JPS58206284A - Recording system - Google Patents

Abstract

PURPOSE:To reduce further the number of samples which constitute an editable unit, by recording on a tilt magnetic track so that the adjacent part of a digital audio signal of the 5th and 1st subcycles of an adjacent main cycle is separately reproduced. CONSTITUTION:Digital video signals for one field are recorded on a video track part TV of one line of a tilt magnetic track T. Digital audio signals for the main cycle of 2002 samples are set as a unit corresponding to digital video signals for 2.5 fields, and recorded on an audio track TA of the tilt magnetic track T. For every five fields of digital video signals, namely for every five lines of tilt magnetic tracks, the recording is performed via a guard band (g) so that adjacent part of digital audio signals of the 5th and 1st cycles of an adjacent main cycle can be reproduced separately. Also, the waveform of a controlling signal CTL is made different from others so that a pulse P and pulse P' can be reproduced separately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording method for recording NTSC digital video signals and related digital audio signals on a magnetic tape so as to form inclined magnetic tracks in a digital VTR.

Conventional digital VTRs use a rotating magnetic head to record NTS
C method (number of set lines is 525, vertical frequency is 5QHz)
) is recorded on a magnetic tape by forming a tilted magnetic track, and a digital audio signal that is informationally related to the digital video signal is recorded near the end of the tilted magnetic track. ing.

Incidentally, there is a movement to select the sampling frequency of the digital audio signal to 48 KHz (an integer number of samples are exactly equal to one five frames of the NTSC digital video signal).

The main period is 8008 samples of the digital audio signal with a sampling frequency of 43 kHz, which is 1602, 1601, 1602, 1601.
, 1602 samples of the first . Second. Third. The digital audio signal is divided into the fourth and fifth sub-periods, and the digital audio signal for the main period of 8008 samples is recorded on the inclined magnetic track on the magnetic tape in correspondence with 5 frames (=10 fields) of the digital video signal. In this way, a recording method has been proposed that enables electronic editing in units of five frames of a gradient magnetic track of a digital audio signal.

However, this recording method has the disadvantage that the unit that allows electronic editing of the digital audio signal is 5 frames, which is quite long.

The digital signals for the two main periods are 41j, respectively 8 (11, 801, 800).

801, the first 801 samples. Second. Third. Fourth
' and a fifth sub-period, and record the digital audio signal corresponding to the main period of 4θ04 samples on the inclined magnetic track on the magnetic tape in correspondence with five fields of the digital video signal as a unit, A recording method has been proposed that enables electronic editing of digital audio signals in units of five fields of a gradient magnetic track.

However, this recording method also has the disadvantage that it is still too long because the unit that makes it possible to electronically edit digital audio signals is five fields.

In view of the above, the present invention provides a system in which an NTSC digital video signal is combined with a digital audio signal having a sampling frequency of 43 kHz, which is informationally related to the digital video signal, so as to form a sloped noise track on a magnetic tape. The present invention aims to propose a recording method that can reduce the number of samples of a digital audio signal by using the NTSC method for one field. A digital video signal is recorded on a magnetic tape by forming 2N20 inclined magnetic tracks together with a digital audio signal that is informationally related to the digital video signal, and the sampling frequency of the digital audio signal is y, 3
43KHz and 800KHz of digital audio signal.
The first 8 samples are divided into 2002 samples each. Second.
Divided into the third and fourth main periods, the digital audio signals for each main period are 400, 401, 400, respectively.
401, the first 400 samples. Second. Third. Fourth
and the fifth sub-period, and the digital audio signal for each main period is divided into 2.5 parts of the digital video signal.
At the same time, adjacent parts of the fifth and first sub-period digital audio signals of the adjacent main period are recorded on the ode f+ magnetic track in correspondence with the 5th field of the digital video signal. It is recorded so that it can be played back separately.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below. 1st
・The 5th step is to use the rotating magnetic head of a digital VTR to transfer one field's worth of NTSC digital video signals onto a magnetic tape to form a 9-bit track. This is a case where a digital video signal is recorded together with a digital audio signal that is informationally related. 1st
In the figure, TP is a magnetic tape. T is a tilted magnetic track, long video track section TV and guard band g
? There is also a short audio track section TA disposed at the rear thereof. CTL is a control signal recorded on the side edge of the magnetic tape TP corresponding to each inclined magnetic track T.

