Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 7421043 | Method and/or apparatus for stabilizing the frequency of digitally synthesized waveforms An apparatus comprising a first circuit, a second circuit, a third circuit and a fourth circuit. The first circuit may be configured to generate a demodulated signal in response to (i) a modulated signal and (ii) a seed value. The second circuit may be configured to... | 09/02/2008 |
| 7386286 | High frequency low noise phase-frequency detector and phase noise reduction method and apparatus The present invention discloses a new type of extremely low-noise phase-frequency detector (PFD) 500, broadband from DC to multi-GHz RF frequencies for PLL synthesizer applications. Free of any feedback mechanisms, thus inherently fast, it operates close to t... | 06/10/2008 |
| 7332978 | Glitch free controlled ring oscillator and associated methods A glitch free controlled ring oscillator may comprise a programmable delay chain connected to a gating and inverter stage or means. A latch or latching means may be provided between the delay chain and the gating and inverter stage or means for registering the clock... | 02/19/2008 |
| 7301377 | Demodulation apparatus and receiving apparatus A demodulation apparatus that can support various oscillation frequencies. The portable phone device includes a frequency synthesizer for generating a local-oscillation signal having a local oscillation frequency for converting the frequency of an input receiving si... | 11/27/2007 |
| 7274732 | Echo cancellation in communication systems with asymmetric data rates A communication device (e.g., a modem) is disclosed as including logic that processes a transmit signal before providing a signal to an echo canceler. The processing may include low pass filtering and decimation of the transmit signal. The low pass filter's cut-off ... | 09/25/2007 |
| 7263344 | Method for reducing IM2 noise in a down conversion circuit The present invention relates generally to communications, and more specifically to a method and apparatus for minimizing DC offset and second-order modulation products (IM2 noise) while demodulating RF signals. The principle of the invention can be applied to diffe... | 08/28/2007 |
| 7218850 | Apparatus and method for monitoring signal-to-noise ratio in optical transmission systems A high-sensitivity signal-to-noise ratio (SNR) determining apparatus measures the in-band SNR of an optical data signal by detecting and demodulating the optical signal and analyzing a narrow bandwidth of the resulting electrical data spectrum at half the data clock... | 05/15/2007 |
| 7184716 | Low cost/low power analog transceiver architecture A time division duplex (TDD) single sideband (SSB) transceiver includes a transmitter adapted to input an analog audio signal, sample the analog audio signal, and to output an SSB frequency shift keyed (FSK) signal corresponding to the analog audio signal, the SSB F... | 02/27/2007 |
| 7173982 | Method and circuit for digitally correcting the frequency of a signal A method and a circuit for the digital correction of a frequency of a signal, especially for use in a transmitter/receiver circuit include rotating a signal “pointer” (i0, q0) using a CORDIC algorithm, through a predetermined angle in a complex I/Q plane corresp... | 02/06/2007 |
| 7145967 | Signal frequency splitter and frequency shift key decoding apparatus using the same A frequency shift key decoding apparatus, having a frequency divider, a signal frequency splitter, and a demodulator. The signal frequency splitter has a frequency synthesizer, (n−1) first mixers, n second mixers, and n filters, where n is an integer equal to or l... | 12/05/2006 |
| 7138857 | Signal processing device for mobile radio A signal processing device includes a conversion device configured to output a differential current signal at two taps on the basis of an input signal and an oscillator signal. A respective controllable current source is coupled to one of the two taps. An amplificat... | 11/21/2006 |
| 7061276 | Digital phase detector A high performance phase detector includes a local digital oscillator for generating a digital reference signal of programmable frequency and phase. The phase detector accumulates a difference in phase between the digital reference signal and a sampled input signal ... | 06/13/2006 |
| 7049992 | Sample rate doubling using alternating ADCs One embodiment of the invention includes a system comprising an analog baseband signal input, a conversion circuit with N Analog to Digital Converters (ADCs) operable to receive the analog baseband signal, and a Finite Impulse Response (FIR) filter operable to recei... | 05/23/2006 |
| 7039372 | Method and system for frequency up-conversion with modulation embodiments A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ... | 05/02/2006 |
| 7020221 | System and method for an IF-sampling transceiver The present invention is directed toward a radio, and method for receiving radio frequency signals. The radio comprises an input signal at a first intermediate frequency, an intermediate sampling architecture, a quantizer and a baseband converter. The intermediate f... | 03/28/2006 |
| 6995595 | Direct conversion receiver having a DC offset eliminating function A direct conversion receiver having a DC offset eliminating function that eliminates a DC offset component in which an oscillator generates a local frequency signal, A first phase shifter shifts a phase of the local frequency signal from the oscillator by 90°, a fi... | 02/07/2006 |
| 6992510 | Multiplier circuit with offset compensation and quadricorrelator A multiplier circuit has an analog multiplier with two signal inputs. A respective switching device is connected to each one of the two signal inputs of the analog multiplier for periodically reversing the polarity of the input voltages. A clock signal that can be f... | 01/31/2006 |
| 6985029 | Circuit configuration for tolerance correction in a frequency demodulator A demodulator has a resistor and a capacitor that may be subject to tolerances. For tolerance correction, the FM demodulator is preferably supplied with a reference frequency, which corresponds to the nominal mid-frequency of the demodulator, which is a function of ... | 01/10/2006 |
