摘要:
A speech based man-machine communication system is given, comprising more than one controllable device provided with speech synthesis function. Each of the devices in question is provided with its own unique voice pattern. The devices are connected via a bus, so that a central authority handles all the requests from the user. Because the user uses his natural language, commands can be ambiguous. Therefore an algorithm for handling ambiguous situations is provided.
摘要:
The present invention relates to a process and a device for the wireless transmission of a signal S.sub.1 between a transmitter and at least one receiver.According to the invention, at the sending end:a first carrier S.sub.2, of frequency F.sub.2, situated in the VHF (Very High Frequency) range, is frequency-modulated by the signal S.sub.1 to be transmitted, and thena second carrier S.sub.3 of frequency F.sub.3, situated in the SHF (Super High Frequency) frequency range, is amplitude-modulated by a modulating signal S.sub.2m. resulting from the frequency modulation of the carrier S.sub.2 so as to transmit an amplitude-modulated signal S.sub.3m to the receiver,and at the receiving end:amplitude demodulation of the signal S.sub.3m is performed so as to recover the signal S.sub.2m, and thenfrequency demodulation of the signal S.sub.2m is performed so as to recover the signal S.sub.1.
摘要:
A video receiving device (A) that includes a circuit for receiving first video signals from a remote transmitter, a circuit for receiving second video signals from another video receiver (TVS), a circuit (TU1) for automatic searching for transmission channels, and a circuit (PC) for phase comparison between the vertical synchronization signals of the first video signals and the vertical synchronization signals of the second video signals that can output an "outphasing" signal that is used for controlling the operation of the automatic channel search circuit, wherein the video receiving device (A) also includes a control circuit (CC) that enables the video signals that it is receiving to be displayed for a pre-determined time on the other video receiver (TVS). The invention is applicable notably to the programming of video recorders, and to the automatic tuning of such a recorder to the channel being viewed on a TV receiver in order to enable simple and immediate recording of this channel.
摘要:
The invention relates to a device for blockwise estimation of motion. This device includes on the one hand a matrix array (300) for calculating an error function, the said array including storage elements (S, 406, 407) for plural blocks (a, a') of current pixels and means (403) for switching between the storage elements corresponding to the various blocks and on the other hand a memory (801) for feeding the said array with pixels of a search window, linked to the said array.The device according to the invention is characterized in thatthe said memory (801) is a random access memory,the said memory contains a band of the search window corresponding to the entirety of the current blocks stored in the array (300),the said device including means (812) for read-addressing partial sections of the said band of the memory as a function of the block processed (a, a') by the said array, the said sections being introduced column by column into the said array.The invention also relates to a corresponding method and applies especially in the field of digital television.FIG. 7.
摘要:
When a given row in an array of a liquid crystal display having a toggling backplane voltage is de-selected, the row select line voltage also toggles to prevent capacitive current in the pixel capacitance. The row select line driver includes a pair of transistors coupled in a push-pull configuration. The pair of transistors are responsive to a control signal that is produced in a corresponding stage of cascaded stages of a shift register. The pair of transistors form a buffer stage that prevents the toggling voltage developed in the row select line when the row is de-selected from affecting the operation of the shift register.
摘要:
A process for differential coding of a motion vector associated with a macro-block, including the steps: of determining the components of the said motion vector, of determining a prediction vector, each component of which is equal to the median value of the corresponding components of at least three candidate motion vectors, a candidate motion vector being a vector associated with a previously coded macro-block, and of subtracting the components thus obtained from the components of the vector to be coded. Implementation of the process is included.
摘要:
A transmitted high definition television signal is represented by a packetized datastream configured as a sequence of data fields with a non-uniform data rate due to different types of different duration non-data overhead information. Each data field is prefaced by a Field Sync overhead segment followed by 312 packetized data segments each with associated overhead information. At a transmitter, a transport processor forms data packets with associated headers and exhibits uninterrupted operation at a constant uniform data rate, while supplying a packetized datastream to a network which constructs sequential data fields by inserting the non-data overhead information into the datastream. The transport processor is advantageously operated at a constant uniform data rate without having to modify the original data field structure to accommodate the needs of the data field construction network. This result is facilitated by transferring data from the transport processor to an associated interface/buffer network in response to a 3/8 symbol clock, in combination with a predetermined buffer fullness level. A counterpart transport processor/decoder at a receiver coacts with a data field processor and similarly exhibits uninterrupted operation at a constant uniform data rate.
摘要:
For motion compensated interpolation (MCI) with sub-pixel accuracy, the missing pixels need to be interpolated prior to the motion compensation. The required pixel values are stored using line and pixel delays. A switch matrix selects, in response to a motion vector, such stored pixels which are currently needed for the processing. In order to avoid sub-pixel MCI, the interpolation is carried out prior to the motion compensation. In order to avoid an increased input data rate of the motion compensation circuitry, only a standard switch matrix is used. A special arrangement of delays storing pixel values needed for the processing is used to extend the standard delay array. Because an increased number of pixels is involved, an improved sub-pixel MCI can be achieved. This is because such a delay extension does not significantly affect the decoded picture quality even if adjacent motion vectors do not exactly match the current motion vector.
摘要:
A procedure for quantification of coefficients in a variable data rate image compression system, in the form of blocks and macroblocks, the system including circuitry for transformation of blocks of pixels into blocks of coefficients, circuitry for quantification of these coefficients, circuitry for storage of coded information before transmission, and circuitry for regulation of quantification as a function of the state of the circuitry for storage. The procedure is such that each image is divided into groups of blocks, at least when a so-called current image must be coded in inter mode, a quantifier is determined at the start of the current image, the quantifier being corrected by a correction coefficient recalculated before the quantification of at least one of the groups, the coefficient being a function of the difference between, first, the number of bits produced for all the groups of blocks previously coded and, secondly, a prediction of this number of bits, the prediction being based on the distribution of the bits during the coding of at least one image preceding the current image. The invention is applicable notably in the field of image compression at low data transmission rates.
摘要:
The disclosure relates to a A digital filtering system of a signal, including a calculation circuit that calculates the average increase in amplitude .DELTA.X.sub.av (n) between two samples X(n), and an "output signal (Y(n)) circuit" that calculates a mean, weighted by a coefficient a, of the sample to be filtered X(n) and the previous sample Y(n-1) algebraically increased by said average increase in amplitude .DELTA.X.sub.av (n). The invention is applicable to digital signal processing.