Abstract: A phase-locked loop is provided which is operable to lock the sampling clock (pixel clock) to the incoming horizontal sync pulse contained within composite video information. Two modes of operation, coarse lock mode and fine lock mode, are used in controlling the phase-locked loop. In the coarse lock mode, coarse corrections are made to a horizontal discrete time oscillator so that a fast lock may be achieve using the fine lock mode. Coarse corrections are based on a normalized sum of weighted pixels collected within a narrow gate window. Lock is achieved when the falling edge is centered within the window.

Abstract: A video image projection apparatus is disclosed. The apparatus uses a laser as a light source and modulates the light beam using a modulator according to an image signal. The apparatus projects the modulated light to a screen using a light scanning system. The laser display system includes three primary color laser light sources, an optical system needed for three-color light combining/separation, a light modulator loading the image signal into the three-color laser, and a driving circuit driving the system by processing the video signal electronically. A hybrid video laser color mixer has a structure that combines very small-sized hybrid light beam combining/separation optical elements and a 3-channel light modulator. It allows the size of the image projection apparatus to be about 6 by 5 by 3 centimeters. Additionally, the light alignment of the elements is close to self-alignment.

Abstract: A scanning line number converting apparatus using a linear array type multi-parallel processor constructed by an input image data storing unit, a plurality of element processors which has a data memory section and an ALU array section and are provided in parallel and operate in accordance with the same command for a plurality of data, and an output image data storing unit, wherein one of the element processors is used as an FIFO and image data is transferred to the other element processors, and an interpolation arithmetic operation for a scanning line number conversion is executed by the element processor on the transfer destination side, so that the scanning line number conversion can be performed without using any image memory and memory controller.

Abstract: Systems and methods for correlating color correction instruction between two color correcting devices are disclosed. The method includes performing a nulling test on a representation a first device has of a known standard and retaining the results of the test. A second color correcting device performs a nulling test on the same known standard and the results of this test are retained. From the results of these two tests a color correction instruction of one of the devices may be converted to a color correction instruction on the other device so that substantially the same color correction effect is achieved.

Abstract: A frame conversion device for switching between a plurality of image signals that are not synchronous and outputting each image signal continuously and synchronously. In addition, a desired signal is extracted from the continuous image signals and then output in parallel with the continuous image signals. The frame conversion device utilizes a frame conversion unit for recording an image signal optionally selected from a plurality of input image signals. A frame unit is utilized for reproducing a recorded signal outputted from the frame conversion unit independent of the operation of the frame conversion unit. The frame conversion unit includes an identification signal assigning part which assigns an identification signal to a non-image region of an image signal selected from a plurality of input signals. Frame-converting storage parts store the selected image signal. A signal output part selectively reads the image signal stored in each frame-converting storage device.

Abstract: A television receiver (10) that has a spatial light modulator (15) and a projection lens (17a) and that projects images to a screen (18). If the aspect ratio of the image to be displayed does not match that of the spatial light modulator (15), an anamorphic lens (17b) is positioned in the optical path of the image, between the projection lens (17b) and the screen (18). In this case and in typical applications, the spatial light modulator (15) generates an image that is anamorphically squeezed in the horizontal dimension, and the anamorphic lens (17b) widens the image so that the viewer perceives a normal wide-screen image on the screen (18).

Abstract: A receiver circuit, which may be used in a leakage detector, includes an RF input, a narrow band filter, and a direct demodulator. The leakage detector in which the receiver circuit may be used is operable to measure leakage in a communication system, the communication system operable to transmit broadband communication signals comprising one or more radio frequency carrier signals modulated by one or more baseband communication signals, wherein each radio frequency carrier signal has a channel frequency. Essentially, the exemplary receiver circuit according to the present invention is operable to generate a baseband leakage signal. To this end, the RF input is coupled to a source of broadband communication signals and receives a broadband communication signal therefrom, the broadband comnunication signal including a first signal associated with a first channel frequency.

Abstract: During the reception of VSB DTV signal, the channel equalizer for a QAM/VSB DTV signal receiver the equalizer is operated to equalize only the real sample stream of VSB symbol code, rather than being operated as a complex equalizer. During the reception of QAM DTV signal, the real sample stream of QAM symbol code and the imaginary sample stream of QAM symbol code are time-division-multiplexed together on an alternate sample basis to generate input signal for the channel equalizer, which is operated as a dual-phase filter. After equalization, the time-division-multiplexed real and imaginary samples of QAM symbol code are de-multiplexed to recover parallel real and imaginary sample streams of QAM symbol code that are independent of each other, but have been subjected to similar equalization. Supposing that the QAM DTV symbol code rate is half the VSB DTV symbol code rate, the minimum sampling rate for operation of the channel equalizer is the same for both types of symbol code.

Abstract: A gamma correction circuit includes an amplifier (A) coupled to receive an input signal (Vi), and a non-linear impedance (Rg) coupled to the amplifier (A) for determining a gain of the gamma correction circuit in such a manner that the gain increases when the input signal (Vi) increases.

Abstract: A combined image is made up of a static image and a motion image. An area of the static image is replaced by the motion image to form the combined image. The combined image is then coded and transmitted from one communication partner to another communication partner by way of a network.

