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1. 发明申请

US20180109403A1 Energy efficient highway addressable remote transducer C8PSK modem 审中-公开
公开(公告)号：US20180109403A1
公开(公告)日：2018-04-19
申请号：US15294680
申请日：2016-10-15
申请人： Pranatharthi Subbaratnam Haran
发明人： Pranatharthi Subbaratnam Haran
IPC分类号： H04L27/10 , H04L27/18 , H04L27/22 , H04L1/20 , H04L27/01
CPC分类号： H04L1/206 , H04L27/20
摘要： A method and a Highway Addressable Remote Transducer (HART) soft modem device (SMD) for transmitting a C8PSK signal and receiving and demodulating an Analog signal in either FSK or C8PSK comprising a HART message is provided. A transmitter of HART-SMD improves efficiency by reducing the computation complexity with a novel table lookup technique. A demodulator of the HART-SMD receives the Analog signal, samples and converts the Analog signal into digital data at a predetermined digital sample rate. The demodulator implements a two-step phase estimation technique followed by a single step timing estimate to achieve an optimal operating region for the receiver so that the receiver can be ready to receive state in a very short time as required in C8PSK specifications. A simple method of doing automatic modulation classification by negating the presence of an FSK modulation by the positive assertion of the presence of C8PSK modulation, or by the absence of C8PSK Signal and the presence of Energy detect to assert the presence of FSK signal is also stated.

2. 发明申请

US20160056985A1 ENERGY EFFICIENT HIGHWAY ADDRESSABLE REMOTE TRANSDUCER SOFT MODEM 有权
标题翻译：高能效的高速可寻址远程传感器软件调制解调器
公开(公告)号：US20160056985A1
公开(公告)日：2016-02-25
申请号：US14872145
申请日：2015-10-01
申请人： Smart Embedded Systems Inc.
发明人： Pranatharthi Subbaratnam Haran
IPC分类号： H04L27/227 , H04B3/04
CPC分类号： H04L27/2275 , H04B3/04 , H04L7/0087 , H04L25/40 , H04L27/12 , H04L27/14
摘要： A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits analog signals with HART messages, and a phase coherent FSK demodulator receives and demodulates the analog signals with the HART messages. The FSK modulator is a digital modulator that outputs 1 or 0 for transmission. With oversampling and low pass filtering, the digital modulation results in low jitter and good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access (DMA) to further reduce the power consumption, thereby reducing the overall power consumption by around 50%.
摘要翻译：提供了一种用于使用HART消息调制和解调模拟信号的方法和高速公路可寻址远程传感器（HART）软调制解调器装置。相位相移频移键控（FSK）调制器用HART消息调制和传输模拟信号，相位相干FSK解调器用HART消息接收和解调模拟信号。 FSK调制器是一个数字调制器，输出1或0进行传输。采用过采样和低通滤波，数字调制产生低抖动和良好的信噪比。 FSK解调器采用快速能量检测算法，动态地降低或增加HART软调制解调器设备的中央处理器（CPU）的时钟速度，以降低CPU的功耗。此外，HART软调制解调器设备使用直接存储器访问（DMA）来进一步降低功耗，从而将总体功耗降低了约50％。

3. 发明授权

US10153928B2 Energy efficient highway addressable remote transducer coherent 8-ary phase shift keying modem 有权
公开(公告)号：US10153928B2
公开(公告)日：2018-12-11
申请号：US15905786
申请日：2018-02-26
申请人： Smart Embedded Systems, Inc.
发明人： Pranatharthi Subbaratnam Haran
IPC分类号： H04L27/10 , H04L27/20
摘要： A method and a highway addressable remote transducer (HART) modem for modulating and demodulating an analog signal including a HART message are provided. With low power consumption, the less computationally intensive HART modem modulates the analog signal using a coherent 8-ary phase shift keying (C8PSK) technique with a predefined gray code lookup table and a pre-generated sample lookup table having phase modulated digital signals indexed by index vectors, and transmits a HART C8PSK analog signal to sensor devices. A C8PSK demodulator in the HART modem demodulates the HART C8PSK analog signal by performing coarse estimation and fine estimation of phase errors and by estimation of a timing offset using a decision estimator. An automatic modulation classifier of the C8PSK demodulator validates presence of the analog signal in a C8PSK protocol by determining signs of in-phase and quadrature phase signals corresponding to each subsequent processed digitized sample of the analog signal.

