Abstract: A video signal transmission and reception system includes a video signal receiver in a video signal reception module, a video signal transmitter in a camera module, and a specific video signal transmitter in a specific camera module. In the specific camera module, a frame signal generated by a frame signal generator is sent to the video signal receiver from the specific video signal transmitter. The frame signal is sent to the video signal transmitters in a plurality of the camera modules from the video signal receiver.

Abstract: The present invention provides a method for determining a local oscillator frequency for a baseband converter, comprising obtaining characteristics of a channel comprising a plurality of radio signals at corresponding radio frequencies; using the channel characteristics to select a local oscillator frequency to use in baseband conversion of the plurality of radio signals of the channel to form a first baseband converted signal and a second baseband converted signal; and programming a local oscillator to operate the selected local oscillator frequency; wherein the local oscillator frequency is selected such that an image rejection ratio of the baseband converted second signal to an image of the baseband converted first signal is above a predetermined threshold.

Abstract: HDMI is a digital audio and video communications protocol commonly used in consumer electronics. HDMI is particularly synonymous with high fidelity audio and video. Even though HDMI is a digital communications protocol, the audio quality can be impaired by analog signal impairments and distortions even if there are no digital decoding errors. In particular, the very process by which the audio is converted from Digital (HDMI) to human audible “Analog Audio” can be prone to errors. This occurs when the Digital to Analog Converter (DAC) clock, which is derived from the HDMI TMDS clock or HDMI source, is “distorted” due to its jitter, resulting in erroneous sampling or outputting of vital audio samples, thereby reducing the audio quality of the experience. The present invention reduces the jitter on the TMDS clock, and hence the audio DAC clock, resulting in lower audio distortion.

Abstract: There is provided a delta-sigma A/D converter including a first integrator, a second integrator located on an output side of the first integrator, a quantizer located on an output side of the second integrator, and a first current D/A converter receiving an output of the quantizer and providing a negative feedback signal to an input side of the quantizer.

Abstract: A method is for monitoring the electrical integrity of lines of photosites of an imaging device with matrix array of photosites. The control lines of photosites may include for each line of photosites an emission of elementary electrical control signals for the photosites of the line. The method may include diagnosis of the elementary electrical control signals emitted.

Abstract: A digital signal transmitter in which multiple data streams are each transmitted by modulation of a respective frequency band within one of a group of frequency channels, the frequency bands each occupying no more than a predetermined maximum bandwidth less than or equal to the channel width; comprises means for transmitting at respective frequency positions within each frequency channel, one or more instances of band information defining the frequency bands corresponding to all of the data streams carried within that frequency channel, the one or more instances being arranged so that any portion of the frequency channel equal in extent to the predetermined maximum bandwidth includes at least one instance of the band information.

Abstract: There is provided a video processing device capable of reducing the influence of a disturbance of an input vertical synchronization signal. When the synchronization signal detecting unit detects an input of the input-side vertical synchronization signal at a predetermined cycle, the synchronization signal control unit outputs the input-side vertical synchronization signal, which has been input, as an output-side vertical synchronization signal, and, when the synchronization signal detecting unit detects an input of a next input-side vertical synchronization signal before the predetermined cycle elapses after the output of the output-side vertical synchronization signal, a next input-side vertical synchronization signal input before the predetermined cycle elapses is not output as a next output-side vertical synchronization signal, and an input-side vertical synchronization signal input further next is output as the next output-side vertical synchronization signal.

Abstract: A test system (200) for testing for missing or shorted parts within a tuner circuit includes a signal generator (202) for applying a harmonic-containing baseband time varying RF test signal to the tuner circuit. The tuner circuit is tuned to a harmonic of test signal. A detector 208 coupled to the baseband IF output of the tuner circuit detects the voltage generated in response to the applied RF test signal. A voltage measurement device (210) measures voltage detected by detector to provide an indication of the gain. Significant changes in the gain indicate missing part(s) or short circuits.

Abstract: Various embodiments are described herein for a universal television receiver that is capable of processing television channel signals broadcast according to a variety of analog and digital broadcast standards. Analog processing includes using coarse filtering with pass bands that are wide enough to accommodate frequency shifts in a desired television channel signal and analog circuitry variability and digital processing includes tracking a carrier frequency of the desired television channel signal to generate and apply a frequency shift feedback signal to compensate for frequency shifts in the carrier frequency.

