CN1061458C - 磁记录和重放装置 - Google Patents
磁记录和重放装置 Download PDFInfo
- Publication number
- CN1061458C CN1061458C CN94113531A CN94113531A CN1061458C CN 1061458 C CN1061458 C CN 1061458C CN 94113531 A CN94113531 A CN 94113531A CN 94113531 A CN94113531 A CN 94113531A CN 1061458 C CN1061458 C CN 1061458C
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- China
- Prior art keywords
- signal
- magnetic head
- mode
- switching signal
- spindle motor
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- Expired - Fee Related
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
- G11B15/125—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams conditioned by the operating function of the apparatus
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/1808—Driving of both record carrier and head
- G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
- G11B15/4673—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/54—Controlling, regulating, or indicating speed by stroboscope; by tachometer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Television Signal Processing For Recording (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
一种磁记录和重放装置具有:一主轴马达,一信号发生器,一主轴伺服电路;一***控制电路用于在静止模式或慢动作模式期间正常重放模式的指令信号输入时,根据预置标准重放模式或长时间重放模式产生与磁头输入切换信号同步的一预定加速控制信号,一磁头放大器;一主轴马达驱动电路;预放电路和一色度信号处理电路用于处理响应于旋转切换信号的色度信号。因此,提供了一种在模式变换期间没有噪声的高质量的磁记录和重放装置。
Description
本发明涉及一种磁记录和重放装置,尤其涉及一种用于减少在静止图象模式变换成正常重放模式时产生的噪声的磁记录和重放装置。
一般,磁记录/重放装置,例如,盒式磁带录象机具有特殊的重放功能和正常的重放功能。该正常的重放功能是控制主轴马达的速度,以致磁带能以用于记录相同的速度行进。因此,在正常重放模式时,旋转磁头沿(跟踪)磁带的磁迹扫描。而特殊的重放功能是控制主轴马达的速度,以致磁带能以与正常重放模式的正常磁带走行速度不同的速度通过旋转磁头,也就是说,以较快的速度(多速重放或高速搜索)、较慢速度(慢动作重放)或停止状态(静止图象重放)通过。因此,在特殊重放模式期间,旋转磁头横越磁带的轨迹。由于旋转磁头沿磁迹扫描,就能在正常重放模式重放图象时观看到没有噪声的清晰的图象。但是在特殊的重放模式期间,对应于旋转磁头交叉磁迹的横越数目产生噪声条纹。
为此,如果重放模式是从静止模式或慢动作模式变到正常重放模式,由于磁迹被旋转磁头横越直到主轴马达的速度返回到正常的重放模式速度,所以噪声条纹被连续不断地产生。也就是说,其存在的缺点在于:该噪声出现直到改变一模式之前正在操作的主轴马达的速度返回到正常速度为止。
因此,利用四磁头双方位方法的盒式磁带录象机,在标准时间重放模式或SP模式期间执行包络检波过程,在磁头变换部分仍产生开关噪声。可是在长期重放模式或LP模式期间不能进行该包络检波过程,也产生了噪声。然而由于这种噪声的产生降低了盒式磁带录象机的质量。
为了解决上述问题,本发明的目的在于提供一种当操作模式由特殊重放模式,诸如静止模式或慢动作模式变换到正常重放模式时减少产生的噪声的磁记录和重放装置。
为了实现上述的目的,根据本发明提供的一种磁记录和重放装置包括有:
一主轴马达,用于运行磁带;
一信号发生器,用于产生一主轴频率信号以检测主轴马达的旋转速度;
一主轴伺服电路装置,用于接收主轴频率信号和产生一主轴伺服控制信号及一磁头切换信号;
