WO1993013611A1 - Systeme de transmission televisuelle sans balayage - Google Patents

Systeme de transmission televisuelle sans balayage Download PDF

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Publication number
WO1993013611A1
WO1993013611A1 PCT/US1992/010962 US9210962W WO9313611A1 WO 1993013611 A1 WO1993013611 A1 WO 1993013611A1 US 9210962 W US9210962 W US 9210962W WO 9313611 A1 WO9313611 A1 WO 9313611A1
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WO
WIPO (PCT)
Prior art keywords
transmission
bits
information
codes
bit
Prior art date
Application number
PCT/US1992/010962
Other languages
English (en)
Inventor
Elliot L. Gruenberg
Original Assignee
Compfax Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compfax Corporation filed Critical Compfax Corporation
Priority to EP93901165A priority Critical patent/EP0619057A1/fr
Priority to JP5511764A priority patent/JPH07502633A/ja
Priority to BR9206980A priority patent/BR9206980A/pt
Publication of WO1993013611A1 publication Critical patent/WO1993013611A1/fr
Priority to FI943010A priority patent/FI943010A/fi

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability

Definitions

  • the present invention relates to apparatus and method for transmitting and storing graphic and other information in public and private facilities, which method requires significantly less use of bandwidth and memory of those facilities.
  • Patent No. 5,029,210 issued in July of 1991, a cooperative communication system was described.
  • This patent invention shows principles of operation of a communication system which have in part been used in the present invention.
  • _for the pixels are reproduced and located in corresponding pixel positions on the screen of a device such as a cathode ray tube.
  • HDTV high definition TV
  • the present transmission system eliminates the scanning and provides for a method of parallel transmission of information from the transmitted scene to the received screen bandwidth of the present system, that only requires in the order of 60 hertz.
  • the information is divided into elementary areas (pixels) and these areas are scanned by a beam at a rate determined by motion of objects in the scene, or by time of storage in the eye (flicker) and by the number of elements to be scanned.
  • the receiver is synchronized to the scan rate so that the receiver places the pixel in the right location on the screen.
  • Prior methods of transmitting wide band data, such as TV, other than by the time division method just described, include assigning a separate frequency channel for each input (pixel) , or assigning a separate code per pixel.
  • the receiver must employ a corresponding frequency channel for each pixel, the width of which must be wide enough to accommodate the possible time rate of change of the pixel information.
  • Sufficient bandwidth must be provided for the transmission of any, or all, of the pixel information, or n(l/t) where t is the shortest time change of pixel information to be expected. Therefore, this method requires the same bandwidth as the sequentially transmitted scanned method presently in use.
  • the receiver codes ideally should be codes which provide correlation coefficient of one when correlated with the same transmit code and zero or a very low value when correlated with any other code after being convolved and integrated over the time period t. This method is described in "Handbook of Telemetry and Remote Control", pages 9-39 thru 9-52, (Gruenberg, McGraw Hill, 1967). Since n codes are required for n pixels, the bits must require a bandwidth of 1/nt. Thus, this method requires the same bandwidth as the sequential time division method.
  • the transmission channel rate is r, rather than rn where r is the required rate of changing the scene sample.
  • r 30 scenes per second
  • the transmission channel rate is 30 pulses per sec. (one pulse per scene) , an improvement of 1.000.000.
  • Each pixel which uses a common transmission channel with the other pixels is connected to a communication system shown in Fig. 1, which includes new sending and receiving apparatus.
  • This apparatus contains the orthogonal coding for each pixel and special modulating devices called Switched Inverters. The transmission of energy is dependent on the status of the inverters at each terminal.
  • This apparatus allows each receiving pixel to respond only to a transmitting pixel with a corresponding code. If these n codes of length n were to be transmitted simultaneously, as by present means, a common channel bandwidth of n x (1/t) is required, where t is the time required by the change of information in the scene, resulting in no bandwidth savings. However, most significantly, the present invention provides a method which reduces the bandwidth requirement to 1/t.
  • each transmitter bit location (pixel) is linked to a corresponding bit location in the transmitter via a common pair of transmission paths allowing energy to pass from the transmitting point to the receiving location and from the receiving point back to the transmitting location.
  • This energy is amplified and recirculated as taught in Patent No. 5,029,210, "Cooperative Communication System” so that energy will build up to detectable levels when the phase inverting switches adjust the phase inversion in the loop arrangements appropriately.
  • the inversions are complementary, i.e., the transmitter switch is inverting and the receiving switch is non-inverting, the conditions are set for energy build up.
