JPH01100707A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To obtain a medium with a satisfactory characteristic by forming plural sub information tracks on the extension line of one main information track in both a reference mode and a long time mode. 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 by compressing to two PCM recording signals and recording the PCM recording signal by the SP head 213. Following that, an audio track 124 is formed by recording the PCM recording signal 304 by overwriting on a part (left part) of the audio track 123 by an EP head 214 having a gap azimuth angle different from that of the SP head 213. Therefore, it is possible to form the sub information track consisting of a pair of two tracks on the extension line on the upper side of the main information track in both the reference mode and the long time mode, and 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 11F (hereinafter referred to as rVTR).

In particular, it relates to a main information signal (hereinafter also referred to as a "video signal" as it will be explained using a video signal as a typical example) track and a sub information signal (also referred to as a "device"). Since the description will be made using audio signals as a representative example, the present invention relates to a VTR capable of recording/reproducing audio signals (hereinafter also referred to as "audio signals").

C. Prior Art] A method in which an audio signal is FM modulated and frequency-multiplexed with a video signal for recording, and a method in which deep recording is performed in the thickness direction of the tape are being adopted for home VTRs.

However, this method cannot be said to be sufficient in terms of quality such as continuity for each field, band, and S/N. Therefore, the true meaning of so-called PCM, which converts audio signals into digital codes and records and reproduces them, is For example, in the case of a small home VTR called ``81 Video'', magnetic tape (hereinafter also simply referred to as ``Tape J'') is mounted on a rotating drum. A method is being adopted in which the winding angle is increased from 180 degrees, which is the angle corresponding to vA, and a band-compressed digital audio signal is recorded and reproduced in units of one field in that portion.

A conventional VTR of this type will be explained with reference to FIG. 11 and subsequent figures. Figure 11 shows the above method. These are the block components of the conventional VTR described above, and IL and IR are the left (L) for recording audio signals as an example of sub information signals.
audio signal input terminals for ch (channel) and right (R) channel; 2 is an audio signal recording processing circuit for sampling the same audio signal and performing 2-time axis multiplexing, time axis compression, etc.; 3 is a magnetic head c A recording amplifier for supplying an appropriate Mt current to the head J (hereinafter simply referred to as "head J");
5L is an audio signal reproduction processing circuit that performs signal processing such as time-axis expansion of the audio signal reproduced from the head, and separation into Rch audio signals.

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 amplifiers for amplifying the signal played back from the tape. , 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; Reference numeral 19 indicates a playback video signal output terminal; 20 indicates a head switch pulse generation circuit for controlling the changeover switches 6 and 17; and 21.22 records a video signal and an audio signal on the tape 40, or transfers the previously recorded signals to the tape 40. 1st for better playback. Second
23 is a rotating drum (hereinafter also simply referred to as "drum J") on which these magnetic heads 21 and 22 are mounted at an angle of 180 degrees, and 24 is a rotation detector for detecting the rotational phase of the rotating drum 23. be.

As shown in this figure, the tape 40 is attached to the rotating drum 23.
On the other hand, the IR-type 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 trace recording tracks diagonally with respect to the tape 40. Recording is performed while forming, and during reproduction, if the heads 21 and 22 have different azimuth angles, signals are reproduced while being alternately traced by heads having the same azimuth angle as that used for tracing during recording.

FIG. 12 is a signal waveform diagram (timing chart) for explaining the recording and reproducing operations of the conventional device.

FIG. 13 is a principle diagram showing the recording pattern (track pattern) on the tape 40. Figure 12 (A).

(8) is the analog audio signal waveform diagram of Lch and Rch, respectively, (C) is the analog audio signal of R114ch and the analog audio signal of A/D conversion conversion 1 side, and (0) is the video ffl signal waveform diagram. , (E) and (F) are diagrams showing the timing of recording digital audio signals and video signals with the heads 21 and 22, respectively.
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. In this way, the audio signal forms a magnetization pattern including A I , A 2 , A 3 r . . . at the lower end of each magnetic track, as shown in FIG. Since the video signal is recorded in the angular range V (180°) shown in FIG. 11, the video signal is recorded on the tape following the audio signal. In this way, the first and second magnetic heads 21.
22 are supplied with an audio signal and a video signal in the relationship shown in FIG. A magnetization pattern is formed as 2 r P 3 , .

