Title:
BLOCK FLOATING POINT COMPRESSION OF SIGNAL DATA
Document Type and Number:
WIPO Patent Application WO/2011/050293
Kind Code:
A3
Abstract:
A method and apparatus for compressing signal samples uses block floating point representations where the number of bits per mantissa is determined by the maximum magnitude sample in the group. The compressor defines groups of signal samples having a fixed number of samples per group. The maximum magnitude sample in the group determines an exponent value corresponding to the number of bits for representing the maximum sample value. The exponent values are encoded to form exponent tokens. Exponent differences between consecutive exponent values may be encoded individually or jointly. The samples in the group are mapped to corresponding mantissas, each mantissa having a number of bits based on the exponent value. Removing LSBs depending on the exponent value produces mantissas having fewer bits. Feedback control monitors the compressed bit rate and/or a quality metric. This abstract does not limit the scope of the invention as described in the claims.
Inventors:
WEGENER ALBERT W (US)
Application Number:
PCT/US2010/053809
Publication Date:
September 22, 2011
Filing Date:
October 22, 2010
Export Citation:
Assignee:
SAMPLIFY SYSTEMS INC (US)
WEGENER ALBERT W (US)
WEGENER ALBERT W (US)
International Classes:
G06F7/38; G06F9/06
Foreign References:
| US6148317A | 2000-11-14 | |||
| US5220523A | 1993-06-15 | |||
| US20080154999A1 | 2008-06-26 | |||
| US20070257824A1 | 2007-11-08 | |||
| US5933360A | 1999-08-03 |
Other References:
See also references of EP 2491488A4
Attorney, Agent or Firm:
HAYNES, Mark, A. (P.O. Box 366Half Moon Bay, CA, US)
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