公开(公告)号：US3689903A

公开(公告)日：1972-09-05

申请号：US3689903D

申请日：1970-10-16

Applicant: HONEYWELL INC

Inventor： AGRAWALA ASHOK K ,  DIXON SAMUEL J ,  SOLLMAN GEORGE H

IPC: G11B20/14 ,  H03L7/091 ,  G11B5/44

CPC classification number: H03L7/091 ,  G11B20/1403

Abstract: A voltage controlled oscillator output frequency is constrained to follow the highest component of significant transitions in an input signal by allowing the input signal to change oscillatorcontrolling voltages only within a predetermined period after receipt of an input signal transition. The output frequency is maintained at its last corrected value between periods of change. The oscillator forms part of a phase lock loop for establishing a clock to recover variable frequency recorded information.

Abstract translation: 通过允许输入信号仅在接收到输入信号转换之后的预定时段内改变振荡器控制电压，受压控振荡器输出频率被限制为跟随输入信号中的重要转变的最高分量。 输出频率在变化期间保持在其最后的校正值。 振荡器构成锁相环的一部分，用于建立时钟以恢复可变频率记录的信息。

公开(公告)号：US3685033A

公开(公告)日：1972-08-15

申请号：US3685033D

申请日：1970-08-24

Applicant: HONEYWELL INC

Inventor： SRIVASTAVA KESHAVA ,  AGRAWALA ASHOK K

IPC: G11B20/14 ,  G11B5/06 ,  H03K13/258 ,  H04L3/02

CPC classification number: G11B20/1426

Abstract: This specification discloses a high density recording and reproducing system wherein the effective packing density is increased by a generalized code which increases the number of bits per transition on the recording medium. The data is encoded in blocks so that n bits of information are transmitted with an allowed (2n-1) bits so that the total number of reversals in the recording medium is a minimum.

Abstract translation: 本说明书公开了一种高密度记录和再现系统，其中通过增加记录介质上的每个转变位的数量的广义代码来增加有效的堆积密度。 数据以块为单位进行编码，使得以允许的（2n-1）比特发送n个比特的信息，使得记录介质中的反转总数最小。