Abstract: There is provided a combined TV and FM radio receiver for selectively receiving TV and FM radio signals via a single tuner using a digital intermediate frequency (IF) stage. The receiver includes a tuner that selects TV band or FM radio band signals and converts the selected signals into IF signals or primary sound IF signals; an IF processor that generates local oscillating signals depending on whether a current mode is a TV mode or an FM radio mode, and converts the IF signals and/or primary sound IF signals, into baseband signals and secondary sound IF signals, respectively; a video demodulator that extracts video signals; an audio demodulator that extracts TV audio signals and FM radio signals according to TV sound or FM radio mode data; and a controller that controls the tuner, and the IF processor, and applies the TV sound or FM radio mode data to the audio demodulator.

Abstract: Disclosed in a digital broadcasting receiver comprising first means for performing pre-scan processing for successively tuning in on channels previously set, to examine whether or not a received signal on each of the channels is of a predetermined quality or more, and temporarily registering the channel numbers of the channels on which the received signals are of the predetermined quality or more in a storage device as receivable channel candidates, and second means for performing normal scan processing for successively tuning in on the receivable channel candidates temporarily registered in the storage device by the first means, to acquire and register necessary channel information.

Abstract: An equalizer for a VSB receiver, which enables equalizations using segment synchronization information, has an extraction unit extracting the segment synchronization information included in the VSB broadcast signal, a storage unit storing the extracted segment synchronization information, and an equalization unit equalizing the VSB broadcast signal based on the segment synchronization information stored in the storage unit. The storage unit stores the segment synchronization information extracted from the extraction unit by field unit or by unit of N data segments within the field according to a channel state. More stable equalizations can be carried out in channel environment changes by storing segment synchronization information by the predetermined number of data segments and equalizing data within a corresponding data segment in a training mode while using the segment synchronization information every matching number of data segments.

Abstract: An object of the present invention is to switch a television signal or an FM broadcasting signal by a small number of active elements, to input the switched television signal or FM broadcasting signal to an input tuning circuit, to reduce loss in the television signal when the television signal is received, and to reduce interference due to the FM broadcasting signal when the television signal is received.

Abstract: For receiving a voice FM broadcast it has so far been necessary to separately provide an SAW filter and a voice intermediate frequency amplifier circuit and the freedom of circuit design has been limited. In the present invention there is used a variable filter circuit 15 (a variable filter means). The variable filter circuit 15 allows an intermediate frequency signal (IF) to pass therethrough, the intermediate frequency signal being outputted from a mixing circuit 14 as a constituent of a tuner means. The variable filter circuit 15 can change a limitation on the frequency band of the intermediate frequency signal passing therethrough. The frequency band of the intermediate frequency signal passing through the variable filter circuit 15 is thereby limited according to the type of a received broadcasting radio wave, and a VCO circuit 32 (a variable oscillator means) is controlled so as to change the oscillation frequency of an oscillation signal.

Abstract: In this system, an instructor's device for teaching how to operate a personal computer is bidirectionally connected to a student's device for learning how to operate a personal computer, via a communication line of various types. The instructor's device has a personal computer as a lesson device, together with a TV monitor, a terminal, etc. for a videophone. The student's device 3 has a PC 1 as a lesson device, together with a TV monitor, a terminal 34, etc. for a videophone. The instructor and the student have a lesson on the personal computers, together with watching the TV monitors respectively.

Abstract: In a data multiplexing device which multiplexes and transmits the transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream packets, a program distribution system, a program transmission system, a pay broadcast system, a program transmission method, a conditional access system, and a data reception device according to the present invention, by generating a scramble key Ks corresponding to one or more data elements among the plurality of data elements constituting a program and by scrambling each data element, an audience can subscribe for each data element.

