JPH01100706A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To obtain a medium with a satisfactory characteristic by forming one sub information signal track on each extension line of a main information track. CONSTITUTION:A video track 112 is formed by recording the (N+1)-th field of a video signal by a head 213 for a second ch, and an audio track 123 is formed by separating one field period of a corresponding audio signal in the neighborhood of the video signal to two PCM recording signals and recording it by the SP head 213. Following that, an audio track 124 is formed by recording the PCM recording signal by overwriting on a part (left half) of the audio track 123 by an EP head 214 having a gap azimuth angle different from that of the SP head 213. Thus, the tracks after the video track 113 are formed and the audio tracks after an audio track 125 on the upper parts of those tracks. In other words, every audio track is formed on the upper side of each video track. In such a way, it is possible to obtain a characteristic with sufficiently high definition.

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a magnetic recording/reproducing device r! L (hereinafter referred to as rVTR).

In particular, it relates to the main information signal (hereinafter also referred to as "video signal 1") on the extension line of the main information signal (hereinafter also referred to as "video signal 1") track. Since the description will be made using an audio signal as a representative example, the present invention relates to a VTR capable of recording/reproducing an audio signal (hereinafter also referred to as "audio signal 1").

[Conventional technology]

Home VTRs are increasingly being equipped with a system in which the audio signal is FM modulated and frequency multiplexed with the video signal for recording, and a system in which deep recording is performed in the thickness direction of the tape.

However, this method cannot be said to be sufficient in terms of quality such as continuity for each field, band, and S/N.Therefore, so-called PCM, which converts audio signals into digital codes and records and plays them, is used. It is beginning to attract attention as a method that can reproduce high-quality audio in the truest sense. If it is “8mm”
In the case of a small home-use VTR called ``Video,'' the winding of magnetic tape (hereinafter simply referred to as ``tape J'') around a rotating drum increases the angle from the standard angle of 180°, and A method is being adopted in which band-compressed digital audio signals are recorded and reproduced in units of one field.

A conventional VTR of this type will be explained with reference to FIG. 12 and subsequent figures. FIG. 12 is a block diagram of a conventional VTR in which the above-mentioned system is used as a PJ.
) ch (channel) and right (R) channel audio signal input terminal, 2 is an audio signal recording processing circuit for performing time axis multiplexing, time axis compression, etc. after sampling both audio signals respectively, 3 is a magnetic head 4 is a recording amplifier for supplying an appropriate recording current to the head (hereinafter simply referred to as the "head"); 4 extends the time axis of the audio signal reproduced from the head, and separates the original audio signal into the R channel audio signal; An audio signal reproduction processing circuit 5L performs signal processing such as.

5R is an Lch and Rch audio signal output terminal, respectively, and 6 is a changeover switch. Further, 7 is an input terminal to which a video signal as an example of a main information signal is supplied, and 8 is a luminance signal and a color signal that are separated from the input video signal, subjected to frequency modulation and low frequency conversion, and then synthesized again. 9 is a recording amplifier for supplying the video signal to the head at an appropriate level, 14.17 is a changeover switch, and 15 and 15A are □ playback circuits that amplify the signals played back from the tape. Amplifier 18 is a video signal reproduction processing circuit for demodulating the frequency-modulated luminance signal, converting the low frequency-converted color signal to the original frequency, etc., and returning the reproduced signal to a video signal. , 19 is a reproduced video signal output terminal, 20 is a head switch pulse generation circuit that controls the changeover switches 6 and 17, and 21 and 22 are for recording the video signal and audio signal on the tape 40, or for recording these already recorded signals on the tape. 1.40 for reproduction. a second magnetic head, 23, these magnetic heads 21.22;
24 is a rotation detector for detecting the rotational phase of the rotating drum 23 (hereinafter also simply referred to as "drum").

As shown in this figure, the tape 40 is attached to the rotating drum 23.
In contrast, the standard winding is wound more than 180 degrees (for example, 36 degrees) and runs diagonally at a predetermined angle, so that the heads 21 and 22 form recording tracks diagonally with respect to the tape 40. During reproduction, if the heads 21 and 22 have different azimuth angles, signals are reproduced while being alternately traced with heads having the same azimuth angle as that used for tracing during recording.

FIG. 13 is a signal waveform diagram (timing chart) for explaining the recording and reproducing operations of the conventional device.

FIG. 14 is a principle diagram showing the recording pattern (track pattern) on the tape 40. Figure 13(A).