[Problem that the invention seeks to solve]

Therefore, the audio signal is transmitted on the extension line of one video track. Next, in the conventional device configured to record/play back a single audio track formed by the increasing range of the angle, the winding is performed by increasing the angle (3 in the case of 8 ml VTR).
6°) is 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 VH3 method, there is a natural limit to the increase in the angle of wrapping due to compatibility reasons. If we were to try to increase the recording capacity by significantly increasing the winding angle without considering compatibility, we would have to increase the tilt angle of the tape (or drum rotation axis) and increase the tape speed. It would be possible to speed up the recording, but in that case, the disadvantage would be that the recording time of the tape used would be shorter than standard recording. Therefore, in order to record digital audio signals, three tapes are used as described above.
In a conventional VTR that records the same number of audio tracks as conventional magnetic tracks by winding the magnetic track 6 degrees more than the conventional magnetic track, 2
Sampled at +H (Lr31.5 kHz),
Compressing 10-bit quantization to 8 bits for recording is the best, and the disadvantage is that it has insufficient characteristics for old Fi audio, which requires a frequency band of nearly 20 kHz and a dynamic range of 80 dB or more. there were.

[Means for solving problems]

The magnetic recording/reproducing device of the present invention has a
Yet another pair of first and second sub-information recording and reproducing heads formed to have a width approximately half that of the EP head and having different head gap azimuth angles are spaced apart from each other by a predetermined distance from the pair of EP heads. At the same time, a third sub-information signal recording/reproducing head having a width narrower than the first SP head and having a different azimuth angle from the first SP head of the pair of SP heads is provided at a predetermined distance from the first SP head. In addition, there is a magnetic tape on the surface of the rotating drum! The tape loading mechanism is configured so that the magnetic tape is wound at a larger angle than the standard angle, and when recording in standard mode, the standard winding of the magnetic tape is done by the first SP head in such a way that the magnetic tape is wound at a greater angle than the standard angle. form,
Subsequently, using the same SP head, a first sub-information track is formed on the extended line of the main information track and on a portion of the magnetic tape that has been wound a lot, and then a third sub-information signal recording/reproducing head is used to form the 'first sub-information track. A second sub-information track is overwritten on the right or left half of the sub-information track, and then a second sub-information track is formed.
The standard method for winding magnetic tape with an SP head is to form a second main information track in an angular range adjacent to the first main information track, and then continue to wind the second main information track with the same SP head. A third sub-information track is formed on a portion of the magnetic tape that is wound in a large amount on an extension line of A fourth sub-information track is formed by overwriting the left or right half of the third sub-information track,
When recording in long-time mode, the standard winding of the magnetic tape is to form the first main information track in the angular range with the first EP head of a pair of EP heads, and then with the same EP head to form the first main information track. A first sub-information track is formed on the extended line of the information track and in a portion of the magnetic tape that is wound with a larger amount, and then the first E of the pair of sub-information recording/reproducing heads is formed.
The P head is formed by overwriting a second sub-information track on the right or left half of the first sub-information track using a first sub-information recording/reproducing head having a different azimuth angle, and then forming a second sub-information track on the right or left half of the first sub-information track. The standard winding of magnetic tape with a second EP head is to form a second main information track in an angular range adjacent to the first main information track, and then continue to wind the second main information track with the same EP head. A third sub-information track is formed on a portion of the magnetic tape that is wrapped around the magnetic tape in a larger amount on the extension line of the magnetic tape track, and then the tube 2
The EP head is a second sub-information recording/reproducing head having a different azimuth angle, and is formed by overwriting the fourth sub-information track on the left or right half of the third sub-information track. In both the standard mode and the long-time mode, by forming a plurality of sub information tracks on an extension of one main information track,
This solves the various drawbacks of the conventional devices mentioned above.

[First Example] With reference to FIGS. 1 to 4, the magnetic recording/
A first embodiment of the playback device will be described.

FIG. 1 is a block configuration diagram of the device of the present invention, and in this figure, the same components as in the conventional device shown in FIG. Inside, 403, 404.425.426 are LPF (low pass filter), 405 is A/D converter, 406.420 is data bus, 407, 421 is RAM (Random Ac
cess Henory), 408 is a 7-auto encoder, 409 is a modulator, 410 is an RFC/PR
(recording, playback mode) selector switch, 412-415
, 435, 436 are selection switches (constituting the signal switching section 49), 30 is a video signal processing circuit section, 53 is a delay circuit, 55 is a signal switching control section, 416 is a demodulator, 417
is jitter memory (jitter processing memory), 418 is PLL (Phaso Locked Loop)
, 419 is a tarok generation circuit, 422 is an error correction circuit,
423 is a correction circuit, and 424 is a D/A converter.

