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Thomas Edison ; 1889
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| Number | Title | Issue Date |
| 4479250 | Dual audio capture limiter squelch circuit A communications receiver squelch circuit for use in frequency modulation systems which has tight squelch sensitivity. The squelch circuit includes two audio limiters and provides improved squelch sensitivity and squelch action that is independent of carr... | 10/23/1984 |
| 4479251 | Noise blanker A noise blanker circuit protects a signal processing circuit from unwanted noise spikes by interrupting the signal path when it exceeds a preestablished threshold or reference level. The detector itself is a two branch detector that has in one branch a va... | 10/23/1984 |
| 4479252 | Device for reduction of the false alarm ratio and monitor receiver comprising such a device of this nature A monitor receiver incorporating a device for reducing the false alarm ratio comprises a frequency changer, a wobbulated oscillator, two band pass filters of which the central frequencies are constant and staggered, two logarithmic amplifiers and two ener... | 10/23/1984 |
| 4479253 | Phaselock receiver with input signal measuring capability In a communications receiver where the AGC signal derived from a phaselock detector is used to measure input signal strength, and that measurement is subject to error as a result of the nonlinear devices used in the carrier demodulation, a signal having i... | 10/23/1984 |
| 4479254 | Noise floor automatic gain control A noise floor automatic gain control system for radio receivers that receives a modulated signal and converts the modulated signal to a demodulated signal whose amplitude is controlled by a first gain control signal. The first gain control signal is the l... | 10/23/1984 |
| 4479255 | Apparatus for acquiring and collecting radio signals coming from a plurality of stations An apparatus for acquiring and collecting messages aboard a satellite which are transmitted via respective radio-signals over different frequencies from a plurality of beacons comprises a receiver having an adjustable gain control input. An automatic gain... | 10/23/1984 |
| 4479256 | Two pilot frequency control for communication systems Apparatus for synchronizing the frequency of locally generated pilot signals with those of remotely generated pilot signals where frequency errors are introduced during transmission. A pair of demodulated pilot signals F1' and F2' are filtered and mixed t... | 10/23/1984 |
| 4479257 | Superheterodyne circuit having variable bandwidth and center frequency shift function The invention relates to a superheterodyne circuit characterized by comprising a first mixer converting a received signal into the first intermediate frequency, a second mixer converting the first intermediate frequency into a second intermediate frequenc... | 10/23/1984 |
| 4479258 | Cross-polarization crosstalk canceller A cross-polarization crosstalk canceller is equipped to receive two polarized waves which are orthogonally crossing each other. The cross-polarization interference is eliminated by multiplying the signal received on one side by a compensating coefficient ... | 10/23/1984 |
| 4479259 | Transistor oscillator circuit Transistor oscillator circuit having a resonant-circuit or crystal-controlled oscillator realized by a feedback differential amplifier and provided for driving a mixture stage including a pair of transistors forming the oscillator and having a current-car... | 10/23/1984 |
| 4479260 | Coupling and mixing circuit comprising a dual source transistor A dual-source F.E.T. connected in a common gate arrangement for receiving respective input signals at the two-sources and for producing at a drain terminal the sum of the input signals. A circuit is disclosed which combines the dual-source F.E.T. with a s... | 10/23/1984 |
| 4479261 | Battery saving circuit for paging receiver A battery saving circuit for a battery powered receiver composed of a receiving section, a waveform shaping section and a control section, the waveform shaping section requiring a predetermined time after being connected to the power supply to become oper... | 10/23/1984 |
| 4479262 | Static audio-frequency control receiver Static audio-frequency control receiver for the time impulse interval process, consisting of a micro-computer, an electronic computing means and an evaluation component. In the micro-computer, a number of impulse scanning patterns are stored, and a progra... | 10/23/1984 |
| 4479263 | Device for acquiring and processing electrical signals In an exemplary embodiment, a device housing with a signal processing part, includes at least one recess into which at least one insert with a cladding of insulation material of high electric strength can be inserted as a signal transmission part, whereby... | 10/23/1984 |
| 4479264 | Transducer for optical data transmission A transducer for optical data transmission is disclosed in which an optical signal is encoded with information representative of a parameter being measured and transmitted to a remote measurement and control apparatus site for decoding. An input optical s... | 10/23/1984 |
| 4479265 | Laser microphone The invention is a laser microphone in which two aligned beams of laser light, of which one beam is slightly delayed in relation to the other beam of the same frequency and is reflected by an object in motion, to produce intensity variation that vary as a... | 10/23/1984 |
| 4479266 | Multiple-threshold optical receiver for a variable-rate digital data transmission system An optical receiver designed for operation in alternating-current transmission over a broad temperature range and having a very large dynamic range comprises a capacitor between the transimpedance circuit and two comparator circuits for processing a signa... | 10/23/1984 |
