Abstract: A method and apparatus for providing an indication as to whether an aircraft can safely glide to a selected location. An electronic processor is provided with a manual data input, a Loran navigation system input, or electronic altimeter input, a memory, a display, and a processor program. Data representing the identity, location, and other features of a set of possible airport landing sites are stored in the memory. Data representing the aircraft flight performance parameters is entered manually. Based on the airport data, aircraft performance data, Loran data, and altimeter data, the program causes the processor to determine and display a predetermined number of nearest airports, the altitude required to glide to those airports from the aircraft's current location, or the difference between the distance to the airports and the distance the aircraft can glide from its current altitude, and whether the aircraft can safely glide to a selected airport.

Abstract: A tunable bandpass filter system and filtering method wherein the bandwidth of a tunable bandpass filter is adjusted as a function of the fundamental frequency of an input signal. Either a constant bandwidth or a constant quality factor tunable bandpass filter may be used. The center frequency of the tunable bandpass filter is adjusted in direct proportion to the product of the fundamental frequency and the number of a selected harmonic thereof. In the case of a constant bandwidth filter the bandwidth is adjusted in direct proportion to the quotient of the fundamental frequency divided by a selected filter quality factor. In the case of a constant quality factor filter, the bandwidth is indirectly controlled by adjusting the center frequency while adjusting the quality factor in inverse proportion to the harmonic number. The output amplitude of the filter is measured to determine the amount of distortion in the input signal. The fundamental frequency may be determined by measuring the input signal.

Abstract: A pill dispenser particularly adapted for use by the physically or mentally infirm. A plurality of containers are arranged in a matrix, each for receiving, storing and selectively releasing one or more pills. The columns of the matrix correspond to days of the week, while the rows of the matrix correspond to times of the day. The containers are housed in a box which may be placed on its back for loading the containers with pills, and mounted vertically for use in dispensing of the pills. A guide is associated with the containers for receiving the contents of the containers and guiding them to a predetermined outlet. A removable cover is placed over the containers, the cover having push buttons which selectively actuate the containers, the push buttons being identified by labels for day of the week and time of the day.