Recording apparatus

Details Recording apparatus Recording apparatus

1991-12-24

1993-06-01

Swann, Tod

Cryptography

Cryptanalysis

380 3, 380 23, 360 60, 358133, H04N 7167

Patent

active

052167127

ABSTRACT:
A recording apparatus for recording a digital data, which includes an orthogonal transform unit for transforming the time axis of the digital data to the frequency axis on a block-by-block basis, a conversion circuit for converting the digital data from the orthogonal transform means to a digital recording data and a circuit for causing the conversion circuit to convert the digital data to a recording data which is substantially impossible to be restored to the original digital data.

REFERENCES:
patent: 4631603 (1986-12-01), Ryan
patent: 4835682 (1989-05-01), Kurachi et al.
patent: 4908862 (1990-03-01), Kaneko et al.
patent: 4953020 (1990-08-01), De With
patent: 4982282 (1991-01-01), Saito et al.
patent: 5073925 (1991-12-01), Nagata et al.
"New Recording Scheme of DAT", I. Shibazaki, May 1990, Magazine of Radio Technology; pp. 165-176.

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