Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7193486 | Tunable, maximum power output, frequency harmonic comb generator A comb frequency generator that is tunable to vary the width of the pulses in the output signal and achieve a maximum power output at different harmonic frequencies. A wavefront compression device receives a sinusoidal input signal and provides wavefront compression... | 03/20/2007 |
| 7154976 | Frequency controller The invention may relate to a digital frequency adjuster for adjusting a first frequency of a first signal. The digital frequency adjuster may comprise a first digital delay line and a first control circuit. The first digital delay line may comprise a plurality of t... | 12/26/2006 |
| 7116709 | Communication method of contactless ID card and integrated circuit used in communication method The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each other, and “1” and “0” are allocated to the combined waveform. In ... | 10/03/2006 |
| 7079598 | Complex phase-locked loop demodulator for low-IF and zero-IF radio receivers A digital demodulator which coherently demodulates a low-IF or zero-IF complex signal using a complex-valued phase-locked loop (CPPL). The CPPL includes a numerical controlled oscillator, four multipliers and two combiners to provide independent phase/frequency and ... | 07/18/2006 |
| 7006806 | System and method for SAP FM demodulation Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator... | 02/28/2006 |
| 7003028 | Mixed signal adaptive boost equalization apparatus and method The high frequency components of a SCSI signal are adaptively equalized using an adaptive filter having an adjustable gain. A comparator is used to compare an input signal with a predetermined threshold level. Based on the result of the comparison, the adjustable ga... | 02/21/2006 |
| 6963735 | Method and arrangement for receiving a frequency modulated signal A method and arrangement for receiving a frequency modulated signal, includes mixing the frequency modulated signal into a low-frequency signal, detecting the falling and rising edges of said low-frequency signal and forming a second signal on the basis of the edge ... | 11/08/2005 |
| 6950640 | FM detector circuit An FM detector circuit includes a bridge circuit having four sections with a discriminator connected as one of the four sections. An FM intermediate frequency is applied across one pair of diagonally opposed nodes of the bridge circuit and an output is picked up acr... | 09/27/2005 |
| 6914946 | Digitally-implemented demodulator A digitally implemented demodulator. A frequency-modulated signal is applied to a limiting amplifier such that the signal amplitude is fixed at a constant level. The signal is undersampled and quadrature demodulated. The demodulator generates the cross-product of th... | 07/05/2005 |
| 6822692 | Digital filter Digital filter for filtering a digital input signal with a variable filter length (l), it being possible to switch over the filter length (l) of the digital filter (8) as a function of a variable input clock frequency (fin) of the digital input sig... | 11/23/2004 |
| 6766148 | Switched sideband frequency low-IF transmitter A transmitter for transmitting a high frequency transmit signal generates a low intermediate frequency quadrature signal, and up-converts the low intermediate frequency quadrature signal to the high frequency transmit signal. The frequency spectrum of the high frequ... | 07/20/2004 |
| 6621879 | Digital radio system, a digital radio device, and a quadrature demodulator A digital radio device having a quadrature demodulator that does not suffer from substantial amplitude roll-off at the relevant operating range. Such a device is obtained by a phase shifting network in a quadrature branch of the demodulator having a serie... | 09/16/2003 |
| 6586922 | Phase shift circuit and FM detector circuit Transistors (12a, 12b) turn on and off with mutually opposite phase input signals. Capacitors (16a, 16b) discharge when the transistors (12a, 12b) turn on, and capacitors (16a, 16b) are charged by constant current from constant current sources (18a, 18b) ... | 07/01/2003 |
| 6573782 | Sigma delta FM ratio detector A circuit (100) for generating a ratio signal indicating a ratio of frequency error to signal magnitude of an input signal includes an FM ratio detector (110) and a sigma-delta analog-to-digital converter (130). The FM ratio detector (110) is responsive t... | 06/03/2003 |
| 6545634 | Method for detecting and correcting non-linearities in radio-frequency, voltage controlled oscillators A method for detecting and correcting non-linearities in radio-frequency, voltage controlled oscillators provides for digitization of the frequency signal by feeding the undelayed frequency signal and a delayed frequency signal generated therefrom into EX... | 04/08/2003 |
| 6396338 | Variable delay line detector A variable delay line detector (34, 48, 66)includes a power splitter (36, 50, 68), a mixer (44, 62, 72) and a variable delay line (42,52, 70). Various devices are suitable for the variable delay line (42, 52, 70), such as a non-linear transmission line (N... | 05/28/2002 |
| 6335659 | Demodulator circuits A frequency modulated signal demodulator circuit includes a phase shift element and a time delay element which operate on an input signal (V_IF). The phase shift element and the time delay element are provided by a gyrator component (14, 16, 20).... | 01/01/2002 |
| 6229386 | Digital FM demodulation circuit A digital FM demodulation circuit which samples an input analog FM signal and digitally detects the sampled input signal has an arctangent circuit into which a second signal that is delayed from the sampled input signal by a constant time, and a third sig... | 05/08/2001 |
| 6137353 | Linearized integrated FM demodulator using a plurality of cascaded all-pass filters or a bessel filter An approach for demodulating a frequency-modulated signal involves processing a frequency-modulated signal with a phase shifter network to provide a demodulated signal that has a relatively constant amplitude around the center frequency of the frequency-m... | 10/24/2000 |
| 6084923 | System, apparatus and method for averaging digitized phase samples The present invention is directed to a system, apparatus and method for averaging digitized phase values. In particular, the polar coordinates represented by the digitized phase values are converted to rectangular coordinates via trigonometric identities.... | 07/04/2000 |
| 6081155 | Digital quadrature discriminator for demodulation of frequency-modulated information A circuit is designed with a delay circuit (102) coupled to receive a frequency-modulated data signal (100) at a delay input terminal. The delay circuit produces the data signal (103) after a predetermined delay at a delay output terminal. An exclusive OR... | 06/27/2000 |
| 6046630 | π/4 QPSK digital demodulating apparatus and a method thereof In a digital demodulation apparatus of a QPSK receiver which demodulates an input signal being modulated in the QPSK method by separating into an I (In Phase) channel signal and a Q (Quadrature) channel signal by a local carrier which is synchronized with... | 04/04/2000 |
| 6020784 | FM demodulation circuit An FM demodulation circuit includes a phase conversion circuit which converts a frequency variation of an input signal into a phase variation and has a variable conversion characteristic, and a control current source circuit which outputs, when the level ... | 02/01/2000 |
| 5990733 | Delay line ramp demodulator An integrated circuit includes a demodulator having delay circuitry and demodulation control circuitry that may be fully formed within a common integrated circuit. The delay circuitry receives an input signal and generates a delayed input signal. The demo... | 11/23/1999 |
| 5942937 | Signal detection circuit using a plurality of delay stages with edge detection logic A signal detection circuit employs a delay line with edge detection logic for capturing and buffering timing information about an input signal. A plurality of comparators for comparing the input signal to different reference potentials capture amplitude i... | 08/24/1999 |
| 5850161 | Digital FM demodulator using pulse generators A frequency modulation (FM) signal demodulating circuit having a simple structure using general digital devices is provided. The FM signal demodulating circuit according to the present invention includes a first pulse generator for generating a pulse sign... | 12/15/1998 |
| 5826181 | Radio frequency noise reduction arrangement A frequency selective noise reduction circuit and finds application in receiver demodulator arrangements in mobile telecommunication base stations. A receive signal is divided into two paths. One path includes a Phase Lock Loop circuit (PLL) which is empl... | 10/20/1998 |
| 5808510 | Demodulator for the demodulation of a frequency-modulated signal Radio receivers for frequency-modulated signals and more particularly, in such receivers, to a device for the demodulation of a signal modulated at intermediate frequency fi. The signal FM that is frequency modulated around a frequen... | 09/15/1998 |
| 5751188 | FM demodulator using a switched capacitor phase shifter In order to process an input signal exhibiting a frequency modulation about an intermediate frequency, the demodulator includes a first mixer for producing a first signal exhibiting the frequency modulation about a transposition frequency lower than the i... | 05/12/1998 |
| 5703527 | Frequency modulated signal demodulator circuit and communication terminal equipment A frequency modulated signal demodulator circuit wherein an in-phase component (I) and an orthogonal component (Q) of a frequency modulated signal output from an orthogonal detector circuit are respectively delayed by one sampling time. The result (I.mult... | 12/30/1997 |
| 5697086 | Co-channel FM signal/interference canceller A combination of two phase-lock loops, and a cancellation circuit are used to remove a dominant FM signal from within a signal environment. The two phase-lock loops together produce a replica of the highest power (i.e. dominant) FM signal. The cancellatio... | 12/09/1997 |
| 5694080 | Delay-type FM demodulation circuit A delay-type FM demodulation circuit of this invention has an object to satisfactorily remove a harmonic wave in an arithmetic calculation output signal even if an LPF having relatively moderate stopping characteristics is used. The delay-type FM demodula... | 12/02/1997 |
| 5448202 | Sigma-delta FM demodulator Digital frequency demodulation is accomplished by monitoring similar transitions in an FM radio signal to determine frequency. Time intervals between similar transitions in the FM signal are established by selecting anticipated transition times and accumu... | 09/05/1995 |
| 5440269 | Digital FM demodulator having an address circuit for a lookup table In a digital frequency demodulator, data representing the input signal to be demodulated is prestored in a look-up table and signal processing is digitally performed to generate a read address required for reading out the data stored in the look-up table ... | 08/08/1995 |
| 5418489 | Method of recovering a frequency modulated signal An apparatus and method is provided of recovering a frequency modulated signal having a first component of the frequency modulated signal at a zero-RF spectral location and a second component of the frequency modulated signal at a zero-RF spectral locatio... | 05/23/1995 |
| 5416803 | Process for digital transmission and direct conversion receiver The transmitter uses a synthesized oscillator (1A) whose reference (24) is provided by the clock (H) of the data (P, Q). The demodulation oscillator (13A) of the receiver is a synthesizer which is functionally identical to that (1A) of the transmitter, an... | 05/16/1995 |
| 5345188 | Sigma-delta digital FM demodulator Digital frequency demodulation is accomplished by monitoring similar transitions in an FM radio signal to determine frequency. Time intervals between similar transitions in the FM signal are established by selecting anticipated transition times and accumu... | 09/06/1994 |
| 5341107 | FM quadrature demodulator with two phase comparison circuits FM quadrature demodulator having in-phase and quadrature terminals for applying a pair of FM-modulated signals in a mutual phase quadrature thereto, having a modulation signal which is frequency-modulated on a carrier, one of the two terminals being coupl... | 08/23/1994 |
| 5302910 | FM detector circuit with error voltage applied to phase shifting circuit In an FM detector circuit, a phase-shifting circuit is constituted by integrating circuits each consisting of a transconductance amplifier and capacitor. The phase-shifting circuit being arranged to cause limiter signal to be phase-shifted by 90 degrees a... | 04/12/1994 |
