Abstract: The present invention provides an apparatus and method for facilitating debugging of sequences of processing instructions. The apparatus comprises a processing circuit for executing processing instructions, the processing circuit having multiple states of operation, with each state of operation being assigned a context identifier to identify the state of operation. Further, logic is provided for facilitating debugging of sequences of processing instructions executed by the processing circuit. The logic comprises control logic, responsive to control parameters, to perform predetermined actions to facilitate debugging, and triggering logic for generating the control parameters dependent on data received from the processing circuit indicative of the processing being performed by the processing circuit.

Abstract: A subscriber's telephone installation comprises a plurality of telephone sets coupled in parallel to a subscriber loop so as to provide a voice facility, and a data modern coupled to the subscriber loop so as to provide data facilities at a frequency above that employed for said voice facility. Some or preferably all telephone sets are provided with a respective filter arrangement incorporating series connected inductive and parallel connected capacitive elements for rejecting selected frequencies from the telephone set. The filter also incorporates a switch responsive to current drawn from the line for selectively enabling and disabling the filter arrangement when the telephone set is respectively in its off-hook condition or in its on-hook condition.

Abstract: A splitter separates telephony traffic (POTS) from digital subscriber line (ADSL) traffic occupying a higher frequency band. The splitter comprises a low-pass filter for passing the telephony traffic, the low-pass filter being operable to vary its filtering response between a first low-pass response for use during telephony speech traffic, and a second, more restrictive, low-pass response for use during at least part of the time that telephony signalling traffic is present. During speech traffic a filter is used which provides a good impedance match with a telephony terminal or linecard so as to minimize detrimental effects on sidetone and echo performance which may impair a user's speech quality. The filter response can be varied according to a detected property of the telephony traffic, such as amplitude or rate of change of amplitude of the traffic.

Abstract: An integrated circuit (14) is provided with a tracing mechanism (10, 12) that is responsive to data access misses to insert a data place holder (32) within a stream of trace data. When the missed data is later returned, this is inserted into the stream of traced data as a late data value (44). Analysis of the stream of trace data may subsequently correlate between instructions that gave rise to data misses and the late data that was subsequently returned.

Abstract: To facilitate the use of relatively high frequency data transmission services over a wireline communication resource originally deployed to support low frequency voice band services, an assessment of the wireline communication resource (50-52) is based on attenuation of high frequency test signals, of known original level, that are generated (18) injected into the wireline communication resource from a test point (12). A detector (60) at a potential point of service, e.g. at a customers' premises (14), detects an attenuated level of the test signals and generates a control signal (70, 82), such as a drive current, indicative of the attenuation caused by the wireline communication resource (50-52). The control signal (70, 82) is then indirectly communicated back to the test point (12) in a coded form, and preferably within a voice band transmission.

Abstract: A frequency adjusting arrangement is disclosed whereby the frequency of a local oscillator, incorporating an Yttrium-Iron-Garnet filter as the frequency determining element, is controlled to follow a coded waveform having a bandwidth wider than the bandwidth of the circuit in which such filter is used.

Abstract: Circuitry for adjusting the resonant frequency of an Yttrium-Iron-Garnet (YIG) filter in the first local oscillator of a receiver carried on a guided missile is shown to include the combination of a crystal oscillator which produces a pilot signal for tuning the YIG filter to a corresponding resonant frequency and a frequency adjusting arrangement for offsetting the resonant frequency of the YIG filter by a predetermined amount.

Abstract: The present invention pertains to a method for determining if data read from a storage medium has been read from physical block address (PBA) other than the expected PBA. Data that is stored on the data storage medium is encoded in accordance with a protocol that includes randomizing the data and combining the first k.times.2t bytes of the data with a PBA string, where t is the error correction capacity associated with the error correction technique used in the data storage system and k is the number of bytes of the PBA that are used in the PBA string. In addition, the data is k-way interleaved with parity data appended to it. When the data is read from the data storage medium, the data is decoded using a scheme corresponding to the encoding protocol. If errors are present in the data and exceed the error correction capacity, the first 2t bytes of each interleave are marked as erasures and a second correction is performed by an error correction unit.

