JPS6040573A - Recording system of information signal - Google Patents

Abstract

PURPOSE:To increase the interleave per one CH by converting the digital source sound signal of 4 CH into interleave and channel codes every 2 CH to obtain the interleaved sound signals of 8 CH and recording these sound signals distributed into eight tracks respectively. CONSTITUTION:Sound signal recording track parts Ta and Tb are provided at both sides of a video signal recording track part Tv. The digital source sound signals A1 and A2 of the 1st and 2nd CHs are interleaved and at the same time converted into channel codes to obtain interleaved sound signals A'12-A<4>'12 of 4 CH. These sound signal are recorded to the parts Ta and Tb in the form of signals A'12-A<4>'12 and A'34-A<4>'34. Thus parallel digital signals of 2 CH and 8 bits are obtained. In such a way, the interleaved sound signals of 8 CH are allotted and recorded distributing into eight sound signal recording track parts. Thus the interleave length can be increased per one CH.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information signal recording method suitable for application to a digital VTR in which a video signal and an audio signal are recorded on the same recording track.

BACKGROUND TECHNOLOGY AND PROBLEMS First, with reference to FIGS. 1 and 2, the information signal recording system used in digital VTRs of this type since 1TT will be explained. Figure 1 shows the arrangement of the rotating magnetic head of a digital VTR, where DR is a tape guide tram, which is composed of a fixed top drum and a rotating top drum, and its rotation speed is 1.
．． Each rotary magnetic head 11 is attached to the F ram. lfA to HD are rotating magnetic heads for recording.
, Hi to H,) is iQ: rotating magnetic head for cattle. The recording rotary magnetic heads Hc and HB are arranged close to each other, and the azimuths of the gaps are different, and the recording rotary magnetic heads Hc and Ho are also arranged close to each other. The gears have different assistance. Similarly, ] 11 regenerative river air head 11
Person, ■■6 and H6, H54) respectively j! L and C are arranged in contact with each other, and the azimuths of the gaps are different. Also, the straight line connecting the recording rotary magnetic heads HA, Hii and Hc, tlo and the straight line connecting the reproducing rotary magnetic heads H, +16 and tlc, l16 are 17.
It is arranged perpendicular to the Then, the inclined recording trunk recorded on the magnetic tape by the recording rotary magnetic heads HA to I (D) is scanned by the corresponding reproduction rotary magnetic heads H to H6, so that the recorded signals are repopulated. is being done.

Although not shown, the magnetic tape is wound around the tape guide drum DR at a predetermined angle of 180° or more.

FIG. 2 shows such a recording rotary magnetic head HA-H.

By changing the pattern of recording tracks in the area 41 formed by
Similarly, the following recording tracks T6 to T6 are also recorded by the recording rotary magnetic heads HA to Ho.

These recording tracks TA-T[) and T6 to T6 each consist of a video signal recording track section Tv and two audio signal recording track sections Ta and Th provided at one end thereof.

In each video recording track section Tv of the recording tracks TA, TB and Tc, TI, there are channel-coded odd field digital video signals v', V'' and even field 1' digital video signals, respectively. ■'', V''' are respectively recorded °ζ.Furthermore, the audio signal recording track portions Ta and Tb of the recording tracks TA and TB have the digitized first and second channels and third and third channels, respectively. 4 channels of audio signals Al, A2 and A3, A4 are German
'i, is recorded.

! In a conventional digital VTR, the interleave L of the digitized audio signal of each channel is
・Rank audio signal recording I ・Since the interleaving length is limited to the rack section, if you try to increase the interleaving length, it is necessary to interleave the digitized audio signal on multiple tracks with zeros and record it. Ta.

In view of the above, the present invention forms a plurality of recording ranks on a magnetic tape consisting of a video signal recording trunk section and an audio signal recording trunk section located at the end thereof. This paper attempts to propose an information signal recording method that can lengthen the interleave length per channel of multiple channel audio signals in an information signal recording method that records video signals and audio signals of multiple channels. It is something.

Invention l1lI19! The information signal recording method according to the present invention is such that N (plural) recording tracks consisting of a video signal recording trunk section and an audio signal recording track section located at the end of the video signal recording trunk section are simultaneously formed on a magnetic tape. In an information signal recording method that records audio signals of M> channels, the original audio signal of M channels is interleaved for each predetermined channel to obtain an interleaved audio signal of M×N channels, and this interleaved audio signal of MXN channels is obtained. The audio signals are recorded by being distributed to a plurality of audio signal recording track sections.

