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| Number | Title | Issue Date |
| 4665547 | Limiting amplifier for common mode feedback in telephone line feed circuits A signal limiting amplifier includes interstage limiting devices to restrict the range of output voltage signals. The devices are base-emitter circuits of transistors, one of which operates in response to one polarity of signals and has its collector term... | 05/12/1987 |
| 4658260 | Telescoping multiband antenna A plural band telescopic antenna, including a band for frequencies much higher than the frequencies of the AM/FM band, is realized by making one telescopic section into a dipole high frequency antenna with its coaxial cable feed line extending through the... | 04/14/1987 |
| 4649298 | Non-saturating tri-state driver circuit A single chip, bipolar logic circuit receives input signals in a differential amplifier or comparator stage coupled, without saturation, by differential current mirrors to drive an output stage of the push-pull variety. Various circuit arrangement are inc... | 03/10/1987 |
| 4647941 | Telescopic antenna extended by coaxial cable feed A plural band telescopic antenna, including an added band much higher than the frequencies of the AM/FM band, is realized by making one telescopic section into a center-fed, high frequency antenna and using its coaxial cable feed line for also coupling me... | 03/03/1987 |
| 4646332 | Twisted ring counter with recoverable disallowed states A twisted ring counter has a NOR gate with inputs from outputs of the last two stages thereof to detect and be activated by a combination of outputs which is found in all modes of operation of the counter. When activated by the combination, the gate provi... | 02/24/1987 |
| 4632552 | Cleaved-coupled-cavity-laser-driven system for measuring small signals A laser-driven interferometric signal sensing system has a cleaved-coupled cavity laser with separate stabilization servo loops of different time constants for the modulator and laser sections thereof. The laser section is biased above lasing threshold, a... | 12/30/1986 |
| 4631362 | Low resistance origination scan circuit An origination scan circuit for detecting circuit closure state in a loop circuit has a much lower impedance than does the typical loop circuit. Its source impedance is split into separate resistive parts for connecting opposite terminals of an office bat... | 12/23/1986 |
| 4630886 | Lightguide distributing unit A multishelf main distributing frame for lightguide fibers is provided in which each shelf includes a pair of spaced plates (67,68) for receiving cable fibers from the rear portion of the shelf, receiving cross-connect jumper fibers from the front portion... | 12/23/1986 |
| 4623888 | Multi-function control interface circuit An interface circuit includes programmable registers both for making provisioning signals available to a set of electric circuit devices, and for monitoring operation of at least a portion of those devices. Signals received from a control source are emplo... | 11/18/1986 |
| 4622519 | Multi-channel data signal combining arrangement An arrangement is shown for combining multisource randomly occurring data, such as seismic or sonar data, into a single output signal. Histories of simultaneously occurring data from each source are accumulated, and their power levels compared to determin... | 11/11/1986 |
| 4613990 | Radiotelephone transmission power control Power levels of first and second stations (10, 11) in a cellular radiotelephone system are dynamically adjusted from only one (10) of them. The second station receives signals from the first and, on the basis of the level of those signals, first adjusts i... | 09/23/1986 |
| 4612417 | Electronic battery feed circuit for telephone systems Resistive circuits are provided at the input of an electronic battery feed circuit feedback path for lowering the voltage level of feedback signals to a metallic signal feedback portion and a common mode signal feedback portion so a common mode amplifier ... | 09/16/1986 |
| 4596024 | Data detector using probabalistic information in received signals Received data signals in digital form are sampled a plurality of times during each bit interval and weighted to enhance the statistical effect of a predetermined intermediate amplitude range prior to accumulation over a bit time to obtain an initial avera... | 06/17/1986 |
| 4588961 | Amplifier with extended output drive capability An operational amplifier is provided with at least one output supplementary stage and current mirror amplifiers for coupling amplified signal current variations to drive supplementary output stage source and sink transistors. Those transistors have their ... | 05/13/1986 |
| 4580218 | Indexing subject-locating method A determination is made as to whether or not each word of a segment of a body of text is included in one or more multi-word subjects of a list of subjects included in the text. If a subject word is found, a further determination is made as to whether or n... | 04/01/1986 |
| 4578630 | Buck boost switching regulator with duty cycle limiting In a buck-boost, switching regulator, separate signals are developed to control duty cycles of regulator switches. Control exercised by a pair of feedback-determined reference signal voltages through which a ramp signal is swept at inputs of separate comp... | 03/25/1986 |
| 4556869 | Multi-function data signal processing method and apparatus A data signal is processed to change its form and spectral content without introducing undesirable frequency and amplitude effects. Multiple data signal states, which determine the essential characteristics of the output signal wave configuration, are uti... | 12/03/1985 |
| 4554631 | Keyword search automatic limiting method Database locations for user-supplied query keywords are individually determined. Those locations for the full set of query keywords and for successively smaller groups of such query keywords are screened for locations common to all words of a group. The s... | 11/19/1985 |
| 4541056 | Instruction system topic-interpreting method A topic announcement routine is provided and is called by an announce flag included in a flag field of an author-selected topic title definition in a course material database. Each call of such a flagged topic causes the routine to display for a student a... | 09/10/1985 |
| 4500844 | Ringing signal generator employing delta-modulation power amplification techniques A ringing signal generator is disclosed in which a low-level reference ringing signal, generated by a reference waveform generator (101), is amplified by a delta-modulation power amplifier (106, 108). The low-level reference signal is digitally encoded us... | 02/19/1985 |
