Rca Inc.

Other

Samsung Electronics Co., Ltd.

Rca Licensing Corporation

Thomas V Bolger

Henry G Lewis, Jr

Allen LeRoy Limberg

Robert A Dischert

Danny Chin

Eric P Batterman

Robert L Libbey

David Thomas Bolger

Jiang Yang

According to some embodiments, a musical instrument pickup comprises a first plurality of non-magnetic pole pieces a second plurality of non-magnetic pole pieces, a plurality of magnetic pole pieces, a first coil disposed around the first plurality of non-magnetic pole pieces, a second coil disposed around the second plurality of non-magnetic pole pieces and the plurality of magnetic pole pieces, and a bar magnet magnetically coupled to the first plurality of non-magnetic pole pieces and the second plurality of non-magnetic pole pieces.

Musical instrument pickup

Digital signal receivers for detecting BPSK modulation of a suppressed carrier transmitted through the same channel as an analog television signal are described, in which the detected BPSK is digitized with an oversampling analog-to-digital converter prior to digital comb filtering for separating the BPSK from interfering analog television signal remnants. This is done to get an increased number of bits resolution from a relatively inexpensive flash converter so that the BPSK, which is of relatively low amplitude compared to maximally interfering analog television signal remnants, is not overwhelmed by quantizing noise. The oversampling analog-to-digital converter can be of sigma-delta type.

Receiver with oversampling analog-to-digital conversion for digital

A video display apparatus convergence and correction arrangement includes a digital signal delay circuit which uses a sample interpolation technique to provide apparent signal delays corresponding to fractional parts of whole sample periods. Adjacent digital samples are combined using fractional coefficients that sum to unity. The selection of the fractional coefficients determines the size of the smallest delay increment. The number of whole sample delay periods as well as the initial fractional coefficients for a given horizontal scan line are provided by information that is stored in a memory device during assembly or alignment of the video display apparatus.

Digital video delay by sample interpolation

A progressive scan video display apparatus incorporates beam landing error correction circuitry. Beam landing error correction may be accomplished prior or subsequent to video information interpolation and prior or subsequent to video information speedup. The correction circuits utilize sample interpolation techniques to provide accurate beam landing error correction for each of the red, green and blue video information signals.

Raster distortion correction for progressive scan television system

A chroma overload system includes an up/down counter to develop a chroma gain/attenuation signal. Overload conditions are detected and responsive thereto pulses are generated to cause the counter to decrease chroma gain. In the absence of overload conditions, a pulse generator conditions the up/down counter to increase chroma gain to a predetermined limit. ACC is incorporated by monitoring burst and establishing the counting range and thereby the range of gain developed by the up/down counter.

Chroma signal amplitude control apparatus

A digital TV receiver is disclosed which displays the image for an auxiliary channel as an inset in the image for a main channel. The asynchronous composite video signals of the main and auxiliary channels are time division multiplexed, one line of auxiliary signal for every three lines of main signal. The chrominance and luminance components of the main channel signal are separated by an adaptive comb filter. A low-pass filter removes the luminance vertical detail components from the combed main channel chrominance and also separates the luminance components from the chrominance components for the auxiliary signal. These asynchronous time division mutliplexed chrominance signals are processed by circuitry which corrects the chrominance phase of each of the signals to be relative to a single reference phase and then separates the two quadrature modulated color difference signals. The auxiliary channel luminance and color difference signals are subsampled and stored in a memory for display as an inset. The main channel samples are stored in a one-line memory as they are written. Stored lines are displayed a second time, when auxiliary channel signals are being processed, to provide a continuous main channel image.

Apparatus for processing multiple time division multiplexed asynchronous

Circuitry corrects vertical beam landing errors for color cathode ray tubes. A digital delay circuit provides horizontal scan line video pixel information at its proper location to produce a distortion corrected raster. Accurate correction is provided by a combination of scan line offset between the input and output video signals and by sample interpolation techniques that effectively form derived pixels that have an apparent location of the derived pixel relative to the sample video pixels is determined by the selection of the interpolating coefficients.

