Abstract: A method of disabling at least a portion of one of a plurality of channels in a digital audio radio system includes the steps of receiving (702) a digitally encoded bit stream over-the-air on the plurality of channels and decoding (704) a selected channel among the plurality of channels. The method further comprises the steps of selectively tagging (706) an undesired type of content on the selected channel, analyzing (708) for an indication of content of the undesired type among the plurality of channels, and selectively disabling (710) at least the portion of the selected channel containing the undesired type of content.

Abstract: A television signal transmitter is arranged by a first frequency converter for up-converting an input signal into an intermediate frequency signal, and a second frequency converter for down-converting the intermediate frequency signal into a television signal of any of channels within a predetermined output frequency band. In this television transmitter, a picture intermediate frequency of the intermediate frequency signal is set to be higher than a maximum frequency of the output frequency band, and is set to be lower than a doubled picture frequency of any one of the channels within the output frequency band by 1.25 MHz.

Abstract: A signal transmitter prevented from outputting an unwanted signal to the outside, which is generated at the time of changing any of various setting parameters such as a channel through which a signal is to be transmitted and the degree of modulation of an intermediate frequency signal to be supplied without deteriorating impedance matching between circuits. This signal transmitter has a local oscillator for outputting a local oscillation signal; a mixer for mixing a supplied television intermediate frequency signal with the local oscillation signal and frequency-converting the resultant signal to a television signal of a specific channel through which the signal is to be transmitted among television channels; and a variable band-pass filter connected at a post stage of the mixer and tuned to the frequency of the specific channel. The tuning frequency of the variable band-pass filter can be shifted out of the frequency band of the specific channel.

Abstract: A system for nonlinear viewing of television show segments is provided by transmitting a main signal and an ancillary signal. The ancillary signal is a short show segment. The television receiver system can select either the main signal or the ancillary signal. The ancillary signal is stored in a small cache memory for later access in place of the main signal. An icon is generated on the television set to notify the user of the presence of the ancillary signal.

Abstract: A modulation factor is kept immune from the influence of temperature variation. A modulator is provided with an operational amplifier to one of whose input ends are inputted video signals and to the other is applied a reference voltage and a video mixer into which are entered carrier wave signals and video signals amplified by the operational amplifier, wherein the reference voltage is raised or lowered as the gain of the video mixer increases or decreases, respectively, with a variation in temperature.

Abstract: A television signal transmitter includes a mixer in which an intermediate-frequency television signal is frequency-converted into a television signal on a channel used for transmission in a predetermined frequency range, a bandpass filter to which the television signal on the channel used for transmission is input and the passband center frequency of which is changed by an applied control voltage, a memory which stores, in the form of digital data, voltages for setting the passband center frequency to equal the frequencies of a plurality of channels in the frequency range, and a D/A converter which converts the digital data into each analog voltage. The analog voltage, at which the passband center frequency equals the frequency of the channel used for transmission, is applied as the control voltage to the bandpass filter.

Abstract: There is provided an information processing method/apparatus for demultiplexing object streams from a datastream which includes a plurality of object streams each having predetermined information, and decoding, synthesizing, and outputting the object streams, wherein the object streams are authenticated, and whether or not the playback control of a predetermined object stream is done before or after decoding of the predetermined object stream is determined in accordance with the method and result of authentication.

Abstract: A tuner of a digital television signal translator tunes to receive an RF digital television signal on a first selected television channel. A demodulator provides a baseband digital television signal from the RF digital television signal to which the tuner is tuned. The baseband television signal includes a data component identifying the first selected channel. A data replacer replaces the data component identifying the first selected channel with a data component identifying a second selected channel different from the first selected channel. The output of a modulator is modulated by the baseband television signal including the data component identifying the second selected channel for transmission as a digital television signal on the second selected channel.

Abstract: A linear compensation system of a digital TV relay or other apparatus preferably includes a transmitting unit configured to modulate a data to an intermediate frequency (IF) signal, up convert the IF signal to an RF signal, and amplify the RF signal to a predetermined level using a high power amplifier (HPA). The system also includes a linear compensation unit to preferably directly vary a step size of an adaptive equalizer according to whether a signal-to-noise ratio (SNR) or an error vector magnitude (EVM) for an output signal of the HPA satisfies an advanced television systems committee (ATSC) or other standard. The linear compensation unit is thus configured to output an improved linear compensation coefficient to a modulator of the transmitting unit.

