Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1987-03-19
1989-08-29
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
341110, 341118, H03M 100
Patent
active
048621684
ABSTRACT:
Apparatus and an associated method are described for encoding an analog signal to a digital representation thereof and then decoding the same to reconstruct the original analog signal with reduced quantization noise and error. The analog signal is first adaptively pre-emphasized. A series of samples of the pre-emphasized signal are then obtained and encoded to create a series of digital representations which have a lower order resolution than the samples. The difference between each sample and its corresponding lower resolution digital representation is obtained and combined with the next sample. Decoding of the combined signals takes place in a complementary manner to create an approximate analog output signal, which is then de-emphasized in a manner complementary to the pre-emphasis to produce an analog output signal closely approximating the original analog signal. In a fully digital implementation the samples are converted to a digital format with a higher order resolution; the digital representations are obtained from the digitized samples, and the difference measurements are combined with the samples in their digital format. In a hybrid digital/analog implementation the difference is combined with the analog signal prior to sampling.
REFERENCES:
patent: 3973199 (1976-08-01), Widmer
patent: 4130729 (1978-12-01), Gagnon
patent: 4133976 (1979-01-01), Atal et al.
patent: 4385393 (1983-05-01), Chaure et al.
patent: 4430670 (1984-02-01), Netravali
patent: 4700362 (1987-10-01), Todd et al.
patent: 4746902 (1988-05-01), Tol et al.
The Engineering Staff of Analog Devices, Inc., "Analog-Digital Conversion Notes"; 1980; p. 64.
Precision Monolithics, Inc. "Linear and Conversion Products 1986/1987 Data Book".
Hoff Marc S.
Shoop Jr. William M.
LandOfFree
Audio digital/analog encoding and decoding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Audio digital/analog encoding and decoding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio digital/analog encoding and decoding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2242089