Polygram International Holding B.v.

U.S. Philips Corporation

Polygram International Holding

Jozef M Duurland

Johannes J Roering

Willem L Van Der Kruk

Norbert C Vollmann

Bernard H Timmer

Sinnighe J Bos

Hendrik K Kreeft

A system is provided which records reproduces signals on/from a magnetic tape in a cassette in longitudinal tracks in two track patterns in two adjacent tape zones which are inscribed/read in opposite directions. The cassettes are non-reversible and comprise one imperforate main wall. Without exception the associated apparatuses comprise, as a standard feature, recording/reproducing signals in the two opposite directions without reversal of the cassette. The system may be constructed as a two-standard system suitable for use with both reversible and non-reversible cassettes in conformity with non-compatible standards on two-standard apparatuses.

Auto reverse cassette deck capable of recording/reproducing with two

An arrangement for reading a digital audio signal from a master medium (7) and storing it in a digital storage medium (10, 90, 90') at a first bit rate in a first step, and for repeatedly reading the digital audio signal from the storage medium and recording the digital audio signal on a recording medium (20') at a second bit rate in a second step. The digital storage medium is adapted to store a digital information signal which is a representation of a first music program (M1) and a digital information signal which is a representation of a second music program (M2). The arrangement (FIG. 1b) is further adapted to repeatedly read the digital information signal representing the first music program from the digital storage medium while reading the digital information signal representing the second music program into the digital storage medium in the second step.

Arrangement for obtaining prerecorded digital music cassettes

A digital audio signal is reproduced from a master medium (7) and stored in a digital storage medium (10, 90, 90') at a specific first bit rate, after which it is read from the digital storage medium and recorded on a recording medium at a second bit rate. The digital audio signal, in the form of a first digital information signal having channel words of n data bits, is stored in a track (Ta.i) on the master medium. This signal is converted in an n-m demodulator (9, 15), the n-bit channel words being converted into m-bit information words, where n&gt;m. After this the signal is stored in the digital storage medium (90, 90') as a second digital information signal. After read out from the storage medium (90, 90') the second digital information signal is converted into a third digital information signal, which substantially corresponds to the first digital information signal, in an m-n modulator (11, 36), in whcih the m-bit information words are reconverted into n-bit channel words. This enables the storage capacity of the digital storage medium to be reduced.

Method of and arrangement for obtaining prerecorded digital music

A copying apparatus (1) for copying a magnetic pattern from a master magnetic tape (5) on a duplicate magnetic tape (6) comprises two facing elongate platens (9, 10) having mutually parallel gap sides (9A, 10A) which bound a gap (13). Copying means (20) are provided to promote the signal transfer from the master to the duplicate magnetic tape. In the gap sides (9A, 10A) of the platens (9, 10) passages (18) are arranged, through which passages a pressurized fluid is fed into the gap (13), so that the tapes are intimately pressed against one another inside the gap (13). In the gap sides (9A, 10A) expulsion means (16A, 10E, 10K, 23) are provided to expel air present between the tapes, the expulsion means in each gap side, in a view at the gap side, being arranged in at least one V-shape having an axis of symmetry which extends substantially parallel to the longitudinal direction of the platens (9, 10), at least a number of the passages being situated within the outline of the V-shape.

Copying apparatus for copying a magnetic pattern from a master magnetic

A magnetic-tape-cassette apparatus has a loading device which prevents improper insertion of a digital audio tape cassette having a slide for closing the cassette openings. The cassette has a U-shaped slide which, in the closed position, defines one side of a slot extending halfway up to opposite side wall of the cassette housing and across the bottom wall of the cassette housing. The loading device has two positioning elements, a respective one near each side of the loading device bottom section, arranged so that the positioning elements engage the parts of the slot extending up the side walls when the cassette is properly inserted on the bottom section of the loading device. When the loading device moves the cassette toward the apparatus interior, the positioning elements are withdrawn from engagement in the slot, the cassette slide is unlatched, and the slide is then moved with respect to the rest of the cassette to an open slide position which permits the cassette cover to be opened so that the cassette tape can be threaded and played. The slot in the cassette is disposed a shorter distance from the cassette rear wall than from the cassette front wall, so that the cassette cannot be fully received on the loading device if it is improperly oriented. A cassette detector detects the presence of the cassette only if it is so inserted that the projections engage the slot portions extending up the side walls of the cassette.

Apparatus drawer for unambiguously receiving a digital audio tape

Within the housing of a magnetic tape cassette, two liner foils bear against turns of magnetic tape on each of two reel hubs. Each reel hub has an inner ring and an outer ring, the inner ring being longer axially than the outer ring, and arranged so that each liner foil bears elastically against the respective axial ends of the inner and outer rings of each reel hub adjacent that foil. Each cassette main wall has two drive openings aligned with the respective reel hubs. Each opening has a centering rim for the reel hub, and a concentric flat supporting rim having an inner diameter larger than the outer diameter of the reel hub, for supporting the liner foil adjacent that cassette main wall. The distance between opposed supporting rings is greater than the sum of the width of the magnetic tape and the thicknesses of the two foils.

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Baarn, Netherlands

Jozef M Duurland