JPH0270585U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a conventional VTR, and FIG. 3 is a waveform diagram for explaining FIG. 2. 7, 8...first and second main rotating heads, 9,1
0...First and second auxiliary rotating heads, 15, 16
, 17, 18...first to fourth coupling capacitors,
19 ...First switching control circuit, 21...Switching transistor, 22...Reference voltage source, 26,2
7, 28, 29...first to fourth reproduction amplifiers, 3
0, 32, 33...first to third switches.

Claims (1)

[Claims for Utility Model Registration] (1) A rotary head that traces a video track, a head amplifier that amplifies a reproduced RF signal from the rotary head, and a head amplifier that is inserted in a signal path between the rotary head and the head amplifier. A video tape recorder having a coupling capacitor comprising: a reference voltage source that generates a DC voltage equal to the DC voltage of the signal path; a changeover switch having one end connected to the reference voltage source and the other end connected to the signal path; 1. A video tape recorder characterized in that a video tape recorder is provided to prevent a signal from being applied to the head amplifier when not in use. (2) first and second main rotary heads having different azimuth angles and arranged approximately 180 degrees apart; and located near the first and second main rotation heads and arranged approximately 180 degrees apart. first and second auxiliary rotary heads having the same azimuth angle as the first and second main rotary heads, and the two reproduced RF signals from the first and second main rotary heads are combined. A first switch which is applied via a capacitor and selects and outputs one of them according to the RF switch pulse, and two reproduced RF signals from the first and second auxiliary rotary heads are applied via a coupling capacitor. and a second switch that selects and outputs one of the RF switch pulses according to the applied RF switch pulse, and performs special playback using the output signals of the first and second switches. and a reference voltage source that generates a DC voltage equal to the DC voltage of a signal path between the switch and the first or second switch, one end of which is connected to the reference voltage source, and the coupling capacitor and the first or second switch. and a changeover switch, the other end of which is connected between the video tape recorder and the changeover switch, the changeover switch being opened and closed in response to a control signal for special playback. (3) first and second main rotating heads having different azimuth angles and arranged approximately 180 degrees apart; and a main rotating head arranged near the first main rotating head and the same as the first main rotating head. An auxiliary rotary head having an azimuth angle, and two regenerative RF signals from the first and second main rotary heads are applied via first and second coupling capacitors, respectively, and either one of the two is applied in response to an RF switch pulse. a first switch that selects and outputs one of the signals, and a second switch that selects and outputs either the reproduced RF signal from the auxiliary rotary head that has passed through the third coupling capacitor and the output signal of the first switch.
A video tape recorder comprising a switch and performing special playback using the output signal of the second switch, generating a DC voltage equal to the DC voltage of the signal path between the third coupling capacitor and the second switch. a reference voltage source; and a changeover switch, one end of which is connected to the reference voltage source and the other end of which is connected between the third coupling capacitor and the second switch, and which outputs a control signal for special reproduction. A video tape recorder characterized in that the changeover switch is opened and closed depending on the user's needs.