Coded data generation or conversion – Reversible analog to digital converters
Patent
1994-09-08
1995-07-11
Williams, Howard L.
Coded data generation or conversion
Reversible analog to digital converters
375219, H03M 100
Patent
active
054325137
ABSTRACT:
In a codec having a coding section A/D converting an analog signal into a digital signal, and a decoding section D/A converting a received digital signal into an analog signal, a decoding timing generating circuit (50) is provided to generate a D/A conversion timing signal (S50) on the basis of a clock signal (S30b) generated by a coding PLL circuit (30) and a reading completion signal (S61a) supplied from decoding controller (61). In synchronism with this signal (S50), a D/A converter 62 converts the digital signal Di read by the decoding controller 61, into an analog signal, and sends it to the decoding filter 63. The decoding filter (63) operates synchronism with the clock signal (S30b) generated by the coding PLL circuit (30) to filter the output of the D/A converter (62), and outputs it as the analog signal (Ao). The S/N ratio due to asynchronous noises is improved, and the size, complexity, and the power consumption of the overall circuit are reduced, so the codec is suitable for implementation in an integrated circuit.
REFERENCES:
patent: 3906488 (1975-09-01), Suarez-Gartner
patent: 4291298 (1981-09-01), Carbrey
patent: 4815099 (1989-03-01), Shimatani et al.
patent: 5148430 (1992-09-01), Kuranaga et al.
patent: 5252972 (1993-10-01), Kawbara
patent: 5278865 (1994-01-01), Amrany et al.
patent: 5315622 (1994-05-01), Abbiate et al.
"Nihon Kogyou Gijutsu Center", Keys To Design and Application of A/D and D/A Converters, The First Edition (May 31, 1985), pp. 177-180.
OKI Electric Industry Co., Ltd.
Williams Howard L.
LandOfFree
Codec does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Codec, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Codec will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-506167