| 6982592 | Zero if complex quadrature frequency discriminator and FM demodulator A frequency discriminators (FD) and frequency modulation (FM) demodulators, utilizing single sideband (SSB) complex conversion directly to zero IF, suitable for direct demodulation at high frequencies of analog FM or digital FSK modulated signals, as well as for hig... | 01/03/2006 |
| 6952239 | Sine generation circuit, phase shift circuit and tint adjustment circuit A phase shift circuit includes a first sine generation circuit generating a sine-converted output signal (sin θ) of the phase shift input signal (θ) and a reversed sine-converted output signal (−sin θ) of the phase shift input signal (θ), a cosine generation c... | 10/04/2005 |
| 6943847 | FM demodulator for SECAM decoder A SECAM decoder and an FM modulator therefor are disclosed, in which a demodulated color signal is provided to indicate deviations in the frequency of modulated color information from a nominal subcarrier frequency. The demodulator comprises numerator and denominato... | 09/13/2005 |
| 6904538 | System and method for differential data detection The present invention is directed towards a data detector for deriving a data signal from an incoming radio frequency input. The data detector comprises a delay logic which receives an unfiltered signal in quadrature and in-phase components, and applies a delay to e... | 06/07/2005 |
| 6847255 | Zero IF complex quadrature frequency discriminator and FM demodulator A frequency discriminators (FD) and frequency modulation (FM) demodulators, utilizing single sideband (SSB) complex conversion directly to zero IF, suitable for direct demodulation at high frequencies of analog FM or digital FSK modulated signals, as well as for hig... | 01/25/2005 |
| 6677816 | Circuit arrangement for demodulating signals In a circuit arrangement for demodulating signals, particularly frequency-modulated signals, in which a limiter, to whose input the signals to be modulated can be applied, is followed by a demodulator from whose output the demodulated signals can be deriv... | 01/13/2004 |
| 6459333 | Differentiate and divide FM demodulator An FM demodulator in accordance with the present invention receives a composite signal from an antenna and corresponding processing circuitry. The composite signal includes a carrier signal having a voice/data signal modulated thereon. The composite signa... | 10/01/2002 |
| 6353639 | Filter configuration and slope detector for quadrature amplitude modulated signals A filter configuration for a demodulated QAM signal has a first channel for a cosine demodulated component of the QAM signal, a second channel for a sine demodulated component of the QAM signal, a filter circuit, which receives the two signal components a... | 03/05/2002 |
| 6072848 | Method and apparatus for constructing a digital phase differentiator incorporating a dynamic decrement counter A method and apparatus for constructing a digital phase differentiator incorporating a dynamic decrement counter (30). A limited signal is sampled at a fixed sampling rate. A fixed rate for an intermediate frequency is obtained. The fixed sampling rate is... | 06/06/2000 |
| 5982821 | Frequency discriminator and method and receiver incorporating same Apparatus and method for digital frequency discrimination are provided that only require one sample per data symbol (e.g. one bit for BPSK or 2 bits for QPSK). This is accomplished by determining the difference between the carrier phase error on successiv... | 11/09/1999 |
| 5912929 | Method and apparatus for performing carrier detection A digital implementation for a carrier detector. The detector determines if the carrier frequency at any instant is within a predetermined frequency band. The detector further determines if the detected frequency remains within the predetermined frequency... | 06/15/1999 |
| 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 |
| 5734295 | Quadrature demodulator having active filters formed with emitter follower output stages The invention provides a quadrature demodulator which removes unnecessary higher harmonic signals included in a demodulation output without giving rise to increase in number of externally connected parts and increase in current consumption. The quadrature... | 03/31/1998 |
| 5630216 | Micropower RF transponder with superregenerative receiver and RF receiver with sampling mixer A micropower RF transdponder employs a novel adaptation of the superregenerative receiver wherein the quench oscillator is external to the regenerative transistor. The quench oscillator applies an exponentially decaying waveform rather than the usual sine... | 05/13/1997 |
| 5604808 | FM signal processor An FM signal phase-shifted by 90° and an FM signal not phase-shifted are supplied to a multiplier to demodulate a stereo composite signal. A 90° phase shifting circuit has a first oscillation circuit whose phase shift amount varies according to a timing... | 02/18/1997 |
| 5579338 | Spread spectrum receiver using partial correlations A complex baseband signal as long as one period of PN signal is divided into three sequences. The three partial signals are input to three correlators which then calculate the correlations between the three partial signals and three partial PN signals. Th... | 11/26/1996 |
| 5563537 | Frequency-controlled circuit A frequency-controlled circuit for automatically detecting a center frequency of a received signal whose frequency is shifted includes a frequency control unit for receiving the input signal and changing the frequency of the received signal into another f... | 10/08/1996 |
| 5469112 | Communication device with zero-crossing demodulator A communication device (100) includes mixers (104) and (108) which mix a local oscillator (112, 106) with a received signal to produce in-phase (i) and quadrature (q) components. The direction of the phase of the signal is detected as it crosses the i and... | 11/21/1995 |
| 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 |
| 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 |
| 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 |
| 5179360 | Transmitting/receiving apparatus switchable between digital and analog modulation modes Upon transmission, when the digital transmission mode is set, an analog audio signal is A/D converted, the digital audio signal is coded, a first carrier is modulated by the coded signal and multiplied by a first multiplier, and the multiplied signal is s... | 01/12/1993 |
