JPS6310391A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain a stable retrieval that can eliminate malfunction in a quick search mode by recording data showing time as one type of ID data by the combination of time and sec, or min and sec. CONSTITUTION:The ID data showing time from the start point of a tape is reproduced as the combination of time and sec, or min and sec, and the reproduced data is stored in the prescribed place of each memory. If the data showing time gets larger than data that shows time and that was previously reproduced, contents in the memory storing data showing min is set to '0'. If the data concerned decreases, contents in the memory storing the data showing min is set to 59. By using the ID data showing time from the start point of the tape, a stable and quick search is attainable.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention provides an information signal to be recorded and reproduced consisting of a digitized audio signal and an identification signal (hereinafter referred to as data), and which is transmitted while a tape is being transported at high speed. The present invention relates to a magnetic recording/reproducing device having a function of retrieving the position of a tape by reproducing ID data.

2. Description of the Related Art Recently, a method of converting an analog audio signal into a digital signal and recording and reproducing the same has been widely used because it enables recording and reproducing of high-quality audio signals. For example, as shown in Figure 5, according to the 8mm video standard, the amount of magnetic tape wound around the cylinder containing the rotating magnetic head is increased in addition to the conventional wrapping of approximately 180 degrees.
This is achieved by wrapping the tape approximately 36 degrees more than the recording end of the audio signal converted into a digital signal (hereinafter referred to as a PCM signal). In FIG. 5, 1 is a magnetic tape, 2 is a tape running direction, 3 is a head scanning direction,
4 is an overlap section, and 5 and 6 are first and second optional tracks, respectively.

In addition, in the 8 mm video PCM multi-track system standard, one recording track is divided into six tracks as shown in Figure 6, and each track is divided into six tracks using the same method as the PCM signal recording and reproducing method shown in Figure 6. Recording and playback are performed on divided tracks. That is, the PCM signal of one source is BLl-AI, BLl-B1, BLl-A2 .
・Old, etc. are recorded sequentially, and the POM signal of another source C, B
L2-M1, BL2-B1, BL2-A2,...
The tracks are recorded in sequence, and the PCM signals of each track are played back in the same order.

PC for 8mm video and 8mm video PGM multitrack systems as described in Figures 5 and 6.
In the case of the NTSC system, the format of the M recording section is as shown in FIG.
It is divided into blocks, and a 3-bit equivalent sync signal and a 16-bit CRC signal are added and recorded for each block. Then, the 0th block bo, the 1st block b1
．． 44th block b44. 45th block b45. 8th
8-bit ID data is recorded in the 8th block b881 and the 89th block b89.
IDO, ID1, ID2゜ID3. ID4.
It is called ID5. ID1 is used as an inspection code, and seven codes have been determined so far, each of which is named Mode 1 to Mode 7.

The In55 page is called a control word and is determined as ID data common to each mode as shown in FIG.

As mentioned earlier, it is possible to carry many types of information in the IDO inspection code by setting ID1 to ID4, but when playing back ID data while running the tape at high speed, As shown in Figure 7 (IDo
- If ID5 is recorded in a distributed manner, 6
It is extremely difficult to reproduce multiple pieces of ID data at the same time and as data on the same recording track, and it becomes impossible to determine the mode of other ID data (ID2 to ID5) using the IDO inspection code. Data will no longer be available. Mode 7 of ID data has been standardized in view of these points, and is determined as shown in FIG. 8.

ID1 is shown in FIG. 9, and ID2 and ID3 are shown in FIG. 11. Also, ID4 is the 7th bit B7
One of two types of data can be selected by BT
When B7 is O, the data indicates 6 page bars for each program, and when B7 is 1, the data indicates the cut number. As mentioned above, ID5 is a control word common to all modes, as shown in FIG.

Next, ID2 and ID3 in mode 7 will be explained in more detail.