(B) is an analog audio signal waveform diagram of Lch and Rch, respectively, and (C) is an analog audio signal waveform diagram of both Rch and A.
/D conversion Conversion 1 Anatomy audio signal, Figure (D) shows the video II4 signal waveform diagram, Figures (E) and (F) show the timing at which the digital audio signal and video signal are recorded by the heads 21 and 22, respectively. figure,
Figure (G) shows the switching pulse waveform for the heads 21 and 22. More specifically, the timing at which the digital audio signal is recorded on the tape 40 is determined by the timing at which the digital audio signal is recorded on the tape 40.
1 or 22 is when scanning the angular range shown by a in FIG. 12, that is, the angular range of the part where the tape 40 is wrapped around the rotating drum 23 by more than 180°. In this way, the audio signal is transmitted to the lower end of each magnetic track from AI+A2, A3 . ... forms a magnetization pattern. Since the video signal is recorded in the angular range of V (180") shown in FIG. 12, the video signal is recorded on the tape following the audio signal. In this way, the first and second Audio signals and video signals are supplied to the magnetic heads 21 and 22 of No. 2 in the relationship shown in FIG. 13 (E) and (F), respectively, and the video signal follows the audio track as shown in FIG. 14. Video track P 1
, P 2 + P 3 r... to form a pattern with the magnetic f.

[Problem that the invention seeks to solve]

However, in a conventional device configured to record/playback an audio signal continuously on an extension line of one video track, and with one audio track formed in the increasing range of corners, the winding The angle shown is increasing angle (36° for 8 mnVTR)
) was also naturally limited, so it was not possible to increase the recording density that much.

Furthermore, when trying to apply the above method to current home VTRs such as the VHS method, there is a limit to the increase in the angle of wrapping due to compatibility reasons. #J However, if you try to increase the recording capacity by significantly increasing the winding angle without considering compatibility, the tape (or drum rotation axis)
It would be better to increase the inclination angle and increase the tape speed, but in this case, the disadvantage is that the recording time of the tape used is shorter than that of standard recording. Therefore,
In conventional VTRs, in order to record digital audio signals, the tape is wound 36 degrees more than before, and the same number of audio tracks as the conventional magnetic tracks are formed while recording. 2 during A/D conversion
Sampled at XfH (31.5kHz), 10b
It is best to compress the data into 8 bits and record it.
However, it had the disadvantage that it had insufficient characteristics for It i Fi audio, which requires a frequency band of nearly 20 kHz and a dynamic range of 80 d8 or more.

[Means for solving problems]

In the magnetic recording/reproducing apparatus of the present invention, the tape loading mechanism is configured to wrap the magnetic tape around the surface of the rotating drum at an angle greater than the standard angle, and when recording in the standard mode, one of the pair of SP heads is configured. M quasi-wound magnetic tape is carried out with the SP head to form a main information track in an angular range, and then the same SP head is used to wrap a second part of the magnetic tape on an extension of the main information track and with a larger number of wraps. 1 sub-information track is formed, and then the SP of the EP head is
The first EP head has an azimuth angle different from that of the head.
By overwriting and forming a second sub-information track on a part of the sub-+11191 track, a plurality of sub-information tracks are formed on an extension line of one main information track. However, when recording in long-term mode,
A pair of EP heads alternately wraps the magnetic tape according to the WA standard, with the main information track in the angular range, and the same EP on the part of the magnetic tape that is wound a larger amount on the extension line of the main information track.
The various drawbacks of the above-mentioned conventional devices are solved by forming sub-information tracks with the head, and by forming sub-information racks one by one on the extension line of one main information track. It is something.

〔Example〕

Without reference to FIGS. 1 to 4, the magnetic recording/
A first embodiment of the playback device will be described.

In the following explanation, a video signal is used as the main information signal.
It is assumed that a digitized audio signal is used as the sub-information signal. FIG. 1 is a block configuration diagram of a first embodiment of the device of the present invention. In this diagram, the same components as those of the conventional device shown in FIG. In the 0 figure, 403, 404, 425, 4
26 is LPF (low pass filter), 405 is A/D converter, 406.420 is data bus, 407, 421 is F
t A M (Random Access Memo
ry), 408 is a format encoder, 409 is a modulator, 410 is a REC/Pa (recording/playback mode) switch, 412 to 415 are selection switches, 30 is a video signal processing circuit section, 49 is a signal switching section, 55 is a Signal switching control unit, 416 is 61j1 unit, 411 is jitter memory, 418 is PLL (Phase Locke)
d Loop), 419 is a tarok generation circuit, 422
423 is an error correction circuit, 423 is a correction circuit, and 424 is a D/A converter.

