JPH04247382A - Magnetic tape recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform the retrieval operation of a magnetic recording and reproducing device effectively and in a short time. CONSTITUTION:First identification data ID1 that is absolute time information is recorded on the sub data recording area of a track R, and second identification data representing the fact that continuous plural tracks R exist in a leading specific area on the sub data recording area of each track R in the leading specific areas from the forefront to a constant section out of the recording areas of main data consisting of the tracks R, and furthermore, the first identification data ID1 recorded on the track R in accordance with the leading position of the recording area of the main data is recorded on the sub data recording area of each track R in the leading specific area as third identification data ID3, respectively, and the fact that the arrival of the recording area that is a retrieval purpose arrives at the leading specific area is detected from the change of the second identification data ID2 in a fast retrieval operation, and the first identification data ID1 representing the leading position of the recording area to be retrieved is detected from the third identification data ID3 reproduced at that time.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a digital audio tape recorder (Digital Audio T
The present invention relates to a magnetic tape recording/reproducing device such as an ape recorder (hereinafter abbreviated as DAT).

0002

2. Description of the Related Art In a recording operation using a DAT, as described above, in addition to the main data, such as an audio digital signal, sub data, that is, sub code information, which is used as an index during a search, is recorded.

[0003] The subcode information in this case is the beginning of the magnetic tape.
ker (hereinafter abbreviated as BOT)), song time information that indicates the playback time of each song when the main data is music data,
These include start identification information that indicates the beginning position of a song, and song number information that indicates the serial number assigned to each song.

[0004] For example, when searching for a song number, by searching for the above-mentioned subcode information, a faster search is possible than with an analog recording type tape recorder.

[0005] Furthermore, since the above subcode information is recorded on the magnetic tape in a subcode recording area prepared separately from the main data recording area in which main data such as music data is recorded, the subcode information After-recording (hereinafter abbreviated as dubbing) in which only the recorded information is rewritten later is also possible.

FIG. 7 shows that a conventional DAT is used to search for the beginning position of an arbitrary song number, for example, song number 5, from among a plurality of pieces of music data that are main data recorded on a magnetic tape T. FIG. 6 is a diagram schematically showing a trajectory of a search operation when the song number information is corrected by dubbing. Among them, FIG. 7(1) shows the arrangement order of music data, which is the main data, on the magnetic tape T, and FIG. 7(2) shows the start identification information ST for indicating the boundary of the recording area of each music data, that is, each song. -ID format, Figure 7 (3) shows the recording position of the beginning of the music data of track number 5 on the magnetic tape T from the BOT side to the end of the tape (End of Tape).
The trajectory of the movement when searching toward the marker (hereinafter abbreviated as EOT) side is shown.

[0007] The start identification information ST-ID is 1-bit data, and is "1" in the section from the beginning position of the recording area of each song to the recording area of, for example, 9 seconds when converted using the above-mentioned absolute time information. , and is set to "0" in other areas. Therefore, during a search, the point in time when this start identification information ST-ID switches from "0" to "1" serves as an index for searching for the beginning position of each song.

Next, the above search operation will be explained with reference to FIG. First, E from the BOT side at a speed several hundred times faster than playback.
A search is performed toward the OT side as indicated by the symbol ■, and each time the start identification information ST-ID becomes "1", the song number information at that time is confirmed. When the target song number 5 is detected, the high-speed search operation shifts to a stop operation, and after traveling to a certain amount of inertia as indicated by the symbol ■, the position a where the start identification information ST-ID has been switched is detected. In order to
It returns in the opposite direction as shown by the symbol ■ at several times the speed of playback.

