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公开(公告)号：US11255708B2
公开(公告)日：2022-02-22
申请号：US17008156
申请日：2020-08-31
发明人： Anand Dabak , Venkata Ramanan
摘要： A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.
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公开(公告)号：US11005530B2
公开(公告)日：2021-05-11
申请号：US16744376
申请日：2020-01-16
发明人： Badri N Varadarajan , Anand Dabak , Il Han Kim
摘要： In a disclosed embodiment, a power line communication (PLC) transmitter includes a forward error correction (FEC) encoder that receives payload data and adds parity information to the data to create an encoded output, a fragmenter that receives the encoded output from the FEC encoder and segments the encoded output into a plurality of fragments, a fragment repetition encoder that receives the plurality of fragments from the fragmenter and copies each of the fragments a selected number of times, and an interleaver that receives the copies of the plurality of fragments from the fragment repetition encoder and interleaves the copies of the plurality of fragments for transmission on a power line.
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公开(公告)号：US10541727B2
公开(公告)日：2020-01-21
申请号：US16200928
申请日：2018-11-27
发明人： Badri N Varadarajan , Anand Dabak , Il Han Kim
摘要： In a disclosed embodiment, a power line communication (PLC) transmitter includes a forward error correction (FEC) encoder that receives payload data and adds parity information to the data to create an encoded output, a fragmenter that receives the encoded output from the FEC encoder and segments the encoded output into a plurality of fragments, a fragment repetition encoder that receives the plurality of fragments from the fragmenter and copies each of the fragments a selected number of times, and an interleaver that receives the copies of the plurality of fragments from the fragment repetition encoder and interleaves the copies of the plurality of fragments for transmission on a power line.
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公开(公告)号：US20180274957A1
公开(公告)日：2018-09-27
申请号：US15708553
申请日：2017-09-19
CPC分类号： G01F1/667 , G01F1/662 , G01F1/668 , G01F15/024 , H04B11/00
摘要： Disclosed examples include methods and systems to measure fluid flow, including a transmit circuit to provide a transducer transmit signal based on a transmit pulse signal, a receive circuit to receive a transducer receive signal, an ADC to sample a receive signal from the receive circuit and provide a sampled signal, and a processing circuit that computes a transit time based on the sampled signal, and provides the transmit pulse signal including a first portion with a frequency in a first frequency band, and a second portion with a second frequency outside the first frequency band to mitigate undesired transducer vibration, where the second frequency is outside a transducer frequency bandwidth of the transducer.
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公开(公告)号：US20170207820A1
公开(公告)日：2017-07-20
申请号：US15476587
申请日：2017-03-31
发明人： Badri N Varadarajan , Anand Dabak , II Han Kim
CPC分类号： H04B3/54 , H04L1/0041 , H04L1/0071 , H04L69/22 , H04L69/323
摘要： In a disclosed embodiment, a power line communication (PLC) transmitter includes a forward error correction (FEC) encoder that receives payload data and adds parity information to the data to create an encoded output, a fragmenter that receives the encoded output from the FEC encoder and segments the encoded output into a plurality of fragments, a fragment repetition encoder that receives the plurality of fragments from the fragmenter and copies each of the fragments a selected number of times, and an interleaver that receives the copies of the plurality of fragments from the fragment repetition encoder and interleaves the copies of the plurality of fragments for transmission on a power line.
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6.发明申请Ultrasonic Transducer System and Method Using Selective Interleaved Excitation Pulse Frequency 审中-公开超声波传感器系统及使用选择性交错激励脉冲频率的方法公开(公告)号：US20160080093A1
公开(公告)日：2016-03-17
申请号：US14852005
申请日：2015-09-11
IPC分类号： H04B11/00
摘要： A transducer system with a transducer and circuitry for applying a pulse train to excite the transducer. The circuitry for applying a pulse train selects a first set having a first number of pulses at a first frequency and a second set of pulses having a second number of pulses at a second frequency differing from the first frequency. At least one pulse from the first set is located in the pulse train between one or more of the pulses at the second frequency.