Further, FIG. 2(^) shows a rotating drum (hereinafter also simply referred to as "drum j") 200 applied to the first embodiment of the present invention.
(8) is a plan view of the drum 20 (rotating head 50).
This is a side development view of the drum 20G, and arrows C and B in FIGS. Of course, the intersections X and y of the sides of and the bisector 1i1&l are 180°
MrWI is located at an angle of
The SP head 211 (for standard mode) and the 2nd channel EP head 212 (for long time mode such as 3x), which is a head for recording/reproducing sub information, are arranged close to each other, and the intersection point y
Nearby, a second channel SP head 213 and a first channel EP head 214, which is a head for recording/reproducing sub information, are arranged in close proximity. Regarding the relative positional relationship in the height (rotation axis of the drum 20G) direction of these magnetic heads 211 to 214 and the audio head 215, as shown in FIG. The SP head 211 and the EP head 211 and
14 is +6°, 2nd channel EP, SP head 212,
It is advantageous to provide 213 with a gap azimuth angle of 16 degrees to ensure compatibility with conventional VTRs. Furthermore, among these heads, one pair of SP heads 211
, 213 are formed to have a standard head width and are normally used for recording or reproducing video signals in FFA quasi-mode, and
A pair of EP heads 212 and 214 are connected to the SP head 211,
If the rotary head 50 is formed with a head width approximately half of that of 213 and is configured to be used for recording or reproducing video signals in a long time mode such as 3 times, the rotary head 50 has a standard and a long time mode. Conventional outfit! It is convenient because the apparatus of the present invention can also play back magnetic tapes recorded on the magnetic tape.

FIG. 3 is a principle diagram showing the track pattern on the tape 40 formed during recording in the first embodiment of the present invention. In this figure, arrows A and B indicate the tape running direction and the head scanning direction, respectively. show.

Track formation (recording of signals) and reproduction are performed by rotating the rotary drum in the direction of arrow C in FIG. 2(A) while running the tape in the direction of arrow A. 101 is a control track in which a control signal for tracking control during playback is recorded; 111 to 114 are video (video signal recording) tracks formed by magnetic heads 211 or 213, respectively; and 121 to 128 are methods to be described later. This is an audio (audio signal recording) track formed by a set of two tracks. Further, 106 to 109 are guard bands between video tracks 111 to 114 and audio tracks 121 to 128, respectively.

Next, a method of recording and reproducing in standard mode using the apparatus of the present invention will be explained with reference to FIGS. 1 to 4. FIG. 4 is a timing chart for explaining the recording operation and reproducing operation of the apparatus according to the first embodiment of the present invention, and FIG. 4(A) shows the video switching pulses (switching signals for switches 412 and 414) Figures (B) and (C) show video and audio recording signals, respectively.

Analog audio signals from a 2-channel microphone (not shown), etc. are supplied to input terminals IR and IL, and are passed through LPFs (low-frequency P-wave filters) 403 and 404, respectively, to an A/D converter 405.
The two R channels are time-divisionally converted into digital signals and sent to the data bus 406. Data on data bus 406 is stored in RAM 401. At that time, addresses are specified so that the data is interleaved. The data stored in the RAM 401 is sent out again to the data bus 406 and sent to the format encoder 40.
Error correction and detection codes are generated by RAM
407 and is stored at a different address. Since one field's worth of data and error correction/detection codes stored in the RAM 407 are compressed and recorded, they are read out at the signal speed recorded on the tape and sent to the modulator 4 via the data bus 406.
Supplied on 09. The modulator 409 modulates the digital audio signal to match the recording and reproducing characteristics of the VTR's rotary transformer (not shown), heads 211 to 214, and tape 40, and switches the RFC/Pa selector switch 4.
Supply to 10. RFC/Pa selector switch 410
is connected to the RFC terminal side during recording, and selects the PCM recording signal from the selection switch 5ELI constituting the signal switching unit 49.
~4 (412-415).

These switches 412 to 415 are connected to the signal switching section m section 5.
5, the switching is performed according to the timing shown in FIGS. 4(E) and 4(F), and thereby the PCM recording (audio) signal is sent to each head 211 to 214 via the recording amplifier 3 (see FIG. 5). and record on Qi 140.