[0009] Even after the start identification information ST-ID switches from "1" to "0", it returns by a certain amount, and then moves forward at the normal playback speed, that is, from the BOT side to the EOT side, as shown by the symbol ■. Run to. During this run, absolute time information Ta is stored when the vehicle passes a position a where the start identification information ST-ID switches from "0" to "1". Thereafter, the vehicle travels a certain amount in the opposite direction again as indicated by the symbol ■, and then travels in the forward direction as indicated by the symbol ■ under the regeneration operation. During this run, the absolute time information is reproduced, and the reproduced absolute time information is the previously stored absolute time information T.
a, that is, the beginning position a of the recording area of song number 5
From the point when the start identification information ST-ID
In the period when is "1", that is, the period indicated by the symbol ■,
The song number information is dubbing from the previous song number 5 to song number 4. Thereafter, the starting position of the next song to be dubbed is searched in the same manner.

[0010] Here, the search operation is shown when correcting discontinuous song numbers by dubbing, but it can also be used in the same way when simply searching for the beginning of a song to be played or when deleting a song number. will be carried out.

[0011]

[Problem to be solved by the invention] The above-mentioned conventional DAT
Now, after confirming that the start identification information ST-ID has been switched in the high-speed search operation, return to the position before the switch and pass through that position again to detect the absolute time information that corresponds to the target head position. , it is necessary to go back to the original position and then use the detected absolute time information as a guide to search for the target start position in the next playback operation, which is a wasteful search and takes a lot of time. There was a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic tape recording/reproducing apparatus that can perform searches in a short time without wasting any search operations.

[0013]

[Means for Solving the Problems] The present invention records main data in the main data recording area of each track on a magnetic tape,
In a magnetic tape recording/playback device in which identification data is recorded in the sub-data recording area of each track as an index when searching for recorded main data, when playing back the sub-data recording area of each track is used. a first identification data recording means for recording first identification data indicating an absolute time; and a first identification data recording means for recording first identification data indicating an absolute time of a second identification data recording means for recording second identification data indicating that the tracks are in the first specific area in the sub data recording area of each track included in the first specific area; The first identification data recorded in the sub data recording area of the track corresponding to the head position of the recording area where data is recorded is transferred to the third identification data in the sub data recording area of each track included in the head specific area. a third identification data recording means for recording as data; and a third identification data recording means for recording as data;
The head specific area is searched by a high-speed search operation using the identification data as an index, and the head position of the recording area of the main data to be searched is determined based on the third identification data recorded in the track of this head specific area at a playback speed. This is a magnetic tape recording/reproducing apparatus characterized by comprising a search means for searching by.

[0014]

[Operation] According to the present invention, it is known from the change in the second identification data that the beginning specific area of the recording area to be searched in the high-speed search operation is reached, and from the third identification data read at this time. Since the first identification data indicating the beginning position of the recording area to be searched can be known,
With the searched first identification data as a target, the head position of the recording area to be directly searched in the next playback operation can be easily approached, and the search operation can be performed in a short time without waste.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the basic configuration of a rotary head type DAT which is an embodiment of the present invention.

The mechanism section 1 is composed of a capstan (not shown) for running the magnetic tape T, a rotary head 2 for scanning across the magnetic tape T in a direction inclined at a certain angle with respect to the running direction of the magnetic tape T, and the like. has been done. The rotary head 2 is constructed by disposing a writing magnetic head and a reading magnetic head on the circumferential surface of a rotary drum that is driven to rotate while in contact with the magnetic tape T.

The reproduction amplifier 3 is a circuit that amplifies the digital signal read from the magnetic tape T by the reading magnetic head of the rotary head 2 and supplies it to the modulation/demodulation circuit 5. The recording amplifier 4 is a circuit for amplifying the digital signal sent from the modulation/demodulation circuit 5 and applying it to the write magnetic head of the rotary head 2.

The modulation/demodulation circuit 5 modulates the digital signal sent from the signal processing circuit 6 into a signal suitable for recording on the magnetic tape T and supplies it to the recording amplifier 4, and also modulates the digital signal sent from the reproduction amplifier 3. This circuit demodulates the reproduced digital signal into a pre-recording signal and sends it to the signal processing circuit 6.

