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    • 11. 发明授权
    • Bit-rate-independent optical receiver
    • 比特率独立光接收机
    • US06931210B2
    • 2005-08-16
    • US09946211
    • 2001-09-05
    • Sang-Ho KimSeong-Taek HwangJun-Ho KohYun-Je Oh
    • Sang-Ho KimSeong-Taek HwangJun-Ho KohYun-Je Oh
    • H04B10/40H04B10/07H04B10/50H04B10/60H04B10/66H04L7/02H04B10/00H04B10/08H04B10/12H04B10/16H04B10/20
    • H04B10/6932
    • Disclosed is a bit-rate-independent optical receiver including: a bit rate sensing unit for optoelectrically converting an input optical signal, while outputting a bit rate sensing signal; a variation sensing unit for outputting a bit rate variation sensing signal; a temperature sensing unit for sensing an internal temperature and outputting a temperature sensing signal; a signal reproducing unit for reproducing data and clocks, and in response to a clock correction signal, reproducing the data and clocks based on the clock correction signal; and, a control unit for calculating the bit rate based on the voltage level of the bit rate sensing signal in response to receiving the variation sensing signal, and compensating the calculated bit rate for errors resulting from a variation in temperature, and outputting a clock correction signal indicative of the temperature-compensated bit rate to the signal reproducing unit.
    • 公开了一种比特率独立的光接收机,包括:比特率感测单元,用于在输出比特率感测信号的同时对输入的光信号进行光电转换; 用于输出比特率变化感测信号的变化感测单元; 温度感测单元,用于感测内部温度并输出温度感测信号; 信号再现单元,用于再现数据和时钟,并响应于时钟校正信号,基于时钟校正信号再现数据和时钟; 以及控制单元,用于响应于接收到变化感测信号而基于比特率感测信号的电压电平计算比特率,并且补偿由于温度变化导致的错误的计算比特率,并输出时钟校正 指示信号再现单元的温度补偿比特率的信号。
    • 13. 发明授权
    • Bi-directional optical add/drop multiplexer for WDM optical networks
    • 用于WDM光网络的双向光分插复用器
    • US07277639B2
    • 2007-10-02
    • US10754030
    • 2004-01-08
    • Jong-Kwon KimKi-Cheol LeeSeong-Taek HwangJun-Ho Koh
    • Jong-Kwon KimKi-Cheol LeeSeong-Taek HwangJun-Ho Koh
    • H04J14/02
    • H04J14/0213H04J14/0212H04J14/0216
    • Disclosed is a bi-directional optical add/drop multiplexer connected to an optical fiber for transmitting optical signals multiplexed in a wavelength division multiplexing optical network and which performs adding/dropping of the optical signals. The optical add/drop multiplexer includes a first wavelength division multiplexer provided with a multiplexing port functioning as a path for forward or backward optical signals and with a plurality of demultiplexing ports, each functioning as a path of demultiplexed channels. A plurality of add/drop parts, each performing adding/dropping of preset channels, and connected with the demultiplexing ports of the first wavelength division multiplexer in one-to-one. A second wavelength division multiplexer connected with the plurality of add/drop parts in one-to-one, provided with a plurality of demultiplexing ports, each functioning as a path for demultiplexed channels and with a multiplexing port functioning as a path for forward or backward optical signals. The first wavelength division multiplexer has a free spectral range equal to that of the second wavelength division multiplexer, in which a wavelength band of the forward optical signals is included in the free spectral range having one period, while a wavelength band of the backward optical signals is included in the free spectral range having another period.
    • 公开了一种连接到光纤的双向光分插复用器,用于传输在波分复用光网络中复用的光信号,并执行光信号的加/减。 光分插复用器包括:第一波分多路复用器,其配置有用作前向或后向光信号的路径的多路复用端口,以及多个解复用端口,每个用作解复用信道的路径。 多个加/减部分,各自执行预设通道的添加/删除,并且与第一波分多路复用器的解复用端口一一对应连接。 一个第二波分多路复用器与一对一的多个加/减部分连接,设置有多个解复用端口,每个解复用端口用作解复用信道的路径,并且具有用作前向或后向路径的复用端口 光信号。 第一波分复用器具有等于第二波分复用器的自由频谱范围,其中正向光信号的波段包括在具有一个周期的自由频谱范围内,而反向光信号的波段 被包括在具有另一个周期的自由光谱范围内。
    • 14. 发明授权
    • Self-healing apparatus and method of optical receiver
    • US07039327B2
    • 2006-05-02
    • US09945895
    • 2001-09-04
    • Sang-Ho KimYun-Je OhSeong-Taek HwangJun-Ho Koh
    • Sang-Ho KimYun-Je OhSeong-Taek HwangJun-Ho Koh
    • H04B10/00H04B10/06H03K11/00H04L25/60H04L25/64
    • H04B10/6932H04Q11/0003H04Q2011/0043H04Q2011/0049
    • Disclosed is a self-healing apparatus and method of an optical receiver that is capable of avoiding error due to temperature variation in the optical receiver when determining the bit rate. The apparatus includes an optoelectric converting unit for converting an input optical signal into an electrical signal; an amplifying unit for amplifying the electrical signal outputted from the optoelectric converting unit; a bit rate discriminating unit for exclusively OR'ing the electrical signal with a delay signal that is delayed from the amplified receiving signal by a predetermined time, thereby outputting a recognition signal; a clock/data reproducing unit for receiving the electrical signal, and for reproducing clocks and data based on a reference clock; a bit rate signal generating unit for generating the reference clock in response to a bit rate change signal; a temperature sensing unit for outputting a temperature sensing signal that is indicative of the internal temperature of the optical receiver; and, a control unit for determining the bit rate of the receiving signal based on a value selected from temperature-dependent voltage level variation values that are previously stored, on the basis of the voltage level of the recognition signal outputted from the bit rate discriminating unit and the internal temperature of the optical receiver corresponding to the temperature sensing signal, and for outputting the bit rate change signal based on the determined bit rate.