The specific recording method is first
11, by recording the Nth field of the video signal shown in (8) of the same figure, the video track 1 shown in the third figure is created.
11 and compresses the part of one field period 300 of the corresponding audio signal near the N#th video signal in FIG. Continue to open the PCM recording signal 301, which has been distributed and output (see Figures (F) and (G)).
Recording is performed by the P head 211 to form an audio track 121 shown in the third diagram.

At this point, audio track 121 is the same width as video track 111. The PCM recording signal 302 is overwritten and recorded on a part (left half) of the audio track 121 by the EP head 212 which has a gap azimuth angle different from that of the SP head 211 (reverse azimuth in this embodiment). An audio track 122 is formed. In addition, 106 is both tracks 111 and 121,1
The 0th order, which is the guard band formed between 22
8) The N±1st 1 field of the video signal is the 2nd c
The video track 112 shown in FIG. Te, PCM
The recording signal 303 is then recorded by the open-SP head 213 to form the audio track 123, and then the PCM recording signal 304 is recorded by the SP head 213 using an EP having a different gap azimuth angle (reverse azimuth in this IIA example).
The head 214 overwrites and records a part (left half) of the audio track 123, and the audio track 124 is recorded.
form. Similarly, the tracks after video track 113, and the audio track 1 above them.
25 onwards are formed.

Next, we will explain the operation etc. when reproducing the signal recorded on the magnetic tape 40 as shown in the third figure according to the above-mentioned procedure.When the magnetic tape 40 is attached to the device and the reproduction mode is set, the RFC/PB switching is performed. Switch 410 is PBfl
Connected to the iA side and started to rotate - When the head 50 rotates and the head 140 starts running, the SP heads 211, 213 and the EP heads 212, 214 are selected in the same order as during recording. Each head 211-2 has the same azimuth angle as during recording.
Audio (digital audio) signals (301b and 302 in Fig. 4 (F) and (G)) respectively reproduced by 14
b) is (A) in the same figure as in the recording.

(D, selected at the timing shown in (G), ff1Jil by the demodulator 416, and written into the jitter memory 417. Here, the tarok serving as a reference is used in the video signal processing circuit section 30 to match the above-mentioned audio signal. PLL418 based on the horizontal synchronization signal (SUH) in the video signal that is played at the same time.
．． It is generated by the tarok generation circuit 419. The data read from the jitter memory 417 is transferred to the data bus 42.
0 and stored in RAM 421. If there is an error in the data, the data should not be exchanged with the error correction circuit 422 until it is corrected (during the hatched period shown in FIG. 4 (H)). The correction circuit 423 performs corrections such as average value interpolation, returns the data to the original time axis, and then converts the data to the D/A change JL? 14
24 and return it to a 2ch analog signal to form a series of audio signals, and after removing unnecessary high frequency components of approximately 20kHz or more at LPF 425 and 426, the signals are output to audio signal output terminals 5L and 5R, respectively. (see FIG. 4 (1)), and sound is generated from Lch and Rch speakers (not shown), respectively.

Next, a second embodiment of the apparatus of the present invention will be described with reference to FIGS. 5 and 6. In this second embodiment, the same components as in the first embodiment are given the same numbers, and detailed explanation thereof will be omitted. The main difference between the device of the second embodiment and the device of the first embodiment is that
As shown in FIG.
The position (height) of the center of the P heads 212, 214 is SP
The other configurations of the zero-rotation head 51 (for example, the width of each head 211 to 214, azimuth angle, etc.) and the configuration of the signal processing circuit are as follows: , may be the same as in the first embodiment, so detailed explanation thereof will be omitted.

5 and 6 show how to record and play back in standard mode using the second embodiment device with the above head configuration.
After winding the magnetic tape 40 on the surface of the 0-rotation head 51, which will be explained with reference to the drawings, at a larger angle than the standard angle, the first SP head 211 of a pair of SP heads 40, the above-mentioned standard winding is to form a video (main information signal) track 111 in the angular range, and then (via the guard band 106 of some width) on the extension line of the video track 111 and in a larger number. Audio (first
sub-information signal) forms a track 121.

In this audio track 121, for example, PCM-converted first (L) channel audio (see FIG. 4(F)) is recorded. At this point, audio track 121 has the same track width as video track 111.

