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81. 发明专利

AU636905B2 CUTTING APPARATUS FOR AN OPTICAL DISC 未知
公开(公告)号：AU636905B2
公开(公告)日：1993-05-13
申请号：AU6116090
申请日：1990-08-21
申请人： SONY CORPORATION
发明人： FUMIAKI HENMI , KOICHI NAKAJIMA
IPC分类号： G11B7/004 , G11B7/125 , G11B7/126 , G11B7/26
摘要： A cutting apparatus is provided, in which a recording laser beam from a laser light source (1) is ON/OFF-modulated by an optical modulating device (8) on the basis of a square output signal in which a video FM wave signal is pulse width modulated by an audio FM wave signal thereby to form exposure pits on a master disc (15,16). This cutting apparatus includes a photodetector (38) for receiving one portion of the recording laser beam irradiated on the master disc (15,16) from the laser light source (1) or a photodetector (38a) for receiving a reflected light of the recording laser beam irradiated on the master disc from the laser light source (1) and which is reflected on the master disc (15,16). A detected output signal from the photodetector (38,38a) is supplied through a low-pass filter (39,39a) to a control circuit which controls an intensity of an output laser beam from the laser light source (1)

82. 发明专利

AU635280B2 DIGITAL VIDEO RECORDING PLAYBACK SIGNAL BLOCK IDENTIFICATION 未知
公开(公告)号：AU635280B2
公开(公告)日：1993-03-18
申请号：AU5752090
申请日：1990-06-15
申请人： SONY CORPORATION
发明人： TETSURO SUMA
IPC分类号： G11B5/008 , G11B27/30 , H04N5/7826 , H04N5/926 , H04N9/877 , H04N9/888
摘要： Digital video data recorded in D-1 format, wherein the video data is recorded in successive block units with each block unit being comprised of several segments recorded in plural tracks and with each segment including unit identifying data, is recovered by scanning the tracks with plural sets of reproducing heads (20) to reproduce plural segments concurrently from plural tracks. The unit identifying data in the segments reproduced by all of the reproducing heads in the plural sets are sensed to detect (21) when the unit identifying data in those segments includes common unit identification, thus determining that all of the segments of a preceding block unit have been reproduced from the record medium. That preceding block unit then can be supplied in its entirety to processing or display devices, such as a television monitor.

83. 发明专利

AU635252B2 SAMPLING RATE CONVERTER 未知
公开(公告)号：AU635252B2
公开(公告)日：1993-03-18
申请号：AU5234990
申请日：1990-03-29
申请人： SONY CORPORATION
发明人： JUN TAKAYAMA , TADAO FUJITA , TAKESHI NINOMIYA
IPC分类号： H03H17/00 , H03H17/02 , H03H17/06 , H04N7/01
摘要： In a sampling rate converter, an input digital video signal has its sampling rate converted from a first sampling frequency to a second or different sampling frequency by oversampling the input digital video signal at a rate which is an integral multiple of the first sampling frequency so as to generate zero values between data of the input digital video signal, interpolating an output signal from the oversampled input digital video signal, decimating the interpolated output signal for generating therefrom a digital video signal having the desired second sampling frequency, and only then applying the digital video signal having the second sampling frequency to a low pass filter, preferably of the finite impulse response type, for eliminating therefrom an undesirable signal component which is due to the sample rate conversion and which appears between frequency bands of one-half of the first and second sampling frequencies, respectively.

84. 发明专利

AU634568B2 MICROWAVE ANTENNA 未知
公开(公告)号：AU634568B2
公开(公告)日：1993-02-25
申请号：AU6108890
申请日：1990-08-17
申请人： SONY CORPORATION
发明人： KEIJI FUKUZAWA , SHINOBU TSURUMARU , JUNICHI KAJIKURI , FUMIHIRO ITO
IPC分类号： H01Q21/00 , H01Q21/06 , H01Q21/24
摘要： A planar microwave antenna of the suspended line feed type has a substrate sandwiched between a pair of conductive plates, each of the plates having aligned openings (4) defining radiation elements (8, 9). The substrate is held in place by holding portions (13) surrounding the openings (4) and wide grooves between the openings (4) house a plurality of parallel suspended lines (7).

85. 发明专利

AU634001B2 CHECKING SYSTEM FOR AN OPTICAL DISC 未知
公开(公告)号：AU634001B2
公开(公告)日：1993-02-11
申请号：AU6780190
申请日：1990-12-05
申请人： SONY CORPORATION
发明人： TOMIO OHASHI , FUMIAKI HENMI
IPC分类号： G11B7/26 , G11B27/028 , G11B27/10 , G11B27/36
摘要： A disc evaluating apparatus comprising a master tape player for playing back a master tape where an original signal to be used in a disc cutting step is recorded, a disc player for playing back a disc member, a sync signal generator for producing a reference sync signal from a reference clock signal and supplying such sync signal to both the master tape player and the disc player, and a controller for simultaneously controlling the operations of the master tape player and the disc player. The master tape and the disc member having the same content signals recorded thereon are played back in exact synchronism with each other, so that the information recorded on the disc member can be simultaneously compared with the information on the master tape.

