Patents Examined by Richard Murray
  • Patent number: 4577217
    Abstract: An encoding circuit for a SECAM color television transmission, comprising a frequency-modulatable oscillator for a modulating signal which comprises two line-sequential color difference signals, the circuit also comprising a control loop for making the quiescent frequencies in the generated frequency-modulated signal substantially equal to reference frequencies. For this purpose the control loop comprises a multiplexer, a frequency demodulator and two control paths each having two sample- and -hold circuits. The sequence of the signals conveyed by the multiplexer and the time position of the measuring intervals are chosen such that at least a line scan period is located between the quiescent frequency-measuring interval and the reference frequency-measuring interval.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: March 18, 1986
    Assignee: U.S. Philips Corporation
    Inventors: Henricus W. G. Haenen, Antonie van Leeuwen
  • Patent number: 4568963
    Abstract: A signal converter for a color TV is used for converting a signal of the NTSC system, in which a subcarrier is quadrature-modulated by two chroma signal components, to a signal of the PAL system, in which a subcarrier is quadrature-modulated by two chroma signal components one of which two chroma signal components is inverted for each successive line, or vice versa. The signal converter includes a signal input terminal which receives an original signal having chroma signal components which are quadrature-modulated on a subcarrier having a frequency f1, a signal output terminal for producing a converted signal having chroma signal components which are quadrature-modulated on a subcarrier having a frequency f2 (where f1.noteq.
    Type: Grant
    Filed: March 17, 1983
    Date of Patent: February 4, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Tetsuro Sakai, Kazuhiko Honda
  • Patent number: 4567510
    Abstract: There is disclosed a solid-state color imaging apparatus which comprises an imaging device composed of a solid-state charge-coupled device having a plurality of cells each of which has at least two potential wells and a color filter having a combination of color filter elements which are positioned corresponding to the two potential wells in such a manner as to provide different spectral sensitivities to the two potential wells.
    Type: Grant
    Filed: May 20, 1985
    Date of Patent: January 28, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuyoshi Tanaka, Seiji Hashimoto, Tetsuro Kuwayama
  • Patent number: 4562457
    Abstract: A single compact multi-function video processing unit of a color video system has a sync generator for driving a video source and a video processor for providing video functions. A bus system interconnects the sync generator and video processor.
    Type: Grant
    Filed: December 23, 1982
    Date of Patent: December 31, 1985
    Assignee: Grumman Aerospace Corporation
    Inventor: Frank Salvia
  • Patent number: 4562460
    Abstract: A TV receiver arranged to process video signals in PCM binary format includes a manual hue control circuit which operates on the PCM color mixture signals to effectively rotate the vector sum of the color mixture signals while maintaining the magnitude of the sum substantially constant. The magnitude of the received vector sum is calculated and the angle between the sum and one of the color mixture signal components is determined. Circuitry under user control increments or decrements the angle to rotate the vector sum. Corrected color mixture signals are then generated by multiplying the magnitude of the calculated vector sum by the sine and cosine of the incremented angle.
    Type: Grant
    Filed: April 21, 1983
    Date of Patent: December 31, 1985
    Assignee: RCA Corporation
    Inventor: Leopold A. Harwood
  • Patent number: 4559553
    Abstract: The device comprises a generator of the current address of the signal appearing at the input of the device, a unit for sampling the signal received by the device and a comparator connected by an input to the output of the current address generator, another input of the comparator receiving the address of the signal which is to be acquired and the output of the comparator supplying a control signal for the sampling unit in order to authorize it to acquire the current signal present at the input of the device, when the address of the current signal is equal to the address of the signal which is to be acquired.
    Type: Grant
    Filed: March 16, 1983
    Date of Patent: December 17, 1985
    Assignee: Thomson-CSF
    Inventor: Luc P. van Cang
  • Patent number: 4559556
    Abstract: A viewing system is provided for viewing images with a three-dimensional effect, wherein the system is particularly adapted for viewing television images in full color. The viewing system comprises a filter mat having two juxtaposed polarizing filters for placement over a television viewing screen or other rear surface projection device in substantial registry with two similarly juxtaposed and slightly different images of a common scene or subject. The polarizing filters are oriented on different axes to polarize the light from the two images on different axes. The viewer observes these polarized images through eyeglasses having lens openings covered by polarizing lenses oriented with respect to the polarizing filters of the filter mat such that the two images are respectively observed by the viewer's right and left eyes.
    Type: Grant
    Filed: December 14, 1984
    Date of Patent: December 17, 1985
    Inventor: Vaughn D. Wilkins
  • Patent number: 4558350
    Abstract: A vector quantizer receives a plurality of input signals in block form and operates to determine an output vector having the least distortion with respect to an input vector by various techniques. A coded output or output vector codetable address is output from a coder of the device for receipt by a decoder which constructs a proper output vector signal.