Abstract: A multi-standard integrated television receiver is disclosed. According to the invention, a RF tracking filter is provided to receive a RF signal and then filter out a fifth order and above harmonics and a band-pass filter is provided to further eliminate harmonics. Moreover, a double quadrature mixer is provided to remove third order harmonics. Accordingly, the quality factor requirement of the RF tracking filter and the linearity requirement of the band-pass filter are relaxed. Thus, the RF tracking filter and the band-pass filter can be fully integrated without any external components.

Abstract: A receiver apparatus 3 has a digital circuit portion 13 that converts a compressed digital signal outputted from a digital demodulating portion 12 into digital video and audio signals and a video/audio output circuit 14 that converts the digital video and audio signals outputted from the digital circuit portion 13 into analog video and audio signals. With this configuration, a video/audio processing IC for digital signal processing no longer needs to be mounted on the circuit board of a video display apparatus 4, and thus a receiver system can be realized with a video display apparatus having a simple configuration.

Abstract: A system includes a filter and a tuner formed on an integrated circuit. The filter receives an input signal comprising a first number of channels and communicates an intermediate output signal comprising a second number of channels less than the first number of channels. The tuner is coupled to the filter and receives the intermediate output signal and communicates an output signal comprising a third number of channels less than the second number of channels.

Abstract: In this cable for a display, the respective ones of two power supply lines are arranged on both sides of an electric signal line to hold the electric signal line therebetween, and a protective coating is formed to have a flat outer shape.

Abstract: A metal frame body has first to fourth side plates and is divided, by a shield plate provided in the metal frame body, into a first compartment area near the first side plate and a second compartment area near the second side plate. A distributor is arranged in the first compartment area and a tuner unit is arranged in the second compartment area. A first connector is arranged in a position on the third side plate adjacent to the first compartment area and a second connector, which is connected to the distributor, is arranged in a position on the fourth side plate adjacent to the first compartment area. The distance from the second side plate to the central axis of the first connector is equal to the distance from the second side plate to the central axis of the second connector.

Abstract: A television tuner device includes a metal frame, including a shielding plate which separates the space defined by the metal frame into a first chamber at a first side plate and a second chamber at a second side plate opposite to the first side plate; a distribution unit may be disposed in the first chamber; a tuning unit disposed in the second chamber includes a mixer circuit converting a television signal into an intermediate-frequency signal, an oscillator provides the mixer circuit with an oscillated signal, and a phase-locked-loop (PLL) circuit controls the oscillation frequency of the oscillator; and a crystal oscillator disposed in the first chamber provides the PLL circuit with a reference signal.

Abstract: A high frequency amplifier for amplifying inputted television signals; a mixer for subjecting the television signals which have been amplified to frequency conversion into intermediate frequency signals; a SAW filter for selecting, out of the intermediate frequency signals, intra-range intermediate frequency signals emerging in a range within a prescribed intermediate frequency band; and an intermediate frequency amplifier for amplifying the intra-range intermediate frequency signals are provided, and wide band detecting means for detecting the intermediate frequency signals inputted to the SAW filter and generating a first AGC voltage is provided to control a gain of the high frequency amplifier with the first AGC voltage.

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: A multi-stage channel select filter and associated methods are disclosed that can be used, for example, with receiver architectures and associated methods that are also described herein. The multi-stage channel select filter can include a plurality of cascaded stages including at least one tunable stage. Each stage can include a digital mixer, a low pass filter and a decimator, with the decimator for each tunable stage including a tunable decimator having a decimation rate selection signal as an input. In addition, each non-tunable stage, if any are utilized, can include a decimator having a fixed decimation rate. In operation, the first cascaded stage is configured to receive a digitized channel signal spectrum, and the last cascaded change is configured to output a baseband signal representative of a desired channel within the digitized channel spectrum.

Abstract: In a television signal receiver for receiving and processing television signals (RF) that comprise modulated video signals and modulated audio signals, a tuner (16) receives selected television signals and furnishes at least intermediate frequency (IF) signals, a SAW filter (17) is connected to the tuner (16), a video demodulator (18) demodulates the video signals from the SAW filter (17) to obtain demodulated video signals for further processing, a generator (16) supplies signals (SIF) comprising the modulated audio signals on a carrier frequency equal to the difference between a carrier frequency of the modulated video signals and a carrier frequency of the modulated audio signals in the television signals, an audio demodulator (5) demodulates audio signals from the signals (SIF) from the generator (16) to obtain demodulated audio signals for further processing. According to the invention, the generator (16) is connected with the tuner (16) and the audio demodulator (5) is connected with the generator (16).

