JPS6352302A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the picture quality by separating a luminance signal and a chrominance signal from each other and providing private recording tracks for respective signals. CONSTITUTION:A YC separating video head, a current video head, and an audio head are arranged on the same rotating cylinder at a certain angle and with a certain step. In case of YC separation recording system, the audio track recorded by the audio head is recorded in a layer deeper than the video track recorded by the YC separating video head; and in case of the frequency multiple recording system, the audio track recorded by the audio head is recorded in a layer deeper than the video track recorded by the current video head. A sufficient recording signal band is taken and the resolution of Y, that of C, and S/N of color are improved because YC separation recording and reproducing heads are provided and recording tracks only for Y and C are provided, and after-recording is possible because an audio signal tracks is recorded between video signal tracks without overlapping in the double speed mode.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording and reproducing apparatus that records and reproduces signals on a magnetic tape using a rotating magnetic head.

(Prior Art) FIG. 5 is a signal format diagram of a conventional home VTR color signal low frequency conversion recording method.

The conventional video signal recording method of a home video tape recorder (hereinafter referred to as VTR) is to record a luminance signal (Y) on an FM carrier (FM carrier 3.4 to 4.4 MHz in the case of the VH3 method) as shown in Figure 5. ,,The color signal (C) is subjected to frequency conversion (629KHz in the case of VH8 system) to the localization device,
The brightness signal is recorded with bias using FM waves.

Since the color signal is converted to a low frequency signal for recording and reproduction, it is less susceptible to time axis fluctuations in the tape running system, and is widely used around the world as a low-cost home VTR.

The audio recording method uses a rotating audio head to record FM deep into the magnetic tape.

In the case of the VH3 system, the carrier frequency is set to 1.3 MHz and 1.7 MHz in stereo, providing Hi-Fi sound.

FIG. 6 is a configuration diagram showing the arrangement of magnetic heads on a rotary cylinder and the head level difference in a conventional example.

In FIG. 6, the video heads 1 and 2 are arranged on a rotary cylinder 5 with an angle α and a step β so as to overlap the rotary audio heads 3 and 4 on the tape track pattern.

FIG. 7 is a diagram of a track pattern on a conventional magnetic tape at the time of a standard moat.

As a specific example, α=906. β=31 μm, video head width 30 μm, audio head width 26 μm.

Then, the tape track pattern in the standard mode of VH3 has a track pitch of 58 μm, as shown in FIG.
The trunk 8.9 recorded by the video heads 1 and 2 is superimposed and recorded on the trunk 6.7 deeply recorded by the audio heads 3 and 4 at the center of the frame.

In the conventional example, in the case of VH3, the azimuth of video heads 1 and 2 is -6 degrees, where 1 is +6 degrees, and the azimuth of audio heads 3 and 4 is -30 degrees, where 3 is +30''. In addition to the above, FIG. 8 is a diagram of a tape track pattern in a double speed mode in which the tape speed is increased, and FIG. 9 is a diagram of a video signal recording format in a triple mode.

(Problems to be Solved by the Invention) In the conventional example, improvement in sound quality is being satisfied with the FM recording system, but improvement in image quality is not expected, and the S/N ratio is reduced to 1 due to improvement in tape performance. The increase is approximately 2 dB.

Therefore, the future broadcasting system will be EDTV (signal band 6MHz).
), the performance of current home VTRs is not sufficient.

Furthermore, in the conventional example, the video signal is superimposed on the audio signal (deep recording of the audio signal) and recorded on the magnetic tape.
So-called after-recording (dubbing), which records a new audio signal while leaving the recorded video signal intact.
The problem was that it was impossible to do so.

(Means for Solving the Problems) In order to solve the problems in the conventional example, the present invention separates the luminance signal and color signal separately and provides dedicated recording tracks for each in order to improve image quality. a rotary cylinder mechanism equipped with a Y (luminance) and C (color) separated recording and reproducing head, which makes it possible to increase the recording signal band;
By increasing the tape speed and setting not only the standard mode but also the double speed mode, it is possible to satisfy the condition that the video signal track and the audio signal track are recorded independently on the magnetic tape without overlapping. The rotary cylinder is equipped with an audio signal erasing head that erases only the audio signal trunk on the tape.

