Patents Assigned to Conexant System, Inc.
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Patent number: 6731749Abstract: A telephone line interface circuit is disclosed having intelligent line current control that can adjust to the various requirements of worldwide telephone systems (DC masks), and/or can reduce the power consumed by the interface circuit. A controller reads a voltage value and based on the theoretical model of a telephone line network, and the expected current/voltage characteristic, as dictated by the appropriate DC mask. The controller sets the line current (via an output voltage) to an optimum value and causes the line voltage to adjust so as to comply with the DC mask and/or minimize power dissipation in the circuit.Type: GrantFiled: May 14, 1999Date of Patent: May 4, 2004Assignee: Conexant Systems, Inc.Inventors: Frank Sacca, Raphael Rahamim, James Bunde Villadsen Skov, Eric Floyd Riggert
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Patent number: 6728817Abstract: A communications system includes at least two communications devices, a bus, and a controller for the bus. The communications system may be a riser card, including communications devices such as a DSL device, for example, and a HomePNA device, and the bus can be an integrated packet bus, using an integrated packet bus controller for controlling communications from the computer with the communications devices. The bus supports a communications protocol, which includes a control slot and data slots. Each bit of the control slot selects which of the data slot bits belongs to which of the communications devices. For example, with two communications devices, a 16-bit control slot can be filled with the bit pattern “0000111111111111” which indicates that the first 4 bits of the 16-bit data slot belong to the first communications device and the second 12 bits belong to the second communications device.Type: GrantFiled: February 12, 2001Date of Patent: April 27, 2004Assignee: Conexant Systems, Inc.Inventor: Conrad A. Maxwell
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Patent number: 6728942Abstract: In one disclosed embodiment, a number of parameter values for an RF MOSFET are received. Examples of parameter values are style, bulk contact, finger width, finger length, number of fingers, current, and slice parameter values. From the received parameter values, a number of parasitic values for a subcircuit model of the RF MOSFET are determined. For example, parasitic resistor values and parasitic capacitor values of the RF MOSFET are determined. The parasitic resistor values and parasitic capacitor values are used in simulating the circuit comprising the RF MOSFET. An RF MOSFET layout is then generated that results in parasitic values that are the same as the parasitic values already used in simulating the circuit comprising the RF MOSFET. As such, the parasitic values of the RF MOSFET have already been taken into account in the initial circuit simulation.Type: GrantFiled: June 12, 2001Date of Patent: April 27, 2004Assignee: Conexant Systems, Inc.Inventors: Koen Lampaert, Andy Brotman, Paolo Miliozzi, Paramjit Singh, Mishel Matloubian, Bijan Bhattacharyya
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Patent number: 6727959Abstract: A system and method for performing real-time gamma correction of video in which a pixel having multiple components, e.g., RGB components, can be gamma corrected through a single access to a lookup table.Type: GrantFiled: November 22, 1999Date of Patent: April 27, 2004Assignee: Conexant Systems, Inc.Inventor: Michael A. Eskin
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Patent number: 6728308Abstract: Half-duplex mode in V.34 facsimile modems can be exploited using symbol rate re-negotiation to enhance performance and throughput. The enhancement is useful for facsimile servers and for facsimile transmission over Internet Protocol (“FAX-over-IP”) network applications. Extending the modem's symbol rate from the current maximum of 3429 symbols per second standard to a higher rate of symbol transmission can quickly enhance throughput. The technique is useful for fast primary channel retrains and for situations in which symbol rates are to be reduced. The technique is also useful for changing the requested symbol rate with data rate negotiation in situations in which data rate selection for the new symbol rate may not be known.Type: GrantFiled: September 30, 1999Date of Patent: April 27, 2004Assignee: Conexant Systems, Inc.Inventors: Keith T. Chu, Sverrir Olafsson
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Patent number: 6724829Abstract: A system for use in transmitting digital data includes a modulation element that receives block of digital data and modulates each block using one of at least two modulation types, such as QPSK and k-QAM, where k is a power of 2. The system also includes an automatic power control element that applies a selected gain value to each of the blocks of data before transmission. The automatic power control element selects each of the gain values from a group of at least two predetermined gain values, each of which corresponds to one of the modulation types. In general, the modulation types have different associated average power levels, and the power control element selects the gain values to maintain substantially constant average transmission power level among all of the blocks of data.Type: GrantFiled: March 18, 1999Date of Patent: April 20, 2004Assignee: Conexant Systems, Inc.Inventors: Shimon Tzukerman, Gadi Kalit, Ladd S. El Wardani