Abstract: To avoid spurious energy radiation from a wireline communication resource (42-44) supporting data over voice, such as in xDSL, modems (40, 46) supporting a multi-carrier transmission scheme undertake a line balance assessment (136-138) for each sub-channel carrier within the system. Specifically, an addressed modem (40) measures, for example, the signal to noise ratio of a differential transmission mode and a common transmission mode to provide the balance assessment (138). More particularly, a receive chain in the addressed modem is selectively switched (84) to receive the differential mode as appearing across the terminals of an isolation transformer (66) or the common mode (as seen with respect to ground) from a center tap (88) in a line-side winding (70) of the isolation transformer (66). Any sub-channel carrier that fails to provide a predetermined level of balance (140) is de-selected (141) by the modem and not used for traffic.

Abstract: An electrical contact avoidance device comprises an inductor plate directly or capacitively coupled to the user and coupled to a detector circuit which derives a DC signal corresponding to a voltage induced in the user's body by a radiated high voltage electrostatic field. A comparator compares the DC signal with a reference signal representing the potential difference between the inductor and reference plates, and activates an alarm if the detected signal exceeds a preselected reference level.

Abstract: Windings for magnetic core devices are preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs may be substantially less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots. A plurality of such windings are stacked, one on top of the other, or interleaved or placed on torroidal core with flexible orientation of the tabs being available to facilitate access to each of multiple terminals and to isolate or group electrical functions.

Abstract: A winding for a magnetic core is preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated integral tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs is less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots.

Abstract: Windings for magnetic core devices are preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs may be substantially less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots. A plurality of such windings are stacked, one on top of the other, or interleaved or placed on torroidal core with flexible orientation of the tabs being available to facilitate access to each of multiple terminals and to isolate or group electrical functions.

Abstract: The invention comprises apparatus for forming nelical coils from conductive strip metal, counting the turns and cutting them to separate the turns into coils of desired numbers of turns, annealing the coils, tabbing the ends thereof, coating the coils with insulative coating and curing the coating by baking; compressing the so-insulated coils under extreme pressure to comprise a helical coil product, per se, or to fit conventional cores to comprise an inductor product.

Abstract: Automatic control circuitry for maintaining the frequency of a first local oscillator in a radar receiver at a predetermined offset frequency with respect to the frequency of either transmitted signals from a radar transmitter or echo signals from a target is disclosed. The disclosed circuitry operates as a discriminator when the frequency of the first local oscillator is different from the predetermined offset frequency and as a "phase lock" loop when the frequency of the first local oscillator is the same as the predetermined offset frequency.

Abstract: An improved automatic frequency control arrangement for a missile-borne inverse receiver is shown to include a reference oscillator and a voltage-controlled oscillator with control means for the latter, such means including a frequency-to-voltage converter responsive to the difference frequency between the two oscillators so that the latter may produce a signal representative of the Doppler shift frequency of a target. A starting circuit is also shown to ensure that the frequency of the reference oscillator is always lower than the frequency of the voltage-controlled oscillator.

Abstract: An improved automatic frequency control arrangement for a missile-borne inverse receiver is shown to include a reference oscillator and a voltage-controlled oscillator with control means for the latter, such means including a frequency-to-voltage converter responsive to the difference frequency between the two oscillators so that the latter may produce a signal representative of the Doppler shift frequency of a target. A starting circuit is also shown to ensure that the frequency of the reference oscillator is always lower than the frequency of the voltage-controlled oscillator.

Abstract: Circuitry for compensating for the effects of changes in ambient temperature on an automatic gain control arrangement in a missile-borne receiver is shown to include an operational amplifier responsive only to the level of the output signal from an automatic gain detector and amplifier, such end being effected by using temperature sensitive elements in the input and feedback circuits of the operational amplifier.

Abstract: A pile sizer for reducing the lateral extent or diameter of the upper end of a submerged pile. A vertically extending elongated anchor rod is threadedly secured to the upper end of the submerged pile along the central axis of the latter and an elongated tube is swingably secured to said anchor rod by arms to permit orbital movement of said tube about the centerline of the pile. An elongated shaft is rotatably supported within the tube and is formed with a milling cutter at its lower end for cutting the pile and is connected at its upper end to a motor mounted on the upper end of the tube. The operation of sizing the pile to a predetermined diameter can thus be performed from above the water line.