Recording speed detecting apparatus

Details Recording speed detecting apparatus Recording speed detecting apparatus

1988-03-24

1990-04-10

Severin, David J.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 7311, G11B 1546

Patent

active

049165607

ABSTRACT:
An apparatus for detecting the speed at which a recording medium was written is provided. While reading the medium, the ratio of the frequency of a control signal, recorded with constant frequency, to the frequency of rotation frequency of a motor for driving the medium is compared to a reference value to determine a recording speed. The determined speed is time sequentially stored in a storing circuit. A recording speed is detected whenever the determined speed obtained in the previous cycle, and stored in the storing circuit, coincides with the determined speed of the current cycle.

REFERENCES:
patent: 4695781 (1987-09-01), Ito
patent: 4811130 (1989-03-01), Takayama

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