JPH08106768A - Method and apparatus for reproducing magnetic tape - Google Patents

Abstract

PURPOSE: To provide an apparatus for reproducing a magnetic tape which enables execution of efficient and high-speed search for desired data from the magnetic tape having two running directions. CONSTITUTION: A magnetic tape is driven by a mechanism drive part 2 and main data and auxiliary data recorded on the magnetic tape are read by a main data demodulating part 4 and an auxiliary data demodulating part 5 respectively. Either a forward-side final program number or a backward-side program number obtained from contents information contained in the read auxiliary data is stored in a RAM 15. Receiving an instruction to perform high-speed search from an operating part 8, a microcomputer 7 generates a program number specifying a program to be a target and compares it with the forward-side final program number or the backward-side program number stored in the RAM 15. Thereby determination is made as to which of forward and backward recording areas is to be searched at a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape reproducing method and a magnetic tape reproducing apparatus for performing a high-speed search for a predetermined program from a magnetic tape having recording areas in two kinds of traveling directions of forward and backward paths.

[0002]

2. Description of the Related Art A conventional analog magnetic tape reproducing apparatus has a function of locating a desired piece of music when reproducing music or the like. As a method of realizing such a program (track) cueing function, for example, a method of running a tape at high speed to detect a non-recorded portion on a magnetic tape has been adopted. Further, in recent years, a digital audio tape recorder (DAT: Digital Audio Tape Recorde) capable of recording / reproducing with high sound quality by digital recording.
r) and other magnetic tape playback devices are becoming popular. In this type of digital recording, main recording information such as music, position information indicating the recording position of the music on the magnetic tape, music number information indicating the recording order, and the like can be recorded as auxiliary data. Therefore, even if the inter-track portion is not detected, by using such auxiliary data, for example, by running the magnetic tape at high speed while reproducing the label information indicating the beginning position of each program, the desired song can be played in a short time. Can be selected.

Incidentally, the current DAT has a fixed head type SD that allows tape running in two directions of the forward and backward paths, in addition to the rotary head type R-DAT that can only perform one-way recording.
There is AT (Stationary Head DAT). This S-DAT
The recording area of the magnetic tape is divided into upper and lower parts, and the upper and lower sides are used as the forward path and the backward path, and the fixed head enables recording / playback in any tape running in the reciprocating direction. It has the feature that it enables music playback. However, when the desired program is recorded in the recording area on the side where the program is not reproduced, the following problems occur. That is, in the conventional magnetic tape reproducing apparatus, the high-speed search is performed by counting the number of labels up to the target program on the basis of the position of the tape currently being reproduced. The high-speed search of the recording area on the other side cannot be performed without performing the high-speed search up to the start end or the end and reversing the tape running direction. For this reason, the time required for locating the desired program becomes longer on average as compared with the one-side recording.

In order to solve such an inconvenience, for example, in a magnetic tape device disclosed in Japanese Patent Laid-Open No. 6-12840, when a program is reproduced from a recording area on one side, the magnetic tape on both sides is reproduced. A method of reading the auxiliary data recorded in the recording area is adopted.

The above-mentioned magnetic tape device is configured to hold all absolute program numbers obtained from the two auxiliary data recording areas in the forward and backward paths and the absolute time indicating the start position of each program in a predetermined memory. . Then, by comparing the absolute program number at the current traveling position, the absolute time, and the information stored in the memory, which are obtained from the read auxiliary data, with the desired target program number, the target program is determined to be the forward or backward path. It is determined whether or not it exists in the recording area, and this enables high-speed search in the shortest time.

[0006]

As described above, in the conventional magnetic tape apparatus such as S-DAT capable of recording / reproducing in the reciprocating direction, in order to quickly search recorded main data at high speed, It is necessary to read the auxiliary recording data recorded in the recording area from the other recording area while reproducing the recording area. Therefore, the auxiliary data recorded in the recording area on the side opposite to the main data being reproduced must be read while scanning in the reverse direction, and the mechanism of the read head and the circuit of the data demodulation unit of the magnetic tape device must be read. There was a problem that the configuration etc. became complicated.

Of the read auxiliary data,
For example, there is a problem that a large memory capacity is required to store all the program numbers and the absolute time indicating the start position of each program in the magnetic tape device.

The present invention has been made to solve the above-mentioned problems, and a first object thereof is to quickly and quickly search desired data from a magnetic tape having two running directions with a small memory capacity. It is an object of the present invention to provide a magnetic tape reproducing device capable of performing the operation.

A second object of the present invention is to move by the shortest distance on the magnetic tape even when a search for a program recorded in a recording area different from the recording area currently being reproduced is instructed. Another object of the present invention is to provide a magnetic tape reproducing method which enables reproduction of a desired program and shortens the time required for high-speed search.

[0010]

The method according to claim 1 comprises:
In a magnetic tape reproducing method for searching a magnetic tape in which a plurality of programs are digitally recorded in a recording area to be recorded and reproduced by scanning in two directions and searching a desired program at high speed, auxiliary data is reproduced from the magnetic tape. A first step of storing at least one of the program number of the final program recorded in the recording area on the forward path and the program number of the first program recorded in the recording area on the return path; The target program number and the stored program number are compared, the target program is the forward path,
Alternatively, in the second step of determining which recording area on the return path side exists, and in the second step, when it is determined that the target program exists in a recording area different from the auxiliary data, the magnetic tape And a third step of performing a high speed search by reversing the traveling direction.

A method according to claim 2 is the magnetic tape reproducing method according to claim 1, wherein in the first step,
From the table of contents information contained in the auxiliary data, while detecting a code indicating the recording end position of the recording area on the outward path,
The final program number on the outward path side is determined from the table of contents information detected immediately before that.

A method according to claim 3 is the magnetic tape reproducing method according to claim 1, wherein in the first step,
From the table of contents information contained in the auxiliary data, while detecting a code indicating the recording end position of the recording area on the outward path,
The first program number on the return path side is determined from the table of contents information detected immediately after that.

A method according to claim 4 is the magnetic tape reproducing method according to claim 1, wherein in the first step,
Of the table of contents information included in the auxiliary data, the time information indicating the absolute time at the recording start position of each program on the magnetic tape and the time information indicating the absolute time at the recording end position on the outward path are detected, and The final program number on the forward path side is determined from the index information indicating the maximum absolute time in the index information smaller than the absolute time at the recording end position on the forward path side.

A method according to a fifth aspect is the magnetic tape reproducing method according to the first aspect, wherein in the first step,
Of the table of contents information contained in the auxiliary data, the time information indicating the absolute time at the head position of each program on the magnetic tape and the time information indicating the absolute time at the recording end position on the outward path are detected, and both are detected. The comparison is characterized in that the leading program number on the return path side is determined from the index information indicating the minimum absolute time in the index information that is larger than the absolute time at the recording end position on the forward path side.

A method according to claim 6 is the magnetic tape reproducing method according to claim 1, wherein in the first step,
Among the table-of-contents information included in the auxiliary data, the bit information for identifying the recording area of each program recorded on the forward path or the backward path of the magnetic tape is detected, and among the table-of-contents information classified on the forward path side by the bit information. The final program number on the forward path side is determined from the table of contents information indicating the maximum absolute time of.

A method according to claim 7 is the magnetic tape reproducing method according to claim 1, wherein in the first step,
Among the table-of-contents information included in the auxiliary data, the bit information for identifying the recording area of each program recorded on the forward path or the backward path of the magnetic tape is detected, and among the table-of-contents information divided on the backward path side by the bit information. The leading program number on the return path side is determined from the table of contents information indicating the minimum absolute time of.

The apparatus according to claim 8 searches a magnetic tape in which a plurality of programs are digitally recorded in a recording area which is recorded and reproduced by scanning in two directions, and a magnetic tape reproducing apparatus which searches for a desired program at high speed. At
Driving means for reciprocating the magnetic tape, auxiliary data demodulating means for demodulating auxiliary data including at least absolute program number and table of contents information digitally recorded on the magnetic tape, and a final program on the forward path side of the demodulated table of contents information. Number or at least one of the first program number on the return path side, the drive means is controlled and designated based on the auxiliary data read by the auxiliary data demodulation means and the program number stored in the storage means. And a high-speed search means for searching the start position of the stored program.

According to a ninth aspect of the present invention, in the magnetic tape reproducing apparatus according to the eighth aspect, the high speed search means is
It is characterized in that the search is not started until at least one of the forward-path side final program number and the backward-path side leading program number is stored in the storage means.

According to a tenth aspect of the present invention, in the magnetic tape reproducing apparatus according to the eighth aspect or the ninth aspect, the storage means has an area for storing a forward side final program number and a backward side head program number respectively. It is characterized by having.

[0020]

In the magnetic tape reproducing method according to the first aspect of the present invention, for example, either the forward side final program number or the backward path side program number is stored from the table of contents information contained in the auxiliary data. Therefore, when a high-speed search instruction is received, by comparing the program number indicating the target program by the microcomputer with the stored forward-side final program number or return-side program number, which recording area of the forward-going return path is recorded. You can decide whether to search fast.

