JPH06150637A - Digital sound recording and reproducing system - Google Patents

Abstract

PURPOSE:To shorten the searching time and to make renewal of TOC information, etc., efficient by recording a tape identification code on a magnetic tape and also holding various kinds of additive information including the TOC information corresponding to this identification code in an external device. CONSTITUTION:The identification code obtained from an identification code adding circuit 11 of a sound recording and reproducing device 1 is recorded on the magnetic tape 12, and is simultaneously transmitted via an input/output circuit 13 to the external device 2. In the device 2, this identification code is received by an input/output circuit 21 and is sent to a tape identification circuit 22. In the circuit 22, a new storage area is specified in a storage device 23 corresponding to the sent identification code. The various kinds of additive information generated during the sound recording are also sent to the device 2, and these bits of information are written via a write/read circuit 24 in an area specified by the circuit 22. In addition, the TOC information generated in the device 1 can be recorded on the tape 12 as occasion demands. By this method, the TOC information, etc., can immediately be read out upon identification of the magnetic tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording / reproducing system, and more particularly to a recording / reproducing system for efficiently managing additional information for recording / reproducing control of an audio tape.

[0002]

2. Description of the Related Art As a next-generation audio device for digitally recording and reproducing audio information, DCC (Digit
Al Compact Cassette) is receiving attention. DCC
In the same manner as other digital audio devices such as CDs and DATs, various additional information such as address information and time information is recorded on the magnetic tape in addition to audio information in order to perform recording / playback control such as access control. It

As the control additional information on the tape, for example,
Marks called markers can be placed at the start position of the music, the position where the tape is reversed from the A side to the B side, the position where the recording is finally finished, and the like. By searching the position of this marker, it is possible to find the beginning of a song or record a joint.
In addition to these markers, the elapsed time from the start position of the tape can be continuously recorded on the tape.
As with the CD, if the TOC table that represents the types and positions of the above-mentioned markers by the elapsed time from the tape start position is recorded at the beginning of the tape, the TOC table is referred to and scattered on the tape. The positions and types of all the markers to be used can be grasped collectively.

[0004]

However, the above-mentioned TO
For example, when additional recording is to be performed immediately after the already recorded area of the tape using the C table, first, the tape position such as rewinding or fast-forwarding to the TOC table position is performed to search the marker position on the tape. It takes time because it is necessary. Since a track jump can be performed in a CD, such a search operation can be performed in a relatively short time, but this cannot be performed in a magnetic tape, and therefore a time loss until the original recording operation is started becomes large. . Further, even if the contents of the TOC table are changed due to additional recording or the like, a search operation up to the TOC table position and a rerecording operation of the TOC table are necessary for updating the TOC table after the recording operation is completed. Since the tape cannot be taken out until the operation is completed, the next operation cannot be started, and the entire recording operation cannot be completed, which is inefficient. Further, the TOC information as described above is usually temporarily recorded in the built-in memory of the recording / reproducing apparatus. However, since the built-in memory has a limited capacity, it is difficult to store the TOC information of a plurality of tapes, for example.

The present invention has been made in consideration of such circumstances, and enables efficient management of additional information such as TOC to shorten the search time and improve the efficiency of updating TOC information. An object is to provide a digital recording / playback system.

[0006]

A digital recording / reproducing system according to the present invention includes a recording / reproducing device for recording and reproducing digital audio information on a magnetic tape, and a recording / reproducing control of a magnetic tape connected to the recording / reproducing device. Basically, it has an external device for managing the additional information of.
The recording / reproducing apparatus includes, in addition to the circuit elements necessary for normal digital recording / reproducing, a tape identification code adding means for recording a tape identification code on a magnetic tape at predetermined intervals, and a tape added by this identification signal adding means. And an input / output unit for transmitting and receiving the identification code and the additional information to and from the external device. The external device outputs an input / output unit for transmitting / receiving the tape identification code and the additional information to / from the recording / reproducing device, and a tape identification code connected to the input / output unit and sent from the recording / reproducing device. Refer to the tape identifying means for detecting, the storage device for defining the area for each magnetic tape identified by the identifying means and storing the additional information of the magnetic tape sent from the recording and reproducing device, and the contents of this storage device. Write / read means for changing.

