Abstract: An electronic noise-reducing system which includes a plurality of adaptive filters forming multiple stages of noise reduction and producing greatly increased signal-to-noise ratio. The input for the primary channel of the first adaptive filter, which forms the first noise-reducing stage, is the signal including multitones buried in noise. The reference channel ideally uses signal-free noise as input. The output of the first adaptive filter is used as the input to the primary channel of the second or final adaptive filter, whereas the reference channel thereof is fed with "clean noise". The clean noise can be obtained as the output of the intermediate adaptive filter by feeding simultaneously both the primary and reference channels of the intermediate filter with the noise-reduced waveform present at the output of the first noise-reducing filter.

Abstract: A method and apparatus for reducing noise from a near-field noise source sent together with signals from a far-field source. The method uses an adaptive shaping filter and a summer, in conjunction with a directional reference sensor and a primary sensor which have at least a common sensing element therebetween. The directional reference sensor situated between the near-field noise source and the far-field signal source, rejects the broad-band signal but accepts the broad-band noise and feeds this noise into a reference channel of the adaptive filter. The primary sensor accepts both the far-field signal and near-field noise with equally sensitivity. The primary sensor feeds into the primary channel of the adaptive filter. The adaptive filter system subtracts the noise in the reference channel from the signal-plus-noise in the primary channel, thus producing an output having a greatly improved signal-to-noise ratio.

Abstract: A piezoelectric polymer hydrophone including a single flexible sheet of a ezoelectric polymer having a plurality of electrode strips on the top and bottom of the sheet. The electrode strips at the top are staggered by one half the width of a strip relative to the corresponding strips at the bottom of the sheet. The polymer sheet can be rolled into a helix without losing its acoustic sensitivity.

Abstract: A direction-finding array system which uses a plurality of hydrophones in a rossed dipole configuration and a phase-detection system. It is basically a time-of-arrival (TOA) system which is modified to act like a phase-detection system and is able to share much of the electronics of existing acoustic intercept receivers. Acoustic signals of a high frequency generated by an acoustic target under investigation are apparently heterodyned to obtain corresponding signals of an appropriate lower frequency. The apparently heterodyned signals are then processed in two identical processors giving rise to two outputs which are applied to X- and Y- axes of a cathode ray of oscilloscope or the like to obtain unambiguous bearing information about the acoustic target. Three dimensional bearing angle information is obtained by using a third processor which is identical to the two processors used in a two dimensional case.

Abstract: The winder includes pairs of rotatable chucks each supporting one or more bobbins. The two chucks of each pair include a top chuck and a bottom chuck operatively associated with a common drive roll, although the chucks may be driven otherwise. A traverse housing extends parallel to the chucks and has respective traverse guides for each bobbin. A yarn pickup or pusher is mounted on the housing for displacement longitudinally thereof by a cable cylinder. A respective yarn transfer device is associated with each chuck for swinging about the axis of the chuck between the retracted position and a yarn transfer position. Each device includes a bar or tube extending parallel to the associated chuck throughout substantially its entire length. While yarn packages are being wound at high speed on one chuck of each pair, the other chuck is in a retracted standby position.

Abstract: The yarn to be transferred is fed at high speed through a traverse mechanism and between a drive roll and a bobbin mounted on a first chuck and rotated by the drive roll to cross-wind a yarn package. An empty bobbin is mounted on a second chuck parallel to the first chuck. When the package is substantially full wound, the empty bobbin is engaged with the drive roll and the yarn package is retracted to provide a clearance space between the package and the drive roll. A transfer rod on the free end of an arm pivoted on the traverse mechanism, and extending parallel to the drive roll, is swung through the clearance space to engage the yarn and draw a loop to toward the rotating empty bobbin, and the package is then reengaged by the drive roll for continued high speed rotation to maintain tension on the drawn loop while the transfer rod draws the yarn loop against and beyond the empty bobbin.

Abstract: The mechanism provides for winding much larger yarn packages of each of a pair of vertically spaced chucks on one side of a common drive roll and displaceable alternately horizontally into engagement with the drive roll for winding of yarn packages on bobbins on the chucks. A belt is trained around the drive roll and around an adjustably mounted small diameter pulley located between the two chucks. When a package has begun to be wound on a bobbin on one chuck by rotation by the common drive roll, the other chuck is moved inwardly, from a retracted position, past the partially wound package to a standby position in which it is adjacent but out of contact with the belt. As the package nears completion, the standby chuck is engaged with the "soft" part of the belt, between the drive roll and the pulley, and accelerated to bring its peripheral velocity into substantial synchronism with that of the drive roll.

Abstract: The device provides for winding much larger yarn packages on each of a pair of vertically spaced yarn winder chucks on one side of a common drive roll and displaceable alternately in respective slots of a front wall of the yarn winder into engagement with the drive roll for winding of yarn packages and bobbins on the chucks. An adjustable length arm is swingably mounted, through an anti-friction bearing, on a motor drive shaft extending through the front wall midway between the chuck slots and outwardly of the retracted positions of the chucks, and a small diameter pulley is rotatably mounted on the free end of the arm. A larger diameter pulley is fixed to the drive shaft, and a belt is trained around both pulleys. A pair of solenoids, having armatures spring biased outwardly, are aligned in opposition and their armatures engage a fin projecting from the pivot end of the arm to bias the arm to a neutral position in which the belt is out of the paths of movement of the chucks.

Abstract: A drive roll has an axis of rotation and at least two rotatable chucks are provided, each being adapted to have a yarn package formed thereon. The chucks each have an axial end and are movable into and out of driven engagement with the drive roll. A traversing arrangement traverses a running yarn which is being wound onto one of the chucks, in order to form a yarn package thereon. A yarn transfer arrangement effects automatic transfer of the running yarn from the one chuck upon forming of the yarn package thereon to the empty other chuck while the latter is in driven engagement with the drive roll. This arrangement includes an arm which is mounted on the drive roll to be turnable about the axis of rotation of the latter and which has a free end portion arranged to travel in a path adjacent the axial end of the other chuck and intersecting the axis of rotation of the other chuck while the same is in engagement with the drive roll.

Abstract: A device for the axial spacing of spool tubes along a common spool carrier, comprising a rotatable cylindrical spool carrier which has a periphery with a recess therein which accommodates a device which permits passage of a first spool tube over the carrier to a position at which the first spool tube abuts against a stop. The device thereafter projects outwardly from the periphery of the spool carrier behind the first spool tube so as to prevent the second spool tube placed on the carrier from moving further toward the first spool tube and thereby maintains a spacing between the two spool tubes. The spool carrier also carries a recess in the periphery thereof at the location between the two spool tubes which comprises a means for catching the thread which is to be wound.

Abstract: A drive roll has an axis of rotation and at least two rotatable chucks are provided, each being adapted to have a yarn package formed thereon. The chucks each have an axial end and are movable into and out of driven engagement with the drive roll. A traversing arrangement traverses a running yarn which is being wound onto one of the chucks, in order to form a yarn package thereon. A yarn transfer arrangement effects automatic transfer of the running yarn from the one chuck upon forming of the yarn package thereon to the empty other chuck while the latter is in driven engagement with the drive roll. This arrangement includes an arm which is mounted on the drive roll to be turnable about the axis of rotation of the latter and which has a free end portion arranged to travel in a path adjacent the axial end of the other chuck and intersecting the axis of rotation of the other chuck while the same is in engagement with the drive roll.

Abstract: A fixed electrical network, in conjunction with an amplifier having varia output impedance, is used to provide each of the transducer elements of an array with a reactance which acts as a large shunt reactance when the amplifier acts as a constant current source, but which acts as a smaller series reactance when the amplifier acts as a constant voltage source. Consequently, the usable bandwidth of the array is greatly increased, without degrading its performance.