In the reproducing method according to the second aspect, the final program number on the outward path can be easily determined by detecting the code indicating the recording end position of the recording area on the outward path from the table of contents information included in the auxiliary data. You can

In the reproducing method according to the third aspect, the backward program head program number can be easily determined by detecting the code indicating the recording end position of the recording area on the outward path from the table of contents information included in the auxiliary data. You can

In the reproducing method according to the fourth aspect, from the table of contents information included in the auxiliary data, time information indicating the absolute time at the recording start position of each program and time information indicating the absolute time at the recording end position on the outward path. Is detected, it is possible to easily determine the final program number on the forward path side even with a magnetic tape in which the table of contents information is not recorded in order.

In the reproducing method according to the fifth aspect, from the table of contents information included in the auxiliary data, time information indicating the absolute time at the recording start position of each program and time information indicating the absolute time at the recording end position on the forward path side. Therefore, even if the magnetic tape does not have the table-of-contents information recorded in order, it is possible to easily determine the backward program head program number.

In the reproducing method according to the sixth aspect, since the bit information for identifying the recording area of each program is detected from the table of contents information included in the auxiliary data, the time indicating the absolute time at the recording end position on the forward path side is detected. Even with a magnetic tape on which no information is recorded, the forward path final program number can be easily determined.

In the reproducing method according to the seventh aspect, since the bit information for identifying the recording area of each program is detected from the table of contents information included in the auxiliary data, the time indicating the absolute time at the recording end position on the forward path side is detected. Even on a magnetic tape on which no information is recorded, it is possible to easily determine the homeward side leading program number.

In the apparatus according to the eighth aspect, when searching a magnetic tape in which a plurality of programs are digitally recorded in a recording area which is recorded and reproduced by scanning in two directions, the final information on the forward side of the demodulated index information is searched. Only by storing at least one of the program number and the first program number on the return path side, a desired program can be searched at high speed.

In the apparatus according to the ninth aspect, the search is not started until at least one of the last program number on the outward path and the first program number on the backward path is stored in the storage means, and the time for searching for the program is shortened. I am trying to do it.

In the apparatus according to the tenth aspect, by separately allocating the storage areas for the final program number on the outward path and the leading program number on the returning side, at least the outgoing side final program number and the returning side leading program number are stored. If one is stored, a high-speed search can be started immediately and the search time can be shortened.

[0030]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Example 1.

FIG. 1 is a block diagram showing the configuration of the magnetic tape reproducing apparatus of the present invention. In FIG. 1, 1 is a cassette containing a magnetic tape, 2 is a mechanism drive unit for controlling the running of the magnetic tape, 3 is a reproducing head for reproducing main data and auxiliary data recorded on the magnetic tape, 4 Is a main data demodulation unit for demodulating the main data reproduced by the reproducing head 3 and performing error correction, and 5 is a reproducing head 3
The auxiliary data demodulation section 6 demodulates the auxiliary data reproduced by the above and performs error correction, and the numeral 6 is a label detection section for detecting the recorded label by envelope-modulating the auxiliary data. A microcomputer 7 is connected to the auxiliary data demodulation unit 5 and the label detection unit 6, receives auxiliary data, label data and the like, and instructs the mechanism drive unit 2 to run the magnetic tape.
It controls the entire system.

Reference numeral 8 denotes a display / operation unit. As will be described later, the user inputs a target program number to be searched or the like to the microcomputer 7 via the display / operation unit 8 or displays an operating state. Can be seen.
Reference numeral 9 denotes a D / A converter that converts the main data demodulated in the main data demodulation unit 4 into an audio signal, and 10 denotes a preamplifier that adjusts the volume or the sound quality of the audio signal obtained by the D / A converter 9. Is a power amplifier that drives the speaker 12 and the like according to the audio signal from the preamplifier 10.

The microcomputer 7 is a CPU 1
3, a ROM 14, a RAM 15, input / output devices 16 and 17, and a memory area for storing a part of the table-of-contents information read from the auxiliary data demodulated by the auxiliary data demodulation unit 5 is secured in the RAM 15. .

FIG. 2 is a perspective view showing the external structure of the magnetic tape reproducing apparatus including the display / operation section 8. A cassette insertion opening 19 for mounting the cassette 1 containing the magnetic tape is formed in the upper left portion of the front panel of the device housing 18, and a message for notifying the operating state of the cassette 1 is further provided in the upper right portion. A display unit 20 is provided for displaying a target program number for high speed search. Two
Reference numerals 1 to 28 are various operation switches for the magnetic tape, 21 is an eject switch for taking out the inserted cassette 1, 22 is a play switch for instructing to start reproduction of the magnetic tape, and 23 is rewinding of the magnetic tape. A rewinding switch for instructing, 24 is a fast-forwarding switch for instructing fast-forwarding of the magnetic tape, and 25 and 26 are music selection DOWN switches and music selection UP switches for instructing high-speed search of the magnetic tape. Further, 27 and 28 are an UP switch and a DOWN switch for adjusting volume and sound quality.

FIG. 3 shows a track pattern recorded on the magnetic tape. This magnetic tape 30
Two recording areas 3 vertically divided by a center line C
1, 32, of which the recording area 31 is formed with forward tracks including 9 tracks T1 to T9, and the recording area 32 is provided with backward tracks including 9 tracks T10 to T18. Has been formed. These recording areas 3
Main information such as audio data is recorded as main data on 8 of the 9 tracks of 1 and 32, and the remaining one track, for example, outermost tracks T1 and T18. Auxiliary data for supplementing main data such as control data for high-speed search is recorded in.

When the magnetic tape 30 is run in the forward direction of the drawing, the main data and auxiliary data recorded in the tracks T1 to T9 are reproduced at the same time, and conversely, the magnetic tape 30 is run in the backward direction of the drawing, thereby T10
The main data and auxiliary data recorded at T18 are reproduced at the same time.

FIG. 4 is a diagram showing an example of a recording format of auxiliary data recorded on the track T1 (outward path side) and the track T18 (return path side). This recording format uses 15 bytes from byte 0 to byte 14 as one repeating unit. Further, auxiliary data necessary for controlling all the main data is recorded on the tracks T1 and T18 of the magnetic tape 30. And this auxiliary data is repeatedly recorded on the tape position corresponding to the entire range where the main data is recorded, for example, in a commercially available music tape, and in many cases, it is a normal recording tape (blank tape). Then, the auxiliary data group corresponding to the main data is recorded only once at the recording start position in each of the forward and backward passes. However, as will be described later, not all of these auxiliary data are recorded in such a recording format on all magnetic tapes.

In FIG. 4, the absolute program number (APGM) recorded in byte 0 corresponds to, for example, the music number when music is recorded as the main data, and is recorded as the main data by this APGM. Up to 99
The programs (01 to 99) can be identified. The absolute time data recorded in the following bytes 1 to 3 is time information indicating the time required to reproduce the program recorded as the main data from the recording start position (start position) of the tape to that position. is there. This absolute time data is displayed by second digit data (byte 3), minute digit data (byte 2), hour digit data (lower 4 bits of byte 1) and frame number data (bits 4 to 6 of byte 1), The tape position of the recorded program can be identified. The flag data S of the most significant bit of the byte 1 is bit information for distinguishing the forward and backward paths. For example, when the program is recorded on the forward path, S = 0, and it is recorded on the backward track. , S = 1.

In the recording format of FIG. 4, the program elapsed time data recorded in bytes 4 to 6 is time information indicating the elapsed time from the recording start time of the program (music piece) currently being reproduced. . This time information is also
Similar to absolute time data, second digit data (byte 6), minute digit data (byte 5), hour digit data (lower 4 of byte 4)
Bit) and frame number data (bit 4 of byte 4)
6), the tape position in the program can be identified.

Further, of the recording formats shown in FIG.
TOC data 1 and TOC data 2 recorded in bytes 7 to 10 and bytes 11 to 14, respectively, are the table of contents information (Table Of C) about the main data recorded on the magnetic tape.
ontents), which contains information such as where each program is recorded on the magnetic tape. That is, the series of table-of-contents information is at least the TOC corresponding to the number of programs recorded as main data.
It is composed of data, and together with the absolute time data and program elapsed time data, two items of TOC data corresponding to two programs, for example, TOC data 1 and TO.
A track T for auxiliary data with C data 2 as one unit
1, recorded at T18.

FIG. 5 is a diagram showing an example of the recording format of TOC data. The TOC information for one item consists of 4-byte TOC data, and the TOCI recorded in byte 1
It is composed of a TEM and time information recorded in bytes 2 to 4. TOCITEM is a 1-byte BCD code that classifies the contents of TOC data.
The contents of the TOC data are identified by this code. There are four types of codes in this TOCITEM. The first type is code 0A meaning the start of the table of contents information, and the second type is code 0 indicating the program number corresponding to the absolute time data recorded in bytes 2-4.
The third type is a code AE that means absolute time data at the recording end position of the main data on the outward path, and the fourth type is the recording end position of the main data on the return path. It is a code BE that means absolute time data.

