Sony Corporation

Keiko Kanetsuka

Teruyuki Yoshida

Hideki Arai

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.

Magnetic recording and reproducing apparatus having a drum preamplifier

A recording amplifier apparatus comprises first and second differential amplification means connected to each other with wires. The second differential amplification means is disposed close to a rotary drum by extending the wires. It is thus possible to restrain generation of a distributed capacity by the wires to a minimum.

Recording signal amplifier apparatus

In a data recording apparatus, the data rate of an incoming information signal is used to select the frequency processing, such as band limiting or high frequency emphasizing, performed on the information signal to alter its frequency characteristic so that the information signal can be digitally recorded with magnetized patterns that are substantially similar even when recording at different recording speeds.

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Kanagawa, Japan

Keiko Kanetsuka