The signal processing circuit 6 performs processing such as interleaving and adding an error correction code to the digital signal sent from the analog-to-digital converter (hereinafter referred to as A/D converter) 7. At the same time, the reproduced digital signal sent from the modulation/demodulation circuit 5 is subjected to reverse interleaving processing and error correction processing to the next stage digital-to-analog converter (hereinafter referred to as a D/A converter). (abbreviated)) 9. This signal processing circuit 6 also includes a memory 6a that temporarily stores input data.

The A/D converter 7 is a circuit for converting, for example, an audio analog signal input from the input terminal 8 into a digital signal and inputting it to the signal processing circuit 6. The converter 9 is a circuit for converting, for example, a reproduced audio digital signal sent from the signal processing circuit 6 into an analog signal and sending it to the output terminal 10.

[0021] The servo control circuit 11 includes the mechanism section 1
The system control section 12 is a circuit for controlling the rotation speed of the rotary head 2 and the running speed of the magnetic tape T, and the system control section 12 is a circuit having a function of controlling the operation of the mechanism section 1 and the servo control circuit 11.

The subcode generation circuit 13 is a circuit that has a function of providing subcode information such as song number information to the control circuit 14 in addition to main data such as audio signals.

The control circuit 14 is a circuit that controls the entire DAT, and is composed of, for example, a microcomputer. This control circuit 14 generates second identification data ID2 and third identification data ID3, which will be described later, based on the first identification data ID1 given from the signal processing circuit 6, and converts these subcode data into the signal. It has a function to provide to the processing circuit 6.

The input/output terminal 15 is a terminal for inputting recording/reproducing commands as digital signals to the signal processing circuit 6 and for taking out subcode information reproduced by the signal processing circuit 6.

FIG. 2 is a diagram schematically showing the arrangement of data recorded on the track R on the magnetic tape T by the above-mentioned DAT. That is, one track R formed by scanning with a rotary head 2 that traverses the magnetic tape T at a constant angle inclination as shown by an arrow H with respect to the tape running direction P contains main data such as the above-mentioned audio digital signal. Apart from the main data recording area 16 that records
An ATF recording area 17 for recording an auto-tracking signal and a sub-code recording area 18 for recording identification data ID1, ID2, ID3, etc. for providing a search index are set at both the upper and lower ends of the track R.

FIG. 3 shows that the magnetic tape T is
FIG. 3 is a diagram schematically showing a recording area of an audio digital signal recorded on the top and each subcode information. Among them, FIG. 3(1) shows the arrangement order of the audio digital signals, which are the main data on the magnetic tape T, for each song, and FIG. 3(2) shows the first identification data ID1, which is absolute time information. (3) is a second index that indicates the beginning specific area from the beginning position of the recording area of each song to a certain number of tracks.
Figure 3 (4) shows the third identification data ID3 commonly written to each track R in the head specific area, and Figure 3 (5) shows the song number information ID4 assigned to each song. It shows.

The first identification data ID1, which is the absolute time information, is incremented every two tracks constituting one frame and recorded as a serial number. Further, the section of the head specific area is set to a period of approximately 9 seconds in terms of the first identification data ID1. This period is set as a period during which at least one track in this section can be scanned even when the reading magnetic head of the rotary head 2 scans the tracks R intermittently during a high-speed search operation.

As the third identification data ID3, the first identification data ID1 recorded in the first track R of the first specific area where this identification data is commonly recorded, that is, the absolute time information corresponding to the first track R, is used. used. That is, for example, if the absolute time information at position a of the first track in the area where the song number N is recorded is Ta, each track in the first specific area of the song has the third identification data ID.
Ta is commonly recorded as 3. The song number information ID4 is recorded only on each track in the head specific area.

FIG. 4 shows that the magnetic tape T is
FIG. 4 is a diagram schematically showing a trajectory of operations when searching for the beginning position of a desired song from the search engine and rewriting its song number information. Among them, FIG. 4(1) shows the classification of the recording area of each song on the magnetic tape T, and FIG. 4(2) shows the second identification data ID2 for identifying the leading specific area of the recording area of each song. , Figure 4 (
3) shows the trajectory of the operation when searching for the beginning position of the recording area of a song from the BOT side to the EOT side.

