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    • 53. 发明申请
    • OFDM RECEIVING APPARATUS AND OFDM RECEIVING METHOD
    • OFDM接收设备和OFDM接收方法
    • US20090044074A1
    • 2009-02-12
    • US12185470
    • 2008-08-04
    • Kenichi TOKOROTakashi Seki
    • Kenichi TOKOROTakashi Seki
    • G11C29/00G06F11/00
    • H04L1/0045H04L1/0054H04L1/0056H04L27/2647
    • An OFDM receiving apparatus has N sets of reception and demodulation units which input one segment broadcasting signals of ground digital broadcasting received with N sets of antennas and demodulate the signals; a buffer unit which includes N sets of buffers which hold temporarily N sets of demodulated data, which are demodulated in the N sets of reception and demodulation units, respectively, and reads the N sets of demodulated data, which are written in the N sets of buffers, in time division; and an error correction unit which inputs N sets of demodulated data read from the buffer unit in time division, performs error correction one by one, and in the process of the error correction, multiplexes the N sets of demodulated data, which have been error-corrected, in a period not used by one segment reception to output the data as one TS multiplex data.
    • OFDM接收装置具有N组接收和解调单元,其输入用N组天线接收的地面数字广播的一个段广播信号,并解调该信号; 一个缓冲单元,包括N组缓冲器,它们分别保存在N组接收和解调单元中解调的N组解调数据,并读取N组解调数据,这些N组解调数据写入N组 缓冲区,分时; 以及错误校正单元,其以时分方式输入从缓冲器单元读取的N组解调数据,逐个进行纠错,并且在纠错处理中,复用已经出错的N组解调数据, 在一段接收中未使用的时段中将该数据作为一个TS多路复用数据输出。
    • 57. 发明授权
    • Automatic gain control method and its system
    • 自动增益控制方法及其系统
    • US06771719B1
    • 2004-08-03
    • US09510236
    • 2000-02-22
    • Takeshi KoyamaTakashi SekiNoboru Taga
    • Takeshi KoyamaTakashi SekiNoboru Taga
    • H04L2708
    • H03G3/3068
    • The automatic gain control method with little being influenced of the unnecessary electric wave, even if strong unnecessary electric wave is near the frequency of input signal, is offered by carrying out change of the delay point level. The automatic gain control system with a scale of few circuit, having low noise property and high adjacent disturbance oppression property, is offered. When the IF AGC signal 112 is smaller than delay point level, the output agcerr of the signal level detector 614 is provided to the 1st loop filter 105. Since the IF AGC signal 112 provided to the IF AGC amplifier 608 is value responding to signal level of IF signal, output is fed back to this amplifier, and control of IF gain is performed automatically. On the other hand, when output of the 2nd loop filter 106 is “0”, output rfzero of the 2nd comparator 108 is set to 1, and “0” is provided to the 2nd loop filter 106. When the output of the 2nd loop filter 106 is not “0”, it is set to “0”, fixed value-rfdump is provided to the 2nd loop filter 106, and the output of the 2nd comparator 108 is converged when output of this loop filter became “0.” For this reason, the RFAGC signal 113 provided to the RF AGC amplifier 602 is set to “0”, and gain of the RF AGC amplifier 602 is fixed to maximum value.
    • 即使强制不必要的电波接近输入信号的频率,也不受不必要的电波影响的自动增益控制方式是通过延迟点电平的变化来提供的。自动增益控制系统的尺寸为 提供具有低噪声特性和高相邻扰动压迫特性的电路,当IF AGC信号112小于延迟点电平时,信号电平检测器614的输出agcerr被提供给第一环路滤波器105.由于 提供给IF AGC放大器608的IF AGC信号112是响应于IF信号的信号电平的值,输出被反馈到该放大器,并且自动执行IF增益的控制。另一方面,当输出第二环路滤波器 106是“0”时,第二比较器108的输出rfzero被设置为1,并且向第二环路滤波器106提供“0”。当第二环路滤波器106的输出不是“0”时,它被设置为 “0”,固定值-rfdump 被提供给第二环路滤波器106,并且当该环路滤波器的输出变为“0”时,第二比较器108的输出被会聚。因此,提供给RF AGC放大器602的RFAGC信号113被设置为“0 “,并且RF AGC放大器602的增益被固定为最大值。