Abstract: A TV tuner unit uses a frequency-selective element before or after the resonance stage of either a UHF or VHF tuner for separation of UHF signals from VHF signals. Thus, performance is preserved while eliminating the need for circuitry including high and low pass filters and related switches.

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: 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 semiconductor integrated circuit in which a band-pass filter, a sound detector, and some other circuits are formed on a single semiconductor substrate. The output signal from an AM detector is passed through a high-pass filter to obtain, substantially, an FM sound signal. A gain variable amplifier controls the amplitude of the FM sound signal and passes the signal through the band-pass filter to extract substantially, an FM sound carrier signal. The amplitude detector monitors the amplitude of the sound carrier signal and applies negative feedback to the gain variable amplifier so that the amplitude is kept constant. Thus, the influence of noise from the band-pass filter is reduced, and degradation of signal-to-noise ratio can be prevented.

Abstract: A SECAM decoder and an FM modulator therefor are disclosed, in which a demodulated color signal is provided to indicate deviations in the frequency of modulated color information from a nominal subcarrier frequency. The demodulator comprises numerator and denominator filters operating on the modulated color information, and a divider providing a ratio result by dividing the numerator filter output by the denominator filter output. The demodulator may include two sets of numerator and denominator filters offset in phase from one another, where one of the two sets is selectively employed in order to mitigate divide-by-zero problems. Also disclosed are methods for demodulating digitized FM color signals in a SECAM decoder.

Abstract: In a video transmission system which transmits video data through an ATM network, the ATM network sets up fixed virtual connections between transmitters and a receiver. In the receiver, a connection control portion designates a desired one of the virtual connections and a header controller only extracts cells of the designated virtual connection.

Abstract: An aural carrier signal is corrected in a common amplifier system wherein the correction serves to reduce cross-modulation distortion of the aural carrier signal caused by non-linearities of the common amplifier system. An aural corrector receives a modulated visual carrier signal comprised of a visual carrier signal modulated by a video baseband signal and a phase corrected aural carrier signal and provides therefrom a combined corrected aural carrier signal. The visual carrier signal is combined with the combined corrected aural carrier signal to provide a corrected output carrier signal.

Abstract: Apparatus for reproducing data from a selected digital television signal, transmitted in packet form as vestigial-sideband (VSB) amplitude-modulation (AM) of a carrier, has a tuner for selecting a digital television signal and converting it to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter before synchrodyning to baseband in the digital regime. VSB synchrodyning circuitry synchrodynes the digitized final intermediate-frequency signal to baseband in the digital regime to generate in-phase and quadrature-phase baseband signals. The quadrature-phase baseband signal is lowpass filtered to generate an automatic frequency and phase control (AFPC) signal for controlling a local oscillator in the tuner, so that the in-phase baseband signal comprises digitized VSB symbol coding. Symbol decoding circuitry responsive to the VSB symbol coding generates a digital data stream.

Abstract: An intermediate-frequency (IF) coupled-circuit for a television tuner is provided, which is connected between an IF amplifying stage and a video-signal-selection filter, and which comprises a parallel circuit having a second capacitor connected in parallel to a series circuit having a resistor for impedance matching, an inductor, and a first capacitor which are connected in series, wherein the series circuit resonates at the frequency component of the selected channel, and the parallel circuit resonates at the frequency component of the channel lower than and adjacent to the selected channel, thereby functioning as a trap for removing the frequency component of the channel lower than and adjacent to the selected channel.

Abstract: A circuit for automatically discriminating audio intermediate frequencies of a received television signal that has a simple, compact and inexpensive circuit structure and can operate stably.

Abstract: Television signal reception apparatus for receiving a television signal selected from among transmitted television signals of different types includes a respective receiver portion for each of the different types. The current reception or non-reception of NTSC signal is detected by ascertaining whether or not 4.5 MHz intercarrier sound intermediate-frequency signal is generated in the receiver portion used for NTSC signal reception. When reception of NTSC signal is detected, the television signal reception apparatus is automatically conditioned for selecting the demodulated NTSC signal for further processing.

