JPS63217531A - Dat cassette tape recorder - Google Patents

Abstract

PURPOSE:To use a rotary head drum in common for purpose of double-cassette operation by disposing two DAT cassettes facing to each other with the rotary head drum in the middle, and winding the respective tapes around the drum for a prescribed range. CONSTITUTION:The rotary head drum 1 has an upper drum 1a and a lower drum 1b, and the rotary head disk is disposed between these drums 1a, 1b. To this rotary head disk, a first head chip 2 and a second head chip 3 are provided in such positions that they face each other in an angle of 180 degrees to each other. The DAT cassettes 4, 5 are dispoased in lateral symmetry with the drum 1 in the center. The tapes 4a, 4b from the cassettes 4, 5 are guided by plural tape guides 6 and are made wind around the drum 1 for the angular range of 90 degrees of the central angle of the drum 1. Also, the direction of the rotational axis of the drum 1 is made vertical, and the tapes 4a, 4b are made incline by about 6 degrees. In such a way, a sound is recorded/ reproduced in/from the cassettes 4, 5 selectively in order to record the reproduc tion of a sound from each other.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a digital audio tape (hereinafter referred to as DAT) recording and playback device.
The present invention relates to a DAT cassette tape recorder with a rotating head drum.

[Technical background of the invention]

In recent years, research and development of digital audio tapes has been promoted to replace analog audio tapes, and efforts are being made to unify their standards. Regarding this DAT recording and playback equipment, fixed head type and rotating head drum type are known, but when trying to create a so-called double cassette that can mount two cassettes, both types require two heads. However, it is not cost-effective. In other words, the fixed head type requires a head corresponding to each cassette, which need not be explained in detail, but with a single rotation head drum, the tape should be wrapped around the head more than 180 degrees, just like in a video tape recorder. It was said that the head could not be shared due to the

[Purpose of the Invention] This invention was made in view of the above-mentioned circumstances, and its purpose is to achieve double cassette production without causing a significant increase in cost by sharing a rotating head drum for two DAT cassettes. An object of the present invention is to provide a DAT cassette tape recorder that can perform the following functions.

[Embodiments] The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

As shown in Figures 1 and 2, this DAT
A cassette tape recorder has one rotating head drum, one
It is equipped with This rotary head drum 1, like that of a video tape recorder, includes an upper drum 1a, a lower drum 1b, and a rotary head disk (not shown) disposed between them, and the rotary head disk has two head chips. That is, the first head chip 2 and the second head chip 3 are arranged facing each other with an interval of 180 degrees.

Two DAT cassettes 4 and 5 are symmetrically arranged on both left and right sides of the rotary head drum 1. Each tape 4a, 4b of the cassettes 4, 5 is wound around the rotating head drum 1 by a plurality of tape guides 6, which are well known in video tape recorders. The center angle of the drum 1 is 90 degrees. Further, in performing helical scanning, in this tape recorder, the rotational axis of the rotary head drum 1 is, for example, vertical, and each tape 4a, 4b is inclined by about 6 degrees with respect to this. In addition, the rotating head drum 1 has a speed of 2,000 mph per minute for both recording and playback.
On the other hand, the capstan 7.8 that drives the tapes 4a and 4b rotates at 8.15 mm/mm during recording.
The tape is fed at a constant speed of sec.

ATF (AutoTrackingFol) is used during playback.
(lowing) servo system.

FIG. 3 shows a schematic circuit configuration of this DAT cassette tape recorder.

According to this, 11 is a switch for appropriately switching the first head chip 2 and second head chip 3 between recording and playback, 12 is a recording amplifier, and 13 is a playback amplifier. Usually, the switch 11 is a rotary head drum 1. Switch one of them to the recording or playback side according to the timing of the head switch pulse. In this embodiment, during dubbing, the playback signal of one tape picked up by one of the head chips is applied to the same bed chip via a delay circuit 15, which will be described later, and is transmitted to the other tape. be recorded. 14 is a waveform shaping synchronization section including an equalizer and a PLL (phase locked loop) circuit, and 15 is a delay circuit. This delay circuit 15 delays the reproduction signal picked up by the head chip during dubbing by the 180 degree rotation time of the rotary head drum 1, and supplies the delayed signal to the same head chip as a recording signal. Reference numeral 16 denotes a main control section composed of, for example, a microcomputer, and this main control section 16 includes an ATF circuit 16a and an error correction circuit 16.
b, an 8-10 conversion circuit, a signal processing circuit 16d, and the like. 17 is a tracking servo circuit, 18 is a constant speed rotation servo circuit, and these servo signals are recorded,
Depending on the playback, the capstan 7.
Added to 8.

〔Effect of the invention〕

As is clear from the above description of the embodiments, according to the present invention, since the rotary head drum can be shared for two cassettes, it is possible to downsize the device and reduce costs. Also, when dubbing.

Since the playback signal picked up by the head chip is supplied as a recording signal to the same head chip via a delay circuit, ATF and error correction are required.

Dubbing can be performed without signal processing such as 8-10 conversion. Furthermore, the ATF circuit and the like can be shared, resulting in further reduction and simplification of circuits, and other remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing the arrangement of a rotary head drum and a tape cassette of a DAT cassette tape recorder according to the present invention, and FIG. 2 is a perspective view showing a state in which a tape is wound around the rotary head drum. FIG. 3 is a schematic circuit diagram of the tape recorder. In the figure, 1 is a rotating head drum, 2 and 3 are head chips,
4 and 5 are cassettes, 4a and 4b are DAT tapes, 7 and 8
is a capstan, 11 is a switch, 12 is a recording amplifier,
13 is a reproduction amplifier, 14 is a waveform shaping synchronization section, 15 is a delay circuit, 16 is a main control section, 17 is a tracking servo circuit, 18 is a constant speed rotation servo circuit, and 19 is a switch. Figure 1 Figure 2

Claims (5)

[Claims] (1) A rotating head drum having a pair of head chips arranged oppositely with an interval of 180 degrees is provided, two DAT cassettes are arranged facing each other around the rotating head drum, and each tape is transferred to the above-mentioned rotating head. The two DAs can be wrapped around the drum over a predetermined angle range.
A DAT cassette tape recorder characterized in that it is capable of selectively recording and reproducing T cassettes, and that it is also possible to copy from one DAT cassette to another DAT cassette. (2) The DAT cassette tape recorder according to claim (1), wherein each of the tapes is tilted at a predetermined angle with respect to a virtual plane including the head chip. (3) The DAT cassette tape recorder according to claim (1) or (2), wherein each of the tapes is wound at 90 degrees around the rotating drum head. (4) In claim (1), when duplicating between the DAT cassettes, the playback signal picked up by the head chip is supplied to the same head chip as a recording signal via a delay circuit. recorder. (5) The DAT cassette tape recorder according to claim (4), wherein the delay circuit has a delay time equivalent to the time for 180 degree rotation of the rotary head drum.