JPH0320052U

JPH0320052U -

Info

Publication number: JPH0320052U
Application number: JP7942689U
Authority: JP
Priority date: 1989-07-05
Filing date: 1989-07-05
Publication date: 1991-02-27

Description

[Brief explanation of drawings]

第１図は本考案の回転ヘツド方式デイジタル信
号再生装置の一実施例の構成を示すブロツク図、
第２図は従来の回転ヘツド方式デイジタル信号再
生装置の一例の構成を示すブロツク図、第３図は
、第１図の実施例におけるサンプリングホールド
回路の一実施例の構成を示すブロツク図、第４図
ａはＲ−ＤＡＴにおけるトラツクの模式的平面図
、第４図ｂは第４図ａにおけるメインエリアに記
録されるメインデータブロツクのフオーマツトの
説明図、第５図は、第３図の実施例におけるタイ
ミングチヤートである。２１……回転シリンダ、２２……回転ヘツド、
２９……比較回路、３０……電圧制御発振器、３
１……比較回路、３２……発生回路、３６……モ
ータドライバ。 FIG. 1 is a block diagram showing the configuration of an embodiment of the rotary head type digital signal reproducing device of the present invention.
FIG. 2 is a block diagram showing the configuration of an example of a conventional rotary head type digital signal reproducing device, FIG. 3 is a block diagram showing the configuration of an example of the sampling and holding circuit in the embodiment of FIG. 1, and FIG. Figure a is a schematic plan view of a track in R-DAT, Figure 4b is an explanatory diagram of the format of the main data block recorded in the main area in Figure 4a, and Figure 5 is the embodiment of Figure 3. This is a timing chart. 21... Rotating cylinder, 22... Rotating head,
29... Comparison circuit, 30... Voltage controlled oscillator, 3
1...Comparison circuit, 32...Generation circuit, 36...Motor driver.

Claims

[Claims for Utility Model Registration] (1) A rotary head for reproducing digital data signals recorded on a magnetic tape, and a clock for extracting a clock contained therein from the reproduced digital data reproduced by the rotary head. extraction means; reference clock generation means for generating a reference clock having the same frequency as a regular clock included in the digital data; a clock extracted by the clock extraction means; and a reference clock generated by the reference clock generation means. 1. A rotary head type digital signal reproducing apparatus comprising: a frequency comparing means for comparing the frequencies of the rotary head and outputting an error signal; and a rotation control means for controlling the rotation of the rotary head in response to the output of the frequency comparing means. (2) A parity check means for performing a parity check based on a parity code included in the reproduced digital data, and an error signal output from the frequency comparison means is controlled in accordance with the output of the parity check means. 2. The rotary head type digital signal reproducing apparatus according to claim 1, further comprising signal control means for controlling the rotary head type. (3) a measuring means for measuring the length of time in which the parity check result by the parity check means is less than or equal to a predetermined reference value set in advance; a drive signal generation means for generating a drive signal that increases or decreases the frequency of the rotation control circuit; 3. The rotary head type digital signal reproducing apparatus according to claim 2, further comprising selection means for supplying the signal to the rotary head type digital signal reproducing apparatus. (4) detection means for detecting a tracking control signal used for tracking control of the rotary head contained therein from the reproduced digital data; a reference timing signal generation means for generating a reference timing signal; a phase comparison means for comparing the phase of the output of the detection means and the reference timing signal outputted by the reference timing signal generation means and outputting an error signal thereof; Claim 1 further comprising adding means for adding the output of the frequency comparison means and the output of the phase comparison means and supplying the sum signal to the rotation control means.
, 2 or 3.