In the recording format shown in FIG. 5, if the TOCITEM of byte 1 is the code 09 of the second type, the contents of TOC data (bytes 2 to 4)
Indicates absolute time data at the recording start position of the ninth program. If TOCITEM is the third type of code AE, its content indicates absolute time data at the recording end position of the main data on the outward path side. In FIG. 5, the most significant bit of the byte 2 is the flag data S, which is bit information for discriminating in which of the forward and backward recording areas the target indicated by the TOC data is recorded.

Further, if TOCITEM is the first type code 0A, attribute data of the table of contents information recorded as auxiliary data, for example, the number of TOC data and the number of repetitions thereof are written in the subsequent bytes 2 to 4. Is recorded. For music tapes in which subcode groups are repeatedly recorded in the entire area of the magnetic tape, TOCI
The TEM code 0A functions as a delimiter code for reading a series of table of contents information. Usually, these table of contents information is code 0A, 01 ..., AE, XX ..., BE (XX
Are recorded in the order of the code corresponding to the leading program number on the return path side.

FIG. 6 is a diagram showing an example of TOC data. In this TOC data, TOCITEM is "09", flag data S is "1", and byte 2 is
The other data, bytes 3 and 4, indicate that the recording of the 9th program has started from the position of the second frame on the return path at the absolute time of 45 minutes and 36 seconds on this magnetic tape. Here, in the frame data, 5 frames from 0 to 4 correspond to 1 second.

FIG. 7 is an explanatory diagram showing an example of the tape running path at the time of program search. In the cassette 1, main data (tunes) of program numbers # 1 to # 6 are recorded in a forward recording area (Side A), and a backward recording area (B) is recorded.
Main data of the program numbers # 7 to # 12 (track)
Is recorded. Then, when the target program number # 9 is instructed and the high speed search switch is operated during the reproduction of the program number # 4, the conventional magnetic tape reproducing apparatus immediately performs the high speed search in the forward direction. Is started. That is, as indicated by the broken line in the figure, the tape reproduction position a is reached to the tape end position b, and then the tape running direction is reversed and the high speed search is continued, so that the head position c of the target program is changed to the forward direction. Detected from.

However, in the program search by the magnetic tape reproducing apparatus of the present invention, when the target program number # 9 is designated, as long as the forward side final program number # 6 or the backward side leading program number # 7 is known. , Compared to the target program number. As a result, it is found that the target program does not exist in the recording area on the outward path that is currently being reproduced, and the mechanism drive unit 2 is immediately instructed to reverse the tape running direction. Thereafter, in this example, the program of program number # 9 recorded on the B side is reproduced from the middle, and if the tape position is found from the absolute program number recorded as auxiliary data, a high speed search in the rewinding direction ( The program start position c of the target program number # 9 can be detected by the reverse search).

In FIG. 7, the tape running path described above is shown by a solid line. Generally, in many cases, the high-speed search indicated by the solid line is shorter than the time required for the high-speed search along the broken line in FIG. 7 as a route to reach the head position of the instructed target program. It is clear that the inventive fast search is performed in a short time.

FIG. 8 is an explanatory diagram showing the arrangement of auxiliary data recorded on the magnetic tape of FIG. In the magnetic tape portion shown in the figure, the upper half is the forward recording area, the program of program number # 4 is recorded as main data, and the magnetic head runs in the direction from left to right in the figure to Auxiliary data is read. Further, the lower half of the magnetic tape is a backward path recording area, and program numbers # 9 and # 10 are recorded as main data. Then, by running the magnetic head from right to left in the figure, these programs are sequentially read, and at the same time, the auxiliary data is read.

Further, in the case of the magnetic tape shown in FIG.
As described with reference to FIG. 4, the auxiliary data is repeatedly recorded in the format having the absolute program number as the first byte. Here, since the programs # 1 to # 12 are recorded as main data on the magnetic tape in the recording areas on the forward path side and the backward path side, respectively, as shown in FIG.
Code 0 corresponding to the program number as auxiliary data
A total of 15 items 1 to 12 and 0A, AE, and BE, that is, TOC information consisting of 15 TOC data (TOC1 to TOC15) is recorded, and absolute time data Ti and program elapsed time data tj, tk are recorded. ... is recorded.

FIG. 9 is a flow chart showing the procedure of high speed search in the magnetic tape reproducing apparatus in the first embodiment.

When the reproducing operation is instructed from the display / operation section 8, the microcomputer 7 instructs the mechanism driving section 2 to perform the reproducing mode, and the reproducing operation in step S1 is started.

In step S2, the microcomputer 7 determines the final program number (LP
It is determined whether the storage of GM) is completed.

Step S3 is a subroutine for storing the final program number (LPGM) on the outward path. This is executed by reading the table-of-contents information from the auxiliary data demodulated by the auxiliary data demodulation unit 5, and for example, the outward side final program number is determined by the procedure shown in Examples 3 to 5 described later, The program number is stored in the memory area secured in the RAM of the microcomputer 7.

If it is determined in step S4 that a high-speed search instruction has been input by operating the switch of the display / operation section 8, the process proceeds to step S5. If not, the process returns to step S2.

The microcomputer 7 determines again whether or not the forward path final program number is stored (step S5). This is because even if the subroutine is executed in step S3, the necessary forward index information cannot be read from the magnetic tape depending on the tape scanning position, and thus the forward path final program number may not be stored.

In step S6, when the storage of the final program number on the outward path has not been completed, the high speed search subroutine of the method shown by the broken line in FIG.

On the other hand, when the storage of the final program number on the outward path has been completed, the microcomputer 7 generates a target program number (hereinafter referred to as TPGM) indicating a target program and stores it in the memory area of the RAM. A comparison is made with the stored forward path final program number (step S7).

As a result of the comparison in step S7, TPG
When it is determined that M is larger, if the reproduction direction at that time is the outward path, the microcomputer 7 instructs the mechanism drive unit 2 to reverse the traveling direction and starts the reproduction on the return path side. However, if the reproduction direction at that time is the return path side, the reproduction on the return path side is continued as it is (step S
8).

Further, as a result of the comparison in step S7,
When it is determined that TPGM is smaller, if the reproduction direction at that time is the forward path, the microcomputer 7
Continues the reproduction in the traveling direction (outward route side) from the beginning to the mechanism drive unit 2, and instructs the mechanism drive unit 2 to reverse the traveling direction if the reproducing direction at that time is the return route side (step S).
9).

In step S10, the microcomputer 7 uses the auxiliary data demodulated by the auxiliary data demodulating section in steps S7 and S8 to determine the absolute program number (APGM) of the tape position currently being reproduced.
Read.

In step S11, the read absolute program number is compared with TPGM. When TPGM is larger than the absolute program number, a high speed search (forward search) is performed in the fast forward direction (step S12).

On the other hand, when TPGM is smaller than or equal to the absolute program number, a high speed search (reverse search) is performed in the rewinding direction (step S13).

As described above, in these high-speed searches, the final program number (LPGM) on the outward path side is compared with the target program number (TPGM), and LPGM ≧
If it is TPGM, the target program exists in the forward recording area. Therefore, if the reproduction position at the time of starting the reproduction operation is on the outward path side, the recording area on the outward path side is searched at high speed from there.

However, in the comparison with the target program number, if LPGM <TPGM, the target program exists in the homeward recording area. Therefore, if the reproducing position at the time of starting the reproducing operation is on the forward path side, the microcomputer 7 immediately instructs the mechanism drive section 2 to change the recording area to be reproduced, and searches the recording area on the backward path at high speed. If the reproduction position at the time of starting the reproduction operation is on the return path side, the microcomputer 7 instructs the mechanism drive unit 2 to continue reproduction in the traveling direction from the beginning.

In this way, when the forward side final program number is stored in the memory area secured in the RAM 15, the magnetic tape is used even when a program existing in a recording area different from the recording area currently being reproduced is searched at high speed. Since it is not necessary to run to the end or the start end of, the reproduction of the desired program can be started in a short time. Embodiment 2. FIG.

FIG. 10 is a flow chart showing another high speed search procedure in the magnetic tape reproducing apparatus in the first embodiment. When the reproduction operation is instructed by the display / operation unit 8, the microcomputer 7 instructs the mechanism drive unit 2 to perform the reproduction mode, and the reproduction operation of step S14 is started.

In step S15, the microcomputer 7 returns to the first program number (F
PGM) storage is completed.

Step S16 is a subroutine for storing the leading program number on the return path, which is executed when it is not completed. As a result, the table of contents information in the auxiliary data demodulated by the auxiliary data demodulating unit 5 is sequentially read to determine the backward program head program number, and the program number is stored in the RAM of the microcomputer 7 in the memory area. To store.

In step S17, the display / operation unit 8
If a high-speed search instruction is input by operating the switch, the process proceeds to step S18, otherwise,
It returns to step S15.

The microcomputer 7 determines again whether or not the homeward side leading program number is stored (step S18). Even if the subroutine is executed in step S16, there is a case where the homeward program number on the return path side cannot be stored.