  • the amplitude of energy in the common channel transmission link flowing from transmitter to receiver and receiver to transmitter may increase with the number of simultaneously energized pixels (or bit locations registering "1" bits) , but the bandwidth will remain fixed and controlled by the narrow band filter.
  • a limiter may be used to limit the rise in amplitude in the links.
  • a receive bit location will not register a bit "1" if the corresponding transmit bit location is not actively transmitting a bit.
  • Other transmit bits will cause energy oltage to be present on the common transmit link.
  • voltage is limited at each bit location.
  • the receiver switched inverter of such a bit location will chop up this voltage, rendering it unsuitable to pass through the low pass or narrow pass filter of that bit location which passes energy to the receive to transmit link and which feeds signal to the bit detector. Thus interference among the bit locations is eliminated.
  • the present invention can transmit a simultaneously available ensemble of information over a narrow band channel, the bandwidth of which is determined only by the rate of time change of the entire ensemble of transmitted bits.
  • this rate of change is determined primarily by the persistence of vision. It may also be determined by motion within the scene. Sending changes in individual bit locations will reduce the number of simultaneously transmitted bits in the ensemble. This effect may be used to further reduce the transmit rate and bandwidth.
  • bandwidth requirement also reduces the transmit power requirement in proportion to bandwidth where the signals compete with noise. This power reduction is significant. In the case of TV the power can be reduced by a factor of as much as 1,000,000 or transmit power of 100 milliwatt would provide the same useful signal as a present transmitter of 100 KW, for example.
  • the usefulness of this system is not limited to TV but may be applied to any digital transmission system such as digital telephone.
  • Digital phones using PCM require 64,000 bits per second to transmit a voice conversation. Applying this invention to this situation would, for example, allow such a phone conversation to be transmitted in a lKhz bandwidth over voice frequency lines.
  • Such a system could use 64 codes repetitiously used each millisecond. Refinements discussed below could reduce the number of codes to 16.
  • the instant invention therefore provides the following useful features.
  • Transmission of digital voice may be reduced to bandwidth requirements that can be accommodated by existing analog transmission facilities or narrower band. Much higher transmission rates for digital data can then be provided by narrow band telephone and radio facilities.
  • TV reception apparatus may easily be instrumented as a flat plate, using this technology in conjunction with existing flat plate display technology, which employ methods to drive each pixel individually.
  • Radio Frequency transmission power requirement may be accordingly reduced up to 1,000,000 fold or more.
  • a third set of codes may be used to specify pixel locations in three dimensions. These codes can provide isometric representation.
  • Random Access memories may be remotely addressed over narrow band links. Access Time may be greatly reduced by simultaneous transmission.
  • Changing pixels may be handled separately from non-changing ones further reducing bandwidth requirements.
  • a large number of computers may work in parallel at high speeds although connected by narrowband links. Interspersed commands are possible. Space vehicles may send much larger bit rates longer distances by sending large amounts of data in parallel. Power to communicate will be vastly lower reducing communication equipment requirements (such as antennas) .
  • FIG. 1 is an overview of a Scanless TV System.
  • FIG. 2 is the Transmission System.
  • FIG. 3 shows examples of codes used in the system.
  • FIG. 4 is a diagram to facilitate understanding of the operation of the Transmission System.
  • FIGS. 5 A and B are more detailed views of the transmission encoder and decoder units, and C2 is one embodiment of the common storage unit for codes.
  • FIG. 6 is a diagram of the system used for reduced bandwidth digital transmission.
  • FIG. 7 shows method of encoding gray scale and other attributes.
  • FIG. 8 shows the multidimensional binary encoding system.
  • FIG. 9 shows details of Types of Switched Inverters.
  • FIG. 10 shows a single channel transmission system.
  • item 1 is the new sending apparatus for transmission of scene material item 3.
  • Item 2 is the new receiving apparatus for converting the transmitted information to usable information for the receiving screen.
  • Scene 3 may be made up of individual pixels lined up in rows and columns. These pixels are light sensitive and may be sensitive to specific colors.
  • Each pixel such as 5 is connected to the sending apparatus via lines 10 through IN and 20 through 2N.
  • each pixel can be connected to the send apparatus 1 via two connections; thus pixel 5 may be connected by lines 10
  • connections 10 through 2N are individually connected to bit generators in the send apparatus, such as 100 and 107 in FIG. 2.
  • the send apparatus is connected to the receive apparatus via transmission link 112.
  • a return link 113 is also used. As will be seen, these links require very small bandwidths in the order of 60 hertz.
  • the receive apparatus is connected via its bit receivers such as 119 and 123 in FIG. 2 to the screen.
