公开(公告)号：EP0143654A3

公开(公告)日：1987-09-02

申请号：EP84308256

申请日：1984-11-28

Applicant: Matsushita Electric Industrial Co., Ltd.

Inventor： Tomita, Masao

IPC: G11B05/02 ,  G11B20/10 ,  G11B05/008 ,  H04N05/782

CPC classification number: G11B5/0086 ,  G11B5/02 ,  H04N5/78213 ,  H04N9/802

Abstract: A magnetic recording and reproducing method, applicable to a magnetic recording and reproducing apparatus such as a video tape recorder, comprises the steps of recording a first signal in a magnetic layer (6b) of a magnetic tape by a first head, recording a second signal which is preferably a digital signal in a shallower portion (6a) of the first signal recorded magnetic layer by a second head having a different azimuth from that of the first head. The width of the shallower portion (6a) is preferably narrower than the width of the first signal recorded magnetic layer. The recorded first and second signals are reproduced by heads having different azimuth from each other, respectively, so as not to interfere with each other.

公开(公告)号：EP0197560A3

公开(公告)日：1987-08-19

申请号：EP86104920

申请日：1986-04-10

Applicant: HITACHI, LTD.

Inventor： Okamoto, Hiroo ,  Kobayashi, Masaharu Hitachihachimanyama ,  Noguchi, Takaharu

IPC: G11B20/10 ,  G11B05/008

CPC classification number: G11B20/10527 ,  G11B20/1809

Abstract: When a PCM signal having a sampling frequency of 32 KHz, a quantization of 12 bits per sample, and 4 channel is to be recorded onto tape (33), the PCM signal undergoes, prior to being recorded onto the tape, such predetermined data dispersion that burst errors incurred in the reproduction operation may be compensated.

公开(公告)号：EP0125051A3

公开(公告)日：1985-12-18

申请号：EP84302505

申请日：1984-04-12

Applicant: VICTOR COMPANY OF JAPAN, LIMITED

Inventor： Koide, Hajime

IPC: G11B05/008 ,  H04N09/83 ,  G11B05/592 ,  G11B21/10 ,  G11B05/04 ,  G11B05/58 ,  G11B05/52 ,  H04N05/782

CPC classification number: H04N9/802 ,  G11B5/0086 ,  G11B5/5922 ,  G11B21/103 ,  H04N9/8355

Abstract: In a recording apparatus frequency modulators (25-28) a provided for modulating carriers having different frequencies with an information signal. The different frequency irriers are sequentially combined by a switch (12) and aplied to a recording head in response to the head being fifted from one track to the next to record each of the carriers a different track, so that there is a difference in frequency between carriers recorded on adjacent tracks. During play- back, the frequency-modulated carriers are sequentially produced and separated by band-pass filters (25-28) into individual carriers, frequency-demodulated respectively by (29-32) and sequentially combined by a switch 3) to form the original information signal. Tracking control (100) is provided to control the lateral position of the ansducer head in response to the carriers which are derived tracks on opposite sides of the track being scanned.

公开(公告)号：EP0110680A3

公开(公告)日：1985-12-18

申请号：EP83307180

申请日：1983-11-24

Applicant: Matsushita Electric Industrial Co., Ltd.

Inventor： Ochi, Atsuo ,  Hashima, Akio ,  Tomita, Masao

IPC: G11B05/52 ,  G11B05/008 ,  G11B05/14 ,  G11B05/12 ,  G11B05/02

CPC classification number: G11B15/14

Abstract: A magnetic recording/reproducing apparatus comprises a ' rotor drum (11) mounting thereon a plurality of rotary magnetic heads (1a, 1b, 1c, 1d), a plurality of reproducing amplifiers (5a-5d), recording/reproducing mode switching circuits (4a-4d), head selection circuits (6, 7), control circuits (21, 22) and a DC voltage source (23). The control signal circuit (21, 22) and the DC voltage source (23) receive a control signal transmitted from a stator drum through a rotary transformer (17, 18b) and produce signals for controlling the mode switching circuits (4a-4d) and the head selecting circuits (6, 7) and a DC voltage for energizing all the circuits on the rotor drum, respectively.

