Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1987-08-07
1988-11-08
Sloyan, T. J.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
332 11D, 375 28, 375 29, 375 30, H03M 302
Patent
active
047836440
ABSTRACT:
Disclosed is a digital encoding apparatus related to CVSD techniques which provides an improved signal. The apparatus includes a comparator, comparing an analog input signal to a reconstructed analog signal and for generating the digital outputs in a manner similar to the CVSD technique. An integrating means, receives a slope control signal and the digital outputs to generate the reconstructed analog signal. The slope control signal, according to the present invention, is generated in a slope control means which includes means responsive to n digital outputs from serial clock cycles for generating an m-dimensional digital vector signal, and means responsive to the m-dimensional digital vector signal for generating the slope control signal. The m-dimensional digital vector signal is converted to an analog slope control signal by generating a scalar product of the m-dimensional digital vector signal with an m-dimensional weighting vector. The m-dimensional weighting vector is set according to a parameter to provide optimal performance of the encoding apparatus. Also the scalar product signal is filtered and logarithmically converted to provide the slope control for the integrator.
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Glasbergen, This Versatile IC Digitizes Speech, Philips Telecommunication Review, vol. 39, No. 3, 9/1981, pp. 147-154.
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Amdahl Corporation
Sloyan T. J.
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