JPH02273387A - Information reproduction system - Google Patents

Abstract

PURPOSE:To prevent such a defective case where a set program number is erased by mistake with the cut-off of a power supply, the ejection of a cassette, etc., by recording the information on a table of contents to be reproduced next at a prescribed position of each selected record information and carrying out the reproduction of information based on the information on the table of contents. CONSTITUTION:The record information to be reproduced are selected in the order of reproduction, and the data including a program step and a program number and showing the recording position of each selected record information is set to a program memory. Then the run of a recording medium is controlled and the recording positions of each record information are successively checked on the recording medium. Then the information on a table of contents which includes a PC3, a PC4 and a PC5 showing a program step 1, a program number 06, and the program start respectively is recorded at a position set right before the start of the music information 6 recorded on a retrieved magnetic tape T. Then the PC3... showing a program step 2 are successively recorded at the end position of the information 6. In a reproduction state, the information on the table of contents is read and the record position is retrieved for reproduction of the record information.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to selecting a plurality of arbitrary program information from among program information such as music information recorded on a recording medium such as a magnetic tape. The present invention relates to an information reproducing method that reproduces information in sequence, and is particularly suitable for application to a rotary head type digital audio tape recorder.

(Prior Art) FIG. 9 is a block diagram showing a conventional information reproducing system applied to a rotary head type digital audio tape recorder (hereinafter referred to as R-DAT).

In the configuration shown in FIG. 9, the mechanism section 1 supplies a supply reel from a cassette C inserted inside! a and winding-rule I! , pull out the magnetic tape T wound between b,
It has a loading mechanism for winding it around a rotating drum D, and the drawn-out magnetic tape T is guided by a capstan C, a pinch roller p, etc.

The rotating drum D has two magnetic heads Ha and Hb.
They are attached at positions facing each other at 80 degrees and are configured to read recorded information such as music information recorded on the magnetic tape T and subcode information to be described later.

The recorded information read by the magnetic heads Ha and Hb is supplied to the head amplifier 20 of the control unit 2 and amplified to an appropriate level, and the music information is output to an audio system (not shown) and converted into an acoustic signal. Ru. The subcode information is sent to the subcode reproducing circuit 21, separated and reproduced, and then sent to the program number storage circuit 2.
2 and the program end detection circuit 23.

The program memory 24 stores in advance the number of selected music information, that is, the program number, so that the operator can play back any music information in any order from among the plurality of music information recorded on the magnetic tape T. It is made up of a rewritable storage medium, such as a semiconductor memory.

The stored contents of the program memory 24 are read by the program execution circuit 25 and outputted to the search program number setting circuit 26 in reproduction order. The program number set in the setting circuit 26 is compared with the program number recorded in the program number storage circuit 22 by a comparison circuit 27. The comparison result is sent to the mechanism control circuit 28, which completely controls the mechanism section 1.

In this configuration, in order to reproduce music information according to the program number stored in the program memory 24,
First, the stored contents of the program memory 24 are loaded into the program execution circuit 25, and the program number of the music information to be played first is selected by the search program number setting circuit 25.
Set to 6.

The comparison circuit 27 compares the program number sent to the setting circuit 26 and the program number stored in the storage circuit 22, and outputs the comparison result to the mechanism control circuit 2B. When the comparison circuit 27 determines that the program number set in the setting circuit 26 is larger than the program number stored in the storage circuit 22, the mechanism control circuit 28 drives the magnetic tape T in the forward direction at high speed. However, when it is determined that the program number stored in the storage circuit 22 is larger than the program number set in the setting circuit 26, the magnetic tape T is driven in the reverse direction at high speed. When the magnetic tape T is run at high speed, the stored contents of the program number storage circuit 22 are rewritten every time the subcode reproducing circuit 21 detects a program number stored in the subcode area of the magnetic tape T.

When the comparison circuit 27 detects that the two program numbers match, the mechanism control circuit 2B issues a command to the mechanism section 1 to stop the high-speed drive of the magnetic tape T. Thereafter, a command is given to play back the searched music information using normal playback operations.

When the reproduction of the searched music information is completed and the program end detection circuit 23 detects the end, the program execution circuit 25 sets the program number of the music information to be reproduced next in the search program number setting circuit 26. Then, the same operations as described above are repeated to perform music information search and playback processing.

In this way, the music information reproduction process is performed according to the music information program number set in the program memory 24 by the operator.

[Problems to be Solved by the Invention] In the conventional example described above, when the system power is turned off or the cassette C is removed from the mechanism section 1, the contents stored in the program memory 24 are erased. For this reason, it is conceivable to use non-volatile memory as the program memory 24, but it would require a large capacity memory to store the program number set for each cassette, and it would also be necessary to identify the cassette during playback. Not appropriate.