(Function) Equipped with Y and C separate recording and playback heads, and providing Y-only and C-only recording tracks, a sufficient recording signal band can be obtained, and Y resolution, C resolution, and color S/
Since the double-speed mode allows audio signal tracks to be recorded without overlapping video signal tracks, post-recording becomes possible.

By the rotating head cylinder configuration of the present invention.

A high-quality home VTR with high image quality and dubbing capability is provided.

(Example) The magnetic recording and reproducing apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the arrangement of magnetic heads on a rotating cylinder according to an embodiment of the present invention.

In FIG. 1, magnetic heads 11 and 12 mounted on a rotary cylinder 10 are rotary audio heads, and magnetic heads 13 and 14 are rotary video heads, which are double azimuth heads for recording and reproducing the standard mode and triple mode of recording time, respectively. It is a combination head (standard for a video head, 3
The explanation is the same for a two-head configuration with a dual-purpose head).

The magnetic heads 15 and 16 perform rotary erase (rotary erase) with a certain angle and step in each head arrangement so as to erase the audio tracks recorded by the audio heads 11 and 12 when the tape speed is in double speed mode. )) is the head.

The magnetic heads 17 and 18 are the main recording and reproducing heads for YC separation of the present invention, and in one embodiment shown in FIG. There is.

FIG. 2 is a diagram of a track pattern in a standard mode on a magnetic tape according to an embodiment of the present invention.

The relationship between heads A4 and B- is the second one indicating the trunk pattern.
As shown in the figure, the standard moat of a VTR has a stepped arrangement to enable two-channel recording with YC separation.

Taking VH3 as an example of a current home VTR, the track pitch is 58 μm in the standard mode, so heads A" and B-, which record separately in YC, form a track pattern of 29 μm, and as shown in FIG. 1 field (1/
60sec) is recorded Y on A14 of head 17, C is recorded on Bi-, the next field is recorded Y on A2'''' of head 18, B
C recording is performed in step 2-, and thereafter, the Y signal is sequentially recorded in the A head and the C signal is recorded in the B head.

The audio signal at this time is the rotating audio head 11,
Deeply recorded by 12.

The head width of the YC separation head is 29 μm for overwriting.
It is wider, and is set to about 40 μm, which is smaller than 58 μm.

FIG. 3 is a tape track pattern diagram in a double speed mode in which the tape speed is increased.

As shown in FIG. 3, audio tracks 19 and 20 recorded by the audio heads 11 and 12 are recorded in the guard band between the YC-separated video tracks,
Only audio tracks 19 and 20 can be recorded, played back, and erased, allowing for after-recording.

FIG. 4 is a signal format diagram of the YC portion recording method in the embodiment of the present invention.

As for the signal recording method, the luminance (Y) signal is FM recorded by the A head, and the color (C) signal is FM recorded by the B head.

Color signal recording methods include a method in which color difference (R-Y, B-Y) signals are recorded in FM-FM at two frequencies each, and a method in which color difference signals are compressed on the time axis and recorded in F2V1 in one frequency. There are various possibilities such as.

As shown in Figure 2, the method of separating Y and C signals and recording nine Y signals and nine C signals each on a dedicated track allows a wide recording band, so the luminance signal band is 4M) or more, and the limit resolution is 300 lines. As mentioned above, the color signal band is becoming wider than IMHz, and the S/N is improved by increasing the resolution of the color signal and FM recording.
Improvements can also be expected.

By adopting the head arrangement on the rotating cylinder and the signal recording method explained above, the current home VTR
(VH8' in the embodiment) and a new high-quality YCC component system are possible.

Furthermore, by doubling the tape speed in standard mode, a track pattern in which the rotating audio trunk does not overlap with the video track is formed, allowing for after-recording, resulting in revolutionary high image and sound quality. To make it possible to realize a home-use VTR.

As an example in which an audio track is formed between video tracks (guard band) in double speed mode, the conventional example shown in FIG. ) and step (β31μm)
In the case of the VH3 system, in which the magnetic tape is arranged in the rotating cylinder 5, the track pattern on the magnetic tape in the standard mode is audio track 6.7, as shown in FIG.
is recorded deep below video tracks 8 and 9.

If you keep this head arrangement and increase the tape speed to double the standard mode, the standard mode track pitch will be VH.
In the case of S, the thickness is doubled from 58 μm to 116 μm, and the audio track 6.7 is formed between the video tracks 8 and 9 (girt band) as shown in FIG. 8, making it possible to rewrite only the audio track.