Abstract: An information processing system and apparatus receiving a television broadcast includes: a direct receiving unit directly receiving television broadcast waves; an indirect receiving unit indirectly receiving the television broadcast waves; and a switching unit determining whether the television broadcast waves are to be received by the direct receiving unit or the indirect receiving unit by switching between the direct receiving unit and the indirect receiving unit based on their reception conditions. With this configuration, it is possible to obtain television-broadcast video signals from the selected receiving unit. The indirect receiving unit is preferably formed of a communication device provided with a wireless cellular telephone function using a wideband code division multiple access (W-CDMA) system in which signals having a large transmission capacity can be transmitted and received, or a communication device provided with a wireless LAN communication function.

Abstract: The present invention involves a system, apparatus, and method for providing private in-band data to digital set-top boxes in a broadcast environment. In one example, a digital set-top box conforming to the present invention includes one or more programmatic identifiers, such as a manufactures identification, a product identification, and software application identifications. On a channel and at a time, the set-top box receives a broadcast transmission of in-band update data, such as profile data or software code, with matching identifiers. Upon receipt of the broadcast transmission having matching identifiers, the in-band update data is stored in a memory of the set-top box or the appropriate application is modified.

Abstract: A remote control transmitter is provided with an AUDIO key for switching an audio mode in sound multiplex broadcasting and an ENTER key for determining various types of selections. When the ENTER key is operated in a state where the audio mode is temporarily selected by operating the AUDIO key, the state where the audio mode is temporarily selected is treated as the steady selection corresponding to setting on a menu screen.

Abstract: A modulator generates a combined signal consisting of audio and video signals and converts the combined signal to one of a plurality of frequencies in dependence upon a desired output frequency and broadcast standard. The modulator includes a summing amplifier, a first frequency synthesizer and a second frequency synthesizer. The summing amplifier has a first input for receiving a video signal, a second input for receiving a first audio signal, a third input for receiving a second audio signal, and an output for outputting a modulated summed signal. The first frequency synthesizer generates a first frequency for mixing with the modulated summed signal to generate a high intermediate frequency (HI-IF) signal. The second frequency synthesizer generates a second frequency for mixing with said HI-IF signal to generate a desired RF output signal.

Abstract: Between a mixer and an intermediate frequency amplifying circuit, there are an intermediate frequency tuning circuit which, for reception of a TV signal, is tuned between a chrominance subcarrier frequency and a video intermediate frequency in an intermediate frequency band, and for reception of an FM broadcasting signal, is tuned nearly to the chrominance subcarrier frequency, and a first trap circuit which attenuates a sound intermediate frequency of an adjacent channel. Next to the intermediate frequency amplifying circuit, there is a second trap circuit which, for reception of a TV signal, brings about attenuation between the video intermediate frequency in the intermediate frequency band and the sound intermediate frequency of the adjacent channel and, for reception of an FM broadcasting signal, brings about attenuation around the video intermediate frequency.

Abstract: In a method of automatic gain control for both TV and FM radio signals, the TV and FM radio signals are controllably amplified (AGC-AMP) to obtain amplifier output signals, the amplifier output signals are tuner processed (F, MIX, IF-AMP) to obtain tuner output signals, the tuner output signals are applied as control signals (T-AGC) to the controllable amplifier (AGC-AMP), a bandwidth of a thus formed AGC loop being wide enough for a TV channel, and the tuner output signals are narrow-band filtered (CF) to obtain narrow-band filtered signals having a bandwidth substantially corresponding to a bandwidth of an FM radio channel.

Abstract: Techniques for calculating the system characteristic of the adaptive filtering used for equalization and echo-suppression in a digital communications receiver, such as one used for receiving over-the-air broadcast digital television signal, are described. In these techniques, the system characteristic of the adaptive filtering is calculated from the discrete Fourier transform of successive portions of the input signal supplied to the adaptive filtering and from the discrete Fourier transform of corresponding portions of the transmitted signal, as estimated in the receiver. Receivers for implementing these techniques in various ways are also disclosed.