In step S19, if the backward path leading program number has not been stored, the high speed search subroutine of the method shown by the broken line in FIG. 7 is performed by detecting the number of labels as in the conventional case.

On the other hand, when the storage of the first program number on the homeward side is completed, the microcomputer 7 generates a target program number (hereinafter, referred to as TPGM) indicating a target program and stores it in the memory area of the RAM. Stored return side top program number (FPG
And M) are compared (step S20).

As a result of the comparison in step S20, FP
When it is determined that TPGM is larger than or equal to GM, and the reproduction direction at that time is the outward path, the microcomputer 7 instructs the mechanism drive unit 2 to reverse the traveling direction, Start playback on the return path,
If the reproduction direction at that time point is the return path side, the reproduction on the return path side is continued as it is (step S21).

When it is determined that TPGM is smaller than FPGM as a result of the comparison in step S20, if the reproduction direction at that time is the forward path, the microcomputer 7 instructs the mechanism drive unit 2 to move. The reproduction in the traveling direction (outward path side) is continued from the beginning, and if the reproduction direction at that time is the returning path side, the reversal of the traveling direction is instructed (step S22).

In step S23, the microcomputer 7 uses the auxiliary data demodulated by the auxiliary data demodulation section in steps S21 and S22 to determine the absolute program number (APG) of the tape position currently being reproduced.
Read M).

In step S24, the read absolute program number and TPGM are compared. When TPGM is larger than the absolute program number, a high speed search (forward search) is performed in the fast forward direction (step S25).

On the contrary, when TPGM is smaller than or equal to the absolute program number, a high speed search (reverse search) is performed in the rewinding direction (step S26).

As described above, in these high speed searches, the start program number (FPGM) on the return path side and the target program number (TPGM) are compared, and FPGM>
If it is TPGM, the target program exists in the forward recording area. Therefore, if the reproduction position at the time of starting the reproduction operation is on the outward path side, the recording area on the outward path side is searched at high speed from there.

However, in the comparison with the target program number, if FPGM≤TPGM, the target program exists in the backward recording area. Therefore, if the reproducing position at the time of starting the reproducing operation is on the forward path side, the microcomputer 7 immediately instructs the mechanism drive section 2 to change the recording area to be reproduced, and searches the recording area on the backward path at high speed. If the reproduction position at the time of starting the reproduction operation is on the return path side, the microcomputer 7 instructs the mechanism drive unit 2 to continue reproduction in the traveling direction from the beginning.

In this way, when the backward program head program number is stored in the memory area secured in the RAM 15, the magnetic tape is used even when a program existing in a recording area different from the recording area currently being reproduced is searched at high speed. Since it is not necessary to run to the end or the start end of, the reproduction of the desired program can be started in a short time. Example 3.

Forward path L in the reproducing method of the first embodiment
Details of the PGM storage subroutine (step S3) or the return-side FPGM storage subroutine (step S16) in the reproducing method of the second embodiment will be described below.

As described above, the table-of-contents information about each program recorded as the main data is recorded in the auxiliary data recording area in order from the TOC data of the program of absolute program number # 01. Moreover, the TOC data following the TOC data for the final program (LPGM) on the outward path includes the absolute time data indicating the recording end position of the outward recording area, as well as the TOC data.
The code AE of CITEM is recorded, and the TOC data immediately after that is recorded with the first program (FPG) on the return path side.
The table of contents information about M) is recorded (see FIG. 8).

When detecting the absolute program number of the final program on the outward path, the microcomputer 7 uses the TO
Each time the C data is read, the TOCITEM is updated and stored in the memory area secured in the RAM 15, so that the T stored in the memory area when the code AE is detected.
The outgoing LPGM can be determined from OCITEM.

FIG. 11 is a flow chart showing an example of a subroutine (which constitutes step S3 in FIG. 9) for storing the LPGM on the outward path.

At sub-step SS1, the TOC data contained therein is read from the auxiliary data demodulated by the auxiliary data demodulating section 5 of the microcomputer 7.

In sub-step SS2, sub-step SS1
It is determined whether or not the TOCITEM of the TOC data read in step 1 is the code AE.

If it is determined in sub-step SS2 that the code is not code AE, the process proceeds to sub-step SS3, and it is further determined whether the code is code 01 to code 99 or another code.

In substep SS4, the read TO
TOCITEM of C data is code 01 to code 99
If so, the code number is stored in the memory area secured in the RAM 15, and the subroutine ends.

In sub-step SS5, when the code AE is detected in sub-step SS2, it is determined that the last program number (LPGM) on the outward path is stored in a predetermined memory area, and a flag indicating, for example, storage completion is set. After that, the determination result in step S2 is YES.

To detect the absolute program number of the first program on the return path side, the microcomputer 7
It is sufficient to sequentially read the table-of-contents information by, read the code number from the TOC data immediately after detecting the TOCITEM code AE, and store it in the memory area secured in the RAM 15 as the return path FPGM.

FIG. 12 is a flow chart showing an example of a subroutine (which constitutes step S16 of FIG. 10) for storing the FPGM on the return path side. Substep
At SS6, the TOC data contained therein is read from the auxiliary data demodulated by the auxiliary data demodulation unit 5 of the microcomputer 7.

In sub-step SS7, it is determined whether or not the code AE detected flag is set. If it is not set, proceed to sub-step SS8.

In sub-step SS8, sub-step SS6
It is determined whether or not the TOCITEM of the TOC data read in step 1 is the code AE.

TOCITE of the read TOC data
When M is not code AE, the process ends. Sub step SS
When the code AE is detected in 8, the code AE detected flag is set (substep SS9), and the subroutine is finished.

If it is determined in sub-step SS7 that the code AE detected flag is set,
Further, it is determined whether the code is code 01 to code 99 or another code (substep SS1).
0).

In sub-step SS11, the read T
TOCITEM of OC data is code 01 to code 9
If it is 9, the code number is stored in the memory area secured in the RAM 15 as the FPGM on the return path side. In sub-step SS12, the code AE detected flag is reset.

The sub-step SS13 sets, for example, a storage completion flag on the assumption that the first program number (FPGM) on the return path side is stored in a predetermined memory area. After this, the determination result in step S15 is YES.

FIG. 13 is a diagram showing the structure of a memory area secured in the RAM 15. In order to execute either of the two high-speed searches shown in the first or second embodiment, it is sufficient to store either the last program number on the forward path side or the first program number on the return path side. However, in the magnetic tape player, when the playback starts,
When the two subroutines described in the third embodiment are executed simultaneously, the memory A secured in the RAM 15
It is necessary to separately store the final program number on the outward path and the leading program number on the return path in each area of B. If the memory area is configured in this way, the high-speed search shown in FIG. 9 or 10 can be selected and executed when the storage of one of the program numbers is completed.

Example 4. A procedure for reading the TOC data including the AE code before and after the TOC data for determining the final program number on the outward path or the leading program number on the backward path in the third embodiment has been described. However, the TOC data forming the table of contents information in the auxiliary data recording area may be recorded in an order other than the order of the absolute program numbers. In such a case, of the read table of contents information, the TOC indicating the maximum absolute time from the absolute times smaller than that based on the time information indicating the absolute time at the final recording position on the outward path side.
Select the data and select the final program number (L
PGM). The memory configuration and the processing procedure therefor will be described below.

FIG. 14 is a diagram showing the structure of the memory necessary for determining the final program number on the outward path side.
In the fourth embodiment, three storage areas A, C and D are secured in the RAM 15 of the magnetic tape reproducing apparatus to store auxiliary data for high speed search in the microcomputer 7. That is, the RAM 15 has a memory area C for storing the content of the code AE of TOCITEM among the reproduced auxiliary data, and codes 01 to 9.
9 is divided into a memory area D for temporarily storing the contents of TOC data and a memory area A for storing the final program number on the outward path side. Every time the reproduction of the magnetic tape by the magnetic tape reproducing apparatus is started, the contents of the memory area D are all initialized to "00".

FIG. 15 is a flow chart showing another example of the subroutine for storing the LPGM on the outward path (which constitutes step S3 of FIG. 9). Substep SS14
Then, from the auxiliary data demodulated by the auxiliary data demodulation section 5 of the microcomputer 7, the TO included in the auxiliary data is demodulated.
Read C data.

Next, in sub-step SS15, it is determined whether or not reading of all items of the table of contents information has been completed. This determination is made based on, for example, whether or not the same table of contents information has been read twice. This is because one table of contents information, for example, TOCITEM "01" table of contents information appears once, and before another table of contents of other TOCITEM always appears once. If all the items of the table of contents information have not been read, the process proceeds to sub-step SS16.

In sub-step SS16, sub-step SS
It is determined whether the TOCITEM of the TOC data read in 14 is the code AE. Substep SS16
When it is determined that the code is AE, the process proceeds to sub-step SS17.

In sub-step SS17, sub-step SS
When the code AE is detected in 16, the content of this TOC data, that is, the absolute time of the forward path side recording end position is stored in the memory C. Then, the code AE detected flag is set (substep SS18), and the subroutine ends.

