Method and apparatus for reducing the word length of a...

Details Method and apparatus for reducing the word length of a... Method and apparatus for reducing the word length of a...

2006-08-08

2006-08-08

Tran, Khai (Department: 2611)

Pulse or digital communications

Pulse code modulation

Differential

C375S240000, C375S260000, C375S244000, C375S377000, C341S131000, C341S138000, C386S349000, C704S226000, C704S230000

Reexamination Certificate

active

07088779

ABSTRACT:
A method and signal processing apparatus for reducing the number of bits of a digital input signal (Mi), includes adding a pseudo-random noise signal (Na) to the digital input signal (Mi) to obtain an intermediate signal (Di), the pseudo-random noise signal (Na) being defined by noise parameters (Np), and quantizing the intermediate signal (Di), having a word length of n bits, to a reduced word-length signal (Me) having a word length of m bits, n being larger than or equal to m. The method further includes quantizing the intermediate signal (Di) using a first transfer function which is non-linear, the first transfer function being defined by non-linear device parameters (NLDp).

REFERENCES:
patent: 5287420 (1994-02-01), Barrett
patent: 5402124 (1995-03-01), Todd et al.
patent: 5774842 (1998-06-01), Nishio et al.
patent: 5901178 (1999-05-01), Lee et al.
patent: 5946652 (1999-08-01), Heddle
patent: 2293297 (1996-03-01), None

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