Abstract: An input signal of unknown frequency is applied to a sampler which is driven by a sampling signal of frequency f.sub.O to produce an intermediate signal of frequency f.sub.IF. The sampling frequency f.sub.O varies in response to a randomly, or pseudo-randomly varying signal which in turn causes the signal of frequency f.sub.IF to also vary. f.sub.IF will vary in the same way as f.sub.O, but with a scale factor of .+-. N, where N is the harmonic number. Correlation techniques are used to determine the harmonic number and the sideband to enable calculation of the input frequency. Errors in the determination of the harmonic number and sideband due to frequency modulation of the input signal are reduced, due to the variation imposed on the sampling frequency f.sub.O.

Abstract: Two movable members are selectable positioned to form a passageway for handling dual in-line packages. A wheel, comprising resilient material, and a spreader member are selectable positioned in correspondence with the movable members to engage the leads on either side of the package and vertically straighten them. Lateral straightness of the leads, as well as various other package anomalies, are detected by optical scanning.

Abstract: A perfusion meter comprising a hand-held battery operated optical plethysmograph displays an indication of blood flow rate in response to the time-varying optical transmission characteristics of an ear or other organ. This indication, called the perfusion index, is proportional to both the amplitude and frequency of variations in the dynamic optical transmission characteristics of the ear or other organ.

Abstract: A polar display representing the ratio of two input signals is provided by exponentiating the logarithmic ratio of two input signals. The DC voltage thus produced, which is proportional to the ratio between the two input signals is then multiplied by a constant amplitude AC signal derived from one of the input signals and thus converted to an AC signal which is phase coherent with that input signal. This AC signal is then split into its orthogonal components, using an AC signal derived from the other input signal, to generate the X and Y coordinate of the polar diagram.

Abstract: An ear rack comprises a rigid frame coupled to a flexible base which is adapted for encircling an animal's head. The flexible base includes a strap-like portion which has perforations therethrough for engaging with a latching mechanism. The latching mechanism allows a predetermined amount of movement in the strap to provide for the maximum comfort of the animal by accommodating such animal movements as jaw movements during eating.

Abstract: Interlocking hinges are attached to printed circuit boards and coupled together to form a stack of printed circuit boards. Access to each board is possible by rotating the stack at a selected hinge to expose a selected board. A projection and an opening on each hinge mate with openings and projections on other hinges to allow easy removal or addition of a board from the stack when the hinges are in one relative position, but to create an interference fit in a second relative position, thereby causing the hinges to lock together and form a rigid structure.

Abstract: A carrier is suspended and moves on two shafts. The carrier includes a plurality of sealed roller bearings which form openings approximately equal to the dimensions of the shaft. One or more of the bearings is mounted on a leaf spring to provide a predetermined contact pressure between the bearings and the shaft. In addition, damping elements may be substituted for one or more of the sealed roller bearings to minimize interference from vibrations.

Abstract: A gain cell circuit is disclosed having an outer pair of common base transistors and an inner pair of common emitter transistors. External base resistors and emitter resistors are added to the common base transistors for controlling the zero formed by the internal capacitance of the common base transistors, thereby cancelling the dominant pole formed by the common emitter transistors and providing compensation and improvement in gain cell bandwidth.

Abstract: Clock signals, data words and qualifier signals are received via monitor probes during a data acquisition mode, selected data words being stored in a memory in response to the clock and qualifier signals. The stored data words may then be displayed in a tabular or a map format on a cathode ray tube screen. Data words may be acquired randomly, i.e., in a free-running sampling mode, or acquired selectively by using pattern recognition and delay trigger circuits. Using the tabular display format, data words are displayed as ones and zeroes. Using the map display format, each data word thus acquired is displayed on the CRT screen as a dot during a subsequent display mode. The position of each dot on the CRT screen uniquely identifies its address or state value. The most significant bits determine the vertical position on the CRT screen and the least significant bits determine the horizontal position of the dot. The intensity of the dot indicates the relative frequency of occurrence of that logic state.

Abstract: Apparatus for the controlled hot waxing of skis is disclosed. The apparatus includes an upwardly opening semi-cylindrical tub with closed ends. The tub is constructed of heat conductive material, and a heater is mounted on the exterior radial surface of the tub so that wax placed therein will be caused to melt at the appropriate temperature. A solid aluminum roller having axial struts projecting from the opposite ends thereof is rotatably mounted on the closed ends of the cylinder so that the lower portion of the roller will project into the melted wax and the upper portion of the roller will provide an exposed surface for contact with a ski. The roller and struts are of heat conductive material so that heat from the end walls of the tub is conducted through the struts to the roller. A covering is applied to the radial surface of the roller and has a preselected softness so that a ski passing over the covering will remain in full contact with the covering over the entire width of the ski.

Abstract: A multi-module, multi-port memory system includes modules having semiconductor memory circuits which require periodic refreshing to retain the contents stored therein. Priority circuits resolve conflicts between the multi-port access of the memory modules and the refreshing requirements of semiconductor memory circuits within the modules. The modules of the preferred embodiment are arranged in a polymorphous array of selectably expendable rows and columns. Modules utilizing different memory technologies may be combined within the address space of the array without interfering with independent multi-port access by various computer processors and other memory using devices.

Abstract: A spinner chuck having a recessed portion for receiving non-circular substrates is used to alleviate uneven build-up of photoresist coatings applied on the substrate. Openings are disposed in the base of the recess about the periphery thereof whereby to drain off coating material spun off into the volume between the substrate and chuck sidewall defining said recess.

Abstract: Data flow between multiple digital circuits having various internal clock rates is controlled by an asynchronous trigger bus. A trigger pulse is generated on the trigger bus when a trigger condition is simultaneously detected in two circuits desiring to communicate.

Abstract: A system for high-density data recording at low tape speeds receives a unipolar signal representing encoded digital data and transforms it to a bipolar signal having a constant pulse width. The low-frequency response required of the system is minimized because the power spectrum of the signal is altered through a time domain transformation. The narrow bandwidth enables the use of very low tape speeds at high bit packing densities. Tape speeds of 15/32 ips or less at densities about 20 thousand (k) bits per inch (BPI) are possible. The spectrum of the transformed code has no direct current (DC) component which eliminates the need for a base line compensator in the reproducing portion of the system.

Abstract: A triangular waveform is generated by alternately charging and discharging a capacitor through two voltage-controlled current sources. A single tuning amplifier and a variable impedance, coupled to the voltage-controlled current sources, allow the symmetry of the triangular waveform to be varied while a constant repetition rate is maintained.

Abstract: A counter circuit is incremented and decremented at a rate having a non-linear dependence on the rotational speed and direction of a rotary pulse generator.

Abstract: A digital circuit for use in a power meter provides relative power measurements by storing a value representing a first power measurement and using that value as a reference for processing subsequent power measurements.

Abstract: A network analyzer is coupled to a multi-band sweep oscillator and a display device to provide measurement and plotting of circuit parameters. Bi-directional interface circuits allow phase locking by the network analyzer over broad frequency sweeps and enable smooth and accurate plotting of system parameters despite frequency band switching by the sweep oscillator and relocking on new harmonic numbers by the network analyzer.