According to the present invention, in this type of information signal recording method,
It is possible to obtain an information signal recording method that can increase the interleave length per channel of audio signals of multiple channels.

Embodiment An embodiment of the present invention will be described below with reference to FIG. 3. In FIG. 3, parts corresponding to those in FIG. In the embodiment shown in FIG. 3, in each recording 1-rack TA-T, T6 to T6, there is a video signal recording track section Tv and an audio signal recording rack section Ta disposed on both ends thereof. , Tb are provided. Then, the digital original audio signal A+ of the first and second channels
, A2 and channel-coded to obtain a 4-channel interleaved audio signal A'.
12, A'; 2, A'r2, A': "Obtain x and record traso, respectively') T A ,.

Each audio signal recording of Ts] - Each audio signal recording track section Tb of rank section Ta and one recording track Tb is recorded. Also, the digital original audio transmission of the 3rd and 4th channels.”
tA 3 and A 4 are interleaved and channel coded to obtain 4-channel interleaved audio signals A'34, A'S<, Als+,, A"i2
and are recorded in each audio signal recording track portion Ta of recording l and ranks 'rc and 'rD and in each audio signal recording 1-rank portion Tb of recording tracks r6 and r6, respectively.

Next, referring to FIG. 4, a digital VT to which the present invention is applied
An example of R will be explained. Note that this digital VTR has an editing function. In the figure, the RK4J recording system is
indicates a re-fastening thread. First, the recording system RK will be explained. 1st~
Analog audio signals A1 to A'4 of the fourth channel are A/
It is supplied to a D converter (1) and digitized. The digitized four-channel audio signals are fed to a parallel-to-serial conversion circuit (3) via a changeover switch (2), which will be described in detail later, and are converted into 8-bit parallel digital audio signals.

These 4 channels of 8-bit digital audio signals are supplied to an error correction IF encoding circuit (4), where they are ζ encoded, and then supplied to an interleave circuit (5) where they are interleaved and channel coated. 8-bit parallel digital audio signals of the channels are obtained and supplied to address adding circuits (6A) and (6B), respectively. Parallel 8-bit digital audio signal obtained from address addition circuits (68) and (6B) 8-12 code conversion circuit (7A)
, (7B) and obtained parallel 12-bit digital audio input! No. 1 is speed conversion time 1#i (8^), (
8B) to obtain a parallel 8-bit digital audio signal. Then, the parallel 8-bit digital audio signals αA, αC obtained from the ζ speed conversion circuit (88) are sent to the recording rotary magnetic heads Hp, -, HC through the video signal channel encoding circuit. The parallel 8-pip 1-digital audio signals αB and α0 obtained from the speed conversion circuit (8B) are respectively supplied to the recording rotary magnetic belly button FTIR 1HD via the video signal channel encoding circuit. Incidentally, the digital audio signals αA to α supplied to the recording rotary &f air head f (A to Ho) are recorded in the audio signal recording trunk portion Ta when recording the recording tracks TA-T[), respectively. It includes the interleaved digital audio signal to be recorded in the audio signal recording trunk section Tb together with the interleaved digital audio signal of each channel described above. Similarly, when recording tracks T6 to T6, 4j, digital audio signal αA to
The contents of αo include the interleaved digital audio signal to be recorded in the audio signal recording track portion Ta and the above-mentioned interleaved digital audio signal to be recorded in the audio signal recording trunk portion Tb.

Next, the reproduction system PK will be explained. The parallel 8-bit digital audio signals αA to α0, which are reproduced by the 14 rotating magnetic heads for reproduction and passed through the video signal reproduction circuit (not shown in the figure), are the digital audio signals αA and αC.
is supplied to one time base collector (9A), and the other digital audio signals αB and α0 are supplied to the other time base collector (9B). Time base collector (9A)
The two-channel parallel 8-bit digital audio signal obtained from , (9B) is processed by the parallel-to-serial conversion circuit I? 80m and converted into a serial signal. The one-channel serial digital audio signal obtained from this is sent to the synchronization detection circuit (11).
The signal is supplied to the serial-to-parallel conversion circuit (12) through the signal line, and is converted into one channel of parallel 12-bit digital audio signals. The obtained one-channel parallel 8-bit digital audio signal is supplied to a dinterleave circuit (15) through an address reproduction circuit (14). The parallel 8-bit digital audio signal obtained from the dinterleaving circuit (15) passes through an error correction circuit (16) and an error correction circuit (17) to a ζ memory (FIFO memory) (18) 43 (
be provided. The 4-channel parallel 8-bit digital audio signal obtained from the memory (18) is supplied to the parallel-to-serial conversion circuit (19), where it is converted into a 4-channel serial digital audio signal, and its output is sent to the D/A converter. (20), analog audio signals A's-A'4 of the first to fourth channels of °ζ are obtained.

