JP2734058B2 - Digital tape recorder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital tape recorder capable of reproducing a digitally recorded tape such as a rotary head digital audio tape recorder. (Hereinafter, a rotary head type digital audio tape recorder is referred to as an R-DAT.) In recent years, a digital tape recorder has a recording unit and a recording unit in order to maintain continuity of an absolute time indicating a time from a tape start end. It is desired to prevent a non-recording portion from being formed during the recording. For this reason, in a digital tape recorder, at the time of constant speed playback or fast forward, if the non-recorded part continues for 73.35 mm or more, it is considered that the tape has passed the accessible tape position, and it automatically stops or automatically rewinds. Things that move are realized. (For example, ZDAT Conference Standard Digital Audio Tape Recorder System THE DA
T CONFERENCE STANDARD DIGITAL AUDIO TAPERECORDER S
YSTEM: Annex 4.Application rules of Subcode for own
See recorded tape. (Hereinafter, the area on the tape that can normally be operated by the user will be referred to as the accessible area, the place that defines the rear end of the accessible area as the lead-out area, and the lead-out area will be detected and stopped automatically.) Is referred to as auto-rewind, detecting the lead-out area and automatically proceeding to the rewinding operation.
The operation of a mechanism, such as auto rewind or auto stop, that is automatically executed after detecting a lead-out area is referred to as lead-out area processing. In such a digital tape recorder, as shown in FIG. 3, there is no problem that the auto stop or the auto rewind works when the player enters the lead-out area from the accessible area by constant speed reproduction or fast forward.

Problems to be Solved by the Invention However, as shown in FIG. 4 (b), when the tape is to be run for a first time or at a fast forward speed due to dusting of the tape used for the first time, the constant speed reproduction is performed. Or 73.35mm
Each time the vehicle runs, the auto stop or the auto rewind is activated, and the intended purpose of the user cannot be achieved. Also, if the cleaning tape is played back to clean the head, the entire tape is a non-recording area, so the auto stop or auto rewind will work every time the 73.35mm is played, and the purpose of the user may be achieved. Had the problem of not being able to do so.

In view of the above problems, in the present invention, when entering the lead-out area from the accessible area at constant speed playback or fast forward, the auto stop or auto rewind works, and a non-recording portion continues from the time when constant speed playback or fast forward is started. In some cases, the present invention provides a digital audio tape recorder in which auto stop or auto rewind does not work.

Means for Solving the Problems To solve the above problems, a digital tape recorder according to the present invention comprises: a lead-out area detecting means for detecting a lead-out area at the time of constant-speed reproduction or fast-forwarding; A lead-out area processing means for instructing a mechanism to perform a lead-out process when the means detects a lead-out area; and a lead-out area processing means when the tape position at the start of constant speed reproduction or fast forward is a non-recording portion. Is provided with a lead-out area processing canceling unit that does not perform the above.

Function The present invention, according to the above configuration, for the purpose of dusting the tape and cleaning the head used for the first time, when the user tries to run the tape at a constant speed playback or fast forward from the tape position of the non-recording part, Since the lead-out area processing is not performed, the purpose intended by the user can be achieved.

Hereinafter, an R-DAT which is a digital tape recorder according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an R-DAT according to one embodiment of the present invention. In FIG. 1, 1 is a mechanism, 2 is a magnetic tape, 3 is a reproducing head mounted on a cylinder of the mechanism 1, and 4 is a reproducing amplifier. Reference numeral 5 denotes a reproduction signal processing circuit for performing error correction of a digital signal and deinterleaving for restoring a temporal arrangement, reference numeral 6 denotes a DA converter, and reference numeral 7 denotes an analog output terminal. Reference numeral 8 denotes a non-recording portion detection circuit for detecting whether the position of the magnetic tape 2 is a recording portion or a non-recording portion based on the presence or absence of an output signal of the reproducing amplifier 4. Reference numeral 9 denotes a lead-out detection unit for detecting a lead-out area from an output signal of the non-recording unit detection circuit 8, and is configured to include, for example, an internal timer for a time corresponding to a tape running 73.35 mm in length. I have. Ten
Reference numeral denotes a lead-out area processing unit that outputs a signal to the mechanism control unit 12 based on an output signal of the lead-out area detection unit 9 so that the mechanism 1 performs a lead-out area process such as auto rewind or auto stop. Reference numeral 11 denotes a case where the output signal of the operation unit 14 is a constant speed reproduction or a fast forward. This is a lead-out area processing cancel unit that outputs a signal to the mechanism 12 so as not to be executed. Reference numeral 12 denotes a mechanism control unit that controls the mechanism 1 based on output signals from the operation unit 14 and output signals from the lead-out area processing unit 10 and the lead-out area processing cancel unit 11. Reference numeral 13 denotes a system controller including a lead-out area detecting unit 9, a lead-out area processing unit 10, a lead-out area processing canceling unit 11, and a mechanism control unit 12, and is configured by, for example, a microcomputer. An operation unit 14 includes a switch for the user to start operations such as constant speed reproduction and fast forward.

Regarding the R-DAT configured as described above,
The operation will be described with reference to FIG. 2, FIG. 2, FIG. 3 and FIG. FIG. 2 is a flowchart showing a part of the processing of the system controller 13. A connector 21 and a connector 29 are connected to a part of the entire processing of the system controller 13.

First, as shown in FIG. 3, when the user selects the constant-speed reproduction (or fast-forward) switch of the operation unit 14 during reproduction of the accessible area of the magnetic tape 2, the system controller 13 discriminates the discrimination shown in FIG. In step 22, a constant speed reproduction (or fast forward) command is recognized, and the process proceeds to step 23. In the processing step 23, the mechanism control unit 12 outputs a control signal so that the mechanism 1 performs constant-speed reproduction (or fast-forward), and reaches the determination step 24. Judgment step 24
In, the lead-out area processing cancellation unit 11
From the output signal of the non-recording portion detection circuit 9, it is detected that the recording portion is a recording portion, and the process proceeds to a determination step 25. The lead-out area detecting section 9 stays in the determination step 25 until the magnetic tape 2 changes from the recording section to the non-recording section, and reaches the processing step 26 when the magnetic tape 2 changes from the recording section to the non-recording section. In processing step 26, the lead-out area detection unit 9
The internal timer is started, and the process proceeds to the determination step 27.
In the determination step 27, the lead-out area detecting section 9
When the time equivalent to running the tape approximately 73.35 mm has elapsed, the lead-out area processing unit
An output signal indicating that the lead-out area has been detected is output to 10, and the process proceeds to a processing step. In processing step 28, the lead-out area processing unit 10
At 12, a signal is output to execute a lead-out area process such as auto-rewind or auto-stop, and the signal reaches the connector 29. That is, as in the case of the conventional digital tape recorder, when the player enters the lead-out area from the accessible area at the constant speed playback (or fast forward), the auto stop or the auto rewind works.

However, as shown in FIG.
When the user selects the constant-speed reproduction (or fast-forward) switch of the operation unit 14 during reproduction of the non-recording portion of the above, the system controller 13 causes the lead-out area processing canceling unit 11 to execute the determination step 24 of FIG. Then, it is detected from the output signal of the non-recording portion detection circuit 9 that the portion is a non-recording portion, and reaches the connector 29. That is, unlike the conventional R-DAT, the system controller 13 bypasses the lead-out area detection processing from the determination step 25 to the determination step 27 and bypasses the lead-out area processing in the processing step 28, as shown in FIG. Auto stop or auto rewind does not work as shown in FIG.

As described above, according to the present embodiment, the non-recording portion detection circuit 8
A lead-out detecting unit 9 for detecting a lead-out area; a lead-out area processing unit 10 for outputting a signal to a mechanism control unit 12 so that the mechanism 1 performs a lead-out area process; Alternatively, if the position of the magnetic tape 2 at the time of performing the fast-forward operation is a non-recording section, a lead-out area processing canceling section 11 that sets the mechanism 12 so that the lead-out area processing is not executed.
In the normal constant speed playback (or high speed winding) operation, a readout area process such as an auto rewind or an auto stop is executed, and a cleaning tape for cleaning the tape and cleaning the head is provided. Is played back, there is an effect that the auto stop or auto rewind does not work every time the vehicle travels 73.35 mm even if the non-recording section continues.

In the above embodiment, the lead-out area detection unit 9
Is configured to detect by a internal timer that the tape travels 73.35 mm in length. However, the length of the tape is determined based on the rotation speed of the reel base and the capstan of mechanism 1.
It may be configured to detect that the vehicle has traveled 73.35 mm.

Effect of the Invention As described above, the present invention provides a lead-out area detecting means for detecting a lead-out area at the time of constant-speed playback or fast-forwarding, and a lead-out mechanism when the lead-out area detecting means detects a lead-out area. By providing a lead-out area processing means for instructing processing, and a lead-out area processing canceling means for not performing the lead-out area processing when the tape position at the start of constant-speed playback or fast-forward is a non-recording portion, If the user tries to run the tape at constant speed playback or fast forward from the tape position in the non-recording area for the purpose of dusting the tape for the first time or cleaning the head, a lead-out area such as auto rewind or auto stop is used. Since no processing is performed, the intended purpose of the user can be achieved. .

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital tape recorder according to an embodiment of the present invention, FIG. 2 is a flowchart showing a part of processing of the system controller, and FIGS. 3 and 4 are relations between a magnetic tape and the movement of a mechanism. FIG. 2 ... magnetic tape, 8 ... no-recording detection circuit, 9 ... lead-out area detection section, 10 ... lead-out area processing section, 11 ... lead-out area processing cancel section, 12 ...
... Mechanism control unit, 13 ... System controller, 14
…… Operation unit.

Claims (1)

(57) [Claims] At the time of constant speed reproduction or fast forward, a lead-out area detecting means which regards a non-recorded part as a lead-out area when a non-recorded portion continues for a predetermined length or more, and the lead-out area detecting means detects the lead-out area. In the case, a lead-out area processing means for instructing a mechanism to perform a lead-out area processing such as an auto-stop or an auto-rewind, and the read-out area when the tape position at the start of constant-speed reproduction or fast-forwarding is a non-recording section, A digital tape recorder comprising a lead-out area processing canceling unit that does not perform processing.