As can be seen from the POM data format in Figure 7, ID2 and ID3 are recorded in two adjacent blocks, so they can be played back at the same time even if the scanning trajectory of the playback head changes in slope from the recording track during high-speed playback. Noting that the probability is extremely high, data is reproduced using a combination of ID2 and ID30. That is,
The 7th bit of ID2 (B7) and the 7th bit of ID3 (B7)
If T) are both 0, as shown in Figure 11(a), it represents the data of minutes and seconds from the beginning of each program, and ID2 (DRY is 1 and B7 of ID3 is 0). Then, as shown in (b) of the same figure, it represents the "hour" and "second" data of the time from the beginning of each program.Similarly, if ID30B7 is 1, (0) and (d) of the same figure As shown, 7A-7 represents the time from the beginning of the tape, and if B7 of ID2 at that time is 0, the data is "minute" and "1 second", and if B7 of ID2 is 1, it is the data of "hour" and "second". Also, B6 and B6 of ID2 are both 0 and B7 is 0.
Then, the data shown in (6) in the same figure, B6 and B6 are both O and B
It is determined that each number 7 represents the data shown in FIG. 7(f). And, Fig. 11(a) to (d)
17) For the data of BO to B6 in cases 2 and 3, use the data converted by the table in Fig. 12,
For the data of ID2 in cases (e) and (f) of the same figure, data converted using the tables of FIGS. 13 and 14, respectively, is used.

Therefore, for example, in an 8 mm video POM multi-track system, by setting the ID data recorded by the A head during high-speed playback to mode 7, even if the mode of the ID data cannot be determined during re-speed playback, the mode 7 ID data.

Problems to be Solved by the Invention However, in an 8 mm video PGM multi-track system, for example, even if you try to perform a high-speed search based on the time from the beginning of the tape using the mode 7 ID data described above, the The time data from the beginning of the tape is either data that shows "hours" and "seconds" or data that shows "minutes" and "seconds," but it is also "hours."

Stable searches cannot be performed because it is not possible to reproduce "minute" and "second" data.

In view of this point, the present invention provides that the ID data indicating the time is "
Even if the data for hours, minutes, and seconds can only be reproduced as a combination of hours and seconds or minutes and seconds, the ID data indicating the time can be used to stabilize the data. An object of the present invention is to provide a magnetic recording/reproducing device that can perform high-speed searches.

Means for Solving the Problems The present invention uses a combination of "hour" and "second" or "minute" and "time" as one of the ID data.
It is configured to be recorded as a combination of "seconds,""hours," and "minutes."

Equipped with a memory for storing the data of "seconds" respectively 9 Heh... and configured to store the reproduced ID data in a predetermined location in the memory respectively.
When playing the data of the combination of
If the data indicating "hour" is larger than the data indicating "1 o'clock" in memory, the data indicating "minute" in memory is set to 0, and the reproduced data indicating "1 o'clock" indicates "hour" in memory. This magnetic recording/reproducing device has a function of setting the data indicating the "minute" in the memory to 59 if it is smaller than the data.

Effects of the present invention With the above-described configuration, when performing a high-speed search using ID data indicating time, when data of a combination of "minutes" and "seconds" is reproduced, the data is stored in the memory as "minutes", "seconds", etc. Store the data in the location where the data indicating "seconds" is stored, and when the data of the combination of "hour" and "second" is played back, the data indicating the reproduced "hour" and the data indicating the "hour" in the memory are If the data indicating the reproduced "hour" is larger, the data indicating the "minute" in the memory is set to O, and the reproduced data is stored in a predetermined location in the memory. However, if the reproduced data indicating the "hour" is smaller, the data indicating the "minute" in the memory is set to 59, and then the reproduced data is stored in a predetermined location in the memory, thereby changing the time. Even when the displayed data can only be reproduced as a combination of "hours" and "seconds" or "minutes" and "seconds," stable searches are possible without causing malfunctions during high-speed searches.

Embodiment FIG. 1 shows a block diagram of the main parts of a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, 9 is a microcomputer, 10 is a key input unit for setting data in the microcomputer 9, 11 is a memory for storing data such as ID data and search positions, and 12 is a memory inside the memory 11. 13 is a POM circuit for recording and reproducing PCM signals and ID data, and 14 is a tape running control circuit for controlling the running of the tape.

The magnetic recording/reproducing 117 of this embodiment configured as described above
- The main device will be explained using an 8 mm video PCM multi-track system as an example.

At the time of recording, the ID data is created by the microcomputer 9 in mode 7 for the human head, and in a predetermined mode input from the key human power section 1o for the B head, and is stored in a predetermined location in the memory 11. At the same time, the PC
It is added to the M circuit 13. The display circuit 12 is connected to the memory 11
The PCM circuit 13 processes and records the ID data and audio signal from the microcomputer 9 using a predetermined method. Since the operation of the PCM circuit 13 is well known, detailed explanation will be omitted. Further, the microcomputer 9 sends a command to the tape running control circuit 14 to control the tape speed to the normal speed, and the tape running control circuit 14 controls the tape speed to the normal speed.