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: December 10, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Tokumichi Murakami
  • Patent number: 4558353
    Abstract: A noise reducing circuit for reducing noise in a carrier chrominance signal comprises a bandpass filter supplied with an input carrier chrominance signal, where the bandpass filter has a narrow-band pass band of a center frequency equal to a chrominance subcarrier frequency of the input carrier chrominance signal, a first subtracting circuit supplied with the input carrier chrominance signal and an output signal of the bandpass filter, for carrying out subtraction between the two signals supplied thereto to obtain a noise signal component within the input carrier chrominance signal, an amplitude limiter for limiting the amplitude of an output signal of the first subtracting circuit, and a second subtracting circuit supplied with the input carrier chrominance signal and an output signal of the amplitude limiter, for carrying out subtraction between the two signals supplied thereto to produce a carrier chrominance signal reduced of the noise signal component.
    Type: Grant
    Filed: March 8, 1983
    Date of Patent: December 10, 1985
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Akira Hirota
  • Patent number: 4554576
    Abstract: A digital TV receiver includes circuitry for performing hue control by rotation of the axes of the I and Q color mixture signals. The I and Q color mixture signals are time division multiplexed and applied to a multiplicand input port of a multiplier circuit. The sines and cosines of the angle by which the I and Q vectors are to be rotated are also applied to the multiplier wherein alternate pairs of the I and Q signals are multiplied by the sine terms and intervening pairs of the I and Q signals are multiplied by cosine terms. The signal from the multiplier is applied to a delay element which delays successive samples by one sample period. Delayed and nondelayed signal samples are applied to an ADDER which produces the algebraic sums Icos .phi.+Qsin .phi. and Qcos .phi.-Isin .phi. corresponding to the desired modified I and Q signals respectively. The sums from the ADDER are demultiplexed by latches to generate separate I and Q signals.
    Type: Grant
    Filed: April 21, 1983
    Date of Patent: November 19, 1985
    Assignee: RCA Corporation
    Inventor: Yih-Sien Kao
  • Patent number: 4553176
    Abstract: Red, green, and blue signals from a video camera are separately recorded. In preparation for this, the three signals (advantageously generated at twenty-four frames per second and more than 655 noninterlaced raster lines per frame) are first applied to three separate low-pass filters, which pass up to at least eight and preferably more than fourteen megahertz. The filter output signals then frequency modulate three separate carriers, each of frequency at least two megahertz greater than the filter passband. The three frequency-modulated carriers are simultaneously recorded on parallel tracks. The three separately recorded FM carriers are subject to editing, traveling-matte combination with other triplets of carriers, and other special effects--while preserving wideband detail. The final three-track recording is used to generate a widescreen color film negative: The tracks can be conformed into a single monochrome video track, with each set of three color frames placed in sequence.
    Type: Grant
    Filed: December 31, 1981
    Date of Patent: November 12, 1985
    Inventor: James A. Mendrala
  • Patent number: 4553163
    Abstract: This integrated circuit contains the horizontal sweep generator (HO), the amplitude filter (AS), the sync-signal separating circuit (SA) and the frequency/phase comparator (FP). For the purpose of suppressing noise pulses which are caused via the operating voltage during the upper and the lower inversion point of the horizontal sweep generator (HO) which contains a single capacitor (C) and a first threshold stage circuit (SS1) with two fixed thresholds, there are provided a second and a third threshold stage circuit (SS2, SS3), to the inputs of which the sawtooth signal is applied, and with the thresholds thereof, approximately 2 .mu.s prior to reaching the upper or the lower peak value of the sawtooth signal, are being passed through thereby.
    Type: Grant
    Filed: February 27, 1985
    Date of Patent: November 12, 1985
    Assignee: ITT Industries, Inc.
    Inventor: Wolfgang Sauer
  • Patent number: 4551759
    Abstract: A video amplifier for a raw video signal permits increasing the gain of the ignal so that it stands out from background noise prior to processing. The amplifier uses a sample and hold circuit between two gain stages to permit the raw video signal to only be sampled at a preset rate. This type of device is especially suitable for charge coupled device video where sampling is desired after a predetermined integration time for the pixel elements of a CCD array. This processing permits low voltage level signals to be amplified relatively isolated from background noise and then processed after being amplified to a level significantly above processing noise. The final gain stage permits amplifying suitable for standard video monitors to use the signal.
    Type: Grant
    Filed: April 13, 1983
    Date of Patent: November 5, 1985
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Daniel L. Crabtree
  • Patent number: 4551748
    Abstract: A measuring head serving to determine both the color purity and the convergence in color TV picture tubes with a specially shaped diaphragm aperture, with the distance of the brightness sensors being adapted to the mutual spacing of the phosphor stripes, permits a wide positioning tolerance when placed in front of the screen of the picture tube. Moreover, to make the determination of the convergence more accurate, the output signal of the measuring head is such that it can be made independent of the influence of the intensity and of the time dependence of the brightness signals.
