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| Number | Title | Issue Date |
| 7417943 | Dynamic compression training method and apparatus An apparatus for communicating between an access endpoint and a mobile device endpoint comprising a network service center attached to the access endpoint. A memory stores a prototype corpus representing historical communication information. The network service cent... | 08/26/2008 |
| 7372871 | Techniques to reduce information loss and translation costs in a system populated with data sources and sinks communicating with multiple data representations Techniques for reducing overall information loss and processing costs due to data translation in a network populated with communicating data sources and sinks of multiple data representations is described. By employing an “optimization” technique for negotiating... | 05/13/2008 |
| 7296063 | Active stream format for holding multiple media streams An active stream format is defined and adopted for a logical structure that encapsulates multiple data streams. The data streams may be of different media. The data of the data streams is partitioned into packets that are suitable for transmission over a transport m... | 11/13/2007 |
| 7224739 | Controlled frequency signals In some embodiments, a transmitter includes first encoding controlled frequency output circuitry to creates a magnitude encoded controlled frequency signal (CFS) and second encoding controlled frequency output circuitry to create a complementary a magnitude encoded ... | 05/29/2007 |
| 7130337 | Method and system for sample and recreation synchronization for digital transmission of analog modem signal A method and system for the synchronization of the transmission of digitally converted analog modem signals between two or more modems using either RF over-the-air or A/C power line communication channels. This invention provides for modem speed optimization my mini... | 10/31/2006 |
| 6972786 | Multimedia services using central office A system for providing video communication services to one or more premises with video communications-services users, comprising a first premises network, a plurality of user workstations interconnected by the first premises network, and a multimedia central office ... | 12/06/2005 |
| 6920188 | Method and apparatus for processing a multiple-component wide dynamic range signal An apparatus is provided for processing a wide dynamic range analog signal which comprises multiple components such as a signal with an in-phase component and a quadrature-phase component in for example separate I and Q data channels, wherein each channel has a dyna... | 07/19/2005 |
| 6643714 | Modification and use of configuration memory used during operation of a serial bus Information stored in configuration memory of a first device coupled to a communication bus is exposed to other devices allowing the other devices to ascertain the functionality of the first device. A device driver corresponding to the device can, through... | 11/04/2003 |
| 6385656 | Selective recompression of files in a network system A recompression server that automatically decompresses selected pre-compressed data streams and recompresses the decompressed data to a greater degree than the original pre-compressed data. In one embodiment, the recompression server determines from a req... | 05/07/2002 |
| 6317613 | Audio in a mobile receiver A system and method are disclosed whereby, in order to achieve a desired receive audio dynamic range compression factor (e.g., 2:1) at higher background noise levels, an analog mobile station's receiver is inhibited from expanding the received compressed ... | 11/13/2001 |
| 6111935 | Adaptive expansion table in a digital telephone receiver A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote party (90). The send equipment (40) comprises an A-law map (1... | 08/29/2000 |
| 5907584 | System and method for transmitting and receiving a Lincompex signal having information encoded thereon through angle modulation The system and method of the present invention include a modulator which encodes data on a communication signal using angle modulation. The demodulator, receiving the angle modulated communication signal, angle demodulates the angle modulated communicatio... | 05/25/1999 |
| 5689440 | Voice compression method and apparatus in a communication system The present invention comprises a method for compressing a plurality of voice signals within a voice communication resource (see FIG. 6) having a given bandwidth within a voice communication system (100). The method comprises the steps of subchanneling th... | 11/18/1997 |
| 5678198 | System for controlling signal level at both ends of a transmission link, based upon a detected value The present invention is directed to a dynamic range enhancing system for increasing the dynamic range of a transmission link, characterized as either an analog or digital link. The system includes a pre-processing unit, provided at a first location, that... | 10/14/1997 |
| 5652782 | Digital telephone overcoming international incompatibilities A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote party (90). The send equipment (40) comprises an A-law map (1... | 07/29/1997 |
| 5631648 | Signal compression or expansion circuit for mobile communication A signal-processing circuit adapted for signal compression and expansion performed in the transmitter and receiver of mobile communication equipment. The signal-processing circuit comprises a multiplication type D/A converter to which an analog signal is ... | 05/20/1997 |
| 5495468 | System and method for transmitting plural information waveforms over a single communications channel using lincompex techniques At least two information waveforms are transmitted over the same communications channel using Lincompex techniques. Each of the information waveforms are modulated using Lincompex techniques to generate compressed information waveforms and associated cont... | 02/27/1996 |
| 5491685 | System and method of digital compression and decompression using scaled quantization of variable-sized packets A system and method of compressing and decompressing a digital signal using scaled quantization of variable-sized packets of difference samples. Difference samples are generated and subdivided into packets. Packet boundaries may be moved to maximize resol... | 02/13/1996 |
| 5377255 | RF repeaters for time division duplex cordless telephone systems An RF repeater for interfacing with a base station for exchanging transmit and receive signals in a time division duplex cordless telephone system comprises a multicarrier amplifier having an input and an output and a transfer switch connected to the ampl... | 12/27/1994 |