If the code AE is not detected in sub-step SS16, the process proceeds to sub-step SS19, and it is determined whether or not the code AE detected flag is set. When it is not set, the subroutine is ended.

On the other hand, if the code AE detected flag is set, the process proceeds to sub-step SS20, and it is determined whether the TOCITEM of the read TOC data is code 01 to code 99. If the TOCITEM of the read TOC data is code 01 to code 99, the TOC data is compared with the absolute time data stored in the memory C (substep SS21). TO
If CITEM is other than code 01 to code 99,
Finish the subroutine.

As a result of the comparison in this sub-step SS21,
If the TOC data of the table-of-contents information read this time is smaller than the contents of the memory C, this TOC data is the absolute time indicating the program position on the outward path, so the process proceeds to the next substep SS22. However, TOC data is stored in memory C
If it is greater than or equal to the content of, the TOC data is for the program on the return path side, so the subroutine is terminated.

The sub-step SS22 is for the read TO
A step of comparing the C data with the contents of the memory D,
As a result, the maximum absolute time indicating the program position on the outward path is stored in the memory D. That is, as a result of the comparison in sub-step SS22, when the newly read TOC data is larger than the data already stored in the memory D, the process proceeds to sub-step SS23 to store the new TOC data in the memory D (sub-step SS23). ), The code number of the TOC data is stored in the memory A (substep SS24).

If it is determined in sub-step SS15 that all the series of table-of-contents information has been read, sub-step SS
Go to 25. In this sub-step SS25, it is assumed that the last program number (LPGM) on the outward path has been stored in a predetermined memory area, and a storage completion flag is set, for example. As a result, the code number of the TOC data stored in the memory A is handled as the forward path final program number.
Further, thereafter, the determination result in step S2 is YES.

Similarly, it is possible to detect the TOCITEM including the absolute time data having the minimum content from the TOC data of all the programs recorded on the return path side, and store the return path start program number from the TOCITEM. is there.

FIG. 16 is a diagram showing a memory configuration necessary for determining the leading program number on the return path side. Three storage areas B in the RAM 15 of the magnetic tape reproducing device,
C and E are secured, and auxiliary data for high-speed search in the microcomputer 7 is stored. That is, the RAM 15 includes a memory area C for storing the contents of the TOCITEM code AE among the reproduced auxiliary data, a memory E for temporarily storing the contents of the TOC data of the codes 01 to 99, and a return path. It is divided into a memory B for storing the leading program number on the side. Every time the magnetic tape is reproduced by the magnetic tape reproducing apparatus, the contents of the memory E are all "FF (HE
X) ”is initially set.

FIG. 17 is a flow chart showing another example of the subroutine for storing the FPGM on the return path side (which constitutes step S16 of FIG. 10). Sub step SS2
6, the auxiliary data demodulation unit 5 of the microcomputer 7
From the auxiliary data demodulated by
Read OC data.

Next, in sub-step SS27, it is judged whether or not reading of all items of the table of contents information is completed. If not completed, the process proceeds to sub-step SS28.

In sub-step SS28, sub-step SS
It is determined whether the TOCITEM of the TOC data read at 26 is the code AE. Substep SS28
If it is determined that the code is AE, the process proceeds to sub-step SS29.

In substep SS29, in substep SS
When the code AE is detected at 28, the content of this TOC data, that is, the absolute time of the forward path side recording end position is stored in the memory C. Then, the code AE detected flag is set (sub-step SS30), and the subroutine ends.

When the code AE is not detected in sub-step SS28, the process proceeds to sub-step SS31, and it is determined whether or not the code AE detected flag is set. When it is not set, the subroutine is ended.

On the other hand, if the code AE detected flag is set, the process proceeds to sub-step SS32, and it is determined whether the TOCITEM of the read TOC data is code 01 to code 99. If the TOCITEM of the read TOC data is code 01 to code 99, the TOC data is compared with the absolute time data stored in the memory C (substep SS33).

As a result of the comparison in this substep SS33,
If the TOC data of the table-of-contents information read this time is larger than the contents of the memory C, this TOC data is the absolute time indicating the program position on the return path side, and the process proceeds to the next substep SS34. However, TOC data is stored in memory C
If it is smaller than or equal to the content of, the TOC data is for the program on the return path side, so the subroutine is terminated.

The sub-step SS34 is the read TO
A step of comparing the C data with the contents of memory E,
As a result, the minimum absolute time indicating the program position on the return path side is stored in the memory E. That is, as a result of the comparison in sub-step SS34, when the newly read TOC data is smaller than the data already stored in the memory E, the process proceeds to sub-step SS35 to store the new TOC data in the memory E (sub-step SS35). ), The code number of the TOC data is stored in the memory B (substep SS36).

If it is determined in sub-step SS27 that all of the series of table-of-contents information has been read, sub-step SS
Proceed to 37. In this sub-step SS37, it is assumed that the first program number (FPGM) on the homeward side has been stored in the predetermined memory area, and a storage completion flag is set, for example. As a result, the code number of the TOC data stored in the memory B is treated as the return side leading program number.
After that, the determination result in step S15 is YES.
Becomes

FIG. 18 is a diagram showing a memory configuration necessary for determining the return-side FPGM together with the forward-side LPGM. As described in FIG. 13 as an example of the memory configuration of the third embodiment, when the two subroutines of the fourth embodiment are simultaneously executed in the magnetic tape reproducing apparatus,
It is necessary to separately store the final program number on the forward path side and the leading program number on the backward path side in each area of the memories A and B secured in the RAM 15. In that case,
As shown in FIG. 8, there are five storage areas A to E in the RAM 15.
Is ensured, and auxiliary data for high-speed search in the microcomputer 7 is stored in each.

Example 5. In the determination of the final program number on the forward path side or the backward program number on the forward path side in the fourth embodiment, the TOCITEM is used when determining whether the main data corresponding to the read TOC data is recorded on the forward path or the backward path. I was using the code AE.
However, the TO that constitutes the table of contents information of the auxiliary data recording area
In some cases, the C data does not include the code AE item, and the final recording position on the forward path side cannot be determined. Figure 5
This is because the table-of-contents information in the recording format shown in (1) is not always recorded when recording all magnetic tapes. In such a case, of the read table of contents information, the flag data S recorded in the most significant bit of byte 2 is used to determine the final program number (LP
GM). The processing procedure therefor will be described below.

The flag data S is bit information for distinguishing the outward and return paths. For example, if the main data is recorded on the outward path, the flag data of the TOC data is S =
0, if the main data is recorded on the return path side, the flag data of the TOC data is recorded as bit information of S = 1.

FIG. 19 is a flow chart showing a subroutine (which constitutes step S3 of FIG. 9) for storing the final program number on the outward path using the flag data S. Here, similar to the procedure of FIG. 11 shown in the third embodiment, the memory A is secured in the RAM 15 as a memory area for storing the forward path final program number. The contents of the memory A must be initialized to "00" when the high speed search is instructed.

In sub-step SS38, TOC data contained therein is read from the auxiliary data demodulated by the auxiliary data demodulating section 5 of the microcomputer 7.

Next, in sub-step SS39, it is determined whether or not reading of all items of the table-of-contents information is completed. If not completed, the process proceeds to sub-step SS40.

In substep SS40, the read T
TOCITEM of OC data is code 01 to code 9
It is determined whether it is 9. If the TOCITEM of the read TOC data is code 01 to code 99, it is further determined whether or not the flag bit S is 0 (substep SS41). If the flag bit S is not 0, this TOC data is the table of contents information about the program on the return path, so the subroutine is terminated.

If the flag bit is 0, the read TOC data is the table of contents information for the program on the outward path. Therefore, the code number of the TOCITEM is compared with the code number stored in the memory A (sub-step). SS42), if the newly read code number of TOCITEM is larger than the code number previously read and stored in the memory A, sub-step SS
Proceed to 43. If it is not larger than the code number already stored, this TOC data is not for the forward path final program, and the subroutine is terminated.

This sub-step SS43 is a step of storing the code number of the newly read TOCITEM in the memory A, and this is the table of contents information of the forward path side program, and is the maximum of the code numbers already read. Are stored in the memory A.

If it is determined in sub-step SS39 that all the series of table-of-contents information has been read, sub-step SS
Proceed to 44. In this sub-step SS44, it is assumed that the last program number (LPGM) on the outward path has been stored in the predetermined memory area, and a storage completion flag is set. As a result, the code number of the TOC data stored in the memory A is handled as the forward path final program number.
Further, thereafter, the determination result in step S2 is YES.

FIG. 20 is a flow chart showing a subroutine (which constitutes step S16 in FIG. 10) for storing the return side leading program number using the flag data S. In sub-step SS45, the TOC data contained therein is read from the auxiliary data demodulated by the auxiliary data demodulating section 5 of the microcomputer 7.

Next, in sub-step SS46, it is determined whether or not reading of all items of the table-of-contents information is completed. If not completed, the process proceeds to sub-step SS47.

