JPS6166202A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the insertion and recording of signals without giving any effect to the signal recording/reproducing operations as well as to use an ON/ OFF switch to obtain a miniature changeover switch, by providing the insertion/ recording signal and winding for normal recording to a rotary transformer. CONSTITUTION:When an insertion/recording mode is set during reproduction of a recorded video tape, a system controller 22 receives the synchronizing signal obtained from a reproduction amplifier 6 and delivers the signals of insertion/recording modes for several H periods of a field to turn on switches 14 and 16 and off switches 15 and 21 respectively. The reproduction signal sent from a video head 1 is supplied to the amplifier 6 from a coil 11 via a rotary transformer 10. At the same time, an insertion/record current is delivered from an insertion/recording circuit 4. Then a record current flows to a coil 12. This record current is supplied to the heat 1 via a rotary coil 13 of the transformer 10 and recorded to the video tape.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a data insertion device for a recording and reproducing device such as a VTR, which is capable of recording search data and the like onto a recording medium while operating the recording and reproducing device in a playback mode. .

[Prior Art] In order to search each program recorded on the video tape while operating the VTR in the playback mode and playing back the recorded videotape, search data is recorded, for example, during one field's loss. The method to do this is cold. In order to perform this insertion recording, conventionally, as shown in FIG.
A changeover switch 3 is provided to switch the direction, and its contact a
was inserted into the recording circuit 4, and the contact was connected to the VTR recording amplifier 5. Note that 6 is a reproduction amplifier.

The above-mentioned circuit requires the switch 3 to be of a three-contact type, requiring the use of a relay, etc., and has drawbacks such as the inability to miniaturize the switch itself.

[Object of the Invention] An object of the present invention is to solve the above-mentioned problems and to provide a recording/reproducing device in which the changeover switch can be made smaller.

[Structure of the invention] This invention will be described below with reference to one embodiment.

Note that the same parts as in FIG. 5 are given the same reference numerals and their explanations will be omitted.

The primary side of the rotary transformer 10 is a winding for normal recording and playback! 1 and @ line for insertion record! 2 is provided, and one terminal of the winding 12 is connected to a recording amplifier 5 used in the normal recording mode of the VTR. The other terminal is connected to the reproduction amplifier 6 used in the normal reproduction mode and is grounded via the switch 21.

On the other hand, one terminal of the winding I2 is connected to the output terminal of the insertion recording circuit 4, and the other terminal is grounded. 13 is a secondary winding of the rotary transformer 10 and is connected to the hepto 1.

Recording amplifier 5. Each power supply terminal of the reproduction amplifier 6 and the insertion recording circuit 4 is connected to a power supply via switches 14, 15, and 16.

Each switch l4. For example, transistor switches are used for +5, 16, and 21, and are turned on or off by control signals from the system controller 22 of the VTR. Note that when the recording/reproducing head 1 has two channels, two windings are provided on the secondary side of the rotary transformer IO shown in FIG. 1, and are connected to the heads of each channel.

An example of the winding of the rotary transformer IO is shown in FIG.

In the above configuration, when the VTR is in the normal recording mode, the switch 14 is OFF, the switches I5 and 21 are ON, and the switch 16 is OFF, the recording amplifier 5 is in a driving state, and the insertion recording circuit 4 is inactive. And the recording current is VTR
Record up 5 to coil 11. It flows through switch 21. A current corresponding to video information flows through the recording/reproducing head I through a rotary transformer to perform recording.

Next, in the normal reproduction mode, the switch 14 is turned OFF.

Switches 15 and 21 are OFF, switch I6 is ON, and the playback signal from the video output is transferred to the rotary transformer 10.
The signal flows from the coil 11 to the VTR reproducing amplifier 3 via .

As a result, the image information of the recorded videotape is played back.

When the VTR is set to the insertion recording mode by means of a changeover switch (not shown) or the like, the system controller 22 receives the synchronization signal obtained from the reproduction amplifier 6 and outputs the insertion recording mode signal for a period of the number H of one field. switch 1
4 is ON, switch 15.21 is OFF, switch 16
is turned on, and the playback signal from the video head 1 flows through the rotary transformer 1O and the coil If to the VTR playback amplifier 6. At this time, an insertion recording signal is simultaneously output from the insertion recording circuit 4 during the insertion recording period, and the signal is output to the coil 12. A recording current flows, and the insertion recording signal is transmitted to the video head l through the rotor coil 13 of the rotary transformer 10, and the insertion recording signal is recorded on the video tape during the period H in one field.

The insertion recording signal is, for example, data representing a recording track number.

When the above number H period ends, switch! 4 is turned OFF and returns to normal playback mode.

Note that the rotary transformer may be one in which one coil is provided with an intermediate tap 17, as shown in FIG.

An example of the winding in this case is shown in FIG.

[Effects of the Invention] As described above, according to the present invention, since the rotary transformer is provided with a winding for insertion recording signals and a winding for normal recording, the changeover switch for normal recording and insertion recording is simply an on/off switch. This eliminates the need for large switches such as relays, making the device more compact, and also enables signal insertion and recording without affecting signal recording and playback.

[Brief explanation of drawings]

Fig. 1 is a block circuit diagram showing one embodiment of the present invention, Fig. 2 is a plan view showing the winding of a rotary transformer used in the circuit of Fig. 1, and Fig. 3 is a block diagram showing an embodiment of the pond. , FIG. 4 is a plan view showing the winding of the rotary transformer used in the embodiment of FIG. 3, and FIG. 5 is a block diagram showing a conventional circuit. ! ... Recording/playback head, 4... Insert recording circuit, 5...
Recording amplifier, 6... Reproduction amplifier, 10... Rotary transformer, 11... Normal recording winding, I2... Insertion recording winding.

Claims (1)

[Claims] (1) In a recording/playback device that inserts and records predetermined insertion data into a recorded tape by temporarily supplying a recording current to the recording/playback head of the recording/playback device operating in playback mode, A recording and reproducing device characterized in that a transformer for a reproducing head is provided with a winding for normal recording and a winding for insertion recording.