Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1993-12-10
1996-02-06
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 54, 369 60, 395 213, 395 21, 395 239, 375240, G10L 500, G11B 700, G11B 2736
Patent
active
054901308
ABSTRACT:
An apparatus for deriving a compressed digital signal from a digital input signal by compressing the digital input signal in a selected one of at least two compression modes. The compressed digital signal has a different bit rate in each of the compression modes. The apparatus includes a receiving circuit that receives the digital input signal at the same sampling frequency in all compression modes. The apparatus also includes a low-pass filter that has a cut-off frequency set according to the selected one of the compression modes. The low-pass filter receives the digital input signal and provides a bandwidth-limited signal. Finally, the apparatus includes a compressor circuit that derives the compressed digital signal from the bandwidth-limited signal. In an alternative embodiment, the apparatus comprises a circuit that receives the digital input signal at the same sampling frequency in each of the compression modes. The apparatus also includes a block dividing circuit that divides the digital input signal in time into blocks. Each block has a block length; and the block lengths of the blocks have a maximum block length that depends on the selected one of the compression modes. The maximum block length is greater in the compression modes in which the digital output signal has a lower bit rate. Finally, the apparatus includes a compressor circuit that derives the compressed digital signal from the blocks of the digital input signal.
REFERENCES:
patent: 5243588 (1993-09-01), Maeda et al.
patent: 5244705 (1993-09-01), Tsurushima et al.
patent: 5264846 (1993-11-01), Oikawa
patent: 5294925 (1994-03-01), Akagiri
patent: 5301205 (1994-04-01), Tsutsui et al.
patent: 5311561 (1994-05-01), Akagiri
patent: 5388209 (1995-02-01), Akagiri
Chu Kim-Kwok
Epps Georgia Y.
Hardcastle Ian
Sony Corporation
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