During normal playback, the microcomputer 9 sends a command to the tape running control circuit 14 to control the tape speed to the same speed as during recording, and the tape running control circuit 14 controls the tape speed to the same speed as during recording. controlled. The reproduced PGM signal is processed by the PCM circuit 13, and the PCM circuit 13 outputs an audio signal as well as ID data and a signal (hereinafter referred to as a pointer signal) indicating whether or not each ID data has been correctly reproduced. is sent to the microcomputer 9. The microcomputer 9 determines that I is correct based on the pointer signal.
The mode is determined by IDO only for the D data, the data is reproduced according to each mode, and each reproduced data is stored in a predetermined location in the memory 11. Then, each data in the memory 11 is displayed by the display circuit 12.

Next, the operation during high-speed search will be explained.

First, the key human resources department 10 selects the data to be searched, for example,
Enter the time from the beginning of the tape to be searched. The microcomputer 9 stores the data input from the key input section 1o in a location in the memory 11 that stores the time from the beginning of the tape to be searched, and sends the data to the tape running control circuit 14 to a predetermined short 13 bases.

Time 1: For example, a command is sent to run the tape at a normal speed for 3 seconds. Then, playback is performed for 3 seconds, and the In data played back as described above is stored in the memory 1.
For example, data indicating the time from the beginning of the tape is also stored in the memory 11. When the predetermined 3 seconds of playback is completed in this way, the microcomputer 9 stores the data in the memory 11.
Compare the time from the start of the tape to be searched with the time from the start of the played tape, and if the time from the start of the tape to be searched is greater based on the magnitude relationship, then in the forward direction,
If it is the other way around, a command is sent to the tape running control circuit 14 to run the tape in the opposite direction at high speed. Upon receiving this command, the tape running control circuit 14 causes the tape to run in the specified direction at a predetermined speed, for example, 30 times the speed. While the tape is running at high speed, the PCM circuit 13 operates in the same manner as during playback, but does not output an audio signal, and ID data and its pointer signal are sent to the microcomputer 9. Microcombu 14 In the vane router 9, each time the ID data reproduced by the head is sent, the ID data is processed as In data in mode 7, and only the data determined to be correct by the pointer signal is reproduced. and stored in the memory 11. At this time,
For example, if the reproduced data indicates "hour" and "second" of the time from the beginning of the tape, the data indicating "hour" is stored in the memory 11 as the "hour" of the time from the beginning of the tape. compared with the data showing the newly regenerated “
If the "hour" data is larger, the data indicating "minutes" of the time from the beginning of the played tape in the memory 11 is set to O, and then the data indicating "hours" and "seconds" are stored; If the newly reproduced "hour" data is smaller, the "minute" data is set to 59, and then the "hour" and "second" data are stored.

After reproducing the ID data as described above, the microcomputer 9 compares the time from the beginning of the tape to be searched in the memory 11 with the time from the beginning of the reproduced tape, and determines whether there is a match or an excess of 16 bases. .

If it is determined that this is the case, a stop command is sent to the tape running control circuit 14. The tape running control circuit 14 controls the tape to stop immediately, but mechanical delays and ID
Delays such as data being available only at intervals of, for example, every 60 recorded tracks or more, typically cause the tape to stop at a point slightly beyond the position to be searched. Therefore, a command is sent from the microcomputer 9 to the tape running control circuit 14 to run the tape in the opposite direction and at a slower speed than before, for example, five times the speed. Then, the tape is run at 6x speed by the tape running control circuit 14, and the In data is played back by the POM circuit 13 and the microcomputer 9 in exactly the same manner as described above. If it is determined that there is a match or that the tape has gone too far, a stop command is sent from the microcomputer 9 to the tape running control circuit 14 to end the search.

Here, the reason why the above-described processing is performed when reproducing In data and storing it in memory during a high-speed search will be explained.

Even during high-speed reproduction, if the reproduced data is simply stored in a predetermined location in the memory, as in the case of normal reproduction described above, the following inconvenience will occur. For example, when a tape is run at 30 times the speed of normal playback, each head scans every 30 recording tracks, and if we focus only on the scanning by human heads, it scans about every 60 tracks. This means that you will only be able to scan. Therefore, even if it is possible to always scan the recording tracks recorded by the tape head by some method, ID data in mode 7 can only be played back every 60 recording tracks, that is, every 60 recording tracks recorded on the tape. This is approximately every second.

