Method and an apparatus for detecting tape speed of recording

Details Method and an apparatus for detecting tape speed of recording Method and an apparatus for detecting tape speed of recording

1986-12-01

1989-03-07

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 91, 360 102, 360 7715, G11B 552, G11B 15467

Patent

active

048111295

ABSTRACT:
In a helical scanning type VTR utilizing a tracking error signal method using four kinds of pilot signals, a tape speed at recording is detected by comparing a threshold level value with the level difference between the outputs before and after the change in the two kinds reference signals which are supplied to a multiplying circuit within one magnetic head scanning period, the multiplying circuit obtaining sum and difference frequency signals between a reproduced pilot signal and the reference signal.

REFERENCES:
patent: 4297733 (1981-10-01), Sanderson
patent: 4607298 (1986-08-01), Yamashita
patent: 4618899 (1986-10-01), Doutsubo
patent: 4663673 (1987-05-01), Doutsubo
patent: 4680648 (1987-07-01), Takayama
patent: 4683503 (1987-07-01), Takimoto
patent: 4691256 (1987-09-01), Kozuki et al.

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