Abstract: The invention relates to an electronic apparatus whose power is supplied by a battery (11) having a memory (32) which contains electrically erasable data (32a) and a supply voltage detection device (37) for detecting a variation of the supply voltage (Vbat). The invention notably has for its object to provide a detection device (37) which is capable of instantaneously detecting various voltage levels to cut off the power supply (Vbat) without the contents of the memory (32) being changed and capable of indicating the charging level of a battery (11) or an overload. The invention may be used in portable telephones and other electronic equipment whose power is supplied by a power supply battery.

Abstract: A hardware-implemented screen-saver prevents burn-in of an image displayed on a screen of a display product by automatically reducing the video gain, and therefore the contrast, of the image when the portion of the image within a two-dimensional detection window has changed by less than a predetermined amount for a predetermined period of time. A lack of change of the incoming video signal of the image is detected and used to invoke a reduction in contrast of the image displayed on the display product. This allows the image to remain visible, yet reduces the possibility of burn-in of the image in the screen of the display product.

Abstract: A signal processing method for an analogue picture signal is proposed. In this case, the analogue picture signal originates from a computing unit (10) in which the signal was generated digitally in accordance with a graphics standard such as, for example, EGA or VGA and was subsequently converted into analogue form. The method consists in subjecting the analogue picture signal to analogue/digital conversion at a first chosen sampling frequency, after which the sampled picture is then investigated for picture disturbances, in order to determine a corrected sampling frequency. Further measures relate to the determination of the optimum sampling phase and the determination of the exact position of the active picture relative to the horizontal and/or vertical synchronization pulses.

Abstract: Disclosed are method and apparatus which measure signal level of an RF signal. The measured RF signal includes a baseband signal modulated onto a first carrier signal having a first frequency and the baseband signal includes program information and control information. The method and apparatus digitize the RF signal which includes the baseband control information and determine a signal level measurement from the baseband control information in the digitized RF signal. Furthermore, method and apparatus are disclosed which determine from the digitized RF signal whether a tagging signal is present in the RF signal.

Abstract: A video signal mixing apparatus and a method thereof, which is capable of minimizing timing jitter caused when onsynchronized video signals are digitally mixed. A signal subtractor subtracts a second video signal synchronized with a clock signal from a first video signal which is not synchronized with the clock signal, and a weighted value extractor divides one period of the clock signal into N intervals, detects the interval where a digital selection signal is generated, among the N divided intervals, and outputs a predetermined value (where 0≦predetermined value≦1) allocated to the detected interval as a weighted value. A multiplier multiplies the weighted value with the output of the signal subtractor and outputs the multiplication result, and a signal mixer mixes the multiplication result with the second video signal and outputs the mixed result as a mixed video signal. Therefore, error causing timing jitter is reduced to 1/N, thereby minimizing dot crawling of the mixed image.

Abstract: A method of broadcasting controlling data streams and remote receiving apparatus for using the same are disclosed. A viewer-channel-to-broadcast channel (VCBC) map is employed to map one or more controlling data streams to one or more channels. The VCBC map is stored in memory. When a user tunes to a channel, the VCBC map is checked to determine if a controlling data stream is associated with the tuned channel. The VCBC map is periodically updated and broadcasted.

Abstract: Plural-conversion radio receivers for receiving DTV signals, in accordance with the Advanced Television Systems Committee (ATSC) standard, or analog TV, in accordance with the National Television Sub-Committee (NTSC) standard, utilize a first intermediate-frequency band spanning 917-923 MHz and a second intermediate-frequency band spanning 35.5-41.5 MHz. A local oscillator generates local oscillations at 958.5 MHz for mixing with signal in the first intermediate-frequency band to generate signal in the second intermediate-frequency band. These local oscillations do not interfere with the aeronautical navigation band or with channel 81 television broadcasting. The second harmonic of sound carrier in the second intermediate-frequency band falls below the 88-108 MHz FM broadcast band.

Abstract: A tuner, for example, for a television receiver, includes a UHF and a VHF section and a mixer oscillator stage. It is known that the VHF frequency band has to be split in at least two parts to handle the VHF signals. To that end, the mixer oscillator stage uses two separate VHF oscillators and a detector to switch tuned parts of the VHF section. In this way, the performance of the tuner is improved.

Abstract: Apparatus for displaying a combined image of an auxiliary image and a main image includes a source of a main image signal and a source of samples representing an auxiliary image signal. A quincunx subsampler is coupled to the auxiliary image sample source and the quincunx subsampler. The sample combiner combines the main image signal and a signal representing the quincunx subsampled samples to generate a signal representing a combined image of the main and auxiliary images.

Abstract: A method of transmitting a leakage tagging signal includes inserting a tagging signal into a CATV television signal only during portions of the television signal in which control information is present. A method according to the present invention is a method of transmitting a tagging signal in a communication system, the communication system transmitting television signals comprising control information and program information. One step of the method includes generating a tagging signal that is detectable by corresponding leakage detecting equipment. The method also includes the step of identifying a portion of a television signal in which control information is present. Finally, the method of the present invention encompasses inserting the tagging signal into the television signal only during the portion of the television signal in which control information is present.