In substep SS47, the read T
TOCITEM of OC data is code 01 to code 9
It is determined whether it is 9. If the TOCITEM of the read TOC data is code 01 to code 99, it is further determined whether or not the flag bit S is 1 (substep SS48). If the flag bit S is not 1, this TOC data is the table of contents information for the program on the outward path, and the subroutine is terminated.

If the flag bit is 1, the read TOC data is the table of contents information for the backward path program, so the code number of the TOCITEM is compared with the code number stored in the memory B (sub-step). SS49), if the newly read TOCITEM code number is smaller than the code number previously read and stored in memory B, sub-step SS
Go to 50. If it is not smaller than the code number already stored, this TOC data is not for the return-side top program, and the subroutine is terminated.

This sub-step SS50 is a step of storing the newly read code number of TOCITEM in the memory B, and this is the index information of the backward path program and is the smallest of the code numbers already read. Are stored in the memory B.

If it is determined in sub-step SS46 that all of the series of table-of-contents information has been read, sub-step SS
Proceed to 51. In this sub-step SS51, it is assumed that the first program number (FPGM) on the return path has been stored in a predetermined memory area, and a storage completion flag is set, for example. As a result, the code number of the TOC data stored in the memory B is treated as the return side leading program number.
After that, the determination result in step S15 is YES.
Becomes Example 6.

In the magnetic tape reproducing apparatus of the first or second embodiment described above, the step S of FIG. 9 or FIG.
As shown in 6 and step S19, at the time when the high-speed search command is given, if the storage of the forward-path side final program number and the backward-path side first program number is not completed,
The conventional high-speed search routine, which takes a relatively long time, is executed. However, if a high-speed search is instructed almost at the same time as the start of reproduction, in many cases the
In the storage routine of 3 or step S16, the storage of the forward-side final program number and the backward-side first program number is not yet completed.

Particularly, according to the procedure of the above-mentioned Examples 3 to 5,
All TOs from the auxiliary data recording tracks T1 and T18
If the high-speed search command is given before the C data is read, the determination of the forward-side final program number or the backward-side first program number may not be completed. Moreover, when many kinds of programs are recorded on the magnetic tape as the main data, the table-of-contents information of the auxiliary data is recorded over a large recording area, and a certain reproduction time is required to read all of it. .

Therefore, in order to shorten the program search time as much as possible, even if the detection of the final program number on the outward path or the first program number on the backward path is not completed at the time when the high speed search is instructed, this execution is performed. In Example 6, after the command for high speed search is received, the execution of the command is postponed until the final program number on the outward path is stored.

FIG. 21 is a flowchart showing the procedure of high speed search in the magnetic tape reproducing apparatus of the sixth embodiment, which is a partial modification of the procedure of FIG. 9 shown in the first embodiment.

When the reproducing operation is instructed from the display / operation section 8, the microcomputer 7 instructs the mechanism driving section 2 to perform the reproducing mode, and the reproducing operation in step S1 is started.

In step S2, the microcomputer 7 determines the final program number (LP
It is determined whether the storage of GM) is completed.

Step S3 is a subroutine for storing the final program number on the outward path, which is executed when it is not completed. Here, the auxiliary data demodulation unit 5
The TOC data in the auxiliary data demodulated by is read, and the subroutine shown in the above-mentioned third to fifth embodiments is executed.
It is repeatedly executed until the final program number on the outward path is read. LPGM is RA of microcomputer 7
When it is stored in the memory area secured in M, the process proceeds to the next step S4.

If it is determined in step S4 that a high-speed search instruction has been input by operating the switch of the display / operation section 8, the process proceeds to step S7. If not, the process returns to step S2.

In the sixth embodiment, the subroutine of step S3 is repeatedly executed without determining whether or not there is a high speed search instruction until it is determined that the LPGM storage is completed. Then, after the last program number on the outward path is stored in the memory A secured in the RAM 15 of the microcomputer 7, the process proceeds to the next step S4, and the high speed search is executed.

Therefore, unlike the first embodiment, after it is determined in step S4 that there is a high speed search command, L
Since the storage of the PGM has been completed, the process proceeds to step S7 without performing the determination in step S5, and based on the generated target program number (TPGM), a fast search in the fast-forward direction (forward search) or a rewinding direction. The high-speed search (reverse search) is executed (steps S12 and S13). The procedure after step S7 is the same as in the case of the first embodiment, and details thereof are omitted here.

Example 7. In the seventh embodiment, after the command for the high speed search is received, the execution of the command is postponed until the return side leading program number is stored.
As a result, as in the case of the sixth embodiment, even when the detection of the forward-side final program number or the backward-side first program number has not been completed at the time when the high-speed search is instructed, the program search is performed. The time for can be shortened.

FIG. 22 is a flowchart showing the procedure of high-speed search in the magnetic tape reproducing apparatus of the seventh embodiment, which is a partial modification of the procedure of FIG. 9 shown in the second embodiment. When the reproduction operation is instructed by the display / operation unit 8, the microcomputer 7 instructs the mechanism drive unit 2 to perform the reproduction mode, and the reproduction operation of step S14 is started.

In step S15, the microcomputer 7 causes the leading program number (F
PGM) storage is completed.

Step S16 is a subroutine for storing the leading program number on the return path, which is executed when it is not completed. Here, the TOC data in the auxiliary data demodulated by the auxiliary data demodulating unit 5 is read, and the subroutines described in the third to fifth embodiments are repeatedly executed until the backward program head program number is read. When the FPGM is stored in the memory area secured in the RAM 15 of the microcomputer 7, the process proceeds to the next step S17.

In step S17, the display / operation unit 8
If a high-speed search instruction is input by operating the switch, the process proceeds to step S20. If not, otherwise,
It returns to step S15.

In the seventh embodiment, until it is determined in step S15 that the storage of the FPGM is completed,
The subroutine of step S16 is repeatedly executed without determining whether or not there is a high-speed search instruction. Then, after the first program number on the return path side is stored in the memory B secured in the RAM 15 of the microcomputer 7, the process proceeds to the next step S17, and the high speed search is executed.

Therefore, unlike the second embodiment, after it is determined in step S17 that there is a high speed search command,
Since the storage of the FPGM is completed, the process proceeds to step S20 without performing the determination in step S18, and based on the generated target program number (TPGM),
A high-speed search in the fast-forward direction (forward search) or a high-speed search in the rewind direction (reverse search) is executed (steps S25 and S26). The procedure after step S20 is the same as that in the case of FIG. 10 according to the second embodiment, and the details are omitted here.

If the magnetic tape is a magnetic tape on which TOC data is repeatedly recorded over the entire recording area, such as a commercially available music tape, the TOC data can be reproduced at any position of the magnetic tape by the magnetic tape reproducing device. Data can be read. Therefore, Example 1,
In comparison with the search time of the second embodiment, even if the high speed search command is temporarily suspended and the reproducing operation is continued, the desired program can be searched in a short time as a result.

Also, by combining the sixth and seventh embodiments described above, the reproduction operation is continued even if the high-speed search is instructed when the detection of the forward-side final program number or the backward-side first program number is not completed. However, the high-speed search may be started for the first time when any program number is stored in the memory. With this configuration,
A more efficient high speed search can be executed.

[0156]

Since the present invention is constructed as described above, it has the following effects.

According to the magnetic tape reproducing method of the first aspect, the magnetic tape in which a plurality of programs are digitally recorded in the recording area recorded and reproduced by scanning in two directions is searched, and the desired program is promptly searched. You can search at high speed.

According to the method of claim 2, the final program number on the outward path can be determined by a small memory, and the time for searching for a program can be shortened.

According to the method of claim 3, the return-side final program number can be determined by a small memory, and the time for searching for a program can be shortened.

According to the method of the fourth aspect, the final program number on the outward path can be easily determined even with the magnetic tape in which the table-of-contents information is not recorded in order.

According to the method of the fifth aspect, even if the magnetic tape is not recorded with the table-of-contents information in order, the backward program head program number can be easily determined.

According to the method of claim 6, it is possible to easily determine the final program number on the outward path even if the magnetic tape does not record time information indicating the absolute time at the recording end position on the outward path. it can.

According to the method of claim 7, even if the magnetic tape is not recorded with the time information indicating the absolute time at the recording end position on the outward path, the backward program head program number can be easily determined. it can.

According to the magnetic tape reproducing apparatus of the eighth aspect, by only storing at least one of the forward side final program number and the backward path first program number of the demodulated table of contents information, the recording area currently being reproduced is recorded. Even if you are instructed to search for a program recorded in a different recording area from the
A desired program can be searched at high speed.

According to the ninth aspect of the invention, the search is not started until at least one of the forward-side final program number and the backward-direction first program number is stored in the storage means, and the program is surely stored. The search time can be shortened.

According to the apparatus of claim 10, the high-speed search can be started immediately when at least one of the last program number on the outward path and the first program number on the backward path is stored.
The time for searching for programs can be further reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magnetic tape reproducing apparatus of the present invention.

FIG. 2 is a perspective view showing an external configuration of a magnetic tape reproducing device.