4. 发明授权

US09203665B1 Resource optimization by implementing multiple instances of a soft modem with a single microcontroller 有权
标题翻译：通过使用单个微控制器实现软调制解调器的多个实例来进行资源优化
公开(公告)号：US09203665B1
公开(公告)日：2015-12-01
申请号：US14714376
申请日：2015-05-18
申请人： Smart Embedded Systems, Inc.
发明人： Pranatharthi Subbaratnam Haran
IPC分类号： H04B1/38 , H04L27/12 , H04L25/40
CPC分类号： H04L27/122 , H04B3/04 , H04L25/40 , H04L27/12 , H04L27/14
摘要： A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating one or more analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits the analog signals, and a phase coherent FSK demodulator receives and demodulates the analog signals. The FSK modulator outputs 1 or 0 for transmission. With oversampling and low pass filtering, digital modulation performed by the FSK modulator results in low jitter and a good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access and runs multiple instances of a HART soft modem integrated within a microcontroller to reduce an overall power consumption.
摘要翻译：提供了一种用于使用HART消息调制和解调一个或多个模拟信号的方法和高速公路可寻址的远程传感器（HART）软调制解调器装置。相位相移频移键控（FSK）调制器调制和传输模拟信号，相位相干FSK解调器接收和解调模拟信号。 FSK调制器输出1或0进行传输。通过过采样和低通滤波，FSK调制器执行的数字调制可以实现低抖动和良好的信噪比。 FSK解调器采用快速能量检测算法，动态地降低或增加HART软调制解调器设备的中央处理器（CPU）的时钟速度，以降低CPU的功耗。此外，HART软调制解调器设备使用直接存储器访问，并且运行集成在微控制器内的HART软调制解调器的多个实例以降低整体功耗。

5. 发明授权

US09281978B1 Energy efficient highway addressable remote transducer soft modem 有权
公开(公告)号：US09281978B1
公开(公告)日：2016-03-08
申请号：US14872145
申请日：2015-10-01
申请人： Smart Embedded Systems Inc.
发明人： Pranatharthi Subbaratnam Haran
IPC分类号： H04B1/38 , H04L5/16 , H04L27/227 , H04B3/04
CPC分类号： H04L27/2275 , H04B3/04 , H04L7/0087 , H04L25/40 , H04L27/12 , H04L27/14
摘要： A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits analog signals with HART messages, and a phase coherent FSK demodulator receives and demodulates the analog signals with the HART messages. The FSK modulator is a digital modulator that outputs 1 or 0 for transmission. With oversampling and low pass filtering, the digital modulation results in low jitter and good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access (DMA) to further reduce the power consumption, thereby reducing the overall power consumption by around 50%.

6. 发明授权

US09184965B1 Energy efficient highway addressable remote transducer soft modem 有权
公开(公告)号：US09184965B1
公开(公告)日：2015-11-10
申请号：US14791481
申请日：2015-07-06
申请人： Smart Embedded Systems Inc.
发明人： Pranatharthi Subbaratnam Haran
IPC分类号： H04B1/38 , H04L5/16 , H04L27/227 , H04B3/04 , H04L7/00
CPC分类号： H04L27/2275 , H04B3/04 , H04L7/0087 , H04L25/40 , H04L27/12 , H04L27/14
摘要： A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits analog signals with HART messages, and a phase coherent FSK demodulator receives and demodulates the analog signals with the HART messages. The FSK modulator is a digital modulator that outputs 1 or 0 for transmission. With oversampling and low pass filtering, the digital modulation results in low jitter and good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access (DMA) to further reduce the power consumption, thereby reducing the overall power consumption by around 50%.

7. 发明授权

US09106488B1 Energy efficient highway addressable remote transducer soft modem 有权
标题翻译：节能高速公路可寻址遥控器软调制解调器
公开(公告)号：US09106488B1
公开(公告)日：2015-08-11
申请号：US14466970
申请日：2014-08-23
申请人： Smart Embedded Systems Inc.
发明人： Pranatharthi Subbaratnam Haran
IPC分类号： H04B1/38 , H04L5/16 , H04L27/12 , H04L25/40
CPC分类号： H04L27/2275 , H04B3/04 , H04L7/0087 , H04L25/40 , H04L27/12 , H04L27/14
摘要： A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits analog signals with HART messages, and a phase coherent FSK demodulator receives and demodulates the analog signals with the HART messages. The FSK modulator is a digital modulator that outputs 1 or 0 for transmission. With oversampling and low pass filtering, the digital modulation results in low jitter and good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access (DMA) to further reduce the power consumption, thereby reducing the overall power consumption by around 50%.
摘要翻译：提供了一种用于使用HART消息调制和解调模拟信号的方法和高速公路可寻址远程传感器（HART）软调制解调器装置。相位相移频移键控（FSK）调制器用HART消息调制和传输模拟信号，相位相干FSK解调器用HART消息接收和解调模拟信号。 FSK调制器是一个数字调制器，输出1或0进行传输。采用过采样和低通滤波，数字调制产生低抖动和良好的信噪比。 FSK解调器采用快速能量检测算法，动态地降低或增加HART软调制解调器设备的中央处理器（CPU）的时钟速度，以降低CPU的功耗。此外，HART软调制解调器设备使用直接存储器访问（DMA）来进一步降低功耗，从而将总体功耗降低了约50％。

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