JPH02134788A - Rotary head type recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the deterioration in the signal and S/N at dubbing by monitoring a signal subject to dubbing via a monitor exclusive head. CONSTITUTION:A head drum 1 is driven counter clockwise, the content of a tape 3a is dubbed on a tape 8b. In this case, magnetic heads HA, HB, HC, HD are fitted apart by 90 deg. each and two sets of tape guide posts 4a, 4b are provided to the symmetrical position of the drum 1. Then the heads HA, HC are used as recording/reproducing heads and the heads HB, HD are used as monitor exclusive heads and the error state is monitored by the heads HB, HD. Thus, the error rate after dubbing is grasped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application for J-Graduate School] The present invention relates to an apparatus for recording or reproducing a long recording medium by bringing it into contact with a rotating head drum for dubbing.

[Conventional technology]

Conventionally, when dubbing the contents recorded on one tape onto another tape, a reproducing device and a recording device were used separately, and the dubbing was performed using these devices.

[Problems to be Solved by the Invention] However, since the reproducing device and magnetic recording must be prepared separately in this way, there are the following drawbacks.

(In the 11-rotary head type magnetic recording/reproducing device 716, since the rotating head drum portion is expensive, it is disadvantageous in terms of cost to use two magnetic recording/reproducing devices.

(2) When two magnetic recording/reproducing devices are used, the signal transmission distance becomes longer, resulting in greater S/N deterioration.

(3) It was not possible to manage errors in dubbed signals.

SUMMARY OF THE INVENTION Therefore, in view of the above-mentioned points, an object of the present invention is to provide a rotary head type recording and reproducing apparatus that is inexpensive and reduces signal deterioration when dubbing, and is configured so that the signal after dubbing can be immediately monitored. It is in.

The dubbed signal is monitored via a dedicated monitor head.

[For production]

In the present invention, a single head drum is provided with a recording/reproducing head and a dedicated monitor head, and two systems of tape are brought into contact with the head drum for recording/reproducing.
It becomes possible to 1) reduce manufacturing costs, 2) prevent S/N deterioration, and 2) monitor dubbed signals.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a device for recording or reproducing by bringing a long recording medium into contact with a rotating head drum, and a guide for bringing two systems of long recording media into contact with the head drum. means, a recording or reproducing head placed on the head drum, and a monitoring head placed on the head drum, and when dubbing is performed from one recording medium to the other recording medium, (Embodiment) An embodiment of the present invention, which will be described in detail below, includes two sets of magnetic tape guide means arranged on a rotary head drum having four magnetic heads arranged symmetrically. This is a digital magnetic recording and reproducing device for dubbing in which two of the four magnetic heads provided are used exclusively for monitoring.

That is, in one embodiment of the present invention, four heads are placed on one rotary head drum, two sets of tape guide means are provided at symmetrical positions on the drum, and two of the four heads are monitored for error status. A dedicated head is used to monitor the error rate after dubbing.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an entire embodiment of the present invention. In this figure, 1 is a rotary head drum to which four magnetic heads are attached (details are shown in FIG. 2).

2a and 2b are tape cassettes in which magnetic tapes are stored; 3a and 3b are magnetic tapes of the tape cassette; 4
a and 4b are tape guide posts, 5a and 5b are detection pins for detecting tape tension, 6a and 6b are tape guide posts, 7a and 7b and 8a and 8b are coordinate conversion posts for three-dimensional running of the tape, 9a and 9b
is a tape guide post, 10a and 10b are capstans, lla and llb are pinch rollers for feeding the tape,
12a and 12b are tape guide means.

FIG. 2 shows the arrangement of heads provided on the rotary head drum 1 shown in FIG. In this figure, 11A, )IB
, IIc, and +10 are magnetic heads, which are mounted 90 degrees apart.

In this example, HA and ■. is used as a recording/reproducing head, and II and H8 are used as monitor-only heads.

