Adaptive-filter single-bit digital encoder and decoder and adapt

Details Adaptive-filter single-bit digital encoder and decoder and adapt Adaptive-filter single-bit digital encoder and decoder and adapt

1987-09-25

1989-05-09

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from differential codes

341 51, 341128, 341143, 341146, 341156, 332 11D, H03M 302

Patent

active

048292990

ABSTRACT:
An adaptive single-bit encoder and decoder has its adaptive function determined by dynamically dividing the message frequency band into delta-sigma and delta modulation regimes of operation. IN a practical embodiment this is accomplished by varying the corner frequency of a variable-frequency low-pass filter in a leaky integrator so that below the corner frequency the operation is that of delta-sigma modulation and above the corner frequency the operation is that of delta modulation. An adaptation control circuit removes the clock signal component from the encoded bit stream to provide an analog signal representative of bit stream information or loading for use in generating the control signal. The analog signal is peak rectified, smoothed, and (optionally) non-linearly processed to provide the control signal.

REFERENCES:
patent: 3857111 (1974-12-01), Deschenes
patent: 4493091 (1985-01-01), Gundry
patent: 4507791 (1985-03-01), Gundry
patent: 4673916 (1987-06-01), Kitamura et al.
"Companded Predictive Delta Modulation: A Low-cost Conversion Technique for Digital Recording" by Robert W. Adams(dbx Inc.), J. Audio. Eng. Soc., vol. 32, No. 9, Sep. 1984, pp. 659-672.
DataBook--Integrated Circuits for Linear Applications, RCA, 1986, pp. 375-383.
Principles of Digital Audio by Ken C. Pohlman, Howard W. Sams & Co., Inc. 1985, pp. 126-129.
Handbook for Sound Engineers by Glen Ballou, Howard W. Sams & Co., Inc. 1987, pp. 620-623.
"An Audio Broadcast System Using Delta Modulation" by Kenneth Gundry, SMPTE Journal, Nov. 1985, pp. 1185-1985.
Dialog Search from Compendex and Inspec data bases on Dialog System on Jul. 23, 1987.

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