Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7424265 | Rectifier circuit and radio communication device A rectifier circuit includes a bias circuit that outputs a direct-current voltage; a first MOS transistor that has a gate and a source; and a second MOS transistor that has a gate, a source, and a drain connected to the source of the first MOS transistor. Only the d... | 09/09/2008 |
| 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 |
| 7283796 | Electronic tuning system An electronic tuning system includes an electronic tuner for adjusting the predetermined control voltage of a voltage controlled oscillator (VCO) to tune the local frequency signal to radio waves on an arbitrary channel in accordance with channel selection informati... | 10/16/2007 |
| 7274918 | Apparatus for automatically finding an am radio program The invention relates to a method for automatically finding an AM radio program, by which an AM radio receiver is tuned through in discrete steps, such that, for each set AM frequency, the reception quality at the currently set AM frequency is determined, the field ... | 09/25/2007 |
| 7266388 | Transmitting circuit and communication terminal unit therewith When a signal of GSM 900 frequency band is transmitted, a bias voltage setting circuit sets an optimum bias voltage for the GSM 900 frequency band to a first stage amplifier and a second stage amplifier. The transmission signal is amplified by the two amplifiers. A ... | 09/04/2007 |
| 7236741 | Methods and apparatus for tuning in an inductive system Electronic circuitry supports utilization of a series of pulses of varying width to tune a transducer (e.g., a coil that produces or receives a magnetic field) for transmitting or receiving. For example, a control voltage generator generates a sequence of digital pu... | 06/26/2007 |
| 7167697 | Reverse electronic tuning circuit for FM radio frequency-lock-loop circuits An electronic circuit having reverse scan tuning comprises an IC radio having the forward scan function, in which a VCO capacitor is connected in parallel to a series connected resistor and switch, and a second switch is connects an input to an IF limiter amplifier ... | 01/23/2007 |
| 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 |
| 7110729 | Apparatus and method for generating a temperature insensitive reference current A constant current source for generating a constant reference current that is relatively temperature insensitive. The constant current source comprises: i) first circuitry for generating a first output current that increases with increases in temperature; ii) second... | 09/19/2006 |
| 6889036 | Integrated frequency selectable resonant coupling network and method thereof An integrated center frequency selectable resonant coupling network suited for use in an integrated circuit is disclosed. The network includes an integrated coupling transformer having a secondary winding for coupling to a load and a primary winding for coupling to ... | 05/03/2005 |
| 6628931 | Shortwave receiver and antenna adaptor A shortwave radio-receiver shows an improved reception sensitivity that can be used in a highly convenient way. The receiver is adapted for the superheterodyne system and the PLL synthesizer system and includes a front end circuit 33A for converting the r... | 09/30/2003 |
| 5425056 | Method and apparatus for generating threshold levels in a radio communication device for receiving four-level signals A symbol detector (110) for generating data symbols from a received signal having multiple signal voltages comprises an analog-to-digital converter (115) for converting the multiple signal voltages to digital values and peak and valley counters (310, 315)... | 06/13/1995 |
| 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 |
| 5136719 | Automatic antenna tubing method and apparatus A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control signal is applied to a variable tuning element in the match... | 08/04/1992 |
| 4941050 | An afc arrangement for tuning a television receiving apparatus to a select transmission having an actual carrier frequency which differs from a nominal carrrier frequency A television receiver has an a.f.c. arrangement for ensuring the correct tuning of a tuner unit (4) which is tuned to the nominal carrier frequency by a tuning voltage (VT). When the tuner unit (4) is incorrectly tuned to the actual carrier frequency, the... | 07/10/1990 |
| 4624014 | Signal-seeking tuning system with a seaching mode activated by the user's operation of a manual band switch An automatic signal-seeking television receiver has a pair of capacitors for developing tuning voltages for the VHF and UHF bands, respectively. A manual bandswitch arrangement for selecting the frequency band of the tuner, selects one of the capacitors f... | 11/18/1986 |
| 4509204 | AM Radio stop detector Disclosed is a stop detector circuit for issuing a stop signal in an electronically tuned AM radio when the radio is center tuned on a radio signal that exceeds a predetermined level of signal strength. An intermediate frequency signal and an automatic ga... | 04/02/1985 |
| 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 discriminator is provided together with a second binary-coded ... | 07/17/1984 |
| 4439787 | AFT Circuit An AFT circuit for a television receiver automatically adjusts the frequency of a tuner local oscillator, not only on the basis of an error signal provided from an AFT discriminator, but also on the basis of horizontal synchronizing pulses contained in th... | 03/27/1984 |
| 4419767 | Automatic digital control device for exact frequency tuning of a receiver In a voltage synthesizer type receiver in which the tuning frequency is varied in first and second directions and in which a tuning frequency is automatically obtained in response to detuning detection signals produced from a window comparator, a hysteres... | 12/06/1983 |
| 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 encoder to provide a first pulsed output to tuning circuit... | 10/04/1983 |
| 4406018 | Automatic FM tuner In an automatic FM tuner of a voltage synthesizer in which an output from a voltage control oscillator is varied in response to a tuning clock pulse to scan or search a broadcasting frequency wherein when a comparator having an input of the output voltage... | 09/20/1983 |