Abstract: In a television receiver having a tuner 2 for converting a received signal from an antenna 1 to an intermediate frequency signal and supplying the intermediate frequency signal to a homodyne detector circuit through a filter device to extract a video signal, a variable frequency oscillator is provided for changing the frequency of the intermediate frequency signal such that the frequency of beat components between a local oscillating signal of the tuner and a harmonic signal of the intermediate frequency signal is coincident with a trap frequency of the filter device. The occurrence of interference due to the intermediate frequency signal introducing into the antenna can be prevented by a simple configuration.

Abstract: A video intermediate-frequency signal processing device capable of receiving FM broadcasts, includes a first FM detecting unit for demodulating an intermediate-frequency signal from a sound intermediate-frequency detecting unit using a phase-locked loop, and for furnishing a demodulated FM signal, a second FM detecting unit for detecting or demodulating a reference signal applied to generate a reference DC voltage, a comparator for obtaining a difference between the modulated FM signal from the first FM detecting unit and the reference DC voltage from the second FM detecting unit, and for furnishing, as a sound signal, a signal having a value corresponding to the difference, and a feedback unit for, when receiving FM broadcasts, filtering the output of the comparator, and feeding the filtered output back to a low-pass filter of a phase-locked loop included in a video detecting unit.

Abstract: A receiver which receives two-channel multiplex broadcasting by using television sub audio. Two-channel data and/or facsimile data which are multiplexed on the broadcasting sub audio band of the television broadcasting wave including a video band, a main audio band and a sub audio band are displayed, printed and output. The receiver may have a device for displaying and printing data multiplexed on the sub audio band of the FM broadcasting wave, and further may have a device for displaying a television picture. The receiver may perform only one, some or all of the functions of displaying, printing and outputting multiplexed data.

Abstract: Radio receivers for receiving DTV signals, in accordance with the Advanced Television System Committee (ATSC) standard, or analog TV, in accordance with the National Television Systems Committee (NTSC) standard, each use a single first detector for both types of signal. This single is followed with an intermediate-frequency amplifier providing amplification both for digital television signal and for the amplitude-modulated NTSC video carrier of an analog television signal. Preferably, the shared intermediate-frequency amplifier is a high-band intermediate-frequency amplifier having fixed gain and having its bandwidth determined using a surface-acoustic-wave filter with flat-amplitude midband response, steep-slope skirts, and linear phase throughout its passband.

Abstract: During a period of transition from broadcasting analog TV signals to broadcasting digital TV signals, digital TV reception is susceptible to disruption owing to co-channel interference by analog TV signals. During this same transition period usually a digital TV receiver will incorporate an auxiliary analog TV receiver. This auxiliary analog TV receiver is advantageously used during digital TV signal reception for determining the amount of co-channel interference by analog TV signals, so that comb filtering can be selectively applied to symbol coding recovered from the digital TV signal, for suppressing artifacts of co-channel interfering analog TV signal when they are large enough to have substantial adverse on symbol decoding. The amount of NTSC co-channel interference is estimated by detecting the level of intercarrier generated by mixing the audio and video signals of the analog TV signal.

Abstract: Amplitude modulator comprising a differential input pair receiving a modulating input signal, and a Gilbert cell multiplying a carrier signal by the modulating input signal; anda second differential pair of transistors receiving the carrier signal, and the output signal of which is added to the output signal of the Gilbert cell.

Abstract: A video signal detection circuit of the present invention is provided with a trapping circuit which traps frequencies corresponding to color sub-carrier wave signal components and which is disposed between a phase comparing circuit and a voltage controlled oscillation circuit in a PLL circuit performing synchronous detection.

Abstract: A circuit configuration for intermediate frequency demodulation for a video signal processing device includes an intermediate frequency filter to which an input signal converted to an intermediate frequency is delivered, and a mixer for demodulation with a simulated video carrier. In a further branch, the video carrier is eliminated from the input signal by a bandpass and converted in an oscillator into reference signals being mutually phase offset by 90.degree.. A phase tracker ensures that the phase and frequency of the simulated video carrier are correct relative to the signal to be demodulated. The phase tracker contains in each of two branches a mixer and a low pass, through which a component separation of the video signal to be demodulated is carried out. The reference signals are weighted in further mixers with determined equisignal components and combined into the simulated video carrier.

Abstract: A detecting circuit for a composite signal containing a video signal and an audio signal. A filter for attenuating the video and audio signals is provided in a PLL circuit loop disposed in the detecting circuit, thus the video or audio signal component generated in the output of the PLL circuit can be reduced and a beat component is not generated in the output of the detecting circuit.