FIG. 2(A) is a plan view of a rotating drum (hereinafter simply referred to as "drum j") 200 (rotating rod 50) applied to the apparatus of the present invention, and FIG. 2(B) is a side development view of the drum 200. In FIGS. 2A and 2B, arrow C indicates the direction of rotation of the head. As is clear from FIG. and y is of course 18
They are spaced apart at an angle of 0°, and near the intersection
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 at a central angle α. Near the intersection y, the second channel SP head 213 and the first channel EP head 214, which is a head for recording/reproducing sub information, are arranged close to each other at an angle α.

Then, a PCH head (an audio dedicated head that is a head dedicated to recording/reproducing sub information signals) 219 is located at a position separated by an angle γ from the SP head 211, and an EP head 2
A pair of audio-only EP heads 217, 218r (sometimes collectively referred to as "magnetic heads") are arranged at positions spaced apart by an angle β from 12.214. The angle γ is set according to the switching timing of the selection switch 413, and the switching timing is determined by the recording timing of the sub information recording track 122, which will be described later.

As for the relative position 7IlrfRgA in the height direction of these magnetic heads 211 to 214 and 217 to 219, as shown in FIG. PC? 4 head 215 and audio-only EP head (hereinafter also simply referred to as "audio head J")
The lower end position of 217 is SP head 211J, P head 2
Each than the lower end position of 14? z (SP head 211,
The lower end of the audio head 218 is located lower than the lower end of the EP head 212 by h2.

Also, the width of the PCH head 219 is the same as that of the SP heads 211, 2.
13, and the head gap has, for example, -
It has an azimuth angle of 6°. In addition, S of the 1st Ch.
The P and EP heads 211 and 214 have a gap azimuth angle of ÷6°, and the EP and SP heads 212 and 213 of the second channel have a gap azimuth angle of -6°, and among these heads, one pair of SP heads 211 and 213 are formed to have a standard head width and are normally used for recording or reproducing video signals in a standard mode, and a pair of EP heads 212 and 21;
4 is formed with a head width approximately half that of the sp heads 211 and 213, and is configured to be used for recording or reproducing video signals in a long-time mode such as 3 times, then this rotary head 50 can be used as a standard rotary head 50. It is also convenient because it is compatible with conventional devices that have a long-time mode.

FIG. 3 shows a tape 40 formed during recording with the apparatus of the present invention.
This is a principle diagram showing the above track pattern. In this figure, arrows A and B indicate the tape running direction and head scanning direction, respectively. While the tape is running in the direction of arrow A, the rotating drum is rotated as shown in Fig. Track formation (signal recording) and reproduction are performed by rotating in the direction of arrow C.

'101 is a control track in which a control signal for tracking control during playback is recorded; 111~
114 is a video (video signal recording) track formed by SP head 2° 11 or 213, respectively;
128 are audio (audio signal recording) tracks formed in sets of two by a method described later.

Further, 106 to 109 are video tracks 111 to 1, respectively.
14 and the guard band between audio tracks 121-128.

Next, a method of recording 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. switching signal)
, (C) and (D) of the same figure show the video and audio recording signals, (E) of the same figure shows the recording timing of the PCH (audio) recording signal, and (F) of the same figure shows the PGM (audio) signal. The signals for specifying the area to be recorded and the head to be recorded are shown, respectively.
(High 1 level) and the switching pulse shown in the figure (B) is L (Lo*l eve l) and (F)
When the signal level in the figure is H, the SP head 211 is selected,
(B) If the illustrated switching pulse is also H, the PCH head 215 is selected.

Analog audio signals from a 2-channel microphone (not shown) etc. are supplied to input terminals IR and IL, and are sent to an A/D converter 405 via PFs (low frequency filters) 403 and 404, respectively.
The two R channels are time-divisionally converted into digital signals and sent to the data bus 406. Data on data bus 40G is stored in RAM 407.

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 an error correction and detection code is generated by the format encoder 408.
It is stored at a different address in M407. 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 supplied to the modulator 409 via the data bus 406. Ru. A modulator 409 transmits a digital audio signal to a VTR rotary transformer (not shown); magnetic heads 211 to 214, 217 to 219, and tape 4.
The RF
It is supplied to the C/Pa changeover switch 410.

