An elongated body is provided for use as a threshold and is transversely stepped whereby the body includes high and low opposite side longitudinally extending upper surfaces. The body includes a central upstanding surface extending between the high and low upper surfaces with the latter extending transversely of the body in opposite directions from the upper and lower margins of the upstanding surface. The portion of the low upper surface adjacent the lower margin of the upstanding surface is tr...

An improved threshold assembly for mounting on a door and a door sill is described which includes a sill-mounted portion with a threshold plate formed of nonmagnetically attracted material and a door-mounted portion with a door cap for mounting on the bottom edge of the door with a flexible magnet-holding device. Two elongated magnets are mounted one in each portion of the threshold assembly, and, when the door is in the closed position, the magnets are positioned one on top of the other. The ma...

To permit evaluation of only slowly changing low amplitude undulating signals, derived for example from a wheel-speed transducer of a brake anti-block system, and to obtain essentially square-wave output voltage signals having a 1:1 pulse to pulse gap ratio for further signal processing, a temperature stable threshold switch is provided by connecting transistors forming a difference amplifier and purposely mismatched to the input, the mismatch of the transistors defining the threshold level, and...

A transferred electron logic input device (TELD) is cascaded with a field effect transistor output device (FET) to provide a threshold gate having switching times compatible with gigabit rate logic and having the capability to drive low impedance loads.

There is disclosed a threshold circuit for a long coded pulse having a given amplitude subdivided into a plurality of chips, each providing a code bit. A first circuit receives the coded pulse to compress the coded pulse into a shorter pulse of much greater amplitude than the given amplitude and to detect the compressed pulse. A second circuit also receives the coded pulse, detects the coded pulse and provides an amplitude threshold voltage. A third circuit coupled to the first and second circui...

A simple and inexpensive direct current voltage level detector is shown which has a significant immunity against interfering alternating current signal components. The output of a standard analog threshold detector is successively sampled by clock pulses having twice the repetition rate of the frequency of the expected interfering alternating current components. By requiring two successive samples to be above the threshold of detection, immunity is provided against false detection due to tempora...

A threshold generator for an FSK demodulator compensates for selective fading of the FSK signal. The peak positive and negative amplitude excursions in a composite envelope signal, representative of detected mark and space tone signals, are sampled and respectively stored in two sample and hold circuits. The average value of the amplitude values stored in the sample and hold circuits is computed to establish a threshold signal. When no transitions occur in a demodulated data signal for a predete...

An adjustable threshold assembly includes a base member having a central groove for receiving an inverted U-shaped channel threshold member, which is supported by a plurality of wedge sets spaced at regular intervals and each consisting of a fixed bottom wedge and a top wedge removably fastened to the web of the threshold member by passage of a screw through a slot in the web. Height adjustment is provided by lateral translation of the top wedges in cooperation with the corresponding fixed botto...

A threshold circuit for signal receiving equipment, particularly optical signals travelling to or from a rapidly flying object comprises a threshold determining device having an input accepting signal and noise pulses and an output emitting transmitted pulses which correspond to the signal and noise pulses that pass the threshold unit. Control circuits determine the threshold that is employed in response to the received signal and noise pulses. If the received signal and noise pulses have a rela...

This invention relates to an improvement for adjustable thresholds. The invention includes a threshold base having a channel extending through the length of the base. Sitting in the channel of the base is an elongated bar having an inverted U-shape cross-section. Throughout the length of the bar are several holes extending through the base of the U-shaped section. Several of these holes are threaded and a bolt is screwed into the threaded hole with the head of the bolt sitting on the bottom of t...