A characteristics corrector in a video signal processing system is described for correcting characteristics of the video signal processing system at the time of recording and/or reproducing a video signal. The corrector includes a reference pulse generating circuit for generating reference pulses of varying amplitude corresponding to gradations from a black level to a white level of a video signal to be recorded during a blanking period of the video signal to be recorded. It further includes a p...

Characteristics of photolithographically-defined planar semiconductor device pairs made from the same master are different, but many of the differences are regular in kind. To achieve a device pair in which the magnitude of the difference in the characteristics of the elements of the pair is reduced, two pairs are made from the same master. The first element of one pair is connected to the second element of the other pair so that the two operate as one composite element. The second element of th...

This disclosure relates to a valve having a cylindrical flow restricting element housed therein. Ports formed in the flow restricting element are progressively and cumulatively exposed to the flow of fluid thereby controlling flow through the valve. The ports are of a predetermined configuration such that the flow area varies as a characteristic function of the length of the axial movement of the flow restricting element.

In the operation of an ink jet printing system which recycles unused ink, changes in the formulation of the ink being used for printing which can cause deterioration of printing, is avoided by an arrangement for sensing the amount of ink in an ink reservoir and replenishing it when below a predetermined level, with a solvent-ink mixture which restores the ink in the reservoir to a proper formulation.

Apparatus for indicating the characteristics of a fluid is disclosed in accordance with the teachings of the present invention wherein the fluid is permitted to pass freely within a chamber which contains a float disposed for limited vertical movement and minimal lateral deflection. Vertical movement of the float is communicated to an electrically conductive member mechanically coupled thereto. The electrically conductive member is in close proximity and magnetically coupled to a magnetization i...

Simulating, with a standard gauge shotgun, the shooting characteristics of a smaller gauge shotgun by using a shotshell whose case fits the chamber of the standard gauge gun, but whose propellant charge, shot charge, priming and confinement are coordinated to produce ballistic results resembling those of the smaller gauge gun, and the shot charge is circumferentially surrounded by a bushing whose outside diameter corresponds with the standard gauge, and whose inside diameter corresponds with the...

An acoustic characteristics changing device includes a frame member disposed in an acoustic energy field, electro-acoustic conversion means attached to the frame member to constitute at least a portion of the device, variable impedance means connected as an electrical load to the electro-acoustic conversion means, and impedance control means for controlling an equivalent impedance of the variable impedance means. The equivalent impedance is variably controlled, so that an acoustic impedance and ...

A method of determining the volume of gas in a well below the wellhead includes measuring the gas flow rate in the well annulus, closing the wellhead and measuring the change in pressure with time, and calculating the volume from the recorded data. A further method includes determining the change of pressure with time with the wellhead closed, venting the well through a calibrated orifice and measuring pressure changes with time for a short interval of time, and calculating from the recorded dat...

A processor for a quick measurement of statistically significant variations f the characteristics of a signal in the presence of noise wherein the processor measures the variance of a wave parameter such as the time period of the signal. The processor also measures the signal-to-noise ratio from which the variance of the time period of the signal is calculated. A comparison of the measured and the calculated values of the variance of the time period thus gives information about the small variati...

A loudspeaker system having two angled rear panels with four drivers on each rear panel and a single driver on the front panel has the drivers connected in series between first and second terminals and a third terminal connected to the junction of the front driver and one of the banks of series-connected rear drivers. First and second power amplifiers are connected between the third terminal and the first and second terminals, respectively. A potentiometer is connected between the inputs of the ...