receiving security information from a first client over a network, receiving a query from a second client requesting access to the first client over a network, prompting the second client for security information to allow access to the first client, and enabling the second client access to the first client based on the security information provided by the second client.

Abstract: A method for enabling software to operate with hardware includes receiving a license key that has information regarding hardware configuration, software configuration, license key transaction history and license key warranty period. A software configuration is determined from the license key. It is then determined if the software configuration is within the license key warranty period. If it is the software is enabled with a time stamp based on the hardware configuration and the license warranty period.

Abstract: A signal analysis system is provided that includes master DSP circuitry, slave DSP circuitry, a LVDS bus, wherein the LVDS bus couples the master DSP circuitry to the slave DSP circuitry, and a USB interface, wherein the USB interface is coupled to the master DSP circuit.

Abstract: An interface includes a slave digital signal processor (DSP) and a master DSP connected to the slave DSP through a communications port. The master DSP includes a memory; and a direct memory access (DMA) to the memory. A field programmable gate array (FPGA) is connected to the master DSP. The FPGA includes a dual port random access memory (RAM) in communication with the DMA. A universal serial bus (USB) interface is connected to the FPGA through the dual port RAM.