Abstract: A system for economically extending the effective operational range of an infrared remote control system having a remote control unit with an infrared transmitter, and a controlled device having an infrared receiver. The system includes a first transmitter to receive IR signals from the remote control unit and transmit an RF output signal corresponding to the infrared signal received from the remote control unit. The RF signal is received by an RF receiver which generates a second IR signal corresponding to the received radio signal. The second IR signal is transmitted to and received by the IR controlled device. In some cases, the first IR control signal, and in all cases, the RF, signal include information/data concerning the IR carrier frequency.

Abstract: An insertion box provides a plurality of input and output ports. Each input port corresponds with a predefined and unchanging set of output ports. Insertion of a signal into a particular input port results in that signal being delivered to each of the corresponding output ports. The dissemination functionality is performed by RF circuitry that is typically housed within the insertion box, and is interposed between the input ports and the output ports. The RF circuitry is composed of combiner circuits and splitter circuits. The RF circuitry is designed so that when a combiner is used as an input stage for a splitter, a transformer, usually used to convert an input or output impedance to match a characteristic line impedance, is eliminated. Elimination of such a transformer results in a concomitant reduction in signal loss.

Abstract: A sync generator (genlock) (10) for frequency and phase locking an incoming video signal to a system clock (12) includes a digitizer (16, 22) for digitizing the incoming video signal to yield a digitized color sub-carrier burst component. A numerically controlled oscillator (15) clocked by the system clock generates a phase lock reference signal for locking to the incoming video signal. Phase detection means logic unit (42, 74) sense a static phase offset magnitude from an ideal 90° phase offset between the digitized color sub-carrier burst component and the numerically controlled oscillator output signal. In accordance with the sensed static offset, a static phase error nulling circuit (70) generates a compensating offset in accordance for input to the system clock (27) to drive the static offset to zero, thus achieving frequency and phase locking.

Abstract: System for determining segment settings for a broadcast program. A broadcast video program is received at a broadcast station location from a remote location of video programs and then recorded and stored in a program database, which recorded video program has contained therein a plurality of video segments with start and end times. A central segment timing database is accessed, the central segment timing database having pre-stored segment timing information for at least the recorded video program to define the start and end times of the video segments in at least the recorded video program. The timing information for at least the recorded video program is referenced to a common time reference point. A determination is then made if the segment timing information for at least the recorded video program is stored in the central segment timing database.

Abstract: A method and apparatus for providing an integrated presentation of existing media program services and secondary media program services is described. The method comprises the steps of accepting a election of a secondary media program transmitted on a secondary media program channel; accessing a mapping to determine a primary media program channel associated with the selected secondary media program channel; commanding a first tuner module to receive conditional access information associated with the primary media program channel from the primary service provider; evaluating the conditional access information to determine if a second tuner is authorized to receive the secondary media program channel; and commanding a second tuner module to receive the secondary media program if the second tuner is authorized to receive the secondary media program channel.

Abstract: The present invention relates to a method transmitting images of an on-line publication wherein images with appropriate resolution are automatically selected and transmitted to the client according to a response of the client, thereby largely increasing the transmission speed without interfering the client's reading of the publication.

Abstract: An audio-video multiplexed data generation apparatus of the present invention multiplexes spare video data encoded at a lower frame rate than that of video data together with audio and video data through a spare-video encoder and a spare-video-data storage. An audio-video multiplexed data reproducing apparatus of the present invention decodes spare video data if video decoding is not completed within a predetermined time and, when it becomes possible to complete video decoding within the predetermined time, ordinarily decodes the video data. Multiplexing the low-frame-rate spare video data together with the ordinary video data allows irregularities in reproduced video to be minimized and synchronization between audio and video data to be restored if real-time reproduction becomes difficult to accomplish.

Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively.

