JPH044674B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape recording method, and in particular, uses a magnetic tape as a medium having two tracks that can be played back simultaneously, an audio signal is stored on the first track of the magnetic tape, and an audio signal is stored on the second track of the magnetic tape. The present invention relates to a magnetic tape recording method for recording digital data signals on each 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 JP-A-57-
No. 100461. In this reference, character data corresponding to audio information is recorded in advance in advance of the audio using an asynchronous communication method, and when played back, the character data is stored in a first-in, first-out memory, and is synchronized with the audio signal to generate character data. configured to output to a generator device. However, although this method is effective when digital data is organized into relatively short units, such as text information, it is not suitable for synchronizing large amounts of data, such as graphic information, with audio. The disadvantage of this method is that it has poor digital data transmission efficiency and 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 in order to eliminate the above-mentioned drawbacks of conventional devices.
A data block is created by putting together several pieces of consecutive data that are closely related to each other, connecting each piece of data with dummy data, and recording it using a synchronous communication method with high transmission efficiency, and then synchronizing the time with audio information such as explanations. It is an object of the present invention to provide a magnetic tape recording method capable of producing a highly efficient magnetic tape file with a simple configuration by configuring this to be performed using a non-signal section provided in the digital data section.

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

FIG. 1 is a recording format diagram of 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 data signal 1. Several of the digital data signals that are closely related to each other are grouped together and connected to each other by dummy data 14, and signals for establishing data synchronization called preamble 11 and postamble 12 are recorded before and after the dummy data, respectively. Additionally, a data header 15 is provided in front of each digital data signal 1 to indicate the content of the data. That is, one data block 10 is composed of the preamble 11, each data header 15, the digital data signal 1, the dummy data 14 between them, and the postamble 12. Furthermore, there is a gap of 0.5 between the data blocks 10 and 10.
A non-recording section 13 of about 1 second to 1 second is provided, so that the boundary between the data blocks 10 can be recognized, and data reading starts from the next preamble section 11.

FIG. 2 shows an example of the structure of the data header 15, in which 15a is a data type that distinguishes the contents of the block header 10, graphic data 21, program data 31, synthesized audio data 41, etc., 15b is a block number, and 15c is a block number. The data number 15d is the data length and consists 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, the data will be synchronized in the preamble section 11.
There is no problem in reproducing the digital data signal 1.
In addition, for data such as graphic information, it is almost meaningless to start reading from the middle of the data, so when starting the tape from a location other than the blank area 13, it is necessary to If a method is adopted in which playback is started after accessing the recording unit 13, disk playback is guaranteed no matter what state the tape is loaded in.

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, it is clear that if the transmission time of the audio information 2 is shorter than the transmission time of the digital data signal 1, the audio information 2 may be recorded at any location in the data block 10. If the audio information 2 is longer than the digital data signal 1, the length of the data block 10 can be made to match the length of the audio information 2 by continuously recording the postamble 12 signal until the end of the audio. . Therefore,
As a result, even when the data transfer speed is increased and the transmission time is shortened, it is possible to match the length of the audio information 2 and the length of the data block 10 as shown in FIG. Also, since data that is closely related to each other is grouped into one data block 10, the data header 15 can be used to display a certain graphic image and read the next image data while explaining it with voice. If you prepare it, you can use it as well.

Furthermore, when searching for data, the method of detecting silent parts of an audio signal may erroneously detect unintentional silent periods 21 due to pianissimo or breathing, but it is possible to detect unrecorded parts 13 of digital data tracks. In the case of this 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 the 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 one 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 the main part of FIG. 1... Digital data signal, 2... Audio information, 11... Preamble, 12... Postamble, 13... Unrecorded portion on data track, 1
4...Dummy data, 15...Data header, 2
1... Silent period on the audio track. In addition, in the figure,
The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1 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, the 1 track that is recorded on the second track is 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 has been added, and that are arranged before and after a group of digital data signals. A preamble and a postamble of a signal for establishing data synchronization are added to the data synchronization to form one data block, and the length of the data block can be changed by changing the length of the postamble of the signal for establishing data synchronization or the length of the dummy data. means for making the length approximately equal to the length of the audio information recorded on the first track; and a non-recording portion of about 0.5 seconds to 1 second between data blocks recorded on the second track. 1. A magnetic tape recording method, comprising means for providing.