Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1993-10-26
1995-03-28
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358430, 348405, 375246, H04N 1417
Patent
active
054022444
ABSTRACT:
Disclosed herein is a system which is capable of providing a high efficient bit rate reduction by selectively employing two or more variable length code tables, depending on the magnitude of the quantization parameter employed in the digitalization process. The system includes a transmitter having a differential pulse code modulator for producing differential signal samples quantized by employing two or more quantization parameters and a variable length coding circuit. The variable length coding circuit for performing a variable length coding process comprises four variable length coding lockup tables for storing variable length code words, each of the variable length coding lockup tables reflecting a statistic of the signal words quantized by each of the quantization parameters; and switching circuit responsive to each of the quantization parameters for selecting one variable length coding lookup table so as to carry out a variable length coding operation. A receiver includes a variable length decoding circuit comprising four variable length decoding lockup tables for differential signal samples, each of variable length decoding lockup tables corresponding to each of the lockup tables; and a switching circuit responsive to each of the quantization parameters for selecting one variable length decoding lookup table so as to carry out a variable length decoding operation.
REFERENCES:
patent: 4816914 (1989-03-01), Ericsson
patent: 4942467 (1990-07-01), Waldman et al.
Coles Sr. Edward L.
Daewoo Electronics Co. Ltd.
Lee Thomas D.
Pinsak William F.
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