[0007]

According to the present invention, the additional information on the tape is managed by an external device other than the recording / reproducing device. Specifically, the recording / reproducing apparatus is provided with tape identification code adding means for recording the tape identification code on the magnetic tape at predetermined intervals,
Further, the external device is provided with a storage device for holding additional information including at least TOC information, and the TOC information and the like of each tape is stored in the storage area assigned by the tape identification code. This allows you to identify TOC by simply identifying the tape.
You can grasp information instantly. For example, by storing the end position of the previous recording, the count value of the recording end time, and the like for each tape in the external storage device, it is not necessary to perform a search operation for reading the TOC table at the beginning of the tape, and the like. Even when searching without reading the TOC table, it is not necessary to confirm the marker type. For these reasons, without performing the tape running operation,
The end position of the previous recording can be searched, and the head can be brought to the start position of the additional recording in a short time.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main configuration of a digital recording / reproducing system according to an embodiment of the present invention. As shown in the figure, the system of this embodiment comprises a recording / reproducing device 1 and an external device 2 connected to the recording / reproducing device 1. The external device 2 includes
The display 3 and the data input device 4 are connected as necessary. The input device 4 is a keyboard, a mouse or the like.

In the recording / reproducing apparatus 1, all circuit elements necessary for normal digital recording / reproducing are omitted in the figure. In addition to the usual circuit elements, as shown in the figure, a tape identification code is predetermined for the magnetic tape 12 to be used, in addition to additional information such as address information and time information used to control normal recording and reproduction. A tape identification code adding circuit 11 is provided for recording at intervals. Further, the recording / reproducing apparatus 1 is provided with an input / output circuit 13 for transmitting / receiving the additional information on the tape 12 and the identification code obtained from the tape identification code adding circuit 11 to / from the external apparatus 2.

The external device 2 includes an input / output circuit 21 for transmitting / receiving data to / from the recording / playback device 1, a tape identification circuit 22 for detecting a tape identification code sent from the recording / playback device 1, and a tape 12. A storage device 23 for storing the additional information of is provided. The storage device 23 includes the identification circuit 2
The additional information including at least the TOC information of the tape is stored in the area allocated for each tape identified in 2. The writing / reading circuit 24 writes and reads data in the storage device 23, and the recording / playback control circuit 25 controls the input / output circuit 21 and the writing / reading circuit 24.

A display 3 and a data input device 4 are connected to the external device 2 as shown in the figure. The input device 4 is a keyboard, a mouse or the like. A personal computer, for example, can be used as the external device 2 including the display 3 and the input device 4. FIG. 2 specifically shows a state in which the recording / reproducing apparatus 1 and the personal computer 5 are connected.

The operation of the system thus configured will be specifically described below. First, when newly recording on a magnetic tape, the identification code adding circuit 11 generates a tape identification code at the start of recording and records it on the tape at predetermined intervals. Specifically, it may be recorded at a predetermined interval in an area in which information such as the elapsed time other than the audio information on the tape and markers can be recorded. By thus recording the identification code at a plurality of positions on the tape, the tape can be identified in a short time regardless of the position of the head.

The identification code obtained from the identification code adding circuit 11 of the recording / reproducing apparatus 1 is recorded on the tape 12 and, at the same time, transmitted to the external device 2 via the input / output circuit 13.
In the external device 2, the input / output circuit 21 receives this and sends it to the tape identification circuit 22. The identification circuit 22 includes a storage device 23.
Of the TO, which corresponds to the address area of the storage device 23 corresponding to the transmitted identification code.
After confirming that there is no C information or the like, a new storage area is designated.

Various additional information generated during recording is similarly sent to the external device 2, and the information is written in the area designated by the identification circuit 22 via the writing / reading circuit 24. The TOC created in the recording / playback device 1
The information may be recorded on the tape 12 as needed. T
If the OC information is recorded on the tape, the recording / playback device 1
Normal recording / playback control can be performed independently, that is, in a state where the external device 2 is not connected. During recording, the additional information including the TOC information and the tape identification code are recorded on the tape by the recording / reproducing apparatus 1 alone, and then these are read again from the tape and sent to the external device 2 and used in the storage device 23 as they are or as they are. It is also possible to adopt a method in which it is processed into a shape that is easy to handle and stored.