Next to the ode, ii'+a key → track T, a digital video signal of 17.r-rd is recorded in the video track portion TV. Then, the digital audio signal for the main period of 2002 samples is recorded on the audio track portion TA of the tilted magnetic track T along with 2.5 fields of the digital video signal for each pair C''A.r1~
T5 indicates a tilted magnetic track that runs next to Namiji. The digital signals for the first and second sub-periods of the main period located at the lower end in the figure are recorded in the audio track section TA of the inclined magnetic track T1, and the next inclined track '#im' is recorded. Record T2 audio signal and tilt @ki track T3
In the diagram of the audio track section TA, the digital audio signal for the fifth sub-period of the same main period is shown at the bottom i1+1, and the digital audio signal for the first sub-period of the next main period is shown above. In order to be able to play it back separately, the second and third m1 of the same main period are recorded in the audio track section TA of track T4 from bottom to top. Record the digital audio signal for the period, and write the digital audio signal for the fourth and fifth sub-period of the same main period on the lower half of the audio track i TA K m of the inclined 5-ki track T5. Record this below in the digital version of the 4th cycle:
Reply to the r signal with tweets and songs. For every 5 fields of the digital video signal, every 5 fields of the digital video signal are separated and played back from the adjacent part of the digital audio signal of the main period and the first sub-sync. along with recording via the guard band g so that it can be
The waveform is made different so that the control signal CTL in this part (corresponding to the magnetic track T3, but it may also be in another magnetic track, for example, in the position 'r1) can be used.

Alternatively, digital audio signals for two sub-periods may be recorded in the audio track section TA of all the inclined magnetic tracks T via the card band g.

The embodiment shown in FIG. 2 is a digital audio signal that is informationally related to a digital video signal, such that one field of NTSC digital video code is formed into five inclined magnetic tracks on a magnetic tape. In FIG. 2, TP is a magnetic tape. T is a tilted magnetic track, long video track part TV and sword -
It consists of a short audio track section TA placed on the head of the audio band g. CTL is inclined magnetic track T
For each tilted magnetic track T, which may be a control signal recorded microscopically on the magnetic tape TP corresponding to each of the following, digital and digital signals for 1Z field are recorded on the video track TV. . Then, the main period of 2002 samples is recorded on the magnetic track section TA of the inclined magnetic track T in correspondence with 2.5 fields of the digital video signal. do. The audio track portion TA of each magnetic track T is provided with digital audio for a total of 2.5 sub-periods, each corresponding to 1.25a period of the main period, via the guard band g on the lower-1 and upper sides of the figure trap. Record the first word. Then, if every 5 fields of the digital video signal, that is, every 255 fields of the gradient magnetic track, the 5th main period and the 111th soft period of the magnetic track are adjacent to each other, the adjacent parts of the video signal will be split and reproduced. In addition to recording the control signal CTL in this part, the pulse P and its waveform are smoothed over the pulse PK of the J track section.
6 (,.

Furthermore, as shown in Figure 3, the Ode f/r track section of each oblique magnetic track section T is provided with guard band gt valves on both ends of the hitten track section, dividing it into TA and TA'. However, it is also possible to make the signals corresponding to the respective gradient magnetic tracks T of the control signal CTL different; however, it is also possible to use digital signals with different codes. Just as a video signal is formed into a rigid magnetic track on a magnetic tape, the sampling frequency V, which is related to this digital video signal, is 43K.
In the self-recording method that records together with the Hz digital audio signal, it is possible to obtain a digital audio signal that can reduce the number of samples of the digital audio r signal in units of 0.

[Brief explanation of the drawing]

Figures 1, 21, and 3 are magnetic tape recording pattern diagrams showing examples of each Meikyuu in Honbatsu Town. TP is a magnetic tape;
T is a stubborn magnetic track, TV is a video track section, T
A is the audio track section. A Written amendment to the procedure by Chikara Kuma dated November 1, 1981 1. Indication of the case Patent Application No. 90369 of 1988 2. Name of the invention Recording method 3. Person making the amendment 1 Cow and 0 Seki 1 system Permit '9 [JI Address: Tokyo Parts District ≦ Hi-Parts 6-7-35 Name 218 Sony Corporation Representative Director Noriyoshi Ohga 4, Acting! (Kfi', 1-8-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 03343-5821
Representative 3388 Patent Attorney Tei Ito 5
, date of amendment order: Showa year, month, year, number of inventions increased by 17, subject of amendment: Akira#ld
Column for detailed description of the invention (1) Mingsei Lou Junior High School, 9m6
Lines ~ Lines 8 “1.25 sub-periods of main and 1...t
￥'er. ” is corrected to be missing. ``1 digital audio signal with 0.2 sub-circumference
P@shi, one sub-day's worth of digital emergency data is created with two auto-track autopsy TA and the upper fi11 or lower side of one auto-track section TA. "that's all

Claims (1)

[Claims] recording an NTSC digital video signal for one field on a magnetic tape together with a digital audio signal informationally related to the digital video signal so as to form 2N+1 (N22) inclined magnetic tracks; Set the sampling frequency of the above digital audio signal to 43
8 KHz of the above digital audio signal.
008 samples to the first 2002 samples each. Second. The third and third periods are divided into main periods, and the digital audio signals for each main period are respectively divided into 4 +, 401,
□↓00.401, the first of 400 bumps. Ditch 2
．． Third. Is the digital audio signal divided into 4 and 5111 cycles, and the digital audio signal for each of the above-mentioned king cycles? The recording is recorded on the inclined magnetic track in correspondence with 2.5 fields of the digital video signal, and the inclined magnetic track of every 5 fields of the digital video signal is recorded with the 2.5 fields of the adjacent main period. A recording method characterized in that adjacent parts of a digital audio signal in the fifth and first sub-periods are recorded so that they can be reproduced separately.