The RFC/Pa changeover switch 410 selects the RF
Connected to the C terminal side, the PCM recording signal is sent to the signal switching unit 4.
Selection switches 5EL1-4 (412-4
15). These switches 412 to 415 are controlled by control signals from the signal switching control section 55 as shown in FIG.
According to the timing shown in F), the PCM recording (audio) signal is transferred to each magnetic head 211-214, 217-219 via the recording amplifier 3 (see FIG. 5).
and record it on the tape 40.

For the specific recording method, first, go to the SP for the 1st Ch.
11, the video track 111 shown in FIG. 3 is formed by recording one field of the Nth video signal shown in FIG. ) is compressed to produce two PCM recording signals 301 and 302.
(See Figure (E) 10)
The recording signal 301 is subsequently recorded by the same SP head 211 to form the 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 s
A PCH head 219 having a gap azimuth angle different from that of the p head 211 (in this example, the opposite azimuth to i) is used to overwrite and record a part (right half) of the audio track 121, thereby forming an audio track 122. be done. Note that the guard band 106 between both tracks 111 and 121, 122 is not necessarily provided.The N+1th field of the video signal of FIG. to form the video track 112 shown in the third figure, and compress one field period 310 of the corresponding audio signal near this video signal and divide it into two P'CM recording signals 303 and 304, and output the PCM recording signal 303. continues to be recorded with the same SP head 213 to form an audio track 123,
Next, the PCM recording signal 304 is recorded on the audio 1 rack 123 by the EP head 214 having a gap azimuth angle different from that of the SP head 213 (in this embodiment, reverse azimuth).
The audio track 124 is formed by overwriting and recording a part (left half) of the audio track 124. In the same way, video tracks 113 onwards and audio tracks 125 onwards are formed above them. Here, the fourth
As shown in FIG. PCH used for
Each SP head 21 of the head 219 and the EP head 214
1 and 213 (see FIG. 2), and the combination of recording audio signals and heads used is not limited to the above combinations.

As is clear from Figure 3, since adjacent audio tracks have different azimuth angles, there is almost no risk of crosstalk between each recorded audio signal, and therefore it is necessary to provide a guard band between these tracks. Because there is no
It is economical because the tape 40 can be used without waste. Note that the video track 111 and the audio track 124, which is partially in contact with it g4, have the same azimuth angle (+6
), but since the carrier wave frequency bands used are different, there is almost no problem due to crosstalk.

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 procedure. The switch 410 is connected to the Pa terminal side, and when the rotary head 50 rotates and the tape 40 starts running, the sp head 21 is turned on in the same J order as during recording.
1,213. EP head 214 and PCH head 21
9 is selected. Each head 2 with the same azimuth angle as during recording
11, 213, 214, and 219, respectively (30 in Fig. 4 (J))
1b and 302b) are (A) in the same figure as when recording.
+8), (F), and (J), demodulated by the demodulator 416, and stored in the jitter memory 41.
7 is written. The reference tarok here is based on the horizontal synchronization signal <fs) in the video signal that is played back simultaneously with the audio signal in the video signal processing circuit section 30.
418. It is generated by the tarok generation circuit 419. Data read from jitter memory 417 is sent to data bus 420 and stored in RAM 421. If there is an error in the data, the error correction circuit 422
(during the period in which data is corrected while sending and receiving data between After returning the data to the original time axis, it is supplied to the D/A converter 424 and converted back to a 2-channel analog signal to form a series of audio signals, and is further processed by LPFs 425 and 426 to remove unnecessary high frequency components of about 20 kHz or more. After removing the
Output from the audio signal output terminals 5L and 5R, respectively (Fig. 4 ([
), and the sound is generated from Lch and Rch speakers (not shown), respectively.

Next, recording and reproducing operations in a long-time mode such as 3x mode will be explained with reference to FIG. 5.

Mechanically, the magnetic tape 40 is a! The double mode is realized by running at half the speed of the semi-mode, and the triple mode is realized by running at the same speed. Although the magnetic heads used for recording video signals and PCH (digital) audio signals in long-time mode are different, the recording pattern is different from the recording pattern in standard mode shown in Figure 3 as follows. The track width is the same, and the track width is about half in the double mode and about half in the triple mode, and there is no change in principle, so a detailed explanation of the track pattern and its formation method will be omitted.

