A method and apparatus for generating digitized quadrature samples which approximate the sampled complex envelope of an input waveform by digitally sampling the input signal and applying the resultant digital samples to a digital processing system to obtain pairs of quadrature samples of the input signal. The input digital samples are digitally combined, delayed, and multiplied by the digital processor to form the quadrature samples. An alternative method and apparatus takes digital samples from...

The specification discloses a technique for generating seismic impulses which includes suspending a plurality of discrete explosive charges one above the other. Detonation wires lead to detonation caps attached to each of the explosive charges. Circuitry generates a plurality of firing pulses which are applied to the detonation wires to sequentially explode the charges from top to bottom. All of the charges are detonated within a time interval less than the time required for the blast from the t...

Method and apparatus for generating a plurality of separate and distinct signal beams of mutually coherent radiation. The signal beams, which are of substantially equal intensity, are produced as the result of interference generated by directing a beam of coherent radiation at a radiation-impeding medium having a plurality of regularly spaced and substantially identical zones of variable impedance (e.g., a plurality of very small cylindrical lenses or mirrors). The invention is illustrated as it...

A self-check number generating device for generating/validating check numbers associated with a data entry/verification or data transmission system. The generating device is operable in a plurality of modes and may be used for generating or merely validating a check number to be appended to a data number or word.

Microwave pumping of an alkali halide crystal doped with hydroxyl electric dipole impurity ions and subjected to a (001) dc electric field, will increase the population of the 3A.sub.1 dipolar energy level (the energy level notation applies to the usual case of preferred alignment of the hydroxyl dipoles along the (100) axes, such as in KC1) of the impurity ion when the microwave frequency is in resonance with the 1A.sub.1 .fwdarw.3A.sub.1 transition. Relaxation rates between various dipolar ene...

A transmitter for a telegraph receiver in which the bit rate is determined by a high-frequency oscillator and a binary counter frequency divider. The binary counter is reset to an initial condition at the beginning of the transmission of the stop or idle signal after transmission of all of the data bits of a given character. The counter is reset in order to count an initial count of less than its full capability, and the reset of the counter at the end of transmission of a character is delayed f...

A cell-type apparatus for directly generating electric power which comprises an enclosed glass tube made of glass containing sodium oxide, an anode and a cathode disposed respectively on the inner and outer surfaces of said glass tube, and vapor of cesium filling said glass tube; and which is used at an elevated temperature above about 100.degree. C.

A tapered enclosure for a body of water has a wave generator positioned in a relatively narrow and deeper end. In one form, the wave generator is a buoyant plunger mounted for vertical reciprocation within a chamber having a shorewardly facing opening. Through a cyclic control system, the plunger is driven in phase with the forces of gravity and buoyancy acting thereon, starting from a rest position through strokes of increasing amplitude until a desired steady state is attained to sequentially ...

Apparatus for the generation and radiation of microwave radiation including a microwave oscillator having a cavity resonator directly coupled with the input of a horn resonator by way of a first apertured diaphragm. There is arranged within the horn radiator a second apertured diaphragm disposed at a distance from the first apertured diaphragm such that together with the first diaphragm it forms a filter resonator.

Disclosed is an electrolytic cell for the generation of low cost halogen biocidally active agent from an aqueous solution having a low halogen salt content for use in the treatment of sewage or other liquid effluents, especially those of fresh water swimming pools or fresh water cooling towers. The electrolytic cell is used in line with pumps generally associated with the distribution of waters for swimming pools or cooling towers.