JPH0185933U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a block diagram of a tracking control device for a VTR which is an embodiment of the present invention, and FIG. 2 is a plan view of a videotape showing the relationship between recording tracks and recording pilot signals in VTRs of a conventional example and an embodiment. , FIG. 3 is a timing chart showing the relationship between the reproduction pilot signal and the reference pilot signal when the scanning locus of the magnetic head deviates in the VTRs of the conventional example and the embodiment, and FIG. 4 shows the timing chart of the VTR of the conventional example and the embodiment. FIG. 5 is a plan view showing the position of the magnetic head provided on the rotating drum. FIG. 5 is a plan view of a recording track on a video tape showing the scanning locus of the magnetic head during still playback in a conventional VTR. FIG. A timing chart of each signal showing a method of noise-free still playback in the VTR of the example and the example. FIG. 8 to 11 are timing charts of each signal in the tracking control device of the embodiment, FIG. 12 is a flow chart showing the control operation of the tracking control circuit in the tracking control device of the embodiment, and FIG. FIG. 14 is a timing chart of each signal at the time of transition from normal playback to still playback in the tracking control device of the embodiment. 2... Rotating drum, Ha, Hb, Hc... Magnetic head, 11A, 11B, 11C, 27A... Switch, 12... Low pass filter (LPF),
13... Multiplier, 14... Reference pilot signal generation circuit, 21, 22... Band pass filter (BP
F), 23, 24...Diode, 26...Subtractor, 27B...Inverter, 29...Level comparison circuit, 30...Tracking control circuit, 40...
System control circuit, 41...capstan drive circuit.

Claims (1)

[Claims for Utility Model Registration] A magnetic head scans a recording track on a magnetic tape in which a plurality of types of pilot signals each having a plurality of different frequencies are recorded together with a recording signal, and the pilot signal is recorded on the recording track. in a tracking control device for still playback that performs tracking control based on the reproduced pilot signal to perform still playback, a first detection means for detecting a switching operation to still playback and outputting a detection signal; After a switch to still playback is detected by a detection signal output from the first detection means, which is at least two types of pilot signals selected and set in advance from among the plurality of types of pilot signals. a second detection means that detects the first pilot signal and outputs a detection signal; and a pilot signal detected by the second detection means in response to the detection signal output from the second detection means. 1. A tracking control device for still playback, comprising a control means for controlling the still playback by playing back corresponding recorded tracking.