In recording in such a long time mode, the sp head 2
EP heads 214 and 212 are used in place of heads 11 and 213, and audio heads 217 and 218 are used in place of PCH head 219 and EP head 214, respectively. Therefore, the width of the EP head 214, 212 is changed to the width of the sp head 211,
213, the video track 11
1 to 114 are also partly recorded overlapping each other, but EP head 2
Since the azimuth angles of 14 and 212 are different from each other, there is almost no problem with the tarostator or the like.

As mentioned above, the position of the lower end of the audio head 217 is E.
The P heads 212 and 214 are placed higher by h3 than the lower ends, and the audio head 218 is placed lower by h2 (see Fig. 2 (8)?);
M opening angle β from 14,212 and recording track 111~
114, 121 to 128 with respect to the longitudinal direction of the tape 40, and substantially (based on the recording track) the EP head 214 and the audio head 2
17, and between the EP head 212 and the audio head i.
The lower ends of 18 coincide with each other. Also, the separation angles of both heads are the same fi! (β), so the recording timing of the signal 302 with respect to the PCM recording signal 301 is
The recording timing of the signal 304 with respect to the PCM recording signal 303 is the same (see FIG. 5(F)), and this point is different from the recording (and reproduction) in the standard mode. The configuration and operating principle are also substantially the same as in the standard mode, so a detailed explanation thereof will be omitted.

[Second Embodiment] Next, a second embodiment of the magnetic recording/reproducing apparatus of the present invention will be described with reference to FIGS. 6 to 10. 6th
The figure is a block ellipse diagram of the second embodiment of the device of the present invention, FIGS. 7(^) and (B) are respectively a plan view and a developed side view of the rotating drum of the same device, and FIG. 8 is a recording made by the same device. FIGS. 9 and 10 are diagrams showing the principle of track patterns formed on a tape when the same device is used for recording in the standard mode and long-time mode, respectively.

This is a timing chart for explaining the reproduction operation, and in these figures, the same components as those of the first embodiment shown in FIGS. 1 to 5 are given the same numbers, and detailed explanation thereof will be omitted.

Comparing FIGS. 6 to 10 with FIGS. 1 to 5, it is clear that the first
The main difference from the device of the embodiment is that the rotating head 50 has a PCl
4 heads 219, another pair of AU heads 215
, 216 (Since the audio is used only for number recording/playback, hereinafter "audio head J may also be written). Also, the sp head 211,
The relative positions (heights) of the EP heads 212 and 214 in the rotational axis direction with respect to the EP head 213 are the same as in the first embodiment, but the left and right (i.e. circumferential direction) positions are reversed. As shown in FIGS. (A) and (B), the EP heads 212, 2
14 precedes the SP heads 211 and 213, respectively. Further, the relative positional relationship between the pair of AU heads 215 and 216 is as follows in the lateral (circumferential) direction:
It is placed at a position preceding each θ from the intersection x and y of the side surface and the bisector llj, respectively, and the height direction is
), the lower end positions of the AU heads 215 and 216 are hater than the lower ends of the sp heads 211 and 213.
(approximately the same width as the SP heads 211 and 213). Also, as shown in the same figure (B), the first channel
For example, the SP and EP heads 211 and 214 of the 2nd channel are set at +6°, and the EP and SP heads 212 and 213 of the 2nd channel are set at -6°, for example.
The AU heads 215 and 216 each have a gap azimuth angle of ±30°, and among these heads, one pair of SP heads 21
1,213 is formed into a standard head width, and the video signal is normally #! ! The SP head 211 is used for recording or reproducing in a semi-mode, and a pair of EP heads 212 and 214 are used for recording or reproducing in a semi-mode.
．． The head width is about half that of 213, and it is normally used to record or reproduce video signals in 3x mode, and when a pair of AU heads 215 and 216 are configured for deep FM audio recording, this rotation The head 50 can be of the same configuration as the rotary drum of the conventional apparatus having a rotary head for standard, long-time mode, and FM sound deep recording, and the configuration of the signal processing circuit as shown in FIG. 6 is sufficient. ,
It is convenient because a conventional VTR of this type can be used.