摘要翻译： 具有换能器和电路的换能器系统，用于施加脉冲串来激励换能器。 用于施加脉冲串的电路选择具有第一频率的第一脉冲数的第一组和具有与第一频率不同的第二频率的第二脉冲数的第二组脉冲。 来自第一组的至少一个脉冲位于第二频率的一个或多个脉冲之间的脉冲串中。
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公开(公告)号：US20150355001A1
公开(公告)日：2015-12-10
申请号：US14300303
申请日：2014-06-10
发明人： Anand Dabak , Venkata Ramanan
摘要： A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.
摘要翻译： 公开了一种计算时差的方法。 该方法包括对第一超声波信号（r21）采样以产生第一采样信号（y1（i）），并对第二超声波信号（r12）进行采样以产生第二采样信号（y2（i））。 在第一采样信号跨越阈值（＆amp; t; 1）的时间与第二采样信号越过阈值的时间之间确定第一时间（LEAD_LAG）。 第一采样信号与第二采样信号交叉相关以产生第二时间（SAMP_OFFSET）。 响应于第一次和第二次计算时间差。
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公开(公告)号：US20140303910A1
公开(公告)日：2014-10-09
申请号：US14156388
申请日：2014-01-15
发明人： Anand Dabak , Venkata Ramanan
摘要： 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.
摘要翻译： 公开了一种计算时差的方法。 该方法包括从第一换能器（UT1）接收第一超声波信号（r21）并从第二超声换能器（UT2）接收第二超声波信号（r12）。 第一和第二超声波信号被采样以产生相应的第一和第二采样超声波信号（502）。 从第一和第二采样超声波信号（510）中选择具有大于第一阈值的值的点。 响应于所选择的点计算第一和第二超声波信号之间的行进时间差异（512）。
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公开(公告)号：US20130294531A1
公开(公告)日：2013-11-07
申请号：US13659870
申请日：2012-10-24
发明人： Ramanuja Vedantham , Anand Dabak , Tarkesh Pande
IPC分类号： H04B3/54
CPC分类号： H04B3/54 , H04B3/546 , H04B2203/5408 , H04B2203/5433 , H04B2203/5445 , H04L5/14
摘要： 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.
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10.发明申请公开(公告)号：US20130101055A1
公开(公告)日：2013-04-25
申请号：US13656694
申请日：2012-10-20
IPC分类号： H04B3/54
CPC分类号： H04B3/54 , H04B2203/5416 , H04L5/0094 , H04L27/04 , H04L27/18 , H04L27/2602 , H04L27/32
摘要： Systems and methods for routing protocols for power line communications (PLC) are described. In some embodiments, a method performed by a PLC device, such as a PLC meter, may include selecting one or more transmit sub-bands on which to transmit frames, where the transmit sub-bands comprise groups of six carrier frequencies. The PLC device then generates a frame comprising a tone map that indicates which transmit sub-bands are used to carry data for the frame. The tone map using two bits per transmit sub-band to indicate a status of each transmit sub-band. The PLC device then transmits the frame on the selected transmit sub-bands using OFDM. A resolution bit and a mode bit may be used to provide additional information about the transmit sub-bands, such as an amount of power adjustment that has been applied to carrier frequencies and whether dummy bits are transmitted on unused carrier frequencies.
摘要翻译： 描述了用于电力线通信（PLC）的路由协议的系统和方法。 在一些实施例中，由诸如PLC计量器之类的PLC设备执行的方法可以包括选择一个或多个在其上发射帧的发射子带，其中发射子带包括六个载波频率的组。 然后，PLC设备生成包括音调映射的帧，该音调映射指示哪些发送子带被用于携带用于该帧的数据。 每个发送子带使用两位的色调映射表示每个发送子带的状态。 然后，PLC设备使用OFDM在所选择的发送子带上发送帧。 可以使用分辨率位和模式位来提供关于发射子带的附加信息，例如已经应用于载波频率的功率调整量以及在未使用的载波频率上是否发送虚拟位。
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