Abstract: An apparatus is disclosed for generating a burst-locked, color subcarrier representative signal .phi..sub.sc from a skew-corrected clock signal MCS (which is reset once every horizontal line) and a skew error signal SES (indicative of the once-a-line phase adjustment of the skew-corrected clock signal). In accordance with another feature of the invention, a chroma demodulation apparatus is provided for generating a pair of color difference signals R-Y and B-Y in response to the internally-generated .phi..sub.sc signal.
Abstract: When a positive or a negative overflow error condition is encountered, the present invention substitutes the most positive or most negative value for the erroneous sample. The sign bit of a potentially erroneous value is inverted to form the MSB of the substitute value, and this value is, in turn, inverted and expanded to form the n-l LSB's of the substitute value. If an overflow error condition is detected, the erroneous value is replaced by the substitute value.
Abstract: A memory-based television receiver includes an apparatus for generating a composite sync signal CSS for timing the memory reading operation and the deflection circuits of the receiver. The horizontal sync components of the internally-generated composite sync signal are locked to the system clock. The vertical sync components of the internally-generated composite sync signal are, on the other hand, locked to the vertical sync components of the incoming video signal.
Abstract: An angle .alpha. from 0.degree. to 45.degree. is determined from an equation .alpha..degree.=LK.iota.(tan .alpha.).sup..iota., where .iota. is an index varying from 0 to n. The value of tan .alpha. is arrived at by dividing the smaller of the I,Q magnitude values by the larger of the two magnitude values. The angle .alpha. from 0.degree. to 45.degree. is transposed to the corresponding phase angle .theta. of the vector sum C of the orthogonal I,Q signals over the full range of values from 0.degree. to 360.degree..
Abstract: A single pole double throw rotary switch includes a non-conductive terminal board. A washer-like wiper element is rotatably secured to the terminal board by a tubular rivet. An outwardly extending portion of the wiper element selectively engages one of a pair of output terminals. When the wiper element occupies a midrange position, the rotary switch is electrically open. A non-conductive actuating member is rotatably mounted on the terminal board for positioning the wiper element.
Abstract: A frame comb filter includes a pair of serially-connected field memories. In the normal display mode, the first field memory stores one field of incoming composite video signal CVS and provides a field delayed video signal FDS. The second field memory stores one field of the field delayed video signal FDS and provides a frame delayed video signal FRS2. The incoming composite video signal CVS is combined with the frame delayed video signal FRS2 to generate a Y/C separated component luma signal CLS. In the zoom processing mode, the first field memory stores two fields or one frame of incoming composite video signal corresponding to the zoomed portion of the input image, and provides a frame delayed composite video signal FRS1 at its output. The incoming composite video signal CVS is combined with the frame delayed video signal FRS1 representative of the zoomed portion to produce a Y/C separated component luma signal CLS for the zoomed portion.
Abstract: A combination frame comb/freeze frame apparatus is disclosed. In the normal mode, the apparatus serves to separate one of the component signals (luma or chroma) from a composite video signal. In the freeze frame mode, the separated component signal is stored in the frame store, and repeatedly read out and displayed on the TV screen.
Abstract: As the 8-bit input signal applied to a threshold device reaches a first threshold level, the 1-bit output signal changes from a logical zero to a logical one. The 1-bit output signal is delayed by one system clock period and fed back. The delayed 1-bit output signal is combined (e.g., merged or added) with the 8-bit input signal, and the resulting signal is applied to the threshold device to provide a hysteresis feature. Once the delayed 1-bit output signal becomes a logical one, the input signal has to drop below a second, lower threshold level before the 1-bit output signal can revert back to a logical zero, whereby a margin of noise immunity is provided.
Abstract: Integrally-molded with a plastic TV cabinet is a collapsible holding member. When a PCB is mounted on the TV cabinet at an assembly station, the collapsible holding member squeezes through an aperture in the PCB to temporarily secure the PCB to the TV cabinet. The partially-installed product is then moved to a screw driving station, where the PCB is permanently screwed to the TV cabinet.
