Abstract: Systems (100) and methods (500) for controlling operations of an electronic device. The methods comprise: using a rotary knob having a single rotatable part to select a first circuit to perform operations of the electronic device during a first time and to select a second circuit to perform operations of the electronic device during a second time; and using the single rotatable part of the rotary knob to additionally change preset functions for the first circuit at the first time and a second circuit at the second time, where a degree of rotation of the single rotatable part corresponds to a desired preset function input selected from a plurality of possible preset function inputs.

Abstract: In a double-tuning circuit including a primary tuning circuit having a first inductor and a first variable capacitive element connected in parallel and a secondary tuning circuit having a second inductor and a second variable capacitive element connected in parallel, a fixed part of a copper-foil pattern is connected to a connection point at which the double-tuning circuit is connected to an input terminal of a frequency mixing circuit, and a tip part of the copper-foil pattern extends to near the first inductor, whereby a trap circuit for attenuating an image frequency component is formed. A pattern is formed between a ground-side terminal of the first inductor and the ground, and a capacitor is connected between a connection point at which the first inductor is connected to one terminal of the pattern and a ground-side terminal of the second variable capacitive element.

Abstract: A media content monitoring system uses a rack adapted to receive multiple carrier boards to improve the system's ability to be configured to specific applications. Each carrier board contains tuner modules for receiving AM/FM broadcasts, satellite radio broadcasts, TV audio broadcasts, HD, IBOC, DAB and DRM digital radio broadcasts, etc. The tuner modules produce a USB output that is combined by a USB hub on the carrier boards into a single USB output. The carrier board outputs are in turn combined by a rack based USB hub into single USB output that is provided to a host computer. The host computer includes content identification software that automatically identifies selected media content received by the tuner modules and stores the selected content in a database. The host computer can send control codes to the tuner modules to alter their reception parameters.

Abstract: A broadcast signal receiving apparatus includes: a connecting unit through which a broadcast signal is input/output; a first tuner that is provided to be integrated with the connecting unit and tunes the broadcast signal input through the connecting unit; and a second tuner that is connected to the connecting unit via a cable and tunes the broadcast signal input through the connecting unit.

Abstract: One embodiment of a tuner integrated circuit includes two mixer circuits, an IF amplifier circuit, three oscillation circuits, a PLL circuit, and a reference oscillation circuit. A plurality of terminals are provided at two sides of the tuner integrated circuit and are connected to these elements. Among the terminals, at least an oscillator-connecting terminal for connecting an externally provided oscillator to the reference oscillation circuit, a power supply terminal through which a power supply voltage is supplied, and a ground terminal connected to a ground are provided at one side of the tuner integrated circuit. The power supply terminal and the ground terminal are disposed adjacent to the oscillator-connecting terminal such that they sandwich the oscillator-connecting terminal therebetween.

Abstract: A process for refurbishing analog set top tuner/decoders which are not compatible with digital cable to convert same into a digital set top tuner/decoder which can tune any channel on a digital cable system and convert the digital data received on that channel into a video signal. The process comprises forming a replacement circuit and mounting said replacement circuit on the motherboard of the target set top tuner/decoder and then making circuit breaks at the appropriate points on the motherboard of said target set top tuner/decoder and connecting the appropriate points on the replacement circuit to the appropriate circuit breaks to complete the conversion.

Abstract: In a secondary tuning circuit, a capacitor is provided between a connection point between a direct-current blocking capacitor and a tuning coil and a connection point between a varactor diode and another direct-current blocking capacitor. The capacitor, another tuning coil and the varactor diode form a trap circuit. As a result, it is possible to prevent a frequency selection characteristic of the multiple-tuning circuit from deteriorating due to an undesired new tuning circuit formed by a static capacitance generated in a non-conductive state of the switch diode.

Abstract: A double conversion-type electronic tuner includes a first IF signal amplifying circuit having a field-effect transistor that amplifies an intermediate frequency signal at a predetermined gain, and input the resultant signal to a down-converter via a band-pass filter. The electronic tuner further includes a temperature compensating section formed by a serial circuit composed of an NTC-thermistor provided between the first IF signal amplifying circuit and a coupling capacitor of the band-pass filter. In this structure, when the temperature is changed, the degree of coupling between the circuits is varied to compensate for a variation of the gain caused by a change in temperature. Moreover, the characteristic of a capacitor forming a parallel resonant circuit in the band-pass filter is also varied by a change in temperature, and the matching loss is reduced.

