JPH02118942A - Magnetic tape video recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain even the program-search of a video signal with reproduction by bringing the mode into the reproducing state by detecting tape loading, bringing the mode into the fast forwarding reproduction when no video signal is outputted and bringing the mode into the reproducing state when the video signal is outputted. CONSTITUTION:When a tape is loaded to a magnetic tape video recording and reproducing device, a detection circuit 4 detects it, a control circuit 5 is driven by its output, a switching circuit 6 is turned on to activate an instruction circuit 8 and a reproducing circuit 9 brings the device into the reproducing state. Moreover, a switching circuit 11 is turned on by the output of the detection circuit 4, an amplifier circuit 12 is driven to amplify the output of an output circuit 10. Moreover, a comparator 13 compares the output of the amplifier circuit 12 and when an envelope is outputted, the instruction circuit 8 is operated and the device continues the reproducing state by the circuit 9. When no envelope is outputted conversely, the circuit 8 instructs the fast forwarding mode and the device is brought into the fast forwarding reproducing state. Then the device is brought into the reproduction state when the envelope is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic tape video recording and reproducing apparatus.

2. Description of the Related Art In recent years, magnetic tape video recording and reproducing apparatuses have become popular in the rental market, and as a result, it has become desirable to be able to reproduce tapes with simple operations.

FIG. 2 shows a block diagram of a conventional magnetic tape video recording and reproducing apparatus.

In FIG. 2, reference numeral 21 denotes a tape start end detection circuit, which is connected to a mode instruction circuit 28 via a control circuit 22 and a switch circuit 23. On the other hand, 24 is a tape attachment detection circuit, which is connected to a mode instruction circuit 28 via a control circuit 25 and a switch circuit 26. A key switch circuit 27 is further connected to the mode instruction circuit 28 . Further, a reproduction circuit 29 is connected to the output side of the mode instruction circuit 28.

The operation of the conventional magnetic tape image two-storage and reproducing apparatus constructed as described above will be described below with reference to the drawings.

When a tape is loaded onto this device, a tape loading detection circuit 24 detects the device, and a control circuit 25 is driven by its output. Accordingly, the switch circuit 26 is turned on,
The mode instruction circuit 28 is operated, and the reproduction circuit 29 puts the device into a reproduction state.

When the tape is played to the end, it is rewound to the beginning of the tape. When this rewinding is completed, the tape start end detection circuit 21
detects the white tape portion, and the control circuit 22 is driven by its output. Accordingly, the switch circuit 23 is turned on, operating the mode instruction circuit 28 and ejecting the tape.

Problems to be Solved by the Invention However, in the conventional configuration as described above, the tape loading detection circuit 24 is driven after the tape device to perform a playback operation, but the video signal is recorded on the tape portion at the time when the playback operation is started. It is not limited to the part that is covered. For this reason, there is a problem in that it is necessary to manually operate the key switch circuit 27 to perform operations such as fast-forward playback to search for the portion where the video signal is recorded.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a magnetic tape video recording and reproducing apparatus that can perform a reproducing operation and also locate the beginning of a video signal when a tape is loaded.

Means for Solving the Problems In order to achieve the above object, the present invention includes a tape loading detection circuit that detects that a tape is loaded and sends the detection signal to a mode instruction circuit to cause a reproduction circuit to perform a reproduction operation. , when the tape attachment detection signal is not emitted, the output signals of the envelope output circuit are compared, and when the envelope is being output, the mode instruction circuit is operated to cause the reproduction circuit to continue the reproduction operation, and the envelope is output. The envelope output comparison circuit operates the mode instruction circuit to cause the playback circuit to perform fast-forward playback when the playback circuit is not output.

Effect of the present invention With the above-described configuration, when a tape is loaded, it detects the tape "9W" and automatically enters the playback state; in addition, if no video signal is output, it enters the fast forward playback state. , it enters the playback state at the time the video signal is output.

Embodiment FIG. 1 shows a block diagram of a magnetic tape video recording and reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a tape start end detection circuit, which is connected to a mode indicating circuit 8 via a control circuit 26 and a switch circuit 3. 4 is a tape attachment detection circuit, which is connected to a mode instruction circuit 8 via a control circuit 5 d3 and a switch circuit 6;
It is connected to the. Further, a key switch circuit 7 is connected to the mode instruction circuit 8. Reference numeral 10 denotes an envelope output circuit for the video φ signal, which is connected to an envelope output comparison circuit 13 via an envelope layer width circuit 12. This envelope output comparison circuit 13 is connected to the mode instruction circuit 8.
It is connected to the. A power supply switch circuit 11 is connected to both circuits 4 and 12 so that it can be turned on by the output of the tape tube detection circuit 4 and drive the envelope amplifier circuit 12. A reproduction circuit 9 is connected to the output side of the mode instruction circuit 8.

The operation of the magnetic tape video recording and reproducing system of this embodiment configured as described above will be described below.

When the tape is attached to the windshield to record and play back the clear image,
The tape attachment detection circuit 4 detects the H attachment, and the control circuit 5 is driven by the output of the detection circuit 4. Accordingly, the switch circuit 6 is turned on, the mode instruction circuit 8 is operated, and the reproducing circuit 9 puts the device into a reproducing state. Further, the power supply switch circuit 11 is turned on by the output of the tape attachment detection circuit 4, thereby driving the envelope single-width circuit 12 and amplifying the output of the envelope output circuit 10. Furthermore, the envelope output comparison circuit 13 is the envelope! A comparison is made between the 8 deer in the labor width circuit 12, and if an envelope is output, the mokaku instruction circuit 8 is operated, and in the reproduction circuit O, gF continues to be in the reproduction state. On the other hand, if the envelope is not output, is it a mode indication port? 88 and give the mode instruction for fast forward playback once,
The device enters the forward playback state. Thereafter, when the envelope is output, the device enters the playback state by the same operation as described above.

When the tape is played back to the end, the tape is rewound to the start end. When rewinding is completed, the tape start end detection circuit 1 detects a white tape portion, and the MJ'ffJ circuit 2 is driven by its output. Accordingly, the switch circuit 3 is turned on, the mode instruction circuit 8 is operated, and the tape is ejected.

As described above, according to this embodiment, the tape attachment detection circuit 4
By providing a power supply switch circuit 11 that operates with the output of the power supply switch circuit 11, an envelope widening circuit 12 that operates with the output of the power supply switch circuit 11, and an envelope output comparison circuit 13, playback is possible simply by loading a tape. In addition to the current state, the location where the video signal is recorded can be found by fast-forward playback and played back.

As described in detail, according to the present invention, not only automatic playback can be performed with a simple operation, but also the beginning of the video signal can be found by setting the playback or fast-forward playback state by outputting the video signal during automatic playback. You can get excellent results such as:

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic tape video recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional magnetic tape video recording and reproducing apparatus. 4...Tape tube detection circuit, 8...Mode instruction circuit, 9...Reproduction circuit, 10...Envelope output circuit, 11...Power supply switch circuit, 12...Envelope amplifier circuit , 13...Envelope output comparison circuit. Agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. A tape loading detection circuit that detects that a tape is loaded and sends the detection signal to a mode instruction circuit to cause the playback circuit to perform a playback operation, and an envelope output circuit when the tape loading detection signal is issued. When the envelope is being output, the mode instruction circuit is operated and the reproduction circuit continues the reproduction operation, and when the envelope is not being output, the mode instruction circuit is operated and the reproduction circuit is activated. A magnetic tape video recording and reproducing apparatus having an envelope output comparison circuit that performs fast-forward reproduction.