JPS59223905A - Magnetic tape recording method - Google Patents

Abstract

PURPOSE:To make an efficient magnetic tape file possible with a simple constitution by using a no-signal part prepared in a digital data part to make a digital data signal and sound information, which are recorded on two tracks of a tape, coincident with each other with respect to time. CONSTITUTION:In figure, the digital data signal is indicated by 1, and the sound signal is indicated by 2. Several digital data signals 1 conected closely with one another are collected and connected to one another by dummy data 14, and a data header 15 indicating contents of data is provided before them. One data block 10 is constituted with them and a preamble 11 and a postamble 12 of synchronizing signals. A no-signal recording part 13 of 0.5-1 second is provided between data blocks 10, and boundaries of data blocks 10 are recognized by this part 13. If sound information 2 is longer than the digital data signal 1, the signal of the postamble 12 is recorded continuously until sound information is terminated, thereby making the length of the data block 10 and the length of sound information 2 coincident with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape recording method, and in particular, uses a magnetic tape having two tracks that can be played simultaneously as a medium, and a first track of the magnetic tape records an audio signal. The present invention relates to a magnetic tape recording method in which digital data signals are recorded on each second track.

In the past, attempts have often been made to record an audio signal and a corresponding digital signal, such as graphic information, on the same tape-like medium and to reproduce them simultaneously. However, it is known that the biggest problem with this attempt is that the transmission times of the digital data signal and the audio signal are different. One way to solve this problem is, for example, in
No. 7-100461. In this reference, character data corresponding to voice information is recorded in advance in advance of the voice using an asynchronous communication method, and when played back, the character data is stored in a first-in-first-out memory and synchronized with the voice signal to generate a character generator. is configured to output to . However, although this method is effective when digital data is organized into relatively short units such as character information, it is not suitable for synchronizing large amounts of data such as graphic information with audio. However, the transmission efficiency of digital data is low, but the disadvantage is that it requires a long time for transmission.

On the other hand, if a synchronous communication method was used, although the transmission efficiency was high, it would be difficult to synchronize the time with the audio signal, and there was even a risk that the synchronization would be disrupted when starting the tape, making it impossible to reproduce the data.

This invention was made to eliminate the above-mentioned drawbacks of conventional devices, and it collects several pieces of consecutive data that are closely related to each other out of a relatively large amount of digital data such as graphic information. are connected with dummy data to form a data block, which is recorded using a synchronous communication method with high transmission efficiency.The non-signal section provided in the digital data section is used to synchronize the time with audio information such as explanations. It is an object of the present invention to provide a magnetic tape recording method that allows a highly efficient magnetic tape file to be created with a simple configuration.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram of a recording format on a magnetic tape showing an embodiment of the present invention. In the figure, 1 is a digital data signal corresponding to, for example, one screen of graphic information, and 2 is an audio signal such as an explanation for the digital signal 1. Several closely related digital data signals 1 are grouped together and connected to each other by dummy data 91, and preambles 11 . ll+? A signal called a store sample 12 for establishing data synchronization is recorded, and a data ladder 15 is provided in front of each digital data signal 1 to indicate the existence of that data. That is, preamble 11
．． One data block 10 is composed of each data ladder 15, digital data signal 1, dummy data 14 between them, and postamble 12. Further, a non-recording section 13 of about 0.5 seconds to 1 second is provided between the data blocks 10, so that the boundary between the data blocks 1o can be recognized. Then, data reading from the next preamble section 11 is started.

FIG. 2 is an example showing the configuration of the ladder 15 for the above data.
5a is, for example, a block header 10. Graphic data 21. 15b is a block number, 15c is a data number, and 15d is a data length consisting of 4 bytes.

Based on the above configuration, a magnetic tape recording method according to an embodiment of the present invention will be explained.

First, regarding the method of starting the tape, if starting the tape is performed in the non-recording section 13, then the preamble section 11
Since the data is synchronized at , there is no problem in reproducing the digital data signal 1.

Also, for data such as graphic information, it is almost meaningless to start reading from the middle of the data.
When starting a tape from a location other than the above-mentioned non-recording section 13, it is possible to start playback after accessing either the preceding or following non-recording section 13. Data playback is guaranteed even if

Next, there is a specific method for matching the transmission times of the audio information 2 and the digital data signal 1, which can be realized as follows.

First, the transmission time of the audio information 2 is the same as that of the digital data signal 1.
It is clear that the audio information 2 may be recorded at any location in the data block 10 if the transmission time is shorter than the transmission time of . If the audio information 2 is longer than the digital data signal 1, the length of the data block 1o can be adjusted to the length of the audio information 2 by continuously recording the signal of the postamble 12 until the end of the audio. I can do it. Therefore,
As a result, even when the data transfer speed is increased and the transmission time is shortened, the length of the audio information 2 and the length of the data block 1o can be matched as shown in FIG. 1. Also, data that is closely related to each other can be stored in one data block 1.
Since it is summarized in 0, use Ladder 15 to the data,
It is also possible to read and prepare the next image data while displaying a certain graphic image and giving an audio explanation.

Furthermore, when searching for data, the method of detecting silent parts of an audio signal may erroneously detect unintended silent periods 21 due to Bianissimo or breathing. In the case of the detection method, it is extremely easy to distinguish between the data block 10 and the non-recorded portion 13, so there is little risk of malfunction. Random access is also possible in block units.

As described above, according to the magnetic tape recording method of the present invention, it is possible to easily match the transmission time of a relatively large amount of digital data signal such as graphic information and audio information recorded on two tracks on a tape. Since it is possible to use a highly efficient synchronous communication method for transmitting digital data, it is very effective when creating a data file using a tape-like medium. Also,
In particular, when a tape-like medium according to the method of the present invention is used as a graphic image file, it is possible to prepare the next image data while displaying a certain image and explaining it by voice. , it is possible to shorten waiting time. Furthermore, the practical effect of being able to stably and easily detect boundaries between data can also be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram of a recording format on a magnetic tape showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a first fixing section. 1...Digital data signal, 2...Audio information, 1
1... Preamble, 12... issue? store amplifier,
13... No recording portion on the data track, 14... Dummy data, 15... Data header, 21... Silent period on the audio track. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa

Claims (1)

[Claims] In a magnetic tape recording method that has two tracks that can be played back simultaneously and records an audio signal on the first track and a digital data signal on the second track, A digital data signal of a group including a data header that is prefixed to each of the above-mentioned mutually related data and represents the content of the data, and dummy data that connects each data to which the above-mentioned data header is added. A data block is configured by adding signals for establishing data synchronization before and after the
By using means for providing a non-recording portion of about 0.5 seconds to 1 second between the data blocks, the second track is recorded according to the length of the audio information recorded on the first track. 1. A magnetic tape recording method characterized in that recording is performed by changing the length of a data synchronization establishment signal added to a track or the dummy data.