| 4361908 | Channel search and selection system for television receiver A channel search and selection system for a televison receiver, using a voltage synthesizer system, comprises a channel selection voltage generator for producing a continuously changing control voltage, an electronic tuner which receives this control volt... | 11/30/1982 |
| 4348770 | Manual channel selection apparatus A channel selection apparatus comprising a circuit for facilitating the manual channel selection in an electronic tuning radio receiver. It comprises a group of gate circuits (30, 32, 34 and 36) which temporarily interrupt the instruction for the manual c... | 09/07/1982 |
| 4344186 | Tuning circuit In a tuning circuit for a receiver which is continuously tunable over a number of wave ranges by means of a setting circuit, the receiver having an automatic wave range change-over, the tuning voltage is obtained from a subtracting circuit in which a chan... | 08/10/1982 |
| 4342007 | Swept frequency oscillator with compensation for variations in tuning sensitivity In a swept frequency oscillator arrangement compensation is provided for the non-linearities in the tuning sensitivity of the oscillator. The non-linearities are initially measured and stored. Subsequently the stored values are used to control the rate at... | 07/27/1982 |
| 4317225 | Channel identification apparatus useful in a sweep type tuning system In a tuning system for generating a tuning voltage for tuning a television receiver, channel identification apparatus includes a memory for storing binary signals representing boundary voltages having magnitudes corresponding to magnitudes of the tuning v... | 02/23/1982 |
| 4282602 | Channel signal detection circuit for scanning receivers An on channel signal detection system for use in scanning receivers to stop scanning at the desired frequency rather than for an undesired frequency. An amplifier receives IF signal and supplies them to a limiter composed of a pair of diodes. The output o... | 08/04/1981 |
| 4271434 | Channel selector A channel selector for a radio frequency receiver system including a phase locked loop frequency synthesizer for synthesizing a local oscillator frequency corresponding to a closely determined frequency to a transmitted signal of a desired receiving chann... | 06/02/1981 |
| 4240115 | Channel selection voltage generator A channel selection voltage generator comprises a tuning voltage generator circuit having a capacitor for supplying a tuning voltage to an electronic tuner, a first constant current source for constantly discharging the capacitor at a first constant curre... | 12/16/1980 |
| 4211988 | Search tuning system for television receiver A search tuning type channel detector system for television receivers. When AFC voltage of a tuner has attained a first predetermined voltage level, frequency sweeping direction for tuning is reversed and stopped thereby to tune the tuner at an optimum tu... | 07/08/1980 |
| 4207529 | Radio receiver An AM/FM receiver provided with a frequency divider for frequency dividing the output frequency of a local oscillator to provide a count output which starts with "1" at the lower limit of a receiving frequency band and thereafter increases its count value... | 06/10/1980 |
| 4156196 | Memory scanning radio receiver with separate channel data selection A radio receiver having RF, frequency converter, demodulator and audio stages, in which the frequency converter stage is connected to a local oscillator composed of a phase locked loop. The radio receiver includes a variable frequency divider inserted int... | 05/22/1979 |
| 4153914 | Network for applying a plurality of control voltages to a common control terminal A network for combining a switchable and variable tuning voltage with an AFC voltage so as to effect a change in the tuning control voltage at a tuner's tuning control terminal is disclosed. The network compensates for time delays associated with the AFC ... | 05/08/1979 |
| 4138653 | Solid state tuner control A television tuner arrangement is disclosed including a wide band signal selecting circuit having a solid state voltage variable capacitance selectively controllable in accordance with the level of applied voltage and a channel selector control for contro... | 02/06/1979 |
| 4107615 | Receiver including an automatic tuning correction suppression circuit coupled to the tuning member By using a double potentiometer one of which is used for tuning and the other for adjusting a level whose variation suppresses an automatic tuning correction, a great freedom can be obtained in designing the tuning section of a receiver with automatic tun... | 08/15/1978 |
| 4074200 | Circuit arrangement for selective frequency analysis of the amplitudes of one or more signals A circuit arrangement for the frequency selective analysis of the amplitudes of one or more signals in which a selective receiver is automatically scanned through a given frequency band and the scanning speed of its frequency settings is controlled as a f... | 02/14/1978 |
| 4074216 | Receiver tuning circuit A receiver tuning circuit in which without operation of extra switches a change-over can be made from tuning by means of a continuously varying tuning voltage to tuning by means of one of a number of adjusted tuning voltages by using a capacitor controlle... | 02/14/1978 |
| 4061981 | Voltage variable capacitor tuned radio receiver having delayed automatic frequency control at turn-on A voltage variable capacitor tuned radio receiver having a circuit which delays operation of a portion of the radio receiver circuit which includes the automatic frequency control circuit after the radio receiver is first energized until the filter capaci... | 12/06/1977 |
| 3987400 | Multiband scanning radio receiver There is disclosed a signal-seeking, scanning superheterodyne radio receiver operable on all four bands comprising the public service radio frequencies. The receiver uses a single oscillator and appropriately controlled frequency multipliers to generate t... | 10/19/1976 |