The arrangement of the YC separation heads 17, 18 and the audio heads 11, 12 in FIG. 1 in the rotary cylinder 10 has been explained in FIG.

Since the arrangement of the video heads 1, 2 and the audio heads 3, 4 on the rotary cylinder 5 is the same, the track pattern of the magnetic tape in the double speed mode is recorded with the audio heads 11° and 12, as shown in FIG. Audio tracks 19 and 20 are recorded on the guard band between the YC-separated video tracks, and only audio tracks 19 and 20 can be recorded, played back, and erased, allowing for after-recording.

Further, the rotary erase heads 15 and 16 have a certain angle and step on the rotary cylinder 10 so that they can trace the audio tracks 19, 20 so as to erase only the audio signal.

In the configuration according to the embodiment of the present invention, since the YC separation method aims at high image quality, the track width becomes narrow to realize the 3x mode of VH3, which is difficult from the viewpoint of S/N.

As shown in Figure 9, high image quality in 3x mode is achieved by increasing the brightness (Y
) A method that aims to improve resolution by converting only the signal to a high band is good. Standard mode and double speed mode are YC separation recording methods, and 3x mode is the VH8 method of color signal low frequency conversion, and the luminance signal is high. Achieves high image quality using a banded method.

On the other hand, for high quality sound, FM Hi Fi or P
CM is considered, and in the standard mode and the 3x mode, deep recording is performed using a rotary head for audio transmission, and in the double speed mode, guard band recording is performed between video tracks.

(Effects of the Invention) As explained above, according to the present invention, the conventional household V
TR had limited performance, but the YC separation recording system has improved image quality, and the double speed mode has made it possible to perform high-quality FM Hi Hi or PCM after-recording.

According to the head configuration on a rotating cylinder of the present invention, recording and reproduction of conventional home VTRs is also possible.

[Brief explanation of drawings]

Fig. 1 is a diagram of the arrangement of magnetic heads on a rotating cylinder according to an embodiment of the present invention, Fig. 2 is a diagram of the trunk pattern in standard mode on a magnetic tape according to an embodiment of the present invention, and Fig. 3 is a diagram of increasing tape speed. Figure 4 is a format diagram of the YC separation recording method according to the embodiment of the present invention; Figure 5 is a signal format diagram of the color signal low frequency conversion recording method of a conventional home VTR. , Figure 6 is a configuration diagram showing the arrangement of magnetic heads on a conventional rotary cylinder and the head height difference, Figure 7 is a diagram of the track pattern on a conventional magnetic tape in standard mode, and Figure 8 is a diagram showing the magnetic head arrangement on a conventional rotating cylinder. FIG. 9 is a diagram of the tape track pattern in the double speed mode, and FIG. 9 is a diagram of the video signal recording format in the triple speed mode. 11.12...Rotary audio recording and reproducing head,
13.14 ... Video head for recording and playback, 15.1
6... Rotary erase head, 17.18...
・YC separate recording/playback video head. Patent applicant: Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] (1) A YC separation video head that separates the luminance signal (Y) and chrominance signal (C) and records and reproduces them, a current video head that records and reproduces the luminance signal and chrominance signal by frequency multiplexing, and a normal recording head. In the time mode, the video head is equipped with an audio head for recording and reproducing an analog FM or digital PCM audio signal in the deep layer of the video track recorded by either method, and the YC separation video head, the current video head , the audio heads are arranged on the same rotating cylinder at a certain angle and with a certain step difference, and in the case of the YC separation recording method, the audio track recorded by the audio head is recorded by the YC separation video head. The audio track is recorded deep below the video track, and even in the case of a frequency multiplexed recording method, the audio track recorded by the audio head is deep recorded below the video track recorded by the current video head. Magnetic recording and reproducing device. (2) By increasing the tape speed from the tape speed in the normal recording time mode, the audio track recorded by the audio head is recorded using the YC separated recording method, the YC separated video head, or the frequency multiplexing recording method; Claim (1) characterized by having a recording time mode that enables after-recording of only audio signals recorded between video tracks recorded by the video head, which is a current video head. The magnetic recording and reproducing device described above. (3) The recording mode that allows dubbing and the normal standard mode are characterized by recording and playback using a YC separation video head, and the 3x mode is characterized by performing frequency multiplexed recording and playback by converting the luminance signal into a high band using the current video head. A magnetic recording/reproducing device according to claim (1).