FIG. 2(a) shows an example in which the time from the beginning of the tape is read using ID data while searching in the forward direction, and each is stored in a predetermined location in the memory. That is, from 0 hours, 59 minutes, and 58 seconds to the time recorded on the tape, the ID data is displayed three times every 117 page seconds as "hour" and "second," respectively.
The case is shown in which the minutes and seconds are played back, and the hours and seconds are played back in that order. In such a case, when the time from the beginning of the tape is 1 hour, 0 minutes, 0 seconds, the memory contents will be 1 hour, 6 minutes.
It becomes 9 minutes 0 seconds. Therefore, for example, if you are trying to search for a time point of 1 hour and 30 minutes, it will be determined that you have gone too far when the memory contents reach 1 hour, 69 minutes, and 0 seconds, as shown in Figure 2 (IL). It ends up. In order to prevent such malfunctions, in the present invention, if the data indicating the reproduced "hour" is larger than the previously reproduced "hour" data, the contents of the memory indicating the "minute" are cleared to 0. I try to do that. Therefore, the memory contents when the data II) is reproduced under the same conditions as in FIG. 2e) according to the present invention are as shown in FIG. 3(e).
IL), and the above-mentioned malfunction can be prevented.

FIG. 2(b) shows an example in which the time from the beginning of the tape is read based on ID data while performing a search in the reverse direction, and each is stored in a predetermined location in the memory. In other words, the time recorded on page 18 of the tape is 1 hour, 0 minutes, 1 second, and II) data is displayed 3 times every 1 second in the opposite direction as "hour" and "
The case is shown in which the numbers are played in the order of "seconds", "minutes" and "seconds", and "hours" and "seconds". In such a case, when the time from the beginning of the tape is 0 hours 69 minutes 59 seconds, the contents of the memory will be 0 hours 69 minutes 0 seconds, so for example, if you are trying to search for the time 0 hours 30 minutes. In this case, when the memory contents reach 0 hours, 0 minutes, and 59 seconds, it is determined that the process has gone too far. In order to prevent such malfunctions, in the present invention, if the ≠ - data indicating the reproduced "hour" is smaller than the previously reproduced "hour" data, the memory indicating the "minute" is I am trying to set the content to 59. Therefore, according to the present invention, when the ID data is reproduced under the same conditions as in FIG. 2(b), the memory contents become as shown in FIG. 3(b), and the above-mentioned malfunction can be prevented.

Next, the procedure for reproducing data from the microcomputer 9 shown in FIG. 1 will be explained in more detail using the flowchart shown in FIG.

Page 19. FIG. 2 shows an example of a flowchart when ID data is processed in mode 7.

ID1 is processed by trench processing 15, and then processing 1 is performed.
At step 6, the pointer signal indicating whether the data of ID2 is correct is determined. If it is determined to be correct, process 17 is executed, and if not, process 33 is executed. In process 17, it is checked by the pointer signal whether the data of ID3 is correct, and if it is correct, process 18 is executed, and if it is not correct, process 33 is executed. Processing 18 determines whether the sixth bit (B6) and the sixth bit (B6) of ID2 are both 0, and if so, processing 19 determines whether I
Change the data of D2 and ID3 to September data or date,
Processed as day of the week data, otherwise process 2
Execute o. In process 20, it is checked whether B7 of ID3 is 1 or not. If it is 1, execute process 21 and subsequent processes that process the time from the beginning of the tape, and if it is 0, execute process 22 that processes the time from the beginning of the program. do. Regarding the processing 22 of the time from the beginning of the program, although not shown, the same processing as the processing of the time from the beginning of the tape, which will be described below, is performed. In process 21, the data of ID3 is converted using the table shown in FIG. 11, for example, and the converted value is stored in the register indicated by person. Then, in process 23, the contents of the register indicated by person are stored in T in memory.
Store in the location indicated by SEG. Next, in process 24, the ID
Determine whether B7 of 2 is 0, and if it is 0, I
Since ID2 is data representing "minutes", processes 26 and 26 are executed; if it is 1, ID2 is data representing "hours", so processes 27 and subsequent steps are executed. In process 26, the data of In2 is converted using the table shown in FIG.
In step 26, the contents of the register are stored in the memory at the location indicated by TMIN. I
If D2 is data representing time, first, in process 27, the data of ID2 is converted using the table in FIG. 11 and stored in the register indicated by A, and in process 28, the contents of that register and THOUR in memory The contents stored in the location indicated by 21 are compared, and if the contents of the register indicated by 21 are larger, processing 29 is performed; otherwise, the comparison is performed again in processing 30, and the register indicated by 21 is larger. If the content of the register is smaller, process 31 is performed; otherwise, process 32 is performed. Process 29 is a process for setting the contents of the memory indicated by TMIN to 0, and process 31 is a process for setting the contents of the memory indicated by TMIN to 69. Further, process 32 is a process for storing the contents of the register indicated by M in the location indicated by THOUR in the memory. That is, in processes 24 to 32, the data indicating the "hour" of the time from the beginning of the newly played tape (the contents of the register indicated by "mu") and the "hour" of the time from the start of the previously played tape are calculated. If the newly reproduced "hour" data is larger, the "minute" data (the content stored in the location indicated by THOUR in memory) is compared. The content stored in the indicated location) is set to 0.
If the newly reproduced "hour" data is smaller, the "minute" data is changed to 69 and 227, -. If the newly reproduced "hour" data is the same as the previous one, the data indicating "minutes" is not changed. After performing a series of these processes, the process 33 performs the fourth process, and finally, the process 34 performs the Ins process to complete the ID data mode 7 process.