| 4313211 | Single sideband receiver with pilot-based feed forward correction for motion-induced distortion Effects of multipath fading and Doppler frequency spread in a single sideband radio communication system are largely overcome by separating (17) from a received signal spectrum, a pilot frequency component including those effects and using that component ... | 01/26/1982 |
| 4310729 | Selector switch with common actuator both for circuit selection and for selection indication A switch (13) is provided with a common actuator (38) which is movable through successive discrete positions (47) for effecting successive circuit closures between a common circuit portion (21) and a selectable one of a plurality of conductors (20). In an... | 01/12/1982 |
| 4310722 | Mobile radiotelephone station two-way ranging system Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is determined by using the received signal for producing (32) ... | 01/12/1982 |
| 4201105 | Real time digital sound synthesizer Linearly binary-coded digital control signals representing specific time segments of musical sounds are used in part to control stepped ramp signal generators in a digital synthesizer which runs continuously on a fixed program. The ramp signals are used t... | 05/06/1980 |
| 4156854 | Differential amplifier balancing system Complementary outputs of a differential amplifier are individually peak detected and the resulting signals are applied to the amplifier differential input in a manner to cause the output peak excursions to have substantially the same direct current levels... | 05/29/1979 |
| 4151516 | PCM coder with shifting idle channel noise level Circuitry useful in PCM coders for effectively shifting the idle channel noise signal to a level midway between the code state boundaries thereby significantly reducing the likelihood that noise signals will cross a boundary and be encoded.... | 04/24/1979 |
| 4144411 | Cellular radiotelephone system structured for flexible use of different cell sizes The use of plural cell sizes in cellular high capacity mobile telecommunications systems is facilitated by providing dual service availability in an essentially geographically continuous large-cell grid and an overlaid and essentially geographically disco... | 03/13/1979 |
| 4142312 | Station set for mobile radiotelephone units A mobile radiotelephone station set base is provided with a pushbutton dialing pad in a first face and has a rectangular card-receiving slot in an adjacent face and opening into a card-receiving pocket extending into the base parallel to the first face. A... | 03/06/1979 |
| 4074212 | Multisection filter using inflected amplitude change function to sharpen its band-edge responses A signal to be filtered is subjected to a known filter function a sufficient plurality of times and with appropriate processing to produce in a plot of the total filtering response versus the response of one such function at least one inflection in a port... | 02/14/1978 |
| 4074072 | Multiprocessor control of a partitioned switching network by control communication through the network A centrally located stage of a time division multiplex switching network is partitioned into blocks and a separate processor is provided to control each such block. The partition is extended to the edge of the network by having each partition processor co... | 02/14/1978 |
| 4063617 | Cable lubricator A cable is passed through a lubricant filled chamber comprising an open housing and first and second flexible, annular discs each having radial slits along its inner circumference. A third flexible annular disc adjacent to said second disc includes radial... | 12/20/1977 |
| 4061049 | Mechanism for changing linear motion to substantially pivotal motion A length of bar stock is screw-threaded at two different thread pitches along respective fractions of its total length. Two bodies are internally threaded at the different pitches. Each body engages the bar stock along the portion of its length which is t... | 12/06/1977 |
| 4056696 | Flat panel telephone station set Subscriber-interface elements of a telephone station set are combined in and on a swivel panel. In one embodiment which is useful in automobile radiotelephone applications, the panel is a sun visor and includes arrangements to hold the handset in place ev... | 11/01/1977 |
| 4049920 | Analog signal summing conference circuit This specification discloses a telephone conferencing arrangement employed with a plurality of conference interface ports in a time division multiplex (TDM), private branch exchange (PBX). Each port receives from the PBX the TDM conference signal of a res... | 09/20/1977 |
| 4039979 | Reduction of aliasing distortion in sampled signals A method and apparatus for sampling continuous wave signals to reduce aliasing distortion. The signal is sampled at n times the Nyquist rate, where n is an integer greater than 1; and the n most recently produced sequential samples are combined at the Nyq... | 08/02/1977 |
| 4037117 | Peak shut-off electronic switch A control transistor and a pnpn device are arranged in serial combination with each other, as well as with a source of alternating current and a load. The transistor and pnpn device in combination behave as a two-state semiconductor switch for switching c... | 07/19/1977 |
| 4029900 | Digital synchronizing signal recovery circuits for a data receiver A data signal stream includes, in a noisy signal channel, periodic word synchronization characters, and each such stream is preceded by a burst of predetermined bit rate information. An approximate bit rate timing signal is derived from the data stream an... | 06/14/1977 |
| 4025853 | Method and apparatus for radio system cochannel interference suppression In a radio communication system of the cellular type wherein sets of communication channels are reused in different adjacent sets of cell areas within a common mobile communication service area, each cell base station utilizing a given set of channels in ... | 05/24/1977 |
| 4025735 | Negative conductance network Signal transmission circuit characteristics are supplemented by a negative conductance circuit in which current sources of complementary polarity are connected in shunt between the conductors of the signal circuit. Changes in the voltage level of one side... | 05/24/1977 |
| 4021622 | Nonlocking key telephone set A nonlocking key telephone station is arranged to display full line status information when the station is on-hook and for normally illuminating only the key lamp associated with the line in use at the station when the set is off-hook. To permit a user to... | 05/03/1977 |