SUMMARY OF THE INVENTION An object of the present invention is to prevent a program number set by an operator from being erased by turning off the power, ejecting a cassette, or the like.

[Failure to solve the problem]

According to the present invention, when a plurality of arbitrary pieces of recorded information are selected from among pieces of recorded information recorded on a recording medium and reproduced in an arbitrary order, the recorded information is placed at a predetermined position of each of the selected pieces of recorded information. Record table of contents information including positional data of recorded information to be reproduced next, and upon reproduction, reproduce the selected recorded information in the arbitrary order according to the table of contents information 9
[Operation] First, the recorded information desired to be reproduced is selected in the reproduction order, and data indicating the recording position of each selected recorded information is set in the program memory. Next, the recording medium is controlled to travel and the recording position of each piece of set recording information is sequentially searched for on the recording medium. Then, table of contents information including position data of the recorded information to be reproduced next to the recorded information is sequentially recorded at predetermined positions of the retrieved recorded information.

At the time of reproduction, the table of contents information recorded at a predetermined position of each selected recorded information is read, the recording position of each recorded information on the recording medium is searched, and the recorded information is reproduced.

〔Example〕

FIG. 1 is a block diagram showing an embodiment in which the information reproducing method according to the present invention is applied to R-DAT, and parts corresponding to those in FIG. 9 will be described with the same reference numerals.

This embodiment consists of a mechanism section 1 into which a cassette C is loaded, and a control section 2 that controls this mechanism section 1. The mechanism section 1 includes a loading mechanism for pulling out the magnetic tape T from a loaded cassette C, and a head mechanism for writing and reading information on the magnetic tape T. The magnetic tape T is wound around a rotating drum D of a head mechanism by a capstan C, a pinch roller P, etc. that constitute a loading mechanism.

The rotating drum D has two magnetic heads Ha and Hb.
They are installed at 80 degrees opposite positions.

The control section 2 has a head amplifier 20 connected to the magnetic heads Ha and Hb, and the output of the head amplifier 20 is outputted to a program number storage circuit 22 and a program end detection circuit 23 via a subcode reproduction circuit 21.

The program number storage circuit 22 is the subcode reproduction circuit 21
The program number of the music information currently being read is detected and stored from among the subcode information separated and reproduced by the subcode information, and the program end detection circuit 23 is used to detect the end of the music information currently being read. be.

Furthermore, the control unit 2 has a program memory 24 . This memory 24 stores a program number of music information to be reproduced in order to select and reproduce arbitrary music information from a plurality of pieces of music information recorded on the magnetic tape T. The stored contents of the memory 24 are stored in the program execution circuit 25.
and is loaded into the program storage circuit 29.

The program execution circuit 25 is a circuit that, when reproducing music information according to the program number stored in the program memory 24, once loads the stored contents of the program memory 24 and sets the search program number setting circuit 26 one program number at a time. It is. The program number set in the setting circuit 26 is compared with the program number stored in the program number storage circuit 22 in the comparison circuit 27, and the comparison result is output to the mechanism control circuit 28.

The control circuit 28 controls the running of the magnetic tape T in the mechanism section 1 so that both program numbers match.

When the program storage circuit 29 stores the program number stored in the program memory 24 on the magnetic tape T, the program storage circuit 29 once loads the stored contents of the program memory 24 and searches the program number setting circuit 2 for one program number at a time.
This is the circuit to set the value to 6. The program number set in the setting circuit 26 is compared with the program number stored in the program number storage circuit 22 in a comparison circuit 27,
If they do not match, the mechanism control circuit 28 controls the running of the magnetic tape T. When a match is detected, the program storage circuit 29 outputs the stored contents to the subcode storage circuit 30. The subcode storage circuit 30 sends the supplied program number to the magnetic head Ha, via the head amplifier 20.
Hb and recorded in the subcode area of the magnetic tape T.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. It is assumed that each operation shown in the flowchart is performed under the control of a micro-blosse (not shown).

First, the operation of recording the program number set in the program memory 24 by the operator onto the magnetic tape T will be described. In addition, in the following explanation, music information 6 groan 3 →
Each program number is played in the order of 1 → 7.
It is assumed that the settings are set in the program memory 24 as shown in the figure.

First, it is determined whether a program number has been set in the program memory 24 (step SL).

In this case, since it has already been set, the determination is rYesJ. Next, it is determined whether the program recording mode is selected (step S2). In this case as well, since the recording mode has already been selected, the determination is ``Yes''.