Abstract: An RF converter circuit 11 that constitutes a video signal superposing/power deriving unit 100 converts video signals generated from images taken by a surveillance camera 10, which derives a direct current voltage as a driving power from an antenna lead-in wire 6 through a filter circuit (LPF circuit 12), to radio-frequency signals. The radio-frequency signals are transmitted through the antenna lead-in wire 6 to a television receiver 2. Images taken by the surveillance camera 1 can be viewed on the television receiver 2 only by selecting the channel assigned to the surveillance camera 1. Accordingly, the driving power for the surveillance camera 1 is not relied upon a solar battery or secondary batteries, and wiring work therefor may be simplified.

Abstract: A digital television transmitter for an ATSC or NTSC signal includes a digital vestigial sideband modulator having a digital sinusoidal source. A digital multiplier arrangement multiplies a digital signal including the information in the digital television signal by a sequence derived by the digital sinusoidal source to derive plural orthogonally phased digital product signals. A digital lowpass filter arrangement passes low frequency components of the plural digital product signals and rejects high frequency components of the plural digital product signals. A signal combiner arrangement combines a carrier with signals containing information passed by the lowpass filter arrangement necessary to derive a vestigial sideband signal. The combiner arrangement includes at least one digital to analog converter that in different embodiments derives a vestigial sideband signal that modulates an I.F. or R.F. carrier.

Abstract: A system supplies a compressed digital signal to a digital television receiver and includes a source of compressed baseband signal. An encoder encodes the baseband signal in a digital format, and the baseband signal has a frequency. The frequency of the encoded baseband signal is shifted by a first frequency shifter. A first interpolator interpolates an output of the first frequency shifter, a second interpolator that interpolates an output of the first interpolator, and a third interpolator that interpolates an output of the second interpolator. A second frequency shifter shifts a frequency of an output of the third interpolator to produce a signal at a selected channel.

Abstract: A tuning system and a tuning method in a broadcast signal receiver, in which a radio frequency (RF) spectrum signal adopting an inverting method is filtered by an asymmetric bandpass filter of a tuner to improve the receiving sensitivity. This tuning system includes a first mixer, a filter and a second mixer. The first mixer mixes a predetermined oscillation frequency with an inverted 8 VSB digital broadcast signal in the idle space between upper and lower normal NTSC broadcast signals of high frequency band received from a transmitter, transfers the upper NTSC broadcast signal to the lower side and the lower NTSC broadcast signal to the upper side, inverts the transferred NTSC broadcast signals, and changes the state of the 8 VSB digital broadcast signal into a normal state. The filter attenuates the inverted upper and lower NTSC broadcast signals output from the first mixer to a predetermined band and amplifies the normal 8 VSB digital broadcast signal into a predetermined band.

Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively.

Abstract: An apparatus for transmitting multimedia data to a set-top box for distribution to a headend of a cable television. The apparatus includes an input for a signal containing multimedia data. The apparatus has a module for compressing the multimedia data and also a packetizing module. The packetizing module adds a header. Since the headend is the only destination of the multimedia data, a destination address is unnecessary in the header, but the header does include an indicator as to source and an order identifier for each of the packets. The headend can then receive the packets, re-order the packets and decompress the multimedia data. The data may then be processed by a processor at the headend that is assigned at the beginning of an interactive session.

Abstract: An audio/visual distribution system includes head end equipment for receiving a radio frequency audio-visual (A/V) signal from an information source, and a plurality of transmitters and receivers. The transmitters are coupled to the head end equipment and tune to any of a plurality of RF channels, convert the RF signal to a baseband A/V signal and transmit the baseband signal over twisted pair cabling for a distance of up to 2000 feet. The receivers receive the baseband signal and reconvert the baseband signal to an RF signal. The transmitters utilize differential drivers which receive voltages from a filtered split supply power source in order to drive the baseband signals over twisted pairs. The receivers include equalizers utilized in conjunction with the video signal, and differential amplifiers. The receivers generate NTSC baseband (stereo) audio and video signals and/or an RF signal.

