JPS62150716U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing one embodiment of this invention, FIG. 2 is an explanatory diagram of frequency allocation shown to explain the operation of the device of this invention, and FIG. 3 is another embodiment of this invention. FIG. 4 is a diagram illustrating a configuration showing an example, and is a diagram showing still another embodiment of this invention. 12a, 12b, 31a, 31b... Rotating head, S1-S6... Switch, 16... Equalizer circuit, 20... Servo circuit, 21-24... Frequency divider, 25
... Synchronous pulse generation circuit for dubbing.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A magnetic recording and reproducing machine that performs magnetic recording and reproducing using a helical scan method, which includes a group of rotating heads that trace recording tracks on a magnetic tape, and a continuous reproduction signal from the output of this group of rotating heads. a head changeover switch for
Equalizer means for outputting the reproduction signal to a reproduction signal output terminal for dubbing, a capstan drive motor for driving the magnetic tape, and a drum drive motor for driving the rotating drum to which the rotating head group is attached at a steady speed of n. a circuit that derives a dubbing switching pulse having a period 2n times that of the vertical synchronizing pulse from the servo means and supplies it to a control terminal of the head switching switch; A synchronization pulse generation circuit for dubbing generates synchronization pulses for dubbing by processing the synchronization pulses at twice the period, and supplies the output to a group of rotating heads that perform recording on the magnetic tape. A recording terminal for dubbing to which a reproduction signal output terminal for dubbing is connected, and a recording video processing circuit that supplies the synchronizing pulse for dubbing to a recording video processing circuit, and a reference pulse obtained by this circuit drives a drive motor for the magnetic tape.
A dubbing device for a magnetic recording/reproducing machine, comprising servo means for switching a drive motor of a rotary drum to which the rotary head group is attached to n times the steady speed. (2) The servo means for switching the magnetic tape drive motor and the drum drive motor of the rotary drum to which the rotary head group is attached to n times the steady speed is configured to switch the drive motor for the capstan and the drive motor for the rotary drum to n times the normal speed. All rotation detection pulses and control pulses reproduced from the magnetic tape,
A dubbing device for a magnetic recording/reproducing machine according to claim 1, characterized in that the dubbing device for a magnetic recording/reproducing machine is equipped with a frequency dividing means that divides the frequency to 1/n times that of normal reproduction. (3) The synchronizing pulse generation circuit for dubbing is a circuit that obtains the synchronizing pulse for dubbing by using the positive and negative edges of the switching pulse for dubbing as a trigger, as described in claim 1 of the utility model registration claim. dubbing device for magnetic recording and reproducing machines. (4) The servo means for switching the magnetic tape capstan drive motor and the rotary drum drive motor to which the rotary head group is attached to n times the steady speed increases the frequency of the reference signal used to n times the normal reproduction speed. A dubbing device for a magnetic recording/reproducing machine according to claim 1, characterized in that the dubbing device has a means for switching to a magnetic recording/reproducing machine.