Abstract: In a broadcast system in which computer data and other content are delivered from multiple content servers to multiple clients at least partly over a broadcast network, a transmission announcement system announces upcoming broadcast transmissions and instructs the clients on how to receive the broadcast transmissions. Announcement servers (which may or may not be the same as the content servers which serve the data for the broadcast transmissions) generate announcements containing information specifying how associated upcoming transmissions are to be delivered over the broadcast network. The announcement server makes the announcements available to the clients over the broadcast network or over a secondary link other than the broadcast network.

Abstract: The invention relates to the simultaneous operation of items of electrical apparatus, such as but not exclusively, a broadcast data receiver and a DECT telephone system. A problem with this type of apparatus is that the operating frequencies of the same can overlap and in turn cause interference in the operation of the respective items. The invention provides a method for identifying the overlap of the RF ranges of the apparatus, and having identified the same, adjusting the operating characteristics of one of the items to allow the interference to be avoided or minimized and the opportunity for the items of apparatus to be combined into one unit.

Abstract: A carrier wave NTSC component or a VSB pilot signal in an IF signal is extracted and judged. Then, on the basis of the judgment result, either of demodulation circuit 13 and 14, which is appropriate for the received broadcast wave is switched. Information of co-broadcasting programs for analog and digital broadcasts are acquired from EPG and memorized. In case of high-speed channel search, analog broadcast is preferentially switched to. In case of co-broadcasting, the analog broadcast program is displayed on the screen at the beginning, and then, the digital broadcast program is switched when the data decoding is completed.

Abstract: A gain deviation is leveled in the same band by using a varactor diode having the same characteristics as that used in an input tuning circuit for coupling the input tuning circuit and a high frequency amplifier The input tuning circuit has a tuning varactor diode whose tuning frequency varies with a tuning voltage applied to the cathode of the tuning varactor diode, a high-frequency amplifier is provided in a stage subsequent to the input tuning circuit, and a coupling varactor diode for coupling the input tuning circuit to the high-frequency amplifier, in which the cathode of the coupling varactor diode and that of the tuning varactor diode are connected with each other and a bias voltage higher than the voltage at the anode of the tuning varactor diode and lower than the lowest voltage of the tuning voltage is applied to the anode of the coupling varactor diode.

Abstract: An electronic tuner has an input terminal, a mixer receiving the signal fed into the input terminal, a matching circuit connected to an output of the mixer, a band-pass filter connected to an output of this matching circuit, an intermediate-frequency (IF) amplifier connected to an output of the band-pass filter, and an output terminal receiving output of the IF amplifier. These circuits are composed of balanced circuits and connected by balanced lines. The mixer has a high output impedance. For the matching circuit, the impedance of the matching circuit at the band-pass filter side is equal to the impedance of the band-pass filter at the matching circuit side. This structure can realize an electronic tuner having low power consumption.

Abstract: A microcomputer 50 discriminates a CATV channel plan mode only if there is a continuous channel among the channels that have been judged that station is present as a result of determination in the case where the count number for a TV channel plan is smaller than the count number for a CATV channel plan. However, in the case where there is no continuous channel among the channels that have been judged that station is present, the microcomputer 50 also discriminates a CATV channel plan mode if there is a continuous channel among the channels of the error data as a result of determination. That is, even when a station adjacent to the normal broadcasting channel is falsely tuned owing to spurious reception, the continuity of the CATV channel can be judged normally.

Abstract: A television receiver intended to decrease the number of expensive SAW filters to achieve low cost and a compact design. A trap circuit is interposed between a mixer and a SAW filter. During reception of a television signal, one of the trap frequencies at which the trap circuit responds is set to a video intermediate frequency on a television channel adjoining above an intermediate frequency band or a nearby frequency. The other trap frequency is set to a sound intermediate frequency on the adjoining television channel or a nearby frequency. During reception of an FM broadcast signal, the frequency of the FM broadcast signal is converted into a color subcarrier frequency on the intermediate frequency band or a nearby frequency. One of the trap frequencies is set to a substantially middle frequency between the video intermediate frequency and color subcarrier frequency on the intermediate frequency band.