Abstract: A cable distribution system with distributed architecture that can accommodate both digital and analog subscribers. Each home has at least one Room Interface Unit (RIU), one for each television. There is a local service module associated with a group of RIUs (e.g., one for every ten RIUs). There is also a local headend in the vicinity. The local headend has a block of integrated tuner/receiver/decoders that can be controlled to tune in a selected video channel. The selected video channels and a group of standard channels are multiplexed and sent to the local service modules where a group of programmable converters (one for each RIU) place the channel selected by its corresponding RIU at a predetermined frequency. Each of the RIUs associated with a particular local service module receive the corresponding channel. Depending upon whether the subscriber has subscribed to digital or analog service, they will have either a digital or an analog RIU.

Abstract: A digital imaging system generates a composite video signal and the carrier frequency of a desired television channel is generated internal to the imager integrated circuit. The carrier frequency is then amplitude modulated with the composite video signal by either digital or analog means located on-chip. Thus, a radio frequency signal that can be picked up by conventional television receivers is directly synthesized on-chip to provide a wireless video link.

Abstract: A signal mutiplexer that combines the NTSC and DTV signals of adjacent television channels into a composite signal for transmission on a common transmission line or wave guide. Separate hybrid couplers and band pass filters produce quadrature phase signals that are combined in a signal combiner to produce a pair of quadrature phase multiplexed signals. A notch filter reflects the aural component of the NTSC signal. An output hybrid coupler combines the pair of multiplexed quadrature phase signals with the reflected aural component to produce the composite signal.

Abstract: A method for displaying video data is proposed, where the video data are loaded from a data carrier in a car radio as a radio receiver and transmitted via an interface to an electronic assistant, which then takes on the task of decoding and reproducing the video data. Accompanying audio data are then decoded and reproduced either by the car radio or the electronic assistant.

Abstract: A receiver for processing a VSB modulated signal containing terrestrial broadcast high definition television information and a pilot component includes an input analog-to-digital converter (19) for producing a datastream which is oversampled at twice the received symbol rate, and a digital demodulator (22; FIG. 3) with a data reduction network (330, 332) in a phase control loop. A segment sync detector (24; FIG. 4, 5) uses an abbreviated correlation reference pattern to recover a twice symbol rate sampling clock for the digital converter (19). A DC offset associated with the pilot component is removed (26; FIG. 6) from the demodulated signal before it is applied to an NTSC interference detection network (30; FIG. 7). The interference detection network includes a comb filter network (710, 718) responsive to a twice symbol rate sampled data datastream, and exhibits a sample delay dimensioned to avoid aliasing in the combed frequency spectrum (FIG.

Abstract: A system for providing a common transport signal comprising an analog information signal and a digital information signal including a transmitter and a receiver for the common transport signal is disclosed. The transmitter includes an analog information signal modulator, placing the analog information signal onto a first intermediate frequency, a digital information signal modulator, placing a digital information signal onto a second intermediate frequency, a first upconverter and amplifier for upconverting the analog information signal, and a second upconverter for upconverting a frequency translated digital information signal. The system includes a power combiner for adding the upconverted analog and digital information signal to form a common transport signal. The receiver includes a signal receptor and conditioner, a signal splitter and dual signal recovery chains; each chain including at least a downconverter, a bandpass filter and intermediate frequency amplifier, and a signal demodulator.

Abstract: A digital broadcast receiver with a noise suppressing function which can effectively suppress noise components included in a reception signal without being accompanied with an auditory uneasiness for the user. A level of noises included in the reception signal is detected, one or more of a plurality of noise suppressing circuits of different functions are properly combined in accordance with a situation of the detection, and a noise suppressing process is executed. The combination is changed step by step in accordance with the noise level. In another example, the control is made on the basis of an attenuation value of a reception field intensity.

Abstract: A video/audio system includes an interface device that receives a plurality of audio and video signals from a plurality of sources. The interface device combines these signals into various combinations and transmits the combinations to a receiver. The receiver is configured to interface one of the combinations of signals with a user. In this regard, the receiver allows the user to select one of the combinations, and in response, the receiver separates the video signal(s) of the selected combination from the audio signal(s) of the selected combination. Then, the receiver renders the video signal(s) via a display device and produces a sound defined by the audio signal(s) via a speaker. Accordingly, the user is able to control which set of audio and video signals are interfaced with the user.