Abstract: A double-tuned circuit of a tuner that can be switched for tuning to a plurality of frequency bands by turning a switching diode ON or OFF restrains degradation of a selectivity caused by an undesirable additional tuning circuit or parasitic tuning circuit formed by a capacitance generated when the switching diode is OFF and inter-terminal capacitance of a resistor. A double-tuned circuit of a tuner is also provided that exhibits good selectivity with reduced damping to a tuning circuit in a low-band receiving mode, and also exhibits a wider tuning range. A feed resistor for high-band receiving is directly connected to a switching diode in a primary tuning circuit, and the feed resistor for high-band receiving is connected to a switching diode via a coil in a secondary tuning circuit.

Abstract: A tuning circuit enables its Q to be always maintained with the condition of high grade even when tuning frequency of the tuning circuit is changed. The tuning circuit is constituted in such a way that a negative resistance circuit is connected to the tuning circuit in series. Series resistance component of an inductor of the tuning circuit is divided into a fixed resistance component r0 having nothing to do with a frequency and a variable resistance component r1 which is changed depending on a frequency. Load resistances r0′, and r1′ of the negative resistance circuit are made to correspond to the fixed resistance component r0 and the variable resistance component r1 respectively. When changing the tuning frequency, operation is made to control in such a way that the load resistance r1′ of the negative resistance circuit which corresponds to the variable resistance component r1 is changed while corresponding to change of actual resistance value of the tuning circuit.

Abstract: A low-priced digital broadcast receiving tuner suitable for miniaturization will be provided. According to the present invention, it is possible to provide a low-priced digital broadcast receiving tuner having higher productivity as well as a less number of components than a conventional tuner because, on one surface of an insulating board, there is formed a first tuner while, on the other surface thereof, there is formed a second tuner, and therefore a single insulating board can be shared.

Abstract: A tuning circuit enables its Q to be always maintained with the condition of high grade even when tuning frequency of the tuning circuit is changed. The tuning circuit is constituted in such a way that a negative resistance circuit is connected to the tuning circuit in series. Series resistance component of an inductor of the tuning circuit is divided into a fixed resistance component r0 having nothing to do with a frequency and a variable resistance component r1 which is changed depending on a frequency. Load resistances r0′, and r1′ of the negative resistance circuit are made to correspond to the fixed resistance component r0 and the variable resistance component r1 respectively. When changing the tuning frequency, operation is made to control in such a way that the load resistance r1′ of the negative resistance circuit which corresponds to the variable resistance component r1 is changed while corresponding to change of actual resistance value of the tuning circuit.

Abstract: A receiver for receiving both first-type reception signals, for example TV signals, and second-type reception signals, for example, FM-radio signals. The receiver may be used in multimedia applications. In the receiver, a reception signal is fed via an input section RFI-L, RFA-L, BPF-L to a mixer MIX-L. To obtain a relatively good performance, a band-pass filter BPF-L in the input section can be tuned through a frequency band, in which reception signals of both the first and the second type are present. The filter characteristics of the band-pass filter BPF-L are switched in accordance with the type of reception signal desired. For example, switching provides a passband which is substantially narrower for FM reception than for TV reception.

Abstract: The relationship between the input and output of a signal transfer circuit, such as a tune circuit, a filter, a phase shifter, an amplifier, etc., is determined by the circuit response to the input signal. The value of the circuit response (R) is controlled by the value (V) of a control signal supplied thereto. According to the invention, the relationship between the latter values is approximated by a linear regression function based on a number of measured first pairs of response/control signal values and based on such regression function a transcoder determines control signal values for providing response values of the circuit in accordance with second pairs of response/control signal values.

Abstract: A circuit configuration, especially in a television set, for range switching in tuners having at least two ranges includes at least two preselector stages each being assigned a respective tuner range. Each of the preselector stages is connected between a supply potential terminal and a reference potential terminal. Each of the preselector stages has an input terminal, an output terminal and an MOS tetrode. A switchgear for activating each of the MOS tetrodes has a switch output terminal being connected to the preselector stages and being connectable to the reference potential terminal. The preselector stages are coupled to one another for activating one of the preselector stages as a function of a switch state of the switch output terminal.

