Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7800436 | Signal extraction circuit A shunt regulator performs a control so as to stabilize a voltage obtained by rectifying the radio frequency signal output from an antenna unit at a prescribed voltage value. A signal extraction unit extracts the information signal from a bypass current sent by the ... | 09/21/2010 |
| 7184487 | Receiver with chopper stabilization and method thereof A receiver (202) has a down-conversion receiver (304) for transforming a signal (201) from a first operating frequency to a second operating frequency that is lower than the first operating frequency, and a receiver filter (308) with chop... | 02/27/2007 |
| 7075590 | Apparatus for providing television receiver alignment functions A method and apparatus within a television receiver for electronically aligning signals within the receiver by controlling support circuitry for an IF module. A control voltage source controls both video alignment and picture IF (PIF) mute functions. The DAC is coup... | 07/11/2006 |
| 6944241 | Apparatus and method of eliminating vestigial sideband pilot tone in vestigial sideband/quadrature amplitude modulation system An apparatus and method for eliminating a vestigial sideband (VSB) pilot tone in a vestigial sideband/quadrature amplitude modulation (VSB/QAM) receiving system, is provided. This apparatus eliminates a vestigial sideband (VSB) pilot tone in a vestigial sideband/qua... | 09/13/2005 |
| 6933777 | AM detecting apparatus with overmodulation detecting function An AM detecting apparatus includes a voltage comparator And an AND circuit. The voltage comparator compares a detection signal a low-pass filter outputs with a no-signal potential. The AND circuit outputs, when the amplitude of an AM signal is higher than the refere... | 08/23/2005 |
| 6897719 | Demodulation circuit and demodulation method Two capacitors are provided for demodulating an amplitude-modulated signal and can be supplied with a signal that is rectified by a diode and that is at a voltage. The half-cycles of this signal are used for alternately charging the first or second capacitor using a... | 05/24/2005 |
| 6433631 | RF slipring receiver for a computerized tomography system A computerized tomography (CT) system having an apparatus and method for receiving high data rate communication is disclosed herein. The apparatus includes a controlled variable attenuator for attenuating an encoded digital data signal having a wide range... | 08/13/2002 |
| 6255901 | Demodulator for ask-modulated signals having small modulation depth A demodulator circuit for demodulating a signal ASK-modulated with modulation pulses equal in duration, and having a small depth of modulation and large dynamic range comprises an amplitude limiter (10) through which an amplitude-dependent current flows w... | 07/03/2001 |
| 6240283 | Apparatus and method for feedback mitigation in a low speed communications receiver A method and apparatus is shown for controlling the input gain of a receiver wherein the input gain is controlled by sampling an amplified data signal during a time interval when a positive-going feedback transient from an output terminal of the receiver ... | 05/29/2001 |
| 6169585 | Circuit arrangement for demodulating an intermediate-frequency video signal In a circuit arrangement for demodulating an intermediate-frequency video signal generated while using a Nyquist edge, having a phase-locked loop (1) including a phase detector (3), a loop filter (4) and a voltage-controlled oscillator (5), and a video de... | 01/02/2001 |
| 5699011 | DC offset compensation method and apparatus A DC offset measurement and compensation circuit includes a switch arrangement for establishing a zero carrier condition in the circuit. The circuit output is integrated to develop any DC offsets, which are converted to analog form and subtracted from the... | 12/16/1997 |
| 5539779 | Automatic offset control circuit for digital receiver An automatic offset control circuit comprises a differential output preamplifier having an offset adjustment function, further comprising an average detector, a peak detector, and a differential input amplifier. The average detector generates a reference ... | 07/23/1996 |
| 5450444 | Digital AM transmitter A digital AM transmitter according to the invention converts a audio signal to a digital audio signal of a plurality of bits by an A/D converter, outputs a logical code signal of "1" from each of those output terminals of a code unit, whose number corresp... | 09/12/1995 |
| 5412692 | Data slicer A data slicer follows abrupt variations in level of the detection signal. The data slicer for converting a detection signal into a digital signal in a data transmission system includes a maximum value detecting section, a minimum value detecting section, ... | 05/02/1995 |
| 5341106 | Amplitude locked loop circuits There is described an electronic circuit which operates an Amplitude Locked Loop. The circuit comprises a voltage controlled amplifier, a modulus detector and an integrator combined in a feedback loop. An FM signal decoder is also described as are a numbe... | 08/23/1994 |
| 5323425 | Direct conversion receiver for digital signals and method for demodulation of said signals In a digital mobile system, to avoid distortions and fadings due to multiple propagation and the doppler shift, adaptive gain of the amplifier of a demodulator must be controlled with information derived from the signal at a high frequency. This is accomp... | 06/21/1994 |
| 5267272 | Receiver automatic gain control (AGC) The invention is an automatic gain control (AGC) sampling structure in which a conventional closed loop AGC circuit detects a received level and generates a direct current voltage for controlling an amplification stage. This direct current voltage is samp... | 11/30/1993 |
| 5097487 | Local oscillator signal generating system for digital demodulator A digital demodulator or receiver (22) having an interface (24) for receiving an input signal modulated with digital data, a multiplier (36) for multiplying the input signal with a local oscillator signal (LO) to generate a product signal, and an integrat... | 03/17/1992 |
| 4972163 | Regenerating device having a phase-locked loop with loop gain compensation and offset compensation A regenerating device for regenerating a signal from a composite input signal, provided with a phase-locked loop comprising a first phase comparison circuit 1, a first low-pass filter 2 connected to the output thereof and a controlled oscillator 3. The co... | 11/20/1990 |
| 4641341 | Automatic multi-system AM stereo receiver using existing single-system AM stereo decoder IC Disclosed is an AM stereo receiver capable of receiving signals representing at least two different types of AM stereo systems, but using an integrated circuit (IC) decoder designed to properly decode received signals representing only one of the two type... | 02/03/1987 |
| 4633518 | AGC voltage generator with automatic rate switching An AGC voltage generating circuit for an AM radio comprises a product detector adapted to receive an IF signal modulated by an AF signal and synchronously detect the AF signal, a low pass filter adapted to derive from the product detector a filtered volta... | 12/30/1986 |
| 4536885 | Distortion correcting AM stereo receiver with non-flat AGC In a receiver for composite amplitude and angle modulated signals and having a non-flat automatic gain control characteristic, there is provided apparatus for providing distortion correction to the quadrature component produced by the angular modulation i... | 08/20/1985 |
| 4471311 | Detector circuit having AGC function An AM detector circuit capable of performing an AGC function having a wide dynamic range and low level of distortion and spurious interference. A first differential amplifier receives an amplitude-modulated signal to be detected as differential inputs. Ou... | 09/11/1984 |
| 4018994 | Compatible AM stereophonic receivers Compatible AM stereophonic receivers for reception of a radiant energy carrier wave modulated with two stereo related signals (L and R), each appearing as a respective first order single-sideband. Receivers embodying the invention in general improve an op... | 04/19/1977 |
| 3936750 | AM-FM receiver having improved bias supply circuit The present invention relates to an AM-FM receiver of the superheterodyne variety having a novel bias supply circuit wherein a common filter capacitor may be used for the bias supply, the AGC function in AM operation, and the AFC function in FM operation.... | 02/03/1976 |