FIG. 3 is a diagram showing an example of a track pattern recorded on a magnetic tape.

FIG. 4 is a diagram showing an example of a recording format of auxiliary data.

FIG. 5 is a diagram showing an example of a recording format of TOC data.

FIG. 6 is a diagram showing an example of TOC data.

FIG. 7 is an explanatory diagram showing an example of a tape traveling path in a high speed search.

FIG. 8 is an explanatory diagram showing an array of auxiliary data recorded on a magnetic tape.

FIG. 9 is a flowchart showing a high-speed search procedure in the magnetic tape reproducing apparatus according to the first embodiment.

FIG. 10 is a flowchart showing a high-speed search procedure in the magnetic tape reproducing apparatus according to the second embodiment.

FIG. 11 is a flowchart showing an example of an LPGM storage procedure.

FIG. 12 is a flowchart showing an example of a FPGM storage procedure.

FIG. 13 is a diagram showing an example of a memory configuration in a magnetic tape reproducing device according to a third embodiment.

FIG. 14 is a diagram showing an example of a memory configuration in a magnetic tape reproducing device according to a fourth embodiment.

FIG. 15 is a flowchart showing an example of an LPGM storage procedure.

FIG. 16 is a diagram showing an example of a memory configuration in a magnetic tape reproducing device according to a fourth embodiment.

FIG. 17 is a flowchart showing an example of a FPGM storage procedure.

FIG. 18 is a diagram showing an example of a memory configuration necessary for determining LPGM and FPGM.

FIG. 19 is a flowchart showing an example of an LPGM storage procedure using flag data S.

20 is a flowchart showing an example of an FPGM storage procedure using a flag bit S. FIG.

FIG. 21 is a flow chart showing the procedure of a high speed search in the magnetic tape reproducing apparatus in the sixth embodiment.

FIG. 22 is a flow chart showing the procedure of a high speed search in the magnetic tape reproducing apparatus in the seventh embodiment.

[Explanation of symbols]

1 cassette, 2 mechanism drive unit, 4 main data demodulation unit, 5 auxiliary data demodulation unit, 7 microcomputer, 8 operation unit, 15 RAM.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 8

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art A conventional analog magnetic tape reproducing apparatus has a function of locating a desired piece of music when reproducing music or the like. As a method of realizing such a program (track) cueing function, for example, a method of running a tape at high speed to detect a non-recorded portion on a magnetic tape has been adopted. Further, in recent years, a digital audio tape recorder (DAT: Digital Audio Tape Recorde) capable of recording / reproducing with high sound quality by digital recording.
r) and other magnetic tape playback devices are becoming popular. In this type of digital recording, the main recorded information such as music (below
Below, it is called the main data. ) , Position information indicating the recording position of the music on the magnetic tape, music number information indicating the recording order, and the like can be recorded as auxiliary data.
Therefore, even if the inter-track portion is not detected, by using such auxiliary data, for example, by running the magnetic tape at high speed while reproducing the label information indicating the beginning position of each program, the desired song can be played in a short time. Can be selected.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The apparatus according to claim 8 searches a magnetic tape in which a plurality of programs are digitally recorded in a recording area which is recorded and reproduced by scanning in two directions, and a magnetic tape reproducing apparatus which searches for a desired program at high speed. At
Driving means for reciprocating the magnetic tape, auxiliary data demodulating means for demodulating auxiliary data including at least absolute program number and table of contents information digitally recorded on the magnetic tape, and a final program on the forward path side of the demodulated table of contents information. number or storage means for storing at least one of the return path leading program number, and controls the drive means on the basis of the program numbers stored in the storage means and auxiliary data demodulated by said auxiliary data demodulation means, designated, And a high-speed search means for searching the start position of the stored program.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

FIG. 4 is a diagram showing an example of a recording format of auxiliary data recorded on the track T1 (outward path side) and the track T18 (return path side). This recording format uses 15 bytes from byte 0 to byte 14 as one repeating unit. Further, auxiliary data necessary for controlling all the main data is recorded on the tracks T1 and T18 of the magnetic tape 30. And this auxiliary data is repeatedly recorded on the tape position corresponding to the entire range where the main data is recorded, for example, in a commercially available music tape, and in many cases, it is a normal recording tape (blank tape). in, each forward backward recording start position, auxiliary data group corresponding to the main data it
It is only once is recorded. However, as will be described later, not all of these auxiliary data are recorded in such a recording format on all magnetic tapes.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

In FIG. 4, the absolute program number (APGM) recorded in byte 0 corresponds to, for example, the music number when music is recorded as the main data, and is recorded as the main data by this APGM. Up to 99
The programs (01 to 99) can be identified. The absolute time data recorded in the following bytes 1 to 3 is time information indicating the time required to reproduce the program recorded as the main data from the recording start position (start position) of the tape to that position. is there. The absolute time data, second digits data (byte 3), minute digits data (byte 2) is constituted by a time-digit data (low-order 4 bits of byte 1) and the frame number data (bits 4-6 of byte 1), The tape position of the recorded program can be identified. The flag data S of the most significant bit of the byte 1 is bit information for distinguishing the forward and backward paths. For example, when the program is recorded on the forward path, S = 0, and it is recorded on the backward track. , S = 1.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

In the recording format of FIG. 4, the program elapsed time data recorded in bytes 4 to 6 is time information indicating the elapsed time from the recording start time of the program (music piece) currently being reproduced. . This time information is also
Similar to absolute time data, second digit data (byte 6), minute digit data (byte 5), hour digit data (lower 4 of byte 4)
Bit) and frame number data (bit 4 of byte 4)
Is constituted by 6), it can be identified tape position in the program.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

Further, if TOCITEM is the code 0A of the first type, all the following bytes 2 to 4 have the full description.
First program number and last program number in recording area
The number of No. and TOC data is recorded. For music tapes where subcode groups are repeatedly recorded in the entire range of magnetic tape, TOCITEM code 0A is
Functions as a delimiter code for reading a series of table of contents information. Usually, these contents information is code 0A, 01.
, AE, XX, ..., BE (XX is a code corresponding to the leading program number on the return path side) are recorded in this order.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

FIG. 8 is an explanatory diagram showing the arrangement of auxiliary data recorded on the magnetic tape of FIG. In the magnetic tape portion shown in FIG., The upper half is a forward path recording area, program number # 4 programs are recorded as the main data, the Rukoto scanned magnetic head from the left of Figure to right, the program With auxiliary data track
Read from T1 . Further, the lower half of the magnetic tape is a backward path recording area, and program numbers # 9 and # 10 are recorded as main data. By Rukoto magnetic head is scanned in the direction from right to left in the figure, if these programs are read sequentially at the same time, the track T1
The auxiliary data is read from 8 .

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Change

[Correction content]

Further, in the case of the magnetic tape shown in FIG.
As described with reference to FIG. 4, the auxiliary data is repeatedly recorded in the format having the absolute program number as the first byte. Here, since the programs # 1 to # 12 are recorded as main data on the magnetic tape in the recording areas on the forward path side and the backward path side, respectively, as shown in FIG.
Code 0 corresponding to the program number as auxiliary data
1 to 12 and a total of 15 items of 0A, AE, and BE, that is, table of contents information composed of 15 TOC data (TOC1 to TOC15) is recorded, and absolute time data T _i , T _{i + 1} , ... T _{i + n + 2,} ... and the program elapsed time data _{t j, t j + 1,} ... t k, ... t 0, ... are recorded.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction content]

Step S3 is a subroutine for storing the final program number (LPGM) on the outward path. This is executed by reading the table-of-contents information from the auxiliary data demodulated by the auxiliary data demodulation unit 5, and for example, the outward side final program number is determined by the procedure shown in Examples 3 to 5 described later, The program number is stored in the memory area secured in the RAM 15 of the microcomputer 7.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction content]

The microcomputer 7 determines again whether or not the forward path final program number is stored (step S5). Even if the subroutine is executed in step S3, the necessary forward index information may not be read from the magnetic tape depending on the tape traveling position, and thus the forward path final program number may not be stored.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0060

[Correction method] Change

[Correction content]

In step S10, the microcomputer 7 uses the auxiliary data demodulated by the auxiliary data demodulating section 5 in steps S7 and S8 to determine the absolute program number (APG) of the tape position currently being reproduced.
Read M).

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0068

[Correction method] Change

[Correction content]

Step S16 is a subroutine for storing the leading program number on the return path, which is executed when it is not completed. As a result, the table-of-contents information in the auxiliary data demodulated by the auxiliary data demodulation unit 5 is sequentially read, the return side head program number is determined, and the program number is stored in the RAM 1 of the microcomputer 7.
The data is stored in the memory area secured in 5 .

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0075

[Correction method] Change

[Correction content]

In step S23, the microcomputer 7 uses the auxiliary data demodulated by the auxiliary data demodulating section 5 in steps S21 and S22 to determine the absolute program number (AP) of the tape position currently being reproduced.
Read GM).