Abstract: The back cover of a TV cabinet is provided with a J-shaped latch member for releasable reception in a slot disposed in the cabinet front during cabinet assembly. The back cover is equipped with a window for providing access to the latch member, so that a tool can be inserted into the cabinet enclosure through the slot to release the latch member. The cabinet front is provided with a partition surrounding the latch member to prevent inadvertent insertion of a tool into the cabinet enclosure beyond the partition.
March 17, 1986
Date of Patent:
May 5, 1987
Robert J. Ramspacher, William J. Bachman, Franklin R. DiMeo
Abstract: A television receiver is arranged to selectively display images from several input signal sources--such as pix-in-pix, teletext, computer graphics, besides displaying pictures from the normal off-the-air television signal. In accordance with this invention, clamping circuits are provided for establishing a constant black image reference level for all the input signals.
Abstract: The printed circuit board (PCB) is provided with a plurality of square connector stakes, which are pressed into the respective holes disposed in the PCB. The connector stake holes are arranged on the PCB such that a conductive pad encircles each of the connector holes. The connector holes have a cross-section that provides the required mechanical interference between the connector stakes and the connector holes to hold the stakes in place prior to soldering. At the same time, the walls of the holes are configured to limit the flux from migrating to the upper portions of the connector stakes during the wave soldering operation.
Abstract: The television cabinet comprises of a cabinet front, a back cover and a chassis frame. When the back cover is secured to the cabinet front with the chassis frame interposed therebetween, the members define an enclosure for housing the picture tube and the electronics. The exterior surfaces of the cabinet front, back cover and the chassis frame form the exterior walls of the cabinet upon assembly of the members, with the chassis frame spaced inwardly from the leg portions of the cabinet front and the back cover supporting the cabinet.
Abstract: A snap-together latch mechanism for a television cabinet consists of at least one pair of oppositely-disposed, flexible latch fingers secured to the cabinet front and a corresponding number of oppositely-disposed, rigid stops disposed on the back cover. To attach the back cover, it is simply aligned with the cabinet front and inserted to lock it in place.
Abstract: A digital sample rate reduction apparatus receives an input signal occurring at a given sample rate and produces an output signal occurring at a rate which is two-thirds the input sample rate. One half of the output samples are interpolated samples and the other half are original input samples.
Abstract: This circuit provides a digital output indicating the presence or absence of the infrared (IR) carrier signal. The incoming IR signal is sampled by a clock at a frequency which is about 4 times the carrier frequency. The high and low samples are tabulated in two counters in a race. When 8 high or 16 low samples are counted, the envelope status flip flop is set or reset, respectively, and both counters are reset. The output of the envelope status flip flop represents the envelope of the IR carrier signal.
Abstract: The log encoder includes means for determining a number r corresponding to the position of the most significant one in the respective input samples, and generating an equivalent binary value. To the binary value is added a predetermined value when the input samples are non-zero to generate m-bit binary values representing the m most significant bits of the output samples in the log domain. The log encoder further includes means for generating l-bit binary values corresponding to the bits to the right of the most significant one in the input samples. The m-bit binary values are concatenated with the l-bit binary values as the most and least significant bits, which concatenated values represent the output samples in the log domain. The process is essentially reversed to convert the binary values in the log domain back into the non-log domain.
Abstract: A flash analog-to-digital (A/D) converter includes a plurality of comparators, each of which is arranged to be alternately coupled with the input signal and the respective one of a plurality of reference voltages in order to find the closest match therebetween. The output of the comparators is fed to a programmable logic array (PLA) for determining a binary number related to the particular value of the input signal. Pursuant to this invention, the input signal is continuously tracked, and in dependence upon whether the input signal is above or below the midpoint reference potential, a predetermined potential, instead of the input signal, is applied to particular groups of comparators.
Abstract: An apparatus is provided for thermoforming a plurality of protrusions in a plastic sheet. The thermoforming apparatus comprises a pneumatic press having a pair of male and female die plates with respective projections and cavities. One of the die plates is heated. The other die plate is cooled. The cooled die plate is provided with vacuum to ensure that the thermoformed plastic sheet is held against the cooled die plate upon the opening of the press to, in turn, ensure the cooling of the plastic sheet prior to its removal.