公开(公告)号：US20120112046A1

公开(公告)日：2012-05-10

申请号：US13351478

申请日：2012-01-17

申请人： Kousuke Nakamura ,  Masashi Yamada

发明人： Kousuke Nakamura ,  Masashi Yamada

IPC分类号： H03F3/08

CPC分类号： H04B10/116 ,  H03F3/087

摘要： A visible light receiver circuit, which reduces the influence of ambient light, has a simple configuration, and generates low noise, is provided. The visible light receiver circuit includes a photoelectric conversion unit. The photoelectric conversion unit includes a photodiode having a cathode connected to a power source, a resistor connected in series to an anode of the photodiode, and a nonlinear resistive circuit connected in parallel to the resistor. The nonlinear resistive circuit includes, for example, a series circuit including a Zener diode and a resistor.

摘要翻译： 减少环境光的影响的可见光接收电路具有简单的结构，并且产生低噪声。 可见光接收电路包括光电转换单元。 光电转换单元包括具有连接到电源的阴极的光电二极管，与光电二极管的阳极串联连接的电阻器，以及与电阻器并联连接的非线性电阻电路。 非线性电阻电路包括例如包括齐纳二极管和电阻器的串联电路。

公开(公告)号：US08526825B2

公开(公告)日：2013-09-03

申请号：US13059397

申请日：2009-09-25

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/00

CPC分类号： H04B10/116 ,  H01L33/50

摘要： Visible light data communication with a sufficient transmission speed is performed using a general-purpose and cost-advantageous blue-light-excitation-type white LED without using a blue color filter while preventing the element from being damaged. When transmission data is inputted to a driving waveform generation unit (110) in a transmitter (100), the driving waveform generation unit (110) and a multi-gray scale driving unit (120) generate a multi-gray scale driving signal, which is supplied to the blue-light-excitation-type white LED (140) and allows the blue-light-excitation-type white LED (140) to emit light. A light signal outputted from the blue-light-excitation-type white LED (140) is collected by a lens or the like, is made incident into a PD (210) in a receiver (200), and is converted to a current signal. The current signal is converted into a voltage signal in a trans-impedance amplifier (212). Further, the light signal is subjected to equalization processing in an equalizer (214) and then is digitized by a limiting amplifier (216), thereby obtaining output data.

摘要翻译： 使用通用和成本优势的蓝光激发型白色LED，而不使用蓝色滤色器，同时防止元件被损坏，从而实现具有足够传输速度的可见光数据通信。 当传输数据被输入到发射机（100）中的驱动波形发生单元（110）时，驱动波形生成单元（110）和多灰阶驱动单元（120）产生多灰阶驱动信号， 被提供给蓝光激发型白光LED（140），并且允许蓝光激发型白光LED（140）发光。 由蓝光激发型白光LED（140）输出的光信号由透镜等收集入射到接收器（200）中的PD（210）中，并被转换为电流信号 。 电流信号被转换为跨阻放大器（212）中的电压信号。 此外，光信号在均衡器（214）中进行均衡处理，然后由限幅放大器（216）数字化，从而获得输出数据。

公开(公告)号：US20120257901A1

公开(公告)日：2012-10-11

申请号：US13528361

申请日：2012-06-20

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/10 ,  H04B10/04

CPC分类号： H04B10/116 ,  H04B10/114

摘要： Using a general-purpose cost-advantageous blue-light-excited-type white light emitting diode (LED), destruction of devices is prevented and visible light data communication is performed at a sufficient transmission rate. The blue-light-excited-type white LED is driven based on a driving current signal generated based on transmission data. While a visible light signal is outputted to a receiver, a multi-tone driving current signal is generated by a rising pulse and a falling pulse to a rising edge and a falling edge of the transmission data, respectively. Each of pulse widths of the rising pulse and the falling pulse is the same as a unit interval of the transmission data.

摘要翻译： 使用通用成本优势的蓝光激发型白光发光二极管（LED），防止了设备的破坏，并以足够的传输速率执行可见光数据通信。 基于基于传输数据生成的驱动电流信号来驱动蓝光激发型白光LED。 当可见光信号被输出到接收机时，分别通过上升脉冲和下降脉冲将多音调驱动电流信号产生到发送数据的上升沿和下降沿。 上升脉冲和下降脉冲的每个脉冲宽度与发送数据的单位间隔相同。

公开(公告)号：US20110164884A1

公开(公告)日：2011-07-07

申请号：US13059397

申请日：2009-09-25

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/02

CPC分类号： H04B10/116 ,  H01L33/50

摘要： Visible light data communication with a sufficient transmission speed is performed using a general-purpose and cost-advantageous blue-light-excitation-type white LED without using a blue color filter while preventing the element from being damaged. When transmission data is inputted to a driving waveform generation unit (110) in a transmitter (100), the driving waveform generation unit (110) and a multi-gray scale driving unit (120) generate a multi-gray scale driving signal, which is supplied to the blue-light-excitation-type white LED (140) and allows the blue-light-excitation-type white LED (140) to emit light. A light signal outputted from the blue-light-excitation-type white LED (140) is collected by a lens or the like, is made incident into a PD (210) in a receiver (200), and is converted to a current signal. The current signal is converted into a voltage signal in a trans-impedance amplifier (212). Further, the light signal is subjected to equalization processing in an equalizer (214) and then is digitized by a limiting amplifier (216), thereby obtaining output data.