Immediately after that, however, the EP head 212, which is narrower than the SP head 211 (about half the width), overwrites the almost central part of the SP head 211, causing audio (second sub-information No. 14) trouble 1.
22 is formed. As a result, the track 121 is divided into two, left and right, making a set of three tracks.Similarly to the 0th order, the standard width SP head 213 is used to create a video track 11.
2 and continue to form the audio track 123 via the gart band 1°7, and immediately after that the audio track 123, which is narrower than this (E
(same width as P head 212) near the center with EP head 214. b to form the audio track 124. As a result, the track 123 is divided into two parts, left and right, resulting in a total of three tracks and one silk track. Thereafter, audio tracks 125 to 128 are also formed in the same manner. Here, audio tracks 121, 124, 125 and video track 111 are adjacent to audio track 123, but these all have different azimuth angles from audio track 123, and the same applies to other combinations, so each recording There is almost no risk of tarostoring between the signals, and therefore there is no need to provide a guard band between these tracks, so the tape 40 can be used more efficiently and is more economical than in the first embodiment.

Next, a third embodiment of the apparatus of the present invention will be described with reference to FIGS. 8 to 10. In addition, in the third embodiment, the first. Components that are the same as those in the second embodiment are given the same numbers, and detailed explanation thereof will be omitted. The main difference between the apparatus of the third embodiment and the apparatus of the first and second embodiments is that the rotary head 52 is provided with another pair of AU heads 215, 21.
6 (hereinafter also referred to as "audio head J" since this is used exclusively for audio signal recording/playback). Also, the rotational axis direction of the EP heads 212, 214 relative to the SP heads 211, 213 is The relative position (height) is the same as that of the first embodiment, but the left and right (i.e. circumferential direction) positions are reversed;
As shown in B), the EP heads 212 and 214 have a higher SP
Alts that precede heads 211 and 213, respectively.
The relative positional relationship between the pair of audio heads 215 and 216 is such that in the lateral (circumferential) direction, they are placed at positions 1 ahead of the intersections x and y of the side surface of the drum 200 and the bisector l, respectively, by θ. As for the height (rotational axis of the drum 200) direction, as shown in FIG.
The position of the lower end is lower than the position of the lower end of the sp heads 211, 213 (h < approximately the same as the width of the sp heads 211, 213)
is placed high. As shown in FIG. 8, the first channel SP and EP heads 211 and 214 have a gap azimuth angle of, for example, +6°, and the second channel EP and SP heads 212 and 213 have a gap azimuth angle of, for example, -6°. The audio heads 215 and 216 have an azimuth angle of /Z + 30", and among these heads, one pair of S
The P heads 211 and 213 are formed to have a standard head width and are normally used to record or reproduce video signals in standard mode, and the pair of EP heads 212 and 214 are formed to have a width approximately half that of the SP heads 211 and 213. It is formed with a head width of
When configured for deep audio recording, this rotary head 52 can have the same configuration as the rotary drum of the conventional device having a rotary head for standard, long-time mode, and FM audio deep recording, and the configuration of the signal processing circuit can be changed as follows. As long as the configuration is as shown in FIG. 9, a conventional VTR of this type can be used, which is convenient.

As shown in FIG. 9, the configuration of the signal processing circuit is different in that the configurations of the video signal processing circuit section 30 and the signal switching control section 55 are different, an FM audio circuit section 60 is added, and the RFC/P8 changeover switch 411 is omitted. 1. shown in FIG. Since it has the same configuration as the signal processing circuit of the second embodiment, detailed explanation thereof will be omitted. Specific recording operations, recording formats on tape, etc. by the apparatus of the present invention equipped with the rotary head 52 having such a configuration are described in the 10th [
! This will be explained with reference to 1. Figures 1O (^) and (B) are the video switching pulse V (switching signal for switches 413 and 415) and the FM audio switching pulse a (switching signal for switches 412 and 414), respectively. C) and (0) indicate video and audio recording signals, respectively. Pulse a is advanced in phase by an amount corresponding to the angle θ when the head is mounted as shown in FIG. 7 compared to pulse V.

