JPS6089870A - Magnetic recording and reproducing method - Google Patents

Abstract

PURPOSE:To attain accurate recording and reproduction without overriding an information signal recording period part which is recorded already by recording a reference signal at least to one of margins among information signals to be recorded, and obtaining a gate signal corresponding to the information signal recording period based on its reproducing signal. CONSTITUTION:The reference signal R1 is recorded to the margin of a recording track. The reference signal R1 is detected by a magnetic head 120 in case of reproduction and its signal is inputted to a gate signal generating circuit 7 via a BPF14 and a detection circuit 15. The generated voice gate signal 3 turns on a gate G5 and a gate signal generating circuit 6 generates a video gate signal 4 so as to turn on a gate G6. The voice and signals detected by the magnetic head 120 respond respectively to gate signals 3, 4 and are inputted to voice and video reproducing circuits 17, 16. Similarly, the signal is recorded and reproduced accurately to a prescribed position without over-riding the recorded information signal recording period by conducting recording based on the gate signals 3, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a magnetic recording and reproducing method, and particularly to a magnetic recording and reproducing method of at least two information signals on a recording track.

[Prior Art] In magnetic recording and reproducing devices such as video tape recorders, advances in magnetic tape and magnetic heads have made it possible to record at higher density, and efforts have been made to reduce the feeding speed of magnetic tape and narrow the track. . On the other hand, due to a decrease in the feeding speed of the magnetic tape, the recording and reproducing characteristics of audio signals using conventional fixed magnetic heads may deteriorate. This problem can be solved by recording and reproducing audio signals using a rotating magnetic head. When recording audio signals with a rotating magnetic head, taking into consideration that after-recording can be performed as in the past, the video signal should be recorded on the recording rack 1ll111-, (high voice 1;
For example, pulse mark \JspeedyPJ (IX l・l'cl
time compression and recording using signal processing (called VI)
Law is adopted.

In order to separate the video signal and audio signal and reproduce them,
The winding angle of the magnetic tape is increased compared to the conventional one -C1,!l! The IK eye No. 5 River 1 - length is extended, and the increase in the end part is 1"~paper. It is configured so that it can record No. 111.

Figure 1 shows this J: sea urchin configuration and 11&! ,tCi'
- Figure C shows the recording track recorded on the disk.

In the figure, a magnetic tape 1 is formed by a rotating magnetic l\rad scanning in the direction of the arrow in the figure. Recording tracks 2 are sequentially formed. In fact, it is possible to extract the signal during playback ε) Easy 1:! To do this, each record 1~rack end J3 and a total of 114 records r=! It is necessary to provide a margin of 1 or more in jJibv61- between the recording period section A and the video signal recording section 111J.
- The signal above I is recorded, for example, in J as shown in FIG.

In the figure, the margin n at the beginning of the recording track is the part where the rotating magnetic head begins to come into contact with the magnetic tape, and the margin n at the end of the recording track is the part where the rotating magnetic head begins to separate from the magnetic tape. It is. Furthermore, a margin m is also provided at the boundary between the audio signal recording period section A and the video signal recording period section V. It is not advisable to make these margins unnecessarily large from the viewpoint of effective use of the magnetic tape, and they should be limited to about several H (H is one horizontal scanning period).

FIG. 3 is a diagram showing a method for recording audio signals and video signals on a recording track of a magnetic tape with a margin provided based on PG pulses. In the figure, the head drum 5 rotates in contact with the magnetic tape 1, and a rotation detector (hereinafter referred to as PG) of the head drum 5 generates a pulse (hereinafter referred to as PG pulse) indicating the rotational phase of the head drum 5. The gate signal generation circuits 7 and 6 generate the audio signal gate signal 3 and the video signal gate signal 4 shown in FIG. Niruru. The audio signal is, for example, video m (If you want to record something corresponding to the content of For example, the video signal is recorded as U corresponding to the gate signal 3 for the video signal.
Compatible with 'u'Ci! T! n Jru. That is, the sound i1T signal input from the input terminal 9 is guided to the audio signal processing circuit 11, the 1-G2 head 120, and is recorded on the magnetic head 120.

Also, It! inputted from input terminal F3! I! 1 (J) is guided to the magnetic head 12 via the video signal processing circuit rB10 and gate 01, and is recorded on the magnetic tape '1.

As described above, the audio is borrowed and recorded] 4;! Shinyumi is 11
After 1, the signals are recorded on 1 recording track with a slight margin as audio recordings 14 m interval ΔJj, . 1 hi video signal recording period part V. - Ondo I signal Goo 1 to Shinri 3 OJ: and Ei 6rI Yugogawa Goo Toi Goo 4 is based on the PG pulse, and is used for delay scanning or counter scanning of "Shi 7/Maru 1-". J is obtained as a series of pulse trains.