In addition, for editing, the 4 channels of parallel 8-bit digital audio signals read out from the memory (18) are supplied to the parallel-to-serial conversion circuit (21) and converted into °ζ serial signals. The channel serial digital audio signal is switched to the 4-channel digital audio signal from the ζ A/D converter (1) by the changeover switch (2),
The serial-to-parallel converter 1i (31) is configured to be over-fed.

When editing on such a digital VTR,
The reproduced analog audio signal A't''A'4 obtained from the reproduction system PK is generated, and this is sent to the recording system RK via the changeover switch (2).
At a desired time, the changeover switch (2) is switched to the A/D converter fil side to switch to a new four-channel audio signal and record it.

Next, another embodiment of the present invention will be described with reference to FIG. 5. In FIG. 5, parts corresponding to those in FIGS. 2 and 3 are given the same reference numerals, and redundant explanation will be omitted. In the embodiment shown in FIG. 5, the 8-channel interleaved audio signals A'12 to AT2 created from the digital original audio signals A1 to A4 of the first to fourth channels as in FIG. 3 are as follows. recorded on the recording track. That is, recording track T
ACT.

The interleaved audio signals A'12, A';2, A'34, A'64 are recorded in the lower audio signal recording track portions Ta.
are recorded, and interleaved audio signals A112, A T'2,
This is to record AT4 and A14%.

According to the information signal recording method of each embodiment described above, 4 channels of digital original audio signals are interleaved and channel coded every 2 channels to obtain 8 channels of interleaved audio signals, and the 8 channels of interleaved audio signals are Since the data is distributed and recorded into a plurality of audio signal recording tracks f(1), that is, 8111++, the interleaving length per channel can be increased.

Furthermore, the interleaved audio signals of the 8 channels are recorded in the audio signal recording l/rank sections provided at both ends of each recording trunk so that the audio signals of each channel are equally distributed. When recording an M collection, the already recorded interleaved audio signal on one end side is mistakenly erased (ζ1), and this can be reproduced using the interleaved audio signal on the other end side.

In addition, in the two-part embodiment, 'ζ interleaved the first and second digital original audio signals 14, and interleaved the third and fourth digital audio signals 13; The combination is arbitrary. Further, the number of channels of the ring digital audio signal can be any number (plurality) such as 2 channels.

According to the present invention, a plurality of video signals and a plurality of recording tracks are simultaneously formed on a magnetic tape, each consisting of a video signal recording track portion and an audio signal recording track portion located at the end of the video signal recording track portion. In an information signal recording method that records the audio signal of a channel, one of the audio signals
An information signal recording method that can increase the interleave length per channel can be obtained.

[Brief explanation of drawings]

FIG. 1 is a layout diagram showing the arrangement of a rotating magnetic head of a digital VTR suitable for applying the present invention, FIG. 2 is a recording track pattern diagram for explaining a conventional information signal recording system, and FIG. 4 is a pattern diagram showing a recording track pattern for explaining one embodiment of the present invention, FIG. 4 is a block diagram showing an example of a digital VTR suitable for applying the present invention, and FIG. 5 is a pattern diagram showing another example of a digital VTR according to the present invention. It is a pattern diagram showing a recording track pattern 3 for explaining the embodiment. ) is the audio signal recording track section. 4 JP-A-Sho GO-40573 (6)

Claims (1)

[Claims] Video signals and audio signals of multiple (M) channels are simultaneously formed on the magnetic tape by N (plural) recording I-racks each consisting of a video signal recording track section and an audio signal recording track section located at the end of the recording I-rack. In the information signal recording method, an M channel original audio signal is interleaved for each predetermined channel to obtain an M×N channel interleaved audio signal, and the MXN channel interleaved audio signal is recorded on a plurality of audio signal recording tracks. An information signal recording method characterized in that information is recorded in sections.