Patents Assigned to Conexant System, Inc.
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Patent number: 6556969Abstract: A low complexity speaker verification system that employs universal cohort models an automatic score thresholding. The universal cohort models are generated using a simplified cohort model generating scheme. In certain embodiments of the invention, a simplified hidden Markov modeling (HMM) scheme is used to generate the cohort models. In addition, the low complexity speaker verification system is trained by various users of the low complexity speaker verification system. The total number of users of the low complexity speaker verification system may be modified over time as required by the specific application, and the universal cohort models may be updated accordingly to accommodate the new users. The present invention employs a combination of universal cohort modeling and thresholding to ensure high performance.Type: GrantFiled: September 30, 1999Date of Patent: April 29, 2003Assignee: Conexant Systems, Inc.Inventors: Khaled Assaleh, Ayman Asadi
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Patent number: 6556591Abstract: A system for synchronizing the upstream burst transmission in a cable system to a time specified by the cable head end is disclosed. The system includes a free running counter within a cable modem (CM) or network interface unit (NIU), along with logic to capture the value of this free running counter at the time a frame of MPEG-2 SYNC data arrives, to create a time tag stored in memory. A computer within the cable modem or network interface unit has access to the time tags in memory and the contents of a time synchronization message from the head end, also stored in memory. The computer contains a program to calculate the value of the local counter that corresponds to a time to transmit commanded by the cable system head end. The system includes logic within the CM or NIU to initiate an upstream burst transmission when the value of the local counter becomes equal to a calculated value, thus causing the cable modem to initiate its upstream burst transmission precisely at the time commanded by the head end.Type: GrantFiled: July 19, 2001Date of Patent: April 29, 2003Assignee: Conexant Systems, Inc.Inventors: Brett Alan Bernath, John Milford Brooks, Manoj Mehta, Yoav Pesach Goldenberg
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Patent number: 6556966Abstract: A speech compression system with a special fixed codebook structure and a new search routine is proposed for speech coding. The system is capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech. The codebook structure uses a plurality of subcodebooks. Each subcodebook is designed to fit a specific group of speech signals. A criterion value is calculated for each subcodebook to minimize an error signal in a minimization loop as part of the coding system. An external signal sets a maximum bitstream rate for delivering encoded speech into a communications system. The speech compression system comprises a full-rate codec, a half-rate codec, a quarter-rate codec and an eighth-rate codec. Each codec is selectively activated to encode and decode the speech signals at different bit rates to enhance overall quality of the synthesized speech at a limited average bit rate.Type: GrantFiled: September 15, 2000Date of Patent: April 29, 2003Assignee: Conexant Systems, Inc.Inventor: Yang Gao
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Patent number: 6553040Abstract: A system for synchronizing the upstream burst transmission in a cable system to a time specified by the cable head end is disclosed. The system includes a free running counter within a cable modem (CM) or network interface unit (NIU), along with logic to capture the value of this free running counter at the time a frame of MPEG-2 SYNC data arrives, to create a time tag stored in memory. A computer within the cable modem or network interface unit has access to the time tags in memory and the contents of a time synchronization message from the head end, also stored in memory. The computer contains a program to calculate the value of the local counter that corresponds to a time to transmit commanded by the cable system head end. The system includes logic within the CM or NIU to initiate an upstream burst transmission when the value of the local counter becomes equal to a calculated value, thus causing the cable modem to initiate its upstream burst transmission precisely at the time commanded by the head end.Type: GrantFiled: July 19, 2001Date of Patent: April 22, 2003Assignee: Conexant Systems, Inc.Inventors: Brett Alan Bernath, John Milford Brooks, Manoj Mehta, Yoav Pesach Goldenberg
