Apparatus for recording and reproducing digital using dynamic ra

Details Apparatus for recording and reproducing digital using dynamic ra Apparatus for recording and reproducing digital using dynamic ra

1987-07-24

1989-04-25

Faber, Alan

Dynamic magnetic information storage or retrieval

Recording for changing duration, frequency or redundant...

360 32, G11B 509

Patent

active

048253057

ABSTRACT:
A digital signal recording and reproducing apparatus comprising a dynamic range compression/expansion apparatus. The compression/expansion apparatus receives a digital signal from, for example, an analog-to-digital converter and compresses the dynamic range of the digital signal and the so compressed digital signal is supplied to a recording signal processing circuit in the recording operation mode, while the apparatus receives a digital signal reproduction output from a recording/reproducing head and expands the dynamic range of the reproduced digital signal and the so expanded digital signal is supplied to, for example, a digital-to-analog converter in the reproducing operation mode. The compression/expansion apparatus includes a circuit for controlling the transient response of the apparatus, that is, for controlling the operation of compression/expansion of the dynamic range of the digital signal during transient of the digital signal so that recording of the digital signal is performed at a high density with a high quality, without suffering breathing effect, overflow, etc.

REFERENCES:
patent: 4558378 (1985-12-01), Shibata et al.
"Compression-Expansion Technigues for Wide Dynamic Range Recording", J. Vanderkooy, Review of Scientific Instruments vol. 46, No. 12, pp. 1689-1690, Dec. 1975.

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