Abstract: A combination tuner includes a switching circuit having three transistors which are selectively turned on and off so that one of a television signal received by a first signal receiving unit using an external antenna that is a high sensitivity antenna, an FM signal received by a second signal receiving unit using an internal antenna that is a low sensitivity antenna, and an FM signal received by the first signal receiving unit using the external antenna is selected according to three-mode band data. Therefore, the combination tuner can select an antenna for receiving a desirable FM signal according to the reception field intensity of the target FM signal so that the FM signal can always be reproduced successfully.

Abstract: In a digital broadcast communications system, a higher priority component and a lower priority component are broadcast from a transmitter to a receiver. Each of these components generates a main and a supplemental signal, and each supplemental signal is advanced in time with respect to the corresponding main signal. The main and supplemental signals for both the higher and lower priority components are combined into a single signal, which is broadcast to a receiver. In the receiver, the time advanced supplemental signals are stored in a buffer to time align them with their corresponding main signals. Both main signals are processed in the normal manner in the receiver, and are also monitored to detect a fading event. When a fading event is detected, the corresponding buffered supplemental signals are substituted for the faded main signals and normal processing continues.

Abstract: A trap circuit system includes a first trap portion and a second trap portion. In the first trap portion, a first capacitor is provided in parallel to a first switch diode. A control voltage is applied to the cathode of the first switch diode so as to change the trap frequency. In the second trap portion, a control voltage is applied to the cathode of a varactor diode so as to change the trap frequency. In the trap circuit system, when a television signal is received, the video intermediate frequency signal and the audio intermediate frequency signal in the lower adjacent channel are attenuated. When an FM broadcast signal is received, the video intermediate frequency signal and the chrominance subcarrier frequency signal are attenuated.

Abstract: The present invention provides a television tuner input circuit having satisfactory selection properties free from influence by half of signal frequencies to be received. The television tuner input circuit of the present invention has a tuning circuit and a high pass filter cascaded to the tuning circuit, wherein: the tuning circuit is switched to a low band or high band television signal reception state; when the tuning circuit is switched to a low band reception state, a cutoff frequency of the high pass filter is set lower than the minimum frequency of the low band; and when the tuning circuit is switched to a high band reception state, a cutoff frequency is set lower than the minimum frequency of the high band and higher than half of the maximum frequency thereof.

Abstract: An image trap filter disposed between the low noise amplifier and the mixer of a radio frequency receiver that overcomes the adverse effect of process variations on image signal rejection for both a single-band radio frequency receiver and a multi-band radio frequency receiver by setting the image trap filter response at the center of the band of interest at production test. The image signal problem is presented at the input of the radio frequency receiver and the image trap filter is adjusted for the desired frequency response.

Abstract: A TV signal receiving tuner which is small in size and inexpensive due to a reduced number of local oscillators. In the TV signal receiving tuner, a local oscillation signal output from a local oscillator is directly applied to a first mixer through a first programmable divider to receive a UHF TV signal, the local oscillation signal output from the local oscillator is applied to the first mixer after its frequency is divided to 1/3 by the first programmable divider to receive a VHF high-band TV signal, and the local oscillation signal output from the local oscillator is applied to the first mixer after its frequency is divided to 1/5 by the first programmable divider to receive a VHF low-band TV signal.

Abstract: There is provided a television tuner which is small and inexpensive, so that although a television signal and an FM broadcast signal have different electric field strengths in band and signal, one circuit can receive both the television signal and the FM broadcast signal. A television signal is frequency-converted to the intermediate-frequency band of a television. An FM broadcast signal is frequency-converted to a voice intermediate frequency in the intermediate-frequency band. A first parallel tuned circuit and a second parallel tuned circuit are connected in parallel with each other in an intermediate-frequency tuned circuit. When the television signal is received, the television signal is tuned to a broad band by only the first parallel tuned circuit. When the FM broadcast signal is received, the FM broadcast signal is tuned to a narrow band by the first parallel tuned circuit and the second parallel tuned circuit.