Next, an overview of the recording and reproducing operations of the DAT will be explained.

For example, an audio analog signal input from the recording operation input terminal 8 is converted into a digital signal by the A/D converter 7. The audio signal converted into a digital signal is subjected to processing such as interleaving processing and addition of an error correction code by the signal processing circuit 6. At the same time, first identification data ID1, which is absolute time information, and other identification data ID2, ID3 are given to the control circuit 14, and the subcode generation circuit 13 sends music number information ID4 to the control circuit 14.
Subcode information such as is given. In response to this, the control circuit 14 sends the identification data ID1,
Subcode information such as ID2, ID3 and song number information ID4 is given.

The signal processing circuit 6 rearranges the audio signal as the main data, the identification data ID1, ID2, ID3 and the track number information ID4 sent from the control circuit 14 according to the format for one track shown in FIG. The signal is sent to the modulation/demodulation circuit 5.

The signals modulated by the modulation/demodulation circuit 5 are synchronized with the operation of the servo control circuit 11, and are successively and sequentially recorded on the magnetic tape T by the rotary head 2 via the recording amplifier 4 as shown in FIG. .

Reproduction Operation At the time of reproduction, an operation opposite to the above-mentioned recording operation is performed. That is, data read from the magnetic tape T by the rotary head 2 is sent to the modulation/demodulation circuit 5 via the reproduction amplifier 3, where it is demodulated and sent to the signal processing circuit 6 at the next stage.

The signal sent to the signal processing circuit 6 is subjected to reverse interleaving processing here, and only the audio signal is converted to an analog signal by the D/A converter 9, and outputted from the output terminal 10, where only the audio signal is converted. will be played. Identification data ID1, I read from subcode recording area 18
D2, ID3, and song number information ID4 are used as indicators during a search operation to locate the beginning of a song, or as an indicator for displaying a song number in a DAT having a display function.

FIG. 5 is a flowchart showing the search operation using the DAT. The search operation using the DAT will be described with reference to this flowchart and FIG. 4.

Following the start step s1, a high-speed search operation in the EOT direction is performed in the next step s2, as shown by the symbol ■ in FIG. 4, and in the next step s3, a second
It is confirmed whether the first specific area whose identification data ID2 is "1" has been reached.

When it is confirmed in step s3 that this is the start specific area, it is confirmed in the next step s4 whether the song number information ID4 in this start specific area is the target song number "5". The operations of steps s2 to s4 are repeated until the target song number "5" is detected.
” is detected, in the next step s5, the third identification data ID3=Ta of the head specific area at this time is read and temporarily stored in the memory 6a of the signal processing circuit 6. In this case, the identification data ID3=Ta is equal to the first identification data ID1, that is, the absolute time information recorded on the track at the head position of the recording area of the song number "5".

Next, in step s6, the search and stop operation is performed, but due to inertia, the vehicle continues to travel toward the EOT to a certain extent and then stops, as shown by the symbol ■ in FIG. 4. In the next step s7, as shown by the symbol ■ in FIG.
After the magnetic tape T is rewound to the OT side, in the next step s8, at the playback speed, the tape is approached from the BOT side toward the beginning position of the recording area of the target song, as shown by the symbol ■ in FIG. It will be planned.

During this approach operation, in step s9, it is determined whether the first identification data ID1 to be read has reached the third identification data ID3=Ta that was previously searched in the high-speed search operation and stored in the memory 6a. Confirmation is constantly performed, and when it is confirmed that Ta has been reached, that is, the song number "5" is reached.
”, the next step s1 is reached.
0, rewriting of the song number information ID4, which is the original purpose of the search in this case, is performed over the section of the head specific area as shown by the symbol ■ in FIG. That is, in this case, since the song number information ID4 has shifted discontinuously from song number 3 to song number 5, the song number 5 has been changed by the dubbing by the above search.
is rewritten to song number 4.

Thereafter, in step s11, it is checked whether there is a song to be searched for next, and if there is a song to be searched for, the process returns to step s2 and the same process is repeated. Here, it is necessary to rewrite the song number information after song number 6, so
The above operation is repeated.

