JPS63311649A - Drum drive control system - Google Patents

Abstract

PURPOSE:To contrive the shortening of time till the sound production or the recording enable state by continuing the rotation of a drum at rotational speed at the playing state for a prescribed time even in the case of succeeding halt state when the halt state is discriminated. CONSTITUTION:When the halt state is discriminated by the operation of a stop key 19c, a system controller 13 keeps the drive of the drum 17 at the rotational speed at the play for a prescribed time regardless of the stop condition to bring the state into the standby state. When the recording/play state is transited within a prescribed time, the recording is immediately enabled or sound is to be produced. Thus, the time from the halt state till the recording enable state or the sound production is reduced remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a drum rotation control system, and more particularly to a drum rotation control system in a rotary head type tape recording/reproducing apparatus.

<Prior art> VTT (or DAT (digital audio tape)
In a recording/reproduction device), the head is rotated while being inclined relative to the longitudinal direction of the magnetic tape, and
The head records video signals and audio signals on the magnetic tape, and reads and reproduces the video signals and audio signals from the magnetic tape. Of these, the DAT has two heads H for both recording and playback, spaced 180 degrees apart from each other, as shown in Figure 3.
D.I.

The HD2 is arranged on a rotating drum (cylinder) DRM, and the magnetic tape and each head are arranged relative to each other so that the running trajectory of each head MDI and HD2 on the magnetic tape MT surface is inclined with respect to the longitudinal direction of the magnetic tape MT. The positional relationship is determined. Then, each time the drum DRM rotates 180 degrees, each head HDl, HD2 alternately contacts the magnetic tape MT for 90 degrees each time, and an audio signal is recorded on the magnetic tape or an audio signal is read from the magnetic tape. .

During recording and playback, the tape MT is fed at a constant speed S.
(=8, 15 m/s), and the drum DRM is rotated at a constant speed of 200 rpm to maintain a constant relative speed between the head and the tape.

Also, during fast forwarding, the tape is fed at 200 times the tape feeding speed during recording and playback, while the drum DRM is rotated at 3023 rpm if the tape feeding direction is in the FF direction, and further at 960 rpm if the tape feeding direction is in the FF direction. be rotated.

<Problems to be Solved by the Invention> Incidentally, in such conventional DAT devices, when the recording state, playback state, or other state changes to the stop state, the rotation of the drum DRM is immediately stopped in order to protect the tape. Therefore, when moving to the recording state or playback state after stopping, the drum rotates at a constant rotational speed (=200 Or pm).
), and there is a problem in that it takes a certain amount of time to produce sound or to reach a recordable state.

In light of the above, an object of the present invention is to provide a drum rotation control system that can significantly shorten the time required from a stopped state to a recordable state or sound output.

<Means for Solving the Problems> FIG. 1 is a block diagram of the main parts of a DAT device that implements the drum rotation control method according to the present invention.

11a and llb are recording/reproducing heads, 13 is a system controller, 15 is a drum rotation control unit, 16 is a drum motor, 17 is a drum, 18 is a timer, 19 is an operation panel, and 19C is a stop key.

When the system controller 13 determines that it is in the stopped state by operating the stop key 19C, etc., the system controller 13 continues to rotate the drum 17 at the rotation speed at the time of play for a predetermined period of time even if it is in the stopped state, and enters a standby state. Make it. and,
To enable recording or to output sound immediately when transitioning to a recording or play state within a predetermined time.

<Embodiment> FIG. 1 is a block diagram of the main parts of a DAT device that implements the drum rotation control method according to the present invention, and FIG. 2 is a flowchart of the processing of the present invention.

In FIG. 1, lla and llb are recording/reproducing heads;
12 is a signal processing section, 13 is a system controller configured with a microcomputer, 14 is a tape running control section, 15 is a drum rotation control section, 16 is a drum motor that rotates the drum fully, 17
1 is a drum to which heads l1m and 11b are fixed, 18 is a timer, and 19 is an operation panel.