Next, the program number set in the program memory 24 is loaded into the program recording circuit 29 (step S3), and the first program number is set in the search program number setting circuit 26 (step S4). In this example, program number 106 is set.

The program number set in the setting circuit 26 is compared with the stored contents of the program storage circuit 22 in a comparison circuit 27. If it is determined that the program number set in the setting circuit 26 is larger, the mechanism control circuit 28 drives the magnetic tape T in the forward direction at high speed. Conversely, if it is determined that the memory content of the memory circuit 22 is large, the mechanism control circuit 2
8 drives the magnetic tape T in the opposite direction at high speed. As the magnetic tape T runs at high speed, the stored contents of the program number storage circuit 22 are sequentially rewritten, and when the comparison circuit 27 detects that the two program numbers match, the mechanism control section 28 causes the mechanism section 1 to read the magnetic tape T. A command is issued to stop the high-speed drive of the search engine, and the search operation is ended (step S5).

Next, it is determined whether the data to be recorded on the magnetic tape T is the first data (step S6). If it is the first data, the first data is recorded in the subcode area immediately before the start of the searched music information (step S7), and then the next data is recorded at the end of the searched music information (step S8). .

If it is not the first data, it is recorded at the end position of the searched music information (step S8). In this example, music information 6
The first data is recorded at the position just before the start of music information 5, that is, at the end position of music information 5, and then the next data is recorded at the end position of music information 6.

Here, the format of the data to be recorded will be explained. The recording format is a pack/pack as shown in Figure 4.
It is a format. The pack format consists of a total of 64 bits, Pc1 to Pc8, each consisting of 8 bits.
"Pack item" of CI is data indicating the contents of pack data, and currently nine types of items are determined.

Data regarding the program number is recorded in Pc3 to Pc5. Pc3 is the step number of the program set in the program memory 24, Pc4 is the program number of the music information programmed next to the current program, and Pc5 is the music information programmed before the current program. Each program number is recorded. Pc8 is parity.

As shown in FIG. 3, the contents programmed in the program memory 24 are program numbers '6J,
Assuming there are 4 music information "3J, rl", r7, 1, the first data is Pc3=01, Pc4=06
, Pc5=BB, and is recorded in the subcode area at the end position of music information 5.

The next data is Pc3=02, Pc4=03, Pc5
=BB, and is recorded in the subcode area at the end position of music information 6. Note that data BB means program start.

When recording to the subcode area is completed (step S7.
S8), it is determined whether the program has ended or not, step S9
), the process ends if it is the program end. If the program has not ended, the process returns to step S4. In this case,
Since the program is not yet at the end, the process returns to step S4 and the next program number "03" is set in the setting circuit 26.

Thereafter, the above-described process is repeated to record the third data at the end position of music information 3. In this case, the determination in step S6 is "NO", so the process jumps to step S8. In this way, as shown in FIG. 5, at the end position of music information 3, PC3=03, PC4=01, PC3=04 at the end position of each data and music information 1, PC
4=07, PC5=03, PC3=05, PC4=EE, PC5=01 at the end position of music information 7
Each data is recorded respectively. EE means program end.

The black area in FIG. 5 is the subcode area where the start TD indicating the start position of the music information is recorded, and the shaded area is the subcode area where the pack format shown in Part 4 is recorded. .

Next, the operation of reproducing music information according to the program number set in the program memory 24 will be explained.

First, it is determined whether a program number has been set in the program memory 24 (step Sl).

Since it has already been set, the determination is "rYes". Determining whether it is the subsequent program recording mode (step S2)
is determined to be rNoJ, and further, the determination as to whether or not the program playback mode is set (step 510) is determined to be [Yesj.

Next, the program number set in the program memory 24 is loaded into the program execution circuit 25 (step 5ll), and the first program number is set in the search program number setting circuit 26 (step 512).

The program number set in the setting circuit 26 is compared with the program number stored in the program storage circuit 22 in the comparison circuit 27, and if they do not match, the program number written in the program storage circuit 22 and the setting circuit 26 are compared.
The magnetic tape T is driven at high speed under the control of the mechanism control circuit 28 until the program number set in .

When the comparison circuit 27 detects that the two program numbers match, the mechanism control circuit 28 issues a command to the mechanism section 1 to stop high-speed driving of the magnetic tape T, and ends the search operation (step 513).

Next, the searched music information is played back, and when the program end detection circuit 23 detects the end of playback (step 5)
14), Step 51 to determine whether the program has ended or not.
5) If the program is at the end, the process is terminated; if the program is not at the end, the process returns to step 512, and the next music information is searched and reproduced in the same manner as described above.

