Matches 601 - 650 out of 691 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >
Match Document Document Title
4908707 Video cassette recorder programming via teletext transmissions  
A system for video recorder programming using existing television broadcast teletext transmissions. The programs required are chosen from schedules displayed on teletext pages, the necessary...
4907292 Television tuner  
A television tuner for three frequency ranges (I, II, III) comprises a common antenna connection (4) for corresponding input filter circuits. The input filter circuits (1, 2, 3) of the two higher...
4905087 UHF FM receiver having improved frequency stability and low RFI emission  
A UHF receiver which converts UHF modulated carrier signals to baseband video signals without any heterodyne or frequency conversion stages. A bandpass filter having a fixed frequency first filters...
4905306 Filter switching arrangement for a tuner  
In a tunable filter including first and second inductors, a varactor diode, and a bandswitching diode connected intermediate the inductors to select the inductor configuration for first and second...
4901036 Frequency synthesizer with an interface controller and buffer memory  
A frequency synthesizer which has at least one programmably characterized phase lock loop circuit includes a buffer memory and an interface controller responsive to operational codes received from...
4897727 Television tuning system allowing rapid response to user initiated commands  
The operation of a tuner of a television receiver for tuning nonstandard, as well as standard, frequency RF television signals, requiring a relatively long time for completion, is partitioned into...
4891708 Voltage superposing circuit for an electronic tuner  
A pulse signal whose duty ratio differs for selected channels is coupled with the base of a first transistor as a switching transistor. The switching transistor is connected at the collector to a...
4888819 Television on channel selecting apparatus with sequential selection of auxiliary signal source  
A television on channel selecting apparatus arranged such that when two antenna inputs are switched, the switching operation for the second antenna input is included in the switching operation for...
4868660 Circuit arrangement for unobjectionable switching between TV-channels as in a TV receiver  
A TV receiver having circuitry for precluding objectionable display patterns during channel switching includes a frame store for successively storing frames of video signal being displayed. A...
4855835 AFT circuit for CATV receiver system  
An automatic fine tuning (AFT) circuit for a CATV receiver system of a double conversion type having a first local oscillator and a second local oscillator and a first mixer and a second mixer...
4837627 Programmable operating-parameter control appatatus for a television receiver  
A programmable auxiliary control unit for a television receiver has switch selectable features which enable it the receiver to interface more easily to a variety of signal sources, by controlling...
4819069 Television signal selection device  
A television signal selection device comprising the fact that a band to-be-searched within a channel is checked successively from the upper side toward the lower side thereof with a video signal...
4805230 Tuning method  
In a tuning apparatus of frequency synthesizer system comprising an input circuit means including a channel switch and a shift switch, a microcomputer and a phase-locked loop circuit including a...
4771332 Tuning apparatus for the VHF band of a television receiver  
A channel selection circuit selects signals of a desired frequency from television signals. A channel interpretation circuit determines whether or not the signals thus selected are low-band or...
4760325 High frequency coil arrangement  
A high frequency coil arrangement, comprising an input side coil and an output side coil electromagnetically coupled with each other, the input side coil being divided into two coil elements having...
4742564 Tuning alignment data memory device for tuning circuits tunable to selectable frequencies  
The invention relates to a tuning memory device for tuning circuits to selectable frequencies and in which digital tuning data corresponding to said frequencies are stored in a programmable memory....
4737993 Cable broadcast TV receiver with automatic channel search responsive to mode change  
A "cable-ready" receiver includes a controller for selecting broadcast ("air") and cable channels tuned by a tuner. When switching between air and cable tuning modes the controller stores the...
4736456 Tuning system for television sets  
An automatic alignment system for the tuner of a television receiver with a controlled high-frequency preamplifier stage and an intermediate-frequency amplifier that has a reference circuit with a...
4733301 Signal matching signal substitution  
A signal matching signal substitution system includes a tuner for selectively receiving signals in respective television channels with an input gain control for controlling the signal output level...
4731871 Tuning device for liquid crystal television  
A tuning device of a liquid crystal television at first tunes by a PLL synthesizer system, and then maintains an obtained tuning voltage by an AFT signal for deciding an intermediate frequency...
4727426 Digital television receiver with memory refreshing circuitry  
Method and apparatus for use with a television receiver wherein a television signal is processed in a digital form and which includes a memory for storing data to control such processing, in which...
4717970 Video system with programmable VCR  
A video system includes a VCR coupled to the output of a summation circuit that has two inputs. The first input is supplied from an active splitter and the second from a UHF modulator/upconverter...
4636864 Television receiver comprising a circuit for sequentially tuning the receiver to different frequencies  
In a television receiver, comprising a tuning portion (1) which operates in time-division multiplex and a first memory circuit (41) for storing sub-picture information from different transmissions...
4635121 Arrangement for the programmable control of a radio and/or television receiver  
When programming a radio and/or television receiver for future transmissions, problems may occur due to overlapping of the programmed transmissions. For this purpose the individually programmed...
4627101 Muting circuit  
A television receiver has provisions for a second audio program (SAP) and an indication for signifying when the SAP is present and a muting circuit for muting the SAP, both in response to the...