一***控制电路装置,用于在静止模式或慢动作模式期间正常重放模式的指令信号输入时,根据预置标准时间重放或长时间重放模式产生与磁头切换信号的输入同步的一预定加速控制信号、一磁头放大器切换信号和一旋转切换信号;
一主轴马达驱动电路装置,用于响应于通过加速控制信号与主轴伺服控制信号组合所获得的信号来驱动主轴马达;
一预放装置,用于通过选择磁头放大器放大由已选择磁头重放的信号,并响应于磁头切换信号和磁头放大器切换信号输出已放大的信号;和
一色度信号处理电路装置,用于处理响应于旋转切换信号的色度信号。
本发明的上述目的和优点通过结合附图详细描述优选实施例将变得显见,其中:
图1是根据本发明的一种磁记录和重放装置的方框图;和
图2A至2I是用于解释图1中每个部分操作的波形图。
图1所示的装置包括:一主轴马达16,用于通过旋转主轴12运转放置在压带轮14和主轴12之间的磁带10,一CFG信号发生器18,它与主轴马达16邻接,用于产生主轴频率信号S1以检测主轴马达的旋转速度,一主轴伺服电路20,用于接收主轴频率信号S1和产生主轴伺服控制信号S3及磁头切换信号S2,一***控制电路22,用于在静止模式或慢动作模式期间正常重放模式的指令信号输入时,根据预置标准时间重放或长期重放模式产生磁头切换信号S2的输入同步的一预定加速控制信号S4、一磁头放大器切换信号S5和一旋转切换信号S6,一主轴马达驱动电路24,用于响应于通过将加速脉冲S4与主轴伺服控制信号S3相组合所获得的信号S7驱动主轴马达,一预放电路26,用于通过选择磁头放大器放大已选择磁头的重放信号,并响应磁头切换信号S2和磁头放大器切换信号S5输出已放大的信号,和一色度信号处理电路28,用于处理响应于旋转切换信号S6的色度信号。标号30和32分别表示一旋转磁鼓和一磁头。
参照图2,下面将描述本发明的操作和效果。
图2A所示的磁头轨迹图表示磁头32通过磁带的轨迹。在磁带处在停止状态的静止模式期间,磁头以垂直于磁带的纵向的方向扫描。当正常重放模式期间,由于磁带按预定速度行进,所以磁头沿该轨迹扫描。如图2B所示的波形,如果在静止模式期间重放模式键输入送到***控制电路22,也就是说,如果正常重放模式被指定,在从图2C的波形中所示的磁头切换信号S2的下降沿通过的预定时间“a”(图2D)之后,产生一预定时间“b”的加速控制信号S4。加速控制信号S4通过反向电流保护二极管D1与从主轴伺服电路20输出的主轴伺服控制信号S3组合,以便加到主轴马达驱动电路24。在加速控制信号S4加到主轴马达驱动电路24之前,也就是说,当磁带处于停止状态时,不产生主轴频率信号S1。因此,由于不产生主轴伺服控制信号S3,主轴马达16仅受加速控制信号S4控制。在停止状态,主轴马达驱动电路24响应于加速控制信号S4的预定时间“b”加速主轴马达16,以致该磁带能从停止状态到正常重放模式的速度尽可能快地运行。CFG信号发生器18的主轴频率信号S1一般由加速控制部分“b”的结束点产生。在这种情况,主轴伺服部分20接收主轴频率信号S1,然后伺服控制该磁带以正常重放模式运行。如图2A所示,在变换模式后,磁头沿磁迹扫描有较短的延迟,由此减少了由横跨磁迹产生的噪声。并且,***控制电路22确定一给定的重放模式是否在标准时间模式或长期模式,并相应于给定模式(图2F-2I)产生磁头放大器切换信号S5和旋转切换信号S6。也就是说,在标准时间模式期间,当输入重放键输入时,与第二磁头切换信号S2的下降沿同步产生具有磁头切换信号S2同相的旋转切换信号S6,如图2G所示。在长时间模式期间,以同样的方法产生具有磁头切换信号S2反相的旋转切换信号S6,如图2I所示。另一方面,在静止模式的标准时间模式期间,所产生的磁头放大器切换信号S5与磁头切换信号S2反相,如图2F所示,在长时间模式期间,所产生的磁头放大器切换信号S5与磁头切换信号S2同相,然后在正常重放模式期间,不产生磁头放大器切换信号S5,与各模式无关。
如上所述,当静止模式变换成正常重放模式时,也就是说,当模式变换指令输入时,根据本发明的一种磁记录和重放装置加速(促进)与磁头切换信号同步的主轴马达,并根据每个电路的模式变换产生切换信号,从而减少了由噪声条纹产生的和在切换变换中产生的噪声。
Claims (1)
1.一种磁记录和重放装置包括:
一主轴马达,用于运行磁带;
一信号发生器,用于产生一主轴频率信号以检测所述主轴马达的旋转速度;
一主轴伺服电路装置,用于接收所述主轴频率信号和产生一主轴伺服控制信号及一磁头切换信号;
一***控制电路装置,用于在静止模式或慢动作模式期间正常重放模式的指令信号输入时,根据预置标准重放模式或长时间重放模式产生与所述磁头切换信号的输入同步的一预定加速控制信号、一磁头放大器切换信号和一旋转切换信号;
一主轴马达驱动电路装置,用于响应于通过所述加速控制信号与所述主轴伺服控制信号的组合所获得的信号驱动主轴马达;
一预放装置,用于通过选择磁头放大器放大由已选择磁头重放的信号,并响应于所述磁头切换信号和所述磁头放大器切换信号输出所述已放大的信号;和