With the change in the configuration of the rotary head 50 as described above, the configuration of the signal processing circuit is changed to the video signal processing circuit section 30. as shown in FIG. The configuration is the same as that of the signal processing circuit of the first embodiment shown in FIG. 1, except that the configurations of the signal switching section 49 and the signal switching control section 55 are changed, and the FM audio circuit section 60 is added. A description of the configuration will be omitted. The specific recording operation, tape recording format, etc. by the apparatus according to the second embodiment of the present invention equipped with the rotary head 50 having such a configuration will be explained with reference to FIG. 9. FIG. 9(A) and +8) are video switching pulses V (switching signals for switches 413 and 415), respectively.
and FM audio switching pulse a (switching signal for switches 412 and 414), and (C) and (0) in the figure show video and audio recording signals, respectively. , the head mounting shown in FIG. 7 is advanced in phase by an amount corresponding to the angle θ.

First, when recording in standard mode, the first channel
The head 211 records the Nth field of the video signal shown in FIG.
1 and compresses the 1 field period 300 of the corresponding audio signal in the same figure (0) in the vicinity and transmits it to two PCs.
old digital audio) recording signals 303 and 304 (same figure (
(See E)) and output. PCM recording signal 303
is recorded by the AU head 215 on the audio track 123 formed before the video track 112, and then the PCM recording signal 304 is recorded on the audio track 123 formed before the video track 112.
The audio track 124 is formed on the left side (left half) of 3 by overwriting or the like using the EP head 214. Audio tracks 121 and 122 are formed by an AU head 216 and an EP head 212, respectively, and record PCH recording signals 301 and 302, respectively. During one field period 300 (see (D) in the same figure) immediately before the AU head 215 records the PCH signal 303, the AU head 21
5 may be configured to record an FM audio signal 322 (see (H) in the same figure) in the deep part of the video track 112.
5 and 306 are the AU head 216 and the EP head 2, respectively.
12 is recorded on audio tracks 125 and 126. Similarly, audio tracks 127 and 128 are formed on the extension line of the video track 114 as shown in FIG. 8, and the PCH signal is recorded.

As is clear from FIG. 8, the azimuth angles of the audio tracks in contact with FIJ are formed to be more different than in the first embodiment shown in FIG. 3, so the crosstalk between tracks in contact with IvJ is further reduced. Ru.

Although the video track 111 and the partially adjacent audio track 124 have the same azimuth angle (6°), they use different carrier wave frequency bands, so there is almost no actual damage caused by Talostalk.

In addition, AU is added to the deep part of each video track 111 to 114.
If the heads 215 and 216 are configured to record the FM audio signal in advance, the conventional so-called Hi-F
It is also convenient because it is compatible with i-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 Pa terminal side, and when the rotary head 50 rotates and the tape 40 starts running, the SP heads 211, 213° and the EP heads 212, 214 are switched in the same order as during recording.
and AU heads 215 and 216 are selected. To each magnetic field with the same azimuth angle as during recording ・7 dos 212, 214 to 21
Audio (digital audio) played by 6
The signals (303 and 304 in FIG. 9(J)) are the same as those in FIG. 9(A) and (B) during recording.

By the signal shown in (F) (SP head 211, 213
) EP head 212, 214 and AU head 215.2
16 is selected, and the PCM signals 303 and 304 are reproduced ((J) in the same figure) at the timing shown in (J) to (a) in the same figure.
, error correction (the period indicated by the hatched part in the figure ()), and audio playback signal output (the hatched part in the figure ([)) are performed, and a series of audio signals are output from a speaker (not shown), etc. It is pronounced from

Next, with reference to FIG. 10, the recording and reproducing operations in the long-time mode, such as 3 times longer, in the second embodiment apparatus will be explained. The 2x mode is realized by running at the speed of , and the 3x mode is achieved by running at the speed of blue. Video signal and PCH (in long-time mode)
When recording (digital) audio signals, the magnetic head used is different from when recording in standard mode, and SP head 2 is used.
EP head 214, 212 is used instead of 11.213, EP head 212, 214 and AU head 215.
, 216 are replaced by audio heads 217, 218. That is, the combination relationship of such magnetic heads is as described above.
It is completely the same as the apparatus of the embodiment, and therefore, recording and reproduction in the long-time mode are performed by the apparatus of the first embodiment.

The principle is the same as that of playback (if the relative position between each magnetic head is different, the recording timing changes slightly as shown in Figure 10 (E) and (F)), and the recording pattern is also the same as that of playback. The result is as shown in FIG. 3, and a detailed explanation thereof will be omitted since it can be easily inferred from the previous explanation.