  • the screen consists of individual points of illumination. The value of illumination of individual pixels is determined by the bit receivers.
  • each pixel may be individually connected via lines 30 through 4N but it is a: advantageous to use two connections per pixel, one row connection and one column connection.
  • the row connections being 30 through 3N and column connections are 40 through 4N.
  • the illumination of pixel 7 is determined by said lines 30 and 40 corresponding to the transmission lines 10 and 20.
  • the illumination of 7 is governed by the use of an AND circuit which logically adds the outputs of 30 and 40.
  • FIG. 2 which details the transmission system.
  • Each pixel of the sending unit is connected to a bit generator such as number 100 shown in FIG. 2, the system is specifically useful for transmitting digital information or information in binary form.
  • gray scale When the pixels are not in digital form, it would be necessary to convert those pixel values into binary form.
  • One approach to this would be to send the gray scale information in the form of bit planes.
  • Bit planes are scenes containing bits of a common value or level of significance.
  • gray scale could require 4 bits which can be transmitted separately and successively, one bit plane at a time. This will cause a bandwidth increase by a factor of 4 or an increase from 30 to 120 hertz, for example.
  • Bit Generator 100 transmits bits when they are present at the pixel location to XOR operator 102; a locally generated code is also provided to 102 by coder 101.
  • the codes generated by 101 and 108 are orthogonal codes of length n where n is governed by the number of pixels. As mentioned before, one method would be to provide a bit generator or each pixel in the raster which would, for a 1000 x 1000 raster, require a code length of 1,000,000.
  • One method of generating these codes is by a continuously revolving multiple head magnetic drum or disc of the right speed which would contain all of the necessary codes such as 102 and 109. These codes will remain fixed for the full operation of the system.
  • the output of 102 is used to control a switched inverter 103.
  • the operation of 103 is to provide an inversion of phase (a shift of 180 degrees) when it is switched from one position to the other. Inverter 103 has only these two operating positions. This inversion is provided by switching in or out one stage of amplification as described in U.S. Patent No. 5,029,210.
  • Switched inverter 103 operates in a loop consisting of 103, amplifier 105 the transmission link 112, the filter 114, which comprises one transmission link, the switch inverter 117, lowpass filter 118, amplifier 115, other transmission link 113 and filter 106.
  • Switched inverter 103 and switched inverter 117 of the receiver act cooperatively in this loop.
  • the inverters 103 and 117 operating with the amplification provided by 104, 105 and 115 cause an oscillation to occur when one or the other switch inverter is providing an inversion. If both 103 and 117 are providing the inversion or 180 degree phase shift at all frequencies there will not be an oscillation in this loop. If both of the inverters are not inverting, providing zero degree phase shift, there will also not be an oscillation.
  • the oscillatory state of the loop is detected by the bit receiver 119 which rectifies the oscillation and converts it into a "1" bit. This "1" bit activates a pixel in the received screen.
  • Decoder 116 operates the switched inverter in similar fashion to 101. Only when the decoding code is complementary to the transmitted code will a low frequency sustained oscillation occur for the period of 1/3Oth of a second. Should other codes be generated, such as by 108, for example, which do not provide a complementary code sustained over this period, the filters 114 and 118 would prevent any such transmission.
  • Amplifiers 104, 105 and 115 and possibly the amplifiers in 103 and 117 provide sufficient amplification to overcome the losses around the loop.
  • bit generator 100 will provide for 1/3Oth of second a 1 bit level.
  • the coder 101 is constantly sending an orthogonal type code consisting of a total of "1" or "0" levels, the minimum width of which is 1/nth of 1/3Oth of a second.
  • decoder 116 Since decoder 116 has the same code as 101, and the XOR unit 102 converts the 101 code to the complement of 116, a sustained oscillation will occur around this loop. This sustained oscillation will be detected by 119, the bit receiver, which will illuminate the corresponding pixel in the receiver screen.
  • bit generator 107 When it is suitably illuminated or activated.
  • coder 108 has a code different than that of 101 and corresponds to the code contained in decoder 120.
  • the activated bit generator mixes with the decoder in XOR unit 109 which controls switched inverter 110 which is part of the loop containing amplifier 111 and both these units are part of a loop containing 105, 112, 114, 121, 122, 115, 113 and 106. Note that 105 amplifier, 112 transmission link, 114 filter, 115 amplifier, 113 transmission link and 106 filter are common to both of these loops.
  • FIG. 4 can be used to follow the operation of the transmission system shown in FIG. 2.
  • column 1 indicates the value of the bit being transmitted either "1" or "0”
  • column 2 indicates the arbitrarily chosen number of the pixel position
  • column 3 shows the transmit code