Abstract: An automatic gain control circuit for controlling gain according to a sound gain controller so as to output a stable video intermediate frequency signal includes a first gain control amplifier receiving a video intermediate frequency signal, for amplifying the signal by a sound gain control voltage and for then producing an amplified video intermediate frequency signal, a second gain control amplifier receiving a carrier signal having a sound intermediate frequency signal and a video intermediate frequency signal, for amplifying the carrier signal by the sound gain control voltage and for then providing the amplified carrier signal, and a sound gain control voltage detecting circuit for receiving the amplified signal from the second gain control amplifier, for detecting the sound gain control voltage and for then providing the detected sound gain control voltage to thereby automatically control the gain of said first gain control amplifier.

Abstract: To provide a picture intermediate frequency circuit capable of preventing the occurrence of intermodulation beats in a strong electrical field, without affecting in any way the original picture signal. A picture intermediate frequency signal output from the tuner 2 is supplied to a pre-amplifier 5 via an adjacent sound trap circuit 4, and picture trap circuits 11 and 12, both of which are connected in series. Trap circuits 11 and 12 have an attenuation point in the upper and lower frequency components, respectively, equivalent to the frequency difference of the adjacent picture signal frequency with respect to the picture intermediate frequency signal, and trap the .+-.6 MHz frequency components of the picture intermediate frequency signal. This allows the trap circuits 11 and 12 to remove unnecessary adjacent picture signals before they reach the pre-amplifier 5.

Abstract: A vestigial-sideband amplitude-modulation transmitter using a balanced modulator for generating a suppressed carrier that is in quadrature phasing with the video carrier of a television signal receives as modulating signal a binary phase-shift-keying (BPSK) signal encoding digital signals. The quadrature transmission reduces the visibility of the lower-frequency PSK sidebands in the TV signal as viewed on screen. The symbol rate of the PSK is made to be a multiple of the horizontal line scan rate of video signal. To reduce the visibility of the higher-frequency PSK sidebands in the TV signal as viewed on screen, the BPSK is transmitted twice during respective frames of successive pairs of data frames, which data frames recur at the same rate as video frames. To reduce the interference of video with the BPSK, the BPSK is comb filtered at the digital signal receiver and after symbol detection is subjected to partial-response filtering for recovering the digital signal originally encoded in the BPSK signal.

Abstract: A sound carrier detecting circuit for use in a television or a video tape recorder is disclosed. During the sound carrier detection, the carrier frequency of the sound signals is corrected by utilizing pulse width modulation signals output from a microprocessor, so that the noise due to shifting of the detected frequency can be eliminated. The circuit includes a key input part provided with one or more keys for selecting a tuning state, and a microprocessor for outputting pulse width modulating signals and manual sound tuning signals in response to appropriate settings of the key input means. A variable oscillating part for converting the pulse width modulating signals into dc component signals and, in turn, outputting variable frequency signals in accordance with the level of the dc component signals is provided alongside a frequency modulating and oscillating part which oscillates and outputs set frequency signals set to a specific frequency in accordance with the relevant broadcasting method.

Abstract: In a television receiver a downconverter responding to a selected television signal respectively supplies its first and second output signals as the input signals of first and second IF amplifiers, respectively. The downconverter includes a local oscillator for generating oscillations at a frequency controlled in response to the AFT signal. The first IF amplifier includes a first adjacent-channel sound carrier trap, in consequence whereof the first-IF-amplifier response is substantially reduced for the downconverted picture carrier, and an in-channel sound carrier trap. Responsive to the first-IF-amplifier response, a video detector generates a composite video signal in which sound beats are suppressed to relatively low level by the first adjacent-channel sound carrier trap.

Abstract: In TV receiving apparatus, a first IF amplifier chain comprises a first gain-controlled amplifier followed in cascade connection by a second gain-controlled amplifier, and a second IF amplifier chain comprises a third gain-controlled amplifier followed in cascade connection by a fourth gain-controlled amplifier. The second and fourth gain-controlled amplifiers are controlled similarly by an AGC signal, and the first and third gain-controlled amplifiers are controlled similarly by that AGC signal delayed in similar amounts. An RF amplifier is gain-controlled responsive to that AGC signal delayed even more, and a downconverter supplies first detector response to amplified RF, which first detector response is applied to the first and second IF amplifier chains by respective frequency-selective filters. The first IF amplifier response is downconverted to generate sound IF. The second IF amplifier response is detected to recover video signal.