As understood from the above explanation, the first. In both devices of the second embodiment, each audio track has two tracks not only in the standard mode but also in the long time mode, so a large storage capacity can be maintained and a large amount of data can be recorded at a high recording density.
Error correction processing, which is a characteristic of PCM audio, is possible without using methods such as differential PCH, data compression, or noise reduction processing, and it is possible to record and play back audio signals with sufficiently excellent sound quality without level fluctuations. It is.

In the above explanation, two 1M audio (audio)
Although the above description assumes that the tracks are formed on the upper extension of each video track, the track is not limited to this and may be formed on the lower side in advance of the video track. The configuration is a rotating drum 200
The relative arrangement of the magnetic heads 211 to 216 in
It is only necessary to slightly change the configuration of the signal switching control section 55 and the like in the signal processing circuit, and it is also possible to form such an audio track on both sides of the video track.

〔effect〕

Since the magnetic recording/reproducing apparatus of the present invention is constructed as described above, a set of two sub-information tracks can be formed on the upper extension line of the main information track in both the standard mode and the long-time mode. This enables high-density recording of sub-information signals,
This makes it possible to reproduce sub-information signals, and although the limited winding of the magnetic tape as in the conventional device records the recording area within an increasing angle range, the recording area can be doubled, and digital audio signals can be reproduced as sub-information signals. When using an I
For f i fi audio, it is possible to provide a VTR with sufficiently high quality characteristics, and in a conventional device that has a magnetic head for conventional S single mode and long mode, the configuration of the signal switching control section of the signal processing circuit, etc. This can be realized by just slightly changing the azimuth angle of the sub-information signal recording tracks that are in contact with each other, so the tarostator can be almost ignored, and a guard band can be placed between these tracks. It is not necessary to provide a magnetic tape, and it is economical because the magnetic tape can be used without wasting it.Moreover, if a magnetic head with a larger azimuth angle is also used to alternately form sub-information tracks, the tarostator becomes even more efficient. It has the excellent feature of being able to reduce

[Brief explanation of the drawing]

1 and 6 are block diagrams of the signal processing circuits of the first and second embodiments of the device of the present invention, respectively, and FIG. 2(A),
(B) is a plan view and a developed side view of the rotating drum of the apparatus of the first embodiment, respectively, and FIGS. 4 and 9 are the principle diagrams showing the track patterns of the first embodiment of the present invention, respectively. 5 and 10 are timing charts for explaining recording and reproducing operations in the a single mode of the device of the second embodiment. 7A and 7B are respectively a plan view and a developed side view of the rotary drum of the second embodiment, and FIGS. 12 is a timing chart for explaining the recording and reproducing operations of the conventional apparatus, and FIG. 13 is an explanatory diagram of the recording pattern on the tape in the standard mode by the 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...
- Rotating head, 53... Delay circuit, 55... Signal switching control section, 60... FM audio circuit section, 101.
...Control track, 102-109...Gart band, 111-114...Video (for recording main information signal) track, 121-128...Audio (for recording sub-information signal) track, 200... rotating drum,
211,213...sp head, 212,214...
・EP head, 215, 216...AU head, 21
7,218...Audio (dedicated EP) head, 219...
・PCH head, 403.404.425.426...
・LPF, 405... A/D converter, 406: 4
20...Data bus, 407°421...RAM,
408...Format encoder, 409...Modulator, 410,411...RFC/Pa switching switch
412-415, 435, 436...Selection switch, 416...Demodulator, 417...Jitter memory, 418...PLL, 419...Tarlock generation circuit, 422...Error correction Circuit, 423... Correction circuit, 424... D/A converter.

Claims (5)