  • column 4 shows the transmitted bit waveform
  • column 5 shows the resulting state of the transmission switched inverter as to whether it is in an inverting ("1") or a non-inverting (or "0") state.
  • This state is the XOR product of column 2 and 3.
  • When in the inverting state a block is shown; when it is in a non-inverting state no block is shown.
  • Column 6 shows the state of the receiver switched inverter and column 7 shows the reception of a bit wave form (a "1") or a non-reception ("0"). Non-reception is shown by a line indicating zero energy; finally, in column 8 is shown the state of the transmission lines which are items 112 and 113 in FIG. 2.
  • the first line represents the transmission from pixel 1.
  • pixel 1 has a transmission code of all zeroes as shown in column 3.
  • the XOR operation on the transmit code is shown in column 3 and results in the transmission switched inverter (item 103) in FIG. 2 to be in the invert state.
  • the corresponding receive pixel position in FIG. 2 has a corresponding code in decoder 116 so that the switched inverter 117 is non-inverting as shown by the zero amplitude in column 6 and the bit receiver 119 will receive an amplitude designating receipt of a "1" Bit, as shown in column 7. There will be an amplitude on the transmission channel as shown at column 8.
  • Pixel 2 has a different code orthogonal to that used in Pixel 1.
  • a "1" bit is being transmitted which is XOR processed with the code of column 3 to produce the transmitted pattern of inversions presented in column 5.
  • This pattern is complementary to the inversion pattern of the receiver pattern of column 6 resulting in a "1" bit being present at pixel 2 as shown in column in column 7.
  • Rows 2 and 3 shows the operation when "0" bits are sent from pixels 1 and 2.
  • the transmit codes shown in column 3 are the same as before and the inversion patterns are complementary.
  • the transmit bits result in "0" bits being received as shown in column 7 and there is no amplitude on the transmission line (column 8) .
  • Rows 5 and 6 shows the case when the pixels send different bits.
  • the inversion patterns (columns 5 & 6) remain complementary for each pixel position.
  • Each receive pixel receives its corresponding pixel value, but the amplitude of the transmission line can only rise to the value caused by one active pixel.
  • the received bit level of pixel is zero corresponding to the transmitted level despite of the presence of amplitude on the transmission line. This is a result of the action of the receive switched inverter. This receive bit level will be zero at the end of the bit interval.
  • Rows 7 and 8 shows the operation for a Pixel 3 which has a different code that pixels 1 and 2 and is orthogonal to both of them.
  • This code causes different inversion patterns than the others but provides complementary transmit and receive inversions (columns 5 and 6) and correctly conveys the bit level to the receiver.
  • the coders 101 and 108 and other coders used for the rest of the transmit pixels require fixed codes which are repeated for each bit interval.
  • These codes are stored in a common storage unit 200 as shown in Fig. 5a.
  • This unit is a multi track memory with multiple readouts 201 a - - n.
  • the storage medium may be an endless magnetic tape, a magnetic drum, a bubble magnetic memory, or a preprogrammed read only memory (PROM) .
  • the speed and phasing of the codes stored in this memory must be coordinated with the decoder (such as 116, 120) which are stored in similar units 300 as the coders.
  • the synchronization is effected by the use of one of the tracks, 202, dedicated to synchronization.
  • the Transmit Coder Unit sends the synchronization code in the same manner as a pixel code. All these codes are constantly repeated.
  • the decoder unit contains a controller unit 303 which reads the output of the sync-channel detector and adjusts the memory unit 300 in time reference and time rate (if required) until a constant amplitude input to the control unit is achieved. Then the receiver coder apparatus is time phase locked to the transmitter.
  • the transmitter is governed in time and phase by Timing Unit 203, which in an electronic embodiment is a clock supplying regular clock read pulses. In the case of the endless tape or belt embodiment shown in figure 50, the timing is controlled by the speed of the tape or belt drive motor.
  • the same transmission system used for implementing the scanless TV system can be used for reducing the bandwidth requirement of a digital transmission system for a given information rate.
  • the TV system is replaced by the transmission buffers 51 and 52.
  • 51 receives serial digital transmission information from transmission line 50 and 51 delivers information to serial transmission line 53.
  • the buffer 51 feeds parallel information into Transmitting apparatus 1.
  • the parallel information bits are the same as pixels in our previous description which are fed into the bit generators which provide input to the XOR units which encodes the Switched Inverters.
  • the n parallel bits are transmitted via the common channels 112 and 13 to the receiving apparatus 2, which conveys the reception to parallel bit positions of the buffer 52 - every t seconds.
  • the buffer is serially read out by a local clock.
  • the buffers contains an intermediate storage so that new data can be received while the data received at the end of the previous T second interval is being clocked out.
