Patents by Inventor Anand Dabak
Anand Dabak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20140338467Abstract: A multi-channel flow sensing system typically includes first and second flow-sensing transducers arranged in each channel. A data acquisition system is coupled to the first and second transducers of each of the channels. The data acquisition system is arranged to transmit and/or receive a sensing signal from at least one of the first and second transducers of each of the channels. The received sensing signals are sequentially converted and accumulated as data for billing in accordance with the measured flow within each channel. Using common components within the data acquisition system for measuring the various channels reduces costs and increases affordability in cost-sensitive areas.Type: ApplicationFiled: May 15, 2013Publication date: November 20, 2014Inventors: Ravindra Karnad, Venkata Ramanan Ramamurthy, Anand Dabak, Venu Gopinathan
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Publication number: 20140305215Abstract: A flow meter ultrasonically measures fluid velocity in a pipe and ultrasonically transmits fluid flow data along the pipe. An ultrasonic transducer used for fluid velocity measurement may optionally also be used for communication of flow data, and optionally, the ultrasonic frequency for fluid velocity measurement may be the same as the ultrasonic frequency for communication of flow data.Type: ApplicationFiled: April 10, 2013Publication date: October 16, 2014Applicant: Texas Instruments IncorporatedInventors: Anand Dabak, Clive Bittlestone
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Publication number: 20140303910Abstract: A method of calculating a time difference is disclosed. The method includes receiving a first ultrasonic signal (r21) from a first transducer (UT1) and receiving a second ultrasonic signal (r12) from a second ultrasonic transducer (UT2). The first and second ultrasonic signals are sampled to produce respective first and second sampled ultrasonic signals (502). Points having a value greater than a first threshold are selected from the first and second sampled ultrasonic signals (510). A difference in travel time between the first and second ultrasonic signals is calculated (512) in response to the selected points.Type: ApplicationFiled: January 15, 2014Publication date: October 9, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Anand Dabak, Venkata Ramanan
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Patent number: 8831077Abstract: Systems and methods are disclosed for communicating on a pilot wire between Electric Vehicle Service Equipment (EVSE) and an Electric Vehicle (EV). The EVSE and EV exchange a Pulse Width Modulation (PWM) signal on the pilot wire to control charging operations of the EV. Data communications may also be transmitted on the pilot wire, such as between transmit and receive modems. The modems transmit communication signals either continuously, without regard to the state of the PWM signal, or only when the PWM is in an off-state. If transmitting while PWM is on, the modem needs a large coupling impedance and/or a large signal injection. To transmit only when the PWM is off, the modem may use a blocking diode in the coupling circuit or may synchronize to the pulses in the PWM signal.Type: GrantFiled: June 17, 2011Date of Patent: September 9, 2014Assignee: Texas Instruments IncorporatedInventors: Badri Varadarajan, Il Han Kim, Anand Dabak, Edward Mullins
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Publication number: 20140107950Abstract: A method of calculating a time difference is disclosed. The method includes receiving a first ultrasonic signal (r21) having a first frequency from a first transducer (UT2) at a first time and receiving a second ultrasonic signal (r12) having the first frequency from a second ultrasonic transducer (UT2) at a second time. The first ultrasonic signal and the second ultrasonic signal are sampled at a second frequency (302). The first sampled ultrasonic frequency is interpolated (306). The difference in travel time between the first and second ultrasonic signals is calculated in response to the interpolated first sampled ultrasonic signal and the sampled second ultrasonic signal (equation [43]).Type: ApplicationFiled: October 11, 2013Publication date: April 17, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Anand Dabak, Venkata Ramanan
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Publication number: 20140055413Abstract: A touch screen system includes a capacitive touch screen (1) including a plurality of row conductors (7-1, 2 . . . n) and a column conductor (5-1). A plurality of cotemporaneous orthogonal excitation signals (S1(t), S2 (t) . . . Sn(t)) are simultaneously driven onto the row conductors, respectively. The capacitively coupled signals on the column conductor may be influenced by a touch (10) on the capacitive touch screen. Receiver circuitry (50) includes a sense amplifier (21-1) coupled to generate an amplifier output signal (r1(t)) in response to signals capacitively coupled onto the column conductor. WHT-based circuitry (35) determines amounts of signal contribution capacitively coupled by each of the excitation signals, respectively, to the amplifier output signal.Type: ApplicationFiled: November 5, 2013Publication date: February 27, 2014Applicant: Texas Instruments IncorporatedInventors: William R. Krenik, Anand Dabak
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Patent number: 8649443Abstract: A device for communicating digital data over power lines includes a power line interface for transmitting data over at least one band of frequencies. An orthogonal frequency division multiplexing (OFDM) modulation unit generates OFDM symbols using a set of tones for the frequency band. A preamble generation unit generates preamble sequences for the frequency band by using the set of tones used by the OFDM modulation unit. The tones used by the preamble generation unit have a constant magnitude, and a set of phases obtained by quantizing to a small alphabet the phase of a set of tones obtained by taking an IFFT of a portion of a preamble used by a non-interoperable powerline access device. The device may transmit on two or more bands using a sampling frequency clock, wherein a lower band clock frequency is equal to or an integer divisor of a higher band clock frequency.Type: GrantFiled: April 27, 2010Date of Patent: February 11, 2014Assignee: Texas Instruments IncorporatedInventors: Badri Varadarajan, Anand Dabak, Shu Du, Il Han Kim