First, during recording, the SP head 211 for the first channel is used as shown in the figure (
The Nth one field of the video signal shown in C) is recorded to form the video track 111 shown in FIG. 8, and the one field period 300 of the corresponding audio signal in the vicinity thereof shown in FIG. and two PCH (digital audio)
The recording signals are divided into recording signals 303 and 304 (see (E) in the same figure) and output. The PCH recording signal 303 is the audio head 2
15, the PCH recording signal 304 is recorded on the audio track 123 formed before the video track 112, and then the PCH recording signal 304 is recorded on the left side (left half) of the audio track 123 by overwriting etc. with the EP head 214, and the audio track is formed. 124 is formed. Audio tracks 121 and 122 are formed by an audio head 216 and an EP head 212, respectively, and are respectively formed by a PCH recording signal 301.
, 302 are recorded. Immediately before the audio head 215 records the PCM signal 303, the audio head 215 records the FM audio signal 322 (see (0) in the same figure) in the deep part of the video track 112 during one field period 300 (see (0) in the same figure).
PCM signals 305 and 306 of 310 minutes of one field period of zeroth order, which may be configured to record (see )), are recorded on audio tracks 125 and 126 by audio head 216 and EP head 212, respectively. Similarly, audio tracks 127 and 128 are formed above the video track 114 as shown in FIG.
0) is recorded.

As is clear from FIG. 8, gJ adjacent audio tracks are formed so that their azimuth angles are even more different than in the second embodiment shown in FIG. 6, so cross-daughters between adjacent tracks are further reduced. There is no need to provide guard bands between the tracks, and the tape 40 can be used without waste, which is economical. Note that the video track 111 and the audio track 124 adjacent to it 191# have the same azimuth angle (÷6°), but since the carrier wave frequency bands used are different, there is almost no actual damage caused by cross daughter. ~1
If the FM audio signal is recorded in advance by the audio heads 215 and 216 in the deep part of the 14, it is convenient because it can be compatible with conventional so-called Hi-Fi recording type VTRs.

Next, we will explain the operation, etc. when reproducing the signal recorded on the magnetic tape 40 as shown in FIG. Then, the RFC/Pa changeover switch 410 is connected to the P8 terminal side, and when the rotary head 52 rotates and the tape 4o starts running, the SP heads 211, 213; EP head 214 and audio head 215 are switched in the same order as during recording. .216 is selected. The audio (digital audio) signals (303 and 304 in FIG. 10(J)) respectively reproduced by the respective heads 213 to 216 having the same azimuth angle as during recording are as shown in FIG.
The signals shown in A), (B), and '(F) select (SP heads 211, 213), EP heads 212, 214, and audio heads 215, 216, and the signals shown in (J) to (F) are selected.
At the timings shown in [), the PCM signals 303 and 304 are reproduced (Fig. (J)), error correction (period of the hatched part shown in Fig. (11)), and audio playback signal output (Fig. 300') is performed, and the sound is output from a speaker (not shown) or the like as a series of audio signals.

Finally, recording and reproducing operations in long-time mode, such as 3x, will be explained. Recording of video (picture) signals in the long-time mode is performed using the SP heads 211 and 21 in each of the above-mentioned embodiments.
EP heads 212, 214 are used instead of 3, and the PC
The HH audio signal is also recorded using the open-EP head while forming only one audio track on the extension line of each video track. The double mode is achieved by running the magnetic tape 40 at half the speed of the standard mode, and the 3 tti mode is achieved by running the magnetic tape 40 at half the speed of the standard mode. In addition,
In the case of 3x mode, the respective 19Il contact tracks touch or overlap;
As shown in B), since the azimuth angle between adjacent tracks is wide, there is almost no deterioration in signal quality due to cross daughters.

Next, a specific recording method will be explained with reference to FIG. 11. First, the first channel EP head 212
(or 214) by recording the Nth field of the video signal shown in FIG.
111), and one field period 30 of the corresponding audio signal near the N#-th video signal in the same figure (C).
The 0 part is compressed and one PCM recording (digital audio) signal 301 (see (F) in the figure) is subsequently recorded by the open-EP head 212 to form an audio track. Similarly, the N+-1st 1 of the video signal in FIG. 4 (8)
The field is recorded by the second channel EP head 214 to form a video track (112), and one field period 310 of the corresponding audio signal near this video signal is compressed into one PGM recording signal 303, which is Continue to record with the open-EP head 214 to form an audio track, and in the same manner, create a video track (113).
One audio track is formed on each of the subsequent tracks and above them. In this way, there is no need to switch the magnetic % (EP) head when forming the PCN (9 voices) head changeover switch
As shown in E), a recording pattern substantially similar to the conventional track pattern shown in FIG. 4 is formed by the operation of 0 or more, which is always at the L (low) level.

