Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1994-12-08
1997-03-11
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
375244, H03M 300
Patent
active
056106084
ABSTRACT:
A method of accurately recording and reproducing an analog signal having a wide dynamic range with a small amount of information first samples amplitude values of an analog waveform which are then converted to a digital signal. Plural frames of data are stored in a buffer circuit. For each frame, the differences between successive values of the digital signal are extracted to form a second digital signal having an amount of shift S common to one frame, which is established and stored in a memory. In response to the amount of shift, the second digital signal is shifted toward lower bits thereof to compress the second digital signal into a third digital signal having less bits which is stored. When the difference values are small, the amount of shift is reduced to suppress errors produced during compression. When the difference values are large dynamic range is obtained, thereby coping with great signal variations without neglecting small variations in the analog signal. During reproduction, a digital signal indicating the amount of shift S and the third digital signal are read from the memory. A fourth digital signal corresponds to the differences between successive amplitude values obtained by demodulating the third digital signal according to the amount of shift S. The fifth digital signal is accumulated. Thus, a signal corresponding to the amplitude values is obtained and converted to an analog signal.
Fukutomi Yasuyuki
Yamada Kunio
Gaffin Jeffrey A.
Kost Jason L. W.
Nippon Precision Circuits Inc.
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