[0042] If it is determined in step s11 that there is no song to be searched, the process moves to step s12, where the entire search operation ends.

Furthermore, with this DAT, it is also possible to read the song numbers and start times of all songs recorded on the magnetic tape T by one high-speed search operation.

FIG. 6 is a diagram for explaining the search operation. Among them, FIG. 6(1) shows the recording area of each song on the magnetic tape T, FIG. 6(2) shows the second identification data ID2 which is the start identification information, and FIG. 6(3) shows the third identification data. As ID3, the start time of the song recorded in each track R of the first specific area of the recording area of each song, that is, the absolute time information of the first track R is shown.

As is clear from FIG. 6, the track R in the starting specific area of each song has absolute time information Ta, Tb, . . . corresponding to the starting track R as common third identification data.
is recorded, and track number information ID4 is also recorded in track R in the same starting specific area, so the track number and start time of each song can be sequentially read out as a set by high-speed search operation. This information is stored in memory 6.
By temporarily storing it in a, it can be used as cue information during playback.

[0046] Incidentally, in conventional DAT, such information is stored in a TOC (T
It used to be recorded in an area called ``Able Of Contents'', but this allows you to add and record new songs,
As described above, when a song number is changed, a new song number is added, or a song number is deleted during dubbing, it is necessary to rewrite the recorded information in the TOC each time. On the other hand, in this example, D
With AT, there is no need to rewrite such recorded information.

[0047]

As described above, according to the magnetic tape recording/reproducing apparatus of the present invention, it is possible to detect when the beginning specific area of the recording area to be searched is reached in a high-speed search operation.
Since the first identification data indicating the start position of the recording area to be searched is detected based on the change in the second identification data and the third identification data read at this time, the detected first identification data It is possible to easily approach the head position of the recording area to be searched directly in the next playback operation with the identification data as the target, and the search operation can be performed in a short time without waste.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a DAT that is an embodiment of the present invention.

FIG. 2 is a diagram schematically showing the arrangement of data recorded on a magnetic tape by the DAT of the embodiment.

FIG. 3 is a diagram showing the correspondence between main data and each subcode data recorded on a magnetic tape by the DAT of the embodiment.

FIG. 4 is a diagram schematically showing a trajectory of a search operation by the DAT of the embodiment.

FIG. 5 is a flowchart showing a search operation by the DAT of the embodiment.

FIG. 6 is a diagram schematically showing the correspondence between main data recorded on a magnetic tape by the DAT of the embodiment, and song number information and song start time information.

FIG. 7 is a diagram schematically showing a trajectory of a search operation using a conventional DAT.

[Explanation of symbols] 1 Mechanism section 2 Rotating head 3 Playback amplifier 4 Recording amplifier 5 Modulation/demodulation circuit 6 Signal processing circuit 6a Memory 7 A/D converter 9 D/A converter 11 Servo control circuit 12 System control section 13 Subcode generation circuit 14 Control circuit 16 Main data recording area 18 Subcode recording area

Claims (1)

[Claims] Claim 1: Main data is recorded in the main data recording area of each track on the magnetic tape, and identification data is recorded in the sub data recording area of each track, which serves as an index when searching for the recorded main data. In the magnetic tape recording/reproducing apparatus, a first identification data recording means records first identification data indicating an absolute time at the time of reproduction in a sub data recording area of each track, and a series of main data is recorded. In the recording area consisting of a plurality of consecutive tracks to be recorded, the sub data recording area of each track included in the start specific area from the start position to a certain area, those tracks are located within the start specific area. a second identification data recording means for recording second identification data indicating the series of main data; and a first identification recorded in a sub-data recording area of a track corresponding to the head position of the recording area in which the series of main data is recorded. third identification data recording means for recording data as third identification data in a sub-data recording area of each track included in the head specific area; A search means for searching a start specific area and searching at a playback speed for the start position of the recording area of the main data to be searched based on the third identification data recorded in the track of the start specific area. Characteristic magnetic tape recording/playback device.