As described above, the recorded audio signal and l! ll
! When reproducing image signals, P
Based on the G pulse, pulses similar to the gate signal @3 for audio signal 8 and the gate signal 4 for video signal shown in FIG.
Alternatively, the audio signal and video signal are extracted and reproduced using a pulse slightly wider than the audio signal No. 8, gating signal No. 3, and video signal gating signal 4. The reason for using a wide pulse is to provide extra margin when there is a slight difference in the timing of the PG pulse during recording and playback, or when there is a slight difference in the delay selection of the monomulti due to temperature fluctuations, etc. It is for taking.

Now, when recording or reproducing the audio signal and II Shingetsu continuously on one recording track as described above, each signal is recorded or reproduced normally. However, on the recording track formed in this way, only the audio signal,
Or, if you are trying to re-record only the video signal by after-recording, do not include the other information 1 in the number recording period section.
II) :I:l I, f must be.

For example, + g l"(': r after 18-
1.When I started reading, the film 5" shown in Figure 2.
Video 11 No. 11 erased 1L zu 1 and 2 recorded in the section V between the j distribution 111J and γ while obtaining the playback screen from this part
8 pilgrimages in 1 voice! Record; Audio Lj to be newly recorded in 1-section 8
Insert month iid tP! 'There is a need to. At this time, the gate signal 3 for audio reliability is sent to the recording track I! i! Since the recorded information 1n is indirectly IC4Q from the PG pulse without combining it with 1), if the timing of the PG pulse is delayed from the time of recording due to the 11λ factor, the sound n Yuqq Yogou 1-F6 No. 3 is shifted to the right in Figure 2,
Video 13th 2f? , may get into the period part\/1
! 7ru. In this case, 2\(,1, part of Fukisei f3 will be erased, I7 /'i, jl, iF standard playback screen will no longer be available, 1+l /'a-)Ite.

[Summary of the invention 1 Therefore, the purpose of this invention is 1. By L1 after recording, Ei', R Nido 5...j
When a new information signal is inserted and recorded, it can be accurately recorded and played back in a predetermined area so as not to intrude into the space between the records 1 and 1 that have already been recorded on the rack. An object of the present invention is to provide a magnetic recording and reproducing method.

To summarize the invention, information signals are recorded by sequentially forming recording tracks on a magnetic tape by a rotating magnetic head, and at least 2 f.
! When a type i information signal is recorded separately with a margin section before and after it, a reference signal is recorded in at least one of the margin sections, and the reproduction signal of this reference signal is used as the basis. In this magnetic recording and reproducing method, an information signal gate signal corresponding to an information signal recording period portion is obtained.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

[Embodiment of the Invention] FIG. 4 is a diagram in which a reference signal is recorded in a margin on a recording track according to the present invention. That is, when recording, PG
Based on the pulse, the gate signal 3 for the audio signal is constant.
A reference signal self-loading signal is provided before the I interval, and a high frequency I signal of a constant frequency is generated during this pulse period, for example, '
I-I! ILIZ +a number (-recorded track q) 11.1. 26J '44 L,
4m8 like this M Q' 4r7 fJ RHJ two! Jru.

Fig. 5 shows the real distance B'l 4+ 71:
Li diagram-Hiaru.

In addition, in Figure 15, the 31st Kaoru r-I:iiJ 41
1/) A reference number is attached to the inspection report. Figure 4
3 b”C, usually U month 1 without after recording
1!1σ) 1 combination, gate G3 and gate G4 are
1 missing 1 jl; Put it in the playback side by means of 0 oki l, and also 8>” IR @ J log route signal 3 and gorge fil
1 signal for signal)] / 1 etc. Magnetic head'+ 2 (J+,:
This detected reference signal [<+l; For example, a pulse 1G signal is obtained from the reference signal @R1 by I-embelcoup detection.

Gate signal generation circuit 7: In response to the side pulses l, i l'J, after a certain number of questions, the voice signal goo I-4a k
Generate J3 and turn on gate G5, then 1.
: In response to the pulse signal of the gate 1 horoscope generation circuit 6, the gate signal 4 for the video signal is generated for a certain number of 1111 questions, and the gate G6 is turned on. In response to the voice signal gate signal 3, the voice 1 word is input to the voice signal reproducing circuit 17 via G1 to G5, and is reproduced and outputted from the output terminal 19. The video signal is also input to the video signal reproducing circuit 16 via gates G4 and G6 in response to the video signal gate signal 4, and is output to the output terminal 18.
Playback and output.

