JPH02252155A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To instantly decide whether a tape is recordable or not by rewinding the tape from a recording commencing position by a prescribed amt., making afterward the tape travel for reproducing and performing automatically an operation for finding an accurate unused recording track position with a system controller. CONSTITUTION:When a tape rewinding mode is set by a remote controller, etc., the tape is fed in the rewinding direction by a system controller 3. On the other hand, a capstan system counter 7 under reset is set as a measuring mode via a measuring control circuit 9 to calculate a moving amt. of the tape under rewinding. Now, when a comparing decision is made by a tape position comparing and recording circuit 8 that the tape has been rewound to a position of a set desired rewinding value, this comparison output is supplied to the controller 3. By this comparison output, a reproducing mode control signal is outputted by the controller 3 to set a mechanical tape traveling system driving circuit 4 and a video circuit 5 as a reproducing mode respectively. Then, when the original position is detected by the circuit 8, a pause mode is set by the controller 3, and afterward, a recording mode is to be set. During the period of this pause, the operator decides whether the recording should be continued or not.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a magnetic recording and reproducing apparatus that prevents double recording on a recorded tape.

(Prior Art) Conventionally, in magnetic recording and reproducing devices such as cassette video tape recorders and audio tape recorders, a double recording prevention claw is provided on the cassette leaf of the magnetic tape, and the recorded tape is recorded by changing the position of the claw. 1 recording prevention state) to prevent accidental erasure. However, such a double recording prevention claw is sometimes forgotten because it is a manual operation. Furthermore, on a tape with unused recorded portions remaining, the prevention claw is not placed in the double recording prevention state, so there is a risk that information on recorded track portions may be erased.

Therefore, when recording on a cassette tape that is not set to prevent double recording, the tape must be played back and checked on the screen in order to locate the beginning of an unused recording track.

(Problem to be Solved by the Invention) A conventional magnetic recording/reproducing device plays back the -i tape in order to determine whether or not a new signal can be recorded on the currently set cassette tape. to check the screen. As a result of the confirmation, if it is OK to record from the original position, the troublesome work of returning the tape to its original position is not necessary.

This invention eliminates the above problems, automatically rewinds and plays back, and reliably prevents double recording on a recorded tape.
The purpose of the present invention is to provide a magnetic recording/reproducing device.

[Structure of the Invention (Means for Solving the Problem) This invention, when setting the recording mode, rewinds the currently set magnetic tape from the position where recording is to be started by a predetermined number of M, and then the tape is played back. The present invention is characterized in that the system controller automatically performs the work of finding the correct unused recording track position.

(Function) With this configuration, you can easily check whether or not the position where you paused to record is actually a good position to record by looking at the reproduced image of the part that was rewound and played back. .

(Embodiment) FIG. 1 is a configuration diagram showing an embodiment of a magnetic recording/reproducing apparatus according to the present invention.

In FIG. 1, reference numeral 1 indicates a timer circuit that performs timer recording, and reference numeral 2 indicates a timer output horn based on a remote control signal from the timer circuit 1 or a remote control receiving circuit (not shown).
A logic control circuit 3 outputs logic control signals such as special playback control signals, and a system controller 1 controls a mechanical tape running system drive circuit 4 and a video circuit 5.
-La, 6 (Key 1: Bustan rotation detection pulse generator consisting of a capstan coil and its output amplifier, etc.; 7 is a capstan system counter that counts pulses from the gear Bustan rotation detection pulse generator 8; 8 is a recording This is a tape position comparison and storage circuit that stores in advance a rewind setting value corresponding to the amount of rewinding for checking the running track, and compares the output value of the capstan system counter 7 with this set value.

The system controller 3 supplies a comparison mode signal to the tape position comparison and storage circuit 8, and the tape position comparison and storage circuit 8 supplies a comparison determination output to the system controller 3. In addition, capstan counters 7G, 1
, the counting period and measurement timing are controlled by signals from a measurement control circuit 9 controlled by the system controller 3.