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Publication number: 20140012518Abstract: A flow meter ultrasonically measures fluid velocity in a pipe. Ultrasonic signals received by ultrasonic transducers are digitized. The difference between two ultrasonic propagation times is determined by computing a discrete cross-correlation of the digitized received signals. Computation time is reduced by computing only a few cross-correlation values near a peak cross-correlation value.Type: ApplicationFiled: June 27, 2013Publication date: January 9, 2014Inventors: Venkata Ramanan Ramamurthy, Anand Dabak
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Patent number: 8625689Abstract: Embodiments of the invention provide time-domain link adaptation in power line communications. In one embodiment, the cyclic prefix length and position is adjusted with an OFDM symbol to overlap a periodic impulse noise pulse, thereby allowing the data carried in the symbol to be detected at a receiver. The cyclic prefix may be adjusted to provide a pattern that yields an integer number of OFDM symbols in one zero crossing period. The data rate used for the symbols overlapping the zero-crossing period may be zero or very low. A high data rate may be used for symbols outside the zero-crossing period because those symbols will not be affected by the periodic impulse noise.Type: GrantFiled: July 8, 2011Date of Patent: January 7, 2014Assignee: Texas Instruments IncorporatedInventors: Badri Varadarajan, Anand Dabak, Il Han Kim
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Patent number: 8605054Abstract: A touch screen system includes a capacitive touch screen (1) including a plurality of row conductors (7-1,2 . . . n) and a column conductor (5-1). A plurality of cotemporaneous orthogonal excitation signals (S1(t), S2(t) . . . Sn(t)) are simultaneously driven onto the row conductors, respectively. The capacitively coupled signals on the column conductor may be influenced by a touch (10) on the capacitive touch screen. Receiver circuitry (50) includes a sense amplifier (21-1) coupled to generate an amplifier output signal (r1(t)) in response to signals capacitively coupled onto the column conductor. WHT-based circuitry (35) determines amounts of signal contribution capacitively coupled by each of the excitation signals, respectively, to the amplifier output signal.Type: GrantFiled: September 2, 2010Date of Patent: December 10, 2013Assignee: Texas Instruments IncorporatedInventors: William R. Krenik, Anand Dabak
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Publication number: 20130294531Abstract: Systems and methods for enabling co-existence among power line communications (PLC) technologies are described. In some embodiments, a method performed by a PLC device, such as a PLC gateway, may include detecting a communication from foreign PLC device on a PLC network in response to a foreign preamble received by the PLC device, terminating transmissions to the PLC network for a network-specific co-existence Extended Interframe Space (cEIFS) time period in response to the foreign preamble, and resuming transmissions to the PLC network after expiration of the network-specific time period.Type: ApplicationFiled: October 24, 2012Publication date: November 7, 2013Inventors: Ramanuja Vedantham, Anand Dabak, Tarkesh Pande
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Publication number: 20130070781Abstract: Method and apparatus for communicating via a network. In one embodiment, a device for communicating via a network includes a medium access controller (MAC). The MAC is configured to apply a contention window for collision avoidance on the network, and to determine whether the network is free for use on expiration of a time value of the contention window. The MAC is also configured to initiate a transmission based on a determination that the network is free for use. The MAC is further configured to increase, in accordance with a predetermined probability value, the time value of the contention window based on: the transmission being successful; and the time value of the contention window being a minimum contention window time value. The probability value establishes the likelihood of the MAC increasing the time value of the contention window with respect to successful transmissions with the minimum contention window time value.Type: ApplicationFiled: September 11, 2012Publication date: March 21, 2013Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Ramanuja VEDANTHAM, Kumaran VIJAYASANKAR, Tarkesh PANDE, Anand DABAK
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Publication number: 20130070790Abstract: A method for multi-tone mask communication including generating, by a power line communication router, a superframe to include a plurality of beacons corresponding to a plurality of tone masks. Each beacon also defining a plurality of tone masks, a contention access region, a contention free period, an inter router communication slot. The superframe also includes at least one of the beacons also defining an idle time during which nodes receiving the superframe are to transition to a low power mode. Transmitting the superframe to a power line communication node.Type: ApplicationFiled: September 17, 2012Publication date: March 21, 2013Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Ramanuja VEDANTHAM, Kumaran VIJAYASANKAR, Anand DABAK
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Publication number: 20120257639Abstract: Systems and methods for designing, using, and/or implementing communications in beacon-enabled networks are described. In various implementations, these systems and methods may be applicable to power line communications (PLC). For example, a method may include identifying one of a plurality of orthogonal superframes. The identified superframe may include beacon slots and contention access period (CAP) slots. The beacon slots may follow a sequence of two or more frequency subbands, and the CAP slots may follow the same sequence of two or more frequency subbands. Also, the sequence of two or more frequency subbands may be distinct from other sequences of two or more frequency subbands followed by other beacon slots and CAP slots within others of the plurality of available superframes. The method may then include communicating with another device using the identified superframe.Type: ApplicationFiled: March 30, 2012Publication date: October 11, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Kumaran Vijayasankar, Shu Du, Anand Dabak, Badri Varadarajan, Il Han Kim, Xiaolin Lu
