Signal expander

Details Signal expander Signal expander

H - Electricity

04

B

179/2

H04B 1/64 (2006.01) H03G 7/00 (2006.01)

Patent

CA 1164805

RCA 76,639 Abstract of the Disclosure The envelope of an input signal to be expanded is detected and applied via an adaptive filter to the gain control input of a variable gain device which expands the input signal. The adaptive filter provides improved ripple reduction and transient response characteristics and comprises a low pass filter for producing a smoothed control signal and an analog gate for coupling the greater of the smoothed control signal or a further signal to the variable gain device, the further signal being equal to the filter input signal less two predetermined constants. The gate further includes plural current paths selectively enabled for different conditions of the low pass filter input and output signals for augmenting the supply of current to the filter.

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