  • the code word can be extended to include specification of gray scale, color and other attributes of a given pixel location. This is done by assigning additional identification codes to a pixel input, so that a pixel may have access to three, four or more such codes.
  • Gray tone or scale may be represented three or four or more bits to represent 8, 16 or more levels. Tint and hue may also be denoted by additional bits. (The procedure is similar for those attributes.)
  • Each of the gray scale bits controls a separate ID code as shown in Figure 7.
  • For pixel 1 gray scale bits 430, 431, 432 control the sending of I codes I , I lb , and I lc , which are respectively 433a,b, and c, respectively.
  • pixel 2 bits 434, 435, and 436 control 1 ⁇ , 1 ⁇ , and 1. ⁇ , 437a, b, and c, respectively.
  • the code sequence 455 is decoded as usual. However, the additional bits per pixel are decoded separately; i.e., a separate output at pixel 1 is obtained for I , I lb , and I, c at 438, 439, and 440, and for pixel 2 separate outputs are obtained for 1 ⁇ , 1 ⁇ ,, and I 2c at 441, 442, an 443.
  • the three outputs for pixel 1 are presented to digital to analog converter (D/A converter) 444 which derives the gray scale output for pixel 1.
  • D/A converter 445 uses the separate outputs 441, 442, and 443 to provide the gray scale output for pixel 2.
  • n log 2 n
  • transmission codes may be used by several pixels according to the demands of the binary representation of each pixel.
  • the pixels first activate the identification coders 450, 451, ... 453, for each active input.
  • Individual I bits activate several output bits in the connection matrix.
  • the output of this matrix designates code 455 which is comprised of C xl &I,C y j&I,C x2 &I C y &I...C xb &I,C yb &I.
  • This composite code represents one or many or all of the input pixels.
  • a given transmit code bit may be activated by several pixels.
  • the total number of transmit codes of 2b 2 provides sufficient codes for transmitting all the pixels whether or not all or a few pixels are transmitted simultaneously, because each receiver pixel location is uniquely masked to be responsive to only those multiple groups of codes (bits) which apply to the specific pixel location.
  • the common channel transmission may be translated to any suitable frequency by mixing with an oscillation on transmission and down converting the signal at the receiving end. Both 112 and 113 may be handled in the same fashion.
  • the mixed oscillations may be used for selective addressing. Both wired or wireless facilities may be used.
  • the system may also operate directly with a retrodirective oscillation loop so as to provide automatic directivity as taught in U.S. Patent No. 5,757,335, as well as increased transmission capacity.
  • the switched inverter may be implemented using a digitally controlled analog switch 500 shown in FIG. 9.
  • the chip type 4016 or 4066 may be used. They switch radio frequency signals at input 498.
  • the control signal 497 is digital and switches channel outputs pin 2 and pin 4 inversely; that is, pin 2 passes signal when pin 4 does not and vice versa.
  • the output of pin 2 passes through a linear amplifier 501 of odd number of stages and therefore the signal experiences a 180 degree phase shift or phase inversion with respect to signals passing through pin 4. Either signal is sent to output 503.
  • the output of pin 2 passes through a transformer 505 irt which the polarity of the signals in the secondary winding is reversed with respect to ground.
  • the output of pin 4 is fed to a transformer 504, the polarity of the secondary of which is not inverted with respect to ground. The result of this is that the output of the transformers 503 will be shifted 180 degrees out of phase in accordance with the state of the input 497.
  • a single channel may be used for transmission instead of a separate forward and return channel by making use of an additional 90 degree phase shifter in each terminal as shown in Figure 10.
  • the phase shifter is installed in the return line to cause the phase around the local loop to be always 90 degrees regardless of the setting of the inverting switch.
  • the phase around the loop formed by the path around both terminals contains both 90 degree shifts as well as the phase inversions of both terminals. This merely inverts the sense of the inverting switches which can be compensated for by changing the sense of the codes applied to the inverting switches.
  • Figure 10 shows only one transmission link 112 is used. Filter 106 is connected to 112 instead of transmission link 113 which is not used.
  • the new phase shifter 401 is connected to 106 and to amplifier 104 and to other branches (via z) .
  • the local terminal path is completed via switch inverter 103 which connects to the transmission link 112 via amplifier 115. (Other branches connect to 112 through 105 via w) . This local path will not oscillate because the loop phase is always a multiple of 90 degrees.
  • the other terminal path includes filter 114, switch inverter 117, the new phase shifter 402 and amplifier 115.
  • Other branches connect through x and y, Again the local loop phase is 90 degrees or a multiple thereof.
  • the mutual loop containing the two terminals can oscillate because the switch inverters can cause the loop phase to be multiples of 180 degrees.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Color Television Systems (AREA)
  • Studio Devices (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