Abstract: An input switching circuit for a television tuner includes first and second switching circuits provided between first and second input terminals to which a television signal and an FM broadcasting signal are input and an output terminal. The second switching circuit passes the FM broadcasting signal when receiving the FM broadcasting signal while blocking the FM broadcasting signal when receiving the television signal between the second input terminal and the output terminal. The second switching circuit includes first two diodes connected in series with each other between the second input terminal and the output terminal, which are turned off when receiving the television signal and turned on when receiving the FM broadcasting signal; and a second diode connected between the node between the first two diodes and the ground, which is turned on when receiving the television signal and turned off when receiving the FM broadcasting signal.

Abstract: A method for searching a predetermined satellite channel by making use of information available from the satellite. The method comprises three steps. The first step is searching for a service channel from the satellite, if found than the user look up table is updated with this information. A second step is updating the user look up table by using the receiver look up table, which is implemented in the satellite receiver. The third step is the conventionally search through the entire band till the predetermined channel is found.

Abstract: For use in a digital television receiver, there is disclosed a system for receiving audio and video digital signals. The system comprises a digital network interface coupled to a digital main board for receiving baseband audio and video digital signals and a digital video decoder coupled to the digital network interface for decoding audio and video digital signals from the digital network interface. The digital video decoder sends the decoded signals to the digital main board. The system also comprises an analog television chassis having an input that is capable of receiving audio and video analog signals. The digital main board digitizes the analog signals into a digital transport stream prior to processing.

Abstract: A television tuner includes a mixer circuit for receiving a television signal or an FM signal, and a local oscillator circuit for generating an oscillation signal received by the mixer circuit. When the television signal is received, a television intermediate-frequency signal is generated by the mixer circuit. When the FM broadcast signal is received, an FM intermediate-frequency signal having a frequency converted to about 10.7 MHz is generated by the mixer circuit.

Abstract: A system and method for providing on demand information at a display device includes a microprocessor that is connected to a radio data service signal receiver and a display device. The radio signal contains the data source for the on-demand content rather than the display device tuner. The microprocessor causes information from the radio data service signal to be decoded and displayed at the display device when requested by a user.

Abstract: The present invention realizes a small-size and inexpensive television tuner's intermediate frequency tuning circuit that can be used for both television intermediate frequency signals and FM broadcast signals frequency-converted to 10.7 MHz. The television tuner's intermediate frequency tuning circuit comprises: a parallel tuning circuit to both ends of which a television intermediate frequency signal or an FM broadcast signal frequency-converted to 10.7 MHz is inputted; a series tuning circuit connected in parallel to the parallel tuning circuit; and a switch, connected in parallel to a capacitive element of the series tuning circuit, that is closed when the intermediate frequency signal is inputted, and opened when the FM broadcast signal is inputted, wherein the respective tuning frequencies of the parallel tuning circuit and the series tuning circuit are set to 10.

Abstract: This invention allows to connect TV-Sets, Audio-Receivers or other Entertainment-Devices to be connected to the receiver or converter of a satellite dish or cable network using only this single electronic apparatus with multiple output-ports and controlling the connected device using its inherent control mechanisms. The electronic apparatus functions in a master slave mode and adjusts automatically for the desired frequency or channel selection of the device connected to its port. No other control devices are required for the electronic apparatus to operate as the slave for the set connected to its ports.

Abstract: In an image intermediate-frequency processing apparatus, in addition to a first phase locked loop (PLL) for receiving a television broadcast, there is provided a second PLL including a voltage controlled oscillator (VCO), two frequency-dividing units, a reference signal generating unit, a phase-comparing unit, and a filter. When receiving FM broadcast, a stable oscillation output obtained from the VCO is input into an audio intermediate frequency detector, to obtain an audio signal of high quality.

Abstract: A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.38 MHz. The final IF signal is digitized for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The presence of the pilot carrier accompanying a selected VSB HDTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode.

