JPS59101012A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To record efficiently information, by dividing signals which are not necessary to be recorded at every block out of identification signals into plural blocks, and recording them over plural blocks. CONSTITUTION:The device of this invention is provided with a means 11 for generating the 1st information whose changing cycle corresponding to a main signal is short and which is necessary to be recorded at every block, means 12 for generating the 2nd information whose changing cycle corresponding to the main signal is long and which are not necessary to be recorded at every block, and an identification signal implementing means 13 which divides the 2nd information signal into plural divided information signals and sets them to the same respective prescribed positions in a block. In addition to the above, an information value detecting means 17 which outputs respective outputs when the 1st information signal in identification signals reproduced by a a reproducing means 15 becomes different prescribed information values, and the 2nd information decoding means 18 which decodes the 2nd information signal by extracting the information value of the prescribed position of the identification signal in response to the output of the information value detecting means 17, are also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a recording and reproducing apparatus for recording and reproducing digital signals obtained by converting video signals and analog signals, and digital signals representing other information.

Conventional Structures and Problems The method of converting an analog audio signal into a digital signal and recording and reproducing the same has recently been widely used because it allows high-quality audio signals to be recorded and reproduced. By converting an analog audio signal into a digital signal, it is easy to divide and merge the signals, so you can use a device that can record and play back video signals, such as a video tape recorder (hereinafter abbreviated as VTR), along with the video signal. It becomes possible to record and reproduce the digital signal using a video head. VTRs that are currently widely used use two heads to alternately record and reproduce video signals one field at a time. When either one of the two heads is recording or reproducing a video signal, the other head is not recording or reproducing. If the digital signal is recorded or reproduced using a head that does not perform recording or reproduction, efficient signal recording and reproduction can be achieved. To achieve this, as shown in FIGS. 71 and 2, both heads 3.4 may be brought into contact with the tape 1 for a period necessary to record and reproduce digital signals. Note that 2 is a cylinder.

When the head 3.4 and tape 1 are in the positional relationship as shown in Figure 1, the signal train of each head 3.4 is as shown in Figure 3 (At
i, (As shown in Bl and FIG. 5, 1-field video signals S□ are alternately located,
After the processing, an audio signal corresponding to a period corresponding to one field of the video signal is located as a digital signal S2.

Furthermore, when the head 3.4 and the tape 1 are in the positional relationship as shown in Fig. 2, the signal train of each head 3.4 is as shown in Fig. 4 (
As shown in A), (B) and FIG. 6, the 1-field video signals S
In front of □, an audio signal corresponding to a period corresponding to one field of the video signal is located as a digital signal S2.

As shown in FIGS. 7(3) and (B), the digital signal is generally divided into a plurality of sample data SD so that error correction can be performed, and a synchronization signal 5YNC and an error detection signal C
Add and configure the frame. , a plurality of frames F are collected to form the digital signal Q of audio for one field. It is possible to further add digital data as an identification signal P to this digital signal Q for realizing various types of control and signal processing. This digital data includes time information. If you enter the field number,
Video signal editing work can be done with high precision. In addition, information for determining whether the audio is stereo or monaural can also be included.

However, when recording one field's worth of video signal S□, digital signal Q, and identification signal P as one block, if all of this information is recorded for each block,
The identification signal area increases, resulting in an increase in the overall recording capacity. Further, if the recording area is limited, problems arise such as the need to increase the recording density.

Purpose of the Invention The present invention provides a recording and reproducing device for recording and reproducing main signals such as video signals and digital signals converted from analog signals, and identification signals, in which a large amount of information can be efficiently recorded within a limited identification signal area. The object of the present invention is to provide a recording/reproducing device that can be used effectively.

Composition of the Invention The recording and reproducing apparatus of the present invention divides the identification signal into first information recorded for each block and second information that does not need to be continuously recorded for each block, and The writing location is determined in advance using the first information, and the second information is divided appropriately depending on the amount of the second information or the size of the area of the identification (i), and the second information is divided into multiple blocks. The identification signal area is effectively utilized by recording nine signals across the area.

DESCRIPTION OF THE EMBODIMENTS As shown in FIG. 8, this magnetic recording and reproducing apparatus records main signals such as digital signals obtained by converting video signals and analog audio signals and identification signals into blocks on a magnetic tape. , a magnetic recording and reproducing apparatus for reproducing information from the magnetic tape, and a first information generating means 11 that generates a first information signal that has a short change period corresponding to the main signal and that needs to be recorded for each block. a second information generating means 12 that generates a second information signal that has a long change period corresponding to the main signal and does not need to be recorded for each block; The first information signal is set for each block, and the first information signal is set at the same predetermined position in the block where the first information signal has a tth different predetermined information value. an identification signal creation means 13 for setting each of the identification signal creation means 13, a recording means 14 for recording the identification signal created by the identification signal creation means 13 together with the main signal, and a reproduction means 15 for reproducing the main signal and the identification signal; A first information decoding means 16 decodes the first information signal from the identification signal reproduced by the reproduction means 15, and a first information signal in the identification code reproduced by the reproduction means 15 is used to decode the first information signal from the identification signal reproduced by the reproduction means 15. Information value detecting means 17 generates an output when different predetermined information values are obtained, and the information value at a predetermined position of the identification signal is extracted in response to the output of the information value detecting means 17. and second information decoding means 18 for decoding the second information signal. Note that 19 is a video signal input terminal, 20 is an audio signal input terminal, and 21
2 is a video signal output terminal, and 22 is an audio signal output terminal.