Abstract: A data broadcast program control system is made up of a transmission apparatus for repeatedly transmitting a plurality of data elements that constitute a data broadcast program, and a broadcast apparatus for receiving and broadcasting the plurality of data elements. The transmission apparatus generates control information for instructing the broadcast apparatus to perform change processing on the constitution of the data broadcast program, and transmits the control information to the broadcast apparatus. The broadcast apparatus receives the control information, and performs the change processing on the constitution of the data broadcast program according to the control information. The broadcast apparatus broadcasts the data broadcast program whose constitution has been changed.

Abstract: The present invention relates to a digital television relay system for relaying wirelessly a broadcasting signal discharged from a broadcasting station. In order to cover shadow areas of the digital broadcasting channel signal discharged from a digital television transmitter, the present invention receives the broadcasting channel signal of a certain frequency discharged from the broadcasting station, performs channel-decoding, compensates a transmission error occurred in space, and relays it wirelessly to a subscriber in the shadow areas. Accordingly, the present invention can provide a digital television broadcasting service with transmission quality same with the broadcasting station to the subscriber in the shadow areas.

Abstract: A transmitter unit for receiving a channel signal and transmitting a representation of the channel signal to a monitoring location. The transmitter unit includes an encoder unit which compresses the received channel signal to a selectable bit rate. The encoder also converts the compressed channel signal to a packet signal for transmission to the monitoring location via a telecommunication link and adjusts a packet rate of the packet signal to conform to the bit rate of the compressed channel signal. The transmitter unit also includes an infrared control unit for receiving a demultiplexer command signal from the encoder unit and transmitting the demultiplexer command signal by an infrared signal.

Abstract: Multiple channel maps are embedded in a television transmission and the appropriate channel corresponding to the particular television service used by the viewer is downloaded for use with the television receiver. Each channel map is accompanied by a channel map identifier which identifies the source of the television transmission and a geographic identifier. The source of a television transmission is automatically detected by monitoring the radio-frequency spectrum allocations of telecast stations. The geographic area identifier is determined by comparison with a user inputted geographic area identifier. The channel map having a channel map identifier corresponding to the detected television transmission source and the user inputted geographic area identifier is downloaded and stored for future use.

Abstract: Advertising spots are generated globally, and are subsequently adapted to satisfy one or many local applications. The adaptations are initiated most preferably by an advertiser through encrypted Internet access to a hub in real time. Adaptations, station verification, adapting the actual video/audio stream, logging and invoicing are all performed automatically and in real time. Consequently, an advertiser can modify a global spot for one or more local broadcasts, and can immediately ascertain effectiveness of the modification. Various modifications to the basic steps are disclosed that further enhance the utility of the method.

Abstract: Multiple streams of data are streamed to a user's terminal with images from different cameras. Low resolution thumbnail images tell the user what image streams are available. A focus stream provides high resolution images from a selected camera. A user can switch the focus stream to another stream by clicking on the associated thumbnail. The users can also be provided with a thumbnail of panoramic image. Other data streams sent to the user can contain (a) audio data, (b) interactivity markup data which describes regions of the image which provide interactivity opportunities such as hotspots, (c) presentation markup data which defines how data is presented on the user's screen, (d) a telemetry data stream which can be used for various statistical data. One data stream contains a low quality base image for each data stream which can be enhanced to form a high resolution focus image.

Abstract: An Internet Video Recording system and method, for enabling recording and management of dynamic Web content, such that changed content can be automatically captured and viewed at the user's convenience. Accordingly, the user navigates to the desired destination, presses the recording button, fills in, confirms and configures the recording parameters. The software monitors elected content for changes, and records the chosen Web site content each time the elected content changes. The user can subsequently use the application of the present invention to view and manage the tracked content at his/her convenience. Content changes from a plurality of sources can similarly be detected and recorded in parallel.

Abstract: A signal formatting apparatus for use in a television transmission system, the apparatus comprising: an enhanced content input for receiving enhanced content streams in a predefined input format; a plurality of enhanced content outputs for outputting enhanced content data in a plurality of formats for transmission to receivers of respective types; and a signal formatter for forming the enhanced content data by processing the enhanced content streams to put each of the enhanced content streams in the respective format.

