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| Number | Title | Issue Date |
| 7865157 | Controllable mixer A heterodyne receiver has a mixer with at least one transistor whose operating point can be varied dynamically. The quality of the output signal from the mixer is assessed in order to control the operating point. The operating point is set such that the collector cu... | 01/04/2011 |
| 7400868 | Automatic tuning apparatus for filter and communication instrument An automatic tuning apparatus for a filter includes a mode wherein a switching part is controlled so that a reference signal is inputted to the filter, a plural number of control signals are successively input to a control terminal of the filter, a tentative value o... | 07/15/2008 |
| 7369827 | System and method for communicating stored power measurement parameters between devices in a communications system During tuner manufacture, the unique power parameters as a function of frequency and channel are stored on a memory unique to each tuner. When the tuner is subsequently incorporated into another device, such as a modem, the stored power parameters are made available... | 05/06/2008 |
| 7292831 | Radio communicate method and system A transmitter 1 transmits from a transmission antenna 7 a mixture signal containing a radio-frequency (RF)-band modulated signal, and a portion of power of a local oscillation signal used for frequency conversion. Meanwhile, a receiver 8 detects... | 11/06/2007 |
| 7286804 | Receiver digital-analog converter and tuning circuit An object of the present invention is to provide a receiver, a digital-analog converter and a tuning circuit in which temperature compensating components can be formed on a semiconductor substrate while reducing component costs. An FM receiver 100 is constitu... | 10/23/2007 |
| 7183880 | Discrete inductor bank and LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 02/27/2007 |
| 7174147 | Bandpass filter with tunable resonator A tunable bandpass filter is provided that comprises a first shunt-connected ferroelectric (FE) tunable tank circuit having a first node to accept an input signal. A second shunt-connected FE tunable tank circuit has a second node to supply a bandpass filtered signa... | 02/06/2007 |
| 7120407 | Receiver and its tracking adjusting method A receiver such that the period required for tracking adjustment, temperature compensation is not needed, and tracking errors due to fluctuation of the power supply voltage are prevented from increasing, and a tracking adjusting method for the receiver. A DAC 4 | 10/10/2006 |
| 7116954 | Tunable bandpass filter and method thereof The present invention provides a tunable bandpass filter and method thereof. In a preferred embodiment, the tunable bandpass filter uses variable ferro-electric capacitors to adjust both the passband and the notch across the normal operating range of a wireless comm... | 10/03/2006 |
| 7065331 | Resonator configuration A resonator system and method are provided which includes/uses a tunable reference resonator, parts for tuning the reference resonator to a reference value via a controlled variable for the reference resonator, a tunable circuit resonator, and parts for tuning the c... | 06/20/2006 |
| 6864925 | Television tuner having less distortion A television tuner includes an input tuning circuit and an interstage tuning circuit. Each of the tuning circuits comprises a band-switching tuning circuit having a tuning inductor and a switching diode for switching an inductance of the inductor. A power supply vol... | 03/08/2005 |
| 6640093 | Broadcast receiver A receiver for broadcast signals, e.g. DAB, FM, DVB, and digital or analog short-wave RF broadcast signals according to the present invention includes a polyfunctional circuit (5) that can be switched into three modes and performs the digital frequency de... | 10/28/2003 |
| 6424824 | Apparatus for setting the tuning voltage of tunable resonant circuits A setting apparatus for setting the tuning voltage of a tunable resonant circuit has an amplification device which amplifies an oscillator tuning voltage, output by a phase locked loop, nonlinearly to produce the tuning voltage. The gain of the amplificat... | 07/23/2002 |
| 6058296 | Clutch knob for a clutch mechanism for a radio receiver with tuning device A clutch knob that comprises a body portion and a cover portion. The clutch mechanism includes two integrally formed flexible and resilient sweeper arms attached to the base of the body portion; serrations with alternating smooth troughs and crests which ... | 05/02/2000 |
| 5905948 | High frequency channel selecting circuit for radio receiver and method of manufacturing tuning circuits therefor A therefor method of manufacturing tuning circuits for constituting a high frequency channel selecting circuit for a radio receiver. The method can eliminate the complicated coil inductance adjustment for tracking on the circuit board, so that the circuit... | 05/18/1999 |
| 5797087 | Method and apparatus for performing a preset listening operation for a radio broadcast A method for performing a preset listening operation for a radio broadcast using a microcomputer including a first tuner, a second tuner, a random access memory and a timer. The microcomputer stores data regarding a preset channel, a preset listening star... | 08/18/1998 |
| 5524288 | Tuning of a radio receiver The present invention relates to a method of tuning a radio receiver to a desired frequency. The frequency of each tuning circuit in the radio receiver is controlled by controlling the capacitance diodes of the tuning circuits. The control is accomplished... | 06/04/1996 |
| 5280639 | Double super-heterodyne tuner A double super-heterodyne tuner provided with an up-converting section and a down-converting section, and including an input filter constituted by single tuning to be supplied with an input signal, an RF amplifier for amplifying the signal passing through... | 01/18/1994 |
| 5193213 | FM broadcast band subcarrier receiver An FM subcarrier receiver of the type useful for detection of a relatively high frequency subcarrier signal transmitted on an FM carrier which includes baseband and relatively high frequency signals is disclosed. It comprises radio frequency circuitry for... | 03/09/1993 |
| 4703292 | Tuning circuit apparatus In a tuning circuit apparatus comprising first and second tuning circuits having their tuning frequencies varied in a ganged fashion; a composite varactor device provides first and second Varicap diodes formed on a common semiconductor substrate, with ano... | 10/27/1987 |
| 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 for tuning the receiver's local oscillator to a selected ... | 06/07/1983 |
| 4191924 | Channel selection apparatus A channel selection apparatus comprises a counter, a decoder, a clock pulse generator, and a control circuit for controlling them, and selects a channel by switching a channel selection voltage by selecting a potentiometer. The counter includes a cascade-... | 03/04/1980 |
| 4186360 | Digital channel selecting apparatus A digital channel selecting apparatus for selecting a channel among a plurality of channels which are distributed in at least a relatively higher and lower frequency regions, wherein a plurality of capacitance elements are coupled in parallel, each consti... | 01/29/1980 |
| 3949303 | Time controlled switching arrangement for two timer radio receiver A radio receiver is provided having a selectively tunable tuner section and a second tuner section which may be preset to receive the signal transmitted from a single transmitting station. A single output amplifier (including intermediate frequency and au... | 04/06/1976 |
