Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4392231 | Spread spectrum FH-MFSK decoder The present invention relates to a decoder for use in a spread spectrum radio receiver which is capable of directly demodulating an L-length frequency-hopped, Q-level frequency shift keyed radio-frequency received signal into a baseband signal wherein a d... | 07/05/1983 |
| 4388595 | Apparatus and method for removing bias distortion from a product demodulator A class of product demodulators operates by multiplying an input signal with a delayed version of itself. Bias distortion in such product demodulators arises when the signals to be multiplied together are not separated by the correct amount of delay. The ... | 06/14/1983 |
| 4377006 | IR Remote control system A remote control system for a television receiver includes a transmitter and a receiver, the transmitter being adapted for transmitting a multibit code identifying a selected function of the television receiver wherein the data bits forming the multibit c... | 03/15/1983 |
| 4368434 | Programmable digital detector for the demodulation of angle modulated electrical signals In modem circuitry in which an angle modulated carrier signal is clipped and demodulated, and the demodulated signal is filtered and compared with a threshold value to produce an output signal, the invention features, in one aspect, a delay line whose len... | 01/11/1983 |
| 4362997 | Quadriphase differential demodulator A method and apparatus for synchronizing a digital data demodulator to a received phase modulation carrier signal in which the carrier signal is phase shifted during each modulation period of the carrier to represent one of four pairs of binary bits or di... | 12/07/1982 |
| 4352194 | System and method for frequency discrimination A system for determining the frequency of any received tone segment of N possible time synchronous tone segments each having a period T1 and each having one of N predetermined frequencies. The system comprises a first shift register having M st... | 09/28/1982 |
| 4335446 | Terminal equipment for data-transmission network including digitally operating modem At a subscriber station AU communicating with a central office of a data network, a logic unit UM includes a processing subunit UE which, under the control of a microprogrammed subunit UC comprising a microinstruction memory MM and a sequencer SQ, digital... | 06/15/1982 |
| 4328587 | Phase slip detector and systems employing the detector A phase slip detector and systems employing said detector comprises a frequency detector for detecting an instantaneous value of received carrier frequency and an integrator for integrating the output of said detector, and determines an occurrence of phas... | 05/04/1982 |
| 4317210 | Coherent receiver for angle-modulated data signals A receiver for angle-modulated signals of the type a sin((ω)t+$c;(t)), comprising a frequency transposition stage (3) incorporating a local oscillator (3-1). A frequency shift Ɗω of the local oscillator relative to the carrier frequency ω may ... | 02/23/1982 |
| 4312072 | Radio frequency transmission system Radio transmission system in which the carrier frequency oscillator at the transmitter is wobbulated by varying its frequency in a periodic manner and modulated and transmitted to a receiving site where the detected signal is passed through two separate p... | 01/19/1982 |
| 4305150 | On-line channel quality monitor for a communication channel An on-line channel monitor, for measuring Eb /NO, measures the quality of a communication channel while the channel is in use. The channel monitor employs a soft-decision demodulator so as to compare analog signal levels of an AGC co... | 12/08/1981 |
| 4282490 | Pulse count type FM demodulator circuit Disclosed is a demodulator circuit which comprises a limiter circuit, a differentiation circuit, a monostable multivibrator circuit and an integration circuit. The differentiation circuit is composed of a delay circuit and a differential logic circuit. Th... | 08/04/1981 |
| 4234930 | Interleaved binary coded signal translation device Apparatus for improved translation of an interleaved binary coded signal heavily masked by noise comprising a plurality of delay line type matched binary code filters for receiving the interleaved signal, preferably of the surface acoustic wave type. Each... | 11/18/1980 |
| 4186347 | Radio frequency arraying method for receivers A method and apparatus for increasing the signal-to-noise ratio of a receiving facility for coherent frequency reception by arraying receiving systems using separate antennas for each, or one antenna for all systems. One system is operated with a carrier ... | 01/29/1980 |
| 4088957 | Method and apparatus for synchronously detecting a differentially encoded carrier signal A differentially encoded carrier signal is synchronously detected by generating an output signal indicative of the carrier signal characteristic in each transmitted bit interval during the interval, storing it so that in the next bit interval it can be co... | 05/09/1978 |
| 4086430 | Detection circuitry A detection circuitry designed to sense a composite signal of the type such as composite frequency shift keying (FSK) 50% amplitude modulated (AM) signal or pulse code modulated return to zero FSK type signal. The circuitry includes means for separating t... | 04/25/1978 |
| 4041406 | Method and apparatus for the determination of the transition of digital data signals modulated with two different signal frequencies A method and apparatus are provided for detecting the transition of digital data signals the two states of which are modulated with two different signal frequencies from one signal frequency to the other signal frequency. Timing elements generate comparis... | 08/09/1977 |
| 4034305 | Demodulator for signals hybrid modulated by more and less significant digit signals in succession in each clock interval A demodulator for demodulating a received quadrature amplitude modulated signal includes a generator for generating a local carrier signal, a synchronous detector responsive to the local carrier signal for deriving in phase and quadrature phase base bank ... | 07/05/1977 |
| 3980961 | Frequency demodulator for a FSK data transmission system Frequency demodulator for a frequency-shift-keying data transmission system, which demodulator comprises, in cascade, a monostable circuit, a lowpass filter and a voltage comparator to which a threshold voltage is applied. The demodulator further comprise... | 09/14/1976 |
| 3979685 | Frequency shift key demodulator A demodulator for detecting first and second frequencies in an analog input signal includes a limiter providing first pulses having a short duration in response to the first frequency and having a long duration in response to the second frequency. A first... | 09/07/1976 |
| 3976996 | Conversion of FSK to NRZ coding Circuit and method for converting FSK recorded data to NRZ by measuring time intervals between signals transitions of the same polarity.... | 08/24/1976 |
| 3970945 | Method and apparatus for demodulating PSK modulated oscillations A method and apparatus for demodulating an input signal modulated according to the phase shift keying (PSK) modulation method wherein the modulated input signal is combined with a reference voltage of the same frequency which is leading in phase by one-qu... | 07/20/1976 |