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Publication number: 20040073433Abstract: A multi-channel speech processor for encoding speech in a packet network environment is disclosed. In one illustrative aspect, a complexity resource manager (CRM) is executed by a controller or processor. The CRM manages the level of complexity of encoding which is used by a signal processing unit (SPU) to convert the speech signal into packet data. In general, the CRM determines the level of complexity of encoding based on a calculated complexity budget, where the complexity budget is determined based on the time required to process prior speech signal channels and the time available to process the remaining channels. In this way, the CRM is able to control the overall complexity of the speech processor through its ability to signal the SPU to encode speech signal in a complexity reduced mode based on the calculated complexity budget under certain conditions.Type: ApplicationFiled: October 15, 2002Publication date: April 15, 2004Applicant: Conexant Systems, Inc.Inventors: Eyal Shlomot, Huan-Yu Su
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Patent number: 6718355Abstract: A digital FIR filter is provided that inputs a series of data samples x[0] . . . x[n] and generates a partial sum output PS[i], where i≦n. The partial sum output is a weighted version of the a difference between a partial sum of the previous i−1 data samples, PS[i−1], and the current data sample x[n] added to the current data sample x[n]. The filter includes a plurality of weighting stages. Each weighting stage includes a first adder for subtracting the current data sample x[n] from the previous partial sum PS[i−1], a multiplier that multiplies the difference by a weighting coefficient, and a second adder that sums the weighted difference with the current data sample. The filter also includes a plurality of delay elements, each of which inputs a partial sum and imposes a unit delay on the partial sum before supplying it to a weighting stage.Type: GrantFiled: February 5, 2001Date of Patent: April 6, 2004Assignee: Conexant Systems, Inc.Inventors: Benjamin E. Felts, III, Wilson Wang
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Patent number: 6714260Abstract: A digital imaging system generates a composite video signal and the carrier frequency of a desired television channel is generated internal to the imager integrated circuit. The carrier frequency is then amplitude modulated with the composite video signal by either digital or analog means located on-chip. Thus, a radio frequency signal that can be picked up by conventional television receivers is directly synthesized on-chip to provide a wireless video link.Type: GrantFiled: July 23, 1998Date of Patent: March 30, 2004Assignee: Conexant Systems, Inc.Inventor: Joshua I. Pine
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Patent number: 6714645Abstract: A telephone line interface circuit which does not require a hookswitch relay is disclosed. An optoisolator is utilized to place a telephone line interface circuit on-hook and off-hook. In one embodiment, the optoisolator is controlled by an optoisolator control signal generated by a communications device such as a modem. An output of the optoisolator is coupled to an input of a DC control circuit. An output of the DC control circuit is coupled to a AC switch. When the optoisolator input control signal is activated, the optoisolator output enables voltage or current bias to the transistor, which places the telephone line interface circuit off-hook. When the optoisolator input control signal is deactivated, the optoisolator output disables voltage or current bias to the transistor, which places the telephone line interface circuit on-hook. In one embodiment, the DC control circuit is an electronic inductor comprising a pair of NPN transistors connected in a Darlington configuration.Type: GrantFiled: July 18, 2000Date of Patent: March 30, 2004Assignee: Conexant Systems, Inc.Inventors: Frank Sacca, Charles F. Raasch
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Patent number: 6711138Abstract: A digital subscriber line (DSL)/home phoneline network router provides DSL connectivity and home networking support. The router provides a single phoneline connection (RJ-11 jack) to access either the Internet or a home phoneline network. In terms of hardware, the router may include a central processing unit, a DSL modem, and a home phoneline networking device (media access controller and home phoneline networking physical interface). In terms of software, the router may include a DSL driver, a local area network (LAN) driver, a media access controller driver, network routing stacks and a real time operating system.Type: GrantFiled: September 30, 1999Date of Patent: March 23, 2004Assignee: Conexant Systems, Inc.Inventors: Prasan Pai, Nick C. Burd, Kevin V. Strong, P. Michael Henderson