Un système de transmission télévisuelle sans balayage est utilisé pour stocker des informations graphiques avec significativement moins de mémoire et de largeur de bande qu'il n'est actuellement requis. Un ensemble d'informations disponsibles simultanément peut être transmis sur un canal à bande étroite qui n'est limitée que par la vitesse de variation temporelle de l'ensemble total de bits transmis, en d'autres termes, pour la télévision ou la vidéo à images animées, la limite est la persistance des impressions visuelles. La réduction de la largeur de bande permet de réduire la puissance requise pour la transmission. Afin d'atteindre ces objectifs on utilise un opérateur et un générateur de bits, un inverseur commuté (utilisant un amplificateur, une boucle de transmission et un filtre), un inverseur de commutation, un filtre passe-bas, un amplificateur, une deuxième liaison de transmission et un filtre.
PCT/US1992/010962 1991-12-23 1992-12-17 Systeme de transmission televisuelle sans balayage WO1993013611A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP93901165A EP0619057A1 (fr) 1991-12-23 1992-12-17 Systeme de transmission televisuelle sans balayage
JP5511764A JPH07502633A (ja) 1991-12-23 1992-12-17 無走査ｔｖ伝送システム
BR9206980A BR9206980A (pt) 1991-12-23 1992-12-17 Sistema de transmissão de TV sem varredura
FI943010A FI943010A (fi) 1991-12-23 1994-06-22 Keilaamaton TV-lähetysjärjestelmä