86. 发明专利

AU633345B2 MAGNETIC HEAD POSITION CONTROLLING APPARATUS 未知
公开(公告)号：AU633345B2
公开(公告)日：1993-01-28
申请号：AU6110190
申请日：1990-08-17
申请人： SONY CORPORATION
发明人： NOBUYUKI OKA , HIROSHI ETO , NOBUYUKI YASUDA , TETPEI YOKOTA
IPC分类号： G11B21/21 , G11B11/10 , G11B11/105
摘要： A magnetic head position control apparatus for driving the magnetic head (2) of a disc recording apparatus toward or away from the recording surface of a magneto-optical disc (5) to effect position control of the magnetic head. Changes in the distance between the magnetic head and the magneto-optical disc are detected from changes in capacitance between a capacitance detection electrode (6) mounted on the magnetic head and a surface of the magneto-optical disc. An oscillator circuit (7) connected to the capacitance detection electrode varies its oscillation frequency in response to changes in capacitance and detects such frequency variations and controls the position of the magnetic head for maintaining it at a constant predetermined distance from the magneto-optical disc.

87. 发明专利

AU632889B2 CASSETTE EJECTING MECHANISM OF A TAPE PLAYER 未知
公开(公告)号：AU632889B2
公开(公告)日：1993-01-14
申请号：AU6943691
申请日：1991-01-16
申请人： SONY CORPORATION
发明人： MASAFUMI TAMURA
IPC分类号： G11B15/61 , G11B15/665 , G11B15/675
摘要： A cassette ejecting mechanism of a tape player is so configured that a cassette holder is provided with a portion to be locked whereas a head drum withdrawal lever is provided with a lock portion, so that when the cassette holder has moved to a loading position, the lock portion of the head drum withdrawal lever prevents the cassette holder from moving toward an ejecting position and locks it at a loading position, but when the head drum withdrawal lever is retracted, the lock is released to permit the cassette holder to move to the ejecting position. At the same time, the portion to be locked of the cassette holder is located in front of the lock portion of the head drum withdrawal lever and prevents the head drum withdrawal lever from returning to a forward position; namely, the head drum is locked at the retracted position. Accordingly, locking and unlocking of the cassette holder in and from the loading position as well as locking of the head drum in the retracted position can be reliably carried out in a predetermined order only by means of the cassette holder and the intermediate lever.

88. 发明专利

AU632137B2 VITERBI DECODER 未知
公开(公告)号：AU632137B2
公开(公告)日：1992-12-17
申请号：AU5762990
申请日：1990-06-19
申请人： SONY CORPORATION
发明人： IZUMI HATAKEYAMA
IPC分类号： H03M13/41
摘要： This invention relates to a Viterbi decoder for decoding a convolution coded reception signal. The Viterbi decoding is an algorithm for efficiently executing the maximum likelihood decoding using a convolution code by selecting a path locating at the minimum distance from a reception series between two paths which are joined. Since it is necessary to store a state metric of each state, after the state metric of the surviving path was calculated by ACS calculation (3), it is considered to normalize metrics. However, this results in a large circuit scale and a low processing speed. Therefore, in this invention, a maximum likelihood value (11) of a present state metric is detected from a maximum likelihood branch metric pair (10) before the ACS calculation (3) and the preceding maximum likelihood state metric pair (12) and metrics are normalized (5) by using the maximum likelihood value.

89. 发明专利

AU631742B2 APPARATUS AND METHODS FOR RECORDING INFORMATION SIGNALS AND TRACKING SIGNALS ON MAGNETIC TAPE 未知
公开(公告)号：AU631742B2
公开(公告)日：1992-12-03
申请号：AU7735391
申请日：1991-05-27
申请人： SONY CORPORATION
发明人： NAOFUMI YANAGIHARA
IPC分类号： G11B5/53 , G11B5/008 , G11B5/588 , G11B15/467 , H04N5/7826
摘要： An apparatus for recording information and tracking signals on magnetic tape (11) includes first and second magnetic heads (HL, HT) for recording the information signals on the tape (11). The heads (HL, HT) are mounted for rotation about an axis for scanning the tape (11) for recording the information signals in successive tracks, and are disposed at respective positions along the axis separated from one another by substantially one track pitch and have respectively different azimuth angles. A third magnetic head (HL min ) records the tracking signals on the tape (11) and is mounted at a position rotationally substantially opposite the first head (HL), and is substantially aligned therewith. The tracking signals are recorded in at least some of the successive tracks with azimuth angles substantially the same as those of the information signals in adjacent ones of the successive tracks.

90. 发明专利

AU631725B2 HIGH DENSITY OPTICAL DISC SYSTEM AND OPTICAL DISC 未知
公开(公告)号：AU631725B2
公开(公告)日：1992-12-03
申请号：AU7186091
申请日：1991-01-30
申请人： SONY CORPORATION
发明人： TETSU WATANABE , YOSHIO AOKI
IPC分类号： G11B11/10 , G11B7/00 , G11B7/0037 , G11B7/004 , G11B7/135 , G11B7/24 , G11B11/105
摘要： The present invention relates for a recordable optical disc, which comprises a recordable layer (43) onto which a laser beam is converged by an objective lens (2) having a numerical aperture (NA) falling within a range of about 0.55 to 0.70, and a light-transmitting substrate (41) supporting the recordable layer (43), the light-transmitting substrate (41) having a thickness falling within a range of about 0.1 to 0.6 mm and transmitting the laser beam therethrough to and converged on the recordable layer (43).

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