公开(公告)号：EP0190695A3

公开(公告)日：1988-03-02

申请号：EP86101354

申请日：1986-02-03

Applicant: SONY CORPORATION

Inventor： Okada, Hiroshi ,  Takahashi, Takao ,  Inoue, Hajime

IPC: G11B05/008 ,  G11B20/10 ,  G11B05/024 ,  H04N05/92

CPC classification number: G11B5/0086 ,  G11B5/024 ,  G11B27/032 ,  G11B27/036 ,  G11B2220/90 ,  H04N5/78263

Abstract: In a tape recording apparatus having a rotary guide drum (5) on which a tape (2) is helically wrapped, a second erase head (1R) is secured on a rotary body included in the tape guide drum (5) for erasing recorded tracks (3) on the tape (2) when the tape (2) is driven in the reverse direction (4R) in addition to a first erase head (1F) secured on said rotary body (5) for erasing recorded tracks (3) on the tape (2) when the tape (2) is driven in the forward direction (4F), whereby the erasing and recording operations can be made both when the tape is moved in the forward direction (4F) and when it is moved in the reverse direction (4R).

公开(公告)号：WO1993026000A1

公开(公告)日：1993-12-23

申请号：PCT/US1993004776

申请日：1993-05-20

Applicant: TE ELECTRONICS INC.

Inventor： TE ELECTRONICS INC. ,  SANFORD, Robert ,  COOK, Robert ,  STUTEVILLE, Gerald

IPC: G11B05/024

CPC classification number: G11B5/024 ,  G11B5/03

Abstract: A circuit for generating a bias signal and an erase signal for use in a recording apparatus having a record head (10) for recording an input analog signal on a magnetic tape, and an erase head (24) for erasing information from the tape. A DC erase signal is applied to the erase head in response to the erase control signal to cause the erase head to erase information. An AC bias signal is generated (42) and is combined (20) with the input analog signal to make a record signal. The record signal is applied to the record head in response to the record control signal to record information on the tape. A controller generates an erase control signal and a record control signal. The AC bias signal is generated by an AC bias oscillator (42), such as a Hartley oscillator to reduce the noise contributed in the recording system. Use of a DC source (40) to drive the erase head reduces the cost of the circuit, while maintaining a significant increase in the signal-to-noise ratio.

Abstract translation: 一种用于产生偏置信号的电路和用于具有用于在磁带上记录输入模拟信号的记录头（10）的记录装置中使用的擦除信号，以及用于从磁带擦除信息的擦除头（24）。 响应于擦除控制信号将直流擦除信号施加到擦除头，以使擦除头擦除信息。 产生AC偏置信号（42）并将其与输入的模拟信号组合（20）以产生记录信号。 响应于记录控制信号将记录信号应用于记录头，以便在磁带上记录信息。 控制器产生擦除控制信号和记录控制信号。 AC偏置信号由诸如Hartley振荡器的AC偏置振荡器（42）产生，以减少记录系统中贡献的噪声。 使用直流电源（40）驱动擦除头可以降低电路的成本，同时保持信噪比的显着提高。

公开(公告)号：WO1998049674A1

公开(公告)日：1998-11-05

申请号：PCT/JP1997001512

申请日：1997-04-30

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION ,  TAMURA, Hitoshi ,  MORI, Hiroki

Inventor： INTERNATIONAL BUSINESS MACHINES CORPORATION

IPC: G11B05/024

CPC classification number: G11B5/4886 ,  G11B5/012 ,  G11B5/024 ,  G11B5/0245

Abstract: The information recorded on a disc in a magnetic disc apparatus regardless of the shape of a base is erased. A magnetic field is generated outside the magnetic disc apparatus and the magnetic disc apparatus is placed in the magnetic field to erase the information recorded on the disc in the magnetic disc apparatus.

Abstract translation: 无论基座的形状如何，记录在磁盘装置的盘上的信息被擦除。 在磁盘装置外部产生磁场，磁盘装置被放置在磁场中以擦除记录在磁盘装置中的盘上的信息。

公开(公告)号：WO1987001852A1

公开(公告)日：1987-03-26

申请号：PCT/US1986001810

申请日：1986-09-04

Applicant: EASTMAN KODAK COMPANY

Inventor： EASTMAN KODAK COMPANY ,  BISCHOFF, Gene, L. ,  ELLY, James, E.

IPC: G11B05/024

CPC classification number: G11B5/012 ,  G11B5/024

Abstract: A video signal recorded on a magnetic disk (10) is erased by applying a fixed frequency erasing signal from an oscillator (48) as the disk is decelerating. By recording the erasing signal while slowing the disk, an effect is obtained that is comparable to scanning through a range of increasing frequencies. The high frequencies obtained, which are ordinarily beyond the frequency response of the erasing circuit (30, 48), are effective in removing the resident video signal and in preparing the disk for a new recording.