JPH07118183B2 - Digital audio tape recorder - Google Patents

Description

The present invention relates to a rotary head type digital audio tape recorder, a so-called R-DAT, and more specifically, it is recorded in a subcode area of a leading program during renumbering operation. Table of contents (TOC) information related to R-DAT automatically erased.

[Conventional technology]

As is well known, rotary head digital audio
A tape recorder (hereinafter referred to as DAT) has a renumber function that rewrites a program number (PNO) that has been duplicated, complicated, or missing as a continuous number.

Figure 3 shows the structure of the DAT. In the figure, 1 is a mechanism block for rotationally driving a magnetic tape 2, 3 is a rotary drum for helical scanning, 4a and 4b are recording / reproducing magnetic heads attached to the rotary drum 3, and 5 is a pinch roller. , 6 is a capstan, 7 is a supply reel, and 8 is a take-up reel 8.

Further, 9 is a magnetic head 4 corresponding to the rotation of the rotary drum 3.
A head selector switch for switching between a and 4b, 10 a recording / reproducing switch for switching a recording mode / reproducing mode, 11 a reproducing amplifier, 12 a recording amplifier, 13 a variety of circuits such as an encoder and a decoder. Signal processing circuit, including
14 is an A / D converter, 15 is a D / A converter, 16 is a system controller including a microcomputer that controls the operation of the entire device, and 17 is for externally issuing various operation instructions to the system controller 16. Input device, 18
Is a display device for displaying the operating state of the device.

Next, a conventional renumbering operation in the DAT having the above configuration will be described with reference to the flowchart of FIG. 4 and the operation explanatory diagram of FIG.

As shown in FIG. 5A, the original program A to the magnetic tape 2 to be renumbered is used.
From the middle of the tape where E was recorded, another program G,
It is assumed that H and I are overwritten and the program number (PNO) of the subcode area of each program is recorded in an overlapping state as shown in FIG. 5 (a).

Now, in order to renumber the magnetic tape in the PNO recording state as described above, when a renumbering command is given from the input device 17, the system controller 16 first controls the mechanism block 1 to tape the magnetic tape 2 to the tape. Rewind to the starting end (BOT) (step S41 in FIG. 4). This time,
Reset the count value of the PNO counter (not shown) in the system controller 16 to "00" (step
S42).

Next, the system controller 16 controls the mechanism block 1 to enter the search running mode, and searches for the beginning of each program by searching the start ID (ST-ID) recorded at the beginning of each program. (Step S43).

When the system controller 16 detects the first program (steps S44, S45), it increments the count value of the PNO counter by 1 (step S46), compares this count value with the PNO of the searched current program, If they are equal, the process returns to step S42 to immediately start the search for the next program (step S47). This is for skipping the search for the correct PNO program and shortening the time required for the renumbering operation.

If the count value and the PNO are different, the process proceeds to step S48, and the count value of the counter is output to the signal processing circuit 13 as the PNO of the music (step S4
8) The signal processing circuit 13 is set to the after-recording operation mode, and the PNO and ST-ID of the program are rewritten for a prescribed 9 seconds (steps S49, S50, S51).

After performing the rewriting operation of the PNO and ST-ID for a prescribed period of 9 seconds (step S51), the system controller 16 performs signal processing of "0AA" indicating an invalid PNO in order to prevent the PNO of the previous program from being left unerased. Send to circuit 13 (step S52),
"0AA" indicating the invalid PNO is subsequently recorded for 2 seconds (steps S53, S54, S55).

Then, the above renumbering operation is repeatedly executed for each program from the tape start end (BOT) to the tape end (EOT) as shown in FIG. 5 (c) (step S44,
S56).

In this way, the renumbering operation is the tape end (EOT)
When completed, all PNOs from the tape start end to the tape end end are "01" to "0" as shown in FIG. 5 (b).
It is rewritten as a serial number according to the recording order of the program like 5 ”.

[Problems to be Solved by the Invention]

However, in the case of the conventional renumbering described above, if the PNO of the program to be rewritten and the value of the PNO to be rewritten match in order to shorten the renumbering operation time, an interlaced search is performed and the rewriting operation is performed. I was trying not to do it. Therefore, the leading program
When renumbering a tape with TOC information recorded on ST-ID at the same time, the leading program is skipped and the TOC information remains as it is without being erased. It does not match the program contents.

Therefore, the DA with the conventional renumbering function described above
When using T, there was a problem that problems would occur when a program was searched using TOC information.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and in the renumbering operation, the first program recorded at the beginning of the tape is recorded.
The purpose is to automatically delete TOC information and prevent problems caused by meaningless TOC information remaining after renumbering.

[Outline of Invention]

In order to achieve the above object, the present invention records TOC information regarding all programs recorded in the subcode area of the first program recorded first on the magnetic tape, and the TOC information is first recorded on the magnetic tape during the renumbering operation. The head program detection means for detecting the head program recorded in
When C information is recorded, the head program is renumbered and the recorded TOC information is erased.

〔Example〕

An embodiment of the present invention will be described below with reference to the flowchart of FIG. 1 and the operation explanatory diagram of FIG.

