Pioneer Electronic Corporation

Hitachi, Ltd.

Pioneer Electric Corporation

Pioneer Display Products Corporation

Ichiro Miyake

Hiroo Okamoto

Shin-ichi Wakumura

Takao Arai

Tokihiro Takahashi

Shunichiro Sakamoto

Yuuji Hatanaka

Kenichiro Tada

Tomoyuki Suzuki

Shinichi Nagahara

Tsutomu Takahashi

Tomoyasu Yamada

Gaku Yamamura

Kazutomo Watanabe

Yasuyuki Noda

Masayoshi Murayama

Hiroshi Kida

Tsutomu Ohtani

Masaaki Saito

Ryuichiro Yoshimura

Masami Tsuchida

Yoshimi Iso

Yuji Hatanaka

Tsunao Hasegawa

Fumihiko Miyamoto

Shinichi Wakumura

Tsuano Hasegawa

An information recording and reproducing apparatus with a ring buffer, in which user can know a state of the ring buffer in a real-time manner and a monitoring method of the ring buffer. A ring buffer monitor image signal is generated which indicates an image showing a relative positional relation of a current recording position and a current reproducing position in the ring buffer.

Information recording and reproducing apparatus with a ring buffer and method for monitoring ring buffer

Disclosed is an apparatus for recording and reproducing information and an information reproducing method in which the reproducing operation can be restarted from a position where reproduction was interrupted. The restart is possible for all of information contents recorded on a recording medium and without the need of troublesome operations. For this purpose, reproduction history information representing a reproduction history of each of the information contents recorded on the recording medium is stored in a management memory.

Apparatus for recording and reproducing information and information reproducing method

Disclosed is a PCM signal reproducing/recording apparatus which comprises a reproducing device for reproducing a recording medium carrying PCM data and sub-code data recorded thereon, the sub-code data having sub-data and sub-ID for adding auxiliary information to the PCM data, and a recording device for recording the PCM data and sub-code data transmitted from the reproducing device onto a recording medium. The recording device is arranged to selectively record the sub-code data judged to be correct, onto a recording medium, of those sub-code data transmitted from the reproducing device.

PCM signal reproducing/recording apparatus

A method for performing a reproduction and search operation on a data recording and reproducing device of the helical scan type which includes a pair of recording and reproducing heads mounted on a rotary drum. The method includes the steps of: (a) during the reproduction operation, transporting the tape and rotating the rotary drum such that a relative speed between said tape and the heads is either a first relative speed or a second relative speed which is less than the first relative speed; and (b) during the search operation, transporting the tape at a speed substantially greater than a tape speed used during the reproduction operation and rotating the rotary drum at a speed such that a relative speed between the tape and the heads is equal to the second lower relative speed.

Method for recording/reproducing and searching digital signals using a

An offset compensation circuit for compensating a DC offset which occurs in a circuit line including an A/D converter or an A/D and D/A converter in which not only the polarity bit of digital data but also information concerning the amplitude of an analog input signal are applied to an integrator to precisely compensate an offset voltage in a circuit line. The level of a proper offset compensation voltage is provided even when an input analog signal such as a music signal is absent, and when an A/D and D/A converter is provided which can perform both A/D conversion and D/A conversion the DC offset can be precisely compensated shortly after the change of the mode from D/A conversion to A/D conversion.

Offset compensation circuit

PCM signals belonging to a first reproduction channel and a second reproduction channel and grouped into odd number data and even number data are previously recorded on a recording medium having a plurality of tracks in the form of frames each including at least a set of a first track and a second track. In the operation of reproducing the recorded PCM data, the PCM data reproduced by reproduction heads are stored in accordance with a first control signal, errors in the stored reproduced data are detected in accordance with a second control signal, the numbers of errors are counted, comparison is made between the error number of the odd number data and that of the even number data of the first channel and of the second channel, respectively, and the data which has been judged to include a larger number of errors are replaced by interpolated data and finally the interpolated data are mute-processed at the boundary between adjacent frames.

PCM signal reproducing device

An apparatus for recording and reproducing digital signals using a helical scan in which a drum of reduced diameter is employed without changing the tape format. Two heads are mounted on a drum at the same height in opposition to each other with a product of the diameter D of the drum and the wrap-around angle of the tape with respect to the rotary drum being constant while the speed of the drum is increased to a speed N times higher than a predetermined speed. One of the heads is mounted higher than the other by a distance of (1-1/N)P to provide a step, and the other head being is mounted at a position an angle behind the position at which the other head directly opposes the one of the heads, which angle is defined by: ##EQU1## where L is the track length in the tape format used when the rotary drum rotates at the predetermined rotational speed, .THETA. is the track angle, P is the track pitch, and C is a constant dependent on the drum diameter D and the wrap-around angle. Methods for performing high speed searches with this apparatus are also disclosed.

Apparatus for recording and reproducing digital signals using a helical

A data outputting circuit including absolute value conversion circuit for converting digital data that is inputted with a determined sampling period into absolute value data, a register for storing the largest of the absolute value data provided within a predetermined period of time, a transferring register for receiving data and trransferring the data every predetermined period of time, and a compressing circuit adapted to compress compressing the data applied to the transferring register, whereby the circuit scale is reduced, and the data transferring time or the number of transferring lines is decreased.

Data outputting circuit

A magnetic recording a playback device which records or reproduces slant-oriented areas on adjacent tracks by reversing the tape. One of the heads, for instance, the recording/reproducing head on a rotary drum is adjustable in the axial direction of the drum so that only one erase head is required.

Bidirectional magnetic recording and reproducing device with an axially

A control circuit for a helical scan playback, in which a rotary head is moved transversely by a varying amount. The transverse movement can be either a multi-valued tracking position error correction signal or a saw-tooth waveform, effective during a location data strip, for compensating for the fast movement of the tape during a scan operation.

Track position correction for a helical scan magnetic playback

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Tokorozawa, Japan

Ichiro Miyake