A TELEPHONE EQUALIZATION SENSING CIRCUIT
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2001-Oct-16
Automatic gain control of telephone speech circuits as a function of the distance from the telephone to the central switching network is known as loop length equalization. Varying speech circuit gains with loop length is intended to offset signal losses within the telephone cable and "equalize" transmission levels at each and. A pro- perly designed telephone will operate on a wide range of loop lengths with only minor variations in loudness.