    • 19. 发明申请
    • ENCODER, DECODER, ENCODING METHOD, AND DECODING METHOD
    • 编码器,解码器,编码方法和解码方法
    • US20100290484A1
    • 2010-11-18
    • US12782520
    • 2010-05-18
    • Hee-Won JUNGSeung-Gun ParkGi-Sang LeeJun-Ho KohSang-Mook LeeSergey Zhidkov
    • Hee-Won JUNGSeung-Gun ParkGi-Sang LeeJun-Ho KohSang-Mook LeeSergey Zhidkov
    • H04J3/24
    • H04J3/04H03M13/09H03M13/096H03M13/15H03M13/27H03M13/2936H03M13/2957H03M13/6356H04J3/24H04L1/0041H04L1/007
    • An encoder includes a precoder for encoding an input information object according to a preset encoding scheme and storing the encoded information object in a precoder buffer, a sample number/address generation unit for generating a sample number of each sample and an address, which corresponds to each bit of each sample and the address of the precoder buffer, a multiplexer for selecting a bit of the precoder buffer corresponding to the address generated by the sample number/address generation module, a sampling buffer for storing a bit of each sample output from the multiplexer, a control packet generation module for generating a control packet including information on the sample number generated by the sample number/address generation module, a packet assembling unit for assembling the sample stored in the sampling buffer with the control packet generated by the control data generation module, and a modulation module for modulating the packet output from the packet assembling unit into a sound signal according to a preset scheme.
    • 编码器包括:预编码器,用于根据预设的编码方案对输入信息对象进行编码,并将编码的信息对象存储在预编码器缓冲器中;样本编号/地址生成单元,用于生成每个样本的样本数和地址, 每个样本的每个位和预编码器缓冲器的地址,用于选择与由样本号/地址生成模块生成的地址相对应的预编码器缓冲器的位的多路复用器,用于存储来自 多路复用器,用于生成包括由样本号/地址生成模块生成的样本号的信息的控制分组的控制分组生成模块,用于将存储在采样缓冲器中的样本与由控制数据生成的控制分组合的分组组合单元 生成模块,以及用于调制从分组组装单元int输出的分组的调制模块 o根据预设方案的声音信号。
    • 20. 发明授权
    • MPEG-2 decoding system and method
    • MPEG-2解码系统及方法
    • US07400652B2
    • 2008-07-15
    • US10861205
    • 2004-06-04
    • Kwan-Lae KimSung-Jin ParkJun-Ho KohYoung-Seok KimYun-Je Oh
    • Kwan-Lae KimSung-Jin ParkJun-Ho KohYoung-Seok KimYun-Je Oh
    • H04H20/28H04H11/02
    • H04N21/4383H04N5/4401H04N21/4334H04N21/434H04N21/4345H04N21/4384
    • In an MPEG-2 decoding system, a transport decoder decodes a transport packet corresponding to a Program Identification (PID) from an input transport stream, and retrieves a Program Association Table/Program Map Table PAT/PMT) from the stream when it is requested to retrieve Program Specific lnformation (PSI). A pre-decoder checks PSI stored in a PSI memory in response to a request to change to a desired channnel, reads PIDs of transport packets for a Packetized Elementary Stream (PES) of a program corresponding to the desired channel from the PSI memory to provide it to the transport decoder, receives the PAT/PMT and updates the contents of the memory using the PAT/PMT. After decoding, PSI previously extracted therefrom is stored in the memory. PIDs of transport packets for the PES of desired program are obtained referring to the stored PSI, and transport packets having the PIDs are retrieved and decoded.
    • 在MPEG-2解码系统中,传输解码器从输入传输流解码对应于节目识别(PID)的传输分组,并且在请求时从流中检索节目关联表/节目映射表PAT / PMT) 检索程序特定信息(PSI)。 响应于要改变到所需信道的请求,预解码器检查存储在PSI存储器中的PSI,从PSI存储器读取对应于期望信道的节目的分组化基本流(PES)的传输分组的PID,以提供 它到传输解码器,接收PAT / PMT,并使用PAT / PMT更新存储器的内容。 在解码之后,先前提取的PSI被存储在存储器中。 通过存储的PSI获得所需节目的PES的传输分组的PID,并且检索并解码具有PID的传输分组。