When reproducing signals recorded in long-time mode or - mode using the above operations, each EP with the same azimuth angle as when recording is required.
are reproduced by the heads 212 and 214, respectively (see FIG. 11).
301b) in F) is (^) in the same figure as when recording.
Selected at the timing shown in (0) and (F), the first
It is demodulated by the demodulator 416 shown in FIG. Here, the reference clock is P based on the horizontal synchronization signal i) in the video signal that is reproduced simultaneously with the audio signal in the video signal processing circuit section 30.
LL418. It is generated by the clock generation circuit 419. Data read from jitter memory 411 is sent to data bus 420 and stored in RAM 421. If there is an error in the data, the error correction circuit 4
If you do not exchange data with 22, please correct the data in Figure 11 (
If uncorrectable data occurs during the hatched period in G), the correction circuit 423 performs corrections such as average value interpolation, returns the data to the original time axis, and then outputs the data to the D/A converter. 424 and return it to a 2-channel analog signal to form a series of audio signals (see Figure 4 (H)), and then
After unnecessary high frequency components of approximately 20 kHz or more are removed by P F 425 and 426, the signals are outputted from audio signal output terminals 5L and 5R, respectively.

As can be understood from the above explanation, in long mode there is only one audio track, so the recording density is reduced and only half the data can be recorded compared to standard mode, but methods such as differential PCH and data compression are used. By performing noise reduction processing, error correction processing, which is a characteristic of PCM audio, is possible, and it is possible to record and reproduce audio signals of sufficiently excellent sound quality without level fluctuations.

In the above explanation, one or more audio tracks are formed on the upper extension line of each video track, but the invention is not limited to this. The configuration for realizing such a recording pattern can be achieved by only slightly changing the relative arrangement of the magnetic heads 211 to 216 on the rotating drum 20G and the configuration of the signal switching control section 55 in the signal processing circuit. It is also possible to form such audio tracks on both sides above and below the video track.

〔effect〕

Since the magnetic recording/reproducing device of the present invention is configured as described above, it is possible to record and reproduce sub information signals in both the standard mode and long time mode, and when recording in the standard mode, the sub information signals can be recorded in the conventional manner. Although the limited magnetic data winding is recorded in the increasing angle range of the device, the recording area can be doubled, and when a digital audio signal is used as the sub information signal, the frequency band is close to 20kllz. For old Fi audio systems that require a dynamic range of 80 dB or more, it is possible to provide a VTR with sufficiently high-quality characteristics, and in addition, in conventional devices with magnetic heads for standard mode and long-time mode, the signal processing circuit's signal This can be achieved by only slightly changing the configuration of the switching control section, etc., and if adjacent sub-information signal recording tracks are formed with different azimuth angles, crosstalk can be almost ignored; There is no need to provide a guard band between them, and the magnetic tape can be used without waste, making it economical. Furthermore, magnetic heads with thicker azimuth angles can also be used to alternately use the magnetic tape for sub information. , it has the excellent feature of being able to further reduce the talostator when a tsuk is formed.

[Brief explanation of the drawing]

FIG. 1 shows the first part of the apparatus of the present invention. Block configuration diagrams of the signal processing circuit of the second embodiment, FIGS. 2(A) and 2(B) are respectively
A plan view and a side view rIR view of the rotating drum of the embodiment device,
3, 6 and 8 are the first embodiment of the present invention. FIG. 4 is a principle diagram showing the track pattern on the tape formed during recording by the apparatuses of the second and third embodiments, and FIG.
A timing chart for explaining recording and reproducing operations in the g-single mode of the device of the second embodiment, Fig. 5 is a side development view of the rotating drum of the device of the second embodiment, and Figs. 7 (^) and (B), respectively. A plan view and a developed side view of the rotating drum of the third embodiment ('111 device), FIG. 9 is a block diagram of the signal processing circuit of the third embodiment of the device of the present invention, and FIG. FIG. 11 is a timing chart for explaining the recording and reproducing operation in the standard mode of the apparatus of the present invention in the standard mode. FIG.
FIG. 12 is a block diagram of a conventional device, and FIG. 13 is a record of the conventional device. A timing chart for explaining reproduction operation, FIG. 14 is an explanatory diagram of a pattern recorded on a tape by a conventional apparatus. IL, IR...audio signal input terminal, 5L, 5R...
Audio signal output terminal, 30... video signal processing circuit section, 4
0...Magnetic tape, 49...Signal switching unit, 50~
52... To rotation/y-do, 55... Signal switching control section,
60...FM audio circuit section, 101...Control track, 102-109...Gart band,
111-114... Video (main information signal recording) track, 121-128... Audio (sub information signal recording ll1) track, 200... Rotating drum, 211
,213...sp head, 212°214...EP
Head, 215, 216...AU (audio) head, 4
03,404,425,426...LPF, 405
...A/D converter, 406,420...Data bus, 407,421...RAM, 408...Format encoder, 409...Modulator, 410.411
...RFC/PB selector switch, 412 to 415
...Selection switch, y-chi, 416...Demodulator, 417.
...Jitter memory, 418...PLL,
419... Clock generation circuit, 422... Error correction circuit, 423... Correction circuit, 424... D/A converter. Patent applicant: Victor Japan Co., Ltd.