Digital vertical beam landing correction circuit

In a color television receiver in which video signals are processed in digital form, the rate at which the digital video samples are supplied to a digital-to-analog converter arrangement is varied in a predetermined manner to produce a display that is substantially free of raster distortion. The digital video samples are first entered into a digital store such as a FIFO and then read out of the FIFO by a selected one of four read clocks. The read clocks are of the same frequency but of different phase. By selecting different read clocks to apply to the digital store, the rate at which the store reads out the digital samples is varied.

Digital video processing system with raster distortion correction

A digital signal processing apparatus includes a digital coring circuit removing samples of digital input signals in a range determined by a digital threshold level signal. The threshold level signal developed by a coring control device is controllable according to the results of comparing at least a portion of the digital input signals to a digital reference level. In a television receiver having digital signal processing circuitry, for example, the coring range is decreased as the luminance signal level increases towards a brighter picture level and is increased as the luminance signal level decreases towards a darker picture level.

Digital signal coring apparatus with controllable coring threshold level

In a digital signal processing system, an analog-to-digital converter producing digital representations of an analog signal is dithered to increase its apparent quantizing resolution. Certain processing of the digital signals, however, can result in the loss of the dither information, because of either the form of digital filtering employed or the number of bits of the digital signals processed. To avoid the effects of such loss, the least significant bit of the digital signals is delayed and is applied to an analog output device to reintroduce a dither signal thereat having a magnitude substantially equivalent to that of the lost bit. The present invention is useful in processing digital television signals in a television receiver having a digital signal processing section.

Digital signal processing apparatus for processing dithered digital

The quantizing resolution of an analog-to-digital converter is effectively enhanced for sinusoidal input signals by (a) sampling the signal at 90 degree intervals of the sinusoid; (b) establishing the input range of the converter to be less than the dynamic range of the signal but arranged so that at least three of four successive samples are true or correct values; (c) detecting the occurrence of saturated fourth sample values; (d) calculating correct values for saturated sample values from preceding samples; and (e) substituting calculated values for saturated incorrect values.

Analog-to-digital conversion apparatus including a circuit to substitute

A digital TV receiver having an analog-to-digital converter which generates digital representations of the analog signal asynchronously relative to the color burst reference, includes open loop circuitry for correcting the values of the chrominance component to comport with chrominance samples having a fixed phase relationship with burst. During the burst interval the angle of the chrominance phasor relative to the asynchronous sampling instants is compared with a fixed angular reference value to generate a correction factor for the respective line of video signal. The correction factor is thereafter combined with the chrominance samples to generate new chrominance samples having a desired phase relationship with the phase of the burst reference signal.

Digital video signal processing system using asynchronous a-to-d encoding

A phase measuring arrangement for sampled signals changes the phase of the sampling signal in fine phase increments while comparing the magnitudes of the signal samples so produced to determine whether they have magnitudes within a given range of values. The range of values is indicative of a known phase angle. The number of magnitudes falling within the given range is indicative of the phase of the sampled signal relative to the known phase angle. Embodiments are disclosed in which such phase measuring arrangement is employed in a phase-locked loop useful for processing chrominance signals in a television receiver.

Digital signal phase measuring apparatus as for a phase-locked loop

A digital signal peaking apparatus combines input digital signals with filtered and scaled representations thereof to produce controllably peaked digital signals. A digital filter produces the relatively higher frequency components of the input digital signals which are controllably scaled by a digital multiplier in accordance with a multiplier coefficient. A control arrangement develops the multiplier coefficient having a value determined in accordance with the peak magnitude of the higher frequency components of the input digital signals relative to the value of a peaking control level signal.

Digital signal peaking apparatus with controllable peaking level

Apparatus providing a magnified picture display for a television receiver employs a reduced-size digital memory which stores only the digitized video signal components necessary to generate video signals to produce the magnified picture display. A simplified user-controlled picture positioning arrangement generates write and read addressing signals for the digital memory representative of both the picture area of the magnified picture display and of the normal picture display therein which is to be magnified. Writing of the digitized video signal components of the normal picture display into the digital memory is accomplished in 'real time' whereas reading of the stored data from the memory and signal processing to develop interpolated digitized video signal components of the magnified picture is accomplished at a reduced processing rate on a line-by-line basis in between memory write cycles. User selection of discrete degrees of magnification and of freeze-frame (still) or continuously-updated (essentially real-time) displays is provided.

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Merchantville, NJ, United States of America

Thomas V Bolger