Magnetic recording and reproducing apparatus having a drum pream

Details Magnetic recording and reproducing apparatus having a drum pream Magnetic recording and reproducing apparatus having a drum pream

1993-09-28

1999-05-04

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 46, 360 68, G11B 503

Patent

active

059010053

ABSTRACT:
A magnetic recording and reproducing apparatus amplifies a current representing a recording signal reproduced from an information signal recorded on a magnetic tape, suppresses low frequency components of the current amplified signal, then amplifies a voltage representing the suppressed signal. The voltage amplified signal is supplied from a primary winding of a rotary transformer inside a drum to a secondary winding of the rotary transformer disposed outside the drum, and then its low frequency components are emphasized. This avoids the problems of an inadequate S/N in the low frequency components of the output of a voltage amplifier, and difficulty in providing a high voltage signal from a current amplifier. The emphasized signal is supplied to one of a plurality of equalizing circuits that respectively equalize a signal reproduced at one of a plurality of frequencies. The inputs of the equalizing circuits and a terminating resistance are connected to serially located nodes of a transmission line, with higher frequency equalizing circuits disposed closer to the terminating resistance, thereby avoiding introduction of amplitude distortion in the emphasized signal due to reflection along the transmission line.

REFERENCES:
patent: 4500932 (1985-02-01), Sato et al.
patent: 4562492 (1985-12-01), Higurashi
patent: 5051847 (1991-09-01), Philipps

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