公开(公告)号：EP0159042A3

公开(公告)日：1988-06-08

申请号：EP85104736

申请日：1985-04-19

Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

Inventor： Hitotsumachi, Shuzo

IPC: G11B20/24 ,  G11B20/02 ,  G11B05/008

CPC classification number: G11B20/24 ,  G11B20/025 ,  H03G3/345 ,  H03G3/348

Abstract: In a rotary head magnetic recording and reproducing system of a helical-scan type for successively recording and reproducing audio signals in and from record patterns on a magnetic tape, which record patterns are inclined relative to the longitudinal direction of the magnetictape, by a magnetic head provided on a rotary cylinder, during the successive reproduction of the record patterns by the magnetic head, in order to prevent noise from being contained in a reproduced audio signal which noise is caused by the switching of the record patterns to be reproduced or by the occurrence of a dropout in the reproduced signal, an audio signal is divided into two discrete signals which have a phase difference therebetween and are transmitted respectively on two separate transmission paths. and two hold circuits (5, 7; 10,11), each of which is arranged in one of the two transmission paths, are put into operation in synchronism with the switching of the record patterns or the occurrence of the dropout in the reproduced signal, and output signals (G, H) of the two hold circuits (5, 7; 10, 11) are added together thereby to reduce noise contained in the reproduced output audio signal (H', L).

公开(公告)号：EP0206255A3

公开(公告)日：1988-03-09

申请号：EP86108344

申请日：1986-06-19

Applicant: SONY CORPORATION

Inventor： Oguro, Masaki

IPC: G11B20/10 ,  G11B05/008

CPC classification number: G11B27/032 ,  G11B5/0086 ,  G11B15/026 ,  G11B20/10527 ,  G11B2020/10592 ,  G11B2220/90 ,  G11B2220/913

Abstract: A PCM (pulse code modulated) audio signal recording and/or reproducing apparatus is disclosed, in which a scanning track area formed by one scanning of a rotary head (1, HA, HB) on a tape (2) is separated into a plurality of track areas in its longitudinal direction to thereby form multi-channel segment track areas and the PCM audio signal (SL, SR) is recorded on and/or reproduced from each of segment track areas of each channel on the tape (2). According to this apparatus, when a plurality of programs are sequentially recorded in a timer scheduled event recording mode, it becomes possible to select (30) a recording mode (S) (series recording mode) in which the recording is carried out only on the segment track area of one channel and a mode (P) (parallel recording mode) in which the recording is sequentially carried out on segment track areas of different channels.

公开(公告)号：EP0171234A3

公开(公告)日：1987-10-28

申请号：EP85305301

申请日：1985-07-25

Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY

Inventor： Knowd, Michael J. c/o Minnesota Mining and

IPC: G11B05/02 ,  G11B05/008 ,  G11B20/18 ,  G11B20/10

CPC classification number: G11B20/00123 ,  G11B20/00086 ,  G11B2020/10546

Abstract: Circuitry usable in a tamper protected recording system for characterizing audio signals at the time of recording including a filter (10) for selecting a portion of the audio signal, a zero crossing detector (14) to detect zero crossings, a threshold detector (16) to determine when the threshold of the detector is satisfied, a first microprocessor (18) for counting the zero crossing detections for successive time intervals and determining for each of the time intervals whether the threshold was satisfied and a second microprocessor (20) for converting the counts and threshold information into data signals that can be recorded with the audio signal.

