AGC circuit with constant envelope circuit for reproduced RF sig

Details AGC circuit with constant envelope circuit for reproduced RF sig AGC circuit with constant envelope circuit for reproduced RF sig

1991-07-01

1993-10-19

Mullins, James B.

Dynamic magnetic information storage or retrieval

Recording or reproducing an information signal and a control...

358315, 360 67, G11B 502

Patent

active

052551261

ABSTRACT:
A recording and reproducing apparatus in which signals are recorded onto and reproduced from a magnetic tape wound around a peripheral surface of a rotary drum by magnetic heads which are attached to the peripheral surface of the rotary drum corresponding to a plurality of channels, respectively, comprises at least: a detector to detect an envelope level of a reproduced RF signal which is derived from the magnetic head every channel; a comparator to compare the detection output and a reference level and to generate a control voltage corresponding to the magnetic head every channel; a latch to store the control voltage; and a circuit to make the envelope level of the reproduction RF signal constant in accordance with a predetermined timing for supplying the control voltage.

REFERENCES:
patent: 3949414 (1976-04-01), Hayashi
patent: 4041526 (1977-08-01), Kaneko
patent: 4445142 (1984-04-01), Horstmann
patent: 4700239 (1987-10-01), Yoshinaka et al.
patent: 4991034 (1991-02-01), Sato

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