This embodiment is constructed as described above, and its operation will now be explained in the case of the normal recording mode.

When the tape recording mode is set by means such as a remote control or a panel operation button, the system controller 3
Feed the tape in the rewind direction. On the other hand, the reset capstan counter 7 is put into measurement mode via the measurement control circuit 9, and the amount of tape movement during rewinding is calculated.

When the tape position comparison and storage circuit 8 compares and determines that the tape has been rewound to the position of the desired rewind setting value,
The comparison output is supplied to the system controller 3.

The system controller 3 generates a playback mode control signal based on the comparison output, and generates a mechanical tape running system drive circuit 4.
and puts the video circuit 5 into playback mode. In this case, playback is continued until the count value of the capstan system counter 7 becomes the same as the value counted at the time of rewinding or a number that is slightly modified. Then, in the tape position comparison and storage circuit 8,
Upon detecting the original position, the system controller 3 enters the pause mode and then switches to the recording mode. During this pause period, the operator can choose to continue recording or set another cassette.

Next, other embodiments will be explained.

FIG. 2 shows another embodiment of the present invention, in which a sensor (reel rotation speed detection pulse generator) 6' for detecting reel rotation is used to measure the amount of web travel. The output pulse of the reel rotation speed detection pulse generator 6' is
The signal is supplied via a reel counter 7' controlled by a measurement control circuit 9' to a tape position comparison and storage circuit 8 which operates similarly to the embodiment of FIG. Further, in this embodiment, a reproduced signal obtained from the video circuit 5 is input to a digital memory circuit 10 capable of storing and reading. Reproduction signals obtained from the video circuit 5 and the digital memory circuit 10 are selectively output by a reproduction image selection circuit 11. The selection operations of the digital memory circuit 10 and the reproduced image selection circuit 11 are controlled by the system controller 3.

In this case, when the tape recorder is set, the system controller 3 rewinds the tape a predetermined number of meters and then plays it back, as in the actual flow example described above. If a reproduced signal is obtained during this reproduction, the corresponding reproduced signal is stored in the digital memory circuit 10. Therefore, when the signal is stored in the digital memory circuit 10, the reproduced image selection circuit 11 selects the reproduced signal from the digital memory circuit 10. Select the playback signal and display it on the screen. This allows the operator to determine that the signal was recorded during rewinding from the original position. In this case as well, the operator can select whether or not to change the recording to another tape during the predetermined waiting period.

Although the above embodiment was conducted in the recording mode, the same applies to the recording-assistance stop mode, timer recording standby mode, and timer recording mode.

The rewind time is REVIEW.

By using the rewind (RFW) high-speed mode, the time between playbacks can be shortened.

Furthermore, the means for measuring the amount of tape travel may utilize CTL pulses from a control head.

[Effects of the Invention] As explained above, according to the present invention, when the recording mode is set, the tape is automatically played back in a fixed amount, so that the operator can immediately check whether the tape is really suitable for recording. This has the effect that it can be confirmed by

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic recording/reproducing apparatus according to the present invention, and FIG. 2 is a block diagram showing a further embodiment of the present invention. 2...Logic control []-control circuit, 3...System controller, 4...Mechanical/tape running system drive circuit, 5...Video circuit, 6...Cab scan rotation detection pulse generator, 7 ... Capstan system counter, 8.
. . . Tape position comparison and storage circuit, 10 . . . Digital memory circuit, 11 . . . Reproduction image selection circuit.

Claims (1)

[Claims] A tape driving means for rewinding the magnetic tape by a predetermined amount when setting a recording mode, and then reproducing the tape, a tape running amount detecting means for detecting the tape running amount during said rewinding, and an output of this running amount detecting means. 1. A magnetic recording and reproducing apparatus comprising: a system controller that defines the reproducing travel amount based on the amount of reproduction and stops the tape at its original position.