[Claims] (1) A rotating drum, a tape loading mechanism for attaching a magnetic tape to the surface of the rotating drum over a standard angle, and a head gap 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 above E is applied to the surface of the rotating drum.
Yet another pair of first and second sub-information recording and reproducing heads formed to have a width approximately half that of the P head and having different head gap azimuth angles are provided at a predetermined distance from the pair of EP heads. At the same time, the first SP head is spaced a predetermined distance from the first SP head of the pair of SP heads.
A third sub-information signal recording/reproducing head having a width narrower than the head and having a different azimuth angle is provided, and the tape loading is further performed so that the magnetic tape is wound around the surface of the rotating drum at a larger angle than the standard angle. When recording in standard mode, the first SP head forms a first main information track in the standard winding angle range of the magnetic tape, and then the same SP head forms a first main information track in the standard winding angle range of the magnetic tape. A first sub-information track is formed on the extended line of the track and on the portion of the magnetic tape that has been wound a lot, and then the third sub-information signal recording/reproducing head is used to form the first sub-information track. A second sub-information track is overwritten on the right or left half, and then a second main information track is written on the magnetic tape in the standard winding angle range using a second SP head. A third sub-information track is formed adjacent to the first main information track, and then a third sub-information track is formed on the extended line of the second main information track using the same SP head and on a portion of the magnetic tape that is wound a little more. and then the above pair of E
A fourth sub-information track is overwritten on the left or right half of the third sub-information track using an EP head having a different azimuth angle from that of the second SP head among the P heads. When recording in time mode, the first EP head of the pair of EP heads is used to form the first main information track in the standard winding angle range of the magnetic tape, and then the same EP head is used to form the first main information track in the standard winding angle range of the magnetic tape. A first sub-information track is formed on the extended line of the information track and on a portion of the magnetic tape wound with a larger amount, and then a track is formed with the first EP head of the pair of sub-information recording/reproducing heads. is formed by overwriting a second sub-information track on the right or left half of the first sub-information track using a first sub-information recording/reproducing head having a different azimuth angle, and then a second sub-information track is formed by overwriting the right or left half of the first sub-information track. A second main information track is formed adjacent to the first main information track in the standard winding angle range of the magnetic tape using an EP head, and then the second main information track is formed using the same EP head. A third sub-information track is formed on the extended line of the track and on the part of the magnetic tape wound a little more, and then a second sub-information signal recording/reproducing track having a different azimuth angle from the second EP head is formed. A fourth sub-information track is placed on the left or right half of the third sub-information track by the head.
By overwriting and forming the sub-information track of
A magnetic recording/reproducing device characterized in that a plurality of sub information tracks are formed on an extension of a main information track of a book. (2) A rotating drum, a tape loading mechanism for attaching a magnetic tape to the surface of the rotating drum over 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, yet another pair of mutually arranged AU heads formed on the surface of the rotating drum have a width approximately half that of the EP head. First and second sub-information recording and reproducing heads having different head gap azimuth angles are respectively provided at a predetermined distance from the pair of EP heads, and the magnetic tape is placed on the surface of the rotating drum at a larger angle than the standard angle. The tape loading mechanism is configured to wind the magnetic tape, and when recording in the standard mode, the pair of SP heads alternately form main information tracks in the standard winding angle range of the magnetic tape, and the main information tracks are alternately formed in the standard winding angle range of the magnetic tape. The first and second sub-information are recorded by alternately using one of the pair of EP heads and the pair of AU heads on the extended line of the magnetic tape and on the part of the magnetic tape that is wound with a large amount of tape. By forming the main information track, a plurality of sub information tracks are formed on an extension line of one main information track,
When recording in the long-time mode, the first main information track is formed in the standard winding angle range of the magnetic tape using the first EP head of the pair of EP heads, and then the first main information track is formed in the standard winding angle range of the magnetic tape. A first sub-information track is formed on the extended line of the main information track and on a portion of the magnetic tape wound with a larger amount, and then the first EP of the pair of sub-information recording/reproducing heads is formed. A second sub-information track is overwritten on the right or left half of the first sub-information track using a first sub-information recording/reproducing head having a different azimuth angle from the head, and then a second sub-information track is formed. A second main information track is formed adjacent to the first main information track in the standard winding angle range of the magnetic tape using a second EP head, and then a second main information track is formed adjacent to the first main information track using the same EP head. A third sub-information track is formed on the extended line of the information track and in a portion of the magnetic tape wound with a larger amount, and then a second sub-information signal is recorded at a different azimuth angle from that of the second EP head. A fourth sub-information track is recorded on the left or right half of the third sub-information track using the playback head.
By overwriting and forming the sub-information track of
A magnetic recording/reproducing device characterized in that a plurality of sub information tracks are formed on an extension of a main information track of a book. (3) The magnetic recording/reproducing apparatus according to claim 2, wherein the pair of AU heads has a larger azimuth angle different from that of the pair of EP heads and the pair of SP heads. . (4) When recording in the standard mode, one main information track and two sub information tracks formed on the same straight line are all formed at different azimuth angles. 3. The magnetic recording/reproducing apparatus according to claim 2, which combines selections of an SP head, an EP head, and an AU head. (5) Magnetic recording according to claim 1 or 2, 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.