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Patent number: 6707457Abstract: Embodiments of the invention comprise a new device and technique to realize an improved graphics generation system. This improvement is preferably achieved by implementing an interface logic portion to interface with the CPU, a control register portion, a pixel FIFO array portion, a pixel processing logic portion, and a control logic portion. These portions are preferably implemented as an extension of the internal architecture of the CPU. The CPU may be attached to the graphics system via a data cache and a write buffer portion. Data is read from the system memory and placed in the data cache so that subsequent accesses to the same location only require access to the cache. System memory data is written to a write buffer, so that the data written may be queued up and sent to the main memory at an appropriate time. The display refresh controller also reads the data from the system memory and converts the data to a signal for output to a display.Type: GrantFiled: September 30, 1999Date of Patent: March 16, 2004Assignee: Conexant Systems, Inc.Inventor: Matthew Damian Bates
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Publication number: 20040047454Abstract: The startup, retrain, renegotiation quick connect or other processes of handshaking between communication systems involve the exchange of certain modulation, constellation, precoder, prefilter and other communication related information. The communication systems exchange one long information sequence including all the necessary communication information. Subsequently, the communication systems start transmitting short sequences, including an acknowledgement information portion. If one of the communication systems does not receive an acknowledgement within a predetermined time or event, that communication system may retransmit another long information sequence. After such retransmission, the retransmitting communication system may continue transmitting the long information sequences or may start transmitting the short sequences once again. Eventually, each of the communication systems should receive a long information sequence and acknowledge their receipt of such sequence.Type: ApplicationFiled: August 12, 2003Publication date: March 11, 2004Applicant: Conexant Systems, Inc.Inventor: Sverrir Olafsson
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Publication number: 20040047423Abstract: In one aspect, a method for encoding pictures is provided. The method is applied to each picture in a sequence of pictures, and the method comprises the steps of assigning a pre-decoder buffer removal time to the picture; selecting, for the picture, a number of bits, wherein the time-equivalent of the number of bits is no greater than a difference based on the pre-decoder buffer removal time of the picture and an initial arrival time of the picture into a pre-decoder buffer; and compressing the picture to generate the number of bits. The method may further include the step of allocating a first number of bits for compressing the picture and one or more number of bits for compressing one or more future pictures, wherein the future pictures are in the pre-decoder buffer at the pre-decoder buffer removal time of the current picture.Type: ApplicationFiled: September 5, 2003Publication date: March 11, 2004Applicant: Conexant Systems, Inc.Inventors: Eric Viscito, Dzung T. Hoang
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Patent number: 6704399Abstract: The startup, retrain, renegotiation quick connect or other processes of handshaking between communication systems involve the exchange of certain modulation, constellation, precoder, prefilter and other communication related information. The communication systems exchange one long information sequence including all the necessary communication information. Subsequently, the communication systems start transmitting short sequences, including an acknowledgement information portion. If one of the communication systems does not receive an acknowledgement within a predetermined time or event, that communication system may retransmit another long information sequence. After such retransmission, the retransmitting communication system may continue transmitting the long information sequences or may start transmitting the short sequences once again. Eventually, each of the communication systems should receive a long information sequence and acknowledge their receipt of such sequence.Type: GrantFiled: April 24, 2000Date of Patent: March 9, 2004Assignee: Conexant Systems, Inc.Inventor: Sverrir Olafsson