Next, for example, in the case of after-recording the audio signal, the output of the gate signal generation circuit 7 is connected to the gate G3.
to be connected to. At this time, the output of the signal generating circuit 6 is not connected to the gate 04G. At the starting end of the recording track 2, the Goo+-03 is placed in the playback side and set to playback mode, and the magnetic head 120 detects the reference signal R4 recorded on the recording I rack, as in the case of playback described above. , BPF14, detection times f
A pulse signal is obtained via i15. In response to this pulse signal, the gate signal generating port jB7 generates a gate signal 3 for an audio signal for after-recording for a certain period of time (see table).
is input to G1 to G3, and turns gate Q3 into the recording side. At this time, the timing of occurrence of the voice example S] Kawayo Gushin@3 is adjusted so that it almost coincides with the original recording time. If this J: is set, the high-pitched signal input from the input terminal 9 will be processed by the audio signal processing circuit 11,
The signal is guided to the magnetic head 120 through gates 0:3, and an audio signal can be inserted and recorded at almost the same location during recording.

Therefore, the continuous video signal recording I'l1 is not affected. 4] Since the information on the original recorded information signal can be obtained directly from the recording track,
The above-mentioned PG pulse number: can be indirectly removed to 1r# signal gate signal by 1+i:(<+).

Note that when recording PCM (PCM borrow) as an audio signal, a normal clock run-in (clock +/old +-In) signal is recorded before the data area of I) CM lff1. In other words, since a clock run signal is recorded at or just before the start of recording interval A, this is set for a certain period of time, and during after-recording, this is used as the reference signal. R5
It is also possible to use it as a substitute.

Also, when performing after-recording of a video signal, the video signal gate signal 4 may be generated based on the reference signal R5. In this case, the timing of the video signal gate signal 4 can be adjusted so that it almost matches the original recording timing, so when the video signal gate signal 4 comes too early during after-recording, the recorded audio signal will be recorded. It does not cut into the rear part of the period section.

In the above description of the embodiment,! ! This was done for the case where the quasi-signal F3 R+ was recorded on the eave of the margin at the start of the recording track, but the reference signal R2 or R6 was recorded on the other margin ■ or n.
It goes without saying that even if the data is recorded, the gate signal for the information signal at the time of after-recording can be similarly created based on this.

In addition, in the above description of the embodiment, the two information signals recorded on one recording track were an audio signal and a video signal. The present invention can also be applied to 11, t, which records two or more information signals ε, 1. L I/J theory i) II
I.

[Effect of the invention] As described above, according to the present invention, when a new portrait signal is inserted into the recording 1.'L <, 1: 1 after-recording and recorded. Based on the standard recorded in advance on the surplus area on the recording track (based on the re-nid signal of No.
Information corresponding to the F1 record clear section A: Goo goo for January f, 'i issue is set to 19, so it will not fit into the already recorded 1i'i information record period section. ((t 1?N, 1ljIfr, ilJl air distribution can be regenerated.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing recording tracks recorded on a magnetic tape. Figure 2 shows one letter Lnl・U・Nino 1 and i'3
1'atan and video fishing signal minutesn [shiten(:record/:,
, ,lr,J,! In 'i'! , without showing the vessel. FIG. 3 is a diagram showing a method of recording audio signals and video signals with margins provided on a recording track based on PG pulses. FIG. 4 is a diagram in which a reference signal is recorded in a margin on a recording track according to the present invention. FIG. 5 is a diagram showing an embodiment of the present invention. In the figure, 1 is a magnetic tape, 2 is a recording rack, 3
4 is the gate signal for the audio signal, 4 is the gate signal for the video signal,
5 is a head drum, 6.7 is a gate signal generation circuit, 12
．． 120 is a magnetic head, 14 is a band pass filter, 1
5 is a detection circuit, G3°G4. G5. G6 is a gate, A is an audio signal recording period section, ■ is a video signal recording period section, and I
II and n are margin parts, and R+, R2, and Rs are reference signals. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Procedural amendment (voluntary) 1/7/2019 Mr. Commissioner of the Japan Patent Office 1, Indication of the case, Patent Application No. 197795 1987, 2, Invention Name of magnetic recording and reproducing method 3, Representative Hitoshi Katayama of the person making the amendment Part 5, Detailed explanation of the invention in the specification subject to amendment 6, Contents of the amendment Page 5, lines 19 and 20 of the specification Correct "scan" to "operate". that's all

Claims (3)

[Claims] (1) A rotating magnetic head is configured to record J (by sequentially forming recording tracks on a magnetic tape), and at least 211 types of information signals are recorded on the recording tracks. 411 is constructed so as to provide an extra section at the front and rear for separate recording, and magnetic recording/reproduction II
At the position I, a reference signal is recorded in advance in at least one of the margins, and the ! A magnetic recording and reproducing method characterized in that a gate signal corresponding to a recording period portion of the information signal is obtained based on a reproduced signal of an STS signal. (2) III? kl! fn@, 4HN (1) 1
') /JK/(A/ SiJ Fj WIN signal, wherein the reference signal is a clock run-in signal of a certain period provided at the beginning ## of the 斡-information signal. Claim 1￥11 Magnetic recording and reproducing method described in section lk! (3) The magnetic recording and reproducing method according to claim 1, wherein the at least Class 21 information signal is a video signal and an audio signal.