JPH0212764U

JPH0212764U -

Info

Publication number: JPH0212764U
Application number: JP9070988U
Authority: JP
Priority date: 1988-07-08
Filing date: 1988-07-08
Publication date: 1990-01-26

Description

[Brief explanation of the drawing]

第１図は本考案回路の一実施例を示す構成図、
第５図は第１図の構成の一部における他の実施例
を示す構成図、第２図〜第４図は、それぞれ本考
案の説明に供する図である。４……ＲＦアンプ、５……位相比較器、６……
ローパスフイルタ、７……加算器、８……電圧制
御発振器、９……ヘツド切り換え信号発生器、１
０……遅延回路、１１……周波数／電圧変換器、
ＳＷ１，ＳＷ２……信号切り換えスイツチ、ＳＷ
３……開閉スイツチ、１２……引算器、１３，１
６……演算増幅器、Ｒ１〜Ｒ５……抵抗。 FIG. 1 is a configuration diagram showing an embodiment of the circuit of the present invention;
FIG. 5 is a configuration diagram showing another embodiment of a part of the configuration shown in FIG. 1, and FIGS. 2 to 4 are diagrams for explaining the present invention, respectively. 4...RF amplifier, 5...phase comparator, 6...
Low-pass filter, 7... Adder, 8... Voltage controlled oscillator, 9... Head switching signal generator, 1
0...Delay circuit, 11...Frequency/voltage converter,
SW1, SW2...Signal changeover switch, SW
3...Open/close switch, 12...Subtractor, 13,1
6...Operation amplifier, R1-R5...Resistor.

Claims

[Scope of utility model registration claims] With respect to the track direction formed on the magnetic tape,
This is a clock forming circuit used in a helical scan type digital magnetic reproducing device, which has a rotating drum having at least one set of heads arranged on its circumferential surface with azimuth angles set at angles facing each other, and is a clock forming circuit used in a helical scan type digital magnetic reproducing device. and a clock forming section for forming a reproduced clock signal, and a polarity switching means, and depending on the selection of the polarity switching means, the tape speed (including the direction) and the tape speed (including the direction) during constant speed playback can be changed. a correction voltage signal generating means for outputting a correction voltage signal whose level changes substantially in proportion to the difference but whose state changes between first and second voltage states of mutually different polarities; and a state change period of the correction voltage signal. a selection control signal output means for outputting a selection control signal to the polarity switching means in order to synchronize the period of the rotating drum; A clock forming circuit characterized in that it is configured to apply a correction voltage signal to the clock forming section.