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| Number | Title | Issue Date |
| 5678059 | Technique for time-sharing a microprocessor between a computer and a modem A personal computer's microprocessor is time-shared to provide the functions formerly provided by a microprocessor dedicated to a modem. This technique is transparent to software applications programs which interact with a modem. The personal computer uti... | 10/14/1997 |
| 5406586 | Signal correlation technique The present invention relates to correlation apparatus in which samples of a received signal are demultiplexed and coupled to a plurality of correlators in cyclic fashion so that successive samples are coupled to a different correlator in the plurality. E... | 04/11/1995 |
| 5390177 | Conferencing arrangement for compressed information signals A conferencing bridging technique for compressed information signals which monitors the signal energy transmitted by each conferee. When there is only one conferee speaking, the summing circuit in the bridge unit is bypassed along with the speech decoding... | 02/14/1995 |
| 5371762 | Technique utilizing signal storing devices for cancelling signal dispersion A signal dispersion cancellation structure receives incoming signal samples at an incoming rate, stores these samples in a first memory and then writes these samples at a submultiple of the incoming rate into a plurality of second memories. Each second me... | 12/06/1994 |
| 5363441 | Technique for reducing echoes in conference communications Distortion and instability due to echoes in conference communications is reduced through the use of an echo estimating filter disposed in a conference bridging circuit. This circuit includes a signal combiner which receives information signals from each o... | 11/08/1994 |
| 5353312 | Equalizer-based timing recovery Timing recovery circuitry for recovering digital data generates a timing signal which is a function of the delay provided by an equalizer to one or more predetermined frequency components of its input signal. Advantageously, this approach is applicable to... | 10/04/1994 |
| 5353302 | Signal despreader for CDMA systems A signal despreader for use in a CDMA system processes samples of the received signal with filtered replicas of the code coefficient sequences associated with the system users. The symbols transmitted by each system user are recovered using a filtered rep... | 10/04/1994 |
| 5345468 | Despreading technique for CDMA systems Despreading of the received signal in a CDMA system is provided using code coefficient sequences which are derived from those utilized by the system users to encode their respective symbols. Each derived code coefficient sequence is a function of the corr... | 09/06/1994 |
| 5341395 | Data recovery technique for asynchronous CDMA systems To recover the bits from various users in an asynchronous CDMA communications system, samples of the received signal are processed using blocks of code coefficients. Each code coefficient block includes the sequence of code coefficients for each user whic... | 08/23/1994 |
| 5331670 | Synchronization scheme for a digital communications system A synchronization scheme for a digital communications system wherein customer data is connected to a synchronous communications network utilizes auxiliary symbols to provide frame synchronization. Each such auxiliary symbol lies outside of a conventional ... | 07/19/1994 |
| 5311570 | Integration of wireless paging in a communication system A communications switching system such as a PBX, central office switch and the like, responds to an incoming call to a called party by signaling a paging device as well as some other communications device having communications capability different from th... | 05/10/1994 |
| 5293597 | Concurrent context memory management unit A memory management arrangement facilitates interprocess data transfers by eliminating the need to construct temporary mapping tables when performing the data transfer operation. The arrangement includes the use of multiple and concurrent mapping tables i... | 03/08/1994 |
| 5278865 | Timing recovery scheme for a transceiver using a single sample clock source for transmitting and receiving signals The present invention addresses a timing synchronization problem which arises in tandem modem operation when a single codec strobed by a common sample clock is used for A/D and D/A signal conversion in a modem. Tandem modem operation is defined as a syste... | 01/11/1994 |
| 5267243 | Access scheme for a data communications network A data communications system wherein a plurality of stations each transmits data messages through a time-shared channel. In one embodiment of the invention, each data message is transmitted in either one of two alternative modes. In the first mode, a stat... | 11/30/1993 |
| 5260972 | Technique for determining signal dispersion characteristics in communications systems The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting a training sequence. This training sequence includes a plurality of predetermined symbols and has a time duration... | 11/09/1993 |
| 5251328 | Predistortion technique for communications systems The problem of noise enhancement is eliminated in communications systems by predistorting the amplitude of the transmitted information signal in a manner which compensates for the amplitude distortion introduced in a portion of the communications channel.... | 10/05/1993 |
| 5195085 | Communication link identifier In a communications system having components which are interconnected via communications links, the system is provided with capability of responding to the application of a predetermined test signal to a link with information which identifies that link. S... | 03/16/1993 |
| 5187722 | Frequency synthesis using fractional frequency multiplication Frequency synthesis apparatus for providing a desired frequency which is greater than and a fractional multiple, N/M, of a reference signal frequency utilizes a fractional multiplier in the feedback path of a phase-locked loop. The fractional multiplier p... | 02/16/1993 |
| 5185824 | Optical switch incorporating molded optical waveguide elements A structure for providing an N by N optical switch includes input and output structures disposed on either side of a planar electronic shutter array. Each of the input and output structures, which respectively provide optical signal splitting and combinin... | 02/09/1993 |
| 5184115 | Touch-screen arrangement In an arrangement wherein an inquiry and a choice of respones thereto are displayed on a CRT screen, a selection is made by holding a touch-screen device against the area of the screen corresponding to the desired response. Such a touch-screen device is d... | 02/02/1993 |