Music information is reproduced according to the program number set in the program memory 24 in this manner.

Next, the operation of reproducing music information according to the program number recorded on the magnetic tape T by the processing of steps 83 to S9 described above will be explained.

First, the determination as to whether or not the program number has been set in the program memory 24 (step 31) is determined to be NOJ. Determining whether or not the subsequent playback is in progress (step 316) and determining whether or not the program playback mode is in progress (step 517)
are both determined to be rYes. Note that step S16
Alternatively, if the determination in S17 is "No", the process ends.

Next, subcode data is read from the subcode area of the music information being reproduced, and the music information is reproduced until back data related to the program number is detected (step S18, 519).

When the program number is read from the subcode area, it is determined whether the mode is forward playback mode (step 520). The program playback mode includes a forward playback mode in which the programs are played back in the order set in the program memory 24, and a reverse playback mode in which the playback is played in the reverse order from the set order, which are selected by the operator in advance. If forward playback mode is selected, rY
Step 5
21), if it is determined as “rNo”, the P in the pack data
Set the data of C5 in the search program number setting circuit 26 as the program number of the music information to be played next (
Step 522).

When the search for the set music information is completed (step 52
3) The searched music information is played back, and if the program ends (step 524), the process ends when the playback of the music information ends (step 525). If the program has not ended, the process returns to step 318 and subsequent steps described above. In this case, the determination in step S24 as to whether or not the program is at the end is determined based on whether the next program number is rEEJ if the forward playback mode is selected, or whether the next program number is rBBJ if the reverse playback mode is used. do.

Therefore, for example, if this mode is selected while playing music information 4, music information 4-=> 5 =+ 6→3→
For example, if this mode is selected while music information 2 is being played, music information 2 → 3 → 1 → 7 will be played back.
are played in this order. In this way, no matter where on the magnetic tape T it is played back, it can be played back in the same program order.

By the way, the track format on the magnetic tape T in R-DAT is as shown in FIG. That is, in the area for recording data of each track, an ATF area for auto-tracking is provided between a PCM area containing PCM data of music information and two subcode areas 5UBl and 5UB2.

The subcode area is divided into eight blocks,
The formant of the subcode is as shown in FIG. That is, the subcode is 5ync, the sub ID
, sub-ID parity, and sub-button, each block is written in quadruple as 2 blocks, and 5UBI and 5UB2 are written in 16 blocks in 8-fold.

Sub ID is program number I indicating the program number
DI to ID3, data ID indicating the sub ID and type of sub data, and "0000" is determined as audio use, TOCID, Sh.

rtening TD, 5tart ID,
It consists of a control ID consisting of four IDs, Pr1ority ID, and a pack ID indicating the number of packs written in the subdata.

During control rD, TOCI D is an ID indicating that this program is included in the TOC, and Short
ening ID is the ID that skips to the beginning of the next song, 5tartl D is the ID that indicates the beginning of the song,
Pr1ority ID is an ID that indicates the validity of the program number ID.

The sub data pack area has a format as shown in FIG.

In the above-mentioned embodiment, the content of the program is recorded in the subcode area at the end position of the music information.
It may be recorded in any subcode area within the same music information.

〔Effect of the invention〕

According to the present invention, even if the power to the system is turned off or the cassette is removed from the mechanism, the contents programmed by the operator are not erased, and once the program is set, any music information can be stored in any order. It can be played repeatedly.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment in which the information reproducing method according to the present invention is applied to R-DAT, Fig. 2 is a flowchart for explaining the operation of Fig. 1, and Fig. 3 shows the contents of the program memory. Figure 4 is a pack format diagram, Figure 5 is an example of recording on magnetic tape, Figure 6 is a track format diagram, Figure 7 is a subcode format diagram, and Figure 8 is a pack format diagram. , FIG. 9 is a block diagram of a conventional example. Block diagram of IJ

Claims (3)

[Claims] (1) In an information reproduction method in which a plurality of pieces of recorded information are selected from among pieces of recorded information recorded on a recording medium and reproduced in an arbitrary order, the recorded information is placed at a predetermined position of each of the selected pieces of recorded information. An information reproducing method characterized in that table of contents information including positional data of recorded information to be reproduced next is recorded, and upon reproduction, the selected recorded information is reproduced in the arbitrary order according to the table of contents information. (2) The information reproducing method according to claim 1, wherein the table of contents information includes at least position data of recorded information to be reproduced before the recorded information and position data of recorded information to be reproduced next. (3) The information reproducing system according to claim 1 or 2, wherein the position data of the recorded information is a recording number indicating the recording order of the recorded information on the recording medium.