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Publication number: 20120237036Abstract: A method of communicating scrambling seed information includes obtaining raw data to be transmitted using a processor, and generating scrambled data from the raw data according to a scrambling seed. A scrambled data packet structure is configured by combining a preamble portion, a synch portion, and a header portion to the scrambled data, wherein the header portion includes a scrambler field value including a plurality of bits (M). The scrambled data packet structure is transmitted to a receiver. The receiver receives the header portion including the scrambler field value. The receiver maps the scrambler field value to a scrambling seed, and decodes the scrambled data using the scrambling seed.Type: ApplicationFiled: February 27, 2012Publication date: September 20, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: ANAND DABAK, JEAN PICARD
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Patent number: 8259598Abstract: Apparatus and method for accessing a wireless telecommunications network by transmitting a random access signal. The random access signal includes a cyclic prefix signal and a guard interval. The cyclic prefix signal and the guard interval are adapted to optimize random access channel coverage in a telecommunications cell. The disclosed method for transmitting a random access signal includes transmitting a cyclic prefix signal. The duration of the cyclic prefix signal is approximately the sum of a maximum round trip delay duration of the telecommunications cell and a maximum delay spread duration. The method further includes providing a guard interval. The guard interval duration being approximately the duration of the maximum round trip delay of the telecommunications cell.Type: GrantFiled: August 3, 2007Date of Patent: September 4, 2012Assignee: Texas Instruments IncorporatedInventors: Pierre Bertrand, Anand Dabak, Jing Jiang
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Publication number: 20120195246Abstract: Embodiments of the invention provide methods for maximizing the bandwidth utilization in the uplink of a communication system supporting time division multiplexing between unicast and multicast/broadcast communication modes during transmission time intervals in the downlink of a communication system. This is accomplished by multiplexing at least unicast control signaling for UL scheduling assignments in TTIs supporting the multicast/broadcast communication mode. Moreover, multiplexing of unicast control signaling can also be accomplished by splitting a symbol of the multicast/broadcast TTI into two shorter symbols with the first of these two shorter symbols carrying at least unicast control signaling and the second of these shorter symbols carrying multicast/broadcast signaling.Type: ApplicationFiled: April 13, 2012Publication date: August 2, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Aris Papasakellariou, Timothy M. Schmidl, Eko N. Onggosanusi, Anand Dabak
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Patent number: 8175021Abstract: Embodiments of the invention provide methods for maximizing the bandwidth utilization in the uplink of a communication system supporting time division multiplexing between unicast and multicast/broadcast communication modes during transmission time intervals in the downlink of a communication system. This is accomplished by multiplexing at least unicast control signaling for UL scheduling assignments in TTIs supporting the multicast/broadcast communication mode. Moreover, multiplexing of unicast control signaling can also be accomplished by splitting a symbol of the multicast/broadcast TTI into two shorter symbols with the first of these two shorter symbols carrying at least unicast control signaling and the second of these shorter symbols carrying multicast/broadcast signaling.Type: GrantFiled: October 31, 2006Date of Patent: May 8, 2012Assignee: Texas Instruments IncorporatedInventors: Aris Papasakellariou, Timothy M Schmidl, Eko N. Onggosanusi, Anand Dabak
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Publication number: 20120082253Abstract: A system and method for communicating in a power line communications (PLC) network using Orthogonal Frequency-Division Multiplexing (OFDM) symbols. Pilot tones are carried by the OFDM symbols according to a predetermined pattern. A receiving device identifies pilot tones on each frequency. A group of previously received pilot tones on a selected frequency are filtered to generate a channel estimate for a tone on the selected frequency in a new symbol. The channel estimates on two different frequencies within an OFDM symbol may be interpolated to determine a channel estimate for a third frequency with the OFDM symbol.Type: ApplicationFiled: July 1, 2011Publication date: April 5, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Badri Varadarajan, Anand Dabak, Il Han Kim, Akula Aneesh Reddy
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Patent number: RE45299Abstract: A receiver in an OFDM based communication system is adapted to perform channel estimation using a received reference signal transmitted from at least one antenna The reference signal is substantially located into at least two OFDM symbols of a transmission time interval comprising of more than two OFDM symbols. A power level of said reference signal is divided into said non-consecutive OFDM symbols in said transmission time interval and adapted to use the reference signal located in a first OFDM symbol in succeeding transmission time intervals in addition to the reference symbols in a current transmission time interval and a preceding transmission time interval.Type: GrantFiled: April 19, 2013Date of Patent: December 23, 2014Assignee: Texas Instruments IncorporatedInventors: Aris Papasakellariou, Timothy M. Schmidl, Eko N Onggosanusi, Anand Dabak