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81241791A 1991-12-23 1991-12-23
US812,417 1991-12-23

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WO1993013611A1 true WO1993013611A1 (fr) 1993-07-08

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EP (1) EP0619057A1 (fr)
JP (1) JPH07502633A (fr)
AU (1) AU3327193A (fr)
BR (1) BR9206980A (fr)
CA (1) CA2117346A1 (fr)
FI (1) FI943010A (fr)
HU (1) HUT70716A (fr)
WO (1) WO1993013611A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0870368A1 (fr) * 1995-08-22 1998-10-14 Digital Compression Technology, L.P. Systeme de communication et de mise en memoire par compression

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1262124A (fr) * 1959-06-15 1961-05-26 Western Electric Co Dispositif de transmission d'impulsions de code avec interversion d'une impulsion sur deux
US3715508A (en) * 1967-09-15 1973-02-06 Ibm Switching circuits employing orthogonal and quasi-orthogonal pseudo-random code sequences
US3728529A (en) * 1969-10-08 1973-04-17 Sperry Rand Corp Two-way communication system employing two-clock frequency pseudo-noise signal modulation
US4075427A (en) * 1975-12-02 1978-02-21 Telefonaktiebolaget L M Ericsson System for phase division multiplex duplex communication over a two-wire circuit between a master terminal and a slave terminal
US4293953A (en) * 1979-12-28 1981-10-06 The United States Of America As Represented By The Secretary Of The Army Bi-orthogonal PCM communications system employing multiplexed noise codes
EP0041253A1 (fr) * 1980-05-30 1981-12-09 Nec Corporation Emetteur-récepteur couplé à une ligne de transmission directionnelle d'un réseau de communication multiplex à spectre étalé
US4477900A (en) * 1980-04-30 1984-10-16 Broadcom, Incorporated Successive frame digital multiplexer with increased channel capacity
US4601045A (en) * 1984-08-03 1986-07-15 Larse Corporation Modulator-demodulator method and apparatus with efficient bandwidth utilization
DE4025026A1 (de) * 1989-12-07 1991-06-13 Dirr Josef Verfahren zur codierung von information
US5029210A (en) * 1990-01-29 1991-07-02 Compfax Corp. Cooperative communication system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1262124A (fr) * 1959-06-15 1961-05-26 Western Electric Co Dispositif de transmission d'impulsions de code avec interversion d'une impulsion sur deux
US3715508A (en) * 1967-09-15 1973-02-06 Ibm Switching circuits employing orthogonal and quasi-orthogonal pseudo-random code sequences
US3728529A (en) * 1969-10-08 1973-04-17 Sperry Rand Corp Two-way communication system employing two-clock frequency pseudo-noise signal modulation
US4075427A (en) * 1975-12-02 1978-02-21 Telefonaktiebolaget L M Ericsson System for phase division multiplex duplex communication over a two-wire circuit between a master terminal and a slave terminal
US4293953A (en) * 1979-12-28 1981-10-06 The United States Of America As Represented By The Secretary Of The Army Bi-orthogonal PCM communications system employing multiplexed noise codes
US4477900A (en) * 1980-04-30 1984-10-16 Broadcom, Incorporated Successive frame digital multiplexer with increased channel capacity
EP0041253A1 (fr) * 1980-05-30 1981-12-09 Nec Corporation Emetteur-récepteur couplé à une ligne de transmission directionnelle d'un réseau de communication multiplex à spectre étalé
US4601045A (en) * 1984-08-03 1986-07-15 Larse Corporation Modulator-demodulator method and apparatus with efficient bandwidth utilization
DE4025026A1 (de) * 1989-12-07 1991-06-13 Dirr Josef Verfahren zur codierung von information
US5029210A (en) * 1990-01-29 1991-07-02 Compfax Corp. Cooperative communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0870368A1 (fr) * 1995-08-22 1998-10-14 Digital Compression Technology, L.P. Systeme de communication et de mise en memoire par compression
EP0870368A4 (fr) * 1995-08-22 2002-05-02 Digital Compression Technology Systeme de communication et de mise en memoire par compression

Also Published As

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BR9206980A (pt) 1995-12-05
HUT70716A (en) 1995-10-30
FI943010A0 (fi) 1994-06-22
HU9401888D0 (en) 1994-09-28
FI943010A (fi) 1994-08-22
EP0619057A1 (fr) 1994-10-12
CA2117346A1 (fr) 1993-07-08
JPH07502633A (ja) 1995-03-16
AU3327193A (en) 1993-07-28

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