JPS5952403A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To record >=3 kinds of information on one slanting track simultaneously in a two-head helical scan type information recording and reproducing device by dividing each slanting track into plural parts and recording a time- compressed signal successively. CONSTITUTION:An audio signal processor 25 converts an audio signal into a PCM signal to perform time compression to about 1/6. A pilot signal generator 44 outputs different signals of four kinds of frequency. Namely, every time the output of a pulse generator 22 is switched to ''High'' or ''Low'', the signals are outputted in the order of f1, f2, f3, f4, f1, and f2. The levels ''High'' and ''Low'' of the output signal of the pulse generator 22 relate to rotary heads 18a and 18b; when the rotary head 18a records a signal on a slanting track, the output B of the pulse generator 22 is at the level ''High'' and when the rotary head 18b records a signal on a slanting track, the output signal B is at the level ''Low''.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a two-head helical scan type information recording and reproducing device, and particularly to a magnetic recording device suitable for recording and reproducing a time-compressed audio signal. .

[Prior art]

Conventional examples of two-head helical scan type information recording and reproducing devices include a home video tape recorder typified by the VH5 system, whose tape pattern is shown in Figure 1, and a home video tape recorder typified by the VH5 system, whose tape pattern is shown in Figure 2. There is a video tape recorder.

In FIG. 1, 1 is a video tape, 2 is a video track where a video signal is recorded, 3 is a control track where a control signal is recorded, 4 is an audio track where an audio signal is recorded, and 5 is a track traced by a rotating head. A directional arrow 6 is an arrow indicating the direction in which the videotape runs.

θ1 in FIG. θ2. θ and θ indicate the angle at which the video tape is wound around the rotating cylinder, respectively.
θ, 50 in θ3, and 1800 in θ2.

θ2 corresponds to the period during which the video signal is recorded, and θ1゜θ
, is a margin to ensure compatibility.

In FIG. 2, 7 converts the audio signal into a PCM signal,
Furthermore, the track on which a signal whose time has been compressed to approximately one-sixth is recorded, 8 is a first option track, and 9 is a second option track.0 In FIG. 2, θ1. θ2. θ3. θ4 indicates the angle at which the video tape is wound around the rotating cylinder, and θ, middle θ, middle 5610. monkey1800504=3
00 is 5.

to corresponds to the period during which the audio signal is recorded, and to.

θ3. OS is the same as in FIG.

As described above, in the past, it was only possible to record one or two types of information on one diagonal track, which narrowed the scope of use of video tapes.

[Purpose of the invention]

An object of the present invention is to eliminate the drawbacks of the prior art, to provide a magnetic recording device that makes it possible to simultaneously record three or more types of information on one diagonal track, and expands the range of use of cassette tapes. Overview] As shown in FIG. 3, the present invention uses one diagonal track (
10 to 16) is divided into N pieces (one piece of 8 to N in FIG. 3), and N pieces of information are recorded simultaneously.

A pilot signal (f, -f, in FIG. S) or a control pulse (11 in FIG. 3) or both a pilot signal and a control pulse are recorded so that tracking can be performed during playback.

Furthermore, in order to align the track pattern with the track pattern of the video signal, the signal created by dividing the frequency of the crystal oscillator output and the rotation speed of the rotary head are synchronized in phase.

[Embodiments of the invention]

Figure m3 is a tape pattern diagram showing an example of the case where the present invention is aligned with the tape pattern of the 6 mm video standard. One extra track is divided into seven pieces, 10 to 16, and seven separate pieces of information are recorded simultaneously.

In the tape pattern shown in FIG. 3, about 2,200 tapes are wound around the rotary cylinder, each of tracks 10 to 16 has a width of 30°, and the beginning and end of the diagonal tracks have 50 overlapping windings.

In FIG. S, LO to 16 indicate diagonal tracks, 8 is a U-th optional track, and 9 is a second optional track. There are cases in which one control pulse for tracking is recorded on the second option track and cases in which it is not. Diagonal track 10-16
K is the pilot signal f,, f,, f for M pieces of information.
,,f, may or may not be multiplexed.

That is, if the tracking method of the apparatus for reproducing the tape shown in FIG. 3 is considered to be both a control pulse method and a pilot method, it is necessary to record both the pilot signal and the control pulse as shown in FIG.

4 and 5 are block diagrams showing an embodiment of the main parts of the magnetic recording apparatus of the present invention for recording the tape pattern shown in FIG. 3. FIG. - FIG. 6 and FIG. 1 are diagrams showing waveforms of various parts in FIGS. 4 and 5.

In FIG. 4, 26.2'/ is an input terminal for two-channel audio signals, and 25 is an audio signal processor.

At 26, the audio signal is converted into a PCM signal, and time-compressed.

4^ is a pilot signal generator, which outputs signals of four different frequencies. That is, the output of the pulse generator 22 (
1 every time B) in Figure 6 switches to Illight, Low.
According to the order of 1cfl→h→mu→mu→f1→h, the e-th
(Outputs the 2p signal.22 output signal High(
, ow are associated with the rotary heads 18α, 18b, and in FIG. 4, 18α is the oblique track 11-1 of FIG.
When recording 6, output B of 22 is Eigk and 18
When B is recording diagonal tracks 11 to 16, the output signal B of 22 becomes Lovo.