Abstract: A device for canceling co-channel interference and a method thereof are provided. The device, in a simulcast receiver for receiving a high definition television (HDTV) signal having a digital format and an analog broadcasting TV signal, includes a detector for detecting a synchronous signal from the analog broadcasting TV signal and outputting a detection signal, a co-channel interference rejection filter for removing co-channel interference from a first input signal including co-channel interference and outputting a second input signal, and a selector for selecting either the first or second input signal according to the detection signal. Therefore, the presence or absence of co-channel interference can be accurately determined regardless of channel environment.

Abstract: A receiver includes a tuner that converts an FM radio broadcast signal into an intermediate frequency signal that has the same frequency as a sound intermediate frequency subcarrier signal when receiving the television broadcast signal and outputs the intermediate frequency signal when receiving the FM radio broadcast signal, a SAW filter passing only an intermediate frequency band of the output of the tuner, a video detector detecting a video signal containing a sound subcarrier signal when receiving the television broadcast signal and detecting a sound subcarrier signal when receiving the FM radio broadcast signal, a VIFAGC circuit making the video signal have a constant amplitude, and an AGC circuit making a sound subcarrier signal output from a band pass filter have a constant amplitude.

Abstract: A flat panel multimedia display system (210), detachable or non-detachable type, of a multimedia portable computer (60), plasma or liquid crystal multimedia display system (300), a multimedia cellular telephone (40), and multimedia receiver system (200) are used to display video and audio multimedia information generated for televisions, digital radio, cellular telephone systems, portable computers, and all other multimedia devices. By connecting the newly invented multimedia receiver system (200) to the display system (210) of the multimedia portable computer system (60), and plasma or liquid crystal multimedia display system (300), a user can watch television programs, listen to radio, or browse Internet at any time and at any locations.

Abstract: A multiple tuner arrangement is formed on a single integrated circuit having a common radio frequency input terminal. The terminal supplies a broadband input signal to a plurality of individual tuners, which may be identical to each other in construction. The tuners operate simultaneously and independently of each other to convert a channel in the radio frequency input to the appropriate output intermediate frequency and supply this to the channel output terminal. Features such as a databus interface and a common reference oscillator for channel frequency synthesisers need not therefore be duplicated.

Abstract: The present invention provides a digital video receiving apparatus for displaying a plurality of digital TV pictures on a plurality of receiving terminal apparatuses. The digital video receiving apparatus includes a tuner for extracting the received digital TV multiplexed signal, a demodulator for decoding the digital signals provided from the tuner, a demultiplexer for demultiplexing the multiplexed signals outputted from the demodulator to obtain a bit stream including a video signal, an audio signal and a data signal. The digital video receiving apparatus further includes a video decoder, an audio decoder and a data decoder for decoding signals outputted from the demultiplexer. The digital video receiving apparatus decodes the input multiplexed digital TV signal and outputs a video signal, an audio signal and a data signal corresponding to respective programs.

Abstract: The present invention refers to musical television systems. The transmitting device comprises an audio signals control processor, a video signals control processor, a voice signals processor, permanent memory devices for data storage of musical accompaniment and background images, cartridges with musical accompaniment and background images, a matrix of switches, a liquid crystal display, an audio card, internal and external microphones, a mixer; a modulated high-frequency radio signals generator and a low-frequency television signals generator. Television receivers are capable of reception of the modulated high-frequency radio signals at an aerial input, and of low-frequency television signals at a video input. The system possesses the expanded functional characteristics.

Abstract: The present invention resides in the provision of an intermediate frequency circuit in a television tuner capable of enlarging the attenuation of a audio IF carrier in an adjacent channel without increasing a loss in an intermediate frequency band. The intermediate frequency circuit comprises a mixer which outputs an intermediate frequency signal, an intermediate frequency amplifier for amplifying the intermediate frequency signal outputted from the mixer 1, and a feedback circuit disposed between an input end and an output end of the intermediate frequency amplifier, and in the intermediate frequency circuit, a audio IF carrier of an adjacent intermediate frequency signal adjacent to the intermediate frequency signal is fed back from the output end to the input end of the intermediate frequency amplifier by the feedback circuit.

