Syllabic compander with logarithmic chain

Details Syllabic compander with logarithmic chain Syllabic compander with logarithmic chain

H - Electricity

04

R

179/2

H04R 3/04 (2006.01) H03G 7/00 (2006.01) H04B 1/64 (2006.01)

Patent

CA 1117431

ABSTRACT OF THE DISCLOSURE A syllabic compander uses logarithmic chains in both the compressor and expander. The logarithmic chains are each constructed of a logarithmic amplifier, a scaler, and an anti-logarithmic amplifier or their equivalents. The output of a logarithmic chain is equal to the input raised to a power determined by the scale factor of the scaler, A logarithmic chain is used with a multiplier and an average value circuit to implement equations of the form Image where ui is the input to the compressor or expander, u0 is the output of the compressor or expander, ? is the rms (or pseudo-rms) value of ui or u0 averaged over the time of one syllable, K is a constant, and a is the scale factor which is a function of the compression or expansion rate. Since the scale factor a may be easily adjusted, the compander permits flexibility in changing the compression and expansion rates.

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