H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/69
H03M 3/02 (2006.01) H03M 1/12 (2006.01)
Patent
CA 1251865
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.
506381
Amdahl Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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