Abstract: A receiver comprises a carrier tracking loop (CTL), a filter, a look-up table and a rotator The CTL provides a base-band signal having in-phase and quadrature signal components. The filter provides a DC-offset level associated with each component to the look-up table, which, in response thereto, provides a phase adjustment signal to the rotator The latter then rotates the baseband signal as a function of the phase adjustment signal for correcting for carrier phase ambiguity.

Abstract: An ATSC (Advanced Television Systems Committee) VSB (Vestigial Sideband) receiver includes a carrier tracking loop (CTL) for processing a received ATSC VSB signal and a CTL lock detector. The CTL lock detector includes an averaging filter for averaging the down-converted received ATSC VSB signal to provide a DC offset, an estimator for providing an estimate of the DC offset, and a comparator for providing a lock signal as a function of a comparison between the estimate of the DC offset and the DC offset, wherein the lock signal is representative of either a locked condition or an unlocked condition of the CTL.

Abstract: An NTSC (National Television Systems Committee) co-channel interference detector includes at least a carrier tracking loop, peak detector and a D/U (Desired-to-Undesired) signal power ratio estimator. The carrier tracking loop provides a tracking signal representative of the possible presence of a video carrier of an interfering NTSC video signal while the peak detector provides peak data derived from the tracking signal to the D/U signal power ratio estimator. The latter provides, as a function of the peak data, an estimate of a D/U signal power ratio with respect to a desired ATSC (Advanced Television Systems Committee) co-channel signal.

Abstract: A system for processing a television signal including a data component, such as extended data services data, includes a decoder for processing the data component to provide data representing time information. A control device responds to the data for modifying time information, e.g., time of day, that is maintained in the system. The time information decoded from the video signal is compared to the time information maintained in the system to determine a time difference. If the time difference is in a predetermined range, the time difference indicates that the time information from the television signal is invalid. The control device responds to the time difference being in the predetermined range by preventing modification of the time information maintained in the system. A user may provide an input via a device such as a remote control to control the manner in which the control device responds to the time difference.

Abstract: A television receiver includes a decoder for decoding a data component of a television signal, such as extended data services (EDS) data. The data component includes data representative of time of day information. A controller in the receiver processes the time of day information to set the time of day stored in the television receiver to a time value that is accurate to seconds.

Abstract: To accomplish automatic error correction in an electronics instrument, the instrument includes a controller, coupled to at least one peripheral unit via a communications bus for bidirectional communication with the peripheral unit, coupled to a memory circuit for storing data indicative of the operational status of the peripheral unit, and coupled to a power supply which supplies power to the peripheral unit. The controller reads the operational status data from the peripheral unit and upon detection of an error condition, writes data indicative of status to the memory circuit and causes a removal of power, for a predetermined time, from said peripheral unit, followed by the reapplication of the power. The power supplies themselves are also monitored and, in the event of a detected error in power supply output, the power supply is turned off and turned on in an attempt to clear the problem.