    Type: Grant
    Filed: February 16, 1983
    Date of Patent: November 5, 1985
    Assignee: International Standard Electric Corporation
    Inventor: Hans P. Mattle
  • Patent number: 4550338
    Abstract: A detecting circuit comprises a synchronous detecting circuit (11, 12, 15 to 19, 22 and 27 to 29) and a switching transistor (35). The collector and the emitter of the transistor (35) are connected to junctions (A) and (B), respectively, of the synchronous detecting circuit. The input portion (11) of the synchronous detecting circuit is connected to receive a signal to be detected and the input portion (12) of the same is connected to receive a carrier wave. The base of the transistor (35) is connected to receive a switching signal. The synchronous detecting circuit performs a detecting operation when the switching signal assumes the low level; however, the transistor (35) is turned on when the switching signal assumes the high level so that the junctions (A) and (B) are short-circuited, whereby the synchronous detecting circuit does not perform a detecting operation. Accordingly, the detecting circuit can be switched with a simple circuit configuration.
    Type: Grant
    Filed: February 23, 1983
    Date of Patent: October 29, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenji Kojima
  • Patent number: 4550337
    Abstract: A video signal is serially enclosed for transmission in PCM form during synchronizing level intervals and encoded in a run length limited NRZ form during non-synchronizing level intervals, each PCM word being selected from minimum and maximum disallowed states of the NRZ code. In a decoder, a first detector responds only to the presence of the PCM code for synchronizing a second detector with response to both the NRZ and PCM coded portions of the encoded video signal to provide a decoded video output signal whereby the PCM portion of the signal conveys both decoder timing information and information as to a specific level of the video signal.
    Type: Grant
    Filed: April 7, 1983
    Date of Patent: October 29, 1985
    Assignee: RCA Corporation
    Inventors: Robert A. Dischert, Warren H. Moles, Roland N. Rhodes, James M. Walter
  • Patent number: 4547797
    Abstract: An apparatus for color and brightness correction for a multi-gun color CRT display, providing compensation for variation in phosphor efficiency with cathode energization and for color tracking between guns. The brightness correction circuit is required to respond only to essentially DC changes, while a color selection circuit responds at a video rate. In a preferred digital embodiment, brightness and color tracking correction factors are stored in memory dedicated to a particular CRT, and addressed in response to input from a reference brightness level selected by an operator. A color selection decoder having stored in a second memory relative brightness characteristics of each color phosphor as a function of the hue commanded converts an input binary command to an analog output, which is combined with the brightness and color tracking correction factor to determine the resulting cathode energization for each color gun.
    Type: Grant
    Filed: October 12, 1982
    Date of Patent: October 15, 1985
    Assignee: Sperry Corporation
    Inventor: Perry J. Mick
  • Patent number: 4546377
    Abstract: A circuit arrangement for processing color television signals incorporated in a multi-mode type color TV receiver which is capable of receiving TV signals processed by different television systems such as NTSC and PAL systems.
    Type: Grant
    Filed: June 3, 1983
    Date of Patent: October 8, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Yoshitaka Kasagi, Tokio Aketagawa
  • Patent number: 4546378
    Abstract: Movement detection in a PAL television signal is effected on that portion of the television signal which is located within the chrominance signal band. This portion (obtained via 3) is demodulated into color difference signals (11, 13) which are added (29) and subtracted (27). The subtracted signal is delayed for one picture period and combined (39) with the added signal. Then the absolute value is produced (45), so that a signal is obtained which only reports movement and does not interpret crosstalk from the luminance signal of a still picture to the chrominance signal as movement.
    Type: Grant
    Filed: July 18, 1983
    Date of Patent: October 8, 1985
    Assignee: U.S. Philips Corporation
    Inventor: Marcellinus J. J. C. Annegarn
  • Patent number: 4544947
    Abstract: Adjustment-free drive circuit for color television picture tubes, including an amplifier having a non-inverting input receiving an equalized signal of an individual color component red, green or blue as a reference value, an inverting input receiving a voltage proportional to the actual value of the cathode current, and an output, the reference value at the non-inverting input being compared in the amplifier with the actual value at the inverting input for issuing a signal at the output of the amplifier having the smallest possible difference between the desired and actual values, the output of the amplifier being connected to the control grid of a picture tube for applying the signal issued at the output thereto.
    Type: Grant
    Filed: February 10, 1983
    Date of Patent: October 1, 1985
    Assignee: Siemens Aktiengesellschaft
    Inventor: Wolfgang Haussman