摘要翻译： 使用通用和成本优势的蓝光激发型白色LED，而不使用蓝色滤色器，同时防止元件被损坏，从而实现具有足够传输速度的可见光数据通信。 当传输数据被输入到发射机（100）中的驱动波形发生单元（110）时，驱动波形生成单元（110）和多灰阶驱动单元（120）产生多灰度驱动信号， 被提供给蓝光激发型白光LED（140），并且允许蓝光激发型白光LED（140）发光。 从蓝光激发型白光LED（140）输出的光信号由透镜等收集入射到接收器（200）中的PD（210）中，并被转换成电流信号 。 电流信号被转换为跨阻放大器（212）中的电压信号。 此外，光信号在均衡器（214）中进行均衡处理，然后由限幅放大器（216）数字化，从而获得输出数据。

公开(公告)号：US20070031157A1

公开(公告)日：2007-02-08

申请号：US11499413

申请日：2006-08-04

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/04 ,  H04B10/12

CPC分类号： H04B10/1141 ,  H04B10/116

摘要： In one inventive aspect, a transmitter is provided. In the transmitter, a modulator supplies an electrical current based on a digital transmission electrical signal to a white LED, which emits light including a plurality of wavelengths into the air. A light detector separates a light signal component having a blue wavelength from the emitted light using an optical filter and converts the signal component to a monitoring electrical signal. A waveform control circuit outputs a control signal so that the time delay of the waveform of the monitoring signal with respect to the waveform of the transmission electrical signal is less than or equal to a predetermined value. The modulator corrects the amount of the electrical current supplied to the white LED on the basis of the control signal. In another inventive aspect, a receiver is provided. In the receiver, an optical filter separates a light signal component having a blue wavelength and a light detector detects substantially only the light signal component having a blue wavelength.

摘要翻译： 在一个发明方面，提供一种发射机。 在发射机中，调制器将基于数字传输电信号的电流提供给白光LED，该LED将多个波长的光发射到空气中。 光检测器使用滤光器将具有蓝色波长的光信号分量与发射光分离，并将该信号分量转换成监视电信号。 波形控制电路输出控制信号，使得监视信号的波形相对于发送电信号的波形的时间延迟小于或等于预定值。 调制器根据控制信号校正提供给白色LED的电流量。 在另一个发明方面，提供一种接收器。 在接收机中，光学滤波器分离具有蓝色波长的光信号分量，光检测器基本上仅检测具有蓝色波长的光信号分量。

公开(公告)号：US20120230703A1

公开(公告)日：2012-09-13

申请号：US13479992

申请日：2012-05-24

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/06

CPC分类号： H04B10/116 ,  H01L25/167 ,  H01L2924/0002 ,  H01L2924/00

摘要： A visible light communication receiver increases a communication distance from a transmitter to a receiver while realizing high transmission speed. The visible light communication receiver includes a receiving unit that receives a visible light signal from a blue light-excited white LED driven by a driving current signal generated by adding rising and falling pulses to respective rising and falling edges of a transmission data encoded according to a DC-free RLL code having a minimum run of 1 and NRZI-modulated prior to adding the rising and falling pulses; a photoelectric converter that converts the visible light signal into an electrical signal; an equalizer that equalizes the electrical signal to a duobinary signal; a discriminator that discriminates the duobinary signal to generate a 3-value signal; a maximum-likelihood decoder that ML-decodes the 3-value signal to output a decoded signal; and a decoder that RLL decodes the decoded signal.

摘要翻译： 可见光通信接收机在实现高传输速度的同时增加了从发射机到接收机的通信距离。 可见光通信接收机包括：接收单元，其接收来自蓝光激发的白光LED的可见光信号，所述可见光信号由驱动电流信号驱动，所述驱动电流信号是通过将上升和下降脉冲相加到根据 在添加上升和下降脉冲之前，具有最小运行1和NRZI调制的无DC RLL代码; 将可见光信号转换为电信号的光电转换器; 均衡器，其将电信号均衡为双二进制信号; 识别二进制信号以产生3值信号的鉴频器; 最大似然解码器，ML解码3值信号以输出解码信号; 以及RLL解码解码信号的解码器。

公开(公告)号：US20080212981A1

公开(公告)日：2008-09-04

申请号：US12039660

申请日：2008-02-28

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/06

CPC分类号： H04B10/116 ,  H04B10/1141

摘要： A data signal to be transmitted is supplied to a modulator of a transmitter, and the modulator modulates the output of a blue light-excited white LED and outputs blue LED light and phosphor light. The modulated blue light enters to a photo-electric converter through an LED light transmission color filter. The modulated phosphor light on the other hand enters to another photo-electric converter through a phosphor light transmission color filter. The photo-electric converters convert incident light to electric signals. The converted signals are amplified by amplifiers. Then, equalizers emphasize the harmonic component therein according to the response characteristic of the blue light and the response characteristic of the phosphor light for reduction of the dullness of waveforms.