The output signal F of the pilot signal generator 44 is Ei of the B signal.
gk, Low, and the B signal is High.
When the signal is k, it becomes h or human, and when the B signal is Lovo, it becomes jl or h.

An example of a pilot signal is f1*a 5fA.

f, +7. 5frut 7s medium α 5fA l
There is f4 +9.5f (f: water synchronous frequency).

Next, phase synchronization of the cylinder motor 2o will be explained.

19α, 19A are 2 attached to the rotating cylinder
The pickup head 21 generates pulses as shown in FIG. 6A.

In the figure, a positive pulse is sent from magnet 19α, which is attached slightly ahead of the 18α head, and magnet 19A, which is attached slightly ahead of the IEIA head.
A negative pulse is emitted from the

The output signal A of the pickup head 21 passes through a pulse generator 22 consisting of a delay circuit, a waveform shaping circuit, etc.
The waveform will be

A phase difference signal between B and C is obtained at the output of the phase comparator 31, which is amplified by the motor driver and drives the cylinder motor 26. Therefore, B and C become signals with the same phase and frequency.

Next, control of the capstan motor 35 will be described. A so-called quartz lock method is used to keep the tape feeding speed at a predetermined value. A frequency divider 39 divides the output signal of a rotational speed signal generator, which is attached to the capstan motor 35 and includes a 9FG 3'l and a pickup head 36, by 7vl-1IIc, and a crystal oscillator 43 is passed through a frequency divider 42. A phase comparator 40 compares the phases of the signals obtained by dividing h×Ih 1/c by 41°. The phase difference signal which is the output signal of 40 is amplified by the motor driver 3 and drives the capstan motor 35.

Next, the case where the tape pattern shown in FIG. 3 is formed using the recording circuit shown in FIGS. 4 and 5 will be described.

FIG. 3 shows a tape pattern in which eight different 7ai music programs were simultaneously recorded.

To create one timing pulse, a frequency divider 32 is used.
Let N be 6. In this case, the input signal to the frequency divider 32 has a D waveform, and the frequency is six times that of the B waveform. Therefore, this waveform is divided by the frequency divider 33.
Divide the frequency into O': 600120C: 1800, 2400
, 300o and signals with different phases A, A, F4.
E5.4 can be obtained.

The program h is converted into a time compressed signal by the processor 25α, and the %-61 conversion timing is as shown in P□ and G in FIG. 6. Po should be set to state and P□ to GA2. Similarly, 7) I is converted to hara, h is converted to hara, 8 is converted to Q, ^ is converted to ^, and P6 is converted to G.

In order to record the tape pattern shown in FIG. 3, it is necessary to apply a signal current H shown in FIG. 6 to the rotary head 18α and a signal current I shown to the rotary head 18J. During the headquarters period, the rotating head does not trace the tape, so the signal current sent to the head is not specified.

In the configuration shown in Figure 5, the H signal and I signal are made the same during the main period to simplify the circuit.Also, in order to simplify the pilot signal generator, both heads 18α and 18b are operated at the same time. The pilot signals written on the tape are made to be the same during the tape tracing period (the one in FIG. 6 is the Highk period).

In FIG. 5, a signal is applied to the control terminal 46 of the switch 45, and the switch 45 is connected to the X side while K is at H level, and connected to the Y side while K is Low.

The K signal is obtained by passing the F signal through a 7 lip-flop 50. 4'7.411% 51 is a mixer, 49 is a rotary transformer.

The 7th factor on the side is a control pulse signal, which is recorded on the control track 9 by the control head 29 as required.

〔Effect of the invention〕

According to the present invention, for example, music programs of type A can be recorded at the same time, and the production time for soft tapes can be significantly shortened. In addition, the tape recorded using the present invention is a normal 6 mm tape.
Since it can be easily played back on a video tape recorder that conforms to the video standard, the scope of use of cassette tapes can be expanded.

[Brief explanation of the drawing]

1 and 2 are tape pattern diagrams showing a tape pattern of a conventional video tape recorder, FIG. 3 is a tape pattern diagram showing an example of a tape pattern formed by the apparatus of the present invention, and FIGS. 4 and 5. 6 is a block diagram showing an embodiment of the main part of the recording apparatus of the present invention, and FIGS. 6 and 7 are similar to FIGS.
FIG. 3 is a waveform diagram showing signal waveforms at various parts in the figure. 18/)...rotating head, Iqll, 14.11% to 1 bird l 16...Divided diagonal track, 2511 to 25 z5c, z5d
, 251. z5f, 25g... Time compression device. Sai 3 illustration

Claims (1)

[Claims] It is equipped with a device that forms a diagonal track using two rotary heads, and a plurality of time compression devices that time compresses a plurality of pieces of information. A magnetic recording device characterized by sequentially recording time-compressed signals.