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Patent number: 6700974Abstract: An apparatus and method for providing a ringing voltage to a communication device such as a telephone or a modem. Typically, communication devices are coupled to a ringing voltage providing telephone network, such as a Plain Old Telephone Service (POTS) network. The POTS network generally provides the necessary ringing voltages to the communication device. However, in other telephone networks, such as a PBX system, ringing voltages are not provided by the telephone network. The apparatus provides ringing voltages to the communication devices coupled to the non-ringing voltage providing telephone networks. The apparatus includes a switching regulator that provides the necessary ringing voltages to an indicator such as a bell or other output indicator.Type: GrantFiled: September 16, 1999Date of Patent: March 2, 2004Assignee: Conexant Systems, Inc.Inventor: H. Ross Williams
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Patent number: 6693998Abstract: The startup, retrain, renegotiation quick connect or other processes of handshaking between communication systems involve the exchange of certain modulation, constellation, precoder, prefilter and other communication related information. The communication systems exchange one long information sequence including all the necessary communication information. Subsequently, the communication systems start transmitting short sequences, including an acknowledgement information portion. If one of the communication systems does not receive an acknowledgement within a predetermined time or event, that communication system may retransmit another long information sequence. After such retransmission, the retransmitting communication system may continue transmitting the long information sequences or may start transmitting the short sequences once again. Eventually, each of the communication systems should receive a long information sequence and acknowledge their receipt of such sequence.Type: GrantFiled: December 29, 2001Date of Patent: February 17, 2004Assignee: Conexant Systems, Inc.Inventor: Sverrir Olafsson
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Patent number: 6693961Abstract: Embodiments of the invention comprise a new device and method to realize an improved video frame memory reduction for a video decoder. In one embodiment, this improvement is achieved by a removal of the rate controller and the utilization of both a block compression technique and a fixed storage allocation technique, in order to lower the overall system cost, and to lower the frame memory requirements. In a preferred embodiment, this improvement is achieved by performing a hierarchical transform, for example, a Haar transform, that operates on the previously decoded frames. Then, the coefficients obtained from this transformation are quantized and then run-length coded, utilizing variable-length codes. The hierarchical transform preferably operates on an N×N block size with L levels of hierarchical decomposition, where N and L can be selected in advance. For example, in one preferred embodiment, N may equal 8, and L may equal 3.Type: GrantFiled: January 10, 2000Date of Patent: February 17, 2004Assignee: Conexant Systems, Inc.Inventor: Faramarz Azadegan
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Publication number: 20040031064Abstract: A cable television receiver includes in-band and out-of-band tuners integrated on a single IC. A mode controller determines whether an out-of-band signal is being received and powers the out-of-band tuner off when no out-of-band signal is present. A signal divider divides the signals between the in-band and out-of-band tuners and may be an asymmetric coupler in order to provide a higher power signal to the in-band tuner and a lower power signal to the out-of-band tuner.Type: ApplicationFiled: August 8, 2002Publication date: February 12, 2004Applicant: Conexant Systems, Inc.Inventors: Mats Lindstrom, Glenn W. Eswein, Abdolreza Shafie, Mike A. Ploof, Ryuji Maeda, Manjit S. Gill, Eileen Carlson, Anthony R. Simon
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Publication number: 20040031015Abstract: A system and method for manipulating software is provided. The system analyzes a body of source code and derives a set of components from the software architecture inherent in the body of source code. The system further determines the internal and external functional and data dependencies of each component and the control flow of the software and creates an information model that represents the components, their dependencies, and the control flow of the program. Additionally, the system provides a graphical interface that presents the information model and allows the macro and micro structure of the model to be viewed and modified. Furthermore, components can be combined and separated to refine the software architecture represented by the information model and documentation and new source code can be provided for inclusion in the information model.Type: ApplicationFiled: May 24, 2001Publication date: February 12, 2004Applicant: Conexant Systems, Inc.Inventors: Mohamed Ben-Romdhane, Harshal A. Mulherkar, Ramanand V. Mandayam