JPH0719404B2 - Digital audio tape recorder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotary head type digital audio tape recorder, so-called R-DAT, and more specifically, an erroneous erasure prevention knob of a cassette half is set to a recordable state. If it is, it relates to a DAT that rewinds a certain amount of magnetic tape when the cassette is loaded.

[Conventional technology]

A rotary head type digital audio tape recorder (hereinafter referred to as DAT) automatically plays a magnetic tape for a fixed time when a cassette is loaded for recording / playback, and the TOC recorded on the magnetic tape. It is configured to read subcode information such as (table of contents).

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

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.

The reproduction traveling operation at the time of loading the cassette in the conventional DAT having the above configuration will be described with reference to the operation explanatory view of FIG.

When the mechanism block 1 is loaded with the cassette, the system controller 16 sets the signal processing circuit 13 in the reproduction mode and records the mechanism block 1 on the magnetic tape 2 in the reproduction running state as shown in FIG. The sub-code information such as the TOC (table of contents) being read is started, and the reproduction traveling is stopped after the elapse of a predetermined time t. In this way, the subcode information recorded on the magnetic tape is checked by automatically reading the subcode information on the magnetic tape when the cassette is loaded, and further, based on the read subcode information. This is to enable smooth searches.

[Problems to be Solved by the Invention]

The conventional DAT is a reproduction for reading the subcode information for all the loaded cassettes regardless of whether the loaded cassettes are the recording prohibited cassettes or the recordable cassettes. The driving operation was automatically executed.

Therefore, as shown in FIG. 6 (a), the cassette in the recording operation is temporarily stopped and taken out from the DAT, and the taken-out cassette is loaded into the DAT again as shown in FIG. When the recording is restarted after the recording section A, the reproduction traveling for reading the subcode information is automatically executed at the same time as the reloading of the cassette. And an unrecorded portion C corresponding to the reproduction running time t is generated, and the time code of the program recorded on the magnetic tape (absolute time: A / TIM
The continuity of E) may be lost, and noise may be generated in this unrecorded portion during reproduction.

[Object of the Invention]

The present invention has been made to solve the above problems, and an object of the present invention is to provide a DAT in which an unrecorded portion is not produced on the magnetic tape even when the above-mentioned re-recording is performed.

[Outline of Invention]

In order to achieve the above object, the present invention provides an erroneous erasure prevention knob detecting means for detecting whether or not the cassette is set to a recordable state from the opened / closed state of the erroneous erasure prevention knob of the cassette half, and And a rewinding control means for controlling the mechanism block so that the magnetic tape is rewound by a predetermined amount instead of the reproduction running when the erroneous erasure prevention knob detecting means detects that the cassette is set to the recordable state. If the cassette half's erroneous erasure prevention knob is set to recordable status, the magnetic tape is rewound by a certain amount instead of the above-mentioned playback running when the cassette is loaded. The unrecorded portion is eliminated by wrapping.

〔Example〕

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

FIG. 1 shows a block diagram of one embodiment of a DAT according to the present invention. The same components as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

The above embodiment has the same configuration as the conventional DAT, and detects the erroneous erasure prevention knob which detects whether the loaded cassette is set to the recordable state or not based on the opened / closed state of the erroneous erasure prevention knob of the cassette half. It is configured by attaching means 19. In order to realize the present invention,
In addition to the erroneous erasure prevention knob detection means 19, when the erroneous erasure prevention knob detection means 19 detects that the cassette is set to the recordable state, the conventional reproduction running is replaced and a certain amount of magnetic tape is wound. Rewinding control means for controlling the mechanism block 1 to return is required, but this function is realized by software by the microcomputer constituting the system controller 16.

Next, the operation of the above embodiment will be described with reference to the flowchart of FIG. 2 and the operation explanatory diagram of FIG.

When a cassette is loaded into the mechanism block 1 (step S1), the erroneous erasure prevention knob detecting means 19 detects the open / closed state of the erroneous erasure prevention knob of the cassette half, and the loaded cassette is set to the recording prohibited state. , Or it is set to the recordable state. When the erroneous erasure prevention knob is set to the "open" state, that is, the recording prohibition state, the process proceeds to step S6, and the magnetic tape is kept on the magnetic tape for a certain time t as in the conventional case (FIG. 5). After the sub-code information is read from (step S7), the traveling is stopped (step S8).

On the other hand, if the erroneous erasure prevention knob is set to the “closed” state, that is, the recordable state, the process proceeds to step S3, and the system controller 16 causes the mechanism lock 1
Is set to the rewinding traveling mode to start rewinding the magnetic tape, and after rewinding the magnetic tape by a certain amount as shown in FIG. 3 (step S4), the traveling is stopped (step S5). Therefore, even when the recording operation is temporarily stopped and the cassette (see FIG. 6 (a)) taken out from the DAT is reloaded and recording is restarted, as shown in FIG. It becomes possible to start the next recording by overlapping the first recording section A and the current recording section B and the current recording section B, and no unrecorded section is generated.

〔The invention's effect〕

As described above, according to the present invention, when the erroneous erasure prevention knob of the loaded cassette is set to the recordable state, only a small amount of the magnetic tape is used instead of the conventional reproduction running when the cassette is loaded. Since it was configured to rewind,
Even when the recording operation is temporarily stopped and the cassette taken out from the DAT is reloaded and recording is restarted, an unrecorded portion unlike the conventional case does not occur between the recording portion and the recording portion.
Recording can be continued while maintaining the continuity of the time code, and problems such as a search using the subcode information will not occur, and there will be no possibility of generating noise during reproduction.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flow chart of the operation of the above embodiment, FIG. 3 is an operation explanatory view of the above embodiment, and FIG. 4 is a block diagram showing a configuration of a conventional DAT. FIG. 5, FIG. 5 and FIG. 6 are diagrams for explaining the operation of the conventional example. 1 ... Mechanism block, 2 ... Magnetic tape, 13 ...
Signal processing circuit, 16 ... System controller, 19 ... Accidental erasure prevention knob detection means.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location G11B 27/28 A 8224-5D (72) Inventor Fumihiko Miyamoto 4-2610 Hanazono, Tokorozawa-shi, Saitama Paio Near Tokorozawa Plant (72) Inventor Masami Tsuchida 4-2610 Hanazono, Tokorozawa, Saitama Prefecture Pioneer Inside Tokorozawa Plant (72) Inventor Hiroshi Kawaguchi 4-2610 Hanazono, Saitama Prefecture Pioneer Tokorozawa In the factory (72) Inventor Kiyoshi Iwai 426-10 Hanazono, Tokorozawa City, Saitama Pioneer Co., Ltd. Tokorozawa Factory

Claims (1)

[Claims] 1. A rotary head type digital audio tape recorder for automatically reproducing and running a magnetic tape for a fixed time when a cassette is loaded to read subcode information recorded on the magnetic tape. , The cassette is recorded by the erroneous erasure prevention knob detection unit that detects whether the cassette is set to recordable state from the open / closed state of the erroneous erasure prevention knob of the cassette half, and the erroneous erasure prevention knob detection unit when the cassette is loaded. A digital audio system comprising rewinding control means for controlling a mechanism block so that the magnetic tape is rewound by a fixed amount in place of the reproduction running when it is detected that it is set to the enabled state. ·Tape recorder.