公开(公告)号：US06678011B2

公开(公告)日：2004-01-13

申请号：US09842557

申请日：2001-04-26

申请人： Shigeto Yanagi ,  Toshiyuki Nagano ,  Hiromichi Sano ,  Takayuki Kaida

发明人： Shigeto Yanagi ,  Toshiyuki Nagano ,  Hiromichi Sano ,  Takayuki Kaida

IPC分类号： H04N544

CPC分类号： H04N5/60 ,  H04N5/4446 ,  H04N5/455 ,  H04N5/52 ,  H04N21/4263 ,  H04N21/43632

摘要： A band-pass filter separates an audio intermediate frequency signal from an input intermediate frequency signal, and an A/D converter circuit converts the audio intermediate frequency signal into a digital signal. A DSP performs audio detection on the digital signal and forms an AGC signal based on the signal. A variable gain amplifier performs AGC on the audio intermediate frequency signal in response to the AGC signal. A bandpass filter separates and takes out a video intermediate frequency signal from the signal, and an A/D converter circuit converts the video intermediate frequency signal into a digital signal. A DSP performs video detection on the signal. An AGC signal is formed based on the signals and AGC is performed on the video intermediate frequency signals by using the AGC signal.

摘要翻译： 带通滤波器将音频中频信号与输入中频信号分离，并且A / D转换器电路将音频中频信号转换为数字信号。 DSP对数字信号执行音频检测，并根据信号形成AGC信号。 可变增益放大器响应于AGC信号对音频中频信号执行AGC。 带通滤波器从信号中分离并取出视频中频信号，A / D转换电路将视频中频信号转换为数字信号。 DSP对信号执行视频检测。 基于该信号形成AGC信号，并且通过使用AGC信号对视频中频信号执行AGC。

公开(公告)号：US06542561B1

公开(公告)日：2003-04-01

申请号：US09234258

申请日：1999-01-20

申请人： Shigeto Yanagi

发明人： Shigeto Yanagi

IPC分类号： H03K900

CPC分类号： H01Q1/1257 ,  H04L25/03044 ,  H04L25/0305 ,  H04L27/06 ,  H04L2025/03382 ,  H04L2025/03547 ,  H04L2025/03808 ,  H04N5/211

摘要： The present invention discloses a device and method for eliminating an interfering wave and determining the best orientation for an antenna. A SAW (surface acoustic wave) filter employed in the invention eliminates an interfering wave (a ground analog broadcasting wave) and extracts a video-signal element of a specified channel (a bandwidth of 6 MHz) from an input intermediate-frequency signal so as to output to an A/D converter. The arrangement of the filter, which is a band pass filter having a comb-shaped attenuation characteristic, is such that the first peak of attenuation is made to coincide with the peak of an interfering signal; the A/D converter produces an AGC feedback signal to output to a high-frequency amplifier, an intermediate-frequency amplifier, and an operation unit, respectively; a waveform equalization unit eliminates a ghost image generated due to multi-path interference from the input signal by using an equalizing method such as a learning equalization, a blind equalization, etc., to output to an error correction unit and, also, to output a filter tap coefficient used for the equalization to the operation unit; and, then, the error correction unit corrects an error of the input signal by using a Read-Solomon code and a Trellis code to output to a demultiplexer and, also, to output the error-rate information of the input signal to the operation unit.

摘要翻译： 本发明公开了一种用于消除干扰波并确定天线最佳取向的装置和方法。 本发明中使用的SAW（表面声波）滤波器消除干扰波（地面模拟广播波），并从输入的中频信号中提取指定信道（带宽为6MHz）的视频信号元素，以便 输出到A / D转换器。 作为具有梳状衰减特性的带通滤波器的滤波器的布置使得使第一衰减峰值与干扰信号的峰值一致; A / D转换器产生AGC反馈信号以分别输出到高频放大器，中频放大器和操作单元; 波形均衡单元通过使用诸如学习均衡，盲均衡等的均衡方法来消除由于来自输入信号的多径干扰而产生的重影，以输出到纠错单元，并且还输出 用于对操作单元进行均衡的滤波器抽头系数; 然后，纠错单元通过使用Read-Solomon码和网格码来校正输入信号的错误，以输出到解复用器，并且还将输入信号的错误率信息输出到操作单元 。

公开(公告)号：US5737283A

公开(公告)日：1998-04-07

申请号：US629444

申请日：1996-04-09

申请人： Itaru Sato ,  Shigeto Yanagi ,  Susumu Matsunaga

发明人： Itaru Sato ,  Shigeto Yanagi ,  Susumu Matsunaga

IPC分类号： G11B19/247 ,  G11B7/085 ,  G11B21/08 ,  G11B27/10 ,  G11B27/30 ,  G11B17/22

CPC分类号： G11B21/083 ,  G11B27/105 ,  G11B27/3036 ,  G11B27/3063 ,  G11B7/08505

摘要： An apparatus for reproducing information from a disc-shaped record medium, which comprises an optical reading head for reading a program information signal and absolute time data from an optical disc, a reading position driving portion for moving a reading position set by the optical reading head on the optical disc, an information reproducing portion for obtaining a reproduced program information signal and reproduced absolute time data based on outputs from the optical reading head, a memory portion for storing the reproduced absolute time data, a reference time data supplying portion for supplying reference time data corresponding to the absolute time data, a data comparing portion for comparing the reproduced absolute time data read from the memory portion with the reference time data supplied from the reference time data supplying portion, a control signal producing portion for forming a reading position control signal in response to a comparison output from the data comparing portion, and a reading position control portion for controlling in response to the reading position control signal the reading position driving portion so as to cause the reading position set by the optical reading head on the optical disc to reach a position corresponding to the reference time data.

摘要翻译： 一种用于从盘形记录介质再现信息的装置，包括用于从光盘读取节目信息信号和绝对时间数据的光学读取头，用于移动由光学读取头设置的读取位置的读取位置驱动部分 在光盘上的信息再现部分，用于根据来自光学读取头的输出获得再现的节目信息信号和再现的绝对时间数据，用于存储再现的绝对时间数据的存储部分，用于提供参考的基准时间数据提供部分 对应于绝对时间数据的时间数据;数据比较部分，用于将从存储器部分读取的再现绝对时间数据与从基准时间数据提供部分提供的基准时间数据进行比较;控制信号产生部分，用于形成读取位置控制 响应于来自数据比较输出的比较输出的信号 以及读取位置控制部分，用于响应于读取位置控制信号控制读取位置驱动部分，以使由光学读取头设置的读取位置到达与基准时间数据相对应的位置 。