Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1994-07-21
1997-03-11
Deboer, Todd
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341144, 341152, H03M 300
Patent
active
056106068
ABSTRACT:
A 1-bit D/A conversion circuit according to the present invention comprises an RZ signal generating circuit and a PRZ signal generating circuit. The RZ signal generating circuit receives 1-bit digital data sampled at a predetermined frequency, converts the digital data into a first RZ signal and a second RZ signal complementary to the first RZ signal, shifts the first and second RZ signals with respect to each other by an integral multiple of the predetermined frequency, which is greater than one, and outputs these RZ signals. The PRZ signal generating circuit receives the first and second RZ signals, combines these signals together, and outputs a signal which is a type of a PRZ signal.
REFERENCES:
patent: 4823128 (1989-04-01), Barak
patent: 5379040 (1995-01-01), Mizomoto et al.
IEEE Journal of Solid-State Circuits, vol.-SC-22-No.3, "A CMOS Stereo 16 Bit D/A Converter for Digital Audio", Peter J. A. Naus, et al., Jun. 1987, pp. 390-394.
IEEE Journal of Solid-State Circuits, vol.-SC-26-No.12, "A Monolithic A/D and D/A Converter With Filter For Broad-Band Speech Coding", Renee G. Lerch, et al., Dec. 1991, pp. 1920-1927.
Radio Technique, Aieh publication Co. Ltd in Japan, "The Design Concept and Application Technique Of The Original 1 Bit DAC", Shinji Aoshima, Nov. 1990, pp. 152-157.
Fukunaga Toshitaka
Nagata Mitsuru
DeBoer Todd
Kabushiki Kaisha Toshiba
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