Method and system for decoding a digital signal using a variable

Details Method and system for decoding a digital signal using a variable Method and system for decoding a digital signal using a variable

1983-03-15

1987-06-16

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347DA, 340347M, 324 77R, 364178, 364179, 364572, 381 31, 358138, 307353, H03K 1302

Patent

active

046739165

ABSTRACT:
In a data compression system, a digital signal comprising a series of digital samples and a sampling datum indicating the sampling interval of the digital samples are written into a read-write memory (M2). The digital samples and the associated sampling datum are read out of the memory into first and second digital-to-analog converters (DAC1, DAC2), respectively. The output of the first digital-to-analog converter is applied to a variable frequency low-pass filter (5) to remove the components having frequencies higher than a presettable frequency limit value which is variable as a function of the output of the second digital-to-analog converter so that the cut-off frequency is lower than one-half the sampling frequency to eliminate quantum noise.

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The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-84 to I-87.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 32-37.
American Institute of Aeronautics and Astronautics, Proceedings of the 1967 National Telemetering Conference held at San Francisco, Calif., 16-17-18, May 1967, pp. 50-56, New York, US; J. W. Stumpe: "Redundancy Reduction Techniques and Applications".

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