Enhancement of the dynamic range of a multibit...

Details Enhancement of the dynamic range of a multibit... Enhancement of the dynamic range of a multibit...

2007-07-03

2007-07-03

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

C341S144000

Reexamination Certificate

active

11352104

ABSTRACT:
A digital-to-analog converter (DAC) for an audio system may include at least first and second subsets of individually selectable elementary current sources for delivering analog output current contributions, a code conversion circuit for selecting elementary current sources of first and second subsets as a function of codes of a pulse code modulated (PCM) input signal. The DAC may multiply by a certain factor incoming codes of the PCM signal after their value has remained lower than a threshold for a certain period of time and for as long as their value equals or surpasses the threshold value, and may correspondingly scale and de-scale by the same factor the amplitude of the analog output current contributions produced by the elementary current sources of the two subsets.

REFERENCES:
patent: 5864311 (1999-01-01), Johnson et al.
patent: 5960092 (1999-09-01), Lai
patent: 6417793 (2002-07-01), Bugeja et al.
patent: 6927715 (2005-08-01), Chang et al.
Enami Kazumi; “D/A Conversion Processing”, Patent Abstracts of Japan, Publication No. 06069741 published Mar. 11, 1994, vol. 18, No. 318.
Hashimoto Tadao, “Dynamic Range Extending Device”, Patent Abstracts of Japan, Publication No. 07254832, published Oct. 3, 1005, vol. 1996, No. 02.

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