JPH0773597A - Tape format - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a tape format compatible with digital signals, which is capable of providing a mechanism system suitable for downsizing of movies and the like while having a function of editing audio signals such as after-recording. [Structure] An audio signal area for two channels is provided independently on the tape end side of a system provided with an area for video signals and audio signals for two or more channels. [Effect] Since the audio signal area of 2 channels is provided independently of the audio signal recorded by movie or the like, a new audio signal can be added without damaging the audio signal already recorded at the time of editing after-recording. Further, when recording with a movie or the like, the area on the side of the tape end is unnecessary, so that, for example, a small diameter system can be applied, and the reduction in size and weight of the movie or the like is not impaired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape format for a recording / reproducing system.

[0002]

2. Description of the Related Art As a system having a plurality of data block areas for voice signals, there is generally a commercial VTR. A conventional business digital VTR has a data block for audio signals in addition to a data block for video signals. For example, Journal of Television Society Vol.47, No.1, p
As shown in p.77 to 80 (1993), there is a video sector at the center in the tape width direction, and two audio sectors at each end. For business use, it has a total of four audio sectors in consideration of editing of audio signals, and can support audio signals of four channels. On the other hand, at the end of the tape, it is generally difficult to reliably secure the tape head contact. Therefore, in order to improve the reliability of the recording / reproducing signal systematically, a specific audio signal data block The channels are swapped for each track so that the tracks do not concentrate on the end of the tape. The method of replacement is different in each system, but the purpose is the same. Therefore, a particular audio signal channel does not continue at the same height in the tape width direction.

On the other hand, in a consumer digital VTR,
In recent years, the number of audio signal channels has become two due to the demand for higher quality audio signals. Also, consumer VT
In R, due to the demand for simplification of the system, unlike the above-mentioned commercial VTR, the height position of the audio signal channel in the tape width direction was not replaced.

[0004]

However, in recent years, VT for consumer use
In R as well, enhancement of the editing function is required, and the post-recording function is particularly demanded. In order to meet this demand, it is necessary to increase the number of data blocks of the audio signal. However, under the condition of a predetermined recording density, it is necessary to increase the drum diameter or the tape winding angle in order to increase the number of data blocks. However, the above countermeasure is a big problem especially for making the movie smaller and lighter. That is, the increase of the drum diameter directly increases the weight of the mechanism, and the increase of the winding angle causes the complexity of the mechanism and makes the device large and heavy.

On the other hand, for the above-mentioned purpose, in the VTR for business use, the height position of the data block for the audio signal is exchanged, so that high-level editing is required at the time of dubbing. Further, when considering a camera-integrated VTR such as a movie, it is necessary to secure an unnecessarily large tape winding angle on the drum, which is not suitable for reduction in size and weight.

An object of the present invention is to provide a tape format which is small in size and light in weight and can secure an editing function by solving the above-mentioned disadvantages of the prior art.

[0007]

In order to achieve the above object, a feature of the present invention is that only data blocks corresponding to specific independent channels of an audio signal are arranged at a predetermined height position of a tape. It is in. Furthermore, the specific data block is arranged on the end side in the tape width direction.

[0008]

The data block for the audio signal is classified into two types. One is recorded in synchronism with the video signal, and the other is recorded later in editing work or the like. In audio data blocks that exist in multiple numbers in one track, a specific data block is located at the end of the tape, and this data block is a specific audio signal that is independent of the signals of other data blocks. Channel,
That is, the post-recording channel is assigned. Therefore,
When recording an audio signal in synchronization with a video signal in a movie or the like, it is not necessary to scan the above specific audio signal data block. As a result, it is not necessary for the mechanism corresponding to the movie or the like to increase the diameter of the drum or the winding angle of the tape, and the mechanism can be simplified and reduced in size and weight.

On the other hand, in a stationary type mechanism that requires editing work, if a required tape winding angle is secured, a new audio signal data block for post-recording can be secured, so recording is performed in synchronization with a video signal. It is possible to edit dubbing and the like without impairing the performance of the audio signal.

[0010]

EXAMPLES Examples of the present invention will be described in detail with reference to FIGS.

First, as shown in FIG. 5, a tape 1 is wound around a drum 2 having magnetic heads a and b over about 180 degrees as seen in a normal VTR. α ₀ is the effective wrap angle, and β ₁ and β ₂ are the inlet and outlet overlap wrap angles, respectively. It is preferable that α ₀ is 180 degrees or less from the viewpoint of simplifying the signal processing system and mechanism. With the minimum required wrap angle, the mechanism does not become unnecessarily complicated or large. 6 is more α than the state shown in FIG.
_The overlap wrap angle is increased by one. β ₃ and β ₄ are the overlap winding angles of the tape ends at this time. In such a mechanism,
The tape winding operation becomes more difficult due to the increase in the winding angle than that shown in FIG. 5, resulting in a complicated mechanism and a large and heavy apparatus.

On the other hand, in a VTR, especially a movie, a small-diameter drum system is often adopted because of the demand for reduction in size and weight. An example thereof is shown in FIGS. 7 and 8. FIG. 7 shows a system in which the drum diameter can be reduced to about 2/3 by mounting four magnetic heads a, b, c, and d. Basically, a so-called small diameter system can be adopted in a system based on a winding angle of about 180 degrees as shown in FIGS. 7 and 8, but a small diameter method is adopted in a system far exceeding 180 degrees as a basic system. If this is attempted, it is necessary to set the winding angle to an angle of 360 degrees or more, so that it cannot be practically adopted. Therefore,
It is necessary to change the way of thinking between systems such as movie that make downsizing and weighting the most important issue, and systems such as stationary that are important to have voice signal dubbing functions.