In order to realize the renumbering operation according to the present invention, a head program detecting means for detecting the head program recorded first on the magnetic tape during the renumbering operation is required. The function is usually realized by software by a microcomputer that constitutes the system controller 16. Therefore, since the hardware configuration of the DAT itself is the same as that shown in FIG. 3, the DAT shown in FIG. 3 will be used as the hardware configuration in the following description.

The renumbering operation in the embodiment of the present invention is basically the same as the conventional one described in FIG. 4, and the different point is that the subcode area of the leading program is different, as will be apparent from the operation description given later. The point is that when the TOC information on all programs is recorded, the number of the top program is re-numbered and the recorded TOC information is erased.

The operation of the embodiment of the present invention will be described below.

Now, in order to renumber the magnetic tape in the PNO recording state as shown in FIG. 2 (a) because the programs G, H, and I have been dubbed, the renumbering command is given from the input device 17, The system controller 16 first controls the mechanism block 1 to rewind the magnetic tape 2 to the tape start end (BOT) (step S1 in FIG. 1). This time,
Reset the count value of the PNO counter (not shown) in the system controller 16 to "00" (step
S2).

Next, the system controller 16 controls the mechanism block 1 to enter the search running mode, and searches for the beginning of each program by searching the start ID (ST-ID) recorded at the beginning of each program. (Step S3).

When the system controller 16 detects the program (steps S4 and S5), it increments the count value of the PNO counter by 1 (step S46).

Then, it is determined whether or not the count value is “01”, that is, whether or not the detection program is the first program recorded on the tape (step S7). The process branches to step S9, the renumbering operation after step S9 described later is executed, and the PNO of the leading program is rewritten. This rewrite is
It is always executed as long as it is the first program regardless of the PNO status of the first program. This PNO rewriting automatically erases the TOC information written in the first program.

In step S7, the count value of the counter is "01"
If not, that is, if the detected program is not the first program, the process proceeds to step S8, and the count value of the counter at that time is compared with the PNO of the searched current program.

In step S8, if the count value is equal to PNO, the process returns to step S3 to immediately start the search for the next program. This is to shorten the time required for the renumbering operation by performing the interlaced search for the program that does not need to change the PNO.

On the other hand, in step S8, if the count value of the counter and the PNO of the program are different, the process proceeds to step S8.
Move to 9 and change the count value of the above counter to the PNO of the song.
Is output to the signal processing circuit 13 as a post-recording operation mode, and the PNO and ST-ID of the program are rewritten for a prescribed 9 seconds (steps S10, S11, S12).

After performing the rewriting operation of the PNO and ST-ID for a prescribed period of 9 seconds (step S12), the system controller 16 performs signal processing of "0AA" indicating an invalid PNO in order to prevent the PNO of the previous program from being left unerased. Send to circuit 13 (step S13),
"0AA" indicating the invalid PNO is subsequently recorded for 2 seconds (steps S14, S15, S16).

Then, the above renumbering operation is repeatedly executed for each program from the tape start end (BOT) to the tape end (EOT) as shown in FIG. 2C (steps S4, S).
Five).

In this way, the renumbering operation is the tape end (EOT)
Upon completion, all the PNOs from the tape start end to the tape end end are "01" to "0" as shown in FIG. 2 (b).
As shown in 5 ”, the TOC information recorded in the subcode area of the first program recorded on the magnetic tape is automatically erased while being rewritten as a serial number according to the recording order of the program.

In the above embodiment, the PNO of the head program is rewritten without fail.
If the information is not recorded, the interlaced search may be performed.

〔The invention's effect〕

According to the present invention, at the time of renumbering, when the table of contents (TOC) information is recorded in the subcode area of the head program, the head program is renumbered and the recorded table of contents (TOC) information is recorded. Since it is automatically erased, the search operation based on the wrong TOC information (which does not match the program actually recorded on the tape) is not performed, and the occurrence of trouble can be prevented in advance. .

Furthermore, since the TOC information is automatically erased during the renumbering operation, there is no need to provide a mechanism or device such as a special operation button for erasing the TOC information, and the cost can be reduced. In addition, since the operation is simple, it is possible to prevent a user's erroneous operation.

[Brief description of drawings]

FIG. 1 is a flowchart of the renumbering operation according to the present invention, FIG. 2 is an explanatory diagram of the renumbering operation of the same as above, and FIG.
FIG. 4 is a block diagram showing the configuration of the tape recorder, FIG. 4 is a flowchart of a conventional renumbering operation, and FIG. 5 is an explanatory diagram of the conventional renumbering operation. 2 ... magnetic tape, 13 ... signal processing circuit, 16 ... system controller, TOC ... table of contents, PNO ... program number.

Claims (1)

[Claims] 1. A magnetic tape having a TOC information about all programs recorded in a subcode area of the first program recorded on the magnetic tape is searched for a recording program from the tape start end to the tape end. Program numbers not aligned (PNO)
In a rotary head type digital audio tape recorder having a renumbering function for rewriting only the head, a head program detecting means for detecting a head program recorded first on a magnetic tape at the time of renumbering operation; When the table of contents (TOC) information is recorded in the subcode area of the head program detected by the program detecting means, the erasing means for renumbering the head program and deleting the recorded table of contents (TOC) information , A digital audio tape recorder characterized by including.