| 5363207 | Adaptor device for a facsimile Data produced from a transmission source facsimile are received by a simulated communication circuit network, and thus received data are compressed and temporarily stored into a memory. After the data have been compressed, the data stored in the memory ar... | 11/08/1994 |
| 5249174 | Time-division communication method for mobile bodies and system using said method A mobile body communication method using a gateway exchanging unit for exchanging a communication between a radio base station and a plurality of mobile radio units, the radio station constituting a service area covering a plurality of zones, the mobile r... | 09/28/1993 |
| 5182762 | Modem having speed notifying means A modem is connected to a terminal equipment and couples to another modem via a transmission line. The modem includes a data transmission and reception part for making data transmission and reception with the terminal equipment, and a modem part for deter... | 01/26/1993 |
| 5058202 | System and method of transmitting and receiving a licompex modulated signal over a communication channel utilizing frequency modulation techniques A system for transmitting and receiving frequency modulated signals utilizes linked compressor/expander (Lincompex) techniques. The signal to be transmitted is first processed by a Lincompex modulator which infinitely compresses the signal and produces a ... | 10/15/1991 |
| 4907217 | System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques Complex waveforms may be transmitted using Lincompex techniques by frequency shifting either the complex waveform, its envelope, or both, in order to ensure that the compressed complex waveform and the envelope signal are transmitted without any substanti... | 03/06/1990 |
| 4823342 | Time division exchange system having functions of compressing and expanding information A time division exchange provided with a plurality of compression circuits for carrying out signal compression in accordance with a plurality of compression laws and a plurality of expansion circuits for carrying out signal expansion in accordance with a ... | 04/18/1989 |
| 4740993 | Digital companding circuit A circuit for companding digital signals, incorporating a bidirectional barrel shifter in the form of an array of transmission gate cells for shifting step bits of a compressed PCM signal a predetermined number of locations to the left in response to the ... | 04/26/1988 |
| 4597073 | Full-duplex split-speed data communication unit for remote DTE The disclosed data communication equipment (DCE) provides full-duplex, split-speed data communication over 2-wire dial-up telephone circuits, typically between a host processor and data terminal equipment (DTE). A telephone line interface includes low spe... | 06/24/1986 |
| 4562571 | Speech processing device for radioelectric equipment adapted for speech transmission and reception The device is of the type comprising a circuit for compressing the dynamic of the speech signal before transmission of the signal at constant level and an expander for re-establishing at reception the speech level before compression thereof. A logic filte... | 12/31/1985 |
| 4549304 | ADPCM Encoder/decoder with signalling bit insertion In an ADPCM transmission system, signalling frames of an incoming multiplexed PCM signal are identified and signalling bits extracted therefrom. During each signalling frame, an ADPCM encoder/decoder is controlled by the signalling frame signal to operate... | 10/22/1985 |
| 4542265 | Echo canceller dynamic range extension Echo cancellers provide echo return loss enhancement by subtracting a replica of the echo signal from the echo returned via the two-wire to four-wire transition. The echo replica is derived from the signal incoming from the far end by signal processing wh... | 09/17/1985 |
| 4535471 | Compression/expansion device A compression/expansion device is adapted to compress and expand gains of additive and subtractive signals at each level of at least two audio signals, characterized in that each audio signal or any one of the additive and subtractive signals is compresse... | 08/13/1985 |
| 4531208 | Apparatus and method for reducing telephone channel power loading Conventional telephone systems including terminal equipments interconnected by a communications channel typically employ a supervisory tone transmitted by each terminal equipment to indicate its idle condition. Because the fraction of idle terminal equipm... | 07/23/1985 |
| 4513279 | Charge redistribution mu-law PCM decoder An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch means cyclically connects C2 between ground and either grou... | 04/23/1985 |
| 4507650 | Charge redistribution A-law PCM decoder An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch means cyclically connects C2 between ground and either grou... | 03/26/1985 |
| 4486876 | Broadband transmission on limited bandwidth digital line To insure timing recovery, T carrier requires that the signal contain no more than fifteen consecutive zeros and a "1"s density of at least one out of eight. When a 15 kHz audio program signal is converted into 12-bit words and four words inserted into si... | 12/04/1984 |
| 4468653 | Charge redistribution mu-law PCM decoder An integratable PCM decoder requiring a total capacitance of only 32 times the normalized capacitance Co of the smallest capacitor thereof. The decoder comprises a source of positive and negative reference voltages, a differential input operational amplif... | 08/28/1984 |
| 4396907 | Digital to analog converter which uses main and auxiliary resistor networks A digital-analog converter functioning according to the μ-law wherein a sequence control receives an input digital signal and controls the position of a plurality of switches so as to selectively apply positive or negative voltages to a main resistor net... | 08/02/1983 |
| 4388729 | Systems for reducing noise in video signals using amplitude averaging of undelayed and time delayed signals Noise reduction of a signal such as a video signal is effected by averaging a plurality of relatively delayed replica signals, e.g. with line or field delays therebetween, in a decoding processor, the highly redundant information content of the signal bei... | 06/14/1983 |
| 4324000 | Termination circuit for FDM/TDM processors An interface circuit is provided to convert serial, 30 channel, compressed, sign magnitude FDM-PCM data provided by a pair of voice communication codecs (code/decode) into parallel, 60 channel, expanded (linear), 2's complement PCM data, so that it can be... | 04/06/1982 |
| 4309676 | Instantaneous compressor and instantaneous expandor An instantaneous compressor and an instantaneous expandor both of which use the logarithmic characteristics of diodes to provide compression and expansion, respectively, of uncompressed analog PAM signals and compressed analog PAM signals. Both the compre... | 01/05/1982 |