Abstract: A circuit configuration for range switching in tuners having at least two ranges includes at least two preselector stages each being assigned to a respective tuner range. Each of the preselector stages is connected between a supply potential terminal and a reference potential terminal. Each of the preselector stages has an input terminal, an output terminal and an MOS tetrode with a source terminal. A switchgear has switch outputs to be connected to the reference potential terminal for activating each of the MOS tetrodes. At least one resistor is connected between the source terminal of at least one of the MOS tetrodes and at least one of the switch outputs.

Abstract: A band switching circuit for a tuner for receiving VHF and UHF channels comprises a tuning circuit including a switching diode having an anode and a cathode for band switching, a plurality of resistors connected to the anode and cathode of the switching diode to thereby form a series-connected circuit, and a second diode connected in the series-connected circuit in a direction opposite to that of the switching diode. The switching diode can be forward-biased or reverse-biased for receiving the VHF channels, and can be disconnected from a DC power supply for receiving the UHF channels.

Abstract: An input circuit comprises at least two input paths which are connected to a common input terminal and which are alternately connectable to a common output. The input paths form selection members for the UHF and VHF frequency range whose signals are amplified in a common preamplifier component. In order to avoid mutual influencing of the selection members with simple measures, the output of the VHF selection member is connected to the common output via an impedance of the UHF selection member and a switch is provided for connecting the impedance and the output of the VHF selection member to ground for high frequency. The switch is conductive during UHF operation and then short circuits the output of the connected VHF input path.

Abstract: An electronic tuner capable of selectively receiving the UHF band and high and low channels in the VHF band is described which has a suitable resistance provided across power supply terminals in order to improve the separation between the VHF mode and the UHF mode.

Abstract: A VHF television tuner circuit is adapted for selecting a channel from a plurality of VHF television channels and a UHF/VHF converted television channel, by mechanical selection to form a resonant circuit having electrical characteristics corresponding to the selected channel. The tuner circuit is coupled to a VHF television signal terminal and a UHF/VHF converted television signal terminal. The tuner circuit comprises a channel selection means including a first switch and a second switch each comprising movable contacts fixedly positioned on a channel selection shaft and stationary contacts corresponding to the selectable channel positions and positioned in proximity to the movable contacts for coaction therewith. The first switch comprises a movable/stationary contact combination positioned in the vicinity of the VHF television signal terminal and responsive to selection of the UHF/VHF converted channel position for being grounded for electrostatically shielding the VHF television signal terminal.

Abstract: A combination VHF and UHF tuner is provided in which a common station selector shaft may be rotated a number of revolutions to cover the seventy stations in the UHF band. The common selector shaft is provided with twenty-four detent positions per revolution and in alternate positions of the shaft the twelve VHF stations in the VHF band are received. As the common selector shaft is rotated through several revolutions the VHF stations are repeatedly received but are interspersed with different individual stations in the UHF band. Accordingly, no matter what UHF station is being received, all of the VHF stations are always within one turn of the common selector shaft. In many mixed UHF-VHF reception areas a single turn of the common selector shaft is sufficient to select all of the UHF stations as well as all of the VHF stations which are broadcasting in that area.

Abstract: A tuning device comprises a preset mechanism capable of producing a tuning voltage to be applied to an electronic tuning circuit by moving any push button.

Abstract: In a VHF tuner a stator bar switching arrangement is provided which is particularly suitable for use in combination VHF-UHF tuners. A movable switching member positioned on the main stator bar of a turret type VHF tuner is moved between fixed contacts on the stator bar by engagement with a projection on each of the tuning sticks of the turret in each VHF channel receiving position of the main selector shaft. Various switching arrangements are provided for VHF-UHF operation.

Abstract: A combination VHF, UHF and superband tuner, the superband and UHF tuners cooperating with the Channel 1 section of the VHF tuner, is provided with a connection network including voltage sensitive switching devices, such as voltage sensitive diodes, so that selectively energizing a particular desired tuner by applying a supply voltage thereto will automatically effect the appropriate interconnections between the tuning units to render the selected tuner operatively effective and the non-selected tuners non-interfering therewith.