The main TOC information is the type and position of the marker. In addition to these, for example, in the case of DCC, the time count value becomes important TOC information. That is, in the DCC, the relationship between the frame, which is the unit of data, and time is 64
sec = 375 frames, and 1 sec is about 6 frames. However, since it is not exactly 1 sec = 6 frames, it is necessary to irregularly count the frames in order to keep the time accurately. Specifically, 1 sec =
When the count of 6 frames is sometimes mixed with the count of 1 sec = 5 frames, the final count is 64.
It is necessary to adjust so that sec = 375 frames. That is, in the DCC, the error becomes zero in the time count of 64 seconds, but the error is included in the middle. Therefore, in this embodiment, it is preferable to add, together with the TOC information, information as to what second of the 64 sec cycle the previous recording end time corresponds to.

When the recorded tape is applied next, the recording / reproducing apparatus 1 first reads the identification code from the tape 12 and sends it to the external apparatus 2. As a result, the external device 2 reads the TOC information or the like of the corresponding tape from the storage device 23 and sends it to the recording / playback device 1.
In this way, the recording / reproducing apparatus 1 does not require a wasteful waiting time for reading the TOC information while traveling to the beginning of the tape,
It is possible to quickly know the last recording end position, etc., and it is possible to quickly make additional recordings. Especially in the case of DCC, if the above-mentioned time count value, that is, the number of seconds in the 64 sec cycle of the previous recording end time is also stored, accurate joint recording can be performed without error. it can.

When the TOC information or the like is changed due to additional recording or the like, the storage content of the area of the storage device 23 designated by the identification code of the tape is changed by the identification code and TOC information transferred from the recording / reproducing apparatus 1. The TOC information is updated by rewriting. Further, updating of TOC information and the like can be arbitrarily performed on the external device 2 side by using the display 3 and the input device 4 independently of the recording / reproducing device 1.

[0018]

As described above, according to the present invention,
While recording the tape identification code on the tape at predetermined intervals,
At least the TOC of the tape corresponding to this identification code
By holding various additional information including information in the storage device in the external device, the TOC information or the like can be immediately read out by identifying the tape, and the search time for joint recording can be shortened. Further, management of TOC information and the like can be performed independently of the tape and the recording / reproducing apparatus, and recording on the tape is not always necessary, so management of TOC information update and the like can be efficiently performed. Furthermore, since an external storage device is used to manage TOC information, a large storage capacity can be secured,
It is possible to collectively hold and manage various additional information including TOC information of a plurality of tapes.

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration according to an embodiment of the present invention.

FIG. 2 is a diagram showing an external appearance of a system when a personal computer is used as an external device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording / reproducing apparatus, 11 ... Tape identification code addition circuit, 1
2 ... Magnetic tape, 13 ... Input / output circuit, 2 ... External device, 2
DESCRIPTION OF SYMBOLS 1 ... Input / output device, 22 ... Tape identification circuit, 23 ... Storage device, 24 ... Write / read circuit, 25 ... Recording / playback control circuit, 3 ... Display, 4 ... Data input device.

Claims (1)

[Claims] 1. A recording / reproducing device for recording and reproducing digital audio information on a magnetic tape, and an external device connected to this recording / reproducing device for managing additional information for controlling recording / reproduction of a magnetic tape, The recording / reproducing apparatus includes a tape identification code adding means for recording a tape identification code on a magnetic tape at predetermined intervals, and a tape identification code added by the identification code adding means and the additional information between the external device. And an input / output unit for transmitting / receiving the additional information and the tape identification code to / from the recording / reproducing apparatus, and the external device is connected to the input / output unit. A tape identifying means for detecting the tape identification code of the magnetic tape sent from the recording / reproducing apparatus, and an area is defined for each magnetic tape identified by the identifying means. Digital recording and reproducing system comprising a storage device for storing the additional information of the magnetic tape transmitted from the sound reproducing apparatus, further comprising a read / write means for reference or change the contents of the storage device.