| 5177737 | Multipurpose bus system A multipurpose bus connects subsets of intercommunicating modular circuit packs in a complex electrical system. An individual one of the subsets may use the bus leads to transport signals differently from the other subsets. Each of the subsets of the circ... | 01/05/1993 |
| 5163066 | Synchronizing the operation of multiple equilizers in a digital communications system In a dual-duplex system wherein the communications channels have associated propagation delays which are typically different from one another, equalizers are connected to operate upon the signal received from each channel. To synchronize the operation of ... | 11/10/1992 |
| 5162812 | Technique for achieving the full coding gain of encoded digital signals In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multidimensional, passband signal illustratively at 480 kb/s. Specifically, the transmitted signal is encoded in a trelli... | 11/10/1992 |
| 5146494 | Overlapping look-up-and-add echo canceller requiring a smaller memory size An echo canceller which incorporates an overlapping look-up-and-add structure is suitable for cancelling both the linear and nonlinear components of an echo. In the well-known overlapping look-up-and-add structure, the cancellation provided is the sum of ... | 09/08/1992 |
| 5136120 | Technique for reducing electromagnetic interference At least one pair of areas on a circuit pack or substrate is allocated for the placement of electromagnetic interference (EMI) absorbing material, e.g., split ferrite cores. All or a portion of the conductor paths for the circuit are routed between pairs ... | 08/04/1992 |
| 5134633 | Digital communications synchronization scheme A synchronization scheme for use in digital communications systems selectively replaces data-representative symbols that would ordinarily be transmitted through a plurality of communications channels with associated replacement symbols that represent the ... | 07/28/1992 |
| 5117291 | Technique for adjusting signal dispersion cancellation apparatus in communications systems A technique for generating the tap-weight coefficients for a signal dispersion cancelling filter utilizes circuitry which is responsive to received signal samples and generates a time-ordered sequence of derived signal samples. The tap-weight coefficient ... | 05/26/1992 |
| 5115452 | Phase jitter correction arrangement In a communications system, a transmitted signal is typically impaired by phase jitter attributed to power line harmonics and ringing voltages present in a communications channel. In order to properly recover the transmitted signal, the phase jitter in a ... | 05/19/1992 |
| 5103376 | Dual position computer arrangement A computer including a keyboard portion and a display portion is interconnected in a manner which provides dual positions operational. In one position the keyboard portion may be horizontally positioned to facilitate the entry of data via the keyboard. In... | 04/07/1992 |
| 5095497 | Technique for achieving the full coding gain of encoded digital signals In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multi-dimensional, passband signal illustratively at 480 kb/s. Specifically, the transmitted signal is encoded in a trell... | 03/10/1992 |
| 5052000 | Technique for improving the operation of decision feedback equalizers in communications systems utilizing error correction The combined benefits of decision feedback equalization and error correction coding are realized in a communications system by the use of a plurality of coders and decoders respectively disposed in the transmitter and receiver. The plurality of encoders a... | 09/24/1991 |
| 5043982 | Multichannel multipoint network using time-division multiplexing incorporating a time offset for propagation delay Time-division multiplexing (TDM) is used for communications between each remote location and the central location of a multichannel, multipoint polling network. Each remote location transmits data in a TDM frame which has predetermined time intervals for ... | 08/27/1991 |
| 5025211 | Technique for reducing electromagnetic interference At least one pair of areas on a circuit pack or substrate is allocated for the placement of electromagnetic interference (EMI) absorbing material, e.g., split ferrite cores. All or a portion of the conductor paths for the circuit are routed between pairs ... | 06/18/1991 |
| 5008672 | Signal conversion apparatus which reduces quantization errors for telecommunications applications Signal conversion apparatus transforms an input signal having a value falling in one of a plurality of ranges into an output signal whose value varies for each different range. All of the output signal values corresponding to the plurality of ranges form ... | 04/16/1991 |
| 4996704 | Electronic messaging systems with additional message storage capability The present electronic messaging system allows a system subscribed to record a plurality of "customized" announcement messages. Each such message is associated with at least one calling party. Upon receiving an incoming communication for that subscriber, ... | 02/26/1991 |
| 4995057 | Technique for achieving the theoretical coding gain of digital signals incorporating error correction The theoretical coding gain associated with an error correction technique can be realized in a digital communications system employing this error correction by providing the equalization in the transmitter instead of the receiver. In a first embodiment, a... | 02/19/1991 |
| 4980767 | Technique for determining signal dispersion characteristics in communications systems The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting training sequences. More specifically, each sequence comprises a plurality of predetermined symbols and is transm... | 12/25/1990 |
| 4978907 | Apparatus and method for expanding the frequency range over which electrical signal amplitudes can be accurately measured It has been found that the ground lead of a measurement instrument probe has an inductance which, when coupled with the capacitance of the rest of the probe, forms a resonant circuit. The net result is a peak in the frequency response of the probe which i... | 12/18/1990 |
| 4943973 | Spread-spectrum identification signal for communications system A spread-spectrum signal which conveys identifying information for an associated information signal is superimposed on the associated signal and transmitted therewith. Such identifying information distinguishes between voice and data information signals a... | 07/24/1990 |
| 4902237 | Adaptor for surface mount and through-hole components An adaptor for interfacing a surface mount or through-hole electrical component to a printed circuit board. In one orientation of the adaptor relative to the printed circuit board, the adaptor receives a through-hole component and interfaces this componen... | 02/20/1990 |