Abstract: A digital receiver for receiving an analog host signal with one or more digital sidebands includes a bandreject filter arranged at least in part in an intermediate frequency (IF) processing stage of the receiver. In an illustrative embodiment, first and second digital sidebands are transmitted on either side of a frequency modulated (FM) analog host signal in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The received composite signal is filtered in the IF processing stage of the receiver by the bandreject filter in order to substantially attenuate the analog host signal while passing the digital sidebands. The bandreject filter may be arranged in the IF processing stage so as to filter the analog host signal from the composite signal at a point prior to an input of an automatic gain control (AGC) circuit, such that the AGC operating point is determined primarily by the digital sidebands.

Abstract: In a system for optimizing television reception by a television receiver receiving a diversity of input signals from a plurality of antennas, one of a plurality of combiners and television tuners selects the strongest combination of input signals for viewing and another scans the various combinations of input signals searching for a combination significantly stronger than the combination being viewed. A plurality of multiplexers selects the output signal of one combiner and transmits the selected signal to one of the tuners. A signal evaluation module evaluates the strength of the combinations of input signals and compares the strength of each combination of input signals to the strength of the viewing signal, looking for a superior signal. A control processor controls the combination of input signals selected by the combiners and the combiner output signal selected by the multiplexers.

Abstract: A television signal receiving tuner that is capable of receiving at least terrestrial television broadcast signals includes a trap circuit for attenuating frequency-modulation broadcast-band signals. The trap circuit attenuates frequency-modulation broadcast-band signals that are in proximity to the desired terrestrial television broadcast signals or are broadcast within a band that are received at one half of the frequency of the desired terrestrial television broadcast signals.

Abstract: A digital signal transmission system transmits MPEG data packets including normal packets for transmission as a normal bit stream and robust packets comprising information for transmission as a robust bit stream for receipt by a receiver device. A first encoding device is provided for encoding packets belonging to each robust and normal bit streams. A control device tracks individual bytes belonging to the robust and normal bit streams. A formatter device formats tracked bytes of packets belonging to the robust bit stream and, a trellis encoder device produces a stream of trellis encoded bits corresponding to bits of the normal and robust streams. The trellis encoder additionally maps the trellis encoded bits of both robust and normal bytes into symbols. A second encoding device responsive to the control device applies a non-systematic Reed Solomon encoding to formatted packets belonging to the robust bit stream when a backward compatibility mode is indicated.

Abstract: An automatic radio frequency signal switching circuit is equipped with a plurality of AV input terminals and adopts an analog/digital adapter to transform all respective input analog signals into high level digital signals and a central processor is used to memorize the sequential orders of the respective AV signals which are sequentially output in a last-in-first-out manner to a television. At the same time, the central processor shuts off the ANT/CATV signal amplifier and the RF switch thereof so as to effect automatic switching operation. When no AV signals from AV equipment are being input, the central processor will instantly transmit another set of high electric level signals to the ANT/CATV signal amplifier and a power source of the RF switch thereof and the ANT/CATV signals are delivered to a television via the RF amplifier and the RF switch thereof whereby effect automatic RF switching operation.

Abstract: Method for reproducing data streams, in particular of broadcast data, comprising the steps of: receiving at least one receiving data stream (RDS); providing a reproducing data stream (PDS) on the basis of said receiving data stream (RDS) and/or of derivatives (D-RDS) thereof; reproducing said reproducing data stream (PDS); including into said reproducing data stream (PDS) and thereby reproducing at least parts (S2,1-S2,6) of a second data stream (DS2) and/or of derivatives (D-DS2) thereof instead of said receiving data stream (RDS) in response to a first control signal; and generating said derivatives (D-RDS) of at least parts (S1,1-S1,7) of said receiving data stream (RDS).