[Procedure Amendment 15]

[Document name to be amended] Statement

[Name of item to be corrected] 0083

[Correction method] Change

[Correction content]

When detecting the absolute program number of the final program on the outward path, the microcomputer 7 uses the TO
Each time the C data is read, the TOCITEM is updated and stored in the memory area secured in the RAM 15, so that the T stored in the memory area when the code AE is detected.
Final program on the outbound side from OCITEM (LPGM)
Can be determined.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0089

[Correction method] Change

[Correction content]

[0089] Sub-step SS5, when detecting the code AE in substep SS2, as the forward side of the last program number (LPGM) is stored in a predetermined memory area, Ru and has a flag, for example, storage completion. After that, the determination result in step S2 is YES.

[Procedure Amendment 17]

[Document name to be amended] Statement

[Name of item to be corrected] 0122

[Correction method] Change

[Correction content]

Example 5. In the determination of the final program number on the forward path side or the leading program number on the backward path side in the fourth embodiment, the main data corresponding to the read TOC data is recorded on either the forward path or the backward path. I used TOCITEM's code AE to judge whether or not it was. However, the TOC data forming the table of contents information of the auxiliary data recording area does not include the item of code AE, and the final recording position on the forward path side may not be discriminated. This is because the table-of-contents information in the recording format shown in FIG. 5 is not always recorded when recording all magnetic tapes. In such a case, of the read table of contents information, the flag data S recorded in the most significant bit of byte 2 is used to determine the final program number (LPGM) on the outward path side. The processing procedure therefor will be described below.

[Procedure 18]

[Document name to be amended] Statement

[Correction target item name] 0143

[Correction method] Change

[Correction content]

Step S3 is a subroutine for storing the final program number on the outward path, which is executed when it is not completed. Here, the auxiliary data demodulation unit 5
The TOC data in the auxiliary data demodulated by is read, and the subroutine shown in the above-mentioned third to fifth embodiments is executed.
It is repeatedly executed until the final program number on the outward path is read. When the forward path final program number is stored in the memory area secured in the RAM 15 of the microcomputer 7, the process proceeds to the next step S4.

[Procedure Amendment 19]

[Document name to be amended] Statement

[Name of item to be corrected] 0145

[Correction method] Change

[Correction content]

In the sixth embodiment, the outward route final program
Until it is determined that the storage of the number is completed, it is not determined whether or not there is a high-speed search instruction.
The subroutine 3 is repeatedly executed. Then, the final program number on the outward path is RA of the microcomputer 7.
After being stored in the memory A secured in M15, the process proceeds to the next step S4, and the high speed search is executed.

[Procedure amendment 20]

[Document name to be amended] Statement

[Name of item to be corrected] 0146

[Correction method] Change

[Correction content]

[0146] Therefore, after it is determined that unlike Example 1, there are command for high-speed search at step S4, the forward
Since the storage of the roadside final program number has been completed, the process proceeds to step S7 without performing the determination in step S5, and the generated target program number (TPGM)
Based on the above, a high-speed search in the fast-forward direction (forward search) or a high-speed search in the rewinding direction (reverse search) is executed (steps S12 and S13). The procedure after step S7 is the same as in the case of the first embodiment, and details thereof are omitted here.

[Procedure correction 21]

[Document name to be amended] Statement

[Name of item to be corrected] 0148

[Correction method] Change

[Correction content]

FIG. 22 is a flow chart showing the procedure of high speed search in the magnetic tape reproducing apparatus of the seventh embodiment, which is a partial modification of the procedure of FIG. 10 shown in the second embodiment. When the reproduction operation is instructed by the display / operation unit 8, the microcomputer 7 instructs the mechanism drive unit 2 to perform the reproduction mode, and the reproduction operation of step S14 is started.

[Procedure correction 22]

[Document name to be amended] Statement

[Correction target item name] 0150

[Correction method] Change

[Correction content]

Step S16 is a subroutine for storing the leading program number on the return path, which is executed when it is not completed. Here, the TOC data in the auxiliary data demodulated by the auxiliary data demodulating unit 5 is read, and the subroutines described in the third to fifth embodiments are repeatedly executed until the backward program head program number is read. When the first program number on the return path side is stored in the memory area secured in the RAM 15 of the microcomputer 7, the process proceeds to the next step S17.

[Procedure amendment 23]

[Document name to be amended] Statement

[Correction target item name] 0152

[Correction method] Change

[Correction content]

In the seventh embodiment, it is not judged whether or not there is a high-speed search instruction until it is judged in step S15 that the return-side leading program number has been stored, and the subroutine of step S16 is executed. Is repeatedly executed. Then, after the return side top program number is stored in the memory B secured in the RAM 15 of the microcomputer 7, the process proceeds to the next step S17,
It is configured to perform a fast search.

[Procedure correction 24]

[Document name to be amended] Statement

[Name of item to be corrected] 0153

[Correction method] Change

[Correction content]

Therefore, unlike the second embodiment, after it is determined in step S17 that there is a high speed search command,
Since the return side top program number has been stored,
Without performing the determination in step S18, step S20
Proceed to, and the generated target program number (TPG
Based on M), a high-speed search in the fast-forward direction (forward search) or a high-speed search in the rewinding direction (reverse search) is executed (steps S25 and S26). In addition,
The procedure after step S20 is the same as in the case of FIG. 10 shown in the second embodiment, and the details are omitted here.

[Procedure correction 25]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

[Procedure Amendment 26]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 21

[Correction method] Change

[Correction content]

FIG. 21

Claims (10)

[Claims] 1. A magnetic tape reproducing method for searching a magnetic tape in which a plurality of programs are digitally recorded in a recording area to be recorded and reproduced by scanning in two directions and searching for a desired program at high speed. The program number of the final program recorded in the recording area on the outward path by reproducing the auxiliary data,
And a first step of storing at least one of the program numbers of the first program recorded in the recording area on the backward path, the program number of the target program to be searched, and the stored program number Then, a second step of determining whether the target program exists in the forward path side or the backward path side recording area, and it is determined in the second step that the target program exists in a recording area different from the auxiliary data. And a third step of performing a high-speed search by reversing the running direction of the magnetic tape. 2. In the first step, a code indicating the recording end position of the recording area on the outward path is detected from the table of contents information included in the auxiliary data, and the index information on the outward path is detected immediately before the code. The magnetic tape reproducing method according to claim 1, wherein a final program number is determined. 3. In the first step, a code indicating the recording end position of the recording area on the outward path is detected from the table of contents information included in the auxiliary data, and the code on the return path is detected immediately after that. 2. The magnetic tape reproducing method according to claim 1, wherein the top program number is determined. 4. In the first step, of the table of contents information contained in the auxiliary data, time information indicating an absolute time at a recording start position of each program on the magnetic tape, and an absolute time at a recording end position on the forward path side. The final program number on the outward path is determined from the index information indicating the maximum absolute time in the table of contents information smaller than the absolute time at the recording end position on the outward path by detecting the time information indicating The magnetic tape reproducing method according to claim 1, wherein 5. In the first step, time information indicating the absolute time at the head position of each program on the magnetic tape in the table of contents information contained in the auxiliary data and the absolute time at the recording end position on the forward path side are recorded. The leading program number on the return side is determined from the index information indicating the smallest absolute time in the index information that is larger than the absolute time at the recording end position on the outward path by detecting Claim 1 characterized by the above.
The magnetic tape reproducing method described in. 6. In the first step, bit information for identifying a recording area of each program recorded on the forward path or the backward path of the magnetic tape in the table of contents information included in the auxiliary data is detected, and the bit information is detected. 2. The magnetic tape reproducing method according to claim 1, wherein the final program number on the outward path is determined from the table of contents information indicating the maximum absolute time among the table of contents information classified on the outward path by. 7. In the first step, bit information for identifying a recording area of each program recorded on the forward path or the backward path of the magnetic tape in the table of contents information included in the auxiliary data is detected, and the bit information is detected. 2. The magnetic tape reproducing method according to claim 1, wherein the leading program number on the return path side is determined from the index information indicating the minimum absolute time among the index information divided on the return path side. 8. A magnetic tape reproducing apparatus for searching a magnetic tape in which a plurality of programs are digitally recorded in a recording area to be recorded and reproduced by scanning in two directions and searching for a desired program at high speed. Drive means for reciprocating drive, auxiliary data demodulation means for demodulating auxiliary data including at least absolute program number and table of contents information digitally recorded on the magnetic tape, forward program final program number of demodulated table of contents information,
Alternatively, a storage unit that stores at least one of the first program numbers on the return path side, and the drive unit is controlled and designated based on the auxiliary data read by the auxiliary data demodulation unit and the program number stored in the storage unit. A magnetic tape reproducing apparatus comprising: a high-speed search means for searching a start position of a program. 9. The high-speed search means does not start the search until at least one of the forward-path-side final program number and the backward-path-side leading program number is stored in the storage means. Magnetic tape player. 10. The storage means has an area for storing a forward-path-side final program number and a backward-path-side leading program number, respectively.
Alternatively, the magnetic tape reproducing device according to claim 9.