I will explain it in detail below. For example, if the digital signal is considered to be a signal of 8 bits per word, it is advantageous in terms of circuit scale and the like to make the identification signal also 8 bits per word. An example of a format representing time information in the identification signal' in this case is shown in the table below.

Word W. - W3 is 11 times each recorded on tape.
Each word W represents information (hour 1 minute 9 seconds, field number). -W3 is B. - Consists of 8 bits of B7. Word W representing time information. needs to represent 0 to 23, so the lower digits 0 to 9 are B. Using 4 bits of B3 from
The upper digits θ~2 are expressed by 2 bits B4 to B5.

In addition, the word W, w2. represents the minute and second and the field number. W3 needs to represent all θ Rikishima et al. 59, so the lower digits 0 to 9 are B. 4 bits from B3,
Three bits from B4 to B6 are used for the upper digits O to 5. At this time, a word W representing time information. - Of the 32 bits of W3, the 5 bits indicated by one mark in the table are the first information, 9 minutes and 1 second, and are not used to record the field number (hereinafter referred to as empty bits). Of the time information, such as January 9, 2017, is not necessary for controlling tape editing, cueing, etc., and therefore does not need to be recorded for each block. Therefore, divided recording over multiple blocks is possible. If the tape was recorded on December 26, 1980, each digit would be 1, 9, etc.
Since 8.0.1.2 and 2.6 can each be expressed with 4 bits, these pieces of information can be sequentially recorded using 4 bits among the free bits. These second
In order to reproduce the information, the second information is recorded in advance in accordance with the first information, for example, a specific field number, which is continuously recorded in each block during recording.

For example, the information for 1 in 1980 is sequentially recorded in an empty bit in the block where field number 1 is recorded, the information for 9 is recorded in the empty bit in the block where field number 10 is recorded, and when playing back, is the year set in advance like this. This is possible by detecting the field number of the block in which the information for the 2nd of the month is recorded and obtaining information about the empty bits of that block. In this way, information for January 1, 2016 can be recorded using the 4 bits in each block.

! Also, if September 1st of the year is expressed as a binary number, 1 dl of the year
The month can be expressed using 4 bits, and the day can be expressed using 5 bits.

In this case, the year should be divided into three blocks, and the month and day should each be recorded in one block.

In this way, this embodiment uses the hour of the time information.

Minutes and 1 second, field numbers are recorded for each block as the first information signal, and time information of January 9, 2018 is recorded as the second information signal, which is divided into multiple divided information signals and each Since the divided information signals are recorded at predetermined positions within the block where the first information signal has different information values, more information can be recorded in a smaller identification signal recording area. In addition, the second information signal is divided according to the number of empty bits in the identification information, and the divided divided information signals are recorded in the empty bits, so the identification signal recording area can be used effectively and the memory can be saved. The increase can be prevented.

Effects of the Invention The recording and reproducing apparatus of the present invention divides the identification @ symbol that does not need to be recorded in each block into a plurality of blocks and records it over a plurality of blocks, so that information can be recorded efficiently. can.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams showing the relationship between the head and tape of a conventional video tape recorder, and Figure 3 (Al,
(B) and Figure 4 (Al and fBl are the first
FIGS. 5 and 6 are respectively explanatory diagrams of the recording state on the tape, and FIGS. Fig. 8 is a block diagram of an embodiment of the present invention. 11... First information generation means, 12... Second information generation means, 13... Identification signal generation means, 14... Recording means, 15... Reproducing means, 16... First information restoring means, 17... Information value detection means, 18... Second information restoring means

Claims (1)

[Claims] A recording and reproducing device that records a main signal and an identification signal of one field as one block and reproduces them,
first and second short and long change periods corresponding to the main signal;
and a second information generating means for generating an information signal, dividing the second information signal into a plurality of divided information signals, setting the first information signal for each block, and dividing the second information signal into a plurality of divided information signals. identification signal generating means for setting the information signals at the same predetermined positions in the blocks where the first information signals have different predetermined information values; A recording means for recording together with the main signal, a reproducing means for reproducing the raw signal and the identification signal, and an identification M reproduced by the reproducing means.
a first information decoding means for decoding a first information signal from the first information signal from the first information signal; information value detection means for generating an output; and second information decoding means for decoding the second information signal by extracting the information value at a predetermined position of the identification signal in response to the output of the information value detection means. A recording and reproducing device equipped with.