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Patent number: 6549986Abstract: A low power instruction cache is disclosed. There are a number of tag memory banks. Each tag memory bank is associated with a unique instruction cache. Each tag memory bank has a number of tag memory rows and each tag memory row has a number of tag memory cells. Certain upper bits of a program counter are compared to a tag stored in one row of a tag memory bank. If there is a match between the certain upper bits of the program counter and the tag, a hit signal is generated. The hit signal indicates that the tag memory bank containing the matched row (i.e. the matched tag) is associated with the instruction cache having a desired instruction. The desired instruction is then read from the instruction cache associated with the tag memory bank corresponding to the generated hit signal. Thus, instead of reading one instruction from each of the instruction caches and then eliminating all but one of the read instructions, only the desired instruction from a single instruction cache is read.Type: GrantFiled: June 20, 2000Date of Patent: April 15, 2003Assignee: Conexant Systems, Inc.Inventor: John R. Spence
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Patent number: 6550046Abstract: An automated method for packing cells in the generation of an integrated circuit design layout that is especially useful for circuits having symmetry constraints, which is the case for most analog circuits, uses sequence pair encoding and simulated annealing. From the set of all cells needed to implement the circuit, subsets of the cells are defined that must exhibit symmetry. Symmetry constraints are defined for each subset and the cells are encoded as ordered sequence-pairs. To reduce the solution space, the initial sequence pair encoding is required to be symmetry-feasible and the annealer subspace is limited to symmetry-feasible sequence-pairs.Type: GrantFiled: October 1, 1999Date of Patent: April 15, 2003Assignee: Conexant Systems, Inc.Inventors: Florin Balasa, Koen Lampaert
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Patent number: 6546046Abstract: A DSL communication system including a DSL transmission unit at a central office (DTU-C) and a DSL transmission unit at a remote location (DTU-R) in communication over a communication link. DTU-C and DTU-R are capable of transmitting and receiving packets of data prior to synchronization or training. DTU-C transmits a discovery message to DTU-R and awaits receiving a discovery response message from DTU-R. After receiving the discovery response message, DTU-C transmits a probe message to DTU-R followed by a probe signal. DTU-R measures the line quality while receiving the probe signal. After receiving the probe signal, DTU-R transmits a probe signal to DTU-C, using which signal DTU-C measures the line quality. After transmitting the probe signal, DTU-R transmits a probe response message, including line quality measurements performed by DTU-R.Type: GrantFiled: July 31, 2000Date of Patent: April 8, 2003Assignee: Conexant Systems, Inc.Inventors: Ralph F. Sweitzer, Dean E. Rasmussen, Mickey C. Rushing
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Patent number: 6546098Abstract: A telephony services distribution system includes a voice/data server that receives and transmits telephony data in accordance with a suitable digital communication protocol. The voice/data server is associated with a customer premise that supports a number of enhanced telephony devices, which may include wired and/or wireless telephone devices, videophone devices, facsimile devices, or the like. The customer premise may also support any number of conventional POTS telephony instruments. The voice/data server and the enhanced telephony devices communicate signaling data therebetween via a signaling technique such as the V.21 modem protocol. The signaling information conveys data associated with the status of the enhanced telephony devices, calling party and called party identification, characteristics of the incoming and outgoing calls, and/or data related to any number of operating parameters and characteristics of the system.Type: GrantFiled: June 21, 1999Date of Patent: April 8, 2003Assignee: Conexant Systems, Inc.Inventor: P. Michael Henderson
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Patent number: 6542537Abstract: A communication system implements a system for reducing the processing burden associated with detecting an escape sequence in a set of data. The quantity of data contained within the modem's data buffer is intermittently compared to a threshold. While the quantity of data remains above a selected threshold, the data is not checked for an escape sequence. If the quantity of data falls below the threshold, the modem initiates an escape sequence detection procedure. Because the data source waits for a confirmation signal from the modem after sending the escape sequence, additional data will not be received in the data buffer. Thus, the escape sequence is typically among the most recently received data in the data buffer. As the modem processes the data in the buffer, the quantity falls below the threshold, activating the escape sequence detection procedure.Type: GrantFiled: March 9, 1999Date of Patent: April 1, 2003Assignee: Conexant Systems, Inc.Inventors: Joel D. Peshkin, Paul Wren