FIG. 3 is a block diagram showing the signal processing system in this embodiment. Here, 13 is a system controller that controls this apparatus, and 14a, 14bd, and 14c cut and smoke signals in response to control signals from the system controller 13. 15a, 15bd, and 15c are playback amplifiers that amplify the output of each head to a predetermined level, 18a and 16c are recording amplifiers that obtain an appropriate recording current, and 17a, 17bd, and 17c are amplifiers that amplify the output of each head to a predetermined frequency characteristic. Waveform equalization circuits 18a, 18bd and 1 for
8c is a comparison circuit for converting the waveform-equalized signal into a TTL pulse train and outputting it; 19a, 19bd, and 19c are demodulation circuits for demodulating the pulse train; 20a, 20bd, and 2;
0c is a memory for temporarily storing the demodulated signal; 21
a, 21bd, and 21c are error correction calculation units for correcting errors in the signals stored in each memory and monitoring their status; 22a and 22c are for writing error status of the monitored signals into the subcode area of the magnetic tape. The subcode generators 23a and 23c are modulation circuits for performing predetermined modulation.

Next, the operation of this embodiment will be explained in FIGS. 4(1) to 4(5).
). Here, the circuits shown in FIGS. 4(1) to 4(5) are the same as the circuit shown in FIG. 3, except that the signal system to be activated is shown in bold lines.

Now, assume that the head drum 1 is rotated counterclockwise as shown in FIG. 2 to dub the contents of the tape 3a onto the tape 3b.

■ Head] 1A is reproducing the signal from tape 3a, and head Hc is recording the contents of tape 3a onto tape 3b. At this point, the signal is processed through the path shown in FIG. 4 (1).

■ The head 118 is monitoring the tape 3b after dubbing. At this time, the signal is processed through the path shown in FIG. 4(2).

■ Head Hc reproduces the signal from tape 3a, and
When A is recording the contents of tape 3a on tape 3b. At this time, the signal is processed along the path shown in FIG. 4(3).

■ When head H8 monitors tape 3b after dubbing. At this time, the signal is processed through the path shown in FIG. 4 (4).

■ In the above-mentioned conditions ■ and ■, if the error after dubbing is determined to be worse than the predetermined value, a subcode indicating that the dubbed track is invalid will be added to the following several tracks. It is necessary to write to the subcode area.

Therefore, the sub-coat is recorded by alternately passing through the solid line and broken line paths shown in FIG. 4(5).

Note that for tracks for which it is determined that the error is dog, the head tram 1 may be rotated back and dubbed again.

〔Effect of the invention〕

As described above, according to the present invention, since the recording/reproducing head and the dedicated monitor head are provided on a single head drum, it is possible to reduce manufacturing costs and prevent S/N deterioration, and also to reduce dubbing. This makes it possible to monitor the signals generated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the entire embodiment of the present invention, FIG. 2 is a diagram showing the head arrangement in the head drum, FIG. 3 is a block diagram showing the signal processing system in the wooden embodiment, and FIG. ) to FIG. 4(5) are block diagrams for explaining the operation of the tree embodiment. DESCRIPTION OF SYMBOLS 1... Rotating head drum, 2a, 2b... Tape cassette, 3a, 3b... Magnetic tape, 4a, 4b... Tape guide post, 5a, 5b...
・Tape tension detection post, 6a, 6b...Tape guide post, 7a, 7b, fla, 8b...Coordinate conversion post, 9a, 9b...Tape guide post,
10a, 10b...capstan, 11a, llb...pinch roller, 12a, 12b...tape guide post, 13...
System controller, 14a, 14bd, 14c...Switcher, 15a,
15bd, 15c = reproduction amplifier, 16a, 16c...
・Recording amplifier, 17a, 17bd, 17cm waveform equalization circuit, 18a, l
8bd, 18cm=comparison circuit, 19a, 19bd, 19
c・=Demodulation circuit, 20a, 20bd, 20c・“Memory, 21a, 21bd, 21c...-Error correction calculation circuit, 22a, 22c...Subcode generation circuit, 23a,
2: lc...modulation circuit, tlA, Hc...recording/reproduction head, Ha, 1-10...monitor-only reproduction head.

Claims (1)

[Scope of Claims] 1) In an apparatus for recording or reproducing by bringing a long recording medium into contact with a rotating head drum, a guide means for bringing two systems of long recording media into contact with the head drum; A recording or reproducing head mounted on the head drum, and a monitor-only head mounted on the head drum, and when dubbing is performed from one recording medium to the other recording medium, the monitor-only head is mounted on the head drum. A rotary head type recording/reproducing device characterized in that the dubbed signal is monitored through a head.