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    • 1. 发明授权
    • Device for encoding/decoding n-bit source words into corresponding m-bit channel words, and vice versa
    • 将n位源字编码/解码为相应的m位通道字的装置,反之亦然
    • US06275175B1
    • 2001-08-14
    • US09702914
    • 2000-10-27
    • Josephus A. H. M. KahlmanToshiyuki NakagawaYoshihide ShimpukuTatsuya NaraharaKousuke Nakamura
    • Josephus A. H. M. KahlmanToshiyuki NakagawaYoshihide ShimpukuTatsuya NaraharaKousuke Nakamura
    • H03M700
    • G11B20/1426H03M5/145
    • A device is disclosed for encoding a stream of databits of a binary source signal (S) into a stream of databits of a binary channel signal (C), wherein the bitstream of the source signal is divided into n-bit source words (x1, x2), which device comprises converting means (CM) adapted to convert said source words into corresponding m-bit channel words (y1, y2, y3). The converting means (CM) are further adapted to convert n-bit source words into corresponding m-bit channel words, such that the conversion for each n-bit source word is parity preserving (table I) (FIG. 1). The relations hold that m>n≧1, p≧1, and that p can vary. Preferably, m=n+1. The device is adapted to convert the 8-bit bit sequence ‘00010001’ in the source signal into the 12-bit bitsequence ‘100010010010’ and to convert the 8-bit bitsequence ‘10010001’ into the 12-bit bitsequence ‘000010010010’, in order to limit the repeated minimum transition runlength in the channel signal. Also other 8-bit sequences require a specific encoding into 12-bit bitsequences in order to limit the k-constraint of the channel signal to 7. Further, a decoding device is disclosed for decoding the channel signal obtained by means of the encoding device.
    • 公开了一种用于将二进制源信号(S)的数据位流编码成二进制信道信号(C)的数据位流的装置,其中源信号的比特流被划分为n位源字(x1, x2),该装置包括适于将所述源字转换成对应的m位通道字(y1,y2,y3)的转换装置(CM)。 转换装置(CM)还适于将n位源字转换成相应的m位通道字,使得每个n位源字的转换是奇偶校验(表1)(图1)。 关系认定m> n> = 1,p> = 1,p可以变化。 优选地,m = n + 1。该装置适于将源信号中的8位比特序列“00010001”转换为12比特比特序列“100010010010”,并将8比特比特序列“10010001”转换为12 比特序列“000010010010”,以便限制信道信号中重复的最小过渡游程长度。 而且其他8位序列还需要对12位比特序列进行特定编码,以将信道信号的k约束限制为7.此外,公开了一种解码装置,用于对通过编码装置获得的信道信号进行解码。
    • 3. 发明授权
    • Device for encoding/decoding n-bit source words into corresponding m-bit channel words, and vice versa
    • 将n位源字编码/解码为相应的m位通道字的装置,反之亦然
    • US06225921B1
    • 2001-05-01
    • US09177957
    • 1998-10-23
    • Josephus A. H. M. KahlmanKornelis A. Schouhamer ImminkGijsbert J. Van Den EndenToshiyuki NakagawaYoshihide ShimpukuTatsuya NaraharaKousuke Nakamura
    • Josephus A. H. M. KahlmanKornelis A. Schouhamer ImminkGijsbert J. Van Den EndenToshiyuki NakagawaYoshihide ShimpukuTatsuya NaraharaKousuke Nakamura
    • H03M500
    • G11B20/1426H03M5/145
    • A device is disclosed for encoding a stream of databits of a binary source signal (S) into a stream of databits of a binary channel signal (C) satisfying a (d,k) constraint, wherein the bitstream of the source signal is divided into n-bit source words (x1, x2), which device comprises converting means (CM) adapted to convert said source words into corresponding m-bit channel words (Y1, Y2, Y2). The converting means (CM) are further adapted to convert n-bit source words into corresponding m-bit channel words, such that the conversion for each n-bit source word is parity preserving (table I). The relations hold that m>n≧1, p≧1, and that p can vary. Preferably, m=n+1. Further, a sync word generator (9) is available for generating a q-bit sync word also satisfying said (d,k) constraint, the said sync word starting with a ‘0’ bit and ending with a ‘0’ bit, the device further comprising merging means (19) for merging said sync word in said stream of databits of the binary channel signal, and that q is an integer value larger than k. (FIG. 1) Further, a decoding device is disclosed for decoding the channel signal obtained by means of the encoding device.
    • 公开了一种用于将二进制源信号(S)的数据位流编码为满足(d,k)约束的二进制信道信号(C)的数据位流的装置,其中源信号的比特流被分为 n位源字(x1,x2),该装置包括适于将所述源字转换成对应的m位通道字(Y1,Y2,Y2)的转换装置(CM)。 转换装置(CM)还适于将n位源字转换成相应的m位通道字,使得每个n位源字的转换是奇偶校验(表I)。 关系认定m> n> = 1,p> = 1,p可以变化。 优选地,m = n + 1。 此外,同步字生成器(9)可用于生成也满足所述(d,k)约束的q位同步字,所述同步字以“0”位开始并以“0”位结束, 装置还包括用于在所述二进制信道信号的所述数据位流中合并所述同步字,并且所述q是大于k的整数值的合并装置(19)。 (图1)此外,公开了一种解码装置,用于对通过编码装置获得的信道信号进行解码。
    • 9. 发明授权
    • Visible light communication transmitter and visible light communication system
    • 可见光通信发射机和可见光通信系统
    • US08526825B2
    • 2013-09-03
    • US13059397
    • 2009-09-25
    • Masashi YamadaKousuke Nakamura
    • Masashi YamadaKousuke Nakamura
    • H04B10/00
    • H04B10/116H01L33/50
    • 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.
    • 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。