H - Electricity – 04 – R
Patent
H - Electricity
04
R
179/2, 330/87
H04R 3/04 (2006.01) H03G 7/00 (2006.01) H03G 9/02 (2006.01)
Patent
CA 1153315
ABSTRACT OF THE DISCLOSURE An improved system for compressing or expanding the dynamic range of an electrical input signal of the type which includes a variable gain device for controlling the gain of the input signal and a circuit for generating a control signal for the variable gain device including a rectifier for producing re- sponsively to the input signal a DC signal which substantially follows dynamic variations of the input signal. The improve- ment resides in the provision in the control signal generating circuit of a network of at least three signal paths having a common input terminal connected to receive the DC signal and a common output terminal connected to the variable gain device for coupling a control signal thereto, which signal paths have differing time constants and are automatically selectable as a function of the rate and amount of change in amplitude of the DC signal.
368259
Cbs Inc.
Gowling Lafleur Henderson Llp
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