Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1984-07-03
1985-12-31
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 68, G11B 545, G11B 562
Patent
active
045624925
ABSTRACT:
A noise reduction circuit for use with an audio signal system of a magnetic recording and playback apparatus which is equipped with an encoder for recording an audio signal on a recording medium with a desirable S/N ratio and a decoder for desirably restoring a high frequency component of a recorded signal and reproducing an audio signal with little noise. A low pass filter is provided after a voltage control amplifier so as to attenuate a noise component in a high frequency range which is attributable to the voltage control amplifier itself. A high pass filter has a filtering characteristic which makes the signal level in a high frequency range higher, compared to conventional one, thereby lowering the level of an output of the encoder in a high frequency range.
REFERENCES:
patent: 4340950 (1982-07-01), Kosaka
patent: 4369509 (1983-01-01), Akagiri
Canney Vincent P.
Victor Company of Japan , Limited
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