Claims (7)

[Claims] (1) A rotating drum, a tape loading mechanism for attaching a magnetic tape to the surface of the rotating drum at a standard angle, and a head gear azimuth provided on the surface of the rotating drum at a distance of 180 degrees from each other. A magnetic recording/reproducing device comprising at least a pair of wide SP heads with different angles and a pair of narrow EP heads with different head gap azimuth angles provided adjacent to the pair of SP heads. The tape loading mechanism is configured to wrap the magnetic tape around the surface of the rotating drum at an angle greater than the standard angle, and when recording in the standard mode, one of the pair of SP heads is used to A main information track is formed in the standard winding angle range of the magnetic tape, and then the first sub-information is formed on the extended line of the main information track using the same SP head and on the portion of the magnetic tape that is wound a little more. form the track for the above EP
Among the heads, an EP head having an azimuth angle different from that of the SP head has a second track on a part of the first sub information track.
By overwriting and forming sub-information tracks, multiple sub-information tracks are formed on the extension line of one main information track, and when recording in long-time mode, the above A pair of EP heads alternately lay main information tracks in the above standard winding angle range of the magnetic tape, and furthermore, on an extension of the main information track, the same EP head covers the part of the magnetic tape that has been wound more than above. A magnetic recording/reproducing device characterized in that the sub information tracks are formed so that one sub information track is formed on an extension line of one main information track. (2) Magnetic recording/reproducing according to claim 1, wherein the second sub-information track is formed in the left half or right half of the first sub-information track during recording in the standard mode. Device. (3) The magnetic recording/reproducing apparatus according to claim 1, wherein the second sub-information track is formed approximately at the center of the first sub-information track during recording in the standard mode. (4) A rotating drum, a tape loading mechanism for attaching a magnetic tape to the surface of the rotating drum at a standard angle, and a head gap azimuth provided on the surface of the rotating drum 180 degrees apart from each other. A pair of wide SP heads with different angles; a pair of narrow EP heads with different head gap azimuth angles provided adjacent to the pair of SP heads; In a magnetic recording/reproducing device comprising at least a pair of AU heads provided angularly apart, the tape loading mechanism is configured to wrap the magnetic tape around the surface of the rotating drum at a larger angle than a standard angle. When recording in the standard mode, main information tracks are formed alternately by the pair of SP heads in the standard winding angle range of the magnetic tape, and the main information tracks are formed on an extension line of the main information track and in the above-mentioned large number of directions. 1 above on the part of the magnetic tape wrapped around the
By alternately using either of the pair of EP heads and the pair of AU heads to form the first and second sub-information tracks, multiple When recording in a long-time mode, the pair of EP heads alternately forms main information tracks within the standard winding angle range of the magnetic tape. Furthermore, by forming a sub-information track with the same EP head on the extended line of the magnetic tape and on the part of the magnetic tape that has been wound a lot, one sub-information track is formed on the extended line of one main information track. A magnetic recording/reproducing device characterized in that it is configured to form a track. (5) The magnetic recording system according to claim 4, characterized in that the pair of AU heads has azimuth angles that are significantly different from each other than the pair of EP heads and the pair of SP heads.
playback device. (6) When recording in standard mode, the two SP heads and EP heads are selected so that the main information track and the sub information track that are formed on the same straight line are formed at different azimuth angles. Combined Claim No. 4
The magnetic recording/reproducing device described in Section 1. (7) Magnetic recording according to claim 1 or 4, characterized in that it is configured to record/reproduce a video signal as a main information signal and a digitized audio signal as a sub information signal, respectively. /Playback device.