Pioneer Electronic Corporation

Tomoyasu Yamada

Nobutoshi Fukuda

Tokihiro Takahashi

Tomoyuki Suzuki

Shinichi Nagahara

Ichiro Miyake

Tsunao Hasegawa

Yutaka Masumoto

Yoshiki Furuta

Naoto Arifuku

Masahiro Sui

Masashi Tanabe

Seiichi Yokosawa

Shinichi Yamamisaka

Tetsuro Nagao

A magnetic tape cassette recording and playback apparatus, particularly for digital audio tapes, capable of performing a variety of controlled playback and recording operations in accordance with a user-inputted program. The cassettes are stored on shelves in a magazine and selectively extracted and transported to a drive unit for playing and recording. In one mode, the apparatus can carry out continuous recording from one cassette to another, and cassettes can be designated for recording, for instance, of only particular types of music. The cassettes are rewound at the completion of a playing program so as to be ready for the start of search operations for a subsequent program.

Magnetic tape recording/playback apparatus for automatically detecting a

A PCM digital audio signal playback apparatus is provided for extracting from the digital audio signal read out from a recording medium an original signal component ranging lower than 1/2 of its sampling frequency fs, producing a harmonic from the original signal component, extracting a harmonic component ranging higher than fs/2 from the harmonic, and adding the harmonic component to the original signal component. Accordingly, a high-frequency carrying signal, e.g. an impulse, is processed without causing ringings in the waveform response.

Digital reconstructing of harmonics to extend band of frequency response

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

In a stereo sound digital recording system in which a plurality of tunes or programs are sequentially and digitally recorded on a magnetic tape, the left and right analog input signals are combined and converted to a digital signal. The analog input signals are also applied to a detector which detects the head of the program or tune and which causes to be generated a start identification sub-code signal which is automatically added to the digital signal, before the modulation thereof, and which is recorded on the tape for about nine seconds in the non-sound portion preceding the tune or program. A second sub-code signal, in the form of a program number signal, may also be added to the digital signal, simultaneously with the program start identification sub-code signal, to provide recorded numbers respectively identifying programs which are sequentially recorded on the tape.

Music start signals in a magnetic recording/reproducing device

A tape recorder may be provided with a memory which stores data regarding the unrecorded portion remaining on each of a plurality of recording tapes. The data may represent an amount of the unrecorded portion and/or the location thereof, e.g., in the form of a counter value. The data stored in the memory is displayed in response to an input from an operating panel, thus making it possible to readily identify a tape having a remaining time equal to or greater than the quantity of information to be recorded, and to quickly advance the tape to the beginning of its unrecorded portion.

Tape recorder which displays unrecorded time on magnetic tapes

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

In a digital audio recording/reproducing apparatus of the rotary head type, erasure of signals in previously recorded tracks, which are used to control the operation of a tracking servomotor, is enhanced by the provision of a magnetic field generator prior to the point where overwriting occurs. As a result, errors in the tracking error signal arising due to unerased remnants of the previously recorded signals are eliminated.

Growing community of inventors

Saitama, Japan

Tomoyasu Yamada