초록 ▼

A two-wire line conditioning apparatus utilizing dial tone for alignment. Variable impedances are iteratively adjusted using a multitone calibration signal. The hybrid device filters out dial tone components in measuring the echo of the multitone signal during the variable impedance adjustment. The

A two-wire line conditioning apparatus utilizing dial tone for alignment. Variable impedances are iteratively adjusted using a multitone calibration signal. The hybrid device filters out dial tone components in measuring the echo of the multitone signal during the variable impedance adjustment. The level of the dial tone is measured to determine the overall gain that is to be inserted on the line by the line conditioning apparatus.

대표청구항 ▼

1. A method of performing gain alignment and hybrid balancing in a two-wire to four-wire hybrid circuit having variable impedances comprising the steps of:setting the variable impedances to initial impedance values; applying a multitone calibration signal across the hybrid in the presence of a dial

1. A method of performing gain alignment and hybrid balancing in a two-wire to four-wire hybrid circuit having variable impedances comprising the steps of:setting the variable impedances to initial impedance values; applying a multitone calibration signal across the hybrid in the presence of a dial tone signal; measuring an echo signal level from a hybrid return signal; iteratively adjusting the variable impedances until an attenuated echo signal level is attained; measuring a dial tone signal level from the hybrid return signal; and aligning the gain responsively to the dial tone signal level.