4594611 Station selecting method for television receiver  
A method for tuning a television receiver in which an optimum local oscillator frequency is selected for offset stations. A local oscillator frequency of the receiver is incremented in steps of a...
4581643 Double conversion television tuner with frequency response control provisions  
In a double conversion tuner for a television receiver including a first local oscillator and a first mixer for converting the RF signal corresponding to a selected channel to a first IF signal and...
4575761 AFT arrangement for a double conversion tuner  
A double conversion tuner stabilized against drift includes a first local oscillator included in a phase locked loop (PLL) and a second local oscillator included in an automatic fine tuning (AFT)...
4574308 FM Video receiver  
An FM video receiver includes a UHF tuner coupled to an intermediate frequency amplifier. The output of the IF amplifier is coupled to a video IF amplifier and detector. The latter component is...
4567523 Television receiver input circuit  
A television receiver of the type capable of displaying standard VHF and UHF televison signals is provided with a single coaxial antenna input terminal. A passive input circuit within the receiver...
4551755 Television bandwidth correcting system  
A television bandwidth correcting system for use with a television receiver or television tuner in which the quality of the displayed picture, defined by the bandwidth of the video signal, is...
4539711 Tuning control system for a pair of tuners employing a common channel skip memory  
The use of a single skip list memory for two or more tuners is made possible by indexing the starting point of a scanning selection operation to the last channel tuned by the tuner which is to be...
4536797 Television receiver with auxiliary on-screen display  
As a signal seeking tuner tunes through a number of channels to locate the next active (useable) channel, the display screen of a television receiver is blanked when the receiver is tuned between...
4527194 Channel assignment for CATV system  
A CATV channel assignment system and method for arranging CATV channels in a tiered fashion facilitates selective viewer access to predetermined groups of CATV channels. A "logical" channel number...
4516170 Dual mode UHF tuning system  
A tuning system employing a UHF tuner for tuning a television receiver over the UHF band and the ultraband is disclosed. The system employs indirect frequency synthesis in providing user initiated,...
4510623 Television channel lockout  
An electronically tuned television receiver is provided with a channel lockout feature to control viewer program selection. The television receiver has a tuner local oscillator (101), the frequency...
4499495 Switching diplexer for single antenna input television receivers  
The VHF and UHF tuners of a television receiver are coupled by a switchable diplexing circuit to a single antenna input terminal. The diplexing circuit includes a first electronic switching means...
4488179 Television viewing center system  
At least two television reception tuners are used in a viewing center system, one for the television signals and the other for supplementary information transmitted during the blanking intervals...
4484221 Shared counter arrangement for a digital frequency locked loop tuning system for selectively measuring the frequencies of the LO and IF signals  
In a tuning system of a television receiver, the local oscillator (LO) signal and IF picture carrier are selectively coupled to the clock input of the same down counter. The down counter is...
4461037 Automatic tuning system for television receiver  
An automatic tuning system for a television receiver. A first binary-coded signal circuit comprising a plurality of comparators for encoding in a binary signal a signal output from a frequency...
4451850 Channel selecting device  
A frequency synthesizer type of the channel selecting device using a PLL wherein the local oscillation output is frequency-divided by a predetermined frequency dividing ratio according to a channel...
4442547 Counter arrangement useful in a frequency locked loop tuning system for measuring the frequency of a local oscillator signal  
A counter arrangement for measuring the frequency of a local oscillator signal produced in a television tuning system includes a main down counter and an auxiliary down counter. Prior to a...
4428006 Television receiver for receiving sound multiplex signals  
A television receiver capable of reproducing pictures and at least two audio channels from incoming broadcast video signals and also capable of receiving a video and audio signals from a video tape...
4425578 Monitoring system and method utilizing signal injection for determining channel reception of video receivers  
A system and method is provided for determining the channel to which a video wave receiver is tuned. The system includes an RF signal source connected to the antenna input of the video wave...
4422096 Television frequency synthesizer for nonstandard frequency carriers  
In a phase locked loop (PLL) tuning system for a television receiver, the capability of tuning channels with RF signals with non-standard frequencies arbitrarily near the respective standard...
4408172 Variable speed tuning selector  
A touch sensitive variable speed tuning selector is disclosed. A rotary tuning selector knob includes a finger contact coupled to touch sensitive circuitry. Tuning selector rotation causes a shaft...
4399463 Signal detector circuit  
A circuit for detecting the presence or absence of a television receiving signal is disclosed, wherein a detection output for automatic frequency control is compared with first to fifth levels. A...
4387400 Tuning system for a television receiver  
A tuning system is described for use with a television receiver which has channel selection keys on a keyboard for selecting a desired television channel. The system employs a frequency synthesizer...
4385315 Phase locked loop tuning control system including a timed sync activated AFT signal seeking arrangement  
In a phase locked loop PLL tuning control system for a voltage controlled oscillator of the type wherein an automatic fine tuning (AFT) voltage is selectively applied to the local oscillator after...
4379269 RF Amplifier having automatic gate bias switching in response to band selection  
Herein disclosed is an RF amplifier which is equipped with a high-frequency amplifying element such as a dual gate MOS FET having its first gate fed with a bias voltage and its second gate fed with...
Matches 601 - 650 out of 691 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >