JP2541121Y2 - Rotating head type digital tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a digital tape recorder for recording and reproducing digital signals on a magnetic tape, and more particularly to a rotary head type digital tape recorder using a rotary head.

[Outline of the invention]

The present invention relates to a rotary head type digital tape recorder that adds subcode data to an input digital signal and records it on an oblique recording track on a magnetic tape. Recorded as a part of, and control the high-speed running of the tape in response to the identification signal search command input, and stop the tape running when the start identification signal is detected, so that the beginning of the program can be automatically started, It is another object of the present invention to provide a rotary head type digital tape recorder capable of storing a digital signal in the vicinity of a start identification signal and reading out this data so that the program can be started instantaneously.

[Conventional technology]

For example, in the case of performing a head search at the time of reproduction on a conventional analog tape recorder (for example, a so-called open reel tape recorder or the like), generally, a magnetic tape between programs (for example, between songs at the time of recording an audio signal) is cut off. Then, a tin foil or a white tape or the like is stuck to the cut portion and connected to each other, and the tin foil or the like is detected to perform heading.

On the other hand, a rotary head type digital tape recorder, for example, performs a so-called helical scan in which a digital audio signal is obliquely recorded on a magnetic tape using a rotary head, and the audio signal is read out from the oblique recording track and reproduced. In a head using a rotary head type digital audio tape recorder (R-DAT), a method different from the head used in the analog tape recorder is adopted. That is, in the R-DAT, if a heading method similar to that of the analog tape recorder is used, muting occurs at a connection point of the magnetic tape, and it takes too much time to recover the muting. For this reason, various heading methods using the R-DAT are conceivable, and as an example, a locate function using a counter or a time code is conceivable. However, sufficient accuracy cannot be obtained by the method using the counter. Further, in the method using the time code, the time code must be recorded, and even if the time code is recorded, the time code at the head of the program must be always stored and managed, which is complicated and expensive. It is not advantageous to become a system.

For this reason, at the time of heading with the above R-DAT, the start ID is recorded in the subcode area on the recording track defined in the unified format of the R-DAT,
By searching for this, the program is started. That is, in general, in the magnetic tape of the R-DAT, as shown in FIG. 5, a plurality of oblique recording tracks 11 are provided on the magnetic tape 10 (only one recording track is shown in FIG. 5 for simplification). )It is formed. The recording track 11 is roughly divided into a main area ME where a digital audio signal is recorded and a subcode area SE. The subcode area SE is an area in which various data accompanying the digital audio signal, for example, subcode data such as a sampling frequency, the number of channels, a program number, and time information are recorded. The start ID and the like are also recorded. I can do it. here,
The start ID can be recorded for 9 seconds at the beginning of each program, and a start ID indicating each program is recorded, for example, at the time of recording each program (or recorded for each program after recording an audio signal). By detecting the start ID of a program that is required at the time of playback, the head of the program can be found.
When a high-speed search is performed during playback and the start ID is detected, playback starts from there, and the beginning of the program can be started.

[Problems to be solved by the invention]

However, the above-mentioned program heading function has the following problem when the R-DAT is used for professional use in a broadcasting station or the like. For example, when a start ID is detected during a high-speed search, the mode is automatically switched to the reproduction mode, so that the reproduction of the program is immediately started, and a sound may be produced immediately. For this reason, for example, when the start of the program by the search for the start ID is performed as described above at the time of on-air at a broadcasting station or the like, a sound may be inadvertently output. That is, for example, when a story such as a comment is inserted between songs during air-on, a sound of the next song is produced at the time of the comment.

Further, in the conventional R-DAT as described above, for example, a reproduction switch is turned on due to a limitation on a mechanism of a device or the like, for example, a limitation on a mechanism until a rotation speed of a rotary head reaches a predetermined rotation speed. It takes about 0.7 to 1.0 sec from the start to the start of the program, which is longer than the program start time (0.1 to 0.3 sec) of the analog tape recorder. The fact that the time until program start is later than that of an analog tape recorder (the instant start of playback is not possible) is still an issue with R-DA
T is a drawback in use.

Therefore, the present invention has been proposed in view of the above-mentioned situation, and it is intended to make it possible to automatically start a program and prevent a sound from being inadvertently generated at the time of heading. It is another object of the present invention to provide a rotary head type digital tape recorder capable of instantaneously starting program playback.

[Means for solving the problem]

The rotary head type digital tape recorder of the present invention
In order to achieve the above-mentioned object, a digital signal to which sub-code data has been added is used in a rotary head type digital tape recorder for reproducing a magnetic tape recorded as an oblique recording track. Detecting means for detecting a start identification signal recorded as a part of the magnetic tape, controlling the high-speed running of the magnetic tape in response to an input of an identification signal search command, and detecting the start identification signal by the detecting means. Control means for stopping the running of the tape, and a memory for storing the digital signal in the vicinity of the start identification signal, when a playback command is input, read the digital signal stored in the memory, The playback is started instantly.

[Action]

According to the present invention, when the start identification signal is detected, the tape running is stopped so that the program is not reproduced, so that the beginning of the program is not inadvertently reproduced. The memory can be read out instantaneously, and when a start identification signal is detected and the tape running is stopped, a digital signal near the start identification signal is stored in this memory so that a playback command can be input later. When done
If a digital signal near the start identification signal stored in the memory is read, instantaneous start can be performed.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a functional block diagram of a digital audio tape recorder (R-DAT) as an embodiment of the rotary head type digital tape recorder of the present invention.

The tape recorder of the present embodiment shown in FIG. 1 is, for example, a rotary head type digital audio tape recorder which adds subcode data to an input digital audio signal and records it as a diagonal recording track on a magnetic tape 10 by a rotary head 23. (R-DAT) as means for recording a start identification signal (start ID) as a part of the subcode data on the diagonal recording track at the beginning of a program (for example, a song) of the input digital audio signal. The high-speed running control of the magnetic tape 10 is performed according to the identification signal search command input sent from the recording / playback function block 20 and the command sending function block 29, and the ID
A system control function block 28 and a tape running system function block as means for stopping the running of the magnetic tape 10 when the start ID is detected by the detection function block 26
22.

That is, in the R-DAT of this embodiment, as shown in FIG. 2, when the audio signal is recorded on the oblique recording track 11, the sub-code data is added to the audio signal to record on the oblique recording track 11. Is recorded in the subcode area SE. The audio signal is recorded in the main area ME. At this time, in the leading portion, that is, the recording range (e.g. in the drawing range of tracks to the _s-th to E _sm th E) of the head portion of the program recording range P S _ID of the program (music) of the audio signal, the subcode data The start ID is recorded as a part of the start ID. The start ID recording range S _ID can be recorded for 9 seconds in the R-DAT format. The subcode data and the audio signal are recorded on the recording track 11 of the magnetic tape 10 by the recording / reproducing function block 20.

As described above, when reproducing the magnetic tape 10 having the start ID recorded at the beginning of each program, there is a case where it is desired to start the program as described above. In such a case, the start ID is recorded at the beginning of each program in advance. Then, the operator of the R-DAT selects a command for heading the program. When the start command of the program is selected, the identification signal search command (start ID search command) which is a command for the start of the program is output from the command transmission function block 29. The start ID search command is sent to the system control function block 28. The system control function block 28 controls the running speed of the magnetic tape 10 in the tape running system function block 22 to be high-speed running in response to the input of the start ID search command. As a result, a high-speed search state is set. The signal obtained from the rotary head 23 during such a high-speed search is
It is sent to the ID detection function block 26. The ID detection function block 26 starts the above-mentioned start from the signal of the rotary head 23.
An ID signal is detected, and this detection output is transmitted to the system control function block 28. In the system control function block 28, at the time when the start ID detection output is supplied, the tape running system function block 22 is controlled again to stop the running of the magnetic tape 10 so as to be in the reproduction standby state. I do. Here, when the playback standby state is set,
To correct excessive advance of the magnetic tape 10 by the high-speed search, after the magnetic tape 10 is once rolled back,
The reproduction standby state is set at the beginning of the program.

That is, as shown in FIG. 3 (a), on the magnetic tape, the r.
Number of programs P ₁ ~P _r has not been recorded, for example If this program P _1, such as want to head out, the high-speed search C is started at the start ID search command, of FIG. 3 (b) It is reproduced standby state detection point B ₁ of the start ID programs P ₁ as shown in FIG. Similarly, if you want to head out of the program P ₂ is, the program
Is a reproduction standby state at the detection time point B ₂ of the start ID of P _2, if you want to head out of the program P _r is a reproduction standby state at the detection time point B _r of the start ID of the program P _r.

As described above, in the R-DAT of the present embodiment, even if the start ID is detected during the high-speed search and the program is automatically searched, the program does not immediately shift to the program playback state, and the playback standby state is set. For example, no sound is inadvertently output at the time of on-air at a broadcasting station or the like. Also,
Automatic heading is possible even without time information such as time code.

By the way, in the R-DAT of this embodiment, a so-called skip operation which is used when it is desired to skip between programs can be performed. That is, for example, when the reproduction of a certain program ends, an operation of jumping to the beginning of the next program is possible. here,
In the conventional R-DAT, it was possible to perform a skip operation.However, in the skip of the conventional R-DAT, the skip to the next program was performed and immediately when the beginning of the next program was detected, It was like starting playback of a program. For this reason, there is a possibility that the sound may be inadvertently generated when the broadcast station or the like is on the air, as in the case described above. For example, when it is desired to enter a commentary or the like between music pieces during the on-air, there is a risk that the sound of the next music piece will be output at the time of this commentary.

On the other hand, in the R-DAT of the present embodiment, when skipping and detecting the beginning of the next program, the reproduction standby state is set in the same manner as described above. There is no. That is, in order to perform the skip operation, first, a skip ID is recorded in the subcode area SE on the recording track 11 as a part of the subcode data, as in the case of the above-described heading. However,
The skip ID, unlike the start ID, is recorded for one second when the program ends.
Therefore, if a skip operation is desired, the R-DAT operator selects a skip operation command when reproducing the magnetic tape 10 on which the skip ID is recorded after the end of each program as described above. . When the skip command is selected, the skip ID command is sent from the command transmission function block 29 to the system control function block 28. The skip
The system control function block 28 to which the ID command is supplied is a rotating head.
When the output indicating that the skip ID is detected is supplied from the signal 23, the tape running in the tape running system function block 22 is controlled so as to be in the high-speed search mode. Thereafter, when the ID detection function block 26 detects the signal of the start ID from the signal of the rotary head 23, the system control function block 28 controls the tape traveling system function block 22 again to control the magnetic tape.
Stop the running of 10 so as to enter the playback standby state. That is, in the conventional R-DAT skip ID command, if the skip ID is detected, the start ID of the next program head is detected and the reproduction is started immediately. In DAT, skip ID
Is detected, the skip ID command is converted to the start ID search command, and the start ID search command performs the same processing as the above-described program start.

By performing such a skip operation, for example, the third
As shown in (c) of FIG, when the program P ₁ is completed (skip ID detection point D), and shifts to high speed searching state, it becomes a reproduction standby state at the start ID detecting point B ₂ of the following program P ₂ , program P ₁ and program P ₂ between K
Is skipped.

As described above, in the R-DAT of the present embodiment, even if a skip operation is performed and the program jumps to the beginning of the next program, the state does not immediately shift to the playback state of the next program,
Since the reproduction standby state is set, there is no possibility that sound is inadvertently produced at the time of on-air at a broadcasting station or the like as described above. Further, for example, sequential automatic program transmission is also possible by performing external control.

In the R-DAT of this embodiment, the end ID can be detected as subcode data similar to the start ID and the skip ID. That is, this end ID is
As shown in (d) of the drawing, the data is recorded for one second in the subcode area SE of the recording track after all the programs have been completed. At the time N when this end ID is detected, for example, the system control The function block 28 can stop the tape running system function block 22 and end the reproduction by the rotary head 23. Further, for example, two R-DATs of the present embodiment are prepared, and the end ID detection output of one R-DAT is tally-output to a so-called remote interface with the other R-DAT, thereby outputting the other R-DAT. It is also possible to start automatic heading with R-DAT.

Here, using the R-DAT of the present embodiment in a broadcast station or the like, for example, when the program ID is in the program playback standby state by the above-described start ID detection, the program is started immediately by turning on the playback switch. Need to be done. Therefore, the R-DAT of the embodiment of the present invention
Has a memory 27 for storing a digital audio signal near the signal of the start ID, that is, an audio signal from a recording track near the recording track on which the start ID is recorded, and stores the digital audio signal in the memory 27 at the time of start. By reading it out, the program can be started instantaneously.

That is, the signal from each recording track from the rotary head 23 is supplied to the memory 27 of the R-DAT of the present embodiment. At this time, the memory 27 As shown, the start ID of the magnetic tape 10 is
It is possible to store a reproduction signal such as an audio signal (including subcode data) recorded on a recording track near the recording range S _ID (for example, each track in the E _{1 to} En _n recording ranges M in the figure). I can do it. Memory 27 above
The internal configuration of is, for example, as shown in FIG.
The above start ID recording range S _ID from the E _{1 to the} E _n th in the figure
Recording tracks 11 in the vicinity of such each signal read from (the recording track of the recording range M) is, for example, stored is the address divided for each recording track in each storage area (address e ₁ to e _n) Has become.

Therefore, in the R-DAT of this embodiment, when the start ID is detected in the high-speed search (high-speed search based on the start ID search command), the reproduction first enters the program standby state as described above. . As described above, at the time of the reproduction standby state after the detection of the start ID, the start ID recording range S _ID is stored in the memory 27.
Are stored in each recording track (the recording range M) in the vicinity of. At this time, when the playback switch is turned on, the command transmission function block
From 29, a playback command is output and sent to the system control function block 28. The system control function block 28 starts reading data stored in the memory 27 based on the reproduction command, and outputs the read data from the output terminal 30 as a reproduction signal. However, this memory 27
The read start address in the top ie start ID recording area S _ID head of Figure 2 during a read from the data storage area of the address e _s the data of _s-th recording track E is stored in is started programs . Then, read out sequentially read data to the address e _n. Also,
During this time, the above address e _s (the data of the E _s- th track)
The address e ₁ ~e _s-1 data is written in the previous recording track, for example, overwriting (or rewriting after erase) is, E _n-th next E _{n + 1} th, E _{n + second,} the data of each recording track ...... is adapted to gradually written sequentially. Therefore, after the data at the address e _n is read, the data at the addresses e _{1 to} e _s−1 are sequentially read. Further, while the data at the addresses e _{1 to} e _s-1 are sequentially read, the addresses e _s to
So that the data of the new recording track is written to address e _n. In this way, by sequentially performing writing / reading, program data is reproduced without interruption.

From the above, in the R-DAT of this embodiment, the reproduction start from the program reproduction standby state by the start ID detection can be instantaneously performed, and the subsequent program reproduction can be smoothly performed. Also, as described above, by using two R-DATs of the present embodiment, by outputting the end ID detection output of one R-DAT to a remote interface with the other R-DAT, by tally output, Instant start is also possible with the other R-DAT.

[Effect of the invention]

In the rotary head type digital tape recorder of the present invention, at the beginning of the program, the start identification signal is recorded as a part of the subcode data on the oblique recording track, and the tape is controlled at high speed according to the input of the identification signal search command. By stopping the tape running when the start identification signal is detected, it is possible to automatically start the program, and to prevent the careless playback of the program (playback of the careless sound). .

The memory can be read out instantaneously, and when a start identification signal is detected and the tape running is stopped, a digital signal near the start identification signal is stored in this memory so that a playback command can be input later. Then, by reading a digital signal near the start identification signal stored in the memory, instantaneous start can be performed.

That is, in a rotary head type digital tape recorder that detects magnetic data by moving a rotary head and a magnetic tape relatively, generally, it takes time from input of a playback command to playback, but the rotary head type digital tape recorder of the present invention. In a tape recorder, when a start identification signal is detected, a mechanical cue is performed by a tape running system, and a digital signal near the start identification signal is reproduced from a magnetic tape using an electrical memory. When a playback command is input, the digital signal stored in the memory is read out, and a digital signal played back from a magnetic tape is connected to the read digital signal, so that playback is started from the input of the playback command. Will start running faster,
The part that you want to play can be reliably played back at the moment you want to play it.

As described above, according to the rotary head type digital tape recorder of the present invention, the load on the tape traveling system can be reduced, and a fast and reliable reproduction operation can be performed.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a schematic configuration of the R-DAT of the embodiment of the present invention, FIG. 2 is a diagram showing a magnetic tape on which signals are recorded by the R-DAT of the embodiment, and FIG. FIG. 4 is a diagram for explaining a relationship with an ID signal, FIG. 4 is a diagram showing an internal configuration of a memory, and FIG. 5 is a diagram for explaining recording tracks recorded on a magnetic tape by R-DAT. 10 Magnetic tape 20 Recording and playback function block 22 Tape running system function block 23 Rotating head 26 ID detection function block 27 Memory 28 System control function block 29 Command transmission function block

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-133386 (JP, A) JP-A-62-298986 (JP, A) JP-A-53-125806 (JP, A) JP-A-58-1983 97174 (JP, A) JP-A 1-285086 (JP, A) JP-A 3-120652 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] A rotary head type digital tape recorder for reproducing a magnetic tape on which a digital signal to which subcode data has been added is recorded as an oblique recording track, wherein a start identification signal recorded as part of the subcode data is provided. Control means for controlling the high-speed running of the magnetic tape in response to the input of the identification signal search command, and for stopping the running of the magnetic tape when the detecting means detects the start identification signal. A memory for storing the digital signal in the vicinity of the start identification signal, wherein when a reproduction command is input, the digital signal stored in the memory is read and reproduction is started instantaneously. A rotary head type digital tape recorder characterized by the following.