Abstract: A video signal processor reduces the deterioration of image quality due to the superposition of noise on a sync signal included in a luminance signal. A frequency discriminator outputs a first error signal if a ratio of the frequency of a frequency-modulated signal during a sync-signal interval to the frequency of a reference frequency signal is smaller than a predetermined ratio. Alternatively, the discriminator outputs a second error signal if the ratio is greater than the predetermined ratio. If the first error signal has been input to a frequency controller a preset number of times or more during an interval before the second error signal is input thereto, the controller instructs a frequency modulator to increase the frequency of the frequency-modulated signal.

Abstract: A radio receiver for receiving a selected digital TV signal uses final intermediate frequency signals the carrier frequencies of which are multiples of symbol rate. The radio receiver has a match filter receptive of rectified samples of digitized intermediate-frequency signal and responsive to the amplitude of the intermediate-frequency carrier being modulated in accordance with the field synchronization code group to generate a pulsed response to the beginning of each data field. This pulsed response is used to determine when data segment synchronization information should occur, so its detection is more certain to be accurate and data segment synchronization is more rapidly determined. Symbol synchronization is rapidly inferred from the field synchronization and data segment synchronization, so that the samples in each data line can be counted.

Abstract: A system and method for utilizing a single feed line for feeding multiple UHF, VHF, and FM broadcast antennas. The system and method employ notch, lowpass, and bandpass filters in conjunction with a splitter to separate two channels transmitted over the same antenna feed line.

Abstract: A digital/analog TV receiver is provided comprising a broadcasting signal receiver for receiving broadcasting signals of both ground wave and cable wave, a main controller which carries out the process of full-range scanning including a transmission route examining step of automatically specifying the transmission route of a broadcasting signal and a channel examining step of automatically specifying the channel of the broadcasting signal received from the transmission route, and a memory for holding a channel map where the channel of each broadcasting signal is stored. The main controller can carry out the transmission route examining step to check the receipt of the ground wave broadcasting signal of a digital form by the broadcasting signal receiver and automatically examine from the result of the checking whether the broadcasting signal is received from the ground wave transmission route or the cable wave transmission route.

Abstract: A wireless transmitting and receiving apparatus for wirelessly transmitting a video signal to a remote display apparatus, a transceiver therefor, and a channel determining method for determining a channel to be used in transmitting and receiving a video signal between transmitting and receiving apparatuses are provided. The video signal transmitting apparatus comprises a super heterodyne-type transmitter which selects one of a plurality of channels, modulates a video signal to be transmitted, and provides the modulated signal to an antenna; and a frequency band and channel selector which controls a modulation and demodulation frequency of the transmitter. The apparatus enables wireless transmission and reception of a video signal between a video signal processing apparatus and a remote display apparatus.

Abstract: A television signal transmitter is arranged by a first frequency converter for up-converting an input signal into an intermediate frequency signal, and a second frequency converter for down-converting the intermediate frequency signal into a television signal of any of channels within a predetermined output frequency band. In this television transmitter, a picture intermediate frequency of the intermediate frequency signal is set to be higher than a maximum frequency of the output frequency band, and is set to be lower than a doubled picture frequency of any one of the channels within the output frequency band by 1.25 MHz.

Abstract: This invention provides an apparatus capable of performing time slip playback even upon occurrence of a network trouble. This invention relates to an apparatus which, when a network trouble occurs, acquires, of multimedia data, a point representing the position of multimedia data which has already been transmitted to a network, and after the network recovers, transmits multimedia data subsequent to the point to the network.

Abstract: A digital radio frequency transmitter system having an input circuit for receiving digital signals to be amplified and transmitted. A digital-to-analog converter converts the digital signals into analog signals. A series circuit is provided including a radio frequency filter and a radio frequency amplifier located downstream from the converter and wherein the filter and the amplifier respectively introduce linear and non-linear distortions into the analog signals for transmission by the transmitter. A digital pre-correction circuit is located upstream from the digital-to-analog converter for pre-correcting the digital signals in a manner to compensate for at least some of the distortions. An analog pre-correction circuit is interposed between the digital-to-analog converter and the series circuit for pre-correcting the analog signals to additionally compensate for at least some of the distortions prior to application to the series circuit.

Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference is the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively.

Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively.