There is disclosed a phase lock loop including an oscillating sub-loop which provides a sweep signal for the voltage controlled oscillator of the main loop so as to bring the main loop into its lock-in range. The sub-loop is coupled between the phase comparator and voltage controlled oscillator of the main loop in such a way that whether the sub-loop oscillates or does not oscillate is directly controlled by the out-of-lock and in-lock conditions of the main loop, respectively.

A loop controller for a time division multiplexed loop communications system. The loop controller is connected in series with a plurality of data processors in a loop configuration. The loop controller provides a certain number of time slots in a frame. The data processors communicate with each other in channels comprising two time slots. Each data processor must acquire the same channel in each frame. The loop controller provides an adaptive delay function such that the total delay around the l...

A loop material for a hook and loop fastening system composed of: 1) a backing material; and 2) a layer of a nonwoven spunbond web attached to the backing material, the nonwoven spunbond web comprising a plurality of continuous intertwined filaments, each having a diameter of about 25 to about 100 microns, the plurality of filaments laid randomly to define a plurality of intertwined loop springs, each having a diameter of about 0.5 to about 3 millimeters.

A servo control loop for a disc player initially sets an offset value, which is used throughout search and playback to control the gain of an equalizer in the servo loop. The offset value is determined by first moving a pickup head to radially central position of the disc and reading the time code address data recorded at that position. The read address is compared with a calculated, expected address to determine if the two are within a given distance. If they are, the offset is set as a predete...

A method of setting the loop gain of a tracking servo loop of a disc player. The optimum loop gain is set for each playing of a disc without being influenced by disc eccentricity. The servo loop is opened, the disc is driven at a revolving speed which is lower than that of normal playback at the current position of the information reading spot, and a tracking error signal is obtained. The loop gain is set on the basis of a plurality of the sample values.

A loop filter for a phase locked loop system having a voltage controlled oscillator (VCO), a divide-by-N circuit responsive to the output of the VCO, and an edge sensitive phase/frequency comparator responsive to the output of the divide-by-N circuit and a reference timing signal for providing a first control signal when the output of the divide-by-N circuit lags the reference timing signal or a second control signal when the output of the divide-by-N circuit leads the reference signal. The loop...

Phase-locked loop having a controllable oscillator and a phase detector for generating an output signal which is applied as control signal to the oscillator through a loop filter comprising a storage element, which loop filter is switchable under the control of a control circuit between a first state wherein the loop filter has a wide passband and a second state wherein the loop filter has a narrow passband, provided with an arrangement connected to said storage element for determining the insta...

An electrical wiring device is provided combining a strip gauge, a loop forming gauge and a wire-restraint which are coordinated to form a loop in a bare end of a solid insulated conductor wire at a location where insulation on the wire extends into the wire-restraint when the loop is secured under a terminal binding screw. The stripping gauge comprises a marking molded on the device and indicating the length of insulation to be removed from the wire prior to forming the loop in the bare end of ...

A phase lock loop circuit comprising a charge pump circuit (13), a loop filter (14), and a voltage controlled oscillator (15), a subsidiary loop filter (20) connected to the charge pump circuit and the loop filter in a phase lock operation through first and second switching circuits (21) and (22). The loop filter comprises a filter capacitor (C1) and delivers a filtered signal to the voltage controlled oscillator. In the phase lock operation, the subsidiary loop filter reduces a charge duration ...

A method for setting the loop gain in a focusing servo loop of a disc player. The loop is opened and the objective lens is moved repeatedly up and down about the focusing point while the disc is slowly rotated, thereby generating an S-shaped focusing error curve. The S-shaped error curve is sampled and a loop gain is determined based on the sampled values. If an eject instruction occurs during the loop gain setting process, a braking pulse is applied to a spindle motor for stopping the disc rota...