公开(公告)号：US4866691A

公开(公告)日：1989-09-12

申请号：US166938

申请日：1988-03-11

申请人： Fumihiko Yokogawa

发明人： Fumihiko Yokogawa

IPC分类号： G11B7/005 ,  G11B7/13 ,  G11B20/10 ,  H03K5/08 ,  H03K5/1534

CPC分类号： H03K5/084 ,  G11B20/10009 ,  G11B7/005 ,  G11B7/13 ,  H03K5/1534

摘要： An RF signal processing circuit for processing an RF signal read from an optical disk or the like in which the entire dynamic range of an A/D converter circuit used to digitize the RF signal. An edge detector circuit detects the edges of the amplified RF signal, and a synchronizing signal detector detects a synchronizing signal in correspondence to the output of the edge detector. A timing signal is produced in correspondence to the output of the synchronizing signal detecting circuit. A clamping circuit clamps the input of the edge detector at a predetermined voltage in correspondence to the timing signal, whereby the input of the edge detector is clamped for at least a portion of the time period to the synchronizing signal.

摘要翻译： 一种用于处理从其中用于数字化RF信号的A / D转换器电路的整个动态范围的光盘等读取的RF信号的RF信号处理电路。 边缘检测器电路检测放大的RF信号的边缘，并且同步信号检测器检测与边缘检测器的输出相对应的同步信号。 对应于同步信号检测电路的输出产生定时信号。 钳位电路对应于定时信号将边缘检测器的输入钳位在预定电压下，从而将边缘检测器的输入钳位到同步信号的时间段的至少一部分。

公开(公告)号：US4473852A

公开(公告)日：1984-09-25

申请号：US412001

申请日：1982-08-27

申请人： Yasuo Kominami ,  Kazuo Watanabe ,  Fumihiko Yokogawa ,  Nobuhiro Suzuki

发明人： Yasuo Kominami ,  Kazuo Watanabe ,  Fumihiko Yokogawa ,  Nobuhiro Suzuki

IPC分类号： H04B1/62 ,  G11B20/04 ,  G11B20/24 ,  H03G9/02 ,  H04B1/64 ,  G11B5/47 ,  G11B5/02

CPC分类号： H03G9/025

摘要： Conventional Dolby B-type or C-type noise reduction systems respond sensitively to an A.C. bias signal during recording onto a magnetic tape. As a result, the system might exhibit a large encode error. In order to reduce such encode error, the gain - frequency characteristic control sensitivity of a side chain in the system to the A.C. bias signal to be supplied to a recording head is set at a value smaller than that of the gain - frequency characteristic control sensitivity of the side chain to an encode input signal at an audio frequency. Such a reduction of the encode error is achieved by connecting a bias trap circuit to a gain control amplifier included in the side chain.

摘要翻译： 传统的杜比B型或C型降噪系统在记录到磁带上时敏感地响应于A.C.偏差信号。 因此，系统可能会出现较大的编码错误。 为了减少这种编码误差，系统中侧链的增益 - 频率特性控制灵敏度被提供给记录头的AC偏置信号被设置为小于增益 - 频率特性控制灵敏度 的侧链到音频的编码输入信号。 通过将偏置捕获电路连接到侧链中包括的增益控制放大器来实现编码误差的这种减少。