Next, a first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1A, a track is continuously formed on the tape 1 in a helicopter. V ₀ , V ₁ and V ₂ indicate areas where video signals are recorded respectively, and A ₀ and A ₁ indicate areas where audio signals of 2 channels are recorded. In the present embodiment, the recording position of the audio signal is recorded by exchanging channels up and down by tracks. Thereby, the reliability of the reproduced audio signal can be improved. The area where the video signal V and the audio signals A ₀ and A ₁ are summed up corresponds to the area of the effective winding angle α ₀ shown in FIG. FIG. 1B shows an audio signal area B for post-recording which is further added to the lower end of the above-mentioned tape format. B ₀ and B ₁ represent two-channel audio signal areas, which correspond to the area of the overlap winding angle α ₁ shown in FIG. Particularly in the area near the tape edge, the head tape contact state tends to be unstable, so that the reliability of the reproduced signal can be improved by exchanging the arrangement of the channels B ₀ and B ₁ for each track. The audio signal areas A and B are recorded at different heights in the tape width direction.

Next, a second embodiment will be described with reference to FIG.
In FIG. 2A, the video signal area is divided into two parts, the upper and lower parts, and the audio signal area is formed in the middle. V ₀ ~V ₅ ~
Is a video signal area, and A ₀ and A ₁ are audio signal areas. The sum of these signal areas corresponds to the area of the effective winding angle α ₀ described above. In such a tape format, since the audio signal area can be separated from the tape end portion, the reliability of the reproduced audio signal can be improved. FIG. 2B is a diagram in which an audio signal area B for post-recording of two channels is further added to the lower end of the above-mentioned tape format. This region corresponds to the region of overlap wrap angle α ₁ . Similarly to the above, the audio signal areas A and B are recorded at different heights in the tape width direction.

Further, a third embodiment will be described with reference to FIG.
FIG. 3A shows the audio signal areas A ₀ and A ₁ of the embodiment shown in FIG. 1 arranged adjacent to each other at the upper end of the tape. The area indicated by V is a video signal area as described above. The sum of these signal areas corresponds to the area of the effective winding angle α ₀ described above. FIG. 3B is a diagram in which an audio signal area B for post-recording of two channels is further added to the lower end of the above-mentioned tape format. This area corresponds to the area of the overlap winding angle α ₁ . In this case as well, the audio signal areas A and B are recorded at different heights in the tape width direction, similarly to the above.

Further, a fourth embodiment will be described with reference to FIG.
FIG. 4A shows that the audio signal areas A ₀ and A ₁ of the embodiment shown in FIG. 3 are arranged on the lower end side of the tape with respect to the video signal area V. The sum of these signal areas corresponds to the area of the effective winding angle α ₀ . Figure 4
(B) is 2 more at the lower end of the above-mentioned tape format.
The audio signal area B for post-recording of channels is added. This area corresponds to the area of the overlap winding angle α ₁ . Here, the audio signal area A is also the same as above.
And B are recorded at different heights in the tape width direction.

In the above-mentioned embodiment, the area B arranged for the post-recording of the audio signal is entirely arranged at the lower end portion of the tape, but conversely, even if the area B is arranged at the upper end portion of the tape, the areas B and A of the audio signal area are formed. Naturally, the same effect can be obtained if the spaces are independently configured. Further, in this case, the overlap winding angle α ₁ shown in FIG. 6 is formed between α ₀ and β ₄ on the side opposite to that of FIG.

In the above embodiment, two audio signal channels for simultaneous recording and after-recording are provided, but even if the number of channels is one, it is possible to secure the after-recording function although the quality of the audio signal is inferior. Is natural.

[0019]

As described above, according to the present invention, the after-recording function of the audio signal can be ensured without sacrificing the reduction in size and weight of the movie or the like.

[Brief description of drawings]

FIG. 1 is a tape format according to a first embodiment of the present invention.

FIG. 2 is a tape format according to a second embodiment of the present invention.

FIG. 3 is a tape format according to a third embodiment of the present invention.

FIG. 4 is a tape format according to a fourth embodiment of the present invention.

FIG. 5 is a plan view showing the tape winding around the drum in the case where the audio signal after-recording function according to the present invention is not provided.

FIG. 6 is a plan view showing winding of a tape around a drum having an after-recording function according to the present invention.

FIG. 7 is a plan view showing an embodiment of a small diameter system according to the present invention.

FIG. 8 is a plan view showing another embodiment of the small diameter system according to the present invention.

[Explanation of symbols]

1 ... Tape, 2, 3 ... Drum, V ... Video signal area, A ... Audio signal area, α ₀ ... Effective wrap angle, α ₁ ... Overlap wrap angle.

Claims (2)

[Claims] 1. A recording / reproducing system in which a plurality of signal tracks of a video signal and an audio signal are continuously formed on a tape diagonally, in a signal track area other than a data block area for recording a video signal on one signal track. A tape format, characterized in that at least two types of data block areas for recording audio signals are formed, and at least one type of the audio signal data block areas is independent of signals of other data block areas. 2. A data block, which is kept independent of the signals of other data blocks among the two or more types of audio signal data blocks, is provided at the end side in the tape width direction. The listed tape format.