Abstract: The invention concerns a device for transmitting packets in a packet communication network comprising at least two stations, characterized in that it includes means for: extract image cues from a synchronizing signal, initializing a first counter based on said image cues, initializing a second counter every “m” zero crossing of the first counter, sampling the second counter at all the Tech periods, where Tech is derived from a time base synchronized on all the network stations, and transmitting packets containing the samples in the network. The invention also concerns a device for receiving packets in a packet communication network comprising at least two stations.

Abstract: A method of automatic luminance-chrominance delay compensation is disclosed. The method generally includes the steps of (A) generating an intermediate signal by processing a video signal such as to enhance a plurality of edges in a picture within the video signal, the picture having a luminance component and a chrominance component temporally separated from each other by an actual delay, (B) identifying an estimated delay between the luminance component and the chrominance component by correlating the luminance component in the intermediate signal to the chrominance component in the intermediate signal at a plurality of relative delays and (C) compensating for the actual delay by delaying one of either (i) the luminance component and (ii) the chrominance component by the estimated delay.

Abstract: A transmission system for transmitting analog color video signals wherein a cable comprising multiple twisted pairs is employed, and certain of these pairs are coupled to carry selected color signals as a function of the delay provided by particular twist rates. In certain instances, selected signal delay devices are connected in circuit with certain twisted pairs. By such an arrangement, it has been found that relatively long distances between a computer and a monitor may be spanned by relatively low-cost, twisted pair cable commonly used for telephone communications.

Abstract: A color temperature conversion method, medium, and apparatus converting an image from one of a plurality of basic color temperatures provided by an image display device to another color temperature other than the plurality of basic color temperatures. Also, the conversion method and apparatus enable pixels of the image with different brightnesses to have different color temperatures according to a user' preference. The color temperature conversion method includes: calculating variables for determining a conversion range; determining whether based on the calculated variables the input pixel is to be color-temperature-converted by determining whether the input pixel is within the conversion range; and converting the color temperature of the input pixel by moving in the same direction as the reference point to the target point in amount proportional to the reference point displacement so that the input pixel can be automatically moved along with the reference point of the conversion range.

Abstract: After a command signal corresponding to a gradation whose light emission is controlled is outputted from a controller IC 4, based on this, a combination of respectively different intensity conversion data are extracted from a linear data table 11 and a ? correction data table 12. The respective intensity conversion data are analog converted by a first DAC 13 and a second DAC 14, and these are converted into a voltage level of a mean value by resistors R1, R2 and an addition circuit 15. By this voltage level of the mean value, an absorption current in a current mirror circuit 16 is controlled, and as a result, a drive current accompanied by ? correction for the light emitting elements can be obtained by the current mirror circuit 16. The first DAC 13 and the second DAC 14 handle relatively simple intensity conversion data obtained from the linear data table 11 and the ? correction data table 12 and analog convert such data.

Abstract: In a method and apparatus for connecting fiber optic lines and a fiber optic receiver and a fiber optic transmitter in an information transmission system carrying information signals propagated from a transmitter to a receiver in one direction and an external synchronizing signal from the receiver to the transmitter in the opposite direction, a fiber optic receiver includes a circuit for receiving an optical information signal from the transmitter and converting that signal into an electrical signal which is processed into an information signal outputted to the transmission line via a common connector. A pulse signal transmitted to the fiber optic receiver is retrieved and separated from the information signal. The pulse signal is an external synchronizing signal having a voltage level higher than the maximum level or lower than the minimum voltage level of the video signal. The pulse signal is injected into the information transmission line or the fiber optic line.

Abstract: A luminance component of a video signal is modulated in a first frequency band. A chrominance component of the video signal is modulated in a second frequency band. The modulated luminance component and the modulated chrominance component are then transmitted across a communication link.

Abstract: An in-service, realtime picture quality analysis method determines the degradation of a test video signal at a test point with respect to a reference video signal by generating from the reference video signal a set of parameters that characterize the images represented by the reference video signal. The set of parameters are inserted into a transport stream that also has an encoded version of the reference video signal. At the test point the set of parameters is extracted from the transport stream, and the test video signal is decoded from the transport stream. A corresponding set of parameters is generated for the test video signal, and the two sets of parameters are compared by a picture quality analysis algorithm to produce a picture quality rating that represents the degradation of the test video signal.

Abstract: A signal processing circuit for adding a synchronizing signal to a predetermined signal, wherein the synchronizing signal oscillates to one side from a reference level of the synchronizing signal, and wherein the predetermined signal oscillates to one side from a reference level of the synchronizing signal, and wherein the predetermined signal oscillates to one or both sides from a reference level of the predetermined signal.

Abstract: In a television signal transmission system including a transmitter and a receiver, a reference signal has a phase angle between 0.degree. and 360.degree. within a single cycle. The phase angle of the reference signal is successively produced by a phase angle generator and transmitted from the transmitter and is reproduced by the receiver to be compared with a received phase angle. The phase angle is modified by a compensation phase angle obtained from a phase difference in the transmitter and the receiver. The reference signal may be either a color subcarrier signal or a sequence of sampling clocks.

Abstract: An external color frame is synchronized with a local color frame without producing a pixel position error. A frame synchronizer synchronizes a frame from an external television signal with that of a local television signal. A wide screen oriented high definition television signal is used as the external television signal, the image quality of which is improved by adding a support signal to the main screen signal. A memory is provided to receive and store the external television signal and the external signal is read from the memory after a predetermined time passes when the frame difference between the external and local television signals is at least one frame. In this instance, only the support signal in the readout of the external television signal is corrected by a low pass filter in order to match the pixel position of the support signal to that of the main screen signal.