As described above, according to this embodiment, the ID data indicating the time from the beginning of the tape can be changed to "hour" and "second" or "minute" and "
If the data indicating the hour is larger than the previously reproduced data indicating the hour, the data is played back as a minute. By setting the contents of the memory containing data indicating "minutes" to 0, and setting the contents of the memory containing data indicating "minutes" to 69 if it is decreasing, the time from the beginning of the tape can be calculated. A stable high-speed search can be performed using ID data indicating the .

In this embodiment, the case where a high-speed search is mainly performed based on the time from the beginning of the tape has been described, but the same applies to the case where a high-speed search is performed based on the time from the beginning of each program.

Further, in this embodiment, the case of an 8 mm video PCM multi-track system has been explained as an example, but the data to be searched is time, and the data is "hour" and "second" or "minute" and " Any recording and playback may be used as long as it is recorded and reproduced separately.

DETAILED DESCRIPTION OF THE INVENTION As described above, according to the present invention, stable and high-speed searches can be performed using ID data related to time recorded as a combination of "hour" and "second" or "minute" and "second". can be carried out, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the main parts of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of time data and memory from the beginning of a reproduced tape to explain the operation of the embodiment. Fig. 3 is an explanatory diagram of the contents of time data and memory from the beginning of the reproduced tape in the same embodiment, Fig. 4 is a flowchart for explaining the operation of the embodiment, and Fig. 5 is a diagram illustrating the contents of the memory. Figure 6 is a pattern diagram showing the tape pattern of 8mm video PGM multi-track system, Figure 7 is a format diagram of the PCM recording section of 8mm video, Figure 8 is 8mm video tape pattern. An explanatory diagram of data recorded as mode 7 of the If) code in a video multitrack system. Figure 9 is an explanatory diagram of the contents of ID1 in Figure 8. Figure 10 is an illustration of the contents of ID5 of the ID code in 8 mm video. 11 is an explanatory diagram of the contents of ID2 and ID3 in FIG. 8, FIG. 12 is an auxiliary diagram of FIGS. 8 and 11, and FIGS. 13 and 14 are auxiliary diagrams of FIG. 1...magnetic tape, 9...microcomputer, 11...memory. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure O Figure 2 Figure 3 Figure 4 Figure 10 (0L *Customer program) Time for each program* Time from the beginning of each program time

Claims (1)

[Claims] Magnetic tape is wound diagonally around a cylinder with a built-in magnetic head to record information signals as a group of discontinuous recording tracks.In addition, one recording track is divided into multiple tracks, and each divided track records information independently. The information signal recorded on each divided track is composed of a digitalized and time-base compressed audio signal and an identification signal, and one of the identification signals is data indicating time. The first format is to record the data as a combination of "hours" and "seconds", and the data indicating the time is recorded as "hour" and "second".
It records in two formats, the second format records as a combination of "minutes" and "seconds", and during playback, the reproduced "hour", "minute", and "second" data are stored in respective predetermined memories. When performing a high-speed search using data indicating the time of the identification signal,
When the data in the first format is reproduced, if the data indicating "hour" is larger than the data indicating "hour" reproduced before then, the "minute" data in the temporary storage device is stored. If the data indicating the "hour" when the data in the first format is reproduced is smaller than the data indicating the "hour" reproduced before then, the temporary storage device A magnetic recording/reproducing device characterized in that data at a location where data for "minutes" is stored is set to 59.