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Patent number: 6539068Abstract: A desired signal having a wide frequency band and including sequential symbols representing digital values is discriminated from a narrow band interfering signal having a carrier frequency in the wide band by initially applying both signals to a filter so both signals are passed to an output of the filter. In response to the filter output, estimates of the values of received symbols of the desired signal are derived and compared to the filter output to derive an error representing signal. A characteristic of the filter is controlled in response to the error representing signal so the filter is adjusted to reject the interfering signal and pass the desired signal.Type: GrantFiled: January 21, 2000Date of Patent: March 25, 2003Assignee: Conexant Systems, Inc.Inventors: Yoav Hebron, Sree A. Raghavan, Itzhak Gurantz
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Patent number: 6534854Abstract: A pin grid array package comprises a number of signal pins and ground pins. At least one of the signal pins is a controlled impedance signal pin, i.e. a signal pin whose impedance is adjusted and/or reduced according to the present invention. The pin grid array package also includes a number of ground planes and signal planes. A controlled impedance signal pin is coupled to one of the signal planes by means of a signal via. A number of ground pins surround the controlled impedance signal pin. By varying the arrangement, number, and separation distance between the ground pins and the controlled impedance signal pin, the impedance of the signal pin is adjusted and/or reduced. Depending on the particular circuit or logic function assigned to a signal pin and its adjacent signal pin, a different degree of impedance control and/or reduction can be achieved by the present invention.Type: GrantFiled: November 8, 2001Date of Patent: March 18, 2003Assignee: Conexant Systems, Inc.Inventors: Siamak Fazelpour, Hassan S. Hashemi, Roberto Coccioli
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Patent number: 6535850Abstract: In a speech training and recognition system, the current invention detects and warns the user about the similar sounding entries to vocabulary and permits entry of such confusingly similar terms which are marked along with the stored similar terms to identify the similar words. In addition, the states in similar words are weighted to apply more emphasis to the differences between similar words than the similarities of such words. Another aspect of the current invention is to use modified scoring algorithm to improve the recognition performance in the case where confusing entries were made to the vocabulary despite the warning. Yet another aspect of the current invention is to detect and warn the user about potential problems with new entries such as short words and two or more word entries with long silence periods in between words. Finally, the current invention also includes alerting the user about the dissimilarity of the multiple tokens of the same vocabulary item in the case of multiple-token training.Type: GrantFiled: March 9, 2000Date of Patent: March 18, 2003Assignee: Conexant Systems, Inc.Inventor: Aruna Bayya
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Patent number: 6535959Abstract: A circuit and method for reducing power in a memory, such as an instruction cache, having a number of blocks, are disclosed. A power reduction signal (also called a “same block” signal) is generated. The power reduction signal indicates whether a subsequent instruction to be fetched from an instruction cache belongs in the same block as a previous instruction fetched from the same instruction cache. When the subsequent instruction belongs to the same block as the previous instruction, there is no need to perform a tag read or an instruction read from an instruction cache other than the same instruction cache which contains the block to which the subsequent instruction belongs, whereby a tag from a tag memory bank is not read when the power reduction signal is in a first logical state.Type: GrantFiled: September 5, 2000Date of Patent: March 18, 2003Assignee: Conexant Systems, Inc.Inventors: Sumant Ramprasad, Sameer I. Bidichandani
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Patent number: 6535551Abstract: A DSL communication system including a DSL transmission unit at a central office (DTU-C) and a DSL transmission unit at a remote location (DTU-R) in communication over a communication link. DTU-C and DTU-R synchronize or train at a first data rate. After synchronization, DTU-C and/or DTU-R measure the line quality at the first data rate. The line quality may be measured based on bit-error-rate, attenuation level and/or signal-to-noise ratio. A second data rate is then selected based on the line quality measurements. DTU-C may then initiate a rate change request, according to which DTU-C and DTU-R may re-synchronize at the second rate. The second rate may be several data rates higher or lower than the first data rate.Type: GrantFiled: July 31, 2000Date of Patent: March 18, 2003Assignee: Conexant Systems, Inc.Inventors: Ralph F. Sweitzer, Dean E. Rasmussen, Mickey C. Rushing
