An adaptively coded forward error correcting data communications system having the capability of varying error correction potential without the necessity of variation in codes and without the necessity of increasing the percentage redundancy of transmitted data by adaptively varying the block length of the data transmitted utilizing varying data block lengths and in which more than a single block of data may be processed in over-lapping time relationship without full duplication of circuitry whi...

A cartridge type magnetic tape recorder has a planetary gearing mechanism for increasing the speed of rotation of the capstan shaft, to increase the speed of transport of the tape within a cartridge without increasing the speed of rotation of the associated drive motor. The planetary gearing mechanism has a sun gear secured to the capstan shaft and together with a ring gear is rotatable with the capstan shaft during normal operating conditions. By stopping rotation of the ring gear, the speed of...

A feed forward system for reducing the distortion products from a device such as an amplifier, wherein a sample of the device input signal is subtractively combined with a sample of the device output signal to produce a sample of the distortion products. The distortion sample is adjusted in phase and amplitude and subtractively combined with the device output to produce a distortion-reduced system output. First and second pilot signals, applied to the device input and output respectively, are de...

Artillery shell and bomb bursts may be simulated using motion picture tecques by projecting bursts on a projected landscape. To simulate dark colored ground level bursts, a film bearing the image of a burst is moved into focus in the optical system of a landscape projector. Air bursts are simulated in the same way with the additional step of lighting a second film bearing a dust cloud image and which is permanently focused in the optical path of an auxiliary projector. The image projected by the...

This specification discloses the packing of small planar or sheet-like items, particularly clothing labels, into containers, including an item support that shifts the items arcuately and then through a restricted opening into packed array in a container, and container advancing means that also operates a gate to close the opening during container advancement.

A feed-forward amplifier system for producing a high output with low distortion and noise across a wide frequency band. An amplified signal is compared with a time-delayed unamplified signal in a sampling loop to isolate the noise and distortion components produced by the main amplifier. These noise and distortion components are then amplified by an auxiliary amplifier and combined with the amplified main signal to effectively cancel the error thereof. The output impedance of the main amplifier ...

A plow sweep construction comprising a horizontal plate is provided including front and rear marginal edges. The center portion of the rear marginal edge includes structure for attaching the base plate to the lower end of the depending tool support shank and the front marginal edge portion of the plate includes generally straight opposite end portions inclined slightly forwardly toward the remote end portions. Also, the rear marginal edge of the plate includes generally straight opposite end por...

A thermostatic valve to be mounted in the coolant system of an internal combustion engine to control the flow of fluid through the system. A thermostatic valve of the forward poppet-type in which a single poppet cooperating with a single valve seating surface is independently responsive to both temperature and pressure for controlling the flow of fluid through said valve. The poppet is slidably engaged with the extending thermal element and spring biased into a seated or closed position. The pop...

Two embodiments of the visibility meter are disclosed. In the first embodiment, light transmitted from the light transmitter and light received by the light receiver is propagated in a conical beam. The beams are so oriented that they include an obtuse angle. In the first embodiment, a partition blocks all direct transmission of light from the light transmitter to the light receiver. In the second embodiment, direct transmission of light from the light transmitter to the light receiver takes pla...

A feed-forward system for reducing the distortion products from a device h as an amplifier, wherein a sample of the device input signal is subtractively combined with a sample of the device output signal to produce a sample of the distortion products. The distortion sample is adjusted in amplitude and phase and subtractively combined with the device output to produce a distortion-reduced system output. A synchronous detector correlates a sample of the system output, in which the proportion of di...