JPH044673B2 - - 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 (hereinafter referred to as "first-in, first-out memory").
It is configured to store the signal in a FIFO (abbreviated as FIFO) and output it to the character generator device in synchronization with the audio signal. However, the method cited in this example is
This method is effective when digital data is organized into relatively short units, such as character information, but when it is desired to synchronize large amounts of data, such as graphic information, with audio, the transmission efficiency of digital data is Unfortunately, it had the disadvantage of requiring a lot of 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 the tape was started, making it impossible to reproduce the data.

This invention was made in order to eliminate the above-mentioned drawbacks of conventional devices, and it records a relatively large amount of digital data such as graphic information using a synchronous communication method with high transmission efficiency, and records audio information such as explanations. The purpose of the present invention is to provide a simple and highly efficient magnetic tape recording method by utilizing the non-signal area provided in the digital data area to adjust the time with the digital data area.

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

FIGS. 1 and 2 are diagrams showing an example of a recording format of a magnetic tape used in 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. Data synchronization signals called preamble 11 and postamble 12 are recorded before and after the digital data signal 1, respectively, and these preamble 11, digital data signal 1, and postamble 12 constitute one data block 10. Ru. Furthermore, the data block 10 and the data block 10
There is a non-recorded part of about 0.5 seconds to 1 second between
is provided, and the boundary between the data blocks 10 is recognized by this non-recording section 13, and data reading is started from the next preamble section 11.

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 the tape is started in the non-recording section 13, the data will be synchronized in the preamble section 11, so there will be 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, data 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 by the following method.

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. When 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 signal 12 until the end of the audio. Therefore, 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 10 can be matched as shown in FIG. 2.

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.

As described above, according to the 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. In addition, since a highly efficient synchronous communication method can be used to transmit digital data, it is highly effective when creating a data file using a tape-like medium. Furthermore, the practical effect of being able to stably and easily detect boundaries between data can also be obtained.

[Brief explanation of drawings]

1 and 2 are recording format diagrams on a magnetic tape showing an embodiment of the present invention. 1... Digital data signal, 2... Audio information, 11... Preamble, 12... Postamble, 13... Unrecorded portion on data track, 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 magnetic tape is recorded on the second track. A preamble and a postamble of a data synchronization signal are added before and after the digital data signal to form a data block, and by changing the length of the postamble of the data synchronization signal, the length of the data block can be changed to the first data block.
0.5 between the data blocks recorded on the second track and the length of the audio information recorded on the second track;
1. A magnetic tape recording method comprising: means for providing a non-recorded portion of approximately 1 second to 1 second.