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Patent number: 6532511Abstract: An electronic bridging device for transferring electronic data between a first device attached to a system bus and a peripheral device attached to a peripheral bus using a bridging circuit. The DMA controller comprises a system bus interface circuit for connecting the DMA controller to the system bus, a peripheral bus interface circuit for connecting the DMA controller to the peripheral bus, a data transfer request circuit for receiving data transfer requests from devices attached to the peripheral bus, and a control logic circuit for controlling the operation of DMA data transfer operations. Immediately upon receipt of one or more data transfer requests, the bridging device performs the following operations: requests access to the system bus, concatenates all pending peripheral bus data words into a single transfer, and transfers all pending requests across the bridging circuit.Type: GrantFiled: September 30, 1999Date of Patent: March 11, 2003Assignee: Conexant Systems, Inc.Inventor: John Milford Brooks
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Publication number: 20030046459Abstract: A two-dimensional direct memory access system that maximizes processing resources in image processing systems. The present invention includes a two-dimensional direct memory access machine. Also, it employs a ping-pong style memory buffer to assist in the transfer and management of data. In certain applications of the invention, the type of data used by the invention is image data. The two-dimensional direct memory access machine transfers a specific cross sectional area of the image data to a processor. The efficient method of providing the processor only with the specific cross sectional area of the image data that is to be processed at a given time provides decreased processing time and a better utilization of processing resources within the two-dimensional direct memory access system.Type: ApplicationFiled: August 12, 2002Publication date: March 6, 2003Applicant: Conexant Systems, Inc.Inventors: Hooman Honary, Anatoly Moskalev
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Patent number: 6529867Abstract: A filtered noise is generated by passing a high frequency noise signal through a high pass filter. The filtered high frequency noise is injected in to the pulse output of the codebook through convolution. The combined noise signal and pulse output generates a perceptually enhanced encoded speech signal.Type: GrantFiled: January 5, 2001Date of Patent: March 4, 2003Assignee: Conexant Systems, Inc.Inventor: Yang Gao
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Patent number: 6529975Abstract: In one embodiment, a single designated register in a codec is utilized by a controller to address and control a large number of expansion registers belonging to various expansion devices. The controller can write to or read from the designated register through an AC-link while complying with the AC '97 specification. The address and data bits in the designated register are used to write to or read from a target register in an expansion device. The designated register is selected from one of the 16 registers available to a design engineer in accordance with the AC '97 specification. An example of an expansion device that can be addressed and controlled through the designated register is an SSD device. In another embodiment, two designated registers in the codec register set are utilized. The controller can write address information into one of the designated registers while complying with the AC '97 specification.Type: GrantFiled: November 2, 1999Date of Patent: March 4, 2003Assignee: Conexant Systems, Inc.Inventors: Mark E Miller, David P Braun
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Patent number: 6529712Abstract: A system for amplifying a transmitted signal is provided. The system includes a receiver that receives the transmitted signal and generates a conducted signal from the transmitted signal. A non-linear oscillator, such as a synchronous oscillator that is operating in a borderline stable condition, is connected to the receiver. The non-linear oscillator receives the transmitted signal from the receiver and amplifies the transmitted signal without modifying the frequency of the transmitted signal, or its relative phase. The amplification by a non-linear oscillator causes the signal to be amplified relative to the noise, thus improving the signal-to-noise ratio.Type: GrantFiled: August 25, 1999Date of Patent: March 4, 2003Assignee: Conexant Systems, Inc.Inventors: William J. Domino, Darioush Agahi-Kesheh, Dmitriy Rozenblit, Mark Oskowsky
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Patent number: 6529598Abstract: The line interface circuit of a modem to be connected to a standard RJ11 jack of a digital PBX (Private Branch Exchange) is used along with software routines resident in the modem to detect the presence of a PBX connected to the modem. Upon going off-hook, the modem, by the software routines, determines whether the connection will harm the interface by one of several software routines. If it appears that the interface circuit may be damaged because a PBX line is present, the modem is instructed to go on-hook (hang up), or if the connection is not harmful to the interface, alerts the user that the modem is connected to a wrong jack.Type: GrantFiled: May 14, 1999Date of Patent: March 4, 2003Assignee: Conexant Systems, Inc.Inventors: Frank Sacca, Alberto Mantovani, James Bunde Villadsen Skov