一色度信号处理电路装置,用于处理响应于所述旋转切换信号的色度信号。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930032292A KR0155755B1 (ko) | 1993-12-31 | 1993-12-31 | 자기기록/재생장치 |
KR32292/93 | 1993-12-31 | ||
KR32292/1993 | 1993-12-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1125346A CN1125346A (zh) | 1996-06-26 |
CN1061458C true CN1061458C (zh) | 2001-01-31 |
Family
ID=19375156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN94113531A Expired - Fee Related CN1061458C (zh) | 1993-12-31 | 1994-12-26 | 磁记录和重放装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US5715350A (zh) |
KR (1) | KR0155755B1 (zh) |
CN (1) | CN1061458C (zh) |
GB (1) | GB2285532B (zh) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2252430A (en) * | 1991-01-31 | 1992-08-05 | Samsung Electronics Co Ltd | Capstan motor controller |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56140541A (en) * | 1980-04-02 | 1981-11-02 | Matsushita Electric Ind Co Ltd | Magnetic tape driving device |
JPS5897737U (ja) * | 1981-12-22 | 1983-07-02 | 日本ビクター株式会社 | 磁気記録再生装置 |
JPS5924465A (ja) * | 1982-07-30 | 1984-02-08 | Hitachi Ltd | 磁気録画再生装置の可変速再生の制御装置 |
JP2619531B2 (ja) * | 1989-06-16 | 1997-06-11 | 株式会社日立製作所 | 情報記録再生装置 |
US5285329A (en) * | 1989-09-29 | 1994-02-08 | Canon Kabushiki Kaisha | Rotary head type recording apparatus |
US5327304A (en) * | 1990-09-12 | 1994-07-05 | Canon Kabushiki Kaisha | Tape drive controlling device |
-
1993
- 1993-12-31 KR KR1019930032292A patent/KR0155755B1/ko not_active IP Right Cessation
-
1994
- 1994-12-08 GB GB9425037A patent/GB2285532B/en not_active Expired - Fee Related
- 1994-12-26 CN CN94113531A patent/CN1061458C/zh not_active Expired - Fee Related
- 1994-12-30 US US08/366,912 patent/US5715350A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2252430A (en) * | 1991-01-31 | 1992-08-05 | Samsung Electronics Co Ltd | Capstan motor controller |
Also Published As
Publication number | Publication date |
---|---|
GB9425037D0 (en) | 1995-02-15 |
GB2285532A (en) | 1995-07-12 |
CN1125346A (zh) | 1996-06-26 |
US5715350A (en) | 1998-02-03 |
GB2285532B (en) | 1997-10-22 |
KR950020656A (ko) | 1995-07-24 |
KR0155755B1 (ko) | 1998-12-15 |
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