公开(公告)号：EP0206569A3

公开(公告)日：1987-10-21

申请号：EP86304185

申请日：1986-06-02

Applicant: SONY CORPORATION

Inventor： Oguro, Masaki c/o Patents Div. Sony Corporation ,  Kawakami, Hajime c/o Patents Div. Sony Corporatio ,  Motohashi, Shunji c/o Patents Div. Sony Corporatio ,  Fukushima, Shinichi c/o Patents Div. Sony Corporat ,  Nagamune, Masahiro c/o Patents Div. Sony Corporat

IPC: G11B27/34 ,  G11B33/10 ,  G11B27/10 ,  G11B05/008 ,  H04N05/92 ,  G11B20/10

CPC classification number: G11B27/34 ,  G11B5/00878 ,  G11B33/10 ,  G11B2220/90 ,  G11B2220/913

Abstract: A display apparatus for a multi-channel PCM recorder comprises a display device (10) having a first set of display segments (16a to 16f), each segment (16a to 16f) corresponding to one of a number of channels, a pilot signal reproducing circuit (26) for reproducing a pilot signal superimposed on PCM data recorded on channels of a magnetic tape, a first logic circuit (25) . supplied with the reproduced pilot signal and a timing signal for generating indication signals representing pre-recorded channels, and a drive circuit for supplying said indication signals to the first set of display segments (16a to 16f).

公开(公告)号：EP0131727A3

公开(公告)日：1987-08-26

申请号：EP84106171

申请日：1984-05-30

Applicant: International Business Machines Corporation

Inventor： Fields, Davis Stuart, Jr.

IPC: G11B27/36 ,  G11B15/12 ,  G11B05/008 ,  G11B05/48 ,  G11B05/265 ,  G11B05/39

CPC classification number: G11B5/00817 ,  G11B5/4893 ,  G11B15/12 ,  G11B20/1816 ,  G11B27/36

Abstract: A digital tape drive wherein tape is written, and a read-after-write operation is immediately performed to check the integrity of the write operation, for either direction (11, 12) of tape movement. The tape (10) contains a plurality of parallel data tracks. Two read/write head modules (14, 15) span the entire tape. The read (R) and write (W) gaps of each module are alternately spaced across the width of the tape, such that the write gaps of one module are aligned with the read gaps of the other module. When one module is selected for writing, as a function of the direction of tape movement, the other module is selected to read-after-write check the first module's written data. One module (14) writes odd-track data during one direction (11) of tape movement, and reads even-track data during the opposite direction (12) of tape movement; as the other module (15) writes even-track data during said opposite movement direction (12), and reads odd-track data during said one movement direction (11). Common read and write electronic circuits are switched between the two modules, since each module is using only one of its read and write gap multiples at any given time.

公开(公告)号：EP0196216A3

公开(公告)日：1987-08-12

申请号：EP86302193

申请日：1986-03-25

Applicant: SONY CORPORATION

Inventor： Tani, Toshiyuki c/o Sony Corporation ,  Inazawa, Yoshizumi c/o Sony Corporation ,  Takahashi, Toshihiko c/o Sony Corporation ,  Satomura, Shigeyuki c/o Sony Corporation

IPC: G11B20/10 ,  G11B15/473 ,  G11B05/008

CPC classification number: G11B15/4731 ,  G11B15/1875 ,  G11B20/10527

Abstract: Apparatus for reproducing a digital signal includes a rotary head (11 A, 11 B) that accurately reproduces the digital signal, which is recorded on a tape (14), even when the tape runs at high speed. Transitions of a reproduced signal are detected (32), intervals corresponding to the transitions are counted (33) on the basis of a predetermined reference signal, and the rotation of the rotary head ( 11 A, 11 B) is controlled in response to the counted value so that the relative speed between the rotary heads (11 A, 11 B) and the tape (14) is held constant, notwithstanding changes in the absolute speed of the tape, as in a fast-forward mode.

Abstract translation: 用于再现数字信号的设备包括即使当磁带以高速运行时也能够精确地再现记录在磁带（14）上的数字信号的旋转磁头（11A，11B）。 检测再现信号的转变（32），基于预定参考信号对与转变相对应的间隔进行计数（33），并且响应于旋转头（11A，11B）的旋转 计数值，从而使旋转磁头（11A，11B）和磁带（14）之间的相对速度保持不变，尽管磁带的绝对速度发生变化，就像快进模式一样。