摘要翻译： 要发送的数据信号被提供给发射机的调制器，并且调制器调制蓝光激发白光LED的输出并输出蓝色LED光和荧光体。 调制的蓝光通过LED光透射滤色器进入光电转换器。 另一方面，调制磷光体通过磷光体透射滤色器进入另一光电转换器。 光电转换器将入射光转换为电信号。 转换的信号由放大器放大。 然后，均衡器根据蓝光的响应特性和荧光灯的响应特性强调其中的谐波分量，以减少波形的钝度。

公开(公告)号：US08849127B2

公开(公告)日：2014-09-30

申请号：US13528361

申请日：2012-06-20

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/00 ,  H04B10/116 ,  H04B10/114

CPC分类号： H04B10/116 ,  H04B10/114

摘要： Using a general-purpose cost-advantageous blue-light-excited-type white light emitting diode (LED), destruction of devices is prevented and visible light data communication is performed at a sufficient transmission rate. The blue-light-excited-type white LED is driven based on a driving current signal generated based on transmission data. While a visible light signal is outputted to a receiver, a multi-tone driving current signal is generated by a rising pulse and a falling pulse to a rising edge and a falling edge of the transmission data, respectively. Each of pulse widths of the rising pulse and the falling pulse is the same as a unit interval of the transmission data.

摘要翻译： 使用通用成本优势的蓝光激发型白光发光二极管（LED），防止了设备的破坏，并以足够的传输速率执行可见光数据通信。 基于基于传输数据生成的驱动电流信号来驱动蓝光激发型白光LED。 当可见光信号被输出到接收机时，分别通过上升脉冲和下降脉冲将多音调驱动电流信号产生到发送数据的上升沿和下降沿。 上升脉冲和下降脉冲的每个脉冲宽度与发送数据的单位间隔相同。

公开(公告)号：US08750719B2

公开(公告)日：2014-06-10

申请号：US13479992

申请日：2012-05-24

申请人： Masashi Yamada ,  Kousuke Nakamura

发明人： Masashi Yamada ,  Kousuke Nakamura

IPC分类号： H04B10/00

CPC分类号： H04B10/116 ,  H01L25/167 ,  H01L2924/0002 ,  H01L2924/00

摘要： A visible light communication receiver increases a communication distance from a transmitter to a receiver while realizing high transmission speed. The visible light communication receiver includes a receiving unit that receives a visible light signal from a blue light-excited white LED driven by a driving current signal generated by adding rising and falling pulses to respective rising and falling edges of a transmission data encoded according to a DC-free RLL code having a minimum run of 1 and NRZI-modulated prior to adding the rising and falling pulses; a photoelectric converter that converts the visible light signal into an electrical signal; an equalizer that equalizes the electrical signal to a duobinary signal; a discriminator that discriminates the duobinary signal to generate a 3-value signal; a maximum-likelihood decoder that ML-decodes the 3-value signal to output a decoded signal; and a decoder that RLL decodes the decoded signal.

摘要翻译： 可见光通信接收机在实现高传输速度的同时增加了从发射机到接收机的通信距离。 可见光通信接收机包括：接收单元，其接收来自蓝光激发的白光LED的可见光信号，所述可见光信号由驱动电流信号驱动，所述驱动电流信号是通过将上升和下降脉冲相加到根据 在添加上升和下降脉冲之前，具有最小运行1和NRZI调制的无DC RLL代码; 将可见光信号转换为电信号的光电转换器; 均衡器，其将电信号均衡为双二进制信号; 识别二进制信号以产生3值信号的鉴频器; 最大似然解码器，ML解码3值信号以输出解码信号; 以及RLL解码解码信号的解码器。

公开(公告)号：US08742317B2

公开(公告)日：2014-06-03

申请号：US13351478

申请日：2012-01-17

申请人： Kousuke Nakamura ,  Masashi Yamada

发明人： Kousuke Nakamura ,  Masashi Yamada

IPC分类号： H01L31/00

CPC分类号： H04B10/116 ,  H03F3/087

摘要： A visible light receiver circuit, which reduces the influence of ambient light, has a simple configuration, and generates low noise, is provided. The visible light receiver circuit includes a photoelectric conversion unit. The photoelectric conversion unit includes a photodiode having a cathode connected to a power source, a resistor connected in series to an anode of the photodiode, and a nonlinear resistive circuit connected in parallel to the resistor. The nonlinear resistive circuit includes, for example, a series circuit including a Zener diode and a resistor.

摘要翻译： 减少环境光的影响的可见光接收电路具有简单的结构，并且产生低噪声。 可见光接收电路包括光电转换单元。 光电转换单元包括具有连接到电源的阴极的光电二极管，与光电二极管的阳极串联连接的电阻器，以及与电阻器并联连接的非线性电阻电路。 非线性电阻电路包括例如包括齐纳二极管和电阻器的串联电路。