The signal processing unit 12 stores the audio data read from the magnetic tape by the first and second recording/reproducing heads lla and llb in the built-in RAM in the playback mode, and performs error detection and correction on the audio data. After other processing,
It is DA-converted and output, and furthermore, the start ID, time code, track number (program number), etc. included in the sub-code are identified. Further, during recording, the signal processing unit 12 adds an error correction code to the audio data input from an analog-to-digital converter (not shown), and records it on the tape together with a predetermined subcode via the recording/reproducing heads lla and llb. .

The tape running control section 14 appropriately fast-forwards, rewinds, and replays the tape according to commands from the system controller 13. Further, the drum rotation control unit 15 also rotates the drum 17 at 960 rpm according to a command from the system controller 13.
m (when REWing), 2000 rpm (when playing and recording)
, rotate at 3023 rpm (when FF).

The operation panel 19 is provided with various operation keys.
For example, 19a is the FF key, 19b is the rewind key,
19C is a stop key, 19d is a play key, and 19e is a record key.

Hereinafter, the overall operation of FIG. 1 will be explained according to the flowchart of FIG. 2.

A processor (not shown) of the system controller 13 monitors whether the system is in a stopped state (step 101).
, if it is not in a stopped state, another process is continued (step 103). The stopped state is when the stop key 19c is pressed, or when the end of the tape is reached by rewinding (REW) or fast forwarding (FF).

On the other hand, if the state is stopped, only the tape running is stopped without stopping the rotation of the drum 17 (step 105).
. Note that if the drum is rotating at 200 rpm before the stop state, the system controller 13 maintains the rotation speed, and rotates the drum to 960 rpm (at REW) or 302 rpm before the stop state.
If the drum is rotating at 3 rpm (when FF), the drum rotation control section 15 is controlled to set the drum rotation speed to 200 rpm.

After that, the system controller 13 causes the timer 18 to start measuring time (step 107), and then compares the measured time t with the set time Ts (step 109).
If t<T, check whether the key operation has changed to another mode (step 111); if not, repeat the process from step 107 onward; if the mode has been changed, change to the other mode. Control is executed according to (step 113). Note that another mode is a play mode by pressing the play key 19d, and a play mode by pressing the play key 19d.
Recording mode by pressing and record key 19e at the same time, F
Fast forward mode by pressing F key 19a, rewind key 1
This is a rewind mode by suppressing 9b.

On the other hand, if the mode is not shifted to another mode within the set time T, then in step 109, since t≧T6, the drum rotation control unit 15 is immediately controlled to stop the rotation of the drum 17, and the same stop state as before is established. (step 115).

<Effects of the Invention> As described above, according to the present invention, when it is determined that the drum is in a stopped state, the drum continues to rotate at the rotation speed at the time of play for a predetermined period of time even if it is in a stopped state. When the recording mode or play mode is entered within a certain period of time, the recording mode can be immediately set or the sound can be output. Please note that within a few seconds after pressing the stop key to stop fast forwarding, or
The present invention is advantageous in such cases since the playback or recording operation is performed within a few seconds after completion.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of a DAT device that implements the drum rotation control system of the present invention, FIG. 2 is a flowchart of the process of the present invention, and FIG. 3 is an explanatory diagram of the relationship between the drum and the head. 11a, llb... Recording/playback head, 13... System controller, 15... Drum rotation control section, 16... Drum motor, 17... Drum, 18... Timer, 19... Operation panel, 19c... Stop Key Patent Applicant Alpine Co., Ltd. Agent Patent Attorney Chiki Saito Figure 1

Claims (1)

[Claims] In a drum rotation control method in a rotary head type tape recording/playback device, when it is determined that the drum is in a stopped state, the drum is rotated